include/wx/msw/private/dc.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/private/dc.h
   3 // Purpose:     private wxMSW helpers for working with HDCs
   4 // Author:      Vadim Zeitlin
   5 // Created:     2009-06-16 (extracted from src/msw/dc.cpp)
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2009 Vadim Zeitlin <vadim@wxwidgets.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _MSW_PRIVATE_DC_H_
  12 #define _MSW_PRIVATE_DC_H_
  13
  14 #include "wx/msw/dc.h"
  15 #include "wx/msw/wrapwin.h"
  16
  17 namespace wxMSWImpl
  18 {
  19
  20 // various classes to change some DC property temporarily
  21
  22 // text background and foreground colours
  23 class wxTextColoursChanger
  24 {
  25 public:
  26     wxTextColoursChanger(HDC hdc, const wxMSWDCImpl& dc)
  27         : m_hdc(hdc)
  28     {
  29         Change(dc.GetTextForeground(), dc.GetTextBackground());
  30     }
  31
  32     wxTextColoursChanger(HDC hdc, const wxColour& colFg, const wxColour& colBg)
  33         : m_hdc(hdc)
  34     {
  35         Change(colFg, colBg);
  36     }
  37
  38     wxTextColoursChanger(HDC hdc, COLORREF colFg, COLORREF colBg)
  39         : m_hdc(hdc)
  40     {
  41         Change(colFg, colBg);
  42     }
  43
  44     ~wxTextColoursChanger()
  45     {
  46         if ( m_oldColFg != CLR_INVALID )
  47             ::SetTextColor(m_hdc, m_oldColFg);
  48         if ( m_oldColBg != CLR_INVALID )
  49             ::SetBkColor(m_hdc, m_oldColBg);
  50     }
  51
  52 protected:
  53     // this ctor doesn't change mode immediately, call Change() later to do it
  54     // only if needed
  55     wxTextColoursChanger(HDC hdc)
  56         : m_hdc(hdc)
  57     {
  58         m_oldColFg =
  59         m_oldColBg = CLR_INVALID;
  60     }
  61
  62     void Change(const wxColour& colFg, const wxColour& colBg)
  63     {
  64         Change(colFg.IsOk() ? colFg.GetPixel() : CLR_INVALID,
  65                colBg.IsOk() ? colBg.GetPixel() : CLR_INVALID);
  66     }
  67
  68     void Change(COLORREF colFg, COLORREF colBg)
  69     {
  70         if ( colFg != CLR_INVALID )
  71         {
  72             m_oldColFg = ::SetTextColor(m_hdc, colFg);
  73             if ( m_oldColFg == CLR_INVALID )
  74             {
  75                 wxLogLastError(wxT("SetTextColor"));
  76             }
  77         }
  78         else
  79         {
  80             m_oldColFg = CLR_INVALID;
  81         }
  82
  83         if ( colBg != CLR_INVALID )
  84         {
  85             m_oldColBg = ::SetBkColor(m_hdc, colBg);
  86             if ( m_oldColBg == CLR_INVALID )
  87             {
  88                 wxLogLastError(wxT("SetBkColor"));
  89             }
  90         }
  91         else
  92         {
  93             m_oldColBg = CLR_INVALID;
  94         }
  95     }
  96
  97 private:
  98     const HDC m_hdc;
  99     COLORREF m_oldColFg,
 100              m_oldColBg;
 101
 102     wxDECLARE_NO_COPY_CLASS(wxTextColoursChanger);
 103 };
 104
 105 // background mode
 106 class wxBkModeChanger
 107 {
 108 public:
 109     // set background mode to opaque if mode != wxBRUSHSTYLE_TRANSPARENT
 110     wxBkModeChanger(HDC hdc, int mode)
 111         : m_hdc(hdc)
 112     {
 113         Change(mode);
 114     }
 115
 116     ~wxBkModeChanger()
 117     {
 118         if ( m_oldMode )
 119             ::SetBkMode(m_hdc, m_oldMode);
 120     }
 121
 122 protected:
 123     // this ctor doesn't change mode immediately, call Change() later to do it
 124     // only if needed
 125     wxBkModeChanger(HDC hdc) : m_hdc(hdc) { m_oldMode = 0; }
 126
 127     void Change(int mode)
 128     {
 129         m_oldMode = ::SetBkMode(m_hdc, mode == wxBRUSHSTYLE_TRANSPARENT
 130                                         ? TRANSPARENT
 131                                         : OPAQUE);
 132         if ( !m_oldMode )
 133         {
 134             wxLogLastError(wxT("SetBkMode"));
 135         }
 136     }
 137
 138 private:
 139     const HDC m_hdc;
 140     int m_oldMode;
 141
 142     wxDECLARE_NO_COPY_CLASS(wxBkModeChanger);
 143 };
 144
 145 } // namespace wxMSWImpl
 146
 147 #endif // _MSW_PRIVATE_DC_H_
 148