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-
- {*******************************************************}
- { }
- { Borland Delphi Visual Component Library }
- { }
- { Copyright (c) 1995,99 Inprise Corporation }
- { }
- {*******************************************************}
-
- unit DBGrids;
-
- {$R-}
-
- interface
-
- uses Windows, SysUtils, Messages, Classes, Controls, Forms, StdCtrls,
- Graphics, Grids, DBCtrls, Db, Menus, ImgList;
-
- type
- TColumnValue = (cvColor, cvWidth, cvFont, cvAlignment, cvReadOnly, cvTitleColor,
- cvTitleCaption, cvTitleAlignment, cvTitleFont, cvImeMode, cvImeName);
- TColumnValues = set of TColumnValue;
-
- const
- ColumnTitleValues = [cvTitleColor..cvTitleFont];
- cm_DeferLayout = WM_USER + 100;
-
- { TColumn defines internal storage for column attributes. If IsStored is
- True, values assigned to properties are stored in this object, the grid-
- or field-based default sources are not modified. Values read from
- properties are the previously assigned value, if any, or the grid- or
- field-based default values if nothing has been assigned to that property.
- This class also publishes the column attribute properties for persistent
- storage.
-
- If IsStored is True, the column does not maintain local storage of
- property values. Assignments to column properties are passed through to
- the underlying grid- or field-based default sources. }
- type
- TColumn = class;
- TCustomDBGrid = class;
-
- TColumnTitle = class(TPersistent)
- private
- FColumn: TColumn;
- FCaption: string;
- FFont: TFont;
- FColor: TColor;
- FAlignment: TAlignment;
- procedure FontChanged(Sender: TObject);
- function GetAlignment: TAlignment;
- function GetColor: TColor;
- function GetCaption: string;
- function GetFont: TFont;
- function IsAlignmentStored: Boolean;
- function IsColorStored: Boolean;
- function IsFontStored: Boolean;
- function IsCaptionStored: Boolean;
- procedure SetAlignment(Value: TAlignment);
- procedure SetColor(Value: TColor);
- procedure SetFont(Value: TFont);
- procedure SetCaption(const Value: string); virtual;
- protected
- procedure RefreshDefaultFont;
- public
- constructor Create(Column: TColumn);
- destructor Destroy; override;
- procedure Assign(Source: TPersistent); override;
- function DefaultAlignment: TAlignment;
- function DefaultColor: TColor;
- function DefaultFont: TFont;
- function DefaultCaption: string;
- procedure RestoreDefaults; virtual;
- property Column: TColumn read FColumn;
- published
- property Alignment: TAlignment read GetAlignment write SetAlignment
- stored IsAlignmentStored;
- property Caption: string read GetCaption write SetCaption stored IsCaptionStored;
- property Color: TColor read GetColor write SetColor stored IsColorStored;
- property Font: TFont read GetFont write SetFont stored IsFontStored;
- end;
-
- TColumnButtonStyle = (cbsAuto, cbsEllipsis, cbsNone);
-
- TColumn = class(TCollectionItem)
- private
- FField: TField;
- FFieldName: string;
- FColor: TColor;
- FWidth: Integer;
- FTitle: TColumnTitle;
- FFont: TFont;
- FImeMode: TImeMode;
- FImeName: TImeName;
- FPickList: TStrings;
- FPopupMenu: TPopupMenu;
- FDropDownRows: Cardinal;
- FButtonStyle: TColumnButtonStyle;
- FAlignment: TAlignment;
- FReadonly: Boolean;
- FAssignedValues: TColumnValues;
- FVisible: Boolean;
- FExpanded: Boolean;
- FStored: Boolean;
- procedure FontChanged(Sender: TObject);
- function GetAlignment: TAlignment;
- function GetColor: TColor;
- function GetExpanded: Boolean;
- function GetField: TField;
- function GetFont: TFont;
- function GetImeMode: TImeMode;
- function GetImeName: TImeName;
- function GetParentColumn: TColumn;
- function GetPickList: TStrings;
- function GetReadOnly: Boolean;
- function GetShowing: Boolean;
- function GetWidth: Integer;
- function GetVisible: Boolean;
- function IsAlignmentStored: Boolean;
- function IsColorStored: Boolean;
- function IsFontStored: Boolean;
- function IsImeModeStored: Boolean;
- function IsImeNameStored: Boolean;
- function IsReadOnlyStored: Boolean;
- function IsWidthStored: Boolean;
- procedure SetAlignment(Value: TAlignment); virtual;
- procedure SetButtonStyle(Value: TColumnButtonStyle);
- procedure SetColor(Value: TColor);
- procedure SetExpanded(Value: Boolean);
- procedure SetField(Value: TField); virtual;
- procedure SetFieldName(const Value: String);
- procedure SetFont(Value: TFont);
- procedure SetImeMode(Value: TImeMode); virtual;
- procedure SetImeName(Value: TImeName); virtual;
- procedure SetPickList(Value: TStrings);
- procedure SetPopupMenu(Value: TPopupMenu);
- procedure SetReadOnly(Value: Boolean); virtual;
- procedure SetTitle(Value: TColumnTitle);
- procedure SetWidth(Value: Integer); virtual;
- procedure SetVisible(Value: Boolean);
- function GetExpandable: Boolean;
- protected
- function CreateTitle: TColumnTitle; virtual;
- function GetGrid: TCustomDBGrid;
- function GetDisplayName: string; override;
- procedure RefreshDefaultFont;
- procedure SetIndex(Value: Integer); override;
- property IsStored: Boolean read FStored write FStored default True;
- public
- constructor Create(Collection: TCollection); override;
- destructor Destroy; override;
- procedure Assign(Source: TPersistent); override;
- function DefaultAlignment: TAlignment;
- function DefaultColor: TColor;
- function DefaultFont: TFont;
- function DefaultImeMode: TImeMode;
- function DefaultImeName: TImeName;
- function DefaultReadOnly: Boolean;
- function DefaultWidth: Integer;
- function Depth: Integer;
- procedure RestoreDefaults; virtual;
- property Grid: TCustomDBGrid read GetGrid;
- property AssignedValues: TColumnValues read FAssignedValues;
- property Expandable: Boolean read GetExpandable;
- property Field: TField read GetField write SetField;
- property ParentColumn: TColumn read GetParentColumn;
- property Showing: Boolean read GetShowing;
- published
- property Alignment: TAlignment read GetAlignment write SetAlignment
- stored IsAlignmentStored;
- property ButtonStyle: TColumnButtonStyle read FButtonStyle write SetButtonStyle
- default cbsAuto;
- property Color: TColor read GetColor write SetColor stored IsColorStored;
- property DropDownRows: Cardinal read FDropDownRows write FDropDownRows default 7;
- property Expanded: Boolean read GetExpanded write SetExpanded default True;
- property FieldName: String read FFieldName write SetFieldName;
- property Font: TFont read GetFont write SetFont stored IsFontStored;
- property ImeMode: TImeMode read GetImeMode write SetImeMode stored IsImeModeStored;
- property ImeName: TImeName read GetImeName write SetImeName stored IsImeNameStored;
- property PickList: TStrings read GetPickList write SetPickList;
- property PopupMenu: TPopupMenu read FPopupMenu write SetPopupMenu;
- property ReadOnly: Boolean read GetReadOnly write SetReadOnly
- stored IsReadOnlyStored;
- property Title: TColumnTitle read FTitle write SetTitle;
- property Width: Integer read GetWidth write SetWidth stored IsWidthStored;
- property Visible: Boolean read GetVisible write SetVisible;
- end;
-
- TColumnClass = class of TColumn;
-
- TDBGridColumnsState = (csDefault, csCustomized);
-
- TDBGridColumns = class(TCollection)
- private
- FGrid: TCustomDBGrid;
- function GetColumn(Index: Integer): TColumn;
- function InternalAdd: TColumn;
- procedure SetColumn(Index: Integer; Value: TColumn);
- procedure SetState(NewState: TDBGridColumnsState);
- function GetState: TDBGridColumnsState;
- protected
- function GetOwner: TPersistent; override;
- procedure Update(Item: TCollectionItem); override;
- public
- constructor Create(Grid: TCustomDBGrid; ColumnClass: TColumnClass);
- function Add: TColumn;
- procedure LoadFromFile(const Filename: string);
- procedure LoadFromStream(S: TStream);
- procedure RestoreDefaults;
- procedure RebuildColumns;
- procedure SaveToFile(const Filename: string);
- procedure SaveToStream(S: TStream);
- property State: TDBGridColumnsState read GetState write SetState;
- property Grid: TCustomDBGrid read FGrid;
- property Items[Index: Integer]: TColumn read GetColumn write SetColumn; default;
- end;
-
- TGridDataLink = class(TDataLink)
- private
- FGrid: TCustomDBGrid;
- FFieldCount: Integer;
- FFieldMap: array of Integer;
- FModified: Boolean;
- FInUpdateData: Boolean;
- FSparseMap: Boolean;
- function GetDefaultFields: Boolean;
- function GetFields(I: Integer): TField;
- protected
- procedure ActiveChanged; override;
- procedure BuildAggMap;
- procedure DataSetChanged; override;
- procedure DataSetScrolled(Distance: Integer); override;
- procedure FocusControl(Field: TFieldRef); override;
- procedure EditingChanged; override;
- function IsAggRow(Value: Integer): Boolean; virtual;
- procedure LayoutChanged; override;
- procedure RecordChanged(Field: TField); override;
- procedure UpdateData; override;
- function GetMappedIndex(ColIndex: Integer): Integer;
- public
- constructor Create(AGrid: TCustomDBGrid);
- destructor Destroy; override;
- function AddMapping(const FieldName: string): Boolean;
- procedure ClearMapping;
- procedure Modified;
- procedure Reset;
- property DefaultFields: Boolean read GetDefaultFields;
- property FieldCount: Integer read FFieldCount;
- property Fields[I: Integer]: TField read GetFields;
- property SparseMap: Boolean read FSparseMap write FSparseMap;
- end;
-
- TBookmarkList = class
- private
- FList: TStringList;
- FGrid: TCustomDBGrid;
- FCache: TBookmarkStr;
- FCacheIndex: Integer;
- FCacheFind: Boolean;
- FLinkActive: Boolean;
- function GetCount: Integer;
- function GetCurrentRowSelected: Boolean;
- function GetItem(Index: Integer): TBookmarkStr;
- procedure SetCurrentRowSelected(Value: Boolean);
- procedure StringsChanged(Sender: TObject);
- protected
- function CurrentRow: TBookmarkStr;
- function Compare(const Item1, Item2: TBookmarkStr): Integer;
- procedure LinkActive(Value: Boolean);
- public
- constructor Create(AGrid: TCustomDBGrid);
- destructor Destroy; override;
- procedure Clear; // free all bookmarks
- procedure Delete; // delete all selected rows from dataset
- function Find(const Item: TBookmarkStr; var Index: Integer): Boolean;
- function IndexOf(const Item: TBookmarkStr): Integer;
- function Refresh: Boolean;// drop orphaned bookmarks; True = orphans found
- property Count: Integer read GetCount;
- property CurrentRowSelected: Boolean read GetCurrentRowSelected
- write SetCurrentRowSelected;
- property Items[Index: Integer]: TBookmarkStr read GetItem; default;
- end;
-
- TDBGridOption = (dgEditing, dgAlwaysShowEditor, dgTitles, dgIndicator,
- dgColumnResize, dgColLines, dgRowLines, dgTabs, dgRowSelect,
- dgAlwaysShowSelection, dgConfirmDelete, dgCancelOnExit, dgMultiSelect);
- TDBGridOptions = set of TDBGridOption;
-
- { The DBGrid's DrawDataCell virtual method and OnDrawDataCell event are only
- called when the grid's Columns.State is csDefault. This is for compatibility
- with existing code. These routines don't provide sufficient information to
- determine which column is being drawn, so the column attributes aren't
- easily accessible in these routines. Column attributes also introduce the
- possibility that a column's field may be nil, which would break existing
- DrawDataCell code. DrawDataCell, OnDrawDataCell, and DefaultDrawDataCell
- are obsolete, retained for compatibility purposes. }
- TDrawDataCellEvent = procedure (Sender: TObject; const Rect: TRect; Field: TField;
- State: TGridDrawState) of object;
-
- { The DBGrid's DrawColumnCell virtual method and OnDrawColumnCell event are
- always called, when the grid has defined column attributes as well as when
- it is in default mode. These new routines provide the additional
- information needed to access the column attributes for the cell being
- drawn, and must support nil fields. }
-
- TDrawColumnCellEvent = procedure (Sender: TObject; const Rect: TRect;
- DataCol: Integer; Column: TColumn; State: TGridDrawState) of object;
- TDBGridClickEvent = procedure (Column: TColumn) of object;
-
- TCustomDBGrid = class(TCustomGrid)
- private
- FIndicators: TImageList;
- FTitleFont: TFont;
- FReadOnly: Boolean;
- FOriginalImeName: TImeName;
- FOriginalImeMode: TImeMode;
- FUserChange: Boolean;
- FIsESCKey: Boolean;
- FLayoutFromDataset: Boolean;
- FOptions: TDBGridOptions;
- FTitleOffset, FIndicatorOffset: Byte;
- FUpdateLock: Byte;
- FLayoutLock: Byte;
- FInColExit: Boolean;
- FDefaultDrawing: Boolean;
- FSelfChangingTitleFont: Boolean;
- FSelecting: Boolean;
- FSelRow: Integer;
- FDataLink: TGridDataLink;
- FOnColEnter: TNotifyEvent;
- FOnColExit: TNotifyEvent;
- FOnDrawDataCell: TDrawDataCellEvent;
- FOnDrawColumnCell: TDrawColumnCellEvent;
- FEditText: string;
- FColumns: TDBGridColumns;
- FVisibleColumns: TList;
- FBookmarks: TBookmarkList;
- FSelectionAnchor: TBookmarkStr;
- FOnEditButtonClick: TNotifyEvent;
- FOnColumnMoved: TMovedEvent;
- FOnCellClick: TDBGridClickEvent;
- FOnTitleClick:TDBGridClickEvent;
- FDragCol: TColumn;
- function AcquireFocus: Boolean;
- procedure DataChanged;
- procedure EditingChanged;
- function GetDataSource: TDataSource;
- function GetFieldCount: Integer;
- function GetFields(FieldIndex: Integer): TField;
- function GetSelectedField: TField;
- function GetSelectedIndex: Integer;
- procedure InternalLayout;
- procedure MoveCol(RawCol, Direction: Integer);
- function PtInExpandButton(X,Y: Integer; var MasterCol: TColumn): Boolean;
- procedure ReadColumns(Reader: TReader);
- procedure RecordChanged(Field: TField);
- procedure SetIme;
- procedure SetColumns(Value: TDBGridColumns);
- procedure SetDataSource(Value: TDataSource);
- procedure SetOptions(Value: TDBGridOptions);
- procedure SetSelectedField(Value: TField);
- procedure SetSelectedIndex(Value: Integer);
- procedure SetTitleFont(Value: TFont);
- procedure TitleFontChanged(Sender: TObject);
- procedure UpdateData;
- procedure UpdateActive;
- procedure UpdateIme;
- procedure UpdateScrollBar;
- procedure UpdateRowCount;
- procedure WriteColumns(Writer: TWriter);
- procedure CMBiDiModeChanged(var Message: TMessage); message CM_BIDIMODECHANGED;
- procedure CMExit(var Message: TMessage); message CM_EXIT;
- procedure CMFontChanged(var Message: TMessage); message CM_FONTCHANGED;
- procedure CMParentFontChanged(var Message: TMessage); message CM_PARENTFONTCHANGED;
- procedure CMDeferLayout(var Message); message cm_DeferLayout;
- procedure CMDesignHitTest(var Msg: TCMDesignHitTest); message CM_DESIGNHITTEST;
- procedure WMSetCursor(var Msg: TWMSetCursor); message WM_SETCURSOR;
- procedure WMSize(var Message: TWMSize); message WM_SIZE;
- procedure WMVScroll(var Message: TWMVScroll); message WM_VSCROLL;
- procedure WMIMEStartComp(var Message: TMessage); message WM_IME_STARTCOMPOSITION;
- procedure WMSetFocus(var Message: TWMSetFocus); message WM_SetFOCUS;
- procedure WMKillFocus(var Message: TMessage); message WM_KillFocus;
- protected
- FUpdateFields: Boolean;
- FAcquireFocus: Boolean;
- function RawToDataColumn(ACol: Integer): Integer;
- function DataToRawColumn(ACol: Integer): Integer;
- function AcquireLayoutLock: Boolean;
- procedure BeginLayout;
- procedure BeginUpdate;
- procedure CalcSizingState(X, Y: Integer; var State: TGridState;
- var Index: Longint; var SizingPos, SizingOfs: Integer;
- var FixedInfo: TGridDrawInfo); override;
- procedure CancelLayout;
- function CanEditAcceptKey(Key: Char): Boolean; override;
- function CanEditModify: Boolean; override;
- function CanEditShow: Boolean; override;
- procedure CellClick(Column: TColumn); dynamic;
- procedure ColumnMoved(FromIndex, ToIndex: Longint); override;
- function CalcTitleRect(Col: TColumn; ARow: Integer;
- var MasterCol: TColumn): TRect;
- function ColumnAtDepth(Col: TColumn; ADepth: Integer): TColumn;
- procedure ColEnter; dynamic;
- procedure ColExit; dynamic;
- procedure ColWidthsChanged; override;
- function CreateColumns: TDBGridColumns; dynamic;
- function CreateEditor: TInplaceEdit; override;
- procedure CreateWnd; override;
- procedure DeferLayout;
- procedure DefineFieldMap; virtual;
- procedure DefineProperties(Filer: TFiler); override;
- procedure DrawCell(ACol, ARow: Longint; ARect: TRect; AState: TGridDrawState); override;
- procedure DrawDataCell(const Rect: TRect; Field: TField;
- State: TGridDrawState); dynamic; { obsolete }
- procedure DrawColumnCell(const Rect: TRect; DataCol: Integer;
- Column: TColumn; State: TGridDrawState); dynamic;
- procedure EditButtonClick; dynamic;
- procedure EndLayout;
- procedure EndUpdate;
- function GetColField(DataCol: Integer): TField;
- function GetEditLimit: Integer; override;
- function GetEditMask(ACol, ARow: Longint): string; override;
- function GetEditText(ACol, ARow: Longint): string; override;
- function GetFieldValue(ACol: Integer): string;
- function HighlightCell(DataCol, DataRow: Integer; const Value: string;
- AState: TGridDrawState): Boolean; virtual;
- procedure KeyDown(var Key: Word; Shift: TShiftState); override;
- procedure KeyPress(var Key: Char); override;
- procedure InvalidateTitles;
- procedure LayoutChanged; virtual;
- procedure LinkActive(Value: Boolean); virtual;
- procedure Loaded; override;
- procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer); override;
- procedure MouseUp(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer); override;
- procedure Notification(AComponent: TComponent; Operation: TOperation); override;
- procedure Scroll(Distance: Integer); virtual;
- procedure SetColumnAttributes; virtual;
- procedure SetEditText(ACol, ARow: Longint; const Value: string); override;
- function StoreColumns: Boolean;
- procedure TimedScroll(Direction: TGridScrollDirection); override;
- procedure TitleClick(Column: TColumn); dynamic;
- procedure TopLeftChanged; override;
- function UseRightToLeftAlignmentForField(const AField: TField;
- Alignment: TAlignment): Boolean;
- function BeginColumnDrag(var Origin, Destination: Integer;
- const MousePt: TPoint): Boolean; override;
- function CheckColumnDrag(var Origin, Destination: Integer;
- const MousePt: TPoint): Boolean; override;
- function EndColumnDrag(var Origin, Destination: Integer;
- const MousePt: TPoint): Boolean; override;
- property Columns: TDBGridColumns read FColumns write SetColumns;
- property DefaultDrawing: Boolean read FDefaultDrawing write FDefaultDrawing default True;
- property DataLink: TGridDataLink read FDataLink;
- property IndicatorOffset: Byte read FIndicatorOffset;
- property LayoutLock: Byte read FLayoutLock;
- property Options: TDBGridOptions read FOptions write SetOptions
- default [dgEditing, dgTitles, dgIndicator, dgColumnResize, dgColLines,
- dgRowLines, dgTabs, dgConfirmDelete, dgCancelOnExit];
- property ParentColor default False;
- property ReadOnly: Boolean read FReadOnly write FReadOnly default False;
- property SelectedRows: TBookmarkList read FBookmarks;
- property TitleFont: TFont read FTitleFont write SetTitleFont;
- property UpdateLock: Byte read FUpdateLock;
- property OnColEnter: TNotifyEvent read FOnColEnter write FOnColEnter;
- property OnColExit: TNotifyEvent read FOnColExit write FOnColExit;
- property OnDrawDataCell: TDrawDataCellEvent read FOnDrawDataCell
- write FOnDrawDataCell; { obsolete }
- property OnDrawColumnCell: TDrawColumnCellEvent read FOnDrawColumnCell
- write FOnDrawColumnCell;
- property OnEditButtonClick: TNotifyEvent read FOnEditButtonClick
- write FOnEditButtonClick;
- property OnColumnMoved: TMovedEvent read FOnColumnMoved write FOnColumnMoved;
- property OnCellClick: TDBGridClickEvent read FOnCellClick write FOnCellClick;
- property OnTitleClick: TDBGridClickEvent read FOnTitleClick write FOnTitleClick;
- public
- constructor Create(AOwner: TComponent); override;
- destructor Destroy; override;
- procedure DefaultDrawDataCell(const Rect: TRect; Field: TField;
- State: TGridDrawState); { obsolete }
- procedure DefaultDrawColumnCell(const Rect: TRect; DataCol: Integer;
- Column: TColumn; State: TGridDrawState);
- procedure DefaultHandler(var Msg); override;
- function ExecuteAction(Action: TBasicAction): Boolean; override;
- procedure ShowPopupEditor(Column: TColumn; X: Integer = Low(Integer);
- Y: Integer = Low(Integer)); dynamic;
- function UpdateAction(Action: TBasicAction): Boolean; override;
- function ValidFieldIndex(FieldIndex: Integer): Boolean;
- property EditorMode;
- property FieldCount: Integer read GetFieldCount;
- property Fields[FieldIndex: Integer]: TField read GetFields;
- property SelectedField: TField read GetSelectedField write SetSelectedField;
- property SelectedIndex: Integer read GetSelectedIndex write SetSelectedIndex;
- property DataSource: TDataSource read GetDataSource write SetDataSource;
- end;
-
- TDBGrid = class(TCustomDBGrid)
- public
- property Canvas;
- property SelectedRows;
- published
- property Align;
- property Anchors;
- property BiDiMode;
- property BorderStyle;
- property Color;
- property Columns stored False; //StoreColumns;
- property Constraints;
- property Ctl3D;
- property DataSource;
- property DefaultDrawing;
- property DragCursor;
- property DragKind;
- property DragMode;
- property Enabled;
- property FixedColor;
- property Font;
- property ImeMode;
- property ImeName;
- property Options;
- property ParentBiDiMode;
- property ParentColor;
- property ParentCtl3D;
- property ParentFont;
- property ParentShowHint;
- property PopupMenu;
- property ReadOnly;
- property ShowHint;
- property TabOrder;
- property TabStop;
- property TitleFont;
- property Visible;
- property OnCellClick;
- property OnColEnter;
- property OnColExit;
- property OnColumnMoved;
- property OnDrawDataCell; { obsolete }
- property OnDrawColumnCell;
- property OnDblClick;
- property OnDragDrop;
- property OnDragOver;
- property OnEditButtonClick;
- property OnEndDock;
- property OnEndDrag;
- property OnEnter;
- property OnExit;
- property OnKeyDown;
- property OnKeyPress;
- property OnKeyUp;
- property OnMouseDown;
- property OnMouseMove;
- property OnMouseUp;
- property OnStartDock;
- property OnStartDrag;
- property OnTitleClick;
- end;
-
- const
- IndicatorWidth = 11;
-
- implementation
-
- uses Math, DBConsts, Dialogs;
-
- {$R DBGRIDS.RES}
-
- const
- bmArrow = 'DBGARROW';
- bmEdit = 'DBEDIT';
- bmInsert = 'DBINSERT';
- bmMultiDot = 'DBMULTIDOT';
- bmMultiArrow = 'DBMULTIARROW';
-
- MaxMapSize = (MaxInt div 2) div SizeOf(Integer); { 250 million }
-
- { Error reporting }
-
- procedure RaiseGridError(const S: string);
- begin
- raise EInvalidGridOperation.Create(S);
- end;
-
- procedure KillMessage(Wnd: HWnd; Msg: Integer);
- // Delete the requested message from the queue, but throw back
- // any WM_QUIT msgs that PeekMessage may also return
- var
- M: TMsg;
- begin
- M.Message := 0;
- if PeekMessage(M, Wnd, Msg, Msg, pm_Remove) and (M.Message = WM_QUIT) then
- PostQuitMessage(M.wparam);
- end;
-
- { TDBGridInplaceEdit }
-
- { TDBGridInplaceEdit adds support for a button on the in-place editor,
- which can be used to drop down a table-based lookup list, a stringlist-based
- pick list, or (if button style is esEllipsis) fire the grid event
- OnEditButtonClick. }
-
- type
- TEditStyle = (esSimple, esEllipsis, esPickList, esDataList);
- TPopupListbox = class;
-
- TDBGridInplaceEdit = class(TInplaceEdit)
- private
- FButtonWidth: Integer;
- FDataList: TDBLookupListBox;
- FPickList: TPopupListbox;
- FActiveList: TWinControl;
- FLookupSource: TDatasource;
- FEditStyle: TEditStyle;
- FListVisible: Boolean;
- FTracking: Boolean;
- FPressed: Boolean;
- procedure ListMouseUp(Sender: TObject; Button: TMouseButton;
- Shift: TShiftState; X, Y: Integer);
- procedure SetEditStyle(Value: TEditStyle);
- procedure StopTracking;
- procedure TrackButton(X,Y: Integer);
- procedure CMCancelMode(var Message: TCMCancelMode); message CM_CancelMode;
- procedure WMCancelMode(var Message: TMessage); message WM_CancelMode;
- procedure WMKillFocus(var Message: TMessage); message WM_KillFocus;
- procedure WMLButtonDblClk(var Message: TWMLButtonDblClk); message wm_LButtonDblClk;
- procedure WMPaint(var Message: TWMPaint); message wm_Paint;
- procedure WMSetCursor(var Message: TWMSetCursor); message WM_SetCursor;
- function OverButton(const P: TPoint): Boolean;
- function ButtonRect: TRect;
- protected
- procedure BoundsChanged; override;
- procedure CloseUp(Accept: Boolean);
- procedure DoDropDownKeys(var Key: Word; Shift: TShiftState);
- procedure DropDown;
- procedure KeyDown(var Key: Word; Shift: TShiftState); override;
- procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer); override;
- procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
- procedure MouseUp(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer); override;
- procedure PaintWindow(DC: HDC); override;
- procedure UpdateContents; override;
- procedure WndProc(var Message: TMessage); override;
- property EditStyle: TEditStyle read FEditStyle write SetEditStyle;
- property ActiveList: TWinControl read FActiveList write FActiveList;
- property DataList: TDBLookupListBox read FDataList;
- property PickList: TPopupListbox read FPickList;
- public
- constructor Create(Owner: TComponent); override;
- end;
-
- { TPopupListbox }
-
- TPopupListbox = class(TCustomListbox)
- private
- FSearchText: String;
- FSearchTickCount: Longint;
- protected
- procedure CreateParams(var Params: TCreateParams); override;
- procedure CreateWnd; override;
- procedure KeyPress(var Key: Char); override;
- procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
- end;
-
- procedure TPopupListBox.CreateParams(var Params: TCreateParams);
- begin
- inherited CreateParams(Params);
- with Params do
- begin
- Style := Style or WS_BORDER;
- ExStyle := WS_EX_TOOLWINDOW or WS_EX_TOPMOST;
- AddBiDiModeExStyle(ExStyle);
- WindowClass.Style := CS_SAVEBITS;
- end;
- end;
-
- procedure TPopupListbox.CreateWnd;
- begin
- inherited CreateWnd;
- Windows.SetParent(Handle, 0);
- CallWindowProc(DefWndProc, Handle, wm_SetFocus, 0, 0);
- end;
-
- procedure TPopupListbox.Keypress(var Key: Char);
- var
- TickCount: Integer;
- begin
- case Key of
- #8, #27: FSearchText := '';
- #32..#255:
- begin
- TickCount := GetTickCount;
- if TickCount - FSearchTickCount > 2000 then FSearchText := '';
- FSearchTickCount := TickCount;
- if Length(FSearchText) < 32 then FSearchText := FSearchText + Key;
- SendMessage(Handle, LB_SelectString, WORD(-1), Longint(PChar(FSearchText)));
- Key := #0;
- end;
- end;
- inherited Keypress(Key);
- end;
-
- procedure TPopupListbox.MouseUp(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer);
- begin
- inherited MouseUp(Button, Shift, X, Y);
- TDBGridInPlaceEdit(Owner).CloseUp((X >= 0) and (Y >= 0) and
- (X < Width) and (Y < Height));
- end;
-
-
- constructor TDBGridInplaceEdit.Create(Owner: TComponent);
- begin
- inherited Create(Owner);
- FLookupSource := TDataSource.Create(Self);
- FButtonWidth := GetSystemMetrics(SM_CXVSCROLL);
- FEditStyle := esSimple;
- end;
-
- procedure TDBGridInplaceEdit.BoundsChanged;
- var
- R: TRect;
- begin
- SetRect(R, 2, 2, Width - 2, Height);
- if FEditStyle <> esSimple then
- if not TCustomDBGrid(Owner).UseRightToLeftAlignment then
- Dec(R.Right, FButtonWidth)
- else
- Inc(R.Left, FButtonWidth - 2);
- SendMessage(Handle, EM_SETRECTNP, 0, LongInt(@R));
- SendMessage(Handle, EM_SCROLLCARET, 0, 0);
- if SysLocale.FarEast then
- SetImeCompositionWindow(Font, R.Left, R.Top);
- end;
-
- procedure TDBGridInplaceEdit.CloseUp(Accept: Boolean);
- var
- MasterField: TField;
- ListValue: Variant;
- begin
- if FListVisible then
- begin
- if GetCapture <> 0 then SendMessage(GetCapture, WM_CANCELMODE, 0, 0);
- if FActiveList = FDataList then
- ListValue := FDataList.KeyValue
- else
- if FPickList.ItemIndex <> -1 then
- ListValue := FPickList.Items[FPicklist.ItemIndex];
- SetWindowPos(FActiveList.Handle, 0, 0, 0, 0, 0, SWP_NOZORDER or
- SWP_NOMOVE or SWP_NOSIZE or SWP_NOACTIVATE or SWP_HIDEWINDOW);
- FListVisible := False;
- if Assigned(FDataList) then
- FDataList.ListSource := nil;
- FLookupSource.Dataset := nil;
- Invalidate;
- if Accept then
- if FActiveList = FDataList then
- with TCustomDBGrid(Grid), Columns[SelectedIndex].Field do
- begin
- MasterField := DataSet.FieldByName(KeyFields);
- if MasterField.CanModify and FDataLink.Edit then
- MasterField.Value := ListValue;
- end
- else
- if (not VarIsNull(ListValue)) and EditCanModify then
- with TCustomDBGrid(Grid), Columns[SelectedIndex].Field do
- Text := ListValue;
- end;
- end;
-
- procedure TDBGridInplaceEdit.DoDropDownKeys(var Key: Word; Shift: TShiftState);
- begin
- case Key of
- VK_UP, VK_DOWN:
- if ssAlt in Shift then
- begin
- if FListVisible then CloseUp(True) else DropDown;
- Key := 0;
- end;
- VK_RETURN, VK_ESCAPE:
- if FListVisible and not (ssAlt in Shift) then
- begin
- CloseUp(Key = VK_RETURN);
- Key := 0;
- end;
- end;
- end;
-
- procedure TDBGridInplaceEdit.DropDown;
- var
- P: TPoint;
- I,J,Y: Integer;
- Column: TColumn;
- begin
- if not FListVisible and Assigned(FActiveList) then
- begin
- FActiveList.Width := Width;
- with TCustomDBGrid(Grid) do
- Column := Columns[SelectedIndex];
- if FActiveList = FDataList then
- with Column.Field do
- begin
- FDataList.Color := Color;
- FDataList.Font := Font;
- FDataList.RowCount := Column.DropDownRows;
- FLookupSource.DataSet := LookupDataSet;
- FDataList.KeyField := LookupKeyFields;
- FDataList.ListField := LookupResultField;
- FDataList.ListSource := FLookupSource;
- FDataList.KeyValue := DataSet.FieldByName(KeyFields).Value;
- { J := Column.DefaultWidth;
- if J > FDataList.ClientWidth then
- FDataList.ClientWidth := J;
- } end
- else
- begin
- FPickList.Color := Color;
- FPickList.Font := Font;
- FPickList.Items := Column.Picklist;
- if FPickList.Items.Count >= Integer(Column.DropDownRows) then
- FPickList.Height := Integer(Column.DropDownRows) * FPickList.ItemHeight + 4
- else
- FPickList.Height := FPickList.Items.Count * FPickList.ItemHeight + 4;
- if Column.Field.IsNull then
- FPickList.ItemIndex := -1
- else
- FPickList.ItemIndex := FPickList.Items.IndexOf(Column.Field.Text);
- J := FPickList.ClientWidth;
- for I := 0 to FPickList.Items.Count - 1 do
- begin
- Y := FPickList.Canvas.TextWidth(FPickList.Items[I]);
- if Y > J then J := Y;
- end;
- FPickList.ClientWidth := J;
- end;
- P := Parent.ClientToScreen(Point(Left, Top));
- Y := P.Y + Height;
- if Y + FActiveList.Height > Screen.Height then Y := P.Y - FActiveList.Height;
- SetWindowPos(FActiveList.Handle, HWND_TOP, P.X, Y, 0, 0,
- SWP_NOSIZE or SWP_NOACTIVATE or SWP_SHOWWINDOW);
- FListVisible := True;
- Invalidate;
- Windows.SetFocus(Handle);
- end;
- end;
-
- type
- TWinControlCracker = class(TWinControl) end;
-
- procedure TDBGridInplaceEdit.KeyDown(var Key: Word; Shift: TShiftState);
- begin
- if (EditStyle = esEllipsis) and (Key = VK_RETURN) and (Shift = [ssCtrl]) then
- begin
- TCustomDBGrid(Grid).EditButtonClick;
- KillMessage(Handle, WM_CHAR);
- end
- else
- inherited KeyDown(Key, Shift);
- end;
-
- procedure TDBGridInplaceEdit.ListMouseUp(Sender: TObject; Button: TMouseButton;
- Shift: TShiftState; X, Y: Integer);
- begin
- if Button = mbLeft then
- CloseUp(PtInRect(FActiveList.ClientRect, Point(X, Y)));
- end;
-
- procedure TDBGridInplaceEdit.MouseDown(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer);
- begin
- if (Button = mbLeft) and (FEditStyle <> esSimple) and
- OverButton(Point(X,Y)) then
- begin
- if FListVisible then
- CloseUp(False)
- else
- begin
- MouseCapture := True;
- FTracking := True;
- TrackButton(X, Y);
- if Assigned(FActiveList) then
- DropDown;
- end;
- end;
- inherited MouseDown(Button, Shift, X, Y);
- end;
-
- procedure TDBGridInplaceEdit.MouseMove(Shift: TShiftState; X, Y: Integer);
- var
- ListPos: TPoint;
- MousePos: TSmallPoint;
- begin
- if FTracking then
- begin
- TrackButton(X, Y);
- if FListVisible then
- begin
- ListPos := FActiveList.ScreenToClient(ClientToScreen(Point(X, Y)));
- if PtInRect(FActiveList.ClientRect, ListPos) then
- begin
- StopTracking;
- MousePos := PointToSmallPoint(ListPos);
- SendMessage(FActiveList.Handle, WM_LBUTTONDOWN, 0, Integer(MousePos));
- Exit;
- end;
- end;
- end;
- inherited MouseMove(Shift, X, Y);
- end;
-
- procedure TDBGridInplaceEdit.MouseUp(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer);
- var
- WasPressed: Boolean;
- begin
- WasPressed := FPressed;
- StopTracking;
- if (Button = mbLeft) and (FEditStyle = esEllipsis) and WasPressed then
- TCustomDBGrid(Grid).EditButtonClick;
- inherited MouseUp(Button, Shift, X, Y);
- end;
-
- procedure TDBGridInplaceEdit.PaintWindow(DC: HDC);
- var
- R: TRect;
- Flags: Integer;
- W, X, Y: Integer;
- begin
- if FEditStyle <> esSimple then
- begin
- R := ButtonRect;
- Flags := 0;
- if FEditStyle in [esDataList, esPickList] then
- begin
- if FActiveList = nil then
- Flags := DFCS_INACTIVE
- else if FPressed then
- Flags := DFCS_FLAT or DFCS_PUSHED;
- DrawFrameControl(DC, R, DFC_SCROLL, Flags or DFCS_SCROLLCOMBOBOX);
- end
- else { esEllipsis }
- begin
- if FPressed then Flags := BF_FLAT;
- DrawEdge(DC, R, EDGE_RAISED, BF_RECT or BF_MIDDLE or Flags);
- X := R.Left + ((R.Right - R.Left) shr 1) - 1 + Ord(FPressed);
- Y := R.Top + ((R.Bottom - R.Top) shr 1) - 1 + Ord(FPressed);
- W := FButtonWidth shr 3;
- if W = 0 then W := 1;
- PatBlt(DC, X, Y, W, W, BLACKNESS);
- PatBlt(DC, X - (W * 2), Y, W, W, BLACKNESS);
- PatBlt(DC, X + (W * 2), Y, W, W, BLACKNESS);
- end;
- ExcludeClipRect(DC, R.Left, R.Top, R.Right, R.Bottom);
- end;
- inherited PaintWindow(DC);
- end;
-
- procedure TDBGridInplaceEdit.SetEditStyle(Value: TEditStyle);
- begin
- if Value = FEditStyle then Exit;
- FEditStyle := Value;
- case Value of
- esPickList:
- begin
- if FPickList = nil then
- begin
- FPickList := TPopupListbox.Create(Self);
- FPickList.Visible := False;
- FPickList.Parent := Self;
- FPickList.OnMouseUp := ListMouseUp;
- FPickList.IntegralHeight := True;
- FPickList.ItemHeight := 11;
- end;
- FActiveList := FPickList;
- end;
- esDataList:
- begin
- if FDataList = nil then
- begin
- FDataList := TPopupDataList.Create(Self);
- FDataList.Visible := False;
- FDataList.Parent := Self;
- FDataList.OnMouseUp := ListMouseUp;
- end;
- FActiveList := FDataList;
- end;
- else { cbsNone, cbsEllipsis, or read only field }
- FActiveList := nil;
- end;
- with TCustomDBGrid(Grid) do
- Self.ReadOnly := Columns[SelectedIndex].ReadOnly;
- Repaint;
- end;
-
- procedure TDBGridInplaceEdit.StopTracking;
- begin
- if FTracking then
- begin
- TrackButton(-1, -1);
- FTracking := False;
- MouseCapture := False;
- end;
- end;
-
- procedure TDBGridInplaceEdit.TrackButton(X,Y: Integer);
- var
- NewState: Boolean;
- R: TRect;
- begin
- R := ButtonRect;
- NewState := PtInRect(R, Point(X, Y));
- if FPressed <> NewState then
- begin
- FPressed := NewState;
- InvalidateRect(Handle, @R, False);
- end;
- end;
-
- procedure TDBGridInplaceEdit.UpdateContents;
- var
- Column: TColumn;
- NewStyle: TEditStyle;
- MasterField: TField;
- begin
- with TCustomDBGrid(Grid) do
- Column := Columns[SelectedIndex];
- NewStyle := esSimple;
- case Column.ButtonStyle of
- cbsEllipsis: NewStyle := esEllipsis;
- cbsAuto:
- if Assigned(Column.Field) then
- with Column.Field do
- begin
- { Show the dropdown button only if the field is editable }
- if FieldKind = fkLookup then
- begin
- MasterField := Dataset.FieldByName(KeyFields);
- { Column.DefaultReadonly will always be True for a lookup field.
- Test if Column.ReadOnly has been assigned a value of True }
- if Assigned(MasterField) and MasterField.CanModify and
- not ((cvReadOnly in Column.AssignedValues) and Column.ReadOnly) then
- with TCustomDBGrid(Grid) do
- if not ReadOnly and DataLink.Active and not Datalink.ReadOnly then
- NewStyle := esDataList
- end
- else
- if Assigned(Column.Picklist) and (Column.PickList.Count > 0) and
- not Column.Readonly then
- NewStyle := esPickList
- else if DataType in [ftDataset, ftReference] then
- NewStyle := esEllipsis;
- end;
- end;
- EditStyle := NewStyle;
- inherited UpdateContents;
- Font.Assign(Column.Font);
- ImeMode := Column.ImeMode;
- ImeName := Column.ImeName;
- end;
-
- procedure TDBGridInplaceEdit.CMCancelMode(var Message: TCMCancelMode);
- begin
- if (Message.Sender <> Self) and (Message.Sender <> FActiveList) then
- CloseUp(False);
- end;
-
- procedure TDBGridInplaceEdit.WMCancelMode(var Message: TMessage);
- begin
- StopTracking;
- inherited;
- end;
-
- procedure TDBGridInplaceEdit.WMKillFocus(var Message: TMessage);
- begin
- if not SysLocale.FarEast then inherited
- else
- begin
- ImeName := Screen.DefaultIme;
- ImeMode := imDontCare;
- inherited;
- if HWND(Message.WParam) <> TCustomDBGrid(Grid).Handle then
- ActivateKeyboardLayout(Screen.DefaultKbLayout, KLF_ACTIVATE);
- end;
- CloseUp(False);
- end;
-
- function TDBGridInplaceEdit.ButtonRect: TRect;
- begin
- if not TCustomDBGrid(Owner).UseRightToLeftAlignment then
- Result := Rect(Width - FButtonWidth, 0, Width, Height)
- else
- Result := Rect(0, 0, FButtonWidth, Height);
- end;
-
- function TDBGridInplaceEdit.OverButton(const P: TPoint): Boolean;
- begin
- Result := PtInRect(ButtonRect, P);
- end;
-
- procedure TDBGridInplaceEdit.WMLButtonDblClk(var Message: TWMLButtonDblClk);
- begin
- with Message do
- if (FEditStyle <> esSimple) and OverButton(Point(XPos, YPos)) then
- Exit;
- inherited;
- end;
-
- procedure TDBGridInplaceEdit.WMPaint(var Message: TWMPaint);
- begin
- PaintHandler(Message);
- end;
-
- procedure TDBGridInplaceEdit.WMSetCursor(var Message: TWMSetCursor);
- var
- P: TPoint;
- begin
- GetCursorPos(P);
- P := ScreenToClient(P);
- if (FEditStyle <> esSimple) and OverButton(P) then
- Windows.SetCursor(LoadCursor(0, idc_Arrow))
- else
- inherited;
- end;
-
- procedure TDBGridInplaceEdit.WndProc(var Message: TMessage);
- begin
- case Message.Msg of
- wm_KeyDown, wm_SysKeyDown, wm_Char:
- if EditStyle in [esPickList, esDataList] then
- with TWMKey(Message) do
- begin
- DoDropDownKeys(CharCode, KeyDataToShiftState(KeyData));
- if (CharCode <> 0) and FListVisible then
- begin
- with TMessage(Message) do
- SendMessage(FActiveList.Handle, Msg, WParam, LParam);
- Exit;
- end;
- end
- end;
- inherited;
- end;
-
-
- { TGridDataLink }
-
- type
- TIntArray = array[0..MaxMapSize] of Integer;
- PIntArray = ^TIntArray;
-
- constructor TGridDataLink.Create(AGrid: TCustomDBGrid);
- begin
- inherited Create;
- FGrid := AGrid;
- VisualControl := True;
- end;
-
- destructor TGridDataLink.Destroy;
- begin
- ClearMapping;
- inherited Destroy;
- end;
-
- function TGridDataLink.GetDefaultFields: Boolean;
- var
- I: Integer;
- begin
- Result := True;
- if DataSet <> nil then Result := DataSet.DefaultFields;
- if Result and SparseMap then
- for I := 0 to FFieldCount-1 do
- if FFieldMap[I] < 0 then
- begin
- Result := False;
- Exit;
- end;
- end;
-
- function TGridDataLink.GetFields(I: Integer): TField;
- begin
- if (0 <= I) and (I < FFieldCount) and (FFieldMap[I] >= 0) then
- Result := DataSet.FieldList[FFieldMap[I]]
- else
- Result := nil;
- end;
-
- function TGridDataLink.AddMapping(const FieldName: string): Boolean;
- var
- Field: TField;
- NewSize: Integer;
- begin
- Result := True;
- if FFieldCount >= MaxMapSize then RaiseGridError(STooManyColumns);
- if SparseMap then
- Field := DataSet.FindField(FieldName)
- else
- Field := DataSet.FieldByName(FieldName);
-
- if FFieldCount = Length(FFieldMap) then
- begin
- NewSize := Length(FFieldMap);
- if NewSize = 0 then
- NewSize := 8
- else
- Inc(NewSize, NewSize);
- if (NewSize < FFieldCount) then
- NewSize := FFieldCount + 1;
- if (NewSize > MaxMapSize) then
- NewSize := MaxMapSize;
- SetLength(FFieldMap, NewSize);
- end;
- if Assigned(Field) then
- begin
- FFieldMap[FFieldCount] := Dataset.FieldList.IndexOfObject(Field);
- Field.FreeNotification(FGrid);
- end
- else
- FFieldMap[FFieldCount] := -1;
- Inc(FFieldCount);
- end;
-
- procedure TGridDataLink.ActiveChanged;
- begin
- FGrid.LinkActive(Active);
- FModified := False;
- end;
-
- procedure TGridDataLink.ClearMapping;
- begin
- FFieldMap := nil;
- FFieldCount := 0;
- end;
-
- procedure TGridDataLink.Modified;
- begin
- FModified := True;
- end;
-
- procedure TGridDataLink.DataSetChanged;
- begin
- FGrid.DataChanged;
- FModified := False;
- end;
-
- procedure TGridDataLink.DataSetScrolled(Distance: Integer);
- begin
- FGrid.Scroll(Distance);
- end;
-
- procedure TGridDataLink.LayoutChanged;
- var
- SaveState: Boolean;
- begin
- { FLayoutFromDataset determines whether default column width is forced to
- be at least wide enough for the column title. }
- SaveState := FGrid.FLayoutFromDataset;
- FGrid.FLayoutFromDataset := True;
- try
- FGrid.LayoutChanged;
- finally
- FGrid.FLayoutFromDataset := SaveState;
- end;
- inherited LayoutChanged;
- end;
-
- procedure TGridDataLink.FocusControl(Field: TFieldRef);
- begin
- if Assigned(Field) and Assigned(Field^) then
- begin
- FGrid.SelectedField := Field^;
- if (FGrid.SelectedField = Field^) and FGrid.AcquireFocus then
- begin
- Field^ := nil;
- FGrid.ShowEditor;
- end;
- end;
- end;
-
- procedure TGridDataLink.EditingChanged;
- begin
- FGrid.EditingChanged;
- end;
-
- procedure TGridDataLink.RecordChanged(Field: TField);
- begin
- FGrid.RecordChanged(Field);
- FModified := False;
- end;
-
- procedure TGridDataLink.UpdateData;
- begin
- FInUpdateData := True;
- try
- if FModified then FGrid.UpdateData;
- FModified := False;
- finally
- FInUpdateData := False;
- end;
- end;
-
- function TGridDataLink.GetMappedIndex(ColIndex: Integer): Integer;
- begin
- if (0 <= ColIndex) and (ColIndex < FFieldCount) then
- Result := FFieldMap[ColIndex]
- else
- Result := -1;
- end;
-
- procedure TGridDataLink.Reset;
- begin
- if FModified then RecordChanged(nil) else Dataset.Cancel;
- end;
-
- function TGridDataLink.IsAggRow(Value: Integer): Boolean;
- begin
- Result := False;
- end;
-
- procedure TGridDataLink.BuildAggMap;
- begin
- end;
-
- { TColumnTitle }
- constructor TColumnTitle.Create(Column: TColumn);
- begin
- inherited Create;
- FColumn := Column;
- FFont := TFont.Create;
- FFont.Assign(DefaultFont);
- FFont.OnChange := FontChanged;
- end;
-
- destructor TColumnTitle.Destroy;
- begin
- FFont.Free;
- inherited Destroy;
- end;
-
- procedure TColumnTitle.Assign(Source: TPersistent);
- begin
- if Source is TColumnTitle then
- begin
- if cvTitleAlignment in TColumnTitle(Source).FColumn.FAssignedValues then
- Alignment := TColumnTitle(Source).Alignment;
- if cvTitleColor in TColumnTitle(Source).FColumn.FAssignedValues then
- Color := TColumnTitle(Source).Color;
- if cvTitleCaption in TColumnTitle(Source).FColumn.FAssignedValues then
- Caption := TColumnTitle(Source).Caption;
- if cvTitleFont in TColumnTitle(Source).FColumn.FAssignedValues then
- Font := TColumnTitle(Source).Font;
- end
- else
- inherited Assign(Source);
- end;
-
- function TColumnTitle.DefaultAlignment: TAlignment;
- begin
- Result := taLeftJustify;
- end;
-
- function TColumnTitle.DefaultColor: TColor;
- var
- Grid: TCustomDBGrid;
- begin
- Grid := FColumn.GetGrid;
- if Assigned(Grid) then
- Result := Grid.FixedColor
- else
- Result := clBtnFace;
- end;
-
- function TColumnTitle.DefaultFont: TFont;
- var
- Grid: TCustomDBGrid;
- begin
- Grid := FColumn.GetGrid;
- if Assigned(Grid) then
- Result := Grid.TitleFont
- else
- Result := FColumn.Font;
- end;
-
- function TColumnTitle.DefaultCaption: string;
- var
- Field: TField;
- begin
- Field := FColumn.Field;
- if Assigned(Field) then
- Result := Field.DisplayName
- else
- Result := FColumn.FieldName;
- end;
-
- procedure TColumnTitle.FontChanged(Sender: TObject);
- begin
- Include(FColumn.FAssignedValues, cvTitleFont);
- FColumn.Changed(True);
- end;
-
- function TColumnTitle.GetAlignment: TAlignment;
- begin
- if cvTitleAlignment in FColumn.FAssignedValues then
- Result := FAlignment
- else
- Result := DefaultAlignment;
- end;
-
- function TColumnTitle.GetColor: TColor;
- begin
- if cvTitleColor in FColumn.FAssignedValues then
- Result := FColor
- else
- Result := DefaultColor;
- end;
-
- function TColumnTitle.GetCaption: string;
- begin
- if cvTitleCaption in FColumn.FAssignedValues then
- Result := FCaption
- else
- Result := DefaultCaption;
- end;
-
- function TColumnTitle.GetFont: TFont;
- var
- Save: TNotifyEvent;
- Def: TFont;
- begin
- if not (cvTitleFont in FColumn.FAssignedValues) then
- begin
- Def := DefaultFont;
- if (FFont.Handle <> Def.Handle) or (FFont.Color <> Def.Color) then
- begin
- Save := FFont.OnChange;
- FFont.OnChange := nil;
- FFont.Assign(DefaultFont);
- FFont.OnChange := Save;
- end;
- end;
- Result := FFont;
- end;
-
- function TColumnTitle.IsAlignmentStored: Boolean;
- begin
- Result := (cvTitleAlignment in FColumn.FAssignedValues) and
- (FAlignment <> DefaultAlignment);
- end;
-
- function TColumnTitle.IsColorStored: Boolean;
- begin
- Result := (cvTitleColor in FColumn.FAssignedValues) and
- (FColor <> DefaultColor);
- end;
-
- function TColumnTitle.IsFontStored: Boolean;
- begin
- Result := (cvTitleFont in FColumn.FAssignedValues);
- end;
-
- function TColumnTitle.IsCaptionStored: Boolean;
- begin
- Result := (cvTitleCaption in FColumn.FAssignedValues) and
- (FCaption <> DefaultCaption);
- end;
-
- procedure TColumnTitle.RefreshDefaultFont;
- var
- Save: TNotifyEvent;
- begin
- if (cvTitleFont in FColumn.FAssignedValues) then Exit;
- Save := FFont.OnChange;
- FFont.OnChange := nil;
- try
- FFont.Assign(DefaultFont);
- finally
- FFont.OnChange := Save;
- end;
- end;
-
- procedure TColumnTitle.RestoreDefaults;
- var
- FontAssigned: Boolean;
- begin
- FontAssigned := cvTitleFont in FColumn.FAssignedValues;
- FColumn.FAssignedValues := FColumn.FAssignedValues - ColumnTitleValues;
- FCaption := '';
- RefreshDefaultFont;
- { If font was assigned, changing it back to default may affect grid title
- height, and title height changes require layout and redraw of the grid. }
- FColumn.Changed(FontAssigned);
- end;
-
- procedure TColumnTitle.SetAlignment(Value: TAlignment);
- begin
- if (cvTitleAlignment in FColumn.FAssignedValues) and (Value = FAlignment) then Exit;
- FAlignment := Value;
- Include(FColumn.FAssignedValues, cvTitleAlignment);
- FColumn.Changed(False);
- end;
-
- procedure TColumnTitle.SetColor(Value: TColor);
- begin
- if (cvTitleColor in FColumn.FAssignedValues) and (Value = FColor) then Exit;
- FColor := Value;
- Include(FColumn.FAssignedValues, cvTitleColor);
- FColumn.Changed(False);
- end;
-
- procedure TColumnTitle.SetFont(Value: TFont);
- begin
- FFont.Assign(Value);
- end;
-
- procedure TColumnTitle.SetCaption(const Value: string);
- var
- Grid: TCustomDBGrid;
- begin
- if Column.IsStored then
- begin
- if (cvTitleCaption in FColumn.FAssignedValues) and (Value = FCaption) then Exit;
- FCaption := Value;
- Include(Column.FAssignedValues, cvTitleCaption);
- Column.Changed(False);
- end
- else
- begin
- Grid := Column.GetGrid;
- if Assigned(Grid) and (Grid.Datalink.Active) and Assigned(Column.Field) then
- Column.Field.DisplayLabel := Value;
- end;
- end;
-
-
- { TColumn }
-
- constructor TColumn.Create(Collection: TCollection);
- var
- Grid: TCustomDBGrid;
- begin
- Grid := nil;
- if Assigned(Collection) and (Collection is TDBGridColumns) then
- Grid := TDBGridColumns(Collection).Grid;
- if Assigned(Grid) then Grid.BeginLayout;
- try
- inherited Create(Collection);
- FDropDownRows := 7;
- FButtonStyle := cbsAuto;
- FFont := TFont.Create;
- FFont.Assign(DefaultFont);
- FFont.OnChange := FontChanged;
- FImeMode := imDontCare;
- FImeName := Screen.DefaultIme;
- FTitle := CreateTitle;
- FVisible := True;
- FExpanded := True;
- FStored := True;
- finally
- if Assigned(Grid) then Grid.EndLayout;
- end;
- end;
-
- destructor TColumn.Destroy;
- begin
- FTitle.Free;
- FFont.Free;
- FPickList.Free;
- inherited Destroy;
- end;
-
- procedure TColumn.Assign(Source: TPersistent);
- begin
- if Source is TColumn then
- begin
- if Assigned(Collection) then Collection.BeginUpdate;
- try
- RestoreDefaults;
- FieldName := TColumn(Source).FieldName;
- if cvColor in TColumn(Source).AssignedValues then
- Color := TColumn(Source).Color;
- if cvWidth in TColumn(Source).AssignedValues then
- Width := TColumn(Source).Width;
- if cvFont in TColumn(Source).AssignedValues then
- Font := TColumn(Source).Font;
- if cvImeMode in TColumn(Source).AssignedValues then
- ImeMode := TColumn(Source).ImeMode;
- if cvImeName in TColumn(Source).AssignedValues then
- ImeName := TColumn(Source).ImeName;
- if cvAlignment in TColumn(Source).AssignedValues then
- Alignment := TColumn(Source).Alignment;
- if cvReadOnly in TColumn(Source).AssignedValues then
- ReadOnly := TColumn(Source).ReadOnly;
- Title := TColumn(Source).Title;
- DropDownRows := TColumn(Source).DropDownRows;
- ButtonStyle := TColumn(Source).ButtonStyle;
- PickList := TColumn(Source).PickList;
- PopupMenu := TColumn(Source).PopupMenu;
- FVisible := TColumn(Source).FVisible;
- FExpanded := TColumn(Source).FExpanded;
- finally
- if Assigned(Collection) then Collection.EndUpdate;
- end;
- end
- else
- inherited Assign(Source);
- end;
-
- function TColumn.CreateTitle: TColumnTitle;
- begin
- Result := TColumnTitle.Create(Self);
- end;
-
- function TColumn.DefaultAlignment: TAlignment;
- begin
- if Assigned(Field) then
- Result := FField.Alignment
- else
- Result := taLeftJustify;
- end;
-
- function TColumn.DefaultColor: TColor;
- var
- Grid: TCustomDBGrid;
- begin
- Grid := GetGrid;
- if Assigned(Grid) then
- Result := Grid.Color
- else
- Result := clWindow;
- end;
-
- function TColumn.DefaultFont: TFont;
- var
- Grid: TCustomDBGrid;
- begin
- Grid := GetGrid;
- if Assigned(Grid) then
- Result := Grid.Font
- else
- Result := FFont;
- end;
-
- function TColumn.DefaultImeMode: TImeMode;
- var
- Grid: TCustomDBGrid;
- begin
- Grid := GetGrid;
- if Assigned(Grid) then
- Result := Grid.ImeMode
- else
- Result := FImeMode;
- end;
-
- function TColumn.DefaultImeName: TImeName;
- var
- Grid: TCustomDBGrid;
- begin
- Grid := GetGrid;
- if Assigned(Grid) then
- Result := Grid.ImeName
- else
- Result := FImeName;
- end;
-
- function TColumn.DefaultReadOnly: Boolean;
- var
- Grid: TCustomDBGrid;
- begin
- Grid := GetGrid;
- Result := (Assigned(Grid) and Grid.ReadOnly) or
- (Assigned(Field) and FField.ReadOnly);
- end;
-
- function TColumn.DefaultWidth: Integer;
- var
- W: Integer;
- RestoreCanvas: Boolean;
- TM: TTextMetric;
- begin
- if GetGrid = nil then
- begin
- Result := 64;
- Exit;
- end;
- with GetGrid do
- begin
- if Assigned(Field) then
- begin
- RestoreCanvas := not HandleAllocated;
- if RestoreCanvas then
- Canvas.Handle := GetDC(0);
- try
- Canvas.Font := Self.Font;
- GetTextMetrics(Canvas.Handle, TM);
- Result := Field.DisplayWidth * (Canvas.TextWidth('0') - TM.tmOverhang)
- + TM.tmOverhang + 4;
- if dgTitles in Options then
- begin
- Canvas.Font := Title.Font;
- W := Canvas.TextWidth(Title.Caption) + 4;
- if Result < W then
- Result := W;
- end;
- finally
- if RestoreCanvas then
- begin
- ReleaseDC(0,Canvas.Handle);
- Canvas.Handle := 0;
- end;
- end;
- end
- else
- Result := DefaultColWidth;
- end;
- end;
-
- procedure TColumn.FontChanged;
- begin
- Include(FAssignedValues, cvFont);
- Title.RefreshDefaultFont;
- Changed(False);
- end;
-
- function TColumn.GetAlignment: TAlignment;
- begin
- if cvAlignment in FAssignedValues then
- Result := FAlignment
- else
- Result := DefaultAlignment;
- end;
-
- function TColumn.GetColor: TColor;
- begin
- if cvColor in FAssignedValues then
- Result := FColor
- else
- Result := DefaultColor;
- end;
-
- function TColumn.GetExpanded: Boolean;
- begin
- Result := FExpanded and Expandable;
- end;
-
- function TColumn.GetField: TField;
- var
- Grid: TCustomDBGrid;
- begin { Returns Nil if FieldName can't be found in dataset }
- Grid := GetGrid;
- if (FField = nil) and (Length(FFieldName) > 0) and Assigned(Grid) and
- Assigned(Grid.DataLink.DataSet) then
- with Grid.Datalink.Dataset do
- if Active or (not DefaultFields) then
- SetField(FindField(FieldName));
- Result := FField;
- end;
-
- function TColumn.GetFont: TFont;
- var
- Save: TNotifyEvent;
- begin
- if not (cvFont in FAssignedValues) and (FFont.Handle <> DefaultFont.Handle) then
- begin
- Save := FFont.OnChange;
- FFont.OnChange := nil;
- FFont.Assign(DefaultFont);
- FFont.OnChange := Save;
- end;
- Result := FFont;
- end;
-
- function TColumn.GetGrid: TCustomDBGrid;
- begin
- if Assigned(Collection) and (Collection is TDBGridColumns) then
- Result := TDBGridColumns(Collection).Grid
- else
- Result := nil;
- end;
-
- function TColumn.GetDisplayName: string;
- begin
- Result := FFieldName;
- if Result = '' then Result := inherited GetDisplayName;
- end;
-
- function TColumn.GetImeMode: TImeMode;
- begin
- if cvImeMode in FAssignedValues then
- Result := FImeMode
- else
- Result := DefaultImeMode;
- end;
-
- function TColumn.GetImeName: TImeName;
- begin
- if cvImeName in FAssignedValues then
- Result := FImeName
- else
- Result := DefaultImeName;
- end;
-
- function TColumn.GetParentColumn: TColumn;
- var
- Col: TColumn;
- Fld: TField;
- I: Integer;
- begin
- Result := nil;
- Fld := Field;
- if (Fld <> nil) and (Fld.ParentField <> nil) and (Collection <> nil) then
- for I := Index - 1 downto 0 do
- begin
- Col := TColumn(Collection.Items[I]);
- if Fld.ParentField = Col.Field then
- begin
- Result := Col;
- Exit;
- end;
- end;
- end;
-
- function TColumn.GetPickList: TStrings;
- begin
- if FPickList = nil then
- FPickList := TStringList.Create;
- Result := FPickList;
- end;
-
- function TColumn.GetReadOnly: Boolean;
- begin
- if cvReadOnly in FAssignedValues then
- Result := FReadOnly
- else
- Result := DefaultReadOnly;
- end;
-
- function TColumn.GetShowing: Boolean;
- var
- Col: TColumn;
- begin
- Result := not Expanded and Visible;
- if Result then
- begin
- Col := Self;
- repeat
- Col := Col.ParentColumn;
- until (Col = nil) or not Col.Expanded;
- Result := Col = nil;
- end;
- end;
-
- function TColumn.GetVisible: Boolean;
- var
- Col: TColumn;
- begin
- Result := FVisible;
- if Result then
- begin
- Col := ParentColumn;
- Result := Result and ((Col = nil) or Col.Visible);
- end;
- end;
-
- function TColumn.GetWidth: Integer;
- begin
- if not Showing then
- Result := -1
- else if cvWidth in FAssignedValues then
- Result := FWidth
- else
- Result := DefaultWidth;
- end;
-
- function TColumn.IsAlignmentStored: Boolean;
- begin
- Result := (cvAlignment in FAssignedValues) and (FAlignment <> DefaultAlignment);
- end;
-
- function TColumn.IsColorStored: Boolean;
- begin
- Result := (cvColor in FAssignedValues) and (FColor <> DefaultColor);
- end;
-
- function TColumn.IsFontStored: Boolean;
- begin
- Result := (cvFont in FAssignedValues);
- end;
-
- function TColumn.IsImeModeStored: Boolean;
- begin
- Result := (cvImeMode in FAssignedValues) and (FImeMode <> DefaultImeMode);
- end;
-
- function TColumn.IsImeNameStored: Boolean;
- begin
- Result := (cvImeName in FAssignedValues) and (FImeName <> DefaultImeName);
- end;
-
- function TColumn.IsReadOnlyStored: Boolean;
- begin
- Result := (cvReadOnly in FAssignedValues) and (FReadOnly <> DefaultReadOnly);
- end;
-
- function TColumn.IsWidthStored: Boolean;
- begin
- Result := (cvWidth in FAssignedValues) and (FWidth <> DefaultWidth);
- end;
-
- procedure TColumn.RefreshDefaultFont;
- var
- Save: TNotifyEvent;
- begin
- if cvFont in FAssignedValues then Exit;
- Save := FFont.OnChange;
- FFont.OnChange := nil;
- try
- FFont.Assign(DefaultFont);
- finally
- FFont.OnChange := Save;
- end;
- end;
-
- procedure TColumn.RestoreDefaults;
- var
- FontAssigned: Boolean;
- begin
- FontAssigned := cvFont in FAssignedValues;
- FTitle.RestoreDefaults;
- FAssignedValues := [];
- RefreshDefaultFont;
- FPickList.Free;
- FPickList := nil;
- ButtonStyle := cbsAuto;
- Changed(FontAssigned);
- end;
-
- procedure TColumn.SetAlignment(Value: TAlignment);
- var
- Grid: TCustomDBGrid;
- begin
- if IsStored then
- begin
- if (cvAlignment in FAssignedValues) and (Value = FAlignment) then Exit;
- FAlignment := Value;
- Include(FAssignedValues, cvAlignment);
- Changed(False);
- end
- else
- begin
- Grid := GetGrid;
- if Assigned(Grid) and (Grid.Datalink.Active) and Assigned(Field) then
- Field.Alignment := Value;
- end;
- end;
-
- procedure TColumn.SetButtonStyle(Value: TColumnButtonStyle);
- begin
- if Value = FButtonStyle then Exit;
- FButtonStyle := Value;
- Changed(False);
- end;
-
- procedure TColumn.SetColor(Value: TColor);
- begin
- if (cvColor in FAssignedValues) and (Value = FColor) then Exit;
- FColor := Value;
- Include(FAssignedValues, cvColor);
- Changed(False);
- end;
-
- procedure TColumn.SetField(Value: TField);
- begin
- if FField = Value then Exit;
- if Assigned(FField) and
- (GetGrid <> nil) then
- FField.RemoveFreeNotification(GetGrid);
- FField := Value;
- if Assigned(Value) then
- begin
- if GetGrid <> nil then
- FField.FreeNotification(GetGrid);
- FFieldName := Value.FullName;
- end;
- if not IsStored then
- begin
- if Value = nil then
- FFieldName := '';
- RestoreDefaults;
- end;
- Changed(False);
- end;
-
- procedure TColumn.SetFieldName(const Value: String);
- var
- AField: TField;
- Grid: TCustomDBGrid;
- begin
- AField := nil;
- Grid := GetGrid;
- if Assigned(Grid) and Assigned(Grid.DataLink.DataSet) and
- not (csLoading in Grid.ComponentState) and (Length(Value) > 0) then
- AField := Grid.DataLink.DataSet.FindField(Value); { no exceptions }
- FFieldName := Value;
- SetField(AField);
- Changed(False);
- end;
-
- procedure TColumn.SetFont(Value: TFont);
- begin
- FFont.Assign(Value);
- Include(FAssignedValues, cvFont);
- Changed(False);
- end;
-
- procedure TColumn.SetImeMode(Value: TImeMode);
- begin
- if (cvImeMode in FAssignedValues) or (Value <> DefaultImeMode) then
- begin
- FImeMode := Value;
- Include(FAssignedValues, cvImeMode);
- end;
- Changed(False);
- end;
-
- procedure TColumn.SetImeName(Value: TImeName);
- begin
- if (cvImeName in FAssignedValues) or (Value <> DefaultImeName) then
- begin
- FImeName := Value;
- Include(FAssignedValues, cvImeName);
- end;
- Changed(False);
- end;
-
- procedure TColumn.SetIndex(Value: Integer);
- var
- Grid: TCustomDBGrid;
- Fld: TField;
- I, OldIndex: Integer;
- Col: TColumn;
- begin
- OldIndex := Index;
- Grid := GetGrid;
-
- if IsStored then
- begin
- Grid.BeginLayout;
- try
- I := OldIndex + 1; // move child columns along with parent
- while (I < Collection.Count) and (TColumn(Collection.Items[I]).ParentColumn = Self) do
- Inc(I);
- Dec(I);
- if OldIndex > Value then // column moving left
- begin
- while I > OldIndex do
- begin
- Collection.Items[I].Index := Value;
- Inc(OldIndex);
- end;
- inherited SetIndex(Value);
- end
- else
- begin
- inherited SetIndex(Value);
- while I > OldIndex do
- begin
- Collection.Items[OldIndex].Index := Value;
- Dec(I);
- end;
- end;
- finally
- Grid.EndLayout;
- end;
- end
- else
- begin
- if (Grid <> nil) and Grid.Datalink.Active then
- begin
- if Grid.AcquireLayoutLock then
- try
- Col := Grid.ColumnAtDepth(Grid.Columns[Value], Depth);
- if (Col <> nil) then
- begin
- Fld := Col.Field;
- if Assigned(Fld) then
- Field.Index := Fld.Index;
- end;
- finally
- Grid.EndLayout;
- end;
- end;
- inherited SetIndex(Value);
- end;
- end;
-
- procedure TColumn.SetPickList(Value: TStrings);
- begin
- if Value = nil then
- begin
- FPickList.Free;
- FPickList := nil;
- Exit;
- end;
- PickList.Assign(Value);
- end;
-
- procedure TColumn.SetPopupMenu(Value: TPopupMenu);
- begin
- FPopupMenu := Value;
- if Value <> nil then Value.FreeNotification(GetGrid);
- end;
-
- procedure TColumn.SetReadOnly(Value: Boolean);
- var
- Grid: TCustomDBGrid;
- begin
- Grid := GetGrid;
- if not IsStored and Assigned(Grid) and Grid.Datalink.Active and Assigned(Field) then
- Field.ReadOnly := Value
- else
- begin
- if (cvReadOnly in FAssignedValues) and (Value = FReadOnly) then Exit;
- FReadOnly := Value;
- Include(FAssignedValues, cvReadOnly);
- Changed(False);
- end;
- end;
-
- procedure TColumn.SetTitle(Value: TColumnTitle);
- begin
- FTitle.Assign(Value);
- end;
-
- procedure TColumn.SetWidth(Value: Integer);
- var
- Grid: TCustomDBGrid;
- TM: TTextMetric;
- DoSetWidth: Boolean;
- begin
- DoSetWidth := IsStored;
- if not DoSetWidth then
- begin
- Grid := GetGrid;
- if Assigned(Grid) then
- begin
- if Grid.HandleAllocated and Assigned(Field) and Grid.FUpdateFields then
- with Grid do
- begin
- Canvas.Font := Self.Font;
- GetTextMetrics(Canvas.Handle, TM);
- Field.DisplayWidth := (Value + (TM.tmAveCharWidth div 2) - TM.tmOverhang - 3)
- div TM.tmAveCharWidth;
- end;
- if (not Grid.FLayoutFromDataset) or (cvWidth in FAssignedValues) then
- DoSetWidth := True;
- end
- else
- DoSetWidth := True;
- end;
- if DoSetWidth then
- begin
- if ((cvWidth in FAssignedValues) or (Value <> DefaultWidth))
- and (Value <> -1) then
- begin
- FWidth := Value;
- Include(FAssignedValues, cvWidth);
- end;
- Changed(False);
- end;
- end;
-
- procedure TColumn.SetVisible(Value: Boolean);
- begin
- if Value <> FVisible then
- begin
- FVisible := Value;
- Changed(True);
- end;
- end;
-
- procedure TColumn.SetExpanded(Value: Boolean);
- const
- Direction: array [Boolean] of ShortInt = (-1,1);
- var
- Grid: TCustomDBGrid;
- WasShowing: Boolean;
- begin
- if Value <> FExpanded then
- begin
- Grid := GetGrid;
- WasShowing := (Grid <> nil) and Grid.Columns[Grid.SelectedIndex].Showing;
- FExpanded := Value;
- Changed(True);
- if (Grid <> nil) and WasShowing then
- begin
- if not Grid.Columns[Grid.SelectedIndex].Showing then
- // The selected cell was hidden by this expand operation
- // Select 1st child (next col = 1) when parent is expanded
- // Select child's parent (prev col = -1) when parent is collapsed
- Grid.MoveCol(Grid.Col, Direction[FExpanded]);
- end;
- end;
- end;
-
- function TColumn.Depth: Integer;
- var
- Col: TColumn;
- begin
- Result := 0;
- Col := ParentColumn;
- if Col <> nil then Result := Col.Depth + 1;
- end;
-
- function TColumn.GetExpandable: Boolean;
- var
- Fld: TField;
- begin
- Fld := Field;
- Result := (Fld <> nil) and (Fld.DataType in [ftADT, ftArray]);
- end;
-
- { TDBGridColumns }
-
- constructor TDBGridColumns.Create(Grid: TCustomDBGrid; ColumnClass: TColumnClass);
- begin
- inherited Create(ColumnClass);
- FGrid := Grid;
- end;
-
- function TDBGridColumns.Add: TColumn;
- begin
- Result := TColumn(inherited Add);
- end;
-
- function TDBGridColumns.GetColumn(Index: Integer): TColumn;
- begin
- Result := TColumn(inherited Items[Index]);
- end;
-
- function TDBGridColumns.GetOwner: TPersistent;
- begin
- Result := FGrid;
- end;
-
- procedure TDBGridColumns.LoadFromFile(const Filename: string);
- var
- S: TFileStream;
- begin
- S := TFileStream.Create(Filename, fmOpenRead);
- try
- LoadFromStream(S);
- finally
- S.Free;
- end;
- end;
-
- type
- TColumnsWrapper = class(TComponent)
- private
- FColumns: TDBGridColumns;
- published
- property Columns: TDBGridColumns read FColumns write FColumns;
- end;
-
- procedure TDBGridColumns.LoadFromStream(S: TStream);
- var
- Wrapper: TColumnsWrapper;
- begin
- Wrapper := TColumnsWrapper.Create(nil);
- try
- Wrapper.Columns := FGrid.CreateColumns;
- S.ReadComponent(Wrapper);
- Assign(Wrapper.Columns);
- finally
- Wrapper.Columns.Free;
- Wrapper.Free;
- end;
- end;
-
- procedure TDBGridColumns.RestoreDefaults;
- var
- I: Integer;
- begin
- BeginUpdate;
- try
- for I := 0 to Count-1 do
- Items[I].RestoreDefaults;
- finally
- EndUpdate;
- end;
- end;
-
- procedure TDBGridColumns.RebuildColumns;
-
- procedure AddFields(Fields: TFields; Depth: Integer);
- var
- I: Integer;
- begin
- Inc(Depth);
- for I := 0 to Fields.Count-1 do
- begin
- Add.FieldName := Fields[I].FullName;
- if Fields[I].DataType in [ftADT, ftArray] then
- AddFields((Fields[I] as TObjectField).Fields, Depth);
- end;
- end;
-
- begin
- if Assigned(FGrid) and Assigned(FGrid.DataSource) and
- Assigned(FGrid.Datasource.Dataset) then
- begin
- FGrid.BeginLayout;
- try
- Clear;
- AddFields(FGrid.Datasource.Dataset.Fields, 0);
- finally
- FGrid.EndLayout;
- end
- end
- else
- Clear;
- end;
-
- procedure TDBGridColumns.SaveToFile(const Filename: string);
- var
- S: TStream;
- begin
- S := TFileStream.Create(Filename, fmCreate);
- try
- SaveToStream(S);
- finally
- S.Free;
- end;
- end;
-
- procedure TDBGridColumns.SaveToStream(S: TStream);
- var
- Wrapper: TColumnsWrapper;
- begin
- Wrapper := TColumnsWrapper.Create(nil);
- try
- Wrapper.Columns := Self;
- S.WriteComponent(Wrapper);
- finally
- Wrapper.Free;
- end;
- end;
-
- procedure TDBGridColumns.SetColumn(Index: Integer; Value: TColumn);
- begin
- Items[Index].Assign(Value);
- end;
-
- procedure TDBGridColumns.SetState(NewState: TDBGridColumnsState);
- begin
- if NewState = State then Exit;
- if NewState = csDefault then
- Clear
- else
- RebuildColumns;
- end;
-
- procedure TDBGridColumns.Update(Item: TCollectionItem);
- var
- Raw: Integer;
- begin
- if (FGrid = nil) or (csLoading in FGrid.ComponentState) then Exit;
- if Item = nil then
- begin
- FGrid.LayoutChanged;
- end
- else
- begin
- Raw := FGrid.DataToRawColumn(Item.Index);
- FGrid.InvalidateCol(Raw);
- FGrid.ColWidths[Raw] := TColumn(Item).Width;
- end;
- end;
-
- function TDBGridColumns.InternalAdd: TColumn;
- begin
- Result := Add;
- Result.IsStored := False;
- end;
-
- function TDBGridColumns.GetState: TDBGridColumnsState;
- begin
- Result := TDBGridColumnsState((Count > 0) and Items[0].IsStored);
- end;
-
- { TBookmarkList }
-
- constructor TBookmarkList.Create(AGrid: TCustomDBGrid);
- begin
- inherited Create;
- FList := TStringList.Create;
- FList.OnChange := StringsChanged;
- FGrid := AGrid;
- end;
-
- destructor TBookmarkList.Destroy;
- begin
- Clear;
- FList.Free;
- inherited Destroy;
- end;
-
- procedure TBookmarkList.Clear;
- begin
- if FList.Count = 0 then Exit;
- FList.Clear;
- FGrid.Invalidate;
- end;
-
- function TBookmarkList.Compare(const Item1, Item2: TBookmarkStr): Integer;
- begin
- with FGrid.Datalink.Datasource.Dataset do
- Result := CompareBookmarks(TBookmark(Item1), TBookmark(Item2));
- end;
-
- function TBookmarkList.CurrentRow: TBookmarkStr;
- begin
- if not FLinkActive then RaiseGridError(sDataSetClosed);
- Result := FGrid.Datalink.Datasource.Dataset.Bookmark;
- end;
-
- function TBookmarkList.GetCurrentRowSelected: Boolean;
- var
- Index: Integer;
- begin
- Result := Find(CurrentRow, Index);
- end;
-
- function TBookmarkList.Find(const Item: TBookmarkStr; var Index: Integer): Boolean;
- var
- L, H, I, C: Integer;
- begin
- if (Item = FCache) and (FCacheIndex >= 0) then
- begin
- Index := FCacheIndex;
- Result := FCacheFind;
- Exit;
- end;
- Result := False;
- L := 0;
- H := FList.Count - 1;
- while L <= H do
- begin
- I := (L + H) shr 1;
- C := Compare(FList[I], Item);
- if C < 0 then L := I + 1 else
- begin
- H := I - 1;
- if C = 0 then
- begin
- Result := True;
- L := I;
- end;
- end;
- end;
- Index := L;
- FCache := Item;
- FCacheIndex := Index;
- FCacheFind := Result;
- end;
-
- function TBookmarkList.GetCount: Integer;
- begin
- Result := FList.Count;
- end;
-
- function TBookmarkList.GetItem(Index: Integer): TBookmarkStr;
- begin
- Result := FList[Index];
- end;
-
- function TBookmarkList.IndexOf(const Item: TBookmarkStr): Integer;
- begin
- if not Find(Item, Result) then
- Result := -1;
- end;
-
- procedure TBookmarkList.LinkActive(Value: Boolean);
- begin
- Clear;
- FLinkActive := Value;
- end;
-
- procedure TBookmarkList.Delete;
- var
- I: Integer;
- begin
- with FGrid.Datalink.Datasource.Dataset do
- begin
- DisableControls;
- try
- for I := FList.Count-1 downto 0 do
- begin
- Bookmark := FList[I];
- Delete;
- FList.Delete(I);
- end;
- finally
- EnableControls;
- end;
- end;
- end;
-
- function TBookmarkList.Refresh: Boolean;
- var
- I: Integer;
- begin
- Result := False;
- with FGrid.DataLink.Datasource.Dataset do
- try
- CheckBrowseMode;
- for I := FList.Count - 1 downto 0 do
- if not BookmarkValid(TBookmark(FList[I])) then
- begin
- Result := True;
- FList.Delete(I);
- end;
- finally
- UpdateCursorPos;
- if Result then FGrid.Invalidate;
- end;
- end;
-
- procedure TBookmarkList.SetCurrentRowSelected(Value: Boolean);
- var
- Index: Integer;
- Current: TBookmarkStr;
- begin
- Current := CurrentRow;
- if (Length(Current) = 0) or (Find(Current, Index) = Value) then Exit;
- if Value then
- FList.Insert(Index, Current)
- else
- FList.Delete(Index);
- FGrid.InvalidateRow(FGrid.Row);
- end;
-
- procedure TBookmarkList.StringsChanged(Sender: TObject);
- begin
- FCache := '';
- FCacheIndex := -1;
- end;
-
-
- { TCustomDBGrid }
-
- var
- DrawBitmap: TBitmap;
- UserCount: Integer;
-
- procedure UsesBitmap;
- begin
- if UserCount = 0 then
- DrawBitmap := TBitmap.Create;
- Inc(UserCount);
- end;
-
- procedure ReleaseBitmap;
- begin
- Dec(UserCount);
- if UserCount = 0 then DrawBitmap.Free;
- end;
-
- procedure WriteText(ACanvas: TCanvas; ARect: TRect; DX, DY: Integer;
- const Text: string; Alignment: TAlignment; ARightToLeft: Boolean);
- const
- AlignFlags : array [TAlignment] of Integer =
- ( DT_LEFT or DT_WORDBREAK or DT_EXPANDTABS or DT_NOPREFIX,
- DT_RIGHT or DT_WORDBREAK or DT_EXPANDTABS or DT_NOPREFIX,
- DT_CENTER or DT_WORDBREAK or DT_EXPANDTABS or DT_NOPREFIX );
- RTL: array [Boolean] of Integer = (0, DT_RTLREADING);
- var
- B, R: TRect;
- Hold, Left: Integer;
- I: TColorRef;
- begin
- I := ColorToRGB(ACanvas.Brush.Color);
- if GetNearestColor(ACanvas.Handle, I) = I then
- begin { Use ExtTextOut for solid colors }
- { In BiDi, because we changed the window origin, the text that does not
- change alignment, actually gets its alignment changed. }
- if (ACanvas.CanvasOrientation = coRightToLeft) and (not ARightToLeft) then
- ChangeBiDiModeAlignment(Alignment);
- case Alignment of
- taLeftJustify:
- Left := ARect.Left + DX;
- taRightJustify:
- Left := ARect.Right - ACanvas.TextWidth(Text) - 3;
- else { taCenter }
- Left := ARect.Left + (ARect.Right - ARect.Left) shr 1
- - (ACanvas.TextWidth(Text) shr 1);
- end;
- ACanvas.TextRect(ARect, Left, ARect.Top + DY, Text);
- end
- else begin { Use FillRect and Drawtext for dithered colors }
- DrawBitmap.Canvas.Lock;
- try
- with DrawBitmap, ARect do { Use offscreen bitmap to eliminate flicker and }
- begin { brush origin tics in painting / scrolling. }
- Width := Max(Width, Right - Left);
- Height := Max(Height, Bottom - Top);
- R := Rect(DX, DY, Right - Left - 1, Bottom - Top - 1);
- B := Rect(0, 0, Right - Left, Bottom - Top);
- end;
- with DrawBitmap.Canvas do
- begin
- Font := ACanvas.Font;
- Font.Color := ACanvas.Font.Color;
- Brush := ACanvas.Brush;
- Brush.Style := bsSolid;
- FillRect(B);
- SetBkMode(Handle, TRANSPARENT);
- if (ACanvas.CanvasOrientation = coRightToLeft) then
- ChangeBiDiModeAlignment(Alignment);
- DrawText(Handle, PChar(Text), Length(Text), R,
- AlignFlags[Alignment] or RTL[ARightToLeft]);
- end;
- if (ACanvas.CanvasOrientation = coRightToLeft) then
- begin
- Hold := ARect.Left;
- ARect.Left := ARect.Right;
- ARect.Right := Hold;
- end;
- ACanvas.CopyRect(ARect, DrawBitmap.Canvas, B);
- finally
- DrawBitmap.Canvas.Unlock;
- end;
- end;
- end;
-
- constructor TCustomDBGrid.Create(AOwner: TComponent);
- var
- Bmp: TBitmap;
- begin
- inherited Create(AOwner);
- inherited DefaultDrawing := False;
- FAcquireFocus := True;
- Bmp := TBitmap.Create;
- try
- Bmp.LoadFromResourceName(HInstance, bmArrow);
- FIndicators := TImageList.CreateSize(Bmp.Width, Bmp.Height);
- FIndicators.AddMasked(Bmp, clWhite);
- Bmp.LoadFromResourceName(HInstance, bmEdit);
- FIndicators.AddMasked(Bmp, clWhite);
- Bmp.LoadFromResourceName(HInstance, bmInsert);
- FIndicators.AddMasked(Bmp, clWhite);
- Bmp.LoadFromResourceName(HInstance, bmMultiDot);
- FIndicators.AddMasked(Bmp, clWhite);
- Bmp.LoadFromResourceName(HInstance, bmMultiArrow);
- FIndicators.AddMasked(Bmp, clWhite);
- finally
- Bmp.Free;
- end;
- FTitleOffset := 1;
- FIndicatorOffset := 1;
- FUpdateFields := True;
- FOptions := [dgEditing, dgTitles, dgIndicator, dgColumnResize,
- dgColLines, dgRowLines, dgTabs, dgConfirmDelete, dgCancelOnExit];
- if SysLocale.PriLangID = LANG_KOREAN then
- Include(FOptions, dgAlwaysShowEditor);
- DesignOptionsBoost := [goColSizing];
- VirtualView := True;
- UsesBitmap;
- ScrollBars := ssHorizontal;
- inherited Options := [goFixedHorzLine, goFixedVertLine, goHorzLine,
- goVertLine, goColSizing, goColMoving, goTabs, goEditing];
- FColumns := CreateColumns;
- FVisibleColumns := TList.Create;
- inherited RowCount := 2;
- inherited ColCount := 2;
- FDataLink := TGridDataLink.Create(Self);
- Color := clWindow;
- ParentColor := False;
- FTitleFont := TFont.Create;
- FTitleFont.OnChange := TitleFontChanged;
- FSaveCellExtents := False;
- FUserChange := True;
- FDefaultDrawing := True;
- FBookmarks := TBookmarkList.Create(Self);
- HideEditor;
- end;
-
- destructor TCustomDBGrid.Destroy;
- begin
- FColumns.Free;
- FColumns := nil;
- FVisibleColumns.Free;
- FVisibleColumns := nil;
- FDataLink.Free;
- FDataLink := nil;
- FIndicators.Free;
- FTitleFont.Free;
- FTitleFont := nil;
- FBookmarks.Free;
- FBookmarks := nil;
- inherited Destroy;
- ReleaseBitmap;
- end;
-
- function TCustomDBGrid.AcquireFocus: Boolean;
- begin
- Result := True;
- if FAcquireFocus and CanFocus and not (csDesigning in ComponentState) then
- begin
- SetFocus;
- Result := Focused or (InplaceEditor <> nil) and InplaceEditor.Focused;
- end;
- end;
-
- function TCustomDBGrid.RawToDataColumn(ACol: Integer): Integer;
- begin
- Result := ACol - FIndicatorOffset;
- end;
-
- function TCustomDBGrid.DataToRawColumn(ACol: Integer): Integer;
- begin
- Result := ACol + FIndicatorOffset;
- end;
-
- function TCustomDBGrid.AcquireLayoutLock: Boolean;
- begin
- Result := (FUpdateLock = 0) and (FLayoutLock = 0);
- if Result then BeginLayout;
- end;
-
- procedure TCustomDBGrid.BeginLayout;
- begin
- BeginUpdate;
- if FLayoutLock = 0 then Columns.BeginUpdate;
- Inc(FLayoutLock);
- end;
-
- procedure TCustomDBGrid.BeginUpdate;
- begin
- Inc(FUpdateLock);
- end;
-
- procedure TCustomDBGrid.CancelLayout;
- begin
- if FLayoutLock > 0 then
- begin
- if FLayoutLock = 1 then
- Columns.EndUpdate;
- Dec(FLayoutLock);
- EndUpdate;
- end;
- end;
-
- function TCustomDBGrid.CanEditAcceptKey(Key: Char): Boolean;
- begin
- with Columns[SelectedIndex] do
- Result := FDatalink.Active and Assigned(Field) and Field.IsValidChar(Key);
- end;
-
- function TCustomDBGrid.CanEditModify: Boolean;
- begin
- Result := False;
- if not ReadOnly and FDatalink.Active and not FDatalink.Readonly then
- with Columns[SelectedIndex] do
- if (not ReadOnly) and Assigned(Field) and Field.CanModify
- and (not (Field.DataType in ftNonTextTypes) or Assigned(Field.OnSetText)) then
- begin
- FDatalink.Edit;
- Result := FDatalink.Editing;
- if Result then FDatalink.Modified;
- end;
- end;
-
- function TCustomDBGrid.CanEditShow: Boolean;
- begin
- Result := (LayoutLock = 0) and inherited CanEditShow;
- end;
-
- procedure TCustomDBGrid.CellClick(Column: TColumn);
- begin
- if Assigned(FOnCellClick) then FOnCellClick(Column);
- end;
-
- procedure TCustomDBGrid.ColEnter;
- begin
- UpdateIme;
- if Assigned(FOnColEnter) then FOnColEnter(Self);
- end;
-
- procedure TCustomDBGrid.ColExit;
- begin
- if Assigned(FOnColExit) then FOnColExit(Self);
- end;
-
- procedure TCustomDBGrid.ColumnMoved(FromIndex, ToIndex: Longint);
- begin
- FromIndex := RawToDataColumn(FromIndex);
- ToIndex := RawToDataColumn(ToIndex);
- Columns[FromIndex].Index := ToIndex;
- if Assigned(FOnColumnMoved) then FOnColumnMoved(Self, FromIndex, ToIndex);
- end;
-
- procedure TCustomDBGrid.ColWidthsChanged;
- var
- I: Integer;
- begin
- inherited ColWidthsChanged;
- if (FDatalink.Active or (FColumns.State = csCustomized)) and
- AcquireLayoutLock then
- try
- for I := FIndicatorOffset to ColCount - 1 do
- FColumns[I - FIndicatorOffset].Width := ColWidths[I];
- finally
- EndLayout;
- end;
- end;
-
- function TCustomDBGrid.CreateColumns: TDBGridColumns;
- begin
- Result := TDBGridColumns.Create(Self, TColumn);
- end;
-
- function TCustomDBGrid.CreateEditor: TInplaceEdit;
- begin
- Result := TDBGridInplaceEdit.Create(Self);
- end;
-
- procedure TCustomDBGrid.CreateWnd;
- begin
- BeginUpdate; { prevent updates in WMSize message that follows WMCreate }
- try
- inherited CreateWnd;
- finally
- EndUpdate;
- end;
- UpdateRowCount;
- UpdateActive;
- UpdateScrollBar;
- FOriginalImeName := ImeName;
- FOriginalImeMode := ImeMode;
- end;
-
- procedure TCustomDBGrid.DataChanged;
- begin
- if not HandleAllocated then Exit;
- UpdateRowCount;
- UpdateScrollBar;
- UpdateActive;
- InvalidateEditor;
- ValidateRect(Handle, nil);
- Invalidate;
- end;
-
- procedure TCustomDBGrid.DefaultHandler(var Msg);
- var
- P: TPopupMenu;
- Cell: TGridCoord;
- begin
- inherited DefaultHandler(Msg);
- if TMessage(Msg).Msg = wm_RButtonUp then
- with TWMRButtonUp(Msg) do
- begin
- Cell := MouseCoord(XPos, YPos);
- if (Cell.X < FIndicatorOffset) or (Cell.Y < 0) then Exit;
- P := Columns[RawToDataColumn(Cell.X)].PopupMenu;
- if (P <> nil) and P.AutoPopup then
- begin
- SendCancelMode(nil);
- P.PopupComponent := Self;
- with ClientToScreen(SmallPointToPoint(Pos)) do
- P.Popup(X, Y);
- Result := 1;
- end;
- end;
- end;
-
- procedure TCustomDBGrid.DeferLayout;
- var
- M: TMsg;
- begin
- if HandleAllocated and
- not PeekMessage(M, Handle, cm_DeferLayout, cm_DeferLayout, pm_NoRemove) then
- PostMessage(Handle, cm_DeferLayout, 0, 0);
- CancelLayout;
- end;
-
- procedure TCustomDBGrid.DefineFieldMap;
- var
- I: Integer;
- begin
- if FColumns.State = csCustomized then
- begin { Build the column/field map from the column attributes }
- DataLink.SparseMap := True;
- for I := 0 to FColumns.Count-1 do
- FDataLink.AddMapping(FColumns[I].FieldName);
- end
- else { Build the column/field map from the field list order }
- begin
- FDataLink.SparseMap := False;
- with Datalink.Dataset do
- for I := 0 to FieldList.Count - 1 do
- with FieldList[I] do if Visible then Datalink.AddMapping(FullName);
- end;
- end;
-
- function TCustomDBGrid.UseRightToLeftAlignmentForField(const AField: TField;
- Alignment: TAlignment): Boolean;
- begin
- Result := False;
- if IsRightToLeft then
- Result := OkToChangeFieldAlignment(AField, Alignment);
- end;
-
- procedure TCustomDBGrid.DefaultDrawDataCell(const Rect: TRect; Field: TField;
- State: TGridDrawState);
- var
- Alignment: TAlignment;
- Value: string;
- begin
- Alignment := taLeftJustify;
- Value := '';
- if Assigned(Field) then
- begin
- Alignment := Field.Alignment;
- Value := Field.DisplayText;
- end;
- WriteText(Canvas, Rect, 2, 2, Value, Alignment,
- UseRightToLeftAlignmentForField(Field, Alignment));
- end;
-
- procedure TCustomDBGrid.DefaultDrawColumnCell(const Rect: TRect;
- DataCol: Integer; Column: TColumn; State: TGridDrawState);
- var
- Value: string;
- begin
- Value := '';
- if Assigned(Column.Field) then
- Value := Column.Field.DisplayText;
- WriteText(Canvas, Rect, 2, 2, Value, Column.Alignment,
- UseRightToLeftAlignmentForField(Column.Field, Column.Alignment));
- end;
-
- procedure TCustomDBGrid.ReadColumns(Reader: TReader);
- begin
- Columns.Clear;
- Reader.ReadValue;
- Reader.ReadCollection(Columns);
- end;
-
- procedure TCustomDBGrid.WriteColumns(Writer: TWriter);
- begin
- if Columns.State = csCustomized then
- Writer.WriteCollection(Columns)
- else // ancestor state is customized, ours is not
- Writer.WriteCollection(nil);
- end;
-
- procedure TCustomDBGrid.DefineProperties(Filer: TFiler);
- var
- StoreIt: Boolean;
- vState: TDBGridColumnsState;
- begin
- vState := Columns.State;
- if Filer.Ancestor = nil then
- StoreIt := vState = csCustomized
- else
- if vState <> TCustomDBGrid(Filer.Ancestor).Columns.State then
- StoreIt := True
- else
- StoreIt := (vState = csCustomized) and
- (not CollectionsEqual(Columns, TCustomDBGrid(Filer.Ancestor).Columns));
-
- Filer.DefineProperty('Columns', ReadColumns, WriteColumns, StoreIt);
- end;
-
- function TCustomDBGrid.ColumnAtDepth(Col: TColumn; ADepth: Integer): TColumn;
- begin
- Result := Col;
- while (Result <> nil) and (Result.Depth > ADepth) do
- Result := Result.ParentColumn;
- end;
-
- function TCustomDBGrid.CalcTitleRect(Col: TColumn; ARow: Integer;
- var MasterCol: TColumn): TRect;
- var
- I,J: Integer;
- InBiDiMode: Boolean;
- DrawInfo: TGridDrawInfo;
- begin
- MasterCol := ColumnAtDepth(Col, ARow);
- if MasterCol = nil then Exit;
-
- I := DataToRawColumn(MasterCol.Index);
- if I >= LeftCol then
- J := MasterCol.Depth
- else
- begin
- I := LeftCol;
- if Col.Depth > ARow then
- J := ARow
- else
- J := Col.Depth;
- end;
-
- Result := CellRect(I, J);
-
- InBiDiMode := UseRightToLeftAlignment and
- (Canvas.CanvasOrientation = coLeftToRight);
-
- for I := Col.Index to Columns.Count-1 do
- begin
- if ColumnAtDepth(Columns[I], ARow) <> MasterCol then Break;
- if not InBiDiMode then
- begin
- J := CellRect(DataToRawColumn(I), ARow).Right;
- if J = 0 then Break;
- Result.Right := Max(Result.Right, J);
- end
- else
- begin
- J := CellRect(DataToRawColumn(I), ARow).Left;
- if J >= ClientWidth then Break;
- Result.Left := J;
- end;
- end;
- J := Col.Depth;
- if (J <= ARow) and (J < FixedRows-1) then
- begin
- CalcFixedInfo(DrawInfo);
- Result.Bottom := DrawInfo.Vert.FixedBoundary - DrawInfo.Vert.EffectiveLineWidth;
- end;
- end;
-
- procedure TCustomDBGrid.DrawCell(ACol, ARow: Longint; ARect: TRect; AState: TGridDrawState);
- var
- FrameOffs: Byte;
-
- function RowIsMultiSelected: Boolean;
- var
- Index: Integer;
- begin
- Result := (dgMultiSelect in Options) and Datalink.Active and
- FBookmarks.Find(Datalink.Datasource.Dataset.Bookmark, Index);
- end;
-
- procedure DrawTitleCell(ACol, ARow: Integer; Column: TColumn; var AState: TGridDrawState);
- const
- ScrollArrows: array [Boolean, Boolean] of Integer =
- ((DFCS_SCROLLRIGHT, DFCS_SCROLLLEFT), (DFCS_SCROLLLEFT, DFCS_SCROLLRIGHT));
- var
- MasterCol: TColumn;
- TitleRect, TextRect, ButtonRect: TRect;
- I: Integer;
- InBiDiMode: Boolean;
- begin
- TitleRect := CalcTitleRect(Column, ARow, MasterCol);
-
- if MasterCol = nil then
- begin
- Canvas.FillRect(ARect);
- Exit;
- end;
-
- Canvas.Font := MasterCol.Title.Font;
- Canvas.Brush.Color := MasterCol.Title.Color;
- if [dgRowLines, dgColLines] * Options = [dgRowLines, dgColLines] then
- InflateRect(TitleRect, -1, -1);
- TextRect := TitleRect;
- I := GetSystemMetrics(SM_CXHSCROLL);
- if ((TextRect.Right - TextRect.Left) > I) and MasterCol.Expandable then
- begin
- Dec(TextRect.Right, I);
- ButtonRect := TitleRect;
- ButtonRect.Left := TextRect.Right;
- I := SaveDC(Canvas.Handle);
- try
- Canvas.FillRect(ButtonRect);
- InflateRect(ButtonRect, -1, -1);
- IntersectClipRect(Canvas.Handle, ButtonRect.Left,
- ButtonRect.Top, ButtonRect.Right, ButtonRect.Bottom);
- InflateRect(ButtonRect, 1, 1);
- { DrawFrameControl doesn't draw properly when orienatation has changed.
- It draws as ExtTextOut does. }
- InBiDiMode := Canvas.CanvasOrientation = coRightToLeft;
- if InBiDiMode then { stretch the arrows box }
- Inc(ButtonRect.Right, GetSystemMetrics(SM_CXHSCROLL) + 4);
- DrawFrameControl(Canvas.Handle, ButtonRect, DFC_SCROLL,
- ScrollArrows[InBiDiMode, MasterCol.Expanded] or DFCS_FLAT);
- finally
- RestoreDC(Canvas.Handle, I);
- end;
- end;
- with MasterCol.Title do
- WriteText(Canvas, TextRect, FrameOffs, FrameOffs, Caption, Alignment,
- IsRightToLeft);
- if [dgRowLines, dgColLines] * Options = [dgRowLines, dgColLines] then
- begin
- InflateRect(TitleRect, 1, 1);
- DrawEdge(Canvas.Handle, TitleRect, BDR_RAISEDINNER, BF_BOTTOMRIGHT);
- DrawEdge(Canvas.Handle, TitleRect, BDR_RAISEDINNER, BF_TOPLEFT);
- end;
- AState := AState - [gdFixed]; // prevent box drawing later
- end;
-
- var
- OldActive: Integer;
- Indicator: Integer;
- Highlight: Boolean;
- Value: string;
- DrawColumn: TColumn;
- MultiSelected: Boolean;
- ALeft: Integer;
- begin
- if csLoading in ComponentState then
- begin
- Canvas.Brush.Color := Color;
- Canvas.FillRect(ARect);
- Exit;
- end;
-
- Dec(ARow, FTitleOffset);
- Dec(ACol, FIndicatorOffset);
-
- if (gdFixed in AState) and ([dgRowLines, dgColLines] * Options =
- [dgRowLines, dgColLines]) then
- begin
- InflateRect(ARect, -1, -1);
- FrameOffs := 1;
- end
- else
- FrameOffs := 2;
-
- if (gdFixed in AState) and (ACol < 0) then
- begin
- Canvas.Brush.Color := FixedColor;
- Canvas.FillRect(ARect);
- if Assigned(DataLink) and DataLink.Active then
- begin
- MultiSelected := False;
- if ARow >= 0 then
- begin
- OldActive := FDataLink.ActiveRecord;
- try
- FDatalink.ActiveRecord := ARow;
- MultiSelected := RowIsMultiselected;
- finally
- FDatalink.ActiveRecord := OldActive;
- end;
- end;
- if (ARow = FDataLink.ActiveRecord) or MultiSelected then
- begin
- Indicator := 0;
- if FDataLink.DataSet <> nil then
- case FDataLink.DataSet.State of
- dsEdit: Indicator := 1;
- dsInsert: Indicator := 2;
- dsBrowse:
- if MultiSelected then
- if (ARow <> FDatalink.ActiveRecord) then
- Indicator := 3
- else
- Indicator := 4; // multiselected and current row
- end;
- FIndicators.BkColor := FixedColor;
- ALeft := ARect.Right - FIndicators.Width - FrameOffs;
- if Canvas.CanvasOrientation = coRightToLeft then Inc(ALeft);
- FIndicators.Draw(Canvas, ALeft,
- (ARect.Top + ARect.Bottom - FIndicators.Height) shr 1, Indicator, True);
- if ARow = FDatalink.ActiveRecord then
- FSelRow := ARow + FTitleOffset;
- end;
- end;
- end
- else with Canvas do
- begin
- DrawColumn := Columns[ACol];
- if not DrawColumn.Showing then Exit;
- if not (gdFixed in AState) then
- begin
- Font := DrawColumn.Font;
- Brush.Color := DrawColumn.Color;
- end;
- if ARow < 0 then
- DrawTitleCell(ACol, ARow + FTitleOffset, DrawColumn, AState)
- else if (FDataLink = nil) or not FDataLink.Active then
- FillRect(ARect)
- else
- begin
- Value := '';
- OldActive := FDataLink.ActiveRecord;
- try
- FDataLink.ActiveRecord := ARow;
- if Assigned(DrawColumn.Field) then
- Value := DrawColumn.Field.DisplayText;
- Highlight := HighlightCell(ACol, ARow, Value, AState);
- if Highlight then
- begin
- Brush.Color := clHighlight;
- Font.Color := clHighlightText;
- end;
- if not Enabled then
- Font.Color := clGrayText;
- if FDefaultDrawing then
- WriteText(Canvas, ARect, 2, 2, Value, DrawColumn.Alignment,
- UseRightToLeftAlignmentForField(DrawColumn.Field, DrawColumn.Alignment));
- if Columns.State = csDefault then
- DrawDataCell(ARect, DrawColumn.Field, AState);
- DrawColumnCell(ARect, ACol, DrawColumn, AState);
- finally
- FDataLink.ActiveRecord := OldActive;
- end;
- if FDefaultDrawing and (gdSelected in AState)
- and ((dgAlwaysShowSelection in Options) or Focused)
- and not (csDesigning in ComponentState)
- and not (dgRowSelect in Options)
- and (UpdateLock = 0)
- and (ValidParentForm(Self).ActiveControl = Self) then
- Windows.DrawFocusRect(Handle, ARect);
- end;
- end;
- if (gdFixed in AState) and ([dgRowLines, dgColLines] * Options =
- [dgRowLines, dgColLines]) then
- begin
- InflateRect(ARect, 1, 1);
- DrawEdge(Canvas.Handle, ARect, BDR_RAISEDINNER, BF_BOTTOMRIGHT);
- DrawEdge(Canvas.Handle, ARect, BDR_RAISEDINNER, BF_TOPLEFT);
- end;
- end;
-
- procedure TCustomDBGrid.DrawDataCell(const Rect: TRect; Field: TField;
- State: TGridDrawState);
- begin
- if Assigned(FOnDrawDataCell) then FOnDrawDataCell(Self, Rect, Field, State);
- end;
-
- procedure TCustomDBGrid.DrawColumnCell(const Rect: TRect; DataCol: Integer;
- Column: TColumn; State: TGridDrawState);
- begin
- if Assigned(OnDrawColumnCell) then
- OnDrawColumnCell(Self, Rect, DataCol, Column, State);
- end;
-
- procedure TCustomDBGrid.EditButtonClick;
- begin
- if Assigned(FOnEditButtonClick) then
- FOnEditButtonClick(Self)
- else
- ShowPopupEditor(Columns[SelectedIndex]);
- end;
-
- procedure TCustomDBGrid.EditingChanged;
- begin
- if dgIndicator in Options then InvalidateCell(0, FSelRow);
- end;
-
- procedure TCustomDBGrid.EndLayout;
- begin
- if FLayoutLock > 0 then
- begin
- try
- try
- if FLayoutLock = 1 then
- InternalLayout;
- finally
- if FLayoutLock = 1 then
- FColumns.EndUpdate;
- end;
- finally
- Dec(FLayoutLock);
- EndUpdate;
- end;
- end;
- end;
-
- procedure TCustomDBGrid.EndUpdate;
- begin
- if FUpdateLock > 0 then
- Dec(FUpdateLock);
- end;
-
- function TCustomDBGrid.GetColField(DataCol: Integer): TField;
- begin
- Result := nil;
- if (DataCol >= 0) and FDatalink.Active and (DataCol < Columns.Count) then
- Result := Columns[DataCol].Field;
- end;
-
- function TCustomDBGrid.GetDataSource: TDataSource;
- begin
- Result := FDataLink.DataSource;
- end;
-
- function TCustomDBGrid.GetEditLimit: Integer;
- begin
- Result := 0;
- if Assigned(SelectedField) and (SelectedField.DataType in [ftString, ftWideString]) then
- Result := SelectedField.Size;
- end;
-
- function TCustomDBGrid.GetEditMask(ACol, ARow: Longint): string;
- begin
- Result := '';
- if FDatalink.Active then
- with Columns[RawToDataColumn(ACol)] do
- if Assigned(Field) then
- Result := Field.EditMask;
- end;
-
- function TCustomDBGrid.GetEditText(ACol, ARow: Longint): string;
- begin
- Result := '';
- if FDatalink.Active then
- with Columns[RawToDataColumn(ACol)] do
- if Assigned(Field) then
- Result := Field.Text;
- FEditText := Result;
- end;
-
- function TCustomDBGrid.GetFieldCount: Integer;
- begin
- Result := FDatalink.FieldCount;
- end;
-
- function TCustomDBGrid.GetFields(FieldIndex: Integer): TField;
- begin
- Result := FDatalink.Fields[FieldIndex];
- end;
-
- function TCustomDBGrid.GetFieldValue(ACol: Integer): string;
- var
- Field: TField;
- begin
- Result := '';
- Field := GetColField(ACol);
- if Field <> nil then Result := Field.DisplayText;
- end;
-
- function TCustomDBGrid.GetSelectedField: TField;
- var
- Index: Integer;
- begin
- Index := SelectedIndex;
- if Index <> -1 then
- Result := Columns[Index].Field
- else
- Result := nil;
- end;
-
- function TCustomDBGrid.GetSelectedIndex: Integer;
- begin
- Result := RawToDataColumn(Col);
- end;
-
- function TCustomDBGrid.HighlightCell(DataCol, DataRow: Integer;
- const Value: string; AState: TGridDrawState): Boolean;
- var
- Index: Integer;
- begin
- Result := False;
- if (dgMultiSelect in Options) and Datalink.Active then
- Result := FBookmarks.Find(Datalink.Datasource.Dataset.Bookmark, Index);
- if not Result then
- Result := (gdSelected in AState)
- and ((dgAlwaysShowSelection in Options) or Focused)
- { updatelock eliminates flicker when tabbing between rows }
- and ((UpdateLock = 0) or (dgRowSelect in Options));
- end;
-
- procedure TCustomDBGrid.KeyDown(var Key: Word; Shift: TShiftState);
- var
- KeyDownEvent: TKeyEvent;
-
- procedure ClearSelection;
- begin
- if (dgMultiSelect in Options) then
- begin
- FBookmarks.Clear;
- FSelecting := False;
- end;
- end;
-
- procedure DoSelection(Select: Boolean; Direction: Integer);
- var
- AddAfter: Boolean;
- begin
- AddAfter := False;
- BeginUpdate;
- try
- if (dgMultiSelect in Options) and FDatalink.Active then
- if Select and (ssShift in Shift) then
- begin
- if not FSelecting then
- begin
- FSelectionAnchor := FBookmarks.CurrentRow;
- FBookmarks.CurrentRowSelected := True;
- FSelecting := True;
- AddAfter := True;
- end
- else
- with FBookmarks do
- begin
- AddAfter := Compare(CurrentRow, FSelectionAnchor) <> -Direction;
- if not AddAfter then
- CurrentRowSelected := False;
- end
- end
- else
- ClearSelection;
- FDatalink.MoveBy(Direction);
- if AddAfter then FBookmarks.CurrentRowSelected := True;
- finally
- EndUpdate;
- end;
- end;
-
- procedure NextRow(Select: Boolean);
- begin
- with FDatalink.Dataset do
- begin
- if (State = dsInsert) and not Modified and not FDatalink.FModified then
- if FDataLink.EOF then Exit else Cancel
- else
- DoSelection(Select, 1);
- if FDataLink.EOF and CanModify and (not ReadOnly) and (dgEditing in Options) then
- Append;
- end;
- end;
-
- procedure PriorRow(Select: Boolean);
- begin
- with FDatalink.Dataset do
- if (State = dsInsert) and not Modified and FDataLink.EOF and
- not FDatalink.FModified then
- Cancel
- else
- DoSelection(Select, -1);
- end;
-
- procedure Tab(GoForward: Boolean);
- var
- ACol, Original: Integer;
- begin
- ACol := Col;
- Original := ACol;
- BeginUpdate; { Prevent highlight flicker on tab to next/prior row }
- try
- while True do
- begin
- if GoForward then
- Inc(ACol) else
- Dec(ACol);
- if ACol >= ColCount then
- begin
- NextRow(False);
- ACol := FIndicatorOffset;
- end
- else if ACol < FIndicatorOffset then
- begin
- PriorRow(False);
- ACol := ColCount - FIndicatorOffset;
- end;
- if ACol = Original then Exit;
- if TabStops[ACol] then
- begin
- MoveCol(ACol, 0);
- Exit;
- end;
- end;
- finally
- EndUpdate;
- end;
- end;
-
- function DeletePrompt: Boolean;
- var
- Msg: string;
- begin
- if (FBookmarks.Count > 1) then
- Msg := SDeleteMultipleRecordsQuestion
- else
- Msg := SDeleteRecordQuestion;
- Result := not (dgConfirmDelete in Options) or
- (MessageDlg(Msg, mtConfirmation, mbOKCancel, 0) <> idCancel);
- end;
-
- const
- RowMovementKeys = [VK_UP, VK_PRIOR, VK_DOWN, VK_NEXT, VK_HOME, VK_END];
-
- begin
- KeyDownEvent := OnKeyDown;
- if Assigned(KeyDownEvent) then KeyDownEvent(Self, Key, Shift);
- if not FDatalink.Active or not CanGridAcceptKey(Key, Shift) then Exit;
- if UseRightToLeftAlignment then
- if Key = VK_LEFT then
- Key := VK_RIGHT
- else if Key = VK_RIGHT then
- Key := VK_LEFT;
- with FDatalink.DataSet do
- if ssCtrl in Shift then
- begin
- if (Key in RowMovementKeys) then ClearSelection;
- case Key of
- VK_UP, VK_PRIOR: FDataLink.MoveBy(-FDatalink.ActiveRecord);
- VK_DOWN, VK_NEXT: FDataLink.MoveBy(FDatalink.BufferCount - FDatalink.ActiveRecord - 1);
- VK_LEFT: MoveCol(FIndicatorOffset, 1);
- VK_RIGHT: MoveCol(ColCount - 1, -1);
- VK_HOME: First;
- VK_END: Last;
- VK_DELETE:
- if (not ReadOnly) and not IsEmpty
- and CanModify and DeletePrompt then
- if FBookmarks.Count > 0 then
- FBookmarks.Delete
- else
- Delete;
- end
- end
- else
- case Key of
- VK_UP: PriorRow(True);
- VK_DOWN: NextRow(True);
- VK_LEFT:
- if dgRowSelect in Options then
- PriorRow(False) else
- MoveCol(Col - 1, -1);
- VK_RIGHT:
- if dgRowSelect in Options then
- NextRow(False) else
- MoveCol(Col + 1, 1);
- VK_HOME:
- if (ColCount = FIndicatorOffset+1)
- or (dgRowSelect in Options) then
- begin
- ClearSelection;
- First;
- end
- else
- MoveCol(FIndicatorOffset, 1);
- VK_END:
- if (ColCount = FIndicatorOffset+1)
- or (dgRowSelect in Options) then
- begin
- ClearSelection;
- Last;
- end
- else
- MoveCol(ColCount - 1, -1);
- VK_NEXT:
- begin
- ClearSelection;
- FDataLink.MoveBy(VisibleRowCount);
- end;
- VK_PRIOR:
- begin
- ClearSelection;
- FDataLink.MoveBy(-VisibleRowCount);
- end;
- VK_INSERT:
- if CanModify and (not ReadOnly) and (dgEditing in Options) then
- begin
- ClearSelection;
- Insert;
- end;
- VK_TAB: if not (ssAlt in Shift) then Tab(not (ssShift in Shift));
- VK_ESCAPE:
- begin
- if SysLocale.PriLangID = LANG_KOREAN then
- FIsESCKey := True;
- FDatalink.Reset;
- ClearSelection;
- if not (dgAlwaysShowEditor in Options) then HideEditor;
- end;
- VK_F2: EditorMode := True;
- end;
- end;
-
- procedure TCustomDBGrid.KeyPress(var Key: Char);
- begin
- FIsESCKey := False;
- if not (dgAlwaysShowEditor in Options) and (Key = #13) then
- FDatalink.UpdateData;
- inherited KeyPress(Key);
- end;
-
- { InternalLayout is called with layout locks and column locks in effect }
- procedure TCustomDBGrid.InternalLayout;
-
- function FieldIsMapped(F: TField): Boolean;
- var
- X: Integer;
- begin
- Result := False;
- if F = nil then Exit;
- for X := 0 to FDatalink.FieldCount-1 do
- if FDatalink.Fields[X] = F then
- begin
- Result := True;
- Exit;
- end;
- end;
-
- procedure CheckForPassthroughs; // check for Columns.State flip-flop
- var
- SeenPassthrough: Boolean;
- I, J: Integer;
- Column: TColumn;
- begin
- SeenPassthrough := False;
- for I := 0 to FColumns.Count-1 do
- if not FColumns[I].IsStored then
- SeenPassthrough := True
- else if SeenPassthrough then
- begin // we have both persistent and non-persistent columns. Kill the latter
- for J := FColumns.Count-1 downto 0 do
- begin
- Column := FColumns[J];
- if not Column.IsStored then
- Column.Free;
- end;
- Exit;
- end;
- end;
-
- procedure ResetColumnFieldBindings;
- var
- I, J, K: Integer;
- Fld: TField;
- Column: TColumn;
- begin
- if FColumns.State = csDefault then
- begin
- { Destroy columns whose fields have been destroyed or are no longer
- in field map }
- if (not FDataLink.Active) and (FDatalink.DefaultFields) then
- FColumns.Clear
- else
- for J := FColumns.Count-1 downto 0 do
- with FColumns[J] do
- if not Assigned(Field)
- or not FieldIsMapped(Field) then Free;
- I := FDataLink.FieldCount;
- if (I = 0) and (FColumns.Count = 0) then Inc(I);
- for J := 0 to I-1 do
- begin
- Fld := FDatalink.Fields[J];
- if Assigned(Fld) then
- begin
- K := J;
- { Pointer compare is valid here because the grid sets matching
- column.field properties to nil in response to field object
- free notifications. Closing a dataset that has only default
- field objects will destroy all the fields and set associated
- column.field props to nil. }
- while (K < FColumns.Count) and (FColumns[K].Field <> Fld) do
- Inc(K);
- if K < FColumns.Count then
- Column := FColumns[K]
- else
- begin
- Column := FColumns.InternalAdd;
- Column.Field := Fld;
- end;
- end
- else
- Column := FColumns.InternalAdd;
- Column.Index := J;
- end;
- end
- else
- begin
- { Force columns to reaquire fields (in case dataset has changed) }
- for I := 0 to FColumns.Count-1 do
- FColumns[I].Field := nil;
- end;
- end;
-
- procedure MeasureTitleHeights;
- var
- I, J, K, D, B: Integer;
- RestoreCanvas: Boolean;
- Heights: array of Integer;
- begin
- RestoreCanvas := not HandleAllocated;
- if RestoreCanvas then
- Canvas.Handle := GetDC(0);
- try
- Canvas.Font := Font;
- K := Canvas.TextHeight('Wg') + 3;
- if dgRowLines in Options then
- Inc(K, GridLineWidth);
- DefaultRowHeight := K;
- B := GetSystemMetrics(SM_CYHSCROLL);
- if dgTitles in Options then
- begin
- SetLength(Heights, FTitleOffset+1);
- for I := 0 to FColumns.Count-1 do
- begin
- Canvas.Font := FColumns[I].Title.Font;
- D := FColumns[I].Depth;
- if D <= High(Heights) then
- begin
- J := Canvas.TextHeight('Wg') + 4;
- if FColumns[I].Expandable and (B > J) then
- J := B;
- Heights[D] := Max(J, Heights[D]);
- end;
- end;
- if Heights[0] = 0 then
- begin
- Canvas.Font := FTitleFont;
- Heights[0] := Canvas.TextHeight('Wg') + 4;
- end;
- for I := 0 to High(Heights)-1 do
- RowHeights[I] := Heights[I];
- end;
- finally
- if RestoreCanvas then
- begin
- ReleaseDC(0,Canvas.Handle);
- Canvas.Handle := 0;
- end;
- end;
- end;
-
- var
- I, J: Integer;
- begin
- if (csLoading in ComponentState) then Exit;
-
- if HandleAllocated then KillMessage(Handle, cm_DeferLayout);
-
- CheckForPassthroughs;
- FIndicatorOffset := 0;
- if dgIndicator in Options then
- Inc(FIndicatorOffset);
- FDatalink.ClearMapping;
- if FDatalink.Active then DefineFieldMap;
- DoubleBuffered := (FDatalink.Dataset <> nil) and FDatalink.Dataset.ObjectView;
- ResetColumnFieldBindings;
- FVisibleColumns.Clear;
- for I := 0 to FColumns.Count-1 do
- if FColumns[I].Showing then FVisibleColumns.Add(FColumns[I]);
- ColCount := FColumns.Count + FIndicatorOffset;
- inherited FixedCols := FIndicatorOffset;
- FTitleOffset := 0;
- if dgTitles in Options then
- begin
- FTitleOffset := 1;
- if (FDatalink <> nil) and (FDatalink.Dataset <> nil)
- and FDatalink.Dataset.ObjectView then
- begin
- for I := 0 to FColumns.Count-1 do
- begin
- if FColumns[I].Showing then
- begin
- J := FColumns[I].Depth;
- if J >= FTitleOffset then FTitleOffset := J+1;
- end;
- end;
- end;
- end;
- UpdateRowCount;
- MeasureTitleHeights;
- SetColumnAttributes;
- UpdateActive;
- Invalidate;
- end;
-
- procedure TCustomDBGrid.LayoutChanged;
- begin
- if AcquireLayoutLock then
- EndLayout;
- end;
-
- procedure TCustomDBGrid.LinkActive(Value: Boolean);
- var
- Comp: TComponent;
- I: Integer;
- begin
- if not Value then HideEditor;
- FBookmarks.LinkActive(Value);
- try
- LayoutChanged;
- finally
- for I := ComponentCount-1 downto 0 do
- begin
- Comp := Components[I]; // Free all the popped-up subgrids
- if (Comp is TCustomDBGrid)
- and (TCustomDBGrid(Comp).DragKind = dkDock) then
- Comp.Free;
- end;
- UpdateScrollBar;
- if Value and (dgAlwaysShowEditor in Options) then ShowEditor;
- end;
- end;
-
- procedure TCustomDBGrid.Loaded;
- begin
- inherited Loaded;
- if FColumns.Count > 0 then
- ColCount := FColumns.Count;
- LayoutChanged;
- end;
-
- function TCustomDBGrid.PtInExpandButton(X,Y: Integer; var MasterCol: TColumn): Boolean;
- var
- Cell: TGridCoord;
- R: TRect;
- begin
- MasterCol := nil;
- Result := False;
- Cell := MouseCoord(X,Y);
- if (Cell.Y < FTitleOffset) and FDatalink.Active
- and (Cell.X >= FIndicatorOffset)
- and (RawToDataColumn(Cell.X) < Columns.Count) then
- begin
- R := CalcTitleRect(Columns[RawToDataColumn(Cell.X)], Cell.Y, MasterCol);
- if not UseRightToLeftAlignment then
- R.Left := R.Right - GetSystemMetrics(SM_CXHSCROLL)
- else
- R.Right := R.Left + GetSystemMetrics(SM_CXHSCROLL);
- Result := MasterCol.Expandable and PtInRect(R, Point(X,Y));
- end;
- end;
-
- procedure TCustomDBGrid.MouseDown(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer);
- var
- Cell: TGridCoord;
- OldCol,OldRow: Integer;
- MasterCol: TColumn;
- begin
- if not AcquireFocus then Exit;
- if (ssDouble in Shift) and (Button = mbLeft) then
- begin
- DblClick;
- Exit;
- end;
-
- if Sizing(X, Y) then
- begin
- FDatalink.UpdateData;
- inherited MouseDown(Button, Shift, X, Y);
- Exit;
- end;
-
- Cell := MouseCoord(X, Y);
- if (Cell.X < 0) and (Cell.Y < 0) then
- begin
- inherited MouseDown(Button, Shift, X, Y);
- Exit;
- end;
-
- if (DragKind = dkDock) and (Cell.X < FIndicatorOffset) and
- (Cell.Y < FTitleOffset) and (not (csDesigning in ComponentState)) then
- begin
- BeginDrag(false);
- Exit;
- end;
-
- if PtInExpandButton(X,Y, MasterCol) then
- begin
- MasterCol.Expanded := not MasterCol.Expanded;
- ReleaseCapture;
- UpdateDesigner;
- Exit;
- end;
-
- if ((csDesigning in ComponentState) or (dgColumnResize in Options)) and
- (Cell.Y < FTitleOffset) then
- begin
- FDataLink.UpdateData;
- inherited MouseDown(Button, Shift, X, Y);
- Exit;
- end;
-
- if FDatalink.Active then
- with Cell do
- begin
- BeginUpdate; { eliminates highlight flicker when selection moves }
- try
- FDatalink.UpdateData; // validate before moving
- HideEditor;
- OldCol := Col;
- OldRow := Row;
- if (Y >= FTitleOffset) and (Y - Row <> 0) then
- FDatalink.MoveBy(Y - Row);
- if X >= FIndicatorOffset then
- MoveCol(X, 0);
- if (dgMultiSelect in Options) and FDatalink.Active then
- with FBookmarks do
- begin
- FSelecting := False;
- if ssCtrl in Shift then
- CurrentRowSelected := not CurrentRowSelected
- else
- begin
- Clear;
- CurrentRowSelected := True;
- end;
- end;
- if (Button = mbLeft) and
- (((X = OldCol) and (Y = OldRow)) or (dgAlwaysShowEditor in Options)) then
- ShowEditor { put grid in edit mode }
- else
- InvalidateEditor; { draw editor, if needed }
- finally
- EndUpdate;
- end;
- end;
- end;
-
- procedure TCustomDBGrid.MouseUp(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer);
- var
- Cell: TGridCoord;
- SaveState: TGridState;
- begin
- SaveState := FGridState;
- inherited MouseUp(Button, Shift, X, Y);
- if (SaveState = gsRowSizing) or (SaveState = gsColSizing) or
- ((InplaceEditor <> nil) and (InplaceEditor.Visible) and
- (PtInRect(InplaceEditor.BoundsRect, Point(X,Y)))) then Exit;
- Cell := MouseCoord(X,Y);
- if (Button = mbLeft) and (Cell.X >= FIndicatorOffset) and (Cell.Y >= 0) then
- if Cell.Y < FTitleOffset then
- TitleClick(Columns[RawToDataColumn(Cell.X)])
- else
- CellClick(Columns[SelectedIndex]);
- end;
-
- procedure TCustomDBGrid.MoveCol(RawCol, Direction: Integer);
- var
- OldCol: Integer;
- begin
- FDatalink.UpdateData;
- if RawCol >= ColCount then
- RawCol := ColCount - 1;
- if RawCol < FIndicatorOffset then RawCol := FIndicatorOffset;
- if Direction <> 0 then
- begin
- while (RawCol < ColCount) and (RawCol >= FIndicatorOffset) and
- (ColWidths[RawCol] <= 0) do
- Inc(RawCol, Direction);
- if (RawCol >= ColCount) or (RawCol < FIndicatorOffset) then Exit;
- end;
- OldCol := Col;
- if RawCol <> OldCol then
- begin
- if not FInColExit then
- begin
- FInColExit := True;
- try
- ColExit;
- finally
- FInColExit := False;
- end;
- if Col <> OldCol then Exit;
- end;
- if not (dgAlwaysShowEditor in Options) then HideEditor;
- Col := RawCol;
- ColEnter;
- end;
- end;
-
- procedure TCustomDBGrid.Notification(AComponent: TComponent;
- Operation: TOperation);
- var
- I: Integer;
- NeedLayout: Boolean;
- begin
- inherited Notification(AComponent, Operation);
- if (Operation = opRemove) then
- begin
- if (AComponent is TPopupMenu) then
- begin
- for I := 0 to Columns.Count-1 do
- if Columns[I].PopupMenu = AComponent then
- Columns[I].PopupMenu := nil;
- end
- else if (FDataLink <> nil) then
- if (AComponent = DataSource) then
- DataSource := nil
- else if (AComponent is TField) then
- begin
- NeedLayout := False;
- BeginLayout;
- try
- for I := 0 to Columns.Count-1 do
- with Columns[I] do
- if Field = AComponent then
- begin
- Field := nil;
- NeedLayout := True;
- end;
- finally
- if NeedLayout and Assigned(FDatalink.Dataset)
- and not FDatalink.Dataset.ControlsDisabled then
- EndLayout
- else
- DeferLayout;
- end;
- end;
- end;
- end;
-
- procedure TCustomDBGrid.RecordChanged(Field: TField);
- var
- I: Integer;
- CField: TField;
- begin
- if not HandleAllocated then Exit;
- if Field = nil then
- Invalidate
- else
- begin
- for I := 0 to Columns.Count - 1 do
- if Columns[I].Field = Field then
- InvalidateCol(DataToRawColumn(I));
- end;
- CField := SelectedField;
- if ((Field = nil) or (CField = Field)) and
- (Assigned(CField) and (CField.Text <> FEditText) and
- ((SysLocale.PriLangID <> LANG_KOREAN) or FIsESCKey)) then
- begin
- InvalidateEditor;
- if InplaceEditor <> nil then InplaceEditor.Deselect;
- end;
- end;
-
- procedure TCustomDBGrid.Scroll(Distance: Integer);
- var
- OldRect, NewRect: TRect;
- RowHeight: Integer;
- begin
- if not HandleAllocated then Exit;
- OldRect := BoxRect(0, Row, ColCount - 1, Row);
- if (FDataLink.ActiveRecord >= RowCount - FTitleOffset) then UpdateRowCount;
- UpdateScrollBar;
- UpdateActive;
- NewRect := BoxRect(0, Row, ColCount - 1, Row);
- ValidateRect(Handle, @OldRect);
- InvalidateRect(Handle, @OldRect, False);
- InvalidateRect(Handle, @NewRect, False);
- if Distance <> 0 then
- begin
- HideEditor;
- try
- if Abs(Distance) > VisibleRowCount then
- begin
- Invalidate;
- Exit;
- end
- else
- begin
- RowHeight := DefaultRowHeight;
- if dgRowLines in Options then Inc(RowHeight, GridLineWidth);
- if dgIndicator in Options then
- begin
- OldRect := BoxRect(0, FSelRow, ColCount - 1, FSelRow);
- InvalidateRect(Handle, @OldRect, False);
- end;
- NewRect := BoxRect(0, FTitleOffset, ColCount - 1, 1000);
- ScrollWindowEx(Handle, 0, -RowHeight * Distance, @NewRect, @NewRect,
- 0, nil, SW_Invalidate);
- if dgIndicator in Options then
- begin
- NewRect := BoxRect(0, Row, ColCount - 1, Row);
- InvalidateRect(Handle, @NewRect, False);
- end;
- end;
- finally
- if dgAlwaysShowEditor in Options then ShowEditor;
- end;
- end;
- if UpdateLock = 0 then Update;
- end;
-
- procedure TCustomDBGrid.SetColumns(Value: TDBGridColumns);
- begin
- Columns.Assign(Value);
- end;
-
- function ReadOnlyField(Field: TField): Boolean;
- var
- MasterField: TField;
- begin
- Result := Field.ReadOnly;
- if not Result and (Field.FieldKind = fkLookup) then
- begin
- Result := True;
- if Field.DataSet = nil then Exit;
- MasterField := Field.Dataset.FindField(Field.KeyFields);
- if MasterField = nil then Exit;
- Result := MasterField.ReadOnly;
- end;
- end;
-
- procedure TCustomDBGrid.SetColumnAttributes;
- var
- I: Integer;
- begin
- for I := 0 to FColumns.Count-1 do
- with FColumns[I] do
- begin
- TabStops[I + FIndicatorOffset] := Showing and not ReadOnly and DataLink.Active and
- Assigned(Field) and not (Field.FieldKind = fkCalculated) and not ReadOnlyField(Field);
- ColWidths[I + FIndicatorOffset] := Width;
- end;
- if (dgIndicator in Options) then
- ColWidths[0] := IndicatorWidth;
- end;
-
- procedure TCustomDBGrid.SetDataSource(Value: TDataSource);
- begin
- if Value = FDatalink.Datasource then Exit;
- FBookmarks.Clear;
- FDataLink.DataSource := Value;
- if Value <> nil then Value.FreeNotification(Self);
- end;
-
- procedure TCustomDBGrid.SetEditText(ACol, ARow: Longint; const Value: string);
- begin
- FEditText := Value;
- end;
-
- procedure TCustomDBGrid.SetOptions(Value: TDBGridOptions);
- const
- LayoutOptions = [dgEditing, dgAlwaysShowEditor, dgTitles, dgIndicator,
- dgColLines, dgRowLines, dgRowSelect, dgAlwaysShowSelection];
- var
- NewGridOptions: TGridOptions;
- ChangedOptions: TDBGridOptions;
- begin
- if FOptions <> Value then
- begin
- NewGridOptions := [];
- if dgColLines in Value then
- NewGridOptions := NewGridOptions + [goFixedVertLine, goVertLine];
- if dgRowLines in Value then
- NewGridOptions := NewGridOptions + [goFixedHorzLine, goHorzLine];
- if dgColumnResize in Value then
- NewGridOptions := NewGridOptions + [goColSizing, goColMoving];
- if dgTabs in Value then Include(NewGridOptions, goTabs);
- if dgRowSelect in Value then
- begin
- Include(NewGridOptions, goRowSelect);
- Exclude(Value, dgAlwaysShowEditor);
- Exclude(Value, dgEditing);
- end;
- if dgEditing in Value then Include(NewGridOptions, goEditing);
- if dgAlwaysShowEditor in Value then Include(NewGridOptions, goAlwaysShowEditor);
- inherited Options := NewGridOptions;
- if dgMultiSelect in (FOptions - Value) then FBookmarks.Clear;
- ChangedOptions := (FOptions + Value) - (FOptions * Value);
- FOptions := Value;
- if ChangedOptions * LayoutOptions <> [] then LayoutChanged;
- end;
- end;
-
- procedure TCustomDBGrid.SetSelectedField(Value: TField);
- var
- I: Integer;
- begin
- if Value = nil then Exit;
- for I := 0 to Columns.Count - 1 do
- if Columns[I].Field = Value then
- MoveCol(DataToRawColumn(I), 0);
- end;
-
- procedure TCustomDBGrid.SetSelectedIndex(Value: Integer);
- begin
- MoveCol(DataToRawColumn(Value), 0);
- end;
-
- procedure TCustomDBGrid.SetTitleFont(Value: TFont);
- begin
- FTitleFont.Assign(Value);
- if dgTitles in Options then LayoutChanged;
- end;
-
- function TCustomDBGrid.StoreColumns: Boolean;
- begin
- Result := Columns.State = csCustomized;
- end;
-
- procedure TCustomDBGrid.TimedScroll(Direction: TGridScrollDirection);
- begin
- if FDatalink.Active then
- begin
- with FDatalink do
- begin
- if sdUp in Direction then
- begin
- FDataLink.MoveBy(-ActiveRecord - 1);
- Exclude(Direction, sdUp);
- end;
- if sdDown in Direction then
- begin
- FDataLink.MoveBy(RecordCount - ActiveRecord);
- Exclude(Direction, sdDown);
- end;
- end;
- if Direction <> [] then inherited TimedScroll(Direction);
- end;
- end;
-
- procedure TCustomDBGrid.TitleClick(Column: TColumn);
- begin
- if Assigned(FOnTitleClick) then FOnTitleClick(Column);
- end;
-
- procedure TCustomDBGrid.TitleFontChanged(Sender: TObject);
- begin
- if (not FSelfChangingTitleFont) and not (csLoading in ComponentState) then
- ParentFont := False;
- if dgTitles in Options then LayoutChanged;
- end;
-
- procedure TCustomDBGrid.UpdateActive;
- var
- NewRow: Integer;
- Field: TField;
- begin
- if FDatalink.Active and HandleAllocated and not (csLoading in ComponentState) then
- begin
- NewRow := FDatalink.ActiveRecord + FTitleOffset;
- if Row <> NewRow then
- begin
- if not (dgAlwaysShowEditor in Options) then HideEditor;
- MoveColRow(Col, NewRow, False, False);
- InvalidateEditor;
- end;
- Field := SelectedField;
- if Assigned(Field) and (Field.Text <> FEditText) then
- InvalidateEditor;
- end;
- end;
-
- procedure TCustomDBGrid.UpdateData;
- var
- Field: TField;
- begin
- Field := SelectedField;
- if Assigned(Field) then
- Field.Text := FEditText;
- end;
-
- procedure TCustomDBGrid.UpdateRowCount;
- var
- OldRowCount: Integer;
- begin
- OldRowCount := RowCount;
- if RowCount <= FTitleOffset then RowCount := FTitleOffset + 1;
- FixedRows := FTitleOffset;
- with FDataLink do
- if not Active or (RecordCount = 0) or not HandleAllocated then
- RowCount := 1 + FTitleOffset
- else
- begin
- RowCount := 1000;
- FDataLink.BufferCount := VisibleRowCount;
- RowCount := RecordCount + FTitleOffset;
- if dgRowSelect in Options then TopRow := FixedRows;
- UpdateActive;
- end;
- if OldRowCount <> RowCount then Invalidate;
- end;
-
- procedure TCustomDBGrid.UpdateScrollBar;
- var
- SIOld, SINew: TScrollInfo;
- begin
- if FDatalink.Active and HandleAllocated then
- with FDatalink.DataSet do
- begin
- SIOld.cbSize := sizeof(SIOld);
- SIOld.fMask := SIF_ALL;
- GetScrollInfo(Self.Handle, SB_VERT, SIOld);
- SINew := SIOld;
- if IsSequenced then
- begin
- SINew.nMin := 1;
- SINew.nPage := Self.VisibleRowCount;
- SINew.nMax := Integer(DWORD(RecordCount) + SINew.nPage - 1);
- if State in [dsInactive, dsBrowse, dsEdit] then
- SINew.nPos := RecNo; // else keep old pos
- end
- else
- begin
- SINew.nMin := 0;
- SINew.nPage := 0;
- SINew.nMax := 4;
- if FDataLink.BOF then SINew.nPos := 0
- else if FDataLink.EOF then SINew.nPos := 4
- else SINew.nPos := 2;
- end;
- if (SINew.nMin <> SIOld.nMin) or (SINew.nMax <> SIOld.nMax) or
- (SINew.nPage <> SIOld.nPage) or (SINew.nPos <> SIOld.nPos) then
- SetScrollInfo(Self.Handle, SB_VERT, SINew, True);
- end;
- end;
-
- function TCustomDBGrid.ValidFieldIndex(FieldIndex: Integer): Boolean;
- begin
- Result := DataLink.GetMappedIndex(FieldIndex) >= 0;
- end;
-
- procedure TCustomDBGrid.CMParentFontChanged(var Message: TMessage);
- begin
- inherited;
- if ParentFont then
- begin
- FSelfChangingTitleFont := True;
- try
- TitleFont := Font;
- finally
- FSelfChangingTitleFont := False;
- end;
- LayoutChanged;
- end;
- end;
-
- procedure TCustomDBGrid.CMBiDiModeChanged(var Message: TMessage);
- var
- Loop: Integer;
- begin
- inherited;
- for Loop := 0 to ComponentCount - 1 do
- if Components[Loop] is TCustomDBGrid then
- with Components[Loop] as TCustomDBGrid do
- { Changing the window, echos down to the subgrid }
- if Parent <> nil then
- Parent.BiDiMode := Self.BiDiMode;
- end;
-
- procedure TCustomDBGrid.CMExit(var Message: TMessage);
- begin
- try
- if FDatalink.Active then
- with FDatalink.Dataset do
- if (dgCancelOnExit in Options) and (State = dsInsert) and
- not Modified and not FDatalink.FModified then
- Cancel else
- FDataLink.UpdateData;
- except
- SetFocus;
- raise;
- end;
- inherited;
- end;
-
- procedure TCustomDBGrid.CMFontChanged(var Message: TMessage);
- var
- I: Integer;
- begin
- inherited;
- BeginLayout;
- try
- for I := 0 to Columns.Count-1 do
- Columns[I].RefreshDefaultFont;
- finally
- EndLayout;
- end;
- end;
-
- procedure TCustomDBGrid.CMDeferLayout(var Message);
- begin
- if AcquireLayoutLock then
- EndLayout
- else
- DeferLayout;
- end;
-
- procedure TCustomDBGrid.CMDesignHitTest(var Msg: TCMDesignHitTest);
- var
- MasterCol: TColumn;
- begin
- inherited;
- if (Msg.Result = 1) and ((FDataLink = nil) or
- ((Columns.State = csDefault) and
- (FDataLink.DefaultFields or (not FDataLink.Active)))) then
- Msg.Result := 0
- else if (Msg.Result = 0) and (FDataLink <> nil) and (FDataLink.Active)
- and (Columns.State = csCustomized)
- and PtInExpandButton(Msg.XPos, Msg.YPos, MasterCol) then
- Msg.Result := 1;
- end;
-
- procedure TCustomDBGrid.WMSetCursor(var Msg: TWMSetCursor);
- begin
- if (csDesigning in ComponentState) and
- ((FDataLink = nil) or
- ((Columns.State = csDefault) and
- (FDataLink.DefaultFields or not FDataLink.Active))) then
- Windows.SetCursor(LoadCursor(0, IDC_ARROW))
- else inherited;
- end;
-
- procedure TCustomDBGrid.WMSize(var Message: TWMSize);
- begin
- inherited;
- if UpdateLock = 0 then UpdateRowCount;
- InvalidateTitles;
- end;
-
- procedure TCustomDBGrid.WMVScroll(var Message: TWMVScroll);
- var
- SI: TScrollInfo;
- begin
- if not AcquireFocus then Exit;
- if FDatalink.Active then
- with Message, FDataLink.DataSet do
- case ScrollCode of
- SB_LINEUP: FDataLink.MoveBy(-FDatalink.ActiveRecord - 1);
- SB_LINEDOWN: FDataLink.MoveBy(FDatalink.RecordCount - FDatalink.ActiveRecord);
- SB_PAGEUP: FDataLink.MoveBy(-VisibleRowCount);
- SB_PAGEDOWN: FDataLink.MoveBy(VisibleRowCount);
- SB_THUMBPOSITION:
- begin
- if IsSequenced then
- begin
- SI.cbSize := sizeof(SI);
- SI.fMask := SIF_ALL;
- GetScrollInfo(Self.Handle, SB_VERT, SI);
- if SI.nTrackPos <= 1 then First
- else if SI.nTrackPos >= RecordCount then Last
- else RecNo := SI.nTrackPos;
- end
- else
- case Pos of
- 0: First;
- 1: FDataLink.MoveBy(-VisibleRowCount);
- 2: Exit;
- 3: FDataLink.MoveBy(VisibleRowCount);
- 4: Last;
- end;
- end;
- SB_BOTTOM: Last;
- SB_TOP: First;
- end;
- end;
-
- procedure TCustomDBGrid.SetIme;
- var
- Column: TColumn;
- begin
- if not SysLocale.FarEast then Exit;
- if Columns.Count = 0 then Exit;
-
- ImeName := FOriginalImeName;
- ImeMode := FOriginalImeMode;
- Column := Columns[SelectedIndex];
- if Column.IsImeNameStored then ImeName := Column.ImeName;
- if Column.IsImeModeStored then ImeMode := Column.ImeMode;
-
- if InplaceEditor <> nil then
- begin
- TDBGridInplaceEdit(Self).ImeName := ImeName;
- TDBGridInplaceEdit(Self).ImeMode := ImeMode;
- end;
- end;
-
- procedure TCustomDBGrid.UpdateIme;
- begin
- if not SysLocale.FarEast then Exit;
- SetIme;
- SetImeName(ImeName);
- SetImeMode(Handle, ImeMode);
- end;
-
- procedure TCustomDBGrid.WMIMEStartComp(var Message: TMessage);
- begin
- inherited;
- ShowEditor;
- end;
-
- procedure TCustomDBGrid.WMSetFocus(var Message: TWMSetFocus);
- begin
- if not ((InplaceEditor <> nil) and
- (Message.FocusedWnd = InplaceEditor.Handle)) then SetIme;
- inherited;
- end;
-
- procedure TCustomDBGrid.WMKillFocus(var Message: TMessage);
- begin
- if not SysLocale.FarEast then inherited
- else
- begin
- ImeName := Screen.DefaultIme;
- ImeMode := imDontCare;
- inherited;
- if not ((InplaceEditor <> nil) and
- (HWND(Message.WParam) = InplaceEditor.Handle)) then
- ActivateKeyboardLayout(Screen.DefaultKbLayout, KLF_ACTIVATE);
- end;
- end;
-
- { Defer action processing to datalink }
-
- function TCustomDBGrid.ExecuteAction(Action: TBasicAction): Boolean;
- begin
- Result := (DataLink <> nil) and DataLink.ExecuteAction(Action);
- end;
-
- function TCustomDBGrid.UpdateAction(Action: TBasicAction): Boolean;
- begin
- Result := (DataLink <> nil) and DataLink.UpdateAction(Action);
- end;
-
- procedure TCustomDBGrid.ShowPopupEditor(Column: TColumn; X, Y: Integer);
- var
- SubGrid: TCustomDBGrid;
- DS: TDataSource;
- I: Integer;
- FloatRect: TRect;
- Cmp: TControl;
- begin
- if not ((Column.Field <> nil) and (Column.Field is TDataSetField)) then Exit;
-
- // find existing popup for this column field, if any, and show it
- for I := 0 to ComponentCount-1 do
- if Components[I] is TCustomDBGrid then
- begin
- SubGrid := TCustomDBGrid(Components[I]);
- if (SubGrid.DataSource <> nil) and
- (SubGrid.DataSource.DataSet = (Column.Field as TDatasetField).NestedDataset) and
- SubGrid.CanFocus then
- begin
- SubGrid.Parent.Show;
- SubGrid.SetFocus;
- Exit;
- end;
- end;
-
- // create another instance of this kind of grid
- SubGrid := TCustomDBGrid(TComponentClass(Self.ClassType).Create(Self));
- try
- DS := TDataSource.Create(SubGrid); // incestuous, but easy cleanup
- DS.Dataset := (Column.Field as TDatasetField).NestedDataset;
- DS.DataSet.CheckBrowseMode;
- SubGrid.DataSource := DS;
- SubGrid.Columns.State := Columns.State;
- SubGrid.Columns[0].Expanded := True;
- SubGrid.Visible := False;
- SubGrid.FloatingDockSiteClass := TCustomDockForm;
- FloatRect.TopLeft := ClientToScreen(CellRect(Col, Row).BottomRight);
- if X > Low(Integer) then FloatRect.Left := X;
- if Y > Low(Integer) then FloatRect.Top := Y;
- FloatRect.Right := FloatRect.Left + Width;
- FloatRect.Bottom := FloatRect.Top + Height;
- SubGrid.ManualFloat(FloatRect);
- // SubGrid.ManualDock(nil,nil,alClient);
- SubGrid.Parent.BiDiMode := Self.BiDiMode; { This carries the BiDi setting }
- I := SubGrid.CellRect(SubGrid.ColCount-1, 0).Right;
- if (I > 0) and (I < Screen.Width div 2) then
- SubGrid.Parent.ClientWidth := I
- else
- SubGrid.Parent.Width := Screen.Width div 4;
- SubGrid.Parent.Height := Screen.Height div 4;
- SubGrid.Align := alClient;
- SubGrid.DragKind := dkDock;
- SubGrid.Color := Color;
- SubGrid.Ctl3D := Ctl3D;
- SubGrid.Cursor := Cursor;
- SubGrid.Enabled := Enabled;
- SubGrid.FixedColor := FixedColor;
- SubGrid.Font := Font;
- SubGrid.HelpContext := HelpContext;
- SubGrid.IMEMode := IMEMode;
- SubGrid.IMEName := IMEName;
- SubGrid.Options := Options;
- Cmp := Self;
- while (Cmp <> nil) and (TCustomDBGrid(Cmp).PopupMenu = nil) do
- Cmp := Cmp.Parent;
- if Cmp <> nil then
- SubGrid.PopupMenu := TCustomDBGrid(Cmp).PopupMenu;
- SubGrid.TitleFont := TitleFont;
- SubGrid.Visible := True;
- SubGrid.Parent.Show;
- except
- SubGrid.Free;
- raise;
- end;
- end;
-
- procedure TCustomDBGrid.CalcSizingState(X, Y: Integer;
- var State: TGridState; var Index, SizingPos, SizingOfs: Integer;
- var FixedInfo: TGridDrawInfo);
- var
- R: TGridCoord;
- begin
- inherited CalcSizingState(X, Y, State, Index, SizingPos, SizingOfs, FixedInfo);
- if (State = gsColSizing) and (FDataLink <> nil)
- and (FDatalink.Dataset <> nil) and FDataLink.Dataset.ObjectView then
- begin
- R := MouseCoord(X, Y);
- R.X := RawToDataColumn(R.X);
- if (R.X >= 0) and (R.X < Columns.Count) and (Columns[R.X].Depth > R.Y) then
- State := gsNormal;
- end;
- end;
-
- function TCustomDBGrid.CheckColumnDrag(var Origin, Destination: Integer;
- const MousePt: TPoint): Boolean;
- var
- I, ARow: Integer;
- DestCol: TColumn;
- begin
- Result := inherited CheckColumnDrag(Origin, Destination, MousePt);
- if Result and (FDatalink.Dataset <> nil) and FDatalink.Dataset.ObjectView then
- begin
- assert(FDragCol <> nil);
- ARow := FDragCol.Depth;
- if Destination <> Origin then
- begin
- DestCol := ColumnAtDepth(Columns[RawToDataColumn(Destination)], ARow);
- if DestCol.ParentColumn <> FDragCol.ParentColumn then
- if Destination < Origin then
- DestCol := Columns[FDragCol.ParentColumn.Index+1]
- else
- begin
- I := DestCol.Index;
- while DestCol.ParentColumn <> FDragCol.ParentColumn do
- begin
- Dec(I);
- DestCol := Columns[I];
- end;
- end;
- if (DestCol.Index > FDragCol.Index) then
- begin
- I := DestCol.Index + 1;
- while (I < Columns.Count) and (ColumnAtDepth(Columns[I],ARow) = DestCol) do
- Inc(I);
- DestCol := Columns[I-1];
- end;
- Destination := DataToRawColumn(DestCol.Index);
- end;
- end;
- end;
-
- function TCustomDBGrid.BeginColumnDrag(var Origin, Destination: Integer;
- const MousePt: TPoint): Boolean;
- var
- I, ARow: Integer;
- begin
- Result := inherited BeginColumnDrag(Origin, Destination, MousePt);
- if Result and (FDatalink.Dataset <> nil) and FDatalink.Dataset.ObjectView then
- begin
- ARow := MouseCoord(MousePt.X, MousePt.Y).Y;
- FDragCol := ColumnAtDepth(Columns[RawToDataColumn(Origin)], ARow);
- if FDragCol = nil then Exit;
- I := DataToRawColumn(FDragCol.Index);
- if Origin <> I then Origin := I;
- Destination := Origin;
- end;
- end;
-
- function TCustomDBGrid.EndColumnDrag(var Origin, Destination: Integer;
- const MousePt: TPoint): Boolean;
- begin
- Result := inherited EndColumnDrag(Origin, Destination, MousePt);
- FDragCol := nil;
- end;
-
- procedure TCustomDBGrid.InvalidateTitles;
- var
- R: TRect;
- DrawInfo: TGridDrawInfo;
- begin
- if HandleAllocated and (dgTitles in Options) then
- begin
- CalcFixedInfo(DrawInfo);
- R := Rect(0, 0, Width, DrawInfo.Vert.FixedBoundary);
- InvalidateRect(Handle, @R, False);
- end;
- end;
-
- procedure TCustomDBGrid.TopLeftChanged;
- begin
- InvalidateTitles;
- inherited TopLeftChanged;
- end;
-
- end.
-