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 #ifdef __GNUG__
  17 #pragma implementation
  18 #pragma implementation "dcclient.h"
  19 #endif
  20
  21 // For compilers that support precompilation, includes "wx.h".
  22 #include "wx/wxprec.h"
  23
  24 #ifdef __BORLANDC__
  25 #pragma hdrstop
  26 #endif
  27
  28 #ifndef WX_PRECOMP
  29 #endif
  30
  31 #include "wx/dcclient.h"
  32 #include "wx/log.h"
  33
  34 #include <windows.h>
  35
  36 #if !USE_SHARED_LIBRARY
  37 IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxDC)
  38 IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)
  39 IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxDC)
  40 #endif
  41
  42 wxClientDC::wxClientDC(void)
  43 {
  44   m_canvas = NULL;
  45 }
  46
  47 wxClientDC::wxClientDC(wxWindow *the_canvas)
  48 {
  49   m_canvas = the_canvas;
  50 //  BeginDrawing();
  51   m_hDC = (WXHDC) ::GetDC((HWND) the_canvas->GetHWND());
  52 }
  53
  54 wxClientDC::~wxClientDC(void)
  55 {
  56 //  EndDrawing();
  57
  58   if (m_canvas && (HDC) m_hDC)
  59   {
  60     SelectOldObjects(m_hDC);
  61
  62     ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
  63         m_hDC = 0;
  64   }
  65 }
  66
  67 wxWindowDC::wxWindowDC(void)
  68 {
  69   m_canvas = NULL;
  70 }
  71
  72 wxWindowDC::wxWindowDC(wxWindow *the_canvas)
  73 {
  74   m_canvas = the_canvas;
  75 //  m_hDC = (WXHDC) ::GetDCEx((HWND) the_canvas->GetHWND(), NULL, DCX_WINDOW);
  76   m_hDC = (WXHDC) ::GetWindowDC((HWND) the_canvas->GetHWND() );
  77   m_hDCCount ++;
  78 }
  79
  80 wxWindowDC::~wxWindowDC(void)
  81 {
  82   if (m_canvas && m_hDC)
  83   {
  84     SelectOldObjects(m_hDC);
  85
  86     ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
  87         m_hDC = 0;
  88   }
  89   m_hDCCount --;
  90 }
  91
  92 wxPaintDC::wxPaintDC(void)
  93 {
  94   m_canvas = NULL;
  95 }
  96
  97 static PAINTSTRUCT g_paintStruct;
  98
  99 // Don't call Begin/EndPaint if it's already been called:
 100 // for example, if calling a base class OnPaint.
 101
 102 WXHDC wxPaintDC::ms_PaintHDC = 0;
 103 uint  wxPaintDC::ms_PaintCount = 0; // count of ms_PaintHDC usage
 104
 105 wxPaintDC::wxPaintDC(wxWindow *canvas)
 106 {
 107   wxCHECK_RET( canvas, "NULL canvas in wxPaintDC ctor" );
 108
 109   m_canvas = canvas;
 110   if ( ms_PaintCount > 0 ) {
 111     // it means that we've already called BeginPaint and so we must just
 112     // reuse the same HDC (BeginPaint shouldn't be called more than once)
 113     wxASSERT( ms_PaintHDC );
 114
 115     m_hDC = ms_PaintHDC;
 116     ms_PaintCount++;
 117   }
 118   else {
 119     ms_PaintHDC =
 120     m_hDC = (WXHDC)::BeginPaint((HWND)m_canvas->GetHWND(), &g_paintStruct);
 121     ms_PaintCount = 1;
 122     m_hDCCount++;
 123   }
 124 }
 125
 126 wxPaintDC::~wxPaintDC()
 127 {
 128   if ( m_hDC ) {
 129     if ( !--ms_PaintCount ) {
 130       ::EndPaint((HWND)m_canvas->GetHWND(), &g_paintStruct);
 131       m_hDCCount--;
 132       m_hDC = NULL;
 133       ms_PaintHDC = NULL;
 134     }
 135     //else: ms_PaintHDC still in use
 136   }
 137 }
 138