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   SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
  54 }
  55
  56 wxWindowDC::~wxWindowDC(void)
  57 {
  58   if (m_canvas && m_hDC)
  59   {
  60     SelectOldObjects(m_hDC);
  61
  62     ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
  63         m_hDC = 0;
  64   }
  65   m_hDCCount --;
  66 }
  67
  68 /*
  69  * wxClientDC
  70  */
  71
  72 wxClientDC::wxClientDC(void)
  73 {
  74   m_canvas = NULL;
  75 }
  76
  77 wxClientDC::wxClientDC(wxWindow *the_canvas)
  78 {
  79   m_canvas = the_canvas;
  80 //  BeginDrawing();
  81   m_hDC = (WXHDC) ::GetDC((HWND) the_canvas->GetHWND());
  82
  83   SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
  84 }
  85
  86 wxClientDC::~wxClientDC(void)
  87 {
  88 //  EndDrawing();
  89
  90   if (m_canvas && (HDC) m_hDC)
  91   {
  92     SelectOldObjects(m_hDC);
  93
  94     ::ReleaseDC((HWND) m_canvas->GetHWND(), (HDC) m_hDC);
  95         m_hDC = 0;
  96   }
  97 }
  98
  99 /*
 100  * wxPaintDC
 101  */
 102
 103 wxPaintDC::wxPaintDC(void)
 104 {
 105   m_canvas = NULL;
 106 }
 107
 108 static PAINTSTRUCT g_paintStruct;
 109
 110 // Don't call Begin/EndPaint if it's already been called:
 111 // for example, if calling a base class OnPaint.
 112
 113 WXHDC  wxPaintDC::ms_PaintHDC = 0;
 114 size_t wxPaintDC::ms_PaintCount = 0; // count of ms_PaintHDC usage
 115
 116 wxPaintDC::wxPaintDC(wxWindow *canvas)
 117 {
 118   wxCHECK_RET( canvas, "NULL canvas in wxPaintDC ctor" );
 119
 120   m_canvas = canvas;
 121   if ( ms_PaintCount > 0 ) {
 122     // it means that we've already called BeginPaint and so we must just
 123     // reuse the same HDC (BeginPaint shouldn't be called more than once)
 124     wxASSERT( ms_PaintHDC );
 125
 126     m_hDC = ms_PaintHDC;
 127     ms_PaintCount++;
 128   }
 129   else {
 130     ms_PaintHDC =
 131     m_hDC = (WXHDC)::BeginPaint((HWND)m_canvas->GetHWND(), &g_paintStruct);
 132     ms_PaintCount = 1;
 133     m_hDCCount++;
 134   }
 135
 136   SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
 137 }
 138
 139 wxPaintDC::~wxPaintDC()
 140 {
 141   if ( m_hDC ) {
 142     if ( !--ms_PaintCount ) {
 143       ::EndPaint((HWND)m_canvas->GetHWND(), &g_paintStruct);
 144       m_hDCCount--;
 145       m_hDC = (WXHDC) NULL;
 146       ms_PaintHDC = (WXHDC) NULL;
 147     }
 148     else { }//: ms_PaintHDC still in use
 149   }
 150 }
 151