Category : Pascal Source Code
Archive   : PASTIPS.ZIP
Filename : DBLCLICK.PAS

{************************************************}
{ }
{ Turbo Pascal for Windows }
{ Tips & Techniques Demo Program }
{ Copyright (c) 1991 by Borland International }
{ }
{************************************************}

program DblClick;

uses WinTypes, WinProcs, WObjects;

type
TApp = object(TApplication)
procedure InitMainWindow; virtual;
end;

PMyWindow = ^TMyWindow;
TMyWindow = Object(TWindow)
constructor Init(AParent: PWindowsObject; ATitle: PChar);
procedure Paint(PaintDC: HDC; var PaintInfo :TPaintStruct); virtual;
function GetClassName: PChar; virtual;
procedure GetWindowClass(var AWndClass: TWndClass); virtual;
procedure DblClk(var Message: TMessage);
virtual wm_lButtonDblClk;
end;

procedure TApp.InitMainWindow;
begin
MainWindow := New(PMyWindow, Init(Nil, 'Double Click'));
end;

constructor TMyWindow.Init(AParent: PWindowsObject; ATitle: PChar);
begin
TWindow.Init(AParent, ATitle);
end;
procedure TMyWindow.Paint(PaintDC: HDC; var PaintInfo :TPaintStruct);
begin
TWindow.Paint(PaintDC, PaintInfo);
TextOut(PaintDC, 30, 30, 'Please Double Click in the Client Region'#0,
40);
end;

function TMyWindow.GetClassName: PChar;
begin
GetClassName := 'DoubleClickDemoWindow';
end;

procedure TMyWindow.GetWindowClass(var AWndClass: TWndClass);
begin
TWindow.GetWindowClass(AWndClass);
AWndClass.Style := AWndClass.Style or cs_DblClks;
end;

procedure TMyWindow.DblClk(var Message: TMessage);
begin
MessageBox(HWindow, 'Double Click', 'Message', mb_Ok);
end;

var
App: TApp;

begin
App.Init('DblClick');
App.Run;
App.Done;
end.