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-
- {*******************************************************}
- { }
- { Delphi Visual Component Library }
- { }
- { Copyright (c) 1995,96 Borland International }
- { }
- {*******************************************************}
-
- unit DBCtrls;
-
- {$R-}
-
- interface
-
- uses SysUtils, Windows, Messages, Classes, Controls, Forms,
- Graphics, Menus, StdCtrls, ExtCtrls, DB, DBTables, Mask, Buttons;
-
- type
-
- { TPaintControl }
-
- TPaintControl = class
- private
- FOwner: TWinControl;
- FClassName: string;
- FHandle: HWnd;
- FObjectInstance: Pointer;
- FDefWindowProc: Pointer;
- FCtl3dButton: Boolean;
- function GetHandle: HWnd;
- procedure SetCtl3DButton(Value: Boolean);
- procedure WndProc(var Message: TMessage);
- public
- constructor Create(Owner: TWinControl; const ClassName: string);
- destructor Destroy; override;
- procedure DestroyHandle;
- property Ctl3DButton: Boolean read FCtl3dButton write SetCtl3dButton;
- property Handle: HWnd read GetHandle;
- end;
-
- { TDBEdit }
-
- TDBEdit = class(TCustomMaskEdit)
- private
- FDataLink: TFieldDataLink;
- FCanvas: TControlCanvas;
- FAlignment: TAlignment;
- FFocused: Boolean;
- procedure DataChange(Sender: TObject);
- procedure EditingChange(Sender: TObject);
- function GetDataField: string;
- function GetDataSource: TDataSource;
- function GetField: TField;
- function GetReadOnly: Boolean;
- function GetTextMargins: TPoint;
- procedure SetDataField(const Value: string);
- procedure SetDataSource(Value: TDataSource);
- procedure SetFocused(Value: Boolean);
- procedure SetReadOnly(Value: Boolean);
- procedure UpdateData(Sender: TObject);
- procedure WMCut(var Message: TMessage); message WM_CUT;
- procedure WMPaste(var Message: TMessage); message WM_PASTE;
- procedure CMEnter(var Message: TCMEnter); message CM_ENTER;
- procedure CMExit(var Message: TCMExit); message CM_EXIT;
- procedure WMPaint(var Message: TWMPaint); message WM_PAINT;
- procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
- protected
- procedure Change; override;
- function EditCanModify: Boolean; override;
- procedure KeyDown(var Key: Word; Shift: TShiftState); override;
- procedure KeyPress(var Key: Char); override;
- procedure Notification(AComponent: TComponent;
- Operation: TOperation); override;
- procedure Reset; override;
- public
- constructor Create(AOwner: TComponent); override;
- destructor Destroy; override;
- property Field: TField read GetField;
- published
- property AutoSelect;
- property AutoSize;
- property BorderStyle;
- property CharCase;
- property Color;
- property Ctl3D;
- property DataField: string read GetDataField write SetDataField;
- property DataSource: TDataSource read GetDataSource write SetDataSource;
- property DragCursor;
- property DragMode;
- property Enabled;
- property Font;
- property MaxLength;
- property ParentColor;
- property ParentCtl3D;
- property ParentFont;
- property ParentShowHint;
- property PasswordChar;
- property PopupMenu;
- property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
- property ShowHint;
- property TabOrder;
- property TabStop;
- property Visible;
- property OnChange;
- property OnClick;
- property OnDblClick;
- property OnDragDrop;
- property OnDragOver;
- property OnEndDrag;
- property OnEnter;
- property OnExit;
- property OnKeyDown;
- property OnKeyPress;
- property OnKeyUp;
- property OnMouseDown;
- property OnMouseMove;
- property OnMouseUp;
- property OnStartDrag;
- end;
-
- { TDBText }
-
- TDBText = class(TCustomLabel)
- private
- FDataLink: TFieldDataLink;
- procedure DataChange(Sender: TObject);
- function GetDataField: string;
- function GetDataSource: TDataSource;
- function GetField: TField;
- function GetFieldText: string;
- procedure SetDataField(const Value: string);
- procedure SetDataSource(Value: TDataSource);
- procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
- protected
- function GetLabelText: string; override;
- procedure Notification(AComponent: TComponent;
- Operation: TOperation); override;
- procedure SetAutoSize(Value: Boolean); override;
- public
- constructor Create(AOwner: TComponent); override;
- destructor Destroy; override;
- property Field: TField read GetField;
- published
- property Align;
- property Alignment;
- property AutoSize default False;
- property Color;
- property DataField: string read GetDataField write SetDataField;
- property DataSource: TDataSource read GetDataSource write SetDataSource;
- property DragCursor;
- property DragMode;
- property Enabled;
- property Font;
- property ParentColor;
- property ParentFont;
- property ParentShowHint;
- property PopupMenu;
- property Transparent;
- property ShowHint;
- property Visible;
- property WordWrap;
- property OnClick;
- property OnDblClick;
- property OnDragDrop;
- property OnDragOver;
- property OnEndDrag;
- property OnMouseDown;
- property OnMouseMove;
- property OnMouseUp;
- property OnStartDrag;
- end;
-
- { TDBCheckBox }
-
- TDBCheckBox = class(TCustomCheckBox)
- private
- FDataLink: TFieldDataLink;
- FValueCheck: string;
- FValueUncheck: string;
- FPaintControl: TPaintControl;
- procedure DataChange(Sender: TObject);
- function GetDataField: string;
- function GetDataSource: TDataSource;
- function GetField: TField;
- function GetFieldState: TCheckBoxState;
- function GetReadOnly: Boolean;
- procedure SetDataField(const Value: string);
- procedure SetDataSource(Value: TDataSource);
- procedure SetReadOnly(Value: Boolean);
- procedure SetValueCheck(const Value: string);
- procedure SetValueUncheck(const Value: string);
- procedure UpdateData(Sender: TObject);
- function ValueMatch(const ValueList, Value: string): Boolean;
- procedure WMPaint(var Message: TWMPaint); message WM_PAINT;
- procedure CMExit(var Message: TCMExit); message CM_EXIT;
- procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
- protected
- procedure Toggle; override;
- procedure KeyPress(var Key: Char); override;
- procedure Notification(AComponent: TComponent;
- Operation: TOperation); override;
- procedure WndProc(var Message: TMessage); override;
- public
- constructor Create(AOwner: TComponent); override;
- destructor Destroy; override;
- property Checked;
- property Field: TField read GetField;
- property State;
- published
- property Alignment;
- property AllowGrayed;
- property Caption;
- property Color;
- property Ctl3D;
- property DataField: string read GetDataField write SetDataField;
- property DataSource: TDataSource read GetDataSource write SetDataSource;
- property DragCursor;
- property DragMode;
- property Enabled;
- property Font;
- property ParentColor;
- property ParentCtl3D;
- property ParentFont;
- property ParentShowHint;
- property PopupMenu;
- property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
- property ShowHint;
- property TabOrder;
- property TabStop;
- property ValueChecked: string read FValueCheck write SetValueCheck;
- property ValueUnchecked: string read FValueUncheck write SetValueUncheck;
- property Visible;
- property OnClick;
- property OnDragDrop;
- property OnDragOver;
- property OnEndDrag;
- property OnEnter;
- property OnExit;
- property OnKeyDown;
- property OnKeyPress;
- property OnKeyUp;
- property OnMouseDown;
- property OnMouseMove;
- property OnMouseUp;
- property OnStartDrag;
- end;
-
- { TDBComboBox }
-
- TDBComboBox = class(TCustomComboBox)
- private
- FDataLink: TFieldDataLink;
- FPaintControl: TPaintControl;
- procedure DataChange(Sender: TObject);
- procedure EditingChange(Sender: TObject);
- function GetComboText: string;
- function GetDataField: string;
- function GetDataSource: TDataSource;
- function GetField: TField;
- function GetReadOnly: Boolean;
- procedure SetComboText(const Value: string);
- procedure SetDataField(const Value: string);
- procedure SetDataSource(Value: TDataSource);
- procedure SetEditReadOnly;
- procedure SetItems(Value: TStrings);
- procedure SetReadOnly(Value: Boolean);
- procedure UpdateData(Sender: TObject);
- procedure CMExit(var Message: TCMExit); message CM_EXIT;
- procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
- procedure WMPaint(var Message: TWMPaint); message WM_PAINT;
- protected
- procedure Change; override;
- procedure Click; override;
- procedure ComboWndProc(var Message: TMessage; ComboWnd: HWnd;
- ComboProc: Pointer); override;
- procedure CreateWnd; override;
- procedure DropDown; override;
- procedure KeyDown(var Key: Word; Shift: TShiftState); override;
- procedure KeyPress(var Key: Char); override;
- procedure Notification(AComponent: TComponent;
- Operation: TOperation); override;
- procedure SetStyle(Value: TComboboxStyle); override;
- procedure WndProc(var Message: TMessage); override;
- public
- constructor Create(AOwner: TComponent); override;
- destructor Destroy; override;
- property Field: TField read GetField;
- property Text;
- published
- property Style; {Must be published before Items}
- property Color;
- property Ctl3D;
- property DataField: string read GetDataField write SetDataField;
- property DataSource: TDataSource read GetDataSource write SetDataSource;
- property DragMode;
- property DragCursor;
- property DropDownCount;
- property Enabled;
- property Font;
- property ItemHeight;
- property Items write SetItems;
- property ParentColor;
- property ParentCtl3D;
- property ParentFont;
- property ParentShowHint;
- property PopupMenu;
- property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
- property ShowHint;
- property Sorted;
- property TabOrder;
- property TabStop;
- property Visible;
- property OnChange;
- property OnClick;
- property OnDblClick;
- property OnDragDrop;
- property OnDragOver;
- property OnDrawItem;
- property OnDropDown;
- property OnEndDrag;
- property OnEnter;
- property OnExit;
- property OnKeyDown;
- property OnKeyPress;
- property OnKeyUp;
- property OnMeasureItem;
- property OnStartDrag;
- end;
-
- { TDBListBox }
-
- TDBListBox = class(TCustomListBox)
- private
- FDataLink: TFieldDataLink;
- procedure DataChange(Sender: TObject);
- procedure UpdateData(Sender: TObject);
- function GetDataField: string;
- function GetDataSource: TDataSource;
- function GetField: TField;
- function GetReadOnly: Boolean;
- procedure SetDataField(const Value: string);
- procedure SetDataSource(Value: TDataSource);
- procedure SetReadOnly(Value: Boolean);
- procedure SetItems(Value: TStrings);
- procedure WMLButtonDown(var Message: TWMLButtonDown); message WM_LBUTTONDOWN;
- procedure CMExit(var Message: TCMExit); message CM_EXIT;
- protected
- procedure Click; override;
- procedure KeyDown(var Key: Word; Shift: TShiftState); override;
- procedure KeyPress(var Key: Char); override;
- procedure Notification(AComponent: TComponent;
- Operation: TOperation); override;
- public
- constructor Create(AOwner: TComponent); override;
- destructor Destroy; override;
- property Field: TField read GetField;
- published
- property Align;
- property BorderStyle;
- property Color;
- property Ctl3D default True;
- property DataField: string read GetDataField write SetDataField;
- property DataSource: TDataSource read GetDataSource write SetDataSource;
- property DragCursor;
- property DragMode;
- property Enabled;
- property Font;
- property IntegralHeight;
- property ItemHeight;
- property Items write SetItems;
- property ParentColor;
- property ParentCtl3D;
- property ParentFont;
- property ParentShowHint;
- property PopupMenu;
- property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
- property ShowHint;
- property Style;
- property TabOrder;
- property TabStop;
- property Visible;
- property OnClick;
- property OnDblClick;
- property OnDragDrop;
- property OnDragOver;
- property OnDrawItem;
- property OnEndDrag;
- property OnEnter;
- property OnExit;
- property OnKeyDown;
- property OnKeyPress;
- property OnKeyUp;
- property OnMeasureItem;
- property OnMouseDown;
- property OnMouseMove;
- property OnMouseUp;
- property OnStartDrag;
- end;
-
- { TDBRadioGroup }
-
- TDBRadioGroup = class(TCustomRadioGroup)
- private
- FDataLink: TFieldDataLink;
- FValue: string;
- FValues: TStrings;
- FInSetValue: Boolean;
- FOnChange: TNotifyEvent;
- procedure DataChange(Sender: TObject);
- procedure UpdateData(Sender: TObject);
- function GetDataField: string;
- function GetDataSource: TDataSource;
- function GetField: TField;
- function GetReadOnly: Boolean;
- function GetButtonValue(Index: Integer): string;
- procedure SetDataField(const Value: string);
- procedure SetDataSource(Value: TDataSource);
- procedure SetReadOnly(Value: Boolean);
- procedure SetValue(const Value: string);
- procedure SetItems(Value: TStrings);
- procedure SetValues(Value: TStrings);
- procedure CMExit(var Message: TCMExit); message CM_EXIT;
- protected
- procedure Change; dynamic;
- procedure Click; override;
- procedure KeyPress(var Key: Char); override;
- function CanModify: Boolean; override;
- procedure Notification(AComponent: TComponent;
- Operation: TOperation); override;
- property DataLink: TFieldDataLink read FDataLink;
- public
- constructor Create(AOwner: TComponent); override;
- destructor Destroy; override;
- property Field: TField read GetField;
- property ItemIndex;
- property Value: string read FValue write SetValue;
- published
- property Align;
- property Caption;
- property Color;
- property Columns;
- property Ctl3D;
- property DataField: string read GetDataField write SetDataField;
- property DataSource: TDataSource read GetDataSource write SetDataSource;
- property DragCursor;
- property DragMode;
- property Enabled;
- property Font;
- property Items write SetItems;
- property ParentColor;
- property ParentCtl3D;
- property ParentFont;
- property ParentShowHint;
- property PopupMenu;
- property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
- property ShowHint;
- property TabOrder;
- property TabStop;
- property Values: TStrings read FValues write SetValues;
- property Visible;
- property OnChange: TNotifyEvent read FOnChange write FOnChange;
- property OnClick;
- property OnDragDrop;
- property OnDragOver;
- property OnEndDrag;
- property OnEnter;
- property OnExit;
- property OnStartDrag;
- end;
-
- { TDBMemo }
-
- TDBMemo = class(TCustomMemo)
- private
- FDataLink: TFieldDataLink;
- FAutoDisplay: Boolean;
- FFocused: Boolean;
- FMemoLoaded: Boolean;
- FPaintControl: TPaintControl;
- procedure DataChange(Sender: TObject);
- procedure EditingChange(Sender: TObject);
- function GetDataField: string;
- function GetDataSource: TDataSource;
- function GetField: TField;
- function GetReadOnly: Boolean;
- procedure SetDataField(const Value: string);
- procedure SetDataSource(Value: TDataSource);
- procedure SetReadOnly(Value: Boolean);
- procedure SetAutoDisplay(Value: Boolean);
- procedure SetFocused(Value: Boolean);
- procedure UpdateData(Sender: TObject);
- procedure WMCut(var Message: TMessage); message WM_CUT;
- procedure WMPaste(var Message: TMessage); message WM_PASTE;
- procedure CMEnter(var Message: TCMEnter); message CM_ENTER;
- procedure CMExit(var Message: TCMExit); message CM_EXIT;
- procedure WMLButtonDblClk(var Message: TWMLButtonDblClk); message WM_LBUTTONDBLCLK;
- procedure WMPaint(var Message: TWMPaint); message WM_PAINT;
- procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
- protected
- procedure Change; override;
- procedure KeyDown(var Key: Word; Shift: TShiftState); override;
- procedure KeyPress(var Key: Char); override;
- procedure Notification(AComponent: TComponent;
- Operation: TOperation); override;
- procedure WndProc(var Message: TMessage); override;
- public
- constructor Create(AOwner: TComponent); override;
- destructor Destroy; override;
- procedure LoadMemo;
- property Field: TField read GetField;
- published
- property Align;
- property Alignment;
- property AutoDisplay: Boolean read FAutoDisplay write SetAutoDisplay default True;
- property BorderStyle;
- property Color;
- property Ctl3D;
- property DataField: string read GetDataField write SetDataField;
- property DataSource: TDataSource read GetDataSource write SetDataSource;
- property DragCursor;
- property DragMode;
- property Enabled;
- property Font;
- property MaxLength;
- property ParentColor;
- property ParentCtl3D;
- property ParentFont;
- property ParentShowHint;
- property PopupMenu;
- property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
- property ScrollBars;
- property ShowHint;
- property TabOrder;
- property TabStop;
- property Visible;
- property WantTabs;
- property WordWrap;
- property OnChange;
- property OnClick;
- property OnDblClick;
- property OnDragDrop;
- property OnDragOver;
- property OnEndDrag;
- property OnEnter;
- property OnExit;
- property OnKeyDown;
- property OnKeyPress;
- property OnKeyUp;
- property OnMouseDown;
- property OnMouseMove;
- property OnMouseUp;
- property OnStartDrag;
- end;
-
- { TDBImage }
-
- TDBImage = class(TCustomControl)
- private
- FDataLink: TFieldDataLink;
- FPicture: TPicture;
- FBorderStyle: TBorderStyle;
- FAutoDisplay: Boolean;
- FStretch: Boolean;
- FCenter: Boolean;
- FPictureLoaded: Boolean;
- FQuickDraw: Boolean;
- procedure DataChange(Sender: TObject);
- function GetDataField: string;
- function GetDataSource: TDataSource;
- function GetField: TField;
- function GetReadOnly: Boolean;
- procedure PictureChanged(Sender: TObject);
- procedure SetAutoDisplay(Value: Boolean);
- procedure SetBorderStyle(Value: TBorderStyle);
- procedure SetCenter(Value: Boolean);
- procedure SetDataField(const Value: string);
- procedure SetDataSource(Value: TDataSource);
- procedure SetPicture(Value: TPicture);
- procedure SetReadOnly(Value: Boolean);
- procedure SetStretch(Value: Boolean);
- procedure UpdateData(Sender: TObject);
- procedure CMEnter(var Message: TCMEnter); message CM_ENTER;
- procedure CMExit(var Message: TCMExit); message CM_EXIT;
- procedure WMLButtonDown(var Message: TWMLButtonDown); message WM_LBUTTONDOWN;
- procedure WMLButtonDblClk(var Message: TWMLButtonDblClk); message WM_LBUTTONDBLCLK;
- procedure WMCut(var Message: TMessage); message WM_CUT;
- procedure WMCopy(var Message: TMessage); message WM_COPY;
- procedure WMPaste(var Message: TMessage); message WM_PASTE;
- procedure CMTextChanged(var Message: TMessage); message CM_TEXTCHANGED;
- protected
- procedure CreateParams(var Params: TCreateParams); override;
- function GetPalette: HPALETTE; override;
- procedure KeyDown(var Key: Word; Shift: TShiftState); override;
- procedure KeyPress(var Key: Char); override;
- procedure Notification(AComponent: TComponent;
- Operation: TOperation); override;
- procedure Paint; override;
- public
- constructor Create(AOwner: TComponent); override;
- destructor Destroy; override;
- procedure CopyToClipboard;
- procedure CutToClipboard;
- procedure LoadPicture;
- procedure PasteFromClipboard;
- property Field: TField read GetField;
- property Picture: TPicture read FPicture write SetPicture;
- published
- property Align;
- property AutoDisplay: Boolean read FAutoDisplay write SetAutoDisplay default True;
- property BorderStyle: TBorderStyle read FBorderStyle write SetBorderStyle default bsSingle;
- property Center: Boolean read FCenter write SetCenter default True;
- property Color;
- property Ctl3D;
- property DataField: string read GetDataField write SetDataField;
- property DataSource: TDataSource read GetDataSource write SetDataSource;
- property DragCursor;
- property DragMode;
- property Enabled;
- property Font;
- property ParentColor default False;
- property ParentCtl3D;
- property ParentFont;
- property ParentShowHint;
- property PopupMenu;
- property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
- property QuickDraw: Boolean read FQuickDraw write FQuickDraw default True;
- property ShowHint;
- property Stretch: Boolean read FStretch write SetStretch default False;
- property TabOrder;
- property TabStop default True;
- property Visible;
- property OnClick;
- property OnDblClick;
- property OnDragDrop;
- property OnDragOver;
- property OnEndDrag;
- property OnEnter;
- property OnExit;
- property OnKeyDown;
- property OnKeyPress;
- property OnKeyUp;
- property OnMouseDown;
- property OnMouseMove;
- property OnMouseUp;
- property OnStartDrag;
- end;
-
- const
- InitRepeatPause = 400; { pause before repeat timer (ms) }
- RepeatPause = 100; { pause before hint window displays (ms)}
- SpaceSize = 5; { size of space between special buttons }
-
- type
- TNavButton = class;
- TNavDataLink = class;
-
- TNavGlyph = (ngEnabled, ngDisabled);
- TNavigateBtn = (nbFirst, nbPrior, nbNext, nbLast,
- nbInsert, nbDelete, nbEdit, nbPost, nbCancel, nbRefresh);
- TButtonSet = set of TNavigateBtn;
- TNavButtonStyle = set of (nsAllowTimer, nsFocusRect);
-
- ENavClick = procedure (Sender: TObject; Button: TNavigateBtn) of object;
-
- { TDBNavigator }
-
- TDBNavigator = class (TCustomPanel)
- private
- FDataLink: TNavDataLink;
- FVisibleButtons: TButtonSet;
- FHints: TStrings;
- ButtonWidth: Integer;
- MinBtnSize: TPoint;
- FOnNavClick: ENavClick;
- FocusedButton: TNavigateBtn;
- FConfirmDelete: Boolean;
- function GetDataSource: TDataSource;
- procedure SetDataSource(Value: TDataSource);
- procedure InitButtons;
- procedure InitHints;
- procedure Click(Sender: TObject);
- procedure BtnMouseDown (Sender: TObject; Button: TMouseButton;
- Shift: TShiftState; X, Y: Integer);
- procedure SetVisible(Value: TButtonSet);
- procedure AdjustSize (var W: Integer; var H: Integer);
- procedure SetHints(Value: TStrings);
- procedure WMSize(var Message: TWMSize); message WM_SIZE;
- procedure WMSetFocus(var Message: TWMSetFocus); message WM_SETFOCUS;
- procedure WMKillFocus(var Message: TWMKillFocus); message WM_KILLFOCUS;
- procedure WMGetDlgCode(var Message: TWMGetDlgCode); message WM_GETDLGCODE;
- procedure CMEnabledChanged(var Message: TMessage); message CM_ENABLEDCHANGED;
- protected
- Buttons: array[TNavigateBtn] of TNavButton;
- procedure DataChanged;
- procedure EditingChanged;
- procedure ActiveChanged;
- procedure Loaded; override;
- procedure KeyDown(var Key: Word; Shift: TShiftState); override;
- procedure Notification(AComponent: TComponent;
- Operation: TOperation); override;
- procedure GetChildren(Proc: TGetChildProc); override;
- public
- constructor Create(AOwner: TComponent); override;
- destructor Destroy; override;
- procedure SetBounds(ALeft, ATop, AWidth, AHeight: Integer); override;
- procedure BtnClick(Index: TNavigateBtn);
- published
- property DataSource: TDataSource read GetDataSource write SetDataSource;
- property VisibleButtons: TButtonSet read FVisibleButtons write SetVisible
- default [nbFirst, nbPrior, nbNext, nbLast, nbInsert, nbDelete,
- nbEdit, nbPost, nbCancel, nbRefresh];
- property Align;
- property DragCursor;
- property DragMode;
- property Enabled;
- property Ctl3D;
- property Hints: TStrings read FHints write SetHints;
- property ParentCtl3D;
- property ParentShowHint;
- property PopupMenu;
- property ConfirmDelete: Boolean read FConfirmDelete write FConfirmDelete default True;
- property ShowHint;
- property TabOrder;
- property TabStop;
- property Visible;
- property OnClick: ENavClick read FOnNavClick write FOnNavClick;
- property OnDblClick;
- property OnDragDrop;
- property OnDragOver;
- property OnEndDrag;
- property OnEnter;
- property OnExit;
- property OnResize;
- property OnStartDrag;
- end;
-
- { TNavButton }
-
- TNavButton = class(TSpeedButton)
- private
- FIndex: TNavigateBtn;
- FNavStyle: TNavButtonStyle;
- FRepeatTimer: TTimer;
- procedure TimerExpired(Sender: TObject);
- protected
- procedure Paint; override;
- procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer); override;
- procedure MouseUp(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer); override;
- public
- destructor Destroy; override;
- property NavStyle: TNavButtonStyle read FNavStyle write FNavStyle;
- property Index : TNavigateBtn read FIndex write FIndex;
- end;
-
- { TNavDataLink }
-
- TNavDataLink = class(TDataLink)
- private
- FNavigator: TDBNavigator;
- protected
- procedure EditingChanged; override;
- procedure DataSetChanged; override;
- procedure ActiveChanged; override;
- public
- constructor Create(ANav: TDBNavigator);
- destructor Destroy; override;
- end;
-
- { TDBLookupControl }
-
- TDBLookupControl = class;
-
- TDataSourceLink = class(TDataLink)
- private
- FDBLookupControl: TDBLookupControl;
- protected
- procedure ActiveChanged; override;
- procedure RecordChanged(Field: TField); override;
- end;
-
- TListSourceLink = class(TDataLink)
- private
- FDBLookupControl: TDBLookupControl;
- protected
- procedure ActiveChanged; override;
- procedure DataSetChanged; override;
- end;
-
- TDBLookupControl = class(TCustomControl)
- private
- FLookupSource: TDataSource;
- FDataLink: TDataSourceLink;
- FListLink: TListSourceLink;
- FDataFieldName: string;
- FKeyFieldName: string;
- FListFieldName: string;
- FListFieldIndex: Integer;
- FDataField: TField;
- FMasterField: TField;
- FKeyField: TField;
- FListField: TField;
- FListFields: TList;
- FKeyValue: Variant;
- FSearchText: string;
- FLookupMode: Boolean;
- FListActive: Boolean;
- FFocused: Boolean;
- function CanModify: Boolean;
- procedure CheckNotCircular;
- procedure CheckNotLookup;
- procedure DataLinkActiveChanged;
- procedure DataLinkRecordChanged(Field: TField);
- function GetBorderSize: Integer;
- function GetDataSource: TDataSource;
- function GetKeyFieldName: string;
- function GetListSource: TDataSource;
- function GetReadOnly: Boolean;
- function GetTextHeight: Integer;
- procedure KeyValueChanged; virtual;
- procedure ListLinkActiveChanged; virtual;
- procedure ListLinkDataChanged; virtual;
- function LocateKey: Boolean;
- procedure ProcessSearchKey(Key: Char);
- procedure SelectKeyValue(const Value: Variant);
- procedure SetDataFieldName(const Value: string);
- procedure SetDataSource(Value: TDataSource);
- procedure SetKeyFieldName(const Value: string);
- procedure SetKeyValue(const Value: Variant);
- procedure SetListFieldName(const Value: string);
- procedure SetListSource(Value: TDataSource);
- procedure SetLookupMode(Value: Boolean);
- procedure SetReadOnly(Value: Boolean);
- procedure WMGetDlgCode(var Message: TMessage); message WM_GETDLGCODE;
- procedure WMKillFocus(var Message: TMessage); message WM_KILLFOCUS;
- procedure WMSetFocus(var Message: TMessage); message WM_SETFOCUS;
- protected
- procedure Notification(AComponent: TComponent;
- Operation: TOperation); override;
- property DataField: string read FDataFieldName write SetDataFieldName;
- property DataSource: TDataSource read GetDataSource write SetDataSource;
- property KeyField: string read GetKeyFieldName write SetKeyFieldName;
- property KeyValue: Variant read FKeyValue write SetKeyValue;
- property ListField: string read FListFieldName write SetListFieldName;
- property ListFieldIndex: Integer read FListFieldIndex write FListFieldIndex default 0;
- property ListSource: TDataSource read GetListSource write SetListSource;
- property ParentColor default False;
- property ReadOnly: Boolean read GetReadOnly write SetReadOnly default False;
- property TabStop default True;
- public
- constructor Create(AOwner: TComponent); override;
- destructor Destroy; override;
- end;
-
- { TDBLookupListBox }
-
- TDBLookupListBox = class(TDBLookupControl)
- private
- FRecordIndex: Integer;
- FRecordCount: Integer;
- FRowCount: Integer;
- FBorderStyle: TBorderStyle;
- FPopup: Boolean;
- FKeySelected: Boolean;
- FTracking: Boolean;
- FTimerActive: Boolean;
- FLockPosition: Boolean;
- FMousePos: Integer;
- function GetKeyIndex: Integer;
- procedure KeyValueChanged; override;
- procedure ListLinkActiveChanged; override;
- procedure ListLinkDataChanged; override;
- procedure SelectCurrent;
- procedure SelectItemAt(X, Y: Integer);
- procedure SetBorderStyle(Value: TBorderStyle);
- procedure SetRowCount(Value: Integer);
- procedure StopTimer;
- procedure StopTracking;
- procedure TimerScroll;
- procedure UpdateScrollBar;
- procedure CMCtl3DChanged(var Message: TMessage); message CM_CTL3DCHANGED;
- procedure CMFontChanged(var Message: TMessage); message CM_FONTCHANGED;
- procedure WMCancelMode(var Message: TMessage); message WM_CANCELMODE;
- procedure WMTimer(var Message: TMessage); message WM_TIMER;
- procedure WMVScroll(var Message: TWMVScroll); message WM_VSCROLL;
- protected
- procedure CreateParams(var Params: TCreateParams); override;
- procedure CreateWnd; override;
- procedure KeyDown(var Key: Word; Shift: TShiftState); override;
- procedure KeyPress(var Key: Char); 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 Paint; override;
- procedure SetBounds(ALeft, ATop, AWidth, AHeight: Integer); override;
- public
- constructor Create(AOwner: TComponent); override;
- property KeyValue;
- published
- property Align;
- property BorderStyle: TBorderStyle read FBorderStyle write SetBorderStyle default bsSingle;
- property Color;
- property Ctl3D;
- property DataField;
- property DataSource;
- property DragCursor;
- property DragMode;
- property Enabled;
- property Font;
- property KeyField;
- property ListField;
- property ListFieldIndex;
- property ListSource;
- property ParentColor;
- property ParentCtl3D;
- property ParentFont;
- property ParentShowHint;
- property PopupMenu;
- property ReadOnly;
- property RowCount: Integer read FRowCount write SetRowCount stored False;
- property ShowHint;
- property TabOrder;
- property TabStop;
- property Visible;
- property OnClick;
- property OnDblClick;
- property OnDragDrop;
- property OnDragOver;
- property OnEndDrag;
- property OnEnter;
- property OnExit;
- property OnKeyDown;
- property OnKeyPress;
- property OnKeyUp;
- property OnMouseDown;
- property OnMouseMove;
- property OnMouseUp;
- property OnStartDrag;
- end;
-
- { TDBLookupComboBox }
-
- TPopupDataList = class(TDBLookupListBox)
- private
- procedure WMMouseActivate(var Message: TMessage); message WM_MOUSEACTIVATE;
- protected
- procedure CreateParams(var Params: TCreateParams); override;
- public
- constructor Create(AOwner: TComponent); override;
- end;
-
- TDropDownAlign = (daLeft, daRight, daCenter);
-
- TDBLookupComboBox = class(TDBLookupControl)
- private
- FDataList: TPopupDataList;
- FButtonWidth: Integer;
- FText: string;
- FDropDownRows: Integer;
- FDropDownWidth: Integer;
- FDropDownAlign: TDropDownAlign;
- FListVisible: Boolean;
- FPressed: Boolean;
- FTracking: Boolean;
- FAlignment: TAlignment;
- FLookupMode: Boolean;
- FOnDropDown: TNotifyEvent;
- FOnCloseUp: TNotifyEvent;
- procedure KeyValueChanged; override;
- procedure ListLinkActiveChanged; override;
- procedure ListMouseUp(Sender: TObject; Button: TMouseButton;
- Shift: TShiftState; X, Y: Integer);
- procedure StopTracking;
- procedure TrackButton(X, Y: Integer);
- procedure CMCancelMode(var Message: TCMCancelMode); message CM_CANCELMODE;
- procedure CMCtl3DChanged(var Message: TMessage); message CM_CTL3DCHANGED;
- procedure CMFontChanged(var Message: TMessage); message CM_FONTCHANGED;
- procedure CMGetDataLink(var Message: TMessage); message CM_GETDATALINK;
- procedure WMCancelMode(var Message: TMessage); message WM_CANCELMODE;
- procedure WMKillFocus(var Message: TWMKillFocus); message WM_KILLFOCUS;
- protected
- procedure CreateParams(var Params: TCreateParams); override;
- procedure Paint; override;
- procedure KeyDown(var Key: Word; Shift: TShiftState); override;
- procedure KeyPress(var Key: Char); 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 SetBounds(ALeft, ATop, AWidth, AHeight: Integer); override;
- public
- constructor Create(AOwner: TComponent); override;
- procedure CloseUp(Accept: Boolean);
- procedure DropDown;
- property KeyValue;
- property ListVisible: Boolean read FListVisible;
- property Text: string read FText;
- published
- property Color;
- property Ctl3D;
- property DataField;
- property DataSource;
- property DragCursor;
- property DragMode;
- property DropDownAlign: TDropDownAlign read FDropDownAlign write FDropDownAlign default daLeft;
- property DropDownRows: Integer read FDropDownRows write FDropDownRows default 7;
- property DropDownWidth: Integer read FDropDownWidth write FDropDownWidth default 0;
- property Enabled;
- property Font;
- property KeyField;
- property ListField;
- property ListFieldIndex;
- property ListSource;
- property ParentColor;
- property ParentCtl3D;
- property ParentFont;
- property ParentShowHint;
- property PopupMenu;
- property ReadOnly;
- property ShowHint;
- property TabOrder;
- property TabStop;
- property Visible;
- property OnClick;
- property OnCloseUp: TNotifyEvent read FOnCloseUp write FOnCloseUp;
- property OnDragDrop;
- property OnDragOver;
- property OnDropDown: TNotifyEvent read FOnDropDown write FOnDropDown;
- property OnEndDrag;
- property OnEnter;
- property OnExit;
- property OnKeyDown;
- property OnKeyPress;
- property OnKeyUp;
- property OnMouseDown;
- property OnMouseMove;
- property OnMouseUp;
- property OnStartDrag;
- end;
-
- implementation
-
- uses BDE, Clipbrd, DBConsts, Dialogs;
-
- {$R DBCTRLS}
-
- { TPaintControl }
-
- type
- TWinControlAccess = class(TWinControl);
-
- constructor TPaintControl.Create(Owner: TWinControl; const ClassName: string);
- begin
- FOwner := Owner;
- FClassName := ClassName;
- end;
-
- destructor TPaintControl.Destroy;
- begin
- DestroyHandle;
- end;
-
- procedure TPaintControl.DestroyHandle;
- begin
- if FHandle <> 0 then DestroyWindow(FHandle);
- FreeObjectInstance(FObjectInstance);
- FHandle := 0;
- FObjectInstance := nil;
- end;
-
- function TPaintControl.GetHandle: HWnd;
- var
- Params: TCreateParams;
- begin
- if FHandle = 0 then
- begin
- FObjectInstance := MakeObjectInstance(WndProc);
- TWinControlAccess(FOwner).CreateParams(Params);
- with Params do
- FHandle := CreateWindowEx(ExStyle, PChar(FClassName),
- PChar(TWinControlAccess(FOwner).Text), Style or WS_VISIBLE,
- X, Y, Width, Height, Application.Handle, 0, HInstance, nil);
- if FCtl3DButton and TWinControlAccess(FOwner).Ctl3D
- and not NewStyleControls then
- Subclass3DWnd(FHandle);
- FDefWindowProc := Pointer(GetWindowLong(FHandle, GWL_WNDPROC));
- SetWindowLong(FHandle, GWL_WNDPROC, Integer(FObjectInstance));
- SendMessage(FHandle, WM_SETFONT,
- TWinControlAccess(FOwner).Font.Handle, 1);
- end;
- Result := FHandle;
- end;
-
- procedure TPaintControl.SetCtl3DButton(Value: Boolean);
- begin
- if FHandle <> 0 then DestroyHandle;
- FCtl3DButton := Value;
- end;
-
- procedure TPaintControl.WndProc(var Message: TMessage);
- begin
- with Message do
- if (Msg >= CN_CTLCOLORMSGBOX) and (Msg <= CN_CTLCOLORSTATIC) then
- Result := FOwner.Perform(Msg, WParam, LParam) else
- Result := CallWindowProc(FDefWindowProc, FHandle, Msg, WParam, LParam);
- end;
-
- { TDBEdit }
-
- constructor TDBEdit.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- inherited ReadOnly := True;
- ControlStyle := ControlStyle + [csReplicatable];
- FDataLink := TFieldDataLink.Create;
- FDataLink.Control := Self;
- FDataLink.OnDataChange := DataChange;
- FDataLink.OnEditingChange := EditingChange;
- FDataLink.OnUpdateData := UpdateData;
- end;
-
- destructor TDBEdit.Destroy;
- begin
- FDataLink.Free;
- FDataLink := nil;
- FCanvas.Free;
- inherited Destroy;
- end;
-
- procedure TDBEdit.Notification(AComponent: TComponent;
- Operation: TOperation);
- begin
- inherited Notification(AComponent, Operation);
- if (Operation = opRemove) and (FDataLink <> nil) and
- (AComponent = DataSource) then DataSource := nil;
- end;
-
- procedure TDBEdit.KeyDown(var Key: Word; Shift: TShiftState);
- begin
- inherited KeyDown(Key, Shift);
- if (Key = VK_DELETE) or ((Key = VK_INSERT) and (ssShift in Shift)) then
- FDataLink.Edit;
- end;
-
- procedure TDBEdit.KeyPress(var Key: Char);
- begin
- inherited KeyPress(Key);
- if (Key in [#32..#255]) and (FDataLink.Field <> nil) and
- not FDataLink.Field.IsValidChar(Key) then
- begin
- MessageBeep(0);
- Key := #0;
- end;
- case Key of
- ^H, ^V, ^X, #32..#255:
- FDataLink.Edit;
- #27:
- begin
- FDataLink.Reset;
- SelectAll;
- Key := #0;
- end;
- end;
- end;
-
- function TDBEdit.EditCanModify: Boolean;
- begin
- Result := FDataLink.Edit;
- end;
-
- procedure TDBEdit.Reset;
- begin
- FDataLink.Reset;
- SelectAll;
- end;
-
- procedure TDBEdit.SetFocused(Value: Boolean);
- begin
- if FFocused <> Value then
- begin
- FFocused := Value;
- if (FAlignment <> taLeftJustify) and not IsMasked then Invalidate;
- FDataLink.Reset;
- end;
- end;
-
- procedure TDBEdit.Change;
- begin
- FDataLink.Modified;
- inherited Change;
- end;
-
- function TDBEdit.GetDataSource: TDataSource;
- begin
- Result := FDataLink.DataSource;
- end;
-
- procedure TDBEdit.SetDataSource(Value: TDataSource);
- begin
- FDataLink.DataSource := Value;
- if Value <> nil then Value.FreeNotification(Self);
- end;
-
- function TDBEdit.GetDataField: string;
- begin
- Result := FDataLink.FieldName;
- end;
-
- procedure TDBEdit.SetDataField(const Value: string);
- begin
- FDataLink.FieldName := Value;
- end;
-
- function TDBEdit.GetReadOnly: Boolean;
- begin
- Result := FDataLink.ReadOnly;
- end;
-
- procedure TDBEdit.SetReadOnly(Value: Boolean);
- begin
- FDataLink.ReadOnly := Value;
- end;
-
- function TDBEdit.GetField: TField;
- begin
- Result := FDataLink.Field;
- end;
-
- procedure TDBEdit.DataChange(Sender: TObject);
- begin
- if FDataLink.Field <> nil then
- begin
- if FAlignment <> FDataLink.Field.Alignment then
- begin
- EditText := ''; {forces update}
- FAlignment := FDataLink.Field.Alignment;
- end;
- EditMask := FDataLink.Field.EditMask;
- if FDataLink.Field.DataType = ftString then
- MaxLength := FDataLink.Field.Size else
- MaxLength := 0;
- if FFocused and FDataLink.CanModify then
- Text := FDataLink.Field.Text
- else
- EditText := FDataLink.Field.DisplayText;
- end else
- begin
- FAlignment := taLeftJustify;
- EditMask := '';
- MaxLength := 0;
- if csDesigning in ComponentState then
- EditText := Name else
- EditText := '';
- end;
- end;
-
- procedure TDBEdit.EditingChange(Sender: TObject);
- begin
- inherited ReadOnly := not FDataLink.Editing;
- end;
-
- procedure TDBEdit.UpdateData(Sender: TObject);
- begin
- ValidateEdit;
- FDataLink.Field.Text := Text;
- end;
-
- procedure TDBEdit.WMPaste(var Message: TMessage);
- begin
- FDataLink.Edit;
- inherited;
- end;
-
- procedure TDBEdit.WMCut(var Message: TMessage);
- begin
- FDataLink.Edit;
- inherited;
- end;
-
- procedure TDBEdit.CMEnter(var Message: TCMEnter);
- begin
- SetFocused(True);
- inherited;
- end;
-
- procedure TDBEdit.CMExit(var Message: TCMExit);
- begin
- try
- FDataLink.UpdateRecord;
- except
- SelectAll;
- SetFocus;
- raise;
- end;
- SetFocused(False);
- CheckCursor;
- DoExit;
- end;
-
- procedure TDBEdit.WMPaint(var Message: TWMPaint);
- var
- Left: Integer;
- Margins: TPoint;
- R: TRect;
- DC: HDC;
- PS: TPaintStruct;
- S: string;
- begin
- if ((FAlignment = taLeftJustify) or FFocused) and
- not (csPaintCopy in ControlState) then
- begin
- inherited;
- Exit;
- end;
- { Since edit controls do not handle justification unless multi-line (and
- then only poorly) we will draw right and center justify manually unless
- the edit has the focus. }
- if FCanvas = nil then
- begin
- FCanvas := TControlCanvas.Create;
- FCanvas.Control := Self;
- end;
- DC := Message.DC;
- if DC = 0 then DC := BeginPaint(Handle, PS);
- FCanvas.Handle := DC;
- try
- FCanvas.Font := Font;
- with FCanvas do
- begin
- R := ClientRect;
- if not (NewStyleControls and Ctl3D) and (BorderStyle = bsSingle) then
- begin
- Brush.Color := clWindowFrame;
- FrameRect(R);
- InflateRect(R, -1, -1);
- end;
- Brush.Color := Color;
- if (csPaintCopy in ControlState) and (FDataLink.Field <> nil) then
- begin
- S := FDataLink.Field.DisplayText;
- case CharCase of
- ecUpperCase: S := AnsiUpperCase(S);
- ecLowerCase: S := AnsiLowerCase(S);
- end;
- end else
- S := EditText;
- if PasswordChar <> #0 then FillChar(S[1], Length(S), PasswordChar);
- Margins := GetTextMargins;
- case FAlignment of
- taLeftJustify: Left := Margins.X;
- taRightJustify: Left := ClientWidth - TextWidth(S) - Margins.X - 1;
- else
- Left := (ClientWidth - TextWidth(S)) div 2;
- end;
- TextRect(R, Left, Margins.Y, S);
- end;
- finally
- FCanvas.Handle := 0;
- if Message.DC = 0 then EndPaint(Handle, PS);
- end;
- end;
-
- procedure TDBEdit.CMGetDataLink(var Message: TMessage);
- begin
- Message.Result := Integer(FDataLink);
- end;
-
- function TDBEdit.GetTextMargins: TPoint;
- var
- DC: HDC;
- SaveFont: HFont;
- I: Integer;
- SysMetrics, Metrics: TTextMetric;
- begin
- if NewStyleControls then
- begin
- if BorderStyle = bsNone then I := 0 else
- if Ctl3D then I := 1 else I := 2;
- Result.X := SendMessage(Handle, EM_GETMARGINS, 0, 0) and $0000FFFF + I;
- Result.Y := I;
- end else
- begin
- if BorderStyle = bsNone then I := 0 else
- begin
- DC := GetDC(0);
- GetTextMetrics(DC, SysMetrics);
- SaveFont := SelectObject(DC, Font.Handle);
- GetTextMetrics(DC, Metrics);
- SelectObject(DC, SaveFont);
- ReleaseDC(0, DC);
- I := SysMetrics.tmHeight;
- if I > Metrics.tmHeight then I := Metrics.tmHeight;
- I := I div 4;
- end;
- Result.X := I;
- Result.Y := I;
- end;
- end;
-
- { TDBText }
-
- constructor TDBText.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- ControlStyle := ControlStyle + [csReplicatable];
- AutoSize := False;
- ShowAccelChar := False;
- FDataLink := TFieldDataLink.Create;
- FDataLink.OnDataChange := DataChange;
- end;
-
- destructor TDBText.Destroy;
- begin
- FDataLink.Free;
- FDataLink := nil;
- inherited Destroy;
- end;
-
- procedure TDBText.Notification(AComponent: TComponent;
- Operation: TOperation);
- begin
- inherited Notification(AComponent, Operation);
- if (Operation = opRemove) and (FDataLink <> nil) and
- (AComponent = DataSource) then DataSource := nil;
- end;
-
- procedure TDBText.SetAutoSize(Value: Boolean);
- begin
- if AutoSize <> Value then
- begin
- if Value and FDataLink.DataSourceFixed then DBError(SDataSourceFixed);
- inherited SetAutoSize(Value);
- end;
- end;
-
- function TDBText.GetDataSource: TDataSource;
- begin
- Result := FDataLink.DataSource;
- end;
-
- procedure TDBText.SetDataSource(Value: TDataSource);
- begin
- FDataLink.DataSource := Value;
- if Value <> nil then Value.FreeNotification(Self);
- end;
-
- function TDBText.GetDataField: string;
- begin
- Result := FDataLink.FieldName;
- end;
-
- procedure TDBText.SetDataField(const Value: string);
- begin
- FDataLink.FieldName := Value;
- end;
-
- function TDBText.GetField: TField;
- begin
- Result := FDataLink.Field;
- end;
-
- function TDBText.GetFieldText: string;
- begin
- if FDataLink.Field <> nil then
- Result := FDataLink.Field.DisplayText
- else
- if csDesigning in ComponentState then Result := Name else Result := '';
- end;
-
- procedure TDBText.DataChange(Sender: TObject);
- begin
- Caption := GetFieldText;
- end;
-
- function TDBText.GetLabelText: string;
- begin
- if csPaintCopy in ControlState then
- Result := GetFieldText else
- Result := Caption;
- end;
-
- procedure TDBText.CMGetDataLink(var Message: TMessage);
- begin
- Message.Result := Integer(FDataLink);
- end;
-
- { TDBCheckBox }
-
- constructor TDBCheckBox.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- ControlStyle := ControlStyle + [csReplicatable];
- State := cbUnchecked;
- FDataLink := TFieldDataLink.Create;
- FValueCheck := LoadStr(STextTrue);
- FValueUncheck := LoadStr(STextFalse);
- FDataLink.Control := Self;
- FDataLink.OnDataChange := DataChange;
- FDataLink.OnUpdateData := UpdateData;
- FPaintControl := TPaintControl.Create(Self, 'BUTTON');
- FPaintControl.Ctl3DButton := True;
- end;
-
- destructor TDBCheckBox.Destroy;
- begin
- FPaintControl.Free;
- FDataLink.Free;
- FDataLink := nil;
- inherited Destroy;
- end;
-
- procedure TDBCheckBox.Notification(AComponent: TComponent;
- Operation: TOperation);
- begin
- inherited Notification(AComponent, Operation);
- if (Operation = opRemove) and (FDataLink <> nil) and
- (AComponent = DataSource) then DataSource := nil;
- end;
-
- function TDBCheckBox.GetFieldState: TCheckBoxState;
- var
- Text: string;
- begin
- if FDatalink.Field <> nil then
- if FDataLink.Field.IsNull then
- Result := cbGrayed
- else if FDataLink.Field.DataType = ftBoolean then
- if FDataLink.Field.AsBoolean then
- Result := cbChecked
- else
- Result := cbUnchecked
- else
- begin
- Result := cbGrayed;
- Text := FDataLink.Field.Text;
- if ValueMatch(FValueCheck, Text) then Result := cbChecked else
- if ValueMatch(FValueUncheck, Text) then Result := cbUnchecked;
- end
- else
- Result := cbUnchecked;
- end;
-
- procedure TDBCheckBox.DataChange(Sender: TObject);
- begin
- State := GetFieldState;
- end;
-
- procedure TDBCheckBox.UpdateData(Sender: TObject);
- var
- Pos: Integer;
- S: string;
- begin
- if State = cbGrayed then
- FDataLink.Field.Clear
- else
- if FDataLink.Field.DataType = ftBoolean then
- FDataLink.Field.AsBoolean := Checked
- else
- begin
- if Checked then S := FValueCheck else S := FValueUncheck;
- Pos := 1;
- FDataLink.Field.Text := ExtractFieldName(S, Pos);
- end;
- end;
-
- function TDBCheckBox.ValueMatch(const ValueList, Value: string): Boolean;
- var
- Pos: Integer;
- begin
- Result := False;
- Pos := 1;
- while Pos <= Length(ValueList) do
- if AnsiCompareText(ExtractFieldName(ValueList, Pos), Value) = 0 then
- begin
- Result := True;
- Break;
- end;
- end;
-
- procedure TDBCheckBox.Toggle;
- begin
- if FDataLink.Edit then
- begin
- inherited Toggle;
- FDataLink.Modified;
- end;
- end;
-
- function TDBCheckBox.GetDataSource: TDataSource;
- begin
- Result := FDataLink.DataSource;
- end;
-
- procedure TDBCheckBox.SetDataSource(Value: TDataSource);
- begin
- FDataLink.DataSource := Value;
- if Value <> nil then Value.FreeNotification(Self);
- end;
-
- function TDBCheckBox.GetDataField: string;
- begin
- Result := FDataLink.FieldName;
- end;
-
- procedure TDBCheckBox.SetDataField(const Value: string);
- begin
- FDataLink.FieldName := Value;
- end;
-
- function TDBCheckBox.GetReadOnly: Boolean;
- begin
- Result := FDataLink.ReadOnly;
- end;
-
- procedure TDBCheckBox.SetReadOnly(Value: Boolean);
- begin
- FDataLink.ReadOnly := Value;
- end;
-
- function TDBCheckBox.GetField: TField;
- begin
- Result := FDataLink.Field;
- end;
-
- procedure TDBCheckBox.KeyPress(var Key: Char);
- begin
- inherited KeyPress(Key);
- case Key of
- #8, ' ':
- FDataLink.Edit;
- #27:
- FDataLink.Reset;
- end;
- end;
-
- procedure TDBCheckBox.SetValueCheck(const Value: string);
- begin
- FValueCheck := Value;
- DataChange(Self);
- end;
-
- procedure TDBCheckBox.SetValueUncheck(const Value: string);
- begin
- FValueUncheck := Value;
- DataChange(Self);
- end;
-
- procedure TDBCheckBox.WndProc(var Message: TMessage);
- begin
- with Message do
- if (Msg = WM_CREATE) or (Msg = WM_WINDOWPOSCHANGED) or
- (Msg = CM_TEXTCHANGED) or (Msg = CM_FONTCHANGED) then
- FPaintControl.DestroyHandle;
- inherited;
- end;
-
- procedure TDBCheckBox.WMPaint(var Message: TWMPaint);
- begin
- if not (csPaintCopy in ControlState) then inherited else
- begin
- SendMessage(FPaintControl.Handle, BM_SETCHECK, Ord(GetFieldState), 0);
- SendMessage(FPaintControl.Handle, WM_PAINT, Message.DC, 0);
- end;
- end;
-
- procedure TDBCheckBox.CMExit(var Message: TCMExit);
- begin
- try
- FDataLink.UpdateRecord;
- except
- SetFocus;
- raise;
- end;
- inherited;
- end;
-
- procedure TDBCheckBox.CMGetDataLink(var Message: TMessage);
- begin
- Message.Result := Integer(FDataLink);
- end;
-
- { TDBComboBox }
-
- constructor TDBComboBox.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- ControlStyle := ControlStyle + [csReplicatable];
- FDataLink := TFieldDataLink.Create;
- FDataLink.Control := Self;
- FDataLink.OnDataChange := DataChange;
- FDataLink.OnUpdateData := UpdateData;
- FDataLink.OnEditingChange := EditingChange;
- FPaintControl := TPaintControl.Create(Self, 'COMBOBOX');
- end;
-
- destructor TDBComboBox.Destroy;
- begin
- FPaintControl.Free;
- FDataLink.Free;
- FDataLink := nil;
- inherited Destroy;
- end;
-
- procedure TDBComboBox.Notification(AComponent: TComponent;
- Operation: TOperation);
- begin
- inherited Notification(AComponent, Operation);
- if (Operation = opRemove) and (FDataLink <> nil) and
- (AComponent = DataSource) then DataSource := nil;
- end;
-
- procedure TDBComboBox.CreateWnd;
- begin
- inherited CreateWnd;
- SetEditReadOnly;
- end;
-
- procedure TDBComboBox.DataChange(Sender: TObject);
- begin
- if FDataLink.Field <> nil then
- SetComboText(FDataLink.Field.Text)
- else
- if csDesigning in ComponentState then
- SetComboText(Name)
- else
- SetComboText('');
- end;
-
- procedure TDBComboBox.UpdateData(Sender: TObject);
- begin
- FDataLink.Field.Text := GetComboText;
- end;
-
- procedure TDBComboBox.SetComboText(const Value: string);
- var
- I: Integer;
- Redraw: Boolean;
- begin
- if Value <> GetComboText then
- begin
- if Style <> csDropDown then
- begin
- Redraw := (Style <> csSimple) and HandleAllocated;
- if Redraw then SendMessage(Handle, WM_SETREDRAW, 0, 0);
- try
- if Value = '' then I := -1 else I := Items.IndexOf(Value);
- ItemIndex := I;
- finally
- if Redraw then
- begin
- SendMessage(Handle, WM_SETREDRAW, 1, 0);
- Invalidate;
- end;
- end;
- if I >= 0 then Exit;
- end;
- if Style in [csDropDown, csSimple] then Text := Value;
- end;
- end;
-
- function TDBComboBox.GetComboText: string;
- var
- I: Integer;
- begin
- if Style in [csDropDown, csSimple] then Result := Text else
- begin
- I := ItemIndex;
- if I < 0 then Result := '' else Result := Items[I];
- end;
- end;
-
- procedure TDBComboBox.Change;
- begin
- FDataLink.Edit;
- inherited Change;
- FDataLink.Modified;
- end;
-
- procedure TDBComboBox.Click;
- begin
- FDataLink.Edit;
- inherited Click;
- FDataLink.Modified;
- end;
-
- procedure TDBComboBox.DropDown;
- begin
- FDataLink.Edit;
- inherited DropDown;
- end;
-
- function TDBComboBox.GetDataSource: TDataSource;
- begin
- Result := FDataLink.DataSource;
- end;
-
- procedure TDBComboBox.SetDataSource(Value: TDataSource);
- begin
- FDataLink.DataSource := Value;
- if Value <> nil then Value.FreeNotification(Self);
- end;
-
- function TDBComboBox.GetDataField: string;
- begin
- Result := FDataLink.FieldName;
- end;
-
- procedure TDBComboBox.SetDataField(const Value: string);
- begin
- FDataLink.FieldName := Value;
- end;
-
- function TDBComboBox.GetReadOnly: Boolean;
- begin
- Result := FDataLink.ReadOnly;
- end;
-
- procedure TDBComboBox.SetReadOnly(Value: Boolean);
- begin
- FDataLink.ReadOnly := Value;
- end;
-
- function TDBComboBox.GetField: TField;
- begin
- Result := FDataLink.Field;
- end;
-
- procedure TDBComboBox.KeyDown(var Key: Word; Shift: TShiftState);
- begin
- inherited KeyDown(Key, Shift);
- if Key in [VK_BACK, VK_DELETE, VK_UP, VK_DOWN, 32..255] then
- begin
- if not FDataLink.Edit and (Key in [VK_UP, VK_DOWN]) then
- Key := 0;
- end;
- end;
-
- procedure TDBComboBox.KeyPress(var Key: Char);
- begin
- inherited KeyPress(Key);
- if (Key in [#32..#255]) and (FDataLink.Field <> nil) and
- not FDataLink.Field.IsValidChar(Key) then
- begin
- MessageBeep(0);
- Key := #0;
- end;
- case Key of
- ^H, ^V, ^X, #32..#255:
- FDataLink.Edit;
- #27:
- begin
- FDataLink.Reset;
- SelectAll;
- Key := #0;
- end;
- end;
- end;
-
- procedure TDBComboBox.EditingChange(Sender: TObject);
- begin
- SetEditReadOnly;
- end;
-
- procedure TDBComboBox.SetEditReadOnly;
- begin
- if (Style in [csDropDown, csSimple]) and HandleAllocated then
- SendMessage(EditHandle, EM_SETREADONLY, Ord(not FDataLink.Editing), 0);
- end;
-
- procedure TDBComboBox.WndProc(var Message: TMessage);
- begin
- if not (csDesigning in ComponentState) then
- case Message.Msg of
- WM_COMMAND:
- if TWMCommand(Message).NotifyCode = CBN_SELCHANGE then
- if not FDataLink.Edit then
- begin
- if Style <> csSimple then
- PostMessage(Handle, CB_SHOWDROPDOWN, 0, 0);
- Exit;
- end;
- CB_SHOWDROPDOWN:
- if Message.WParam <> 0 then FDataLink.Edit else
- if not FDataLink.Editing then DataChange(Self); {Restore text}
- WM_CREATE,
- WM_WINDOWPOSCHANGED,
- CM_FONTCHANGED:
- FPaintControl.DestroyHandle;
- end;
- inherited WndProc(Message);
- end;
-
- procedure TDBComboBox.ComboWndProc(var Message: TMessage; ComboWnd: HWnd;
- ComboProc: Pointer);
- begin
- if not (csDesigning in ComponentState) then
- case Message.Msg of
- WM_LBUTTONDOWN:
- if (Style = csSimple) and (ComboWnd <> EditHandle) then
- if not FDataLink.Edit then Exit;
- end;
- inherited ComboWndProc(Message, ComboWnd, ComboProc);
- end;
-
- procedure TDBComboBox.CMExit(var Message: TCMExit);
- begin
- try
- FDataLink.UpdateRecord;
- except
- SelectAll;
- SetFocus;
- raise;
- end;
- inherited;
- end;
-
- procedure TDBComboBox.WMPaint(var Message: TWMPaint);
- var
- S: string;
- R: TRect;
- P: TPoint;
- Child: HWND;
- begin
- if csPaintCopy in ControlState then
- begin
- if FDataLink.Field <> nil then S := FDataLink.Field.Text else S := '';
- if Style = csDropDown then
- begin
- SendMessage(FPaintControl.Handle, WM_SETTEXT, 0, Longint(PChar(S)));
- SendMessage(FPaintControl.Handle, WM_PAINT, Message.DC, 0);
- Child := GetWindow(FPaintControl.Handle, GW_CHILD);
- if Child <> 0 then
- begin
- Windows.GetClientRect(Child, R);
- Windows.MapWindowPoints(Child, FPaintControl.Handle, R.TopLeft, 2);
- GetWindowOrgEx(Message.DC, P);
- SetWindowOrgEx(Message.DC, P.X - R.Left, P.Y - R.Top, nil);
- IntersectClipRect(Message.DC, 0, 0, R.Right - R.Left, R.Bottom - R.Top);
- SendMessage(Child, WM_PAINT, Message.DC, 0);
- end;
- end else
- begin
- SendMessage(FPaintControl.Handle, CB_RESETCONTENT, 0, 0);
- if Items.IndexOf(S) <> -1 then
- begin
- SendMessage(FPaintControl.Handle, CB_ADDSTRING, 0, Longint(PChar(S)));
- SendMessage(FPaintControl.Handle, CB_SETCURSEL, 0, 0);
- end;
- SendMessage(FPaintControl.Handle, WM_PAINT, Message.DC, 0);
- end;
- end else
- inherited;
- end;
-
- procedure TDBComboBox.SetItems(Value: TStrings);
- begin
- Items.Assign(Value);
- DataChange(Self);
- end;
-
- procedure TDBCombobox.SetStyle(Value: TComboboxStyle);
- begin
- if (Value = csSimple) and Assigned(FDatalink) and FDatalink.DatasourceFixed then
- DBError(SNotReplicatable);
- inherited SetStyle(Value);
- end;
-
- procedure TDBCombobox.CMGetDatalink(var Message: TMessage);
- begin
- Message.Result := Integer(FDataLink);
- end;
-
-
- { TDBListBox }
-
- constructor TDBListBox.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- FDataLink := TFieldDataLink.Create;
- FDataLink.Control := Self;
- FDataLink.OnDataChange := DataChange;
- FDataLink.OnUpdateData := UpdateData;
- end;
-
- destructor TDBListBox.Destroy;
- begin
- FDataLink.Free;
- FDataLink := nil;
- inherited Destroy;
- end;
-
- procedure TDBListBox.Notification(AComponent: TComponent;
- Operation: TOperation);
- begin
- inherited Notification(AComponent, Operation);
- if (Operation = opRemove) and (FDataLink <> nil) and
- (AComponent = DataSource) then DataSource := nil;
- end;
-
- procedure TDBListBox.DataChange(Sender: TObject);
- begin
- if FDataLink.Field <> nil then
- ItemIndex := Items.IndexOf(FDataLink.Field.Text) else
- ItemIndex := -1;
- end;
-
- procedure TDBListBox.UpdateData(Sender: TObject);
- begin
- if ItemIndex >= 0 then
- FDataLink.Field.Text := Items[ItemIndex] else
- FDataLink.Field.Text := '';
- end;
-
- procedure TDBListBox.Click;
- begin
- if FDataLink.Edit then
- begin
- inherited Click;
- FDataLink.Modified;
- end;
- end;
-
- function TDBListBox.GetDataSource: TDataSource;
- begin
- Result := FDataLink.DataSource;
- end;
-
- procedure TDBListBox.SetDataSource(Value: TDataSource);
- begin
- FDataLink.DataSource := Value;
- if Value <> nil then Value.FreeNotification(Self);
- end;
-
- function TDBListBox.GetDataField: string;
- begin
- Result := FDataLink.FieldName;
- end;
-
- procedure TDBListBox.SetDataField(const Value: string);
- begin
- FDataLink.FieldName := Value;
- end;
-
- function TDBListBox.GetReadOnly: Boolean;
- begin
- Result := FDataLink.ReadOnly;
- end;
-
- procedure TDBListBox.SetReadOnly(Value: Boolean);
- begin
- FDataLink.ReadOnly := Value;
- end;
-
- function TDBListBox.GetField: TField;
- begin
- Result := FDataLink.Field;
- end;
-
- procedure TDBListBox.KeyDown(var Key: Word; Shift: TShiftState);
- begin
- inherited KeyDown(Key, Shift);
- if Key in [VK_PRIOR, VK_NEXT, VK_END, VK_HOME, VK_LEFT, VK_UP,
- VK_RIGHT, VK_DOWN] then
- if not FDataLink.Edit then Key := 0;
- end;
-
- procedure TDBListBox.KeyPress(var Key: Char);
- begin
- inherited KeyPress(Key);
- case Key of
- #32..#255:
- if not FDataLink.Edit then Key := #0;
- #27:
- FDataLink.Reset;
- end;
- end;
-
- procedure TDBListBox.WMLButtonDown(var Message: TWMLButtonDown);
- begin
- if FDataLink.Edit then inherited
- else
- begin
- SetFocus;
- with Message do
- MouseDown(mbLeft, KeysToShiftState(Keys), XPos, YPos);
- end;
- end;
-
- procedure TDBListBox.CMExit(var Message: TCMExit);
- begin
- try
- FDataLink.UpdateRecord;
- except
- SetFocus;
- raise;
- end;
- inherited;
- end;
-
- procedure TDBListBox.SetItems(Value: TStrings);
- begin
- Items.Assign(Value);
- DataChange(Self);
- end;
-
- { TDBRadioGroup }
-
- constructor TDBRadioGroup.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- FDataLink := TFieldDataLink.Create;
- FDataLink.Control := Self;
- FDataLink.OnDataChange := DataChange;
- FDataLink.OnUpdateData := UpdateData;
- FValues := TStringList.Create;
- end;
-
- destructor TDBRadioGroup.Destroy;
- begin
- FDataLink.Free;
- FDataLink := nil;
- FValues.Free;
- inherited Destroy;
- end;
-
- procedure TDBRadioGroup.Notification(AComponent: TComponent;
- Operation: TOperation);
- begin
- inherited Notification(AComponent, Operation);
- if (Operation = opRemove) and (FDataLink <> nil) and
- (AComponent = DataSource) then DataSource := nil;
- end;
-
- procedure TDBRadioGroup.DataChange(Sender: TObject);
- begin
- if FDataLink.Field <> nil then
- Value := FDataLink.Field.Text else
- Value := '';
- end;
-
- procedure TDBRadioGroup.UpdateData(Sender: TObject);
- begin
- if FDataLink.Field <> nil then FDataLink.Field.Text := Value;
- end;
-
- function TDBRadioGroup.GetDataSource: TDataSource;
- begin
- Result := FDataLink.DataSource;
- end;
-
- procedure TDBRadioGroup.SetDataSource(Value: TDataSource);
- begin
- FDataLink.DataSource := Value;
- if Value <> nil then Value.FreeNotification(Self);
- end;
-
- function TDBRadioGroup.GetDataField: string;
- begin
- Result := FDataLink.FieldName;
- end;
-
- procedure TDBRadioGroup.SetDataField(const Value: string);
- begin
- FDataLink.FieldName := Value;
- end;
-
- function TDBRadioGroup.GetReadOnly: Boolean;
- begin
- Result := FDataLink.ReadOnly;
- end;
-
- procedure TDBRadioGroup.SetReadOnly(Value: Boolean);
- begin
- FDataLink.ReadOnly := Value;
- end;
-
- function TDBRadioGroup.GetField: TField;
- begin
- Result := FDataLink.Field;
- end;
-
- function TDBRadioGroup.GetButtonValue(Index: Integer): string;
- begin
- if (Index < FValues.Count) and (FValues[Index] <> '') then
- Result := FValues[Index]
- else if Index < Items.Count then
- Result := Items[Index]
- else
- Result := '';
- end;
-
- procedure TDBRadioGroup.SetValue(const Value: string);
- var
- I, Index: Integer;
- begin
- if FValue <> Value then
- begin
- FInSetValue := True;
- try
- Index := -1;
- for I := 0 to Items.Count - 1 do
- if Value = GetButtonValue(I) then
- begin
- Index := I;
- Break;
- end;
- ItemIndex := Index;
- finally
- FInSetValue := False;
- end;
- FValue := Value;
- Change;
- end;
- end;
-
- procedure TDBRadioGroup.CMExit(var Message: TCMExit);
- begin
- try
- FDataLink.UpdateRecord;
- except
- if ItemIndex >= 0 then
- TRadioButton(Controls[ItemIndex]).SetFocus else
- TRadioButton(Controls[0]).SetFocus;
- raise;
- end;
- inherited;
- end;
-
- procedure TDBRadioGroup.Click;
- begin
- if not FInSetValue then
- begin
- inherited Click;
- if ItemIndex >= 0 then Value := GetButtonValue(ItemIndex);
- if FDataLink.Editing then FDataLink.Modified;
- end;
- end;
-
- procedure TDBRadioGroup.SetItems(Value: TStrings);
- begin
- Items.Assign(Value);
- DataChange(Self);
- end;
-
- procedure TDBRadioGroup.SetValues(Value: TStrings);
- begin
- FValues.Assign(Value);
- DataChange(Self);
- end;
-
- procedure TDBRadioGroup.Change;
- begin
- if Assigned(FOnChange) then FOnChange(Self);
- end;
-
- procedure TDBRadioGroup.KeyPress(var Key: Char);
- begin
- inherited KeyPress(Key);
- case Key of
- #8, ' ': FDataLink.Edit;
- #27: FDataLink.Reset;
- end;
- end;
-
- function TDBRadioGroup.CanModify: Boolean;
- begin
- Result := FDataLink.Edit;
- end;
-
- { TDBMemo }
-
- constructor TDBMemo.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- inherited ReadOnly := True;
- FAutoDisplay := True;
- FDataLink := TFieldDataLink.Create;
- FDataLink.Control := Self;
- FDataLink.OnDataChange := DataChange;
- FDataLink.OnEditingChange := EditingChange;
- FDataLink.OnUpdateData := UpdateData;
- FPaintControl := TPaintControl.Create(Self, 'EDIT');
- end;
-
- destructor TDBMemo.Destroy;
- begin
- FPaintControl.Free;
- FDataLink.Free;
- FDataLink := nil;
- inherited Destroy;
- end;
-
- procedure TDBMemo.Notification(AComponent: TComponent;
- Operation: TOperation);
- begin
- inherited Notification(AComponent, Operation);
- if (Operation = opRemove) and (FDataLink <> nil) and
- (AComponent = DataSource) then DataSource := nil;
- end;
-
- procedure TDBMemo.KeyDown(var Key: Word; Shift: TShiftState);
- begin
- inherited KeyDown(Key, Shift);
- if FMemoLoaded then
- begin
- if (Key = VK_DELETE) or ((Key = VK_INSERT) and (ssShift in Shift)) then
- FDataLink.Edit;
- end else
- Key := 0;
- end;
-
- procedure TDBMemo.KeyPress(var Key: Char);
- begin
- inherited KeyPress(Key);
- if FMemoLoaded then
- begin
- if (Key in [#32..#255]) and (FDataLink.Field <> nil) and
- not FDataLink.Field.IsValidChar(Key) then
- begin
- MessageBeep(0);
- Key := #0;
- end;
- case Key of
- ^H, ^I, ^J, ^M, ^V, ^X, #32..#255:
- FDataLink.Edit;
- #27:
- FDataLink.Reset;
- end;
- end else
- begin
- if Key = #13 then LoadMemo;
- Key := #0;
- end;
- end;
-
- procedure TDBMemo.Change;
- begin
- if FMemoLoaded then FDataLink.Modified;
- FMemoLoaded := True;
- inherited Change;
- end;
-
- function TDBMemo.GetDataSource: TDataSource;
- begin
- Result := FDataLink.DataSource;
- end;
-
- procedure TDBMemo.SetDataSource(Value: TDataSource);
- begin
- FDataLink.DataSource := Value;
- if Value <> nil then Value.FreeNotification(Self);
- end;
-
- function TDBMemo.GetDataField: string;
- begin
- Result := FDataLink.FieldName;
- end;
-
- procedure TDBMemo.SetDataField(const Value: string);
- begin
- FDataLink.FieldName := Value;
- end;
-
- function TDBMemo.GetReadOnly: Boolean;
- begin
- Result := FDataLink.ReadOnly;
- end;
-
- procedure TDBMemo.SetReadOnly(Value: Boolean);
- begin
- FDataLink.ReadOnly := Value;
- end;
-
- function TDBMemo.GetField: TField;
- begin
- Result := FDataLink.Field;
- end;
-
- procedure TDBMemo.LoadMemo;
- begin
- if not FMemoLoaded and (FDataLink.Field is TBlobField) then
- begin
- try
- Lines.Text := FDataLink.Field.AsString;
- FMemoLoaded := True;
- except
- Lines.Text := LoadStr(SMemoTooLarge);
- end;
- EditingChange(Self);
- end;
- end;
-
- procedure TDBMemo.DataChange(Sender: TObject);
- begin
- if FDataLink.Field <> nil then
- if FDataLink.Field is TBlobField then
- begin
- if FAutoDisplay or (FDataLink.Editing and FMemoLoaded) then
- begin
- FMemoLoaded := False;
- LoadMemo;
- end else
- begin
- Text := '(' + FDataLink.Field.DisplayLabel + ')';
- FMemoLoaded := False;
- end;
- end else
- begin
- if FFocused and FDataLink.CanModify then
- Text := FDataLink.Field.Text
- else
- Text := FDataLink.Field.DisplayText;
- FMemoLoaded := True;
- end
- else
- begin
- if csDesigning in ComponentState then Text := Name else Text := '';
- FMemoLoaded := False;
- end;
- end;
-
- procedure TDBMemo.EditingChange(Sender: TObject);
- begin
- inherited ReadOnly := not (FDataLink.Editing and FMemoLoaded);
- end;
-
- procedure TDBMemo.UpdateData(Sender: TObject);
- begin
- FDataLink.Field.AsString := Text;
- end;
-
- procedure TDBMemo.SetFocused(Value: Boolean);
- begin
- if FFocused <> Value then
- begin
- FFocused := Value;
- if not (FDataLink.Field is TBlobField) then FDataLink.Reset;
- end;
- end;
-
- procedure TDBMemo.WndProc(var Message: TMessage);
- begin
- with Message do
- if (Msg = WM_CREATE) or (Msg = WM_WINDOWPOSCHANGED) or
- (Msg = CM_FONTCHANGED) then FPaintControl.DestroyHandle;
- inherited;
- end;
-
- procedure TDBMemo.CMEnter(var Message: TCMEnter);
- begin
- SetFocused(True);
- inherited;
- end;
-
- procedure TDBMemo.CMExit(var Message: TCMExit);
- begin
- try
- FDataLink.UpdateRecord;
- except
- SetFocus;
- raise;
- end;
- SetFocused(False);
- inherited;
- end;
-
- procedure TDBMemo.SetAutoDisplay(Value: Boolean);
- begin
- if FAutoDisplay <> Value then
- begin
- FAutoDisplay := Value;
- if Value then LoadMemo;
- end;
- end;
-
- procedure TDBMemo.WMLButtonDblClk(var Message: TWMLButtonDblClk);
- begin
- if not FMemoLoaded then LoadMemo else inherited;
- end;
-
- procedure TDBMemo.WMCut(var Message: TMessage);
- begin
- FDataLink.Edit;
- inherited;
- end;
-
- procedure TDBMemo.WMPaste(var Message: TMessage);
- begin
- FDataLink.Edit;
- inherited;
- end;
-
- procedure TDBMemo.CMGetDataLink(var Message: TMessage);
- begin
- Message.Result := Integer(FDataLink);
- end;
-
- procedure TDBMemo.WMPaint(var Message: TWMPaint);
- var
- S: string;
- begin
- if not (csPaintCopy in ControlState) then inherited else
- begin
- if FDataLink.Field <> nil then
- if FDataLink.Field is TBlobField then
- S := AdjustLineBreaks(FDataLink.Field.AsString) else
- S := FDataLink.Field.DisplayText;
- SendMessage(FPaintControl.Handle, WM_SETTEXT, 0, Integer(PChar(S)));
- SendMessage(FPaintControl.Handle, WM_PAINT, Message.DC, 0);
- end;
- end;
-
- { TDBImage }
-
- constructor TDBImage.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- ControlStyle := ControlStyle + [csFramed, csOpaque];
- Width := 105;
- Height := 105;
- TabStop := True;
- ParentColor := False;
- FPicture := TPicture.Create;
- FPicture.OnChange := PictureChanged;
- FBorderStyle := bsSingle;
- FAutoDisplay := True;
- FCenter := True;
- FDataLink := TFieldDataLink.Create;
- FDataLink.Control := Self;
- FDataLink.OnDataChange := DataChange;
- FDataLink.OnUpdateData := UpdateData;
- FQuickDraw := True;
- end;
-
- destructor TDBImage.Destroy;
- begin
- FPicture.Free;
- FDataLink.Free;
- FDataLink := nil;
- inherited Destroy;
- end;
-
- function TDBImage.GetDataSource: TDataSource;
- begin
- Result := FDataLink.DataSource;
- end;
-
- procedure TDBImage.SetDataSource(Value: TDataSource);
- begin
- FDataLink.DataSource := Value;
- if Value <> nil then Value.FreeNotification(Self);
- end;
-
- function TDBImage.GetDataField: string;
- begin
- Result := FDataLink.FieldName;
- end;
-
- procedure TDBImage.SetDataField(const Value: string);
- begin
- FDataLink.FieldName := Value;
- end;
-
- function TDBImage.GetReadOnly: Boolean;
- begin
- Result := FDataLink.ReadOnly;
- end;
-
- procedure TDBImage.SetReadOnly(Value: Boolean);
- begin
- FDataLink.ReadOnly := Value;
- end;
-
- function TDBImage.GetField: TField;
- begin
- Result := FDataLink.Field;
- end;
-
- function TDBImage.GetPalette: HPALETTE;
- begin
- Result := 0;
- if FPicture.Graphic is TBitmap then
- Result := TBitmap(FPicture.Graphic).Palette;
- end;
-
- procedure TDBImage.SetAutoDisplay(Value: Boolean);
- begin
- if FAutoDisplay <> Value then
- begin
- FAutoDisplay := Value;
- if Value then LoadPicture;
- end;
- end;
-
- procedure TDBImage.SetBorderStyle(Value: TBorderStyle);
- begin
- if FBorderStyle <> Value then
- begin
- FBorderStyle := Value;
- RecreateWnd;
- end;
- end;
-
- procedure TDBImage.SetCenter(Value: Boolean);
- begin
- if FCenter <> Value then
- begin
- FCenter := Value;
- Invalidate;
- end;
- end;
-
- procedure TDBImage.SetPicture(Value: TPicture);
- begin
- FPicture.Assign(Value);
- end;
-
- procedure TDBImage.SetStretch(Value: Boolean);
- begin
- if FStretch <> Value then
- begin
- FStretch := Value;
- Invalidate;
- end;
- end;
-
- procedure TDBImage.Paint;
- var
- W, H: Integer;
- R: TRect;
- S: string;
- DrawPict: TPicture;
- begin
- with Canvas do
- begin
- Brush.Style := bsSolid;
- Brush.Color := Color;
- if FPictureLoaded or (csPaintCopy in ControlState) then
- begin
- DrawPict := TPicture.Create;
- H := 0;
- try
- if (csPaintCopy in ControlState) and
- Assigned(FDataLink.Field) and (FDataLink.Field is TBlobField) then
- begin
- DrawPict.Assign(FDataLink.Field);
- if DrawPict.Graphic is TBitmap then
- DrawPict.Bitmap.IgnorePalette := QuickDraw; //!!
- end
- else
- begin
- DrawPict.Assign(Picture);
- if Focused and (DrawPict.Graphic is TBitmap) and
- (DrawPict.Bitmap.Palette <> 0) then
- begin { Control has focus, so realize the bitmap palette in foreground }
- H := SelectPalette(Handle, DrawPict.Bitmap.Palette, False);
- RealizePalette(Handle);
- end;
- end;
- if Stretch then
- if (DrawPict.Graphic = nil) or DrawPict.Graphic.Empty then
- FillRect(ClientRect)
- else
- StretchDraw(ClientRect, DrawPict.Graphic)
- else
- begin
- SetRect(R, 0, 0, DrawPict.Width, DrawPict.Height);
- if Center then OffsetRect(R, (ClientWidth - DrawPict.Width) div 2,
- (ClientHeight - DrawPict.Height) div 2);
- StretchDraw(R, DrawPict.Graphic);
- ExcludeClipRect(Handle, R.Left, R.Top, R.Right, R.Bottom);
- FillRect(ClientRect);
- SelectClipRgn(Handle, 0);
- end;
- finally
- if H <> 0 then SelectPalette(Handle, H, True);
- DrawPict.Free;
- end;
- end
- else begin
- Font := Self.Font;
- if FDataLink.Field <> nil then
- S := FDataLink.Field.DisplayLabel
- else S := Name;
- S := '(' + S + ')';
- W := TextWidth(S);
- H := TextHeight(S);
- R := ClientRect;
- TextRect(R, (R.Right - W) div 2, (R.Bottom - H) div 2, S);
- end;
- if (GetParentForm(Self).ActiveControl = Self) and
- not (csDesigning in ComponentState) and
- not (csPaintCopy in ControlState) then
- begin
- Brush.Color := clWindowFrame;
- FrameRect(ClientRect);
- end;
- end;
- end;
-
- procedure TDBImage.PictureChanged(Sender: TObject);
- begin
- FDataLink.Modified;
- FPictureLoaded := True;
- Invalidate;
- end;
-
- procedure TDBImage.Notification(AComponent: TComponent;
- Operation: TOperation);
- begin
- inherited Notification(AComponent, Operation);
- if (Operation = opRemove) and (FDataLink <> nil) and
- (AComponent = DataSource) then DataSource := nil;
- end;
-
- procedure TDBImage.LoadPicture;
- begin
- if not FPictureLoaded and (FDataLink.Field is TBlobField) then
- Picture.Assign(FDataLink.Field);
- end;
-
- procedure TDBImage.DataChange(Sender: TObject);
- begin
- Picture.Graphic := nil;
- FPictureLoaded := False;
- if FAutoDisplay then LoadPicture;
- end;
-
- procedure TDBImage.UpdateData(Sender: TObject);
- begin
- if FDataLink.Field is TBlobField then
- with TBlobField(FDataLink.Field) do
- if Picture.Graphic is TBitmap then
- Assign(Picture.Graphic)
- else
- Clear;
- end;
-
- procedure TDBImage.CopyToClipboard;
- begin
- if Picture.Graphic <> nil then Clipboard.Assign(Picture);
- end;
-
- procedure TDBImage.CutToClipboard;
- begin
- if Picture.Graphic <> nil then
- if FDataLink.Edit then
- begin
- CopyToClipboard;
- Picture.Graphic := nil;
- end;
- end;
-
- procedure TDBImage.PasteFromClipboard;
- begin
- if Clipboard.HasFormat(CF_BITMAP) and FDataLink.Edit then
- Picture.Bitmap.Assign(Clipboard);
- end;
-
- procedure TDBImage.CreateParams(var Params: TCreateParams);
- begin
- inherited CreateParams(Params);
- if FBorderStyle = bsSingle then
- Params.Style := Params.Style or WS_BORDER;
- end;
-
- procedure TDBImage.KeyDown(var Key: Word; Shift: TShiftState);
- begin
- inherited KeyDown(Key, Shift);
- case Key of
- VK_INSERT:
- if ssShift in Shift then PasteFromClipBoard else
- if ssCtrl in Shift then CopyToClipBoard;
- VK_DELETE:
- if ssShift in Shift then CutToClipBoard;
- end;
- end;
-
- procedure TDBImage.KeyPress(var Key: Char);
- begin
- inherited KeyPress(Key);
- case Key of
- ^X: CutToClipBoard;
- ^C: CopyToClipBoard;
- ^V: PasteFromClipBoard;
- #13: LoadPicture;
- #27: FDataLink.Reset;
- end;
- end;
-
- procedure TDBImage.CMEnter(var Message: TCMEnter);
- begin
- Invalidate; { Draw the focus marker }
- inherited;
- end;
-
- procedure TDBImage.CMExit(var Message: TCMExit);
- begin
- Invalidate; { Erase the focus marker }
- inherited;
- end;
-
- procedure TDBImage.CMTextChanged(var Message: TMessage);
- begin
- inherited;
- if not FPictureLoaded then Invalidate;
- end;
-
- procedure TDBImage.WMLButtonDown(var Message: TWMLButtonDown);
- begin
- if TabStop and CanFocus then SetFocus;
- inherited;
- end;
-
- procedure TDBImage.WMLButtonDblClk(var Message: TWMLButtonDblClk);
- begin
- LoadPicture;
- inherited;
- end;
-
- procedure TDBImage.WMCut(var Message: TMessage);
- begin
- CutToClipboard;
- end;
-
- procedure TDBImage.WMCopy(var Message: TMessage);
- begin
- CopyToClipboard;
- end;
-
- procedure TDBImage.WMPaste(var Message: TMessage);
- begin
- PasteFromClipboard;
- end;
-
- { TDBNavigator }
-
- const
- BtnStateName: array[TNavGlyph] of PChar = ('EN', 'DI');
- BtnTypeName: array[TNavigateBtn] of PChar = ('FIRST', 'PRIOR', 'NEXT',
- 'LAST', 'INSERT', 'DELETE', 'EDIT', 'POST', 'CANCEL', 'REFRESH');
- BtnHintId: array[TNavigateBtn] of Word = (SFirstRecord, SPriorRecord,
- SNextRecord, SLastRecord, SInsertRecord, SDeleteRecord, SEditRecord,
- SPostEdit, SCancelEdit, SRefreshRecord);
-
- constructor TDBNavigator.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- ControlStyle := ControlStyle - [csAcceptsControls, csSetCaption] + [csOpaque];
- if not NewStyleControls then ControlStyle := ControlStyle + [csFramed];
- FDataLink := TNavDataLink.Create(Self);
- FVisibleButtons := [nbFirst, nbPrior, nbNext, nbLast, nbInsert,
- nbDelete, nbEdit, nbPost, nbCancel, nbRefresh];
- FHints := TStringList.Create;
- InitButtons;
- BevelOuter := bvNone;
- BevelInner := bvNone;
- Width := 241;
- Height := 25;
- ButtonWidth := 0;
- FocusedButton := nbFirst;
- FConfirmDelete := True;
- end;
-
- destructor TDBNavigator.Destroy;
- begin
- FDataLink.Free;
- FHints.Free;
- FDataLink := nil;
- inherited Destroy;
- end;
-
- procedure TDBNavigator.InitButtons;
- var
- I: TNavigateBtn;
- Btn: TNavButton;
- X: Integer;
- ResName: string;
- begin
- MinBtnSize := Point(20, 18);
- X := 0;
- for I := Low(Buttons) to High(Buttons) do
- begin
- Btn := TNavButton.Create (Self);
- Btn.Index := I;
- Btn.Visible := I in FVisibleButtons;
- Btn.Enabled := True;
- Btn.SetBounds (X, 0, MinBtnSize.X, MinBtnSize.Y);
- FmtStr(ResName, 'dbn_%s', [BtnTypeName[I]]);
- Btn.Glyph.Handle := LoadBitmap(HInstance, PChar(ResName));
- Btn.NumGlyphs := 2;
- Btn.Enabled := False; {!!! Force creation of speedbutton images !!!}
- Btn.Enabled := True;
- Btn.OnClick := Click;
- Btn.OnMouseDown := BtnMouseDown;
- Btn.Parent := Self;
- Buttons[I] := Btn;
- X := X + MinBtnSize.X;
- end;
- InitHints;
- Buttons[nbPrior].NavStyle := Buttons[nbPrior].NavStyle + [nsAllowTimer];
- Buttons[nbNext].NavStyle := Buttons[nbNext].NavStyle + [nsAllowTimer];
- end;
-
- procedure TDBNavigator.InitHints;
- var
- I: Integer;
- J: TNavigateBtn;
- begin
- for J := Low(Buttons) to High(Buttons) do
- Buttons[J].Hint := LoadStr (BtnHintId[J]);
- J := Low(Buttons);
- for I := 0 to (FHints.Count - 1) do
- begin
- if FHints.Strings[I] <> '' then Buttons[J].Hint := FHints.Strings[I];
- if J = High(Buttons) then Exit;
- Inc(J);
- end;
- end;
-
- procedure TDBNavigator.SetHints(Value: TStrings);
- begin
- FHints.Assign(Value);
- InitHints;
- end;
-
- procedure TDBNavigator.GetChildren(Proc: TGetChildProc);
- begin
- end;
-
- procedure TDBNavigator.Notification(AComponent: TComponent;
- Operation: TOperation);
- begin
- inherited Notification(AComponent, Operation);
- if (Operation = opRemove) and (FDataLink <> nil) and
- (AComponent = DataSource) then DataSource := nil;
- end;
-
- procedure TDBNavigator.SetVisible(Value: TButtonSet);
- var
- I: TNavigateBtn;
- W, H: Integer;
- begin
- W := Width;
- H := Height;
- FVisibleButtons := Value;
- for I := Low(Buttons) to High(Buttons) do
- Buttons[I].Visible := I in FVisibleButtons;
- AdjustSize (W, H);
- if (W <> Width) or (H <> Height) then
- inherited SetBounds (Left, Top, W, H);
- Invalidate;
- end;
-
- procedure TDBNavigator.AdjustSize (var W: Integer; var H: Integer);
- var
- Count: Integer;
- MinW: Integer;
- I: TNavigateBtn;
- Space, Temp, Remain: Integer;
- X: Integer;
- begin
- if (csLoading in ComponentState) then Exit;
- if Buttons[nbFirst] = nil then Exit;
-
- Count := 0;
- for I := Low(Buttons) to High(Buttons) do
- begin
- if Buttons[I].Visible then
- begin
- Inc(Count);
- end;
- end;
- if Count = 0 then Inc(Count);
-
- MinW := Count * MinBtnSize.X;
- if W < MinW then W := MinW;
- if H < MinBtnSize.Y then H := MinBtnSize.Y;
-
- ButtonWidth := W div Count;
- Temp := Count * ButtonWidth;
- if Align = alNone then W := Temp;
-
- X := 0;
- Remain := W - Temp;
- Temp := Count div 2;
- for I := Low(Buttons) to High(Buttons) do
- begin
- if Buttons[I].Visible then
- begin
- Space := 0;
- if Remain <> 0 then
- begin
- Dec(Temp, Remain);
- if Temp < 0 then
- begin
- Inc(Temp, Count);
- Space := 1;
- end;
- end;
- Buttons[I].SetBounds(X, 0, ButtonWidth + Space, Height);
- Inc(X, ButtonWidth + Space);
- end
- else
- Buttons[I].SetBounds (Width + 1, 0, ButtonWidth, Height);
- end;
- end;
-
- procedure TDBNavigator.SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
- var
- W, H: Integer;
- begin
- W := AWidth;
- H := AHeight;
- AdjustSize (W, H);
- inherited SetBounds (ALeft, ATop, W, H);
- end;
-
- procedure TDBNavigator.WMSize(var Message: TWMSize);
- var
- W, H: Integer;
- begin
- inherited;
-
- { check for minimum size }
- W := Width;
- H := Height;
- AdjustSize (W, H);
- if (W <> Width) or (H <> Height) then
- inherited SetBounds(Left, Top, W, H);
- Message.Result := 0;
- end;
-
- procedure TDBNavigator.Click(Sender: TObject);
- begin
- BtnClick (TNavButton (Sender).Index);
- end;
-
- procedure TDBNavigator.BtnMouseDown(Sender: TObject; Button: TMouseButton;
- Shift: TShiftState; X, Y: Integer);
- var
- OldFocus: TNavigateBtn;
- begin
- OldFocus := FocusedButton;
- FocusedButton := TNavButton (Sender).Index;
- if TabStop and (GetFocus <> Handle) and CanFocus then
- begin
- SetFocus;
- if (GetFocus <> Handle) then
- Exit;
- end
- else if TabStop and (GetFocus = Handle) and (OldFocus <> FocusedButton) then
- begin
- Buttons[OldFocus].Invalidate;
- Buttons[FocusedButton].Invalidate;
- end;
- end;
-
- procedure TDBNavigator.BtnClick(Index: TNavigateBtn);
- begin
- if (DataSource <> nil) and (DataSource.State <> dsInactive) then
- begin
- with DataSource.DataSet do
- begin
- case Index of
- nbPrior: Prior;
- nbNext: Next;
- nbFirst: First;
- nbLast: Last;
- nbInsert: Insert;
- nbEdit: Edit;
- nbCancel: Cancel;
- nbPost: Post;
- nbRefresh: Refresh;
- nbDelete:
- if not FConfirmDelete or
- (MessageDlg(LoadStr(SDeleteRecordQuestion), mtConfirmation,
- mbOKCancel, 0) <> idCancel) then Delete;
- end;
- end;
- end;
- if not (csDesigning in ComponentState) and Assigned(FOnNavClick) then
- FOnNavClick(Self, Index);
- end;
-
- procedure TDBNavigator.WMSetFocus(var Message: TWMSetFocus);
- begin
- Buttons[FocusedButton].Invalidate;
- end;
-
- procedure TDBNavigator.WMKillFocus(var Message: TWMKillFocus);
- begin
- Buttons[FocusedButton].Invalidate;
- end;
-
- procedure TDBNavigator.KeyDown(var Key: Word; Shift: TShiftState);
- var
- NewFocus: TNavigateBtn;
- OldFocus: TNavigateBtn;
- begin
- OldFocus := FocusedButton;
- case Key of
- VK_RIGHT:
- begin
- NewFocus := FocusedButton;
- repeat
- if NewFocus < High(Buttons) then
- NewFocus := Succ(NewFocus);
- until (NewFocus = High(Buttons)) or (Buttons[NewFocus].Visible);
- if NewFocus <> FocusedButton then
- begin
- FocusedButton := NewFocus;
- Buttons[OldFocus].Invalidate;
- Buttons[FocusedButton].Invalidate;
- end;
- end;
- VK_LEFT:
- begin
- NewFocus := FocusedButton;
- repeat
- if NewFocus > Low(Buttons) then
- NewFocus := Pred(NewFocus);
- until (NewFocus = Low(Buttons)) or (Buttons[NewFocus].Visible);
- if NewFocus <> FocusedButton then
- begin
- FocusedButton := NewFocus;
- Buttons[OldFocus].Invalidate;
- Buttons[FocusedButton].Invalidate;
- end;
- end;
- VK_SPACE:
- begin
- if Buttons[FocusedButton].Enabled then
- Buttons[FocusedButton].Click;
- end;
- end;
- end;
-
- procedure TDBNavigator.WMGetDlgCode(var Message: TWMGetDlgCode);
- begin
- Message.Result := DLGC_WANTARROWS;
- end;
-
- procedure TDBNavigator.DataChanged;
- var
- UpEnable, DnEnable: Boolean;
- begin
- UpEnable := Enabled and FDataLink.Active and not FDataLink.DataSet.BOF;
- DnEnable := Enabled and FDataLink.Active and not FDataLink.DataSet.EOF;
- Buttons[nbFirst].Enabled := UpEnable;
- Buttons[nbPrior].Enabled := UpEnable;
- Buttons[nbNext].Enabled := DnEnable;
- Buttons[nbLast].Enabled := DnEnable;
- Buttons[nbDelete].Enabled := Enabled and FDataLink.Active and
- FDataLink.DataSet.CanModify and
- not (FDataLink.DataSet.BOF and FDataLink.DataSet.EOF);
- end;
-
- procedure TDBNavigator.EditingChanged;
- var
- CanModify: Boolean;
- begin
- CanModify := Enabled and FDataLink.Active and FDataLink.DataSet.CanModify;
- Buttons[nbInsert].Enabled := CanModify;
- Buttons[nbEdit].Enabled := CanModify and not FDataLink.Editing;
- Buttons[nbPost].Enabled := CanModify and FDataLink.Editing;
- Buttons[nbCancel].Enabled := CanModify and FDataLink.Editing;
- Buttons[nbRefresh].Enabled := not (FDataLink.DataSet is TQuery);
- end;
-
- procedure TDBNavigator.ActiveChanged;
- var
- I: TNavigateBtn;
- begin
- if not (Enabled and FDataLink.Active) then
- for I := Low(Buttons) to High(Buttons) do
- Buttons[I].Enabled := False
- else
- begin
- DataChanged;
- EditingChanged;
- end;
- end;
-
- procedure TDBNavigator.CMEnabledChanged(var Message: TMessage);
- begin
- inherited;
- if not (csLoading in ComponentState) then
- ActiveChanged;
- end;
-
- procedure TDBNavigator.SetDataSource(Value: TDataSource);
- begin
- FDataLink.DataSource := Value;
- if not (csLoading in ComponentState) then
- ActiveChanged;
- if Value <> nil then Value.FreeNotification(Self);
- end;
-
- function TDBNavigator.GetDataSource: TDataSource;
- begin
- Result := FDataLink.DataSource;
- end;
-
- procedure TDBNavigator.Loaded;
- var
- W, H: Integer;
- begin
- inherited Loaded;
- W := Width;
- H := Height;
- AdjustSize (W, H);
- if (W <> Width) or (H <> Height) then
- inherited SetBounds (Left, Top, W, H);
- InitHints;
- ActiveChanged;
- end;
-
- {TNavButton}
-
- destructor TNavButton.Destroy;
- begin
- if FRepeatTimer <> nil then
- FRepeatTimer.Free;
- inherited Destroy;
- end;
-
- procedure TNavButton.MouseDown(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer);
- begin
- inherited MouseDown (Button, Shift, X, Y);
- if nsAllowTimer in FNavStyle then
- begin
- if FRepeatTimer = nil then
- FRepeatTimer := TTimer.Create(Self);
-
- FRepeatTimer.OnTimer := TimerExpired;
- FRepeatTimer.Interval := InitRepeatPause;
- FRepeatTimer.Enabled := True;
- end;
- end;
-
- procedure TNavButton.MouseUp(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer);
- begin
- inherited MouseUp (Button, Shift, X, Y);
- if FRepeatTimer <> nil then
- FRepeatTimer.Enabled := False;
- end;
-
- procedure TNavButton.TimerExpired(Sender: TObject);
- begin
- FRepeatTimer.Interval := RepeatPause;
- if (FState = bsDown) and MouseCapture then
- begin
- try
- Click;
- except
- FRepeatTimer.Enabled := False;
- raise;
- end;
- end;
- end;
-
- procedure TNavButton.Paint;
- var
- R: TRect;
- begin
- inherited Paint;
- if (GetFocus = Parent.Handle) and
- (FIndex = TDBNavigator (Parent).FocusedButton) then
- begin
- R := Bounds(0, 0, Width, Height);
- InflateRect(R, -3, -3);
- if FState = bsDown then
- OffsetRect(R, 1, 1);
- DrawFocusRect(Canvas.Handle, R);
- end;
- end;
-
- { TNavDataLink }
-
- constructor TNavDataLink.Create(ANav: TDBNavigator);
- begin
- inherited Create;
- FNavigator := ANav;
- end;
-
- destructor TNavDataLink.Destroy;
- begin
- FNavigator := nil;
- inherited Destroy;
- end;
-
- procedure TNavDataLink.EditingChanged;
- begin
- if FNavigator <> nil then FNavigator.EditingChanged;
- end;
-
- procedure TNavDataLink.DataSetChanged;
- begin
- if FNavigator <> nil then FNavigator.DataChanged;
- end;
-
- procedure TNavDataLink.ActiveChanged;
- begin
- if FNavigator <> nil then FNavigator.ActiveChanged;
- end;
-
- { TDataSourceLink }
-
- procedure TDataSourceLink.ActiveChanged;
- begin
- if FDBLookupControl <> nil then FDBLookupControl.DataLinkActiveChanged;
- end;
-
- procedure TDataSourceLink.RecordChanged(Field: TField);
- begin
- if FDBLookupControl <> nil then FDBLookupControl.DataLinkRecordChanged(Field);
- end;
-
- { TListSourceLink }
-
- procedure TListSourceLink.ActiveChanged;
- begin
- if FDBLookupControl <> nil then FDBLookupControl.ListLinkActiveChanged;
- end;
-
- procedure TListSourceLink.DataSetChanged;
- begin
- if FDBLookupControl <> nil then FDBLookupControl.ListLinkDataChanged;
- end;
-
- { TDBLookupControl }
-
- function VarEquals(const V1, V2: Variant): Boolean;
- begin
- Result := False;
- try
- Result := V1 = V2;
- except
- end;
- end;
-
- var
- SearchTickCount: Integer = 0;
-
- constructor TDBLookupControl.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- if NewStyleControls then
- ControlStyle := [csOpaque] else
- ControlStyle := [csOpaque, csFramed];
- ParentColor := False;
- TabStop := True;
- FLookupSource := TDataSource.Create(Self);
- FDataLink := TDataSourceLink.Create;
- FDataLink.FDBLookupControl := Self;
- FListLink := TListSourceLink.Create;
- FListLink.FDBLookupControl := Self;
- FListFields := TList.Create;
- FKeyValue := Null;
- end;
-
- destructor TDBLookupControl.Destroy;
- begin
- FListFields.Free;
- FListLink.FDBLookupControl := nil;
- FListLink.Free;
- FDataLink.FDBLookupControl := nil;
- FDataLink.Free;
- inherited Destroy;
- end;
-
- function TDBLookupControl.CanModify: Boolean;
- begin
- Result := FListActive and not ReadOnly and ((FDataLink.DataSource = nil) or
- (FMasterField <> nil) and FMasterField.CanModify);
- end;
-
- procedure TDBLookupControl.CheckNotCircular;
- begin
- if FDataLink.Active and FDataLink.DataSet.IsLinkedTo(ListSource) then
- DBError(SCircularDataLink);
- end;
-
- procedure TDBLookupControl.CheckNotLookup;
- begin
- if FLookupMode then DBError(SPropDefByLookup);
- if FDataLink.DataSourceFixed then DBError(SDataSourceFixed);
- end;
-
- procedure TDBLookupControl.DataLinkActiveChanged;
- begin
- FDataField := nil;
- FMasterField := nil;
- if FDataLink.Active and (FDataFieldName <> '') then
- begin
- CheckNotCircular;
- FDataField := FDataLink.DataSet.FieldByName(FDataFieldName);
- FMasterField := FDataField;
- end;
- SetLookupMode((FDataField <> nil) and FDataField.Lookup);
- DataLinkRecordChanged(nil);
- end;
-
- procedure TDBLookupControl.DataLinkRecordChanged(Field: TField);
- begin
- if (Field = nil) or (Field = FMasterField) then
- if FMasterField <> nil then
- SetKeyValue(FMasterField.Value) else
- SetKeyValue(Null);
- end;
-
- function TDBLookupControl.GetBorderSize: Integer;
- var
- Params: TCreateParams;
- R: TRect;
- begin
- CreateParams(Params);
- SetRect(R, 0, 0, 0, 0);
- AdjustWindowRectEx(R, Params.Style, False, Params.ExStyle);
- Result := R.Bottom - R.Top;
- end;
-
- function TDBLookupControl.GetDataSource: TDataSource;
- begin
- Result := FDataLink.DataSource;
- end;
-
- function TDBLookupControl.GetKeyFieldName: string;
- begin
- if FLookupMode then Result := '' else Result := FKeyFieldName;
- end;
-
- function TDBLookupControl.GetListSource: TDataSource;
- begin
- if FLookupMode then Result := nil else Result := FListLink.DataSource;
- end;
-
- function TDBLookupControl.GetReadOnly: Boolean;
- begin
- Result := FDataLink.ReadOnly;
- end;
-
- function TDBLookupControl.GetTextHeight: Integer;
- var
- DC: HDC;
- SaveFont: HFont;
- Metrics: TTextMetric;
- begin
- DC := GetDC(0);
- SaveFont := SelectObject(DC, Font.Handle);
- GetTextMetrics(DC, Metrics);
- SelectObject(DC, SaveFont);
- ReleaseDC(0, DC);
- Result := Metrics.tmHeight;
- end;
-
- procedure TDBLookupControl.KeyValueChanged;
- begin
- end;
-
- procedure TDBLookupControl.ListLinkActiveChanged;
- var
- DataSet: TDataSet;
- ResultField: TField;
- begin
- FListActive := False;
- FKeyField := nil;
- FListField := nil;
- FListFields.Clear;
- if FListLink.Active and (FKeyFieldName <> '') then
- begin
- CheckNotCircular;
- DataSet := FListLink.DataSet;
- FKeyField := DataSet.FieldByName(FKeyFieldName);
- DataSet.GetFieldList(FListFields, FListFieldName);
- if FLookupMode then
- begin
- ResultField := DataSet.FieldByName(FDataField.LookupResultField);
- if FListFields.IndexOf(ResultField) < 0 then
- FListFields.Insert(0, ResultField);
- FListField := ResultField;
- end else
- begin
- if FListFields.Count = 0 then FListFields.Add(FKeyField);
- if (FListFieldIndex >= 0) and (FListFieldIndex < FListFields.Count) then
- FListField := FListFields[FListFieldIndex] else
- FListField := FListFields[0];
- end;
- FListActive := True;
- end;
- end;
-
- procedure TDBLookupControl.ListLinkDataChanged;
- begin
- end;
-
- function TDBLookupControl.LocateKey: Boolean;
- begin
- Result := False;
- try
- if not VarIsNull(FKeyValue) and
- FListLink.DataSet.Locate(FKeyFieldName, FKeyValue, []) then
- Result := True;
- except
- end;
- end;
-
- procedure TDBLookupControl.Notification(AComponent: TComponent;
- Operation: TOperation);
- begin
- inherited Notification(AComponent, Operation);
- if Operation = opRemove then
- begin
- if (FDataLink <> nil) and (AComponent = DataSource) then DataSource := nil;
- if (FListLink <> nil) and (AComponent = ListSource) then ListSource := nil;
- end;
- end;
-
- procedure TDBLookupControl.ProcessSearchKey(Key: Char);
- var
- TickCount: Integer;
- S: string;
- begin
- if (FListField <> nil) and (FListField.FieldKind = fkData) and
- (FListField.DataType = ftString) then
- case Key of
- #8, #27: FSearchText := '';
- #32..#255:
- if CanModify then
- begin
- TickCount := GetTickCount;
- if TickCount - SearchTickCount > 2000 then FSearchText := '';
- SearchTickCount := TickCount;
- if Length(FSearchText) < 32 then
- begin
- S := FSearchText + Key;
- if FListLink.DataSet.Locate(FListField.FieldName, S,
- [loCaseInsensitive, loPartialKey]) then
- begin
- SelectKeyValue(FKeyField.Value);
- FSearchText := S;
- end;
- end;
- end;
- end;
- end;
-
- procedure TDBLookupControl.SelectKeyValue(const Value: Variant);
- begin
- if FMasterField <> nil then
- begin
- if FDataLink.Edit then
- FMasterField.Value := Value;
- end else
- SetKeyValue(Value);
- Repaint;
- Click;
- end;
-
- procedure TDBLookupControl.SetDataFieldName(const Value: string);
- begin
- if FDataFieldName <> Value then
- begin
- FDataFieldName := Value;
- DataLinkActiveChanged;
- end;
- end;
-
- procedure TDBLookupControl.SetDataSource(Value: TDataSource);
- begin
- FDataLink.DataSource := Value;
- if Value <> nil then Value.FreeNotification(Self);
- end;
-
- procedure TDBLookupControl.SetKeyFieldName(const Value: string);
- begin
- CheckNotLookup;
- if FKeyFieldName <> Value then
- begin
- FKeyFieldName := Value;
- ListLinkActiveChanged;
- end;
- end;
-
- procedure TDBLookupControl.SetKeyValue(const Value: Variant);
- begin
- if not VarEquals(FKeyValue, Value) then
- begin
- FKeyValue := Value;
- KeyValueChanged;
- end;
- end;
-
- procedure TDBLookupControl.SetListFieldName(const Value: string);
- begin
- if FListFieldName <> Value then
- begin
- FListFieldName := Value;
- ListLinkActiveChanged;
- end;
- end;
-
- procedure TDBLookupControl.SetListSource(Value: TDataSource);
- begin
- CheckNotLookup;
- FListLink.DataSource := Value;
- if Value <> nil then Value.FreeNotification(Self);
- end;
-
- procedure TDBLookupControl.SetLookupMode(Value: Boolean);
- begin
- if FLookupMode <> Value then
- if Value then
- begin
- FMasterField := FDataField.DataSet.FieldByName(FDataField.KeyFields);
- FLookupSource.DataSet := FDataField.LookupDataSet;
- FKeyFieldName := FDataField.LookupKeyFields;
- FLookupMode := True;
- FListLink.DataSource := FLookupSource;
- end else
- begin
- FListLink.DataSource := nil;
- FLookupMode := False;
- FKeyFieldName := '';
- FLookupSource.DataSet := nil;
- FMasterField := FDataField;
- end;
- end;
-
- procedure TDBLookupControl.SetReadOnly(Value: Boolean);
- begin
- FDataLink.ReadOnly := Value;
- end;
-
- procedure TDBLookupControl.WMGetDlgCode(var Message: TMessage);
- begin
- Message.Result := DLGC_WANTARROWS or DLGC_WANTCHARS;
- end;
-
- procedure TDBLookupControl.WMKillFocus(var Message: TMessage);
- begin
- FFocused := False;
- Invalidate;
- end;
-
- procedure TDBLookupControl.WMSetFocus(var Message: TMessage);
- begin
- FFocused := True;
- Invalidate;
- end;
-
- { TDBLookupListBox }
-
- constructor TDBLookupListBox.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- ControlStyle := ControlStyle + [csDoubleClicks];
- Width := 121;
- FBorderStyle := bsSingle;
- RowCount := 7;
- end;
-
- procedure TDBLookupListBox.CreateParams(var Params: TCreateParams);
- begin
- inherited CreateParams(Params);
- with Params do
- if FBorderStyle = bsSingle then
- if NewStyleControls and Ctl3D then
- ExStyle := ExStyle or WS_EX_CLIENTEDGE
- else
- Style := Style or WS_BORDER;
- end;
-
- procedure TDBLookupListBox.CreateWnd;
- begin
- inherited CreateWnd;
- UpdateScrollBar;
- end;
-
- function TDBLookupListBox.GetKeyIndex: Integer;
- var
- FieldValue: Variant;
- begin
- if not VarIsNull(FKeyValue) then
- for Result := 0 to FRecordCount - 1 do
- begin
- FListLink.ActiveRecord := Result;
- FieldValue := FKeyField.Value;
- FListLink.ActiveRecord := FRecordIndex;
- if VarEquals(FieldValue, FKeyValue) then Exit;
- end;
- Result := -1;
- end;
-
- procedure TDBLookupListBox.KeyDown(var Key: Word; Shift: TShiftState);
- var
- Delta, KeyIndex: Integer;
- begin
- inherited KeyDown(Key, Shift);
- if CanModify then
- begin
- Delta := 0;
- case Key of
- VK_UP, VK_LEFT: Delta := -1;
- VK_DOWN, VK_RIGHT: Delta := 1;
- VK_PRIOR: Delta := 1 - FRowCount;
- VK_NEXT: Delta := FRowCount - 1;
- VK_HOME: Delta := -Maxint;
- VK_END: Delta := Maxint;
- end;
- if Delta <> 0 then
- begin
- FSearchText := '';
- if Delta = -Maxint then FListLink.DataSet.First else
- if Delta = Maxint then FListLink.DataSet.Last else
- begin
- KeyIndex := GetKeyIndex;
- if KeyIndex >= 0 then
- FListLink.DataSet.MoveBy(KeyIndex - FRecordIndex)
- else
- begin
- KeyValueChanged;
- Delta := 0;
- end;
- FListLink.DataSet.MoveBy(Delta);
- end;
- SelectCurrent;
- end;
- end;
- end;
-
- procedure TDBLookupListBox.KeyPress(var Key: Char);
- begin
- inherited KeyPress(Key);
- ProcessSearchKey(Key);
- end;
-
- procedure TDBLookupListBox.KeyValueChanged;
- begin
- if FListActive and not FLockPosition then
- if not LocateKey then FListLink.DataSet.First;
- end;
-
- procedure TDBLookupListBox.ListLinkActiveChanged;
- begin
- try
- inherited;
- finally
- if FListActive then KeyValueChanged else ListLinkDataChanged;
- end;
- end;
-
- procedure TDBLookupListBox.ListLinkDataChanged;
- begin
- if FListActive then
- begin
- FRecordIndex := FListLink.ActiveRecord;
- FRecordCount := FListLink.RecordCount;
- FKeySelected := not VarIsNull(FKeyValue) or
- not FListLink.DataSet.BOF;
- end else
- begin
- FRecordIndex := 0;
- FRecordCount := 0;
- FKeySelected := False;
- end;
- if HandleAllocated then
- begin
- UpdateScrollBar;
- Invalidate;
- end;
- end;
-
- procedure TDBLookupListBox.MouseDown(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer);
- begin
- if Button = mbLeft then
- begin
- FSearchText := '';
- if not FPopup then
- begin
- SetFocus;
- if not FFocused then Exit;
- end;
- if CanModify then
- if ssDouble in Shift then
- begin
- if FRecordIndex = Y div GetTextHeight then DblClick;
- end else
- begin
- MouseCapture := True;
- FTracking := True;
- SelectItemAt(X, Y);
- end;
- end;
- inherited MouseDown(Button, Shift, X, Y);
- end;
-
- procedure TDBLookupListBox.MouseMove(Shift: TShiftState; X, Y: Integer);
- begin
- if FTracking then
- begin
- SelectItemAt(X, Y);
- FMousePos := Y;
- TimerScroll;
- end;
- inherited MouseMove(Shift, X, Y);
- end;
-
- procedure TDBLookupListBox.MouseUp(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer);
- begin
- if FTracking then
- begin
- StopTracking;
- SelectItemAt(X, Y);
- end;
- inherited MouseUp(Button, Shift, X, Y);
- end;
-
- procedure TDBLookupListBox.Paint;
- var
- I, J, W, X, TextWidth, TextHeight, LastFieldIndex: Integer;
- S: string;
- R: TRect;
- Selected: Boolean;
- Field: TField;
- begin
- Canvas.Font := Font;
- TextWidth := Canvas.TextWidth('0');
- TextHeight := Canvas.TextHeight('0');
- LastFieldIndex := FListFields.Count - 1;
- if ColorToRGB(Color) <> ColorToRGB(clBtnFace) then
- Canvas.Pen.Color := clBtnFace else
- Canvas.Pen.Color := clBtnShadow;
- for I := 0 to FRowCount - 1 do
- begin
- Canvas.Font.Color := Font.Color;
- Canvas.Brush.Color := Color;
- Selected := not FKeySelected and (I = 0);
- R.Top := I * TextHeight;
- R.Bottom := R.Top + TextHeight;
- if I < FRecordCount then
- begin
- FListLink.ActiveRecord := I;
- if not VarIsNull(FKeyValue) and
- VarEquals(FKeyField.Value, FKeyValue) then
- begin
- Canvas.Font.Color := clHighlightText;
- Canvas.Brush.Color := clHighlight;
- Selected := True;
- end;
- R.Right := 0;
- for J := 0 to LastFieldIndex do
- begin
- Field := FListFields[J];
- if J < LastFieldIndex then
- W := Field.DisplayWidth * TextWidth + 4 else
- W := ClientWidth - R.Right;
- S := Field.DisplayText;
- X := 2;
- case Field.Alignment of
- taRightJustify: X := W - Canvas.TextWidth(S) - 3;
- taCenter: X := (W - Canvas.TextWidth(S)) div 2;
- end;
- R.Left := R.Right;
- R.Right := R.Right + W;
- Canvas.TextRect(R, R.Left + X, R.Top, S);
- if J < LastFieldIndex then
- begin
- Canvas.MoveTo(R.Right, R.Top);
- Canvas.LineTo(R.Right, R.Bottom);
- Inc(R.Right);
- if R.Right >= ClientWidth then Break;
- end;
- end;
- end;
- R.Left := 0;
- R.Right := ClientWidth;
- if I >= FRecordCount then Canvas.FillRect(R);
- if Selected and (FFocused or FPopup) then Canvas.DrawFocusRect(R);
- end;
- if FRecordCount <> 0 then FListLink.ActiveRecord := FRecordIndex;
- end;
-
- procedure TDBLookupListBox.SelectCurrent;
- begin
- FLockPosition := True;
- try
- SelectKeyValue(FKeyField.Value);
- finally
- FLockPosition := False;
- end;
- end;
-
- procedure TDBLookupListBox.SelectItemAt(X, Y: Integer);
- var
- Delta: Integer;
- begin
- if Y < 0 then Y := 0;
- if Y >= ClientHeight then Y := ClientHeight - 1;
- Delta := Y div GetTextHeight - FRecordIndex;
- FListLink.DataSet.MoveBy(Delta);
- SelectCurrent;
- end;
-
- procedure TDBLookupListBox.SetBorderStyle(Value: TBorderStyle);
- begin
- if FBorderStyle <> Value then
- begin
- FBorderStyle := Value;
- RecreateWnd;
- RowCount := RowCount;
- end;
- end;
-
- procedure TDBLookupListBox.SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
- var
- BorderSize, TextHeight, Rows: Integer;
- begin
- BorderSize := GetBorderSize;
- TextHeight := GetTextHeight;
- Rows := (AHeight - BorderSize) div TextHeight;
- if Rows < 1 then Rows := 1;
- FRowCount := Rows;
- if FListLink.BufferCount <> Rows then
- begin
- FListLink.BufferCount := Rows;
- ListLinkDataChanged;
- end;
- inherited SetBounds(ALeft, ATop, AWidth, Rows * TextHeight + BorderSize);
- end;
-
- procedure TDBLookupListBox.SetRowCount(Value: Integer);
- begin
- if Value < 1 then Value := 1;
- if Value > 100 then Value := 100;
- Height := Value * GetTextHeight + GetBorderSize;
- end;
-
- procedure TDBLookupListBox.StopTimer;
- begin
- if FTimerActive then
- begin
- KillTimer(Handle, 1);
- FTimerActive := False;
- end;
- end;
-
- procedure TDBLookupListBox.StopTracking;
- begin
- if FTracking then
- begin
- StopTimer;
- FTracking := False;
- MouseCapture := False;
- end;
- end;
-
- procedure TDBLookupListBox.TimerScroll;
- var
- Delta, Distance, Interval: Integer;
- begin
- Delta := 0;
- if FMousePos < 0 then
- begin
- Delta := -1;
- Distance := -FMousePos;
- end;
- if FMousePos >= ClientHeight then
- begin
- Delta := 1;
- Distance := FMousePos - ClientHeight + 1;
- end;
- if Delta = 0 then StopTimer else
- begin
- if FListLink.DataSet.MoveBy(Delta) <> 0 then SelectCurrent;
- Interval := 200 - Distance * 15;
- if Interval < 0 then Interval := 0;
- SetTimer(Handle, 1, Interval, nil);
- FTimerActive := True;
- end;
- end;
-
- procedure TDBLookupListBox.UpdateScrollBar;
- var
- Pos, Max: Integer;
- ScrollInfo: TScrollInfo;
- begin
- Pos := 0;
- Max := 0;
- if FRecordCount = FRowCount then
- begin
- Max := 4;
- if not FListLink.DataSet.BOF then
- if not FListLink.DataSet.EOF then Pos := 2 else Pos := 4;
- end;
- ScrollInfo.cbSize := SizeOf(TScrollInfo);
- ScrollInfo.fMask := SIF_POS or SIF_RANGE;
- if not GetScrollInfo(Handle, SB_VERT, ScrollInfo) or
- (ScrollInfo.nPos <> Pos) or (ScrollInfo.nMax <> Max) then
- begin
- ScrollInfo.nMin := 0;
- ScrollInfo.nMax := Max;
- ScrollInfo.nPos := Pos;
- SetScrollInfo(Handle, SB_VERT, ScrollInfo, True);
- end;
- end;
-
- procedure TDBLookupListBox.CMCtl3DChanged(var Message: TMessage);
- begin
- if NewStyleControls and (FBorderStyle = bsSingle) then
- begin
- RecreateWnd;
- RowCount := RowCount;
- end;
- inherited;
- end;
-
- procedure TDBLookupListBox.CMFontChanged(var Message: TMessage);
- begin
- inherited;
- Height := Height;
- end;
-
- procedure TDBLookupListBox.WMCancelMode(var Message: TMessage);
- begin
- StopTracking;
- inherited;
- end;
-
- procedure TDBLookupListBox.WMTimer(var Message: TMessage);
- begin
- TimerScroll;
- end;
-
- procedure TDBLookupListBox.WMVScroll(var Message: TWMVScroll);
- begin
- FSearchText := '';
- with Message, FListLink.DataSet do
- case ScrollCode of
- SB_LINEUP: MoveBy(-FRecordIndex - 1);
- SB_LINEDOWN: MoveBy(FRecordCount - FRecordIndex);
- SB_PAGEUP: MoveBy(-FRecordIndex - FRecordCount + 1);
- SB_PAGEDOWN: MoveBy(FRecordCount - FRecordIndex + FRecordCount - 2);
- SB_THUMBPOSITION:
- begin
- case Pos of
- 0: First;
- 1: MoveBy(-FRecordIndex - FRecordCount + 1);
- 2: Exit;
- 3: MoveBy(FRecordCount - FRecordIndex + FRecordCount - 2);
- 4: Last;
- end;
- end;
- SB_BOTTOM: Last;
- SB_TOP: First;
- end;
- end;
-
- { TPopupDataList }
-
- constructor TPopupDataList.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- ControlStyle := ControlStyle + [csNoDesignVisible, csReplicatable];
- FPopup := True;
- end;
-
- procedure TPopupDataList.CreateParams(var Params: TCreateParams);
- begin
- inherited CreateParams(Params);
- with Params do
- begin
- Style := WS_POPUP or WS_BORDER;
- ExStyle := WS_EX_TOOLWINDOW;
- WindowClass.Style := CS_SAVEBITS;
- end;
- end;
-
- procedure TPopupDataList.WMMouseActivate(var Message: TMessage);
- begin
- Message.Result := MA_NOACTIVATE;
- end;
-
- { TDBLookupComboBox }
-
- constructor TDBLookupComboBox.Create(AOwner: TComponent);
- begin
- inherited Create(AOwner);
- ControlStyle := ControlStyle + [csReplicatable];
- Width := 145;
- Height := 0;
- FDataList := TPopupDataList.Create(Self);
- FDataList.Visible := False;
- FDataList.Parent := Self;
- FDataList.OnMouseUp := ListMouseUp;
- FButtonWidth := GetSystemMetrics(SM_CXVSCROLL);
- FDropDownRows := 7;
- end;
-
- procedure TDBLookupComboBox.CloseUp(Accept: Boolean);
- var
- ListValue: Variant;
- begin
- if FListVisible then
- begin
- if GetCapture <> 0 then SendMessage(GetCapture, WM_CANCELMODE, 0, 0);
- ListValue := FDataList.KeyValue;
- SetWindowPos(FDataList.Handle, 0, 0, 0, 0, 0, SWP_NOZORDER or
- SWP_NOMOVE or SWP_NOSIZE or SWP_NOACTIVATE or SWP_HIDEWINDOW);
- FListVisible := False;
- FDataList.ListSource := nil;
- Invalidate;
- FSearchText := '';
- if Accept and CanModify then SelectKeyValue(ListValue);
- if Assigned(FOnCloseUp) then FOnCloseUp(Self);
- end;
- end;
-
- procedure TDBLookupComboBox.CreateParams(var Params: TCreateParams);
- begin
- inherited CreateParams(Params);
- with Params do
- if NewStyleControls and Ctl3D then
- ExStyle := ExStyle or WS_EX_CLIENTEDGE
- else
- Style := Style or WS_BORDER;
- end;
-
- procedure TDBLookupComboBox.DropDown;
- var
- P: TPoint;
- I, Y: Integer;
- S: string;
- begin
- if not FListVisible and FListActive then
- begin
- if Assigned(FOnDropDown) then FOnDropDown(Self);
- FDataList.Color := Color;
- FDataList.Font := Font;
- if FDropDownWidth > 0 then
- FDataList.Width := FDropDownWidth else
- FDataList.Width := Width;
- FDataList.ReadOnly := not CanModify;
- FDataList.RowCount := FDropDownRows;
- FDataList.KeyField := FKeyFieldName;
- for I := 0 to FListFields.Count - 1 do
- S := S + TField(FListFields[I]).FieldName + ';';
- FDataList.ListField := S;
- FDataList.ListFieldIndex := FListFields.IndexOf(FListField);
- FDataList.ListSource := FListLink.DataSource;
- FDataList.KeyValue := KeyValue;
- P := Parent.ClientToScreen(Point(Left, Top));
- Y := P.Y + Height;
- if Y + FDataList.Height > Screen.Height then Y := P.Y - FDataList.Height;
- case FDropDownAlign of
- daRight: Dec(P.X, FDataList.Width - Width);
- daCenter: Dec(P.X, (FDataList.Width - Width) div 2);
- end;
- SetWindowPos(FDataList.Handle, HWND_TOP, P.X, Y, 0, 0,
- SWP_NOSIZE or SWP_NOACTIVATE or SWP_SHOWWINDOW);
- FListVisible := True;
- Repaint;
- end;
- end;
-
- procedure TDBLookupComboBox.KeyDown(var Key: Word; Shift: TShiftState);
- var
- Delta: Integer;
- begin
- inherited KeyDown(Key, Shift);
- if FListActive and ((Key = VK_UP) or (Key = VK_DOWN)) then
- if ssAlt in Shift then
- begin
- if FListVisible then CloseUp(True) else DropDown;
- Key := 0;
- end else
- if not FListVisible then
- begin
- if not LocateKey then
- FListLink.DataSet.First
- else
- begin
- if Key = VK_UP then Delta := -1 else Delta := 1;
- FListLink.DataSet.MoveBy(Delta);
- end;
- SelectKeyValue(FKeyField.Value);
- Key := 0;
- end;
- if (Key <> 0) and FListVisible then FDataList.KeyDown(Key, Shift);
- end;
-
- procedure TDBLookupComboBox.KeyPress(var Key: Char);
- begin
- inherited KeyPress(Key);
- if FListVisible then
- if Key in [#13, #27] then
- CloseUp(Key = #13)
- else
- FDataList.KeyPress(Key)
- else
- ProcessSearchKey(Key);
- end;
-
- procedure TDBLookupComboBox.KeyValueChanged;
- begin
- if FLookupMode then
- begin
- FText := FDataField.DisplayText;
- FAlignment := FDataField.Alignment;
- end else
- if FListActive and LocateKey then
- begin
- FText := FListField.DisplayText;
- FAlignment := FListField.Alignment;
- end else
- begin
- FText := '';
- FAlignment := taLeftJustify;
- end;
- Invalidate;
- end;
-
- procedure TDBLookupComboBox.ListLinkActiveChanged;
- begin
- inherited;
- KeyValueChanged;
- end;
-
- procedure TDBLookupComboBox.ListMouseUp(Sender: TObject; Button: TMouseButton;
- Shift: TShiftState; X, Y: Integer);
- begin
- if Button = mbLeft then
- CloseUp(PtInRect(FDataList.ClientRect, Point(X, Y)));
- end;
-
- procedure TDBLookupComboBox.MouseDown(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer);
- begin
- if Button = mbLeft then
- begin
- SetFocus;
- if not FFocused then Exit;
- if FListVisible then CloseUp(False) else
- if FListActive then
- begin
- MouseCapture := True;
- FTracking := True;
- TrackButton(X, Y);
- DropDown;
- end;
- end;
- inherited MouseDown(Button, Shift, X, Y);
- end;
-
- procedure TDBLookupComboBox.MouseMove(Shift: TShiftState; X, Y: Integer);
- var
- ListPos: TPoint;
- MousePos: TSmallPoint;
- begin
- if FTracking then
- begin
- TrackButton(X, Y);
- if FListVisible then
- begin
- ListPos := FDataList.ScreenToClient(ClientToScreen(Point(X, Y)));
- if PtInRect(FDataList.ClientRect, ListPos) then
- begin
- StopTracking;
- MousePos := PointToSmallPoint(ListPos);
- SendMessage(FDataList.Handle, WM_LBUTTONDOWN, 0, Integer(MousePos));
- Exit;
- end;
- end;
- end;
- inherited MouseMove(Shift, X, Y);
- end;
-
- procedure TDBLookupComboBox.MouseUp(Button: TMouseButton; Shift: TShiftState;
- X, Y: Integer);
- begin
- StopTracking;
- inherited MouseUp(Button, Shift, X, Y);
- end;
-
- procedure TDBLookupComboBox.Paint;
- var
- W, X, Flags: Integer;
- Text: string;
- Alignment: TAlignment;
- Selected: Boolean;
- R: TRect;
- begin
- Canvas.Font := Font;
- Canvas.Brush.Color := Color;
- Selected := FFocused and not FListVisible and
- not (csPaintCopy in ControlState);
- if Selected then
- begin
- Canvas.Font.Color := clHighlightText;
- Canvas.Brush.Color := clHighlight;
- end;
- if (csPaintCopy in ControlState) and (FDataField <> nil) then
- begin
- Text := FDataField.DisplayText;
- Alignment := FDataField.Alignment;
- end else
- begin
- Text := FText;
- Alignment := FAlignment;
- end;
- W := ClientWidth - FButtonWidth;
- X := 2;
- case Alignment of
- taRightJustify: X := W - Canvas.TextWidth(Text) - 3;
- taCenter: X := (W - Canvas.TextWidth(Text)) div 2;
- end;
- SetRect(R, 1, 1, W - 1, ClientHeight - 1);
- Canvas.TextRect(R, X, 2, Text);
- if Selected then Canvas.DrawFocusRect(R);
- SetRect(R, W, 0, ClientWidth, ClientHeight);
- if not FListActive then
- Flags := DFCS_SCROLLCOMBOBOX or DFCS_INACTIVE
- else if FPressed then
- Flags := DFCS_SCROLLCOMBOBOX or DFCS_FLAT or DFCS_PUSHED
- else
- Flags := DFCS_SCROLLCOMBOBOX;
- DrawFrameControl(Canvas.Handle, R, DFC_SCROLL, Flags);
- end;
-
- procedure TDBLookupComboBox.SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
- begin
- inherited SetBounds(ALeft, ATop, AWidth, GetTextHeight + GetBorderSize + 4);
- end;
-
- procedure TDBLookupComboBox.StopTracking;
- begin
- if FTracking then
- begin
- TrackButton(-1, -1);
- FTracking := False;
- MouseCapture := False;
- end;
- end;
-
- procedure TDBLookupComboBox.TrackButton(X, Y: Integer);
- var
- NewState: Boolean;
- begin
- NewState := PtInRect(Rect(ClientWidth - FButtonWidth, 0, ClientWidth,
- ClientHeight), Point(X, Y));
- if FPressed <> NewState then
- begin
- FPressed := NewState;
- Repaint;
- end;
- end;
-
- procedure TDBLookupComboBox.CMCancelMode(var Message: TCMCancelMode);
- begin
- if (Message.Sender <> Self) and (Message.Sender <> FDataList) then
- CloseUp(False);
- end;
-
- procedure TDBLookupComboBox.CMCtl3DChanged(var Message: TMessage);
- begin
- if NewStyleControls then
- begin
- RecreateWnd;
- Height := 0;
- end;
- inherited;
- end;
-
- procedure TDBLookupComboBox.CMFontChanged(var Message: TMessage);
- begin
- inherited;
- Height := 0;
- end;
-
- procedure TDBLookupComboBox.CMGetDataLink(var Message: TMessage);
- begin
- Message.Result := Integer(FDataLink);
- end;
-
- procedure TDBLookupComboBox.WMCancelMode(var Message: TMessage);
- begin
- StopTracking;
- inherited;
- end;
-
- procedure TDBLookupComboBox.WMKillFocus(var Message: TWMKillFocus);
- begin
- inherited;
- CloseUp(False);
- end;
-
- end.
-