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/window.h"
  25   #include "wx/msw/private.h"
  26   #include "wx/font.h"
  27   #include "wx/bitmap.h"
  28   #include "wx/dcmemory.h"
  29   #include "wx/menu.h"
  30   #include "wx/utils.h"
  31 #endif
  32
  33 #include "wx/ownerdrw.h"
  34 #include "wx/menuitem.h"
  35
  36
  37 // ============================================================================
  38 // implementation of wxOwnerDrawn class
  39 // ============================================================================
  40
  41 // ctor
  42 // ----
  43 wxOwnerDrawn::wxOwnerDrawn(const wxString& str,
  44                            bool bCheckable, bool bMenuItem)
  45             : m_strName(str)
  46 {
  47   m_bCheckable   = bCheckable;
  48   m_bOwnerDrawn  = FALSE;
  49   m_nHeight      = 0;
  50   m_nMarginWidth = ms_nLastMarginWidth;
  51 }
  52
  53 #if defined(__WXMSW__) && defined(__WIN32__) && defined(SM_CXMENUCHECK)
  54   size_t wxOwnerDrawn::ms_nDefaultMarginWidth = GetSystemMetrics(SM_CXMENUCHECK);
  55 #else   // # what is the reasonable default?
  56   size_t wxOwnerDrawn::ms_nDefaultMarginWidth = 15;
  57 #endif
  58
  59 size_t wxOwnerDrawn::ms_nLastMarginWidth = ms_nDefaultMarginWidth;
  60
  61 // drawing
  62 // -------
  63
  64 // get size of the item
  65 bool wxOwnerDrawn::OnMeasureItem(size_t *pwidth, size_t *pheight)
  66 {
  67   wxMemoryDC dc;
  68   dc.SetFont(GetFont());
  69
  70   // ## ugly...
  71   char *szStripped = new char[m_strName.Len()];
  72   wxStripMenuCodes((char *)m_strName.c_str(), szStripped);
  73   wxString str = szStripped;
  74   delete [] szStripped;
  75
  76   // # without this menu items look too tightly packed (at least under Windows)
  77   str += 'W'; // 'W' is typically the widest letter
  78
  79   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
  80   m_nHeight = *pheight;                // remember height for use in OnDrawItem
  81
  82   return TRUE;
  83 }
  84
  85 // searching for this macro you'll find all the code where I'm using the native
  86 // Win32 GDI functions and not wxWindows ones. Might help to whoever decides to
  87 // port this code to X. (VZ)
  88
  89 #if defined(__WIN32__) && !defined(__SC__) && !defined(__TWIN32__)
  90 #define   O_DRAW_NATIVE_API     // comments below explain why I use it
  91 #endif
  92
  93 // draw the item
  94 bool wxOwnerDrawn::OnDrawItem(wxDC& dc, const wxRect& rc, wxODAction act, wxODStatus st)
  95 {
  96   // we do nothing on focus change
  97   if ( act == wxODFocusChanged )
  98     return TRUE;
  99
 100   // wxColor <-> RGB
 101   #define   ToRGB(col)  RGB(col.Red(), col.Green(), col.Blue())
 102   #define   UnRGB(col)  GetRValue(col), GetGValue(col), GetBValue(col)
 103
 104   // set the colors
 105   // --------------
 106   DWORD colBack, colText;
 107   if ( st & wxODSelected ) {
 108     colBack = GetSysColor(COLOR_HIGHLIGHT);
 109     colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 110   }
 111   else {
 112     // fall back to default colors if none explicitly specified
 113     colBack = m_colBack.Ok() ? ToRGB(m_colBack) : GetSysColor(COLOR_WINDOW);
 114     colText = m_colText.Ok() ? ToRGB(m_colText) : GetSysColor(COLOR_WINDOWTEXT);
 115   }
 116
 117   #ifdef  O_DRAW_NATIVE_API
 118     #define  hdc           (HDC)dc.GetHDC()
 119     COLORREF colOldText = ::SetTextColor(hdc, colText),
 120              colOldBack = ::SetBkColor(hdc, colBack);
 121   #else
 122     dc.SetTextForeground(wxColor(UnRGB(colText)));
 123     dc.SetTextBackground(wxColor(UnRGB(colBack)));
 124   #endif
 125
 126   // select the font and draw the text
 127   // ---------------------------------
 128
 129   // determine where to draw and leave space for a check-mark.
 130   int x = rc.x + GetMarginWidth();
 131
 132   // using native API because it reckognizes '&'
 133   #ifdef  O_DRAW_NATIVE_API
 134     int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 135     HBRUSH  hbr = CreateSolidBrush(colBack),
 136             hPrevBrush = (HBRUSH) SelectObject(hdc, hbr);
 137
 138     RECT rectAll = { rc.GetLeft(), rc.GetTop(), rc.GetRight(), rc.GetBottom() };
 139     FillRect(hdc, &rectAll, hbr);
 140
 141     // use default font if no font set
 142     HFONT hfont;
 143     if ( m_font.Ok() ) {
 144       m_font.RealizeResource();
 145       hfont = (HFONT)m_font.GetResourceHandle();
 146     }
 147     else {
 148       hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 149     }
 150
 151     HFONT hPrevFont = (HFONT) ::SelectObject(hdc, hfont);
 152     DrawState(hdc, NULL, NULL,
 153               (LPARAM)(const char *)m_strName, m_strName.Length(),
 154               x, rc.y, rc.GetWidth(), rc.GetHeight(),
 155               DST_PREFIXTEXT | ( st & wxODDisabled ? DSS_DISABLED : 0) );
 156
 157     (void)SelectObject(hdc, hPrevBrush);
 158     (void)SelectObject(hdc, hPrevFont);
 159     (void)SetBkMode(hdc, nPrevMode);
 160   #else
 161     dc.SetFont(GetFont());
 162     dc.DrawText(m_strName, x, rc.y);
 163   #endif  //O_DRAW_NATIVE_API
 164
 165   // draw the bitmap
 166   // ---------------
 167   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 168     if ( st & wxODChecked ) {
 169       // using native APIs for performance and simplicity
 170 #ifdef  O_DRAW_NATIVE_API
 171       // what goes on: DrawFrameControl creates a b/w mask,
 172       // then we copy it to screen to have right colors
 173
 174         // first create a monochrome bitmap in a memory DC
 175       HDC hdcMem = CreateCompatibleDC(hdc);
 176       HBITMAP hbmpCheck = CreateBitmap(GetMarginWidth(), m_nHeight, 1, 1, 0);
 177       SelectObject(hdcMem, hbmpCheck);
 178
 179         // then draw a check mark into it
 180       RECT rect = { 0, 0, GetMarginWidth(), m_nHeight };
 181 #ifndef __SC__
 182       DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 183 #endif
 184
 185         // finally copy it to screen DC and clean up
 186       BitBlt(hdc, rc.x, rc.y, GetMarginWidth(), m_nHeight,
 187              hdcMem, 0, 0, SRCCOPY);
 188       DeleteDC(hdcMem);
 189 #else
 190         // #### to do: perhaps using Marlett font (create equiv. font under X)
 191 //        wxFAIL("not implemented");
 192 #endif  //O_DRAW_NATIVE_API
 193     }
 194   }
 195   else {
 196     // for uncheckable item we use only the 'checked' bitmap
 197     wxBitmap bmp(GetBitmap(IsCheckable() ? ((st & wxODChecked) != 0) : TRUE));
 198     if ( bmp.Ok() ) {
 199       wxMemoryDC dcMem(&dc);
 200       dcMem.SelectObject(bmp);
 201
 202       // center bitmap
 203       int nBmpWidth = bmp.GetWidth(),
 204           nBmpHeight = bmp.GetHeight();
 205
 206       // there should be enough place!
 207       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 208
 209       dc.Blit(rc.x + (GetMarginWidth() - nBmpWidth) / 2,
 210               rc.y + (m_nHeight - nBmpHeight) /2,
 211               nBmpWidth, nBmpHeight,
 212               &dcMem, 0, 0, wxCOPY);
 213
 214       if ( st & wxODSelected ) {
 215         #ifdef  O_DRAW_NATIVE_API
 216           RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 217                            rc.GetLeft() + GetMarginWidth(),
 218                            rc.GetTop() + m_nHeight };
 219           SetBkColor(hdc, colBack);
 220           DrawEdge(hdc, &rectBmp, EDGE_RAISED, BF_SOFT | BF_RECT);
 221         #else
 222           // ## to write portable DrawEdge
 223         #endif  //O_DRAW_NATIVE_API
 224       }
 225     }
 226   }
 227
 228   #ifdef  O_DRAW_NATIVE_API
 229     ::SetTextColor(hdc, colOldText);
 230     ::SetBkColor(hdc, colOldBack);
 231
 232     #undef  hdc
 233   #endif  //O_DRAW_NATIVE_API
 234
 235   return TRUE;
 236 }
 237