PC Pro 1999 February/DPPCPRO0299.ISO/February/Delphi/Install/DATA.Z/DDEREG.PAS

Pascal/Delphi Source File | 1996-06-11 | 6.2 KB | 251 lines

unit DDEReg;

interface

uses Windows, SysUtils, Classes, Graphics, Forms, Controls, Buttons, TypInfo,
  DsgnIntf, DdeMan, Messages, StdCtrls, LibMain, ExtCtrls;

{  TComponentEditors }

type
  TSrvrConvEdit = class(TDefaultEditor)
  protected
    procedure EditProperty(PropertyEditor: TPropertyEditor;
      var Continue, FreeEditor: Boolean); override;
  end;

  TCliConvEdit = class(TDefaultEditor)
  protected
    procedure EditProperty(PropertyEditor: TPropertyEditor;
      var Continue, FreeEditor: Boolean); override;
  end;

  TSrvrItemEdit = class(TDefaultEditor)
  public
    procedure Copy; override;
  end;


{  TForms }
type
  TDdeLinkDlg = class(TForm)
    TopicEdit: TEdit;
    AppEdit: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    OK: TButton;
    CancelBtn: TButton;
    PasteBtn: TButton;
    HelpBtn: TButton;
    procedure doPasteLink(Sender: TObject);
    procedure DoPasteCheck(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure HelpBtnClick(Sender: TObject);
  private
    procedure WMActivate(var Message: TWMActivate); message WM_ACTIVATE;
  end;


  TDdeLinkInfoProperty = class(TPropertyEditor)
  public
    function GetAttributes: TPropertyAttributes; override;
    procedure Edit; override;
    function  GetValue: string; override;
  end;

  TDdeClientItemProperty = class(TStringProperty)
  public
    function GetAttributes: TPropertyAttributes; override;
    procedure GetValues(Proc: TGetStrProc); override;
  end;

  { Dde Helper Delegate }
  TLibDde = class (TLibDdeHelper)
  public
    procedure SetProjectName (Name : String);  override;
  end;

procedure Register;
{}

implementation

uses Dialogs, LibConst, Consts, LibHelp;

{$R *.DFM}
{---------------------------------------}

procedure TSrvrConvEdit.EditProperty(PropertyEditor: TPropertyEditor;
  var Continue, FreeEditor: Boolean);
var
  PropName: string;
begin
  PropName := PropertyEditor.GetName;
  if (CompareText(PropName, 'ONEXECUTEMACRO') = 0) then
  begin
    PropertyEditor.Edit;
    Continue := False;
  end
  else
    inherited EditProperty(PropertyEditor, Continue, FreeEditor);
end;


procedure TCliConvEdit.EditProperty(PropertyEditor: TPropertyEditor;
  var Continue, FreeEditor: Boolean);
var
  PropName: string;
begin
  PropName := PropertyEditor.GetName;
  if (CompareText(PropName, 'ONOPEN') = 0) then
  begin
    PropertyEditor.Edit;
    Continue := False;
  end
  else
    inherited EditProperty(PropertyEditor, Continue, FreeEditor);
end;

procedure TSrvrItemEdit.Copy;
begin
  TDdeServerItem(Component).CopyToClipboard;
end;


{---------------------------------------}
{ TDdeLinkInfoProperty }

function TDdeLinkInfoProperty.GetAttributes: TPropertyAttributes;
begin
  Result := inherited GetAttributes + [paDialog, paReadOnly]
                      - [paMultiSelect, paSubProperties];
end;

function TDdeLinkInfoProperty.GetValue: string;
begin
  if GetStrValue = '' then Result := LoadStr(SDdeEmptyConnection)
  else Result := Format ('(%s)', [GetStrValue]);
end;

procedure TDdeLinkInfoProperty.Edit;
var
  DdeCli      : TDdeClientConv;
  LinkDlg     : TDdeLinkDlg;
begin
  DdeCli := TDdeClientConv (GetComponent(0));
  LinkDlg := TDdeLinkDlg.Create(Application);
  try
    LinkDlg.AppEdit.Text    :=   DdeCli.DdeService;
    LinkDlg.TopicEdit.Text  :=   DdeCli.DdeTopic;

    if LinkDlg.ShowModal = idOk then
    begin
      if Not DdeCli.SetLink(LinkDlg.AppEdit.Text,
                            LinkDlg.TopicEdit.Text) then
        MessageDlg(LoadStr(SDdeNoConnect), mtError, [mbOK], 0);
      Modified;
    end;
  finally
    LinkDlg.Free;
  end;
end;

{---------------------------------------}

procedure TDdeLinkDlg.doPasteLink(Sender: TObject);
var
  Service, Topic, Item : String;
begin
  if  GetPasteLinkInfo (Service, Topic, Item) = True  then
  begin
    AppEdit.Text   := Service;
    TopicEdit.Text := Topic;
  end
  else
  begin
    AppEdit.Text   := EmptyStr;
    TopicEdit.Text := EmptyStr;
  end;
end;

procedure TDdeLinkDlg.DoPasteCheck(Sender: TObject);
var
  enable : Boolean;
  Service, Topic, Item : String;
begin
  enable := False;
  if  GetPasteLinkInfo (Service, Topic, Item) = True  then
    enable := True;
  if enable <> PasteBtn.Enabled then
    PasteBtn.Enabled := enable;
end;

procedure TDdeLinkDlg.WMActivate(var Message: TWMActivate);
begin
  inherited;
  if Message.Active <> WA_INACTIVE then DoPasteCheck(Self);
end;

procedure TDdeLinkDlg.FormCreate(Sender: TObject);
begin
  HelpContext := hcDDDEInfo;
end;

procedure TDdeLinkDlg.HelpBtnClick(Sender: TObject);
begin
  Application.HelpContext(HelpContext);
end;

{-------}
{ TDdeClientItemProperty }

function TDdeClientItemProperty.GetAttributes: TPropertyAttributes;
begin
  Result := inherited GetAttributes + [paValueList] - [paMultiSelect,
    paSubProperties];
end;

procedure TDdeClientItemProperty.GetValues(Proc: TGetStrProc);
var
  Cli  : TDdeClientConv;
  Service, Topic, Item : String;
begin
  Cli := TDdeClientConv(TDdeClientItem (GetComponent(0)).DdeConv);
  if Cli <> Nil then
  begin
    if  GetPasteLinkInfo (Service, Topic, Item) = True  then
    begin
      if (Service = Cli.DdeService) and
         (Topic = Cli.DdeTopic) then
        Proc (Item);
    end;
  end;
end;

{---------------------------------------}

procedure TLibDde.SetProjectName (Name : String);
begin
  if Length (Name) <> 0 then
    ddeMgr.AppName := Name
  else
    ddeMgr.AppName := ddeMgr.GetExeName;
end;

{---------------------------------------}

procedure Register;
begin
  LibDdeHelper := TLibDde.Create;
  RegisterComponents(LoadStr(srSystem),
            [TDdeClientConv, TDdeClientItem, TDdeServerConv, TDdeServerItem]);
  RegisterPropertyEditor(TypeInfo(string), TDdeClientConv, 'DdeService', TDdeLinkInfoProperty);
  RegisterPropertyEditor(TypeInfo(string), TDdeClientConv, 'DdeTopic', TDdeLinkInfoProperty);
  RegisterPropertyEditor(TypeInfo(string), TDdeClientItem, 'DdeItem', TDdeClientItemProperty);
  RegisterComponentEditor(TDdeServerItem, TSrvrItemEdit);
  RegisterComponentEditor(TDdeServerConv, TSrvrConvEdit);
  RegisterComponentEditor(TDdeClientConv, TCliConvEdit);
end;

end.