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 <windows.h>
  35
  36 #ifdef DrawText
  37 #undef DrawText
  38 #endif
  39
  40 // ============================================================================
  41 // implementation of wxOwnerDrawn class
  42 // ============================================================================
  43
  44 // ctor
  45 // ----
  46 wxOwnerDrawn::wxOwnerDrawn(const wxString& str,
  47                            bool bCheckable, bool bMenuItem)
  48             : m_strName(str)
  49 {
  50   m_bCheckable   = bCheckable;
  51   m_bOwnerDrawn  = FALSE;
  52   m_nHeight      = 0;
  53   m_nMarginWidth = ms_nLastMarginWidth;
  54 }
  55
  56 #if defined(__WXMSW__) && defined(__WIN32__) && defined(SM_CXMENUCHECK)
  57   size_t wxOwnerDrawn::ms_nDefaultMarginWidth = GetSystemMetrics(SM_CXMENUCHECK);
  58 #else   // # what is the reasonable default?
  59   size_t wxOwnerDrawn::ms_nDefaultMarginWidth = 15;
  60 #endif
  61
  62 size_t wxOwnerDrawn::ms_nLastMarginWidth = ms_nDefaultMarginWidth;
  63
  64 // drawing
  65 // -------
  66
  67 // get size of the item
  68 bool wxOwnerDrawn::OnMeasureItem(size_t *pwidth, size_t *pheight)
  69 {
  70   wxMemoryDC dc;
  71   dc.SetFont(GetFont());
  72
  73   // ## ugly...
  74   char *szStripped = new char[m_strName.Len()];
  75   wxStripMenuCodes((char *)m_strName.c_str(), szStripped);
  76   wxString str = szStripped;
  77   delete [] szStripped;
  78
  79   // # without this menu items look too tightly packed (at least under Windows)
  80   str += 'W'; // 'W' is typically the widest letter
  81
  82   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
  83   m_nHeight = *pheight;                // remember height for use in OnDrawItem
  84
  85   return TRUE;
  86 }
  87
  88 // searching for this macro you'll find all the code where I'm using the native
  89 // Win32 GDI functions and not wxWindows ones. Might help to whoever decides to
  90 // port this code to X. (VZ)
  91
  92 #if defined(__WIN32__) && !defined(__SC__)
  93 #define   O_DRAW_NATIVE_API     // comments below explain why I use it
  94 #endif
  95
  96 // draw the item
  97 bool wxOwnerDrawn::OnDrawItem(wxDC& dc, const wxRect& rc, wxODAction act, wxODStatus st)
  98 {
  99   // we do nothing on focus change
 100   if ( act == wxODFocusChanged )
 101     return TRUE;
 102
 103   // wxColor <-> RGB
 104   #define   ToRGB(col)  RGB(col.Red(), col.Green(), col.Blue())
 105   #define   UnRGB(col)  GetRValue(col), GetGValue(col), GetBValue(col)
 106
 107   // set the colors
 108   // --------------
 109   DWORD colBack, colText;
 110   if ( st & wxODSelected ) {
 111     colBack = GetSysColor(COLOR_HIGHLIGHT);
 112     colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 113   }
 114   else {
 115     // fall back to default colors if none explicitly specified
 116     colBack = m_colBack.Ok() ? ToRGB(m_colBack) : GetSysColor(COLOR_WINDOW);
 117     colText = m_colText.Ok() ? ToRGB(m_colText) : GetSysColor(COLOR_WINDOWTEXT);
 118   }
 119
 120   #ifdef  O_DRAW_NATIVE_API
 121     #define  hdc           (HDC)dc.GetHDC()
 122     COLORREF colOldText = ::SetTextColor(hdc, colText),
 123              colOldBack = ::SetBkColor(hdc, colBack);
 124   #else
 125     dc.SetTextForeground(wxColor(UnRGB(colText)));
 126     dc.SetTextBackground(wxColor(UnRGB(colBack)));
 127   #endif
 128
 129   // select the font and draw the text
 130   // ---------------------------------
 131
 132   // determine where to draw and leave space for a check-mark.
 133   int x = rc.x + GetMarginWidth();
 134
 135   // using native API because it reckognizes '&'
 136   #ifdef  O_DRAW_NATIVE_API
 137     int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 138     HBRUSH  hbr = CreateSolidBrush(colBack),
 139             hPrevBrush = (HBRUSH) SelectObject(hdc, hbr);
 140
 141     RECT rectAll = { rc.GetLeft(), rc.GetTop(), rc.GetRight(), rc.GetBottom() };
 142     FillRect(hdc, &rectAll, hbr);
 143
 144     // use default font if no font set
 145     HFONT hfont;
 146     if ( m_font.Ok() ) {
 147       m_font.RealizeResource();
 148       hfont = (HFONT)m_font.GetResourceHandle();
 149     }
 150     else {
 151       hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 152     }
 153
 154     HFONT hPrevFont = (HFONT) ::SelectObject(hdc, hfont);
 155     DrawState(hdc, NULL, NULL,
 156               (LPARAM)(const char *)m_strName, m_strName.Length(),
 157               x, rc.y, rc.GetWidth(), rc.GetHeight(),
 158               DST_PREFIXTEXT | ( st & wxODDisabled ? DSS_DISABLED : 0) );
 159
 160     (void)SelectObject(hdc, hPrevBrush);
 161     (void)SelectObject(hdc, hPrevFont);
 162     (void)SetBkMode(hdc, nPrevMode);
 163   #else
 164     dc.SetFont(GetFont());
 165     dc.DrawText(m_strName, x, rc.y);
 166   #endif  //O_DRAW_NATIVE_API
 167
 168   // draw the bitmap
 169   // ---------------
 170   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 171     if ( st & wxODChecked ) {
 172       // using native APIs for performance and simplicity
 173 #ifdef  O_DRAW_NATIVE_API
 174       // what goes on: DrawFrameControl creates a b/w mask,
 175       // then we copy it to screen to have right colors
 176
 177         // first create a monochrome bitmap in a memory DC
 178       HDC hdcMem = CreateCompatibleDC(hdc);
 179       HBITMAP hbmpCheck = CreateBitmap(GetMarginWidth(), m_nHeight, 1, 1, 0);
 180       SelectObject(hdcMem, hbmpCheck);
 181
 182         // then draw a check mark into it
 183       RECT rect = { 0, 0, GetMarginWidth(), m_nHeight };
 184 #ifndef __SC__
 185       DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 186 #endif
 187
 188         // finally copy it to screen DC and clean up
 189       BitBlt(hdc, rc.x, rc.y, GetMarginWidth(), m_nHeight,
 190              hdcMem, 0, 0, SRCCOPY);
 191       DeleteDC(hdcMem);
 192 #else
 193         // #### to do: perhaps using Marlett font (create equiv. font under X)
 194 //        wxFAIL("not implemented");
 195 #endif  //O_DRAW_NATIVE_API
 196     }
 197   }
 198   else {
 199     // for uncheckable item we use only the 'checked' bitmap
 200     wxBitmap bmp(GetBitmap(IsCheckable() ? ((st & wxODChecked) != 0) : TRUE));
 201     if ( bmp.Ok() ) {
 202       wxMemoryDC dcMem(&dc);
 203       dcMem.SelectObject(bmp);
 204
 205       // center bitmap
 206       int nBmpWidth = bmp.GetWidth(),
 207           nBmpHeight = bmp.GetHeight();
 208
 209       // there should be enough place!
 210       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 211
 212       dc.Blit(rc.x + (GetMarginWidth() - nBmpWidth) / 2,
 213               rc.y + (m_nHeight - nBmpHeight) /2,
 214               nBmpWidth, nBmpHeight,
 215               &dcMem, 0, 0, wxCOPY);
 216
 217       if ( st & wxODSelected ) {
 218         #ifdef  O_DRAW_NATIVE_API
 219           RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 220                            rc.GetLeft() + GetMarginWidth(),
 221                            rc.GetTop() + m_nHeight };
 222           SetBkColor(hdc, colBack);
 223           DrawEdge(hdc, &rectBmp, EDGE_RAISED, BF_SOFT | BF_RECT);
 224         #else
 225           // ## to write portable DrawEdge
 226         #endif  //O_DRAW_NATIVE_API
 227       }
 228     }
 229   }
 230
 231   #ifdef  O_DRAW_NATIVE_API
 232     ::SetTextColor(hdc, colOldText);
 233     ::SetBkColor(hdc, colOldBack);
 234
 235     #undef  hdc
 236   #endif  //O_DRAW_NATIVE_API
 237
 238   return TRUE;
 239 }
 240