src/msw/dcclient.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dcclient.cpp
   3 // Purpose:     wxClientDC class
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "dcclient.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24 #endif
  25
  26 #include "wx/dcclient.h"
  27 #include "wx/log.h"
  28
  29 #include <windows.h>
  30
  31 #if !USE_SHARED_LIBRARY
  32 IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxDC)
  33 IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)
  34 IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxDC)
  35 #endif
  36
  37 wxClientDC::wxClientDC(void)
  38 {
  39   m_canvas = NULL;
  40 }
  41
  42 wxClientDC::wxClientDC(wxWindow *the_canvas)
  43 {
  44   m_canvas = the_canvas;
  45 //  BeginDrawing();
  46   m_hDC = (WXHDC) ::GetDC((HWND) the_canvas->GetHWND());
  47 }
  48
  49 wxClientDC::~wxClientDC(void)
  50 {
  51 //  EndDrawing();
  52
  53   if (m_canvas && (HDC) m_hDC)
  54   {
  55     SelectOldObjects(m_hDC);
  56
  57     ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
  58         m_hDC = 0;
  59   }
  60 }
  61
  62 wxWindowDC::wxWindowDC(void)
  63 {
  64   m_canvas = NULL;
  65 }
  66
  67 wxWindowDC::wxWindowDC(wxWindow *the_canvas)
  68 {
  69   m_canvas = the_canvas;
  70 //  m_hDC = (WXHDC) ::GetDCEx((HWND) the_canvas->GetHWND(), NULL, DCX_WINDOW);
  71   m_hDC = (WXHDC) ::GetWindowDC((HWND) the_canvas->GetHWND() );
  72   m_hDCCount ++;
  73 }
  74
  75 wxWindowDC::~wxWindowDC(void)
  76 {
  77   if (m_canvas && m_hDC)
  78   {
  79     SelectOldObjects(m_hDC);
  80
  81     ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
  82         m_hDC = 0;
  83   }
  84   m_hDCCount --;
  85 }
  86
  87 wxPaintDC::wxPaintDC(void)
  88 {
  89   m_canvas = NULL;
  90 }
  91
  92 static PAINTSTRUCT g_paintStruct;
  93
  94 // Don't call Begin/EndPaint if it's already been called:
  95 // for example, if calling a base class OnPaint.
  96
  97 WXHDC  wxPaintDC::ms_PaintHDC = 0;
  98 size_t wxPaintDC::ms_PaintCount = 0; // count of ms_PaintHDC usage
  99
 100 wxPaintDC::wxPaintDC(wxWindow *canvas)
 101 {
 102   wxCHECK_RET( canvas, "NULL canvas in wxPaintDC ctor" );
 103
 104   m_canvas = canvas;
 105   if ( ms_PaintCount > 0 ) {
 106     // it means that we've already called BeginPaint and so we must just
 107     // reuse the same HDC (BeginPaint shouldn't be called more than once)
 108     wxASSERT( ms_PaintHDC );
 109
 110     m_hDC = ms_PaintHDC;
 111     ms_PaintCount++;
 112   }
 113   else {
 114     ms_PaintHDC =
 115     m_hDC = (WXHDC)::BeginPaint((HWND)m_canvas->GetHWND(), &g_paintStruct);
 116     ms_PaintCount = 1;
 117     m_hDCCount++;
 118   }
 119 }
 120
 121 wxPaintDC::~wxPaintDC()
 122 {
 123   if ( m_hDC ) {
 124     if ( !--ms_PaintCount ) {
 125       ::EndPaint((HWND)m_canvas->GetHWND(), &g_paintStruct);
 126       m_hDCCount--;
 127       m_hDC = NULL;
 128       ms_PaintHDC = NULL;
 129     }
 130     else { }//: ms_PaintHDC still in use
 131   }
 132 }
 133