More initial reviews of d* interface headers.

[wxWidgets.git] / samples / erase / erase.cpp

diff --git a/samples/erase/erase.cpp b/samples/erase/erase.cpp
index 54c6dfbbbceed09965231ebf0b78b761136706f7..94dd570ec49a50f0f76025118c2e69bab97ef71b 100644 (file)
--- a/samples/erase/erase.cpp
+++ b/samples/erase/erase.cpp
@@ -1,6 +1,6 @@
 /////////////////////////////////////////////////////////////////////////////
 // Name:        erase.cpp
 /////////////////////////////////////////////////////////////////////////////
 // Name:        erase.cpp

-// Purpose:     Erase wxWindows sample
+// Purpose:     Erase wxWidgets sample

 // Author:      Robert Roebling
 // Modified by:
 // Created:     04/01/98
 // Author:      Robert Roebling
 // Modified by:
 // Created:     04/01/98


@@ -17,11 +17,6 @@
 // headers
 // ----------------------------------------------------------------------------
 
 // headers
 // ----------------------------------------------------------------------------
 

-#ifdef __GNUG__
-    #pragma implementation "erase.cpp"
-    #pragma interface "erase.cpp"
-#endif
-

 // For compilers that support precompilation, includes "wx/wx.h".
 #include "wx/wxprec.h"
 
 // For compilers that support precompilation, includes "wx/wx.h".
 #include "wx/wxprec.h"
 


@@ -30,7 +25,7 @@
 #endif
 
 // for all others, include the necessary headers (this file is usually all you
 #endif
 
 // for all others, include the necessary headers (this file is usually all you

-// need because it includes almost all "standard" wxWindows headers)
+// need because it includes almost all "standard" wxWidgets headers)

 #ifndef WX_PRECOMP
     #include "wx/wx.h"
 #endif
 #ifndef WX_PRECOMP
     #include "wx/wx.h"
 #endif


@@ -54,31 +49,52 @@ public:
 };
 
 
 };
 
 

-class MyFrame : public wxFrame
+class MyCanvas : public wxScrolledWindow

 {
 public:
 {
 public:

-    MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
+    MyCanvas( wxFrame *parent );

 
 

-    void OnQuit(wxCommandEvent& event);
-    void OnAbout(wxCommandEvent& event);
+    void UseBuffer(bool useBuffer) { m_useBuffer = useBuffer; Refresh(); }
+    void EraseBg(bool eraseBg) { m_eraseBg = eraseBg; Refresh(); }

 
 private:
 
 private:

+    void OnPaint( wxPaintEvent &event );
+    void OnChar( wxKeyEvent &event );
+    void OnEraseBackground( wxEraseEvent &event );
+
+    void DoPaint(wxDC& dc);
+
+
+    wxBitmap    m_bitmap;
+    wxString    m_text;
+
+    // use wxMemoryDC in OnPaint()?
+    bool m_useBuffer;
+
+    // paint custom background in OnEraseBackground()?
+    bool m_eraseBg;
+
+

     DECLARE_EVENT_TABLE()
 };
 
     DECLARE_EVENT_TABLE()
 };
 

-
-class MyCanvas : public wxScrolledWindow
+class MyFrame : public wxFrame

 {
 public:
 {
 public:

-    MyCanvas( MyFrame *parent );
-    
-    void OnPaint( wxPaintEvent &event );
-    void OnEraseBackground( wxEraseEvent &event );
+    MyFrame();
+
+    void OnUseBuffer(wxCommandEvent& event);
+    void OnEraseBg(wxCommandEvent& event);
+    void OnQuit(wxCommandEvent& event);
+    void OnAbout(wxCommandEvent& event);

 
 private:
 
 private:

+    MyCanvas *m_canvas;
+

     DECLARE_EVENT_TABLE()
 };
 
     DECLARE_EVENT_TABLE()
 };
 

+

 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------


@@ -86,8 +102,10 @@ private:
 enum
 {
     // menu items
 enum
 {
     // menu items

-    Minimal_Quit = 1,
-    Minimal_About
+    Erase_Menu_UseBuffer = 100,
+    Erase_Menu_EraseBg,
+    Erase_Menu_Exit = wxID_EXIT,
+    Erase_Menu_About = wxID_ABOUT

 };
 
 
 };
 
 


@@ -99,12 +117,14 @@ IMPLEMENT_APP(MyApp)
 
 bool MyApp::OnInit()
 {
 
 bool MyApp::OnInit()
 {

-    MyFrame *frame = new MyFrame("Minimal wxWindows App",
-                                 wxPoint(50, 50), wxSize(450, 340));
+    if ( !wxApp::OnInit() )
+        return false;
+
+    MyFrame *frame = new MyFrame;

 
 

-    frame->Show(TRUE);
-    
-    return TRUE;
+    frame->Show(true);
+
+    return true;

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -112,98 +132,167 @@ bool MyApp::OnInit()
 // ----------------------------------------------------------------------------
 
 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 // ----------------------------------------------------------------------------
 
 BEGIN_EVENT_TABLE(MyFrame, wxFrame)

-    EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
-    EVT_MENU(Minimal_About, MyFrame::OnAbout)
+    EVT_MENU(Erase_Menu_UseBuffer,  MyFrame::OnUseBuffer)
+    EVT_MENU(Erase_Menu_EraseBg,  MyFrame::OnEraseBg)
+    EVT_MENU(Erase_Menu_Exit,  MyFrame::OnQuit)
+    EVT_MENU(Erase_Menu_About, MyFrame::OnAbout)

 END_EVENT_TABLE()
 
 // frame constructor
 END_EVENT_TABLE()
 
 // frame constructor

-MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
-       : wxFrame((wxFrame *)NULL, -1, title, pos, size)
+MyFrame::MyFrame()
+       : wxFrame(NULL, wxID_ANY, _T("Erase sample"),
+                 wxPoint(50, 50), wxSize(450, 340))

 {
 {

-#ifdef __WXMAC__
-    wxApp::s_macAboutMenuItemId = Minimal_About;
-#endif
-

     SetIcon(wxICON(mondrian));
 
     SetIcon(wxICON(mondrian));
 

-    wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF);
+    wxMenu *menuFile = new wxMenu(_T(""), wxMENU_TEAROFF);
+    menuFile->AppendCheckItem(Erase_Menu_UseBuffer, _T("&Use memory DC\tCtrl-M"));
+    menuFile->AppendCheckItem(Erase_Menu_EraseBg, _T("Custom &background\tCtrl-B"));
+    menuFile->AppendSeparator();
+    menuFile->Append(Erase_Menu_Exit, _T("E&xit\tAlt-X"), _T("Quit this program"));

 
 

-    wxMenu *helpMenu = new wxMenu;
-    helpMenu->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");

 
 

-    menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
+    wxMenu *helpMenu = new wxMenu;
+    helpMenu->Append(Erase_Menu_About, _T("&About...\tCtrl-A"), _T("Show about dialog"));

 
     wxMenuBar *menuBar = new wxMenuBar();
 
     wxMenuBar *menuBar = new wxMenuBar();

-    menuBar->Append(menuFile, "&File");
-    menuBar->Append(helpMenu, "&Help");
+    menuBar->Append(menuFile, _T("&File"));
+    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);
 
     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 wxWidgets erase sample!"));

 #endif // wxUSE_STATUSBAR
 
 #endif // wxUSE_STATUSBAR
 

-    (void)new MyCanvas( this );
+    m_canvas = new MyCanvas( this );
+}
+
+
+void MyFrame::OnUseBuffer(wxCommandEvent& event)
+{
+    m_canvas->UseBuffer(event.IsChecked());

 }
 
 }
 

+void MyFrame::OnEraseBg(wxCommandEvent& event)
+{
+    m_canvas->EraseBg(event.IsChecked());
+}

 
 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 {
 
 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 {

-    Close(TRUE);
+    Close(true);

 }
 
 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 {
 }
 
 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 {

-    wxString msg;
-    msg.Printf( _T("This is the about dialog of the Erase sample.\n")
-                _T("Welcome to %s"), wxVERSION_STRING);
-
-    wxMessageBox(msg, "About Erase", wxOK | wxICON_INFORMATION, this);
+    wxMessageBox(_T("This sample shows how you can draw custom background."),
+                 _T("About Erase Sample"), wxOK | wxICON_INFORMATION, this);

 }
 
 
 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
     EVT_PAINT(  MyCanvas::OnPaint)
 }
 
 
 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
     EVT_PAINT(  MyCanvas::OnPaint)

+    EVT_CHAR(  MyCanvas::OnChar)

     EVT_ERASE_BACKGROUND(  MyCanvas::OnEraseBackground)
 END_EVENT_TABLE()
 
     EVT_ERASE_BACKGROUND(  MyCanvas::OnEraseBackground)
 END_EVENT_TABLE()
 

-MyCanvas::MyCanvas( MyFrame *parent )
- : wxScrolledWindow( parent, -1, wxDefaultPosition, wxDefaultSize, 
-                    wxScrolledWindowStyle|wxNO_FULL_REPAINT_ON_RESIZE|wxSUNKEN_BORDER )
+MyCanvas::MyCanvas( wxFrame *parent )
+        : wxScrolledWindow( parent, wxID_ANY, wxDefaultPosition, wxDefaultSize,
+                            wxScrolledWindowStyle | wxSUNKEN_BORDER )

 {
 {

+    m_eraseBg =
+    m_useBuffer = false;
+

     SetScrollbars( 10, 10, 40, 100, 0, 0 );
     SetScrollbars( 10, 10, 40, 100, 0, 0 );

+
+    m_bitmap = wxBitmap( wxICON(mondrian) );
+
+    new wxStaticBitmap( this, wxID_ANY, m_bitmap, wxPoint(80,20) );
+
+    SetFocusIgnoringChildren();

 }
 
 }
 

-void MyCanvas::OnPaint( wxPaintEvent &event )
+void MyCanvas::OnChar( wxKeyEvent &event )

 {
 {

-    wxPaintDC dc(this);
-    PrepareDC( dc );
-        
+#if wxUSE_UNICODE
+    if (event.m_uniChar)
+    {
+        m_text += event.m_uniChar;
+        Refresh();
+        return;
+    }
+#endif
+
+    // some test cases
+    switch (event.m_keyCode)
+    {
+        case WXK_UP: m_text += wxT( "<UP>" ); break;
+        case WXK_LEFT: m_text += wxT( "<LEFT>" ); break;
+        case WXK_RIGHT: m_text += wxT( "<RIGHT>" ); break;
+        case WXK_DOWN: m_text += wxT( "<DOWN>" ); break;
+        case WXK_RETURN: m_text += wxT( "<ENTER>" ); break;
+        default: m_text += (wxChar)event.m_keyCode; break;
+    }
+}
+
+void MyCanvas::DoPaint(wxDC& dc)
+{
+    dc.SetBrush( *wxBLACK_BRUSH );
+    dc.DrawRectangle( 10,10,200,50 );
+
+    dc.DrawBitmap( m_bitmap, 10, 20, true );
+
+    dc.SetTextForeground(*wxBLUE);
+    dc.DrawText(_T("This text is drawn from OnPaint"), 65, 65);
+
+    wxString tmp;
+    tmp.Printf( _T("Hit any key to display more text: %s"), m_text.c_str() );
+    int w,h;
+    dc.GetTextExtent( tmp, &w, &h );
+    dc.SetBrush( *wxWHITE_BRUSH );
+    dc.DrawRectangle( 65, 85, w, h );
+    dc.DrawText( tmp, 65, 85 );
+
+#if 0

     wxRegionIterator upd( GetUpdateRegion() );
     while (upd)
     {
     wxRegionIterator upd( GetUpdateRegion() );
     while (upd)
     {

-        wxLogDebug( "Paint: %d %d %d %d", upd.GetX(), upd.GetY(), upd.GetWidth(), upd.GetHeight() );
+        wxLogDebug( _T("Paint: %d %d %d %d"), upd.GetX(), upd.GetY(), upd.GetWidth(), upd.GetHeight() );

         upd ++;
     }
         upd ++;
     }

-    
+#endif
+
+#if 0
+    wxSize size = GetSize();
+    wxSize client_size = GetClientSize();
+    wxLogDebug( _T("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 );
     dc.SetPen( *wxWHITE_PEN );

-    for (int i = 0; i < 20; i += 2)
+    for (i = 0; i < 20; i += 2)

        dc.DrawLine( i,i, i+100,i );
        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 );
     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.SetBrush( *wxRED_BRUSH );
     dc.DrawRectangle( 100, 100, 200, 200 );

-    
+

     dc.DestroyClippingRegion();
 
     dc.SetPen( *wxTRANSPARENT_PEN );
     dc.DestroyClippingRegion();
 
     dc.SetPen( *wxTRANSPARENT_PEN );

-    
+

     wxRegion strip( 110, 200, 30, 1 );
     wxRegionIterator it( strip );
     while (it)
     wxRegion strip( 110, 200, 30, 1 );
     wxRegionIterator it( strip );
     while (it)


@@ -211,10 +300,61 @@ void MyCanvas::OnPaint( wxPaintEvent &event )
         dc.DrawRectangle( it.GetX(), it.GetY(), it.GetWidth(), it.GetHeight() );
         it ++;
     }
         dc.DrawRectangle( it.GetX(), it.GetY(), it.GetWidth(), it.GetHeight() );
         it ++;
     }

+#endif // 0
+}
+
+void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
+{
+    wxPaintDC dcWin(this);
+    PrepareDC( dcWin );
+
+    if ( m_useBuffer )
+    {
+        const wxSize size = GetClientSize();
+        wxMemoryDC dc;
+        wxBitmap bmp(size.x, size.y);
+        dc.SelectObject(bmp);
+        dc.Blit(0, 0, size.x, size.y, &dcWin, 0, 0);
+        dc.DrawText(_T("(copy of background)"), 5, 120 );
+
+        DoPaint(dc);
+
+        dcWin.Blit(0, 0, size.x, size.y, &dc, 0, 0);
+    }
+    else
+    {
+        DoPaint(dcWin);
+    }

 }
 
 }
 

-void MyCanvas::OnEraseBackground( wxEraseEvent &event )
+void MyCanvas::OnEraseBackground( wxEraseEvent& event )

 {
 {

-    event.Skip( TRUE );
+    if ( !m_eraseBg )
+    {
+        event.Skip();
+        return;
+    }
+
+    wxDC& dc = *event.GetDC();
+    dc.SetPen(*wxGREEN_PEN);
+
+    PrepareDC( dc );
+
+    // clear any junk currently displayed
+    dc.Clear();
+
+    const wxSize size = GetClientSize();
+    for ( int x = 0; x < size.x; x += 15 )
+    {
+        dc.DrawLine(x, 0, x, size.y);
+    }
+
+    for ( int y = 0; y < size.y; y += 15 )
+    {
+        dc.DrawLine(0, y, size.x, y);
+    }
+
+    dc.SetTextForeground(*wxRED);
+    dc.DrawText(_T("This text is drawn from OnEraseBackground"), 60, 160);

 }
 
 }