src/msw/ownerdrw.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/ownerdrw.cpp
   3 // Purpose:     implementation of wxOwnerDrawn class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     13.11.97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation
  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   #include "wx/font.h"
  25   #include "wx/bitmap.h"
  26   #include "wx/dcmemory.h"
  27   #include "wx/menu.h"
  28   #include "wx/utils.h"
  29 #endif
  30
  31 #include "wx/ownerdrw.h"
  32 #include "wx/menuitem.h"
  33
  34 #include "wx/msw/private.h"
  35
  36 // ============================================================================
  37 // implementation of wxOwnerDrawn class
  38 // ============================================================================
  39
  40 // ctor
  41 // ----
  42 wxOwnerDrawn::wxOwnerDrawn(const wxString& str,
  43                            bool bCheckable, bool bMenuItem)
  44             : m_strName(str)
  45 {
  46   m_bCheckable   = bCheckable;
  47   m_bOwnerDrawn  = FALSE;
  48   m_nHeight      = 0;
  49   m_nMarginWidth = ms_nLastMarginWidth;
  50 }
  51
  52 #if defined(__WXMSW__) && defined(__WIN32__) && defined(SM_CXMENUCHECK)
  53   size_t wxOwnerDrawn::ms_nDefaultMarginWidth = GetSystemMetrics(SM_CXMENUCHECK);
  54 #else   // # what is the reasonable default?
  55   size_t wxOwnerDrawn::ms_nDefaultMarginWidth = 15;
  56 #endif
  57
  58 size_t wxOwnerDrawn::ms_nLastMarginWidth = ms_nDefaultMarginWidth;
  59
  60 // drawing
  61 // -------
  62
  63 // get size of the item
  64 bool wxOwnerDrawn::OnMeasureItem(size_t *pwidth, size_t *pheight)
  65 {
  66   wxMemoryDC dc;
  67   dc.SetFont(GetFont());
  68
  69   // ## ugly...
  70   char *szStripped = new char[m_strName.Len()];
  71   wxStripMenuCodes((char *)m_strName.c_str(), szStripped);
  72   wxString str = szStripped;
  73   delete [] szStripped;
  74
  75   // # without this menu items look too tightly packed (at least under Windows)
  76   str += 'W'; // 'W' is typically the widest letter
  77
  78   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
  79   m_nHeight = *pheight;                // remember height for use in OnDrawItem
  80
  81   return TRUE;
  82 }
  83
  84 // searching for this macro you'll find all the code where I'm using the native
  85 // Win32 GDI functions and not wxWindows ones. Might help to whoever decides to
  86 // port this code to X. (VZ)
  87
  88 #if defined(__WIN32__) && !defined(__SC__) && !defined(__TWIN32__)
  89 #define   O_DRAW_NATIVE_API     // comments below explain why I use it
  90 #endif
  91
  92 // draw the item
  93 bool wxOwnerDrawn::OnDrawItem(wxDC& dc, const wxRect& rc, wxODAction act, wxODStatus st)
  94 {
  95   // we do nothing on focus change
  96   if ( act == wxODFocusChanged )
  97     return TRUE;
  98
  99   // wxColor <-> RGB
 100   #define   ToRGB(col)  RGB(col.Red(), col.Green(), col.Blue())
 101   #define   UnRGB(col)  GetRValue(col), GetGValue(col), GetBValue(col)
 102
 103   // set the colors
 104   // --------------
 105   DWORD colBack, colText;
 106   if ( st & wxODSelected ) {
 107     colBack = GetSysColor(COLOR_HIGHLIGHT);
 108     colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 109   }
 110   else {
 111     // fall back to default colors if none explicitly specified
 112     colBack = m_colBack.Ok() ? ToRGB(m_colBack) : GetSysColor(COLOR_WINDOW);
 113     colText = m_colText.Ok() ? ToRGB(m_colText) : GetSysColor(COLOR_WINDOWTEXT);
 114   }
 115
 116   #ifdef  O_DRAW_NATIVE_API
 117     #define  hdc           (HDC)dc.GetHDC()
 118     COLORREF colOldText = ::SetTextColor(hdc, colText),
 119              colOldBack = ::SetBkColor(hdc, colBack);
 120   #else
 121     dc.SetTextForeground(wxColor(UnRGB(colText)));
 122     dc.SetTextBackground(wxColor(UnRGB(colBack)));
 123   #endif
 124
 125   // select the font and draw the text
 126   // ---------------------------------
 127
 128   // determine where to draw and leave space for a check-mark.
 129   int x = rc.x + GetMarginWidth();
 130
 131   // using native API because it reckognizes '&'
 132   #ifdef  O_DRAW_NATIVE_API
 133     int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 134     HBRUSH  hbr = CreateSolidBrush(colBack),
 135             hPrevBrush = (HBRUSH) SelectObject(hdc, hbr);
 136
 137     RECT rectAll = { rc.GetLeft(), rc.GetTop(), rc.GetRight(), rc.GetBottom() };
 138     FillRect(hdc, &rectAll, hbr);
 139
 140     // use default font if no font set
 141     HFONT hfont;
 142     if ( m_font.Ok() ) {
 143       m_font.RealizeResource();
 144       hfont = (HFONT)m_font.GetResourceHandle();
 145     }
 146     else {
 147       hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 148     }
 149
 150     HFONT hPrevFont = (HFONT) ::SelectObject(hdc, hfont);
 151     DrawState(hdc, NULL, NULL,
 152               (LPARAM)(const char *)m_strName, m_strName.Length(),
 153               x, rc.y, rc.GetWidth(), rc.GetHeight(),
 154               DST_PREFIXTEXT | ( st & wxODDisabled ? DSS_DISABLED : 0) );
 155
 156     (void)SelectObject(hdc, hPrevBrush);
 157     (void)SelectObject(hdc, hPrevFont);
 158     (void)SetBkMode(hdc, nPrevMode);
 159   #else
 160     dc.SetFont(GetFont());
 161     dc.DrawText(m_strName, x, rc.y);
 162   #endif  //O_DRAW_NATIVE_API
 163
 164   // draw the bitmap
 165   // ---------------
 166   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 167     if ( st & wxODChecked ) {
 168       // using native APIs for performance and simplicity
 169 #ifdef  O_DRAW_NATIVE_API
 170       // what goes on: DrawFrameControl creates a b/w mask,
 171       // then we copy it to screen to have right colors
 172
 173         // first create a monochrome bitmap in a memory DC
 174       HDC hdcMem = CreateCompatibleDC(hdc);
 175       HBITMAP hbmpCheck = CreateBitmap(GetMarginWidth(), m_nHeight, 1, 1, 0);
 176       SelectObject(hdcMem, hbmpCheck);
 177
 178         // then draw a check mark into it
 179       RECT rect = { 0, 0, GetMarginWidth(), m_nHeight };
 180 #ifndef __SC__
 181       DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 182 #endif
 183
 184         // finally copy it to screen DC and clean up
 185       BitBlt(hdc, rc.x, rc.y, GetMarginWidth(), m_nHeight,
 186              hdcMem, 0, 0, SRCCOPY);
 187       DeleteDC(hdcMem);
 188 #else
 189         // #### to do: perhaps using Marlett font (create equiv. font under X)
 190 //        wxFAIL("not implemented");
 191 #endif  //O_DRAW_NATIVE_API
 192     }
 193   }
 194   else {
 195     // for uncheckable item we use only the 'checked' bitmap
 196     wxBitmap bmp(GetBitmap(IsCheckable() ? ((st & wxODChecked) != 0) : TRUE));
 197     if ( bmp.Ok() ) {
 198       wxMemoryDC dcMem(&dc);
 199       dcMem.SelectObject(bmp);
 200
 201       // center bitmap
 202       int nBmpWidth = bmp.GetWidth(),
 203           nBmpHeight = bmp.GetHeight();
 204
 205       // there should be enough place!
 206       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 207
 208       dc.Blit(rc.x + (GetMarginWidth() - nBmpWidth) / 2,
 209               rc.y + (m_nHeight - nBmpHeight) /2,
 210               nBmpWidth, nBmpHeight,
 211               &dcMem, 0, 0, wxCOPY);
 212
 213       if ( st & wxODSelected ) {
 214         #ifdef  O_DRAW_NATIVE_API
 215           RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 216                            rc.GetLeft() + GetMarginWidth(),
 217                            rc.GetTop() + m_nHeight };
 218           SetBkColor(hdc, colBack);
 219           DrawEdge(hdc, &rectBmp, EDGE_RAISED, BF_SOFT | BF_RECT);
 220         #else
 221           // ## to write portable DrawEdge
 222         #endif  //O_DRAW_NATIVE_API
 223       }
 224     }
 225   }
 226
 227   #ifdef  O_DRAW_NATIVE_API
 228     ::SetTextColor(hdc, colOldText);
 229     ::SetBkColor(hdc, colOldBack);
 230
 231     #undef  hdc
 232   #endif  //O_DRAW_NATIVE_API
 233
 234   return TRUE;
 235 }
 236