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- //----------------------------------------------------------------------------
- // ObjectWindows - (C) Copyright 1991, 1994 by Borland International
- // Tutorial application -- step04.cpp
- //----------------------------------------------------------------------------
- #include <owl/owlpch.h>
- #include <owl/applicat.h>
- #include <owl/framewin.h>
- #include <owl/dc.h>
-
- class TDrawWindow : public TWindow {
- public:
- TDrawWindow(TWindow* parent = 0);
- ~TDrawWindow()
- {
- delete DragDC;
- }
-
- protected:
- TDC* DragDC;
-
- // Override member function of TWindow
- bool CanClose();
-
- // Message response functions
- void EvLButtonDown(uint, TPoint&);
- void EvRButtonDown(uint, TPoint&);
- void EvMouseMove(uint, TPoint&);
- void EvLButtonUp(uint, TPoint&);
-
- DECLARE_RESPONSE_TABLE(TDrawWindow);
- };
-
- DEFINE_RESPONSE_TABLE1(TDrawWindow, TWindow)
- EV_WM_LBUTTONDOWN,
- EV_WM_RBUTTONDOWN,
- EV_WM_MOUSEMOVE,
- EV_WM_LBUTTONUP,
- END_RESPONSE_TABLE;
-
- TDrawWindow::TDrawWindow(TWindow* parent)
- {
- Init(parent, 0, 0);
- DragDC = 0;
- }
-
- bool
- TDrawWindow::CanClose()
- {
- return MessageBox("Do you want to save?", "Drawing has changed",
- MB_YESNO | MB_ICONQUESTION) == IDNO;
- }
-
- void
- TDrawWindow::EvLButtonDown(uint, TPoint& point)
- {
- Invalidate();
-
- if (!DragDC) {
- SetCapture();
- DragDC = new TClientDC(*this);
- DragDC->MoveTo(point);
- }
- }
-
- void
- TDrawWindow::EvRButtonDown(uint, TPoint&)
- {
- Invalidate();
- }
-
- void
- TDrawWindow::EvMouseMove(uint, TPoint& point)
- {
- if (DragDC)
- DragDC->LineTo(point);
- }
-
- void
- TDrawWindow::EvLButtonUp(uint, TPoint&)
- {
- if (DragDC) {
- ReleaseCapture();
- delete DragDC;
- DragDC = 0;
- }
- }
-
- class TDrawApp : public TApplication {
- public:
- TDrawApp() : TApplication() {}
-
- void InitMainWindow()
- {
- SetMainWindow(new TFrameWindow(0, "Drawing Pad", new TDrawWindow));
- }
- };
-
- int
- OwlMain(int /*argc*/, char* /*argv*/ [])
- {
- return TDrawApp().Run();
- }
-