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(wxWindowDC, wxDC)
  33 IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxWindowDC)
  34 IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxWindowDC)
  35 #endif
  36
  37 /*
  38  * wxWindowDC
  39  */
  40
  41 wxWindowDC::wxWindowDC(void)
  42 {
  43   m_canvas = NULL;
  44 }
  45
  46 wxWindowDC::wxWindowDC(wxWindow *the_canvas)
  47 {
  48   m_canvas = the_canvas;
  49 //  m_hDC = (WXHDC) ::GetDCEx((HWND) the_canvas->GetHWND(), NULL, DCX_WINDOW);
  50   m_hDC = (WXHDC) ::GetWindowDC((HWND) the_canvas->GetHWND() );
  51   m_hDCCount ++;
  52 }
  53
  54 wxWindowDC::~wxWindowDC(void)
  55 {
  56   if (m_canvas && m_hDC)
  57   {
  58     SelectOldObjects(m_hDC);
  59
  60     ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
  61         m_hDC = 0;
  62   }
  63   m_hDCCount --;
  64 }
  65
  66 /*
  67  * wxClientDC
  68  */
  69
  70 wxClientDC::wxClientDC(void)
  71 {
  72   m_canvas = NULL;
  73 }
  74
  75 wxClientDC::wxClientDC(wxWindow *the_canvas)
  76 {
  77   m_canvas = the_canvas;
  78 //  BeginDrawing();
  79   m_hDC = (WXHDC) ::GetDC((HWND) the_canvas->GetHWND());
  80 }
  81
  82 wxClientDC::~wxClientDC(void)
  83 {
  84 //  EndDrawing();
  85
  86   if (m_canvas && (HDC) m_hDC)
  87   {
  88     SelectOldObjects(m_hDC);
  89
  90     ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
  91         m_hDC = 0;
  92   }
  93 }
  94
  95 /*
  96  * wxPaintDC
  97  */
  98
  99 wxPaintDC::wxPaintDC(void)
 100 {
 101   m_canvas = NULL;
 102 }
 103
 104 static PAINTSTRUCT g_paintStruct;
 105
 106 // Don't call Begin/EndPaint if it's already been called:
 107 // for example, if calling a base class OnPaint.
 108
 109 WXHDC  wxPaintDC::ms_PaintHDC = 0;
 110 size_t wxPaintDC::ms_PaintCount = 0; // count of ms_PaintHDC usage
 111
 112 wxPaintDC::wxPaintDC(wxWindow *canvas)
 113 {
 114   wxCHECK_RET( canvas, "NULL canvas in wxPaintDC ctor" );
 115
 116   m_canvas = canvas;
 117   if ( ms_PaintCount > 0 ) {
 118     // it means that we've already called BeginPaint and so we must just
 119     // reuse the same HDC (BeginPaint shouldn't be called more than once)
 120     wxASSERT( ms_PaintHDC );
 121
 122     m_hDC = ms_PaintHDC;
 123     ms_PaintCount++;
 124   }
 125   else {
 126     ms_PaintHDC =
 127     m_hDC = (WXHDC)::BeginPaint((HWND)m_canvas->GetHWND(), &g_paintStruct);
 128     ms_PaintCount = 1;
 129     m_hDCCount++;
 130   }
 131 }
 132
 133 wxPaintDC::~wxPaintDC()
 134 {
 135   if ( m_hDC ) {
 136     if ( !--ms_PaintCount ) {
 137       ::EndPaint((HWND)m_canvas->GetHWND(), &g_paintStruct);
 138       m_hDCCount--;
 139       m_hDC = (WXHDC) NULL;
 140       ms_PaintHDC = (WXHDC) NULL;
 141     }
 142     else { }//: ms_PaintHDC still in use
 143   }
 144 }
 145