fixed compilation and added a test for OnErase() to the sample

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15392 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/erase/erase.cpp

@@ -71,10 +71,10 @@ class MyCanvas : public wxScrolledWindow
 {
 public:
     MyCanvas( MyFrame *parent );
-    
+
     void OnPaint( wxPaintEvent &event );
     void OnEraseBackground( wxEraseEvent &event );
-    
+
     wxBitmap    m_bitmap;
 
 private:
@@ -101,11 +101,11 @@ IMPLEMENT_APP(MyApp)
 
 bool MyApp::OnInit()
 {
-    MyFrame *frame = new MyFrame("Minimal wxWindows App",
+    MyFrame *frame = new MyFrame(_T("Minimal wxWindows App"),
                                  wxPoint(50, 50), wxSize(450, 340));
 
     frame->Show(TRUE);
-    
+
     return TRUE;
 }
 
@@ -131,20 +131,20 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
     wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF);
 
     wxMenu *helpMenu = new wxMenu;
-    helpMenu->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");
+    helpMenu->Append(Minimal_About, _T("&About...\tCtrl-A"), _T("Show about dialog"));
 
-    menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
+    menuFile->Append(Minimal_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
 
     wxMenuBar *menuBar = new wxMenuBar();
-    menuBar->Append(menuFile, "&File");
+    menuBar->Append(menuFile, _T("&File"));
-    menuBar->Append(helpMenu, "&Help");
+    menuBar->Append(helpMenu, _T("&Help"));
 
     SetMenuBar(menuBar);
 
 #if wxUSE_STATUSBAR
     // create a status bar just for fun (by default with 1 pane only)
     CreateStatusBar(2);
-    SetStatusText("Welcome to wxWindows!");
+    SetStatusText(_T("Welcome to wxWindows erase sample!"));
 #endif // wxUSE_STATUSBAR
 
     (void)new MyCanvas( this );
@@ -158,11 +158,8 @@ void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 
 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 {
-    wxString msg;
+    wxMessageBox(_T("This sample shows how you can draw custom background."),
-    msg.Printf( _T("This is the about dialog of the Erase sample.\n")
+                 _T("About Erase Sample"), wxOK | wxICON_INFORMATION, this);
-                _T("Welcome to %s"), wxVERSION_STRING);
-
-    wxMessageBox(msg, "About Erase", wxOK | wxICON_INFORMATION, this);
 }
 
 
@@ -172,13 +169,15 @@ BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
 END_EVENT_TABLE()
 
 MyCanvas::MyCanvas( MyFrame *parent )
- : wxScrolledWindow( parent, -1, wxDefaultPosition, wxDefaultSize, 
+        : wxScrolledWindow( parent, -1, wxDefaultPosition, wxDefaultSize,
-                    wxScrolledWindowStyle|wxNO_FULL_REPAINT_ON_RESIZE|wxSUNKEN_BORDER )
+                            wxScrolledWindowStyle |
+                            wxNO_FULL_REPAINT_ON_RESIZE|
+                            wxSUNKEN_BORDER )
 {
     SetScrollbars( 10, 10, 40, 100, 0, 0 );
-    
+
-    m_bitmap = wxBitmap( mondrian_xpm );
+    m_bitmap = wxBitmap( wxICON(mondrian) );
-    
+
     new wxStaticBitmap( this, -1, m_bitmap, wxPoint(80,20) );
 }
 
@@ -186,13 +185,16 @@ void MyCanvas::OnPaint( wxPaintEvent &event )
 {
     wxPaintDC dc(this);
     PrepareDC( dc );
-    
+
     dc.SetBrush( *wxBLACK_BRUSH );
     dc.DrawRectangle( 0,0,200,50 );
-    
+
     dc.DrawBitmap( m_bitmap, 10, 20, TRUE );
-    
+
-#if 0  
+    dc.SetTextForeground(*wxBLUE);
+    dc.DrawText(_T("This text is drawn from OnPaint"), 65, 65);
+
+#if 0
     wxRegionIterator upd( GetUpdateRegion() );
     while (upd)
     {
@@ -207,27 +209,28 @@ void MyCanvas::OnPaint( wxPaintEvent &event )
     wxLogDebug( "size %d %d client_size %d %d", size.x, size.y, client_size.x, client_size.y );
 #endif
 
+#if 0
     int i;
     dc.SetPen( *wxWHITE_PEN );
     for (i = 0; i < 20; i += 2)
        dc.DrawLine( i,i, i+100,i );
-    
+
     dc.SetPen( *wxWHITE_PEN );
     for (i = 200; i < 220; i += 2)
        dc.DrawLine( i-200,i, i-100,i );
-    
+
     wxRegion region( 110, 110, 80, 80 );
     wxRegion hole( 130, 130, 40, 1 );
     region.Intersect( hole );
     dc.SetClippingRegion( region );
-    
+
     dc.SetBrush( *wxRED_BRUSH );
     dc.DrawRectangle( 100, 100, 200, 200 );
-    
+
     dc.DestroyClippingRegion();
 
     dc.SetPen( *wxTRANSPARENT_PEN );
-    
+
     wxRegion strip( 110, 200, 30, 1 );
     wxRegionIterator it( strip );
     while (it)
@@ -235,10 +238,29 @@ void MyCanvas::OnPaint( wxPaintEvent &event )
         dc.DrawRectangle( it.GetX(), it.GetY(), it.GetWidth(), it.GetHeight() );
         it ++;
     }
+#endif // 0
 }
 
-void MyCanvas::OnEraseBackground( wxEraseEvent &event )
+void MyCanvas::OnEraseBackground( wxEraseEvent& event )
 {
-    event.Skip( TRUE );
+    wxDC& dc = *event.GetDC();
+    dc.SetPen(*wxGREEN_PEN);
+
+    // this line is needed, otherwise the junk is left on win the background
+    dc.Clear();
+
+    wxSize size = GetClientSize();
+    for ( int x = 0; x < size.x; x+= 10 )
+    {
+        dc.DrawLine(x, 0, x, size.y);
+    }
+
+    for ( int y = 0; y < size.y; y+= 10 )
+    {
+        dc.DrawLine(0, y, size.x, y);
+    }
+
+    dc.SetTextForeground(*wxRED);
+    dc.DrawText(_T("This text is drawn from OnEraseBackground"), 60, 60);
 }