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STEP04.PAS
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Pascal/Delphi Source File
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1991-05-21
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3KB
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109 lines
{************************************************}
{ }
{ Turbo Pascal for Windows }
{ Demo program }
{ Copyright (c) 1991 by Borland International }
{ }
{************************************************}
program MyProgram;
uses Strings, WinTypes, WinProcs, WObjects;
type
TMyApplication = object(TApplication)
procedure InitMainWindow; virtual;
end;
type
PMyWindow = ^TMyWindow;
TMyWindow = object(TWindow)
DragDC: HDC;
ButtonDown: Boolean;
constructor Init(AParent: PWindowsObject; ATitle: PChar);
function CanClose: Boolean; virtual;
procedure WMLButtonDown(var Msg: TMessage);
virtual wm_First + wm_LButtonDown;
procedure WMLButtonUp(var Msg: TMessage);
virtual wm_First + wm_LButtonUp;
procedure WMMouseMove(var Msg: TMessage);
virtual wm_First + wm_MouseMove;
procedure WMRButtonDown(var Msg: TMessage);
virtual wm_First + wm_RButtonDown;
end;
{--------------------------------------------------}
{ TMyWindow's method implementations: }
{--------------------------------------------------}
constructor TMyWindow.Init(AParent: PWindowsObject; ATitle: PChar);
begin
TWindow.Init(AParent, ATitle);
ButtonDown := False;
end;
function TMyWindow.CanClose: Boolean;
var
Reply: Integer;
begin
CanClose := True;
Reply := MessageBox(HWindow, 'Do you want to save?',
'Drawing has changed', mb_YesNo or mb_IconQuestion);
if Reply = id_Yes then CanClose := False;
end;
procedure TMyWindow.WMLButtonDown(var Msg: TMessage);
begin
InvalidateRect(HWindow, nil, True);
if not ButtonDown then
begin
ButtonDown := True;
SetCapture(HWindow);
DragDC := GetDC(HWindow);
MoveTo(DragDC, Msg.LParamLo, Msg.LParamHi);
end;
end;
procedure TMyWindow.WMMouseMove(var Msg: TMessage);
begin
if ButtonDown then
LineTo(DragDC, Integer(Msg.LParamLo), Integer(Msg.LParamHi));
end;
procedure TMyWindow.WMLButtonUp(var Msg: TMessage);
begin
if ButtonDown then
begin
ButtonDown := False;
ReleaseCapture;
ReleaseDC(HWindow, DragDC);
end;
end;
procedure TMyWindow.WMRButtonDown(var Msg: TMessage);
begin
InvalidateRect(HWindow, nil, True);
end;
{--------------------------------------------------}
{ TMyApplication's method implementations: }
{--------------------------------------------------}
procedure TMyApplication.InitMainWindow;
begin
MainWindow := New(PMyWindow, Init(nil, 'Sample ObjectWindows Program'));
end;
{--------------------------------------------------}
{ Main program: }
{--------------------------------------------------}
var
MyApp: TMyApplication;
begin
MyApp.Init('MyProgram');
MyApp.Run;
MyApp.Done;
end.