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 // ============================================================================
  13 // headers & declarations
  14 // ============================================================================
  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/menu.h"
  25 #endif
  26
  27 #include "wx/ownerdrw.h"
  28 #include "wx/menuitem.h"
  29
  30 #include <windows.h>
  31
  32 // ============================================================================
  33 // implementation of wxOwnerDrawn class
  34 // ============================================================================
  35
  36 // ctor
  37 // ----
  38 wxOwnerDrawn::wxOwnerDrawn(const wxTString& str,
  39                            bool bCheckable, bool bMenuItem)
  40             : m_strName(str)
  41 {
  42   m_bCheckable   = bCheckable;
  43   m_bOwnerDrawn  = FALSE;
  44   m_nHeight      = 0;
  45   m_nMarginWidth = ms_nLastMarginWidth;
  46 }
  47
  48 #if defined(__WXMSW__) && defined(__WIN32__)
  49   uint wxOwnerDrawn::ms_nDefaultMarginWidth = GetSystemMetrics(SM_CXMENUCHECK);
  50 #else   // # what is the reasonable default?
  51   uint wxOwnerDrawn::ms_nDefaultMarginWidth = 15;
  52 #endif
  53
  54 uint wxOwnerDrawn::ms_nLastMarginWidth = ms_nDefaultMarginWidth;
  55
  56 // drawing
  57 // -------
  58
  59 // get size of the item
  60 bool wxOwnerDrawn::OnMeasureItem(uint *pwidth, uint *pheight)
  61 {
  62   wxMemoryDC dc;
  63   dc.SetFont(GetFont());
  64
  65   // ## ugly...
  66   char *szStripped = new char[m_strName.Len()];
  67   wxStripMenuCodes((char *)m_strName.c_str(), szStripped);
  68   wxString str = szStripped;
  69   delete [] szStripped;
  70
  71   // # without this menu items look too tightly packed (at least under Windows)
  72   str += 'W'; // 'W' is typically the widest letter
  73
  74   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
  75   m_nHeight = *pheight;                // remember height for use in OnDrawItem
  76
  77   return TRUE;
  78 }
  79
  80 // searching for this macro you'll find all the code where I'm using the native
  81 // Win32 GDI functions and not wxWindows ones. Might help to whoever decides to
  82 // port this code to X. (VZ)
  83
  84 #ifdef __WIN32__
  85 #define   O_DRAW_NATIVE_API     // comments below explain why I use it
  86 #endif
  87
  88 // draw the item
  89 bool wxOwnerDrawn::OnDrawItem(wxDC& dc, const wxRect& rc, wxODAction act, wxODStatus st)
  90 {
  91   // we do nothing on focus change
  92   if ( act == wxODFocusChanged )
  93     return TRUE;
  94
  95   // wxColor <-> RGB
  96   #define   ToRGB(col)  RGB(col.Red(), col.Green(), col.Blue())
  97   #define   UnRGB(col)  GetRValue(col), GetGValue(col), GetBValue(col)
  98
  99   // set the colors
 100   // --------------
 101   DWORD colBack, colText;
 102   if ( st & wxODSelected ) {
 103     colBack = GetSysColor(COLOR_HIGHLIGHT);
 104     colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 105   }
 106   else {
 107     // fall back to default colors if none explicitly specified
 108     colBack = m_colBack.Ok() ? ToRGB(m_colBack) : GetSysColor(COLOR_WINDOW);
 109     colText = m_colText.Ok() ? ToRGB(m_colText) : GetSysColor(COLOR_WINDOWTEXT);
 110   }
 111
 112   #ifdef  O_DRAW_NATIVE_API
 113     #define  hdc           (HDC)dc.GetHDC()
 114     COLORREF colOldText = ::SetTextColor(hdc, colText),
 115              colOldBack = ::SetBkColor(hdc, colBack);
 116   #else
 117     dc.SetTextForeground(wxColor(UnRGB(colText)));
 118     dc.SetTextBackground(wxColor(UnRGB(colBack)));
 119   #endif
 120
 121   // select the font and draw the text
 122   // ---------------------------------
 123
 124   // determine where to draw and leave space for a check-mark.
 125   int x = rc.x + GetMarginWidth();
 126
 127   // using native API because it reckognizes '&'
 128   #ifdef  O_DRAW_NATIVE_API
 129     int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 130     HBRUSH  hbr = CreateSolidBrush(colBack),
 131             hPrevBrush = SelectObject(hdc, hbr);
 132
 133     RECT rectAll = { rc.GetLeft(), rc.GetTop(), rc.GetRight(), rc.GetBottom() };
 134     FillRect(hdc, &rectAll, hbr);
 135
 136     // use default font if no font set
 137     HFONT hfont;
 138     if ( m_font.Ok() ) {
 139       m_font.RealizeResource();
 140       hfont = (HFONT)m_font.GetResourceHandle();
 141     }
 142     else {
 143       hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 144     }
 145
 146     HFONT hPrevFont = ::SelectObject(hdc, hfont);
 147     DrawState(hdc, NULL, NULL,
 148               (LPARAM)(const char *)m_strName, m_strName.Length(),
 149               x, rc.y, rc.GetWidth(), rc.GetHeight(),
 150               DST_PREFIXTEXT | ( st & wxODDisabled ? DSS_DISABLED : 0) );
 151
 152     (void)SelectObject(hdc, hPrevBrush);
 153     (void)SelectObject(hdc, hPrevFont);
 154     (void)SetBkMode(hdc, nPrevMode);
 155   #else
 156     dc.SetFont(GetFont());
 157     dc.DrawText(m_strName, x, rc.y);
 158   #endif  //O_DRAW_NATIVE_API
 159
 160   // draw the bitmap
 161   // ---------------
 162   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 163     if ( st & wxODChecked ) {
 164       // using native APIs for performance and simplicity
 165 #ifdef  O_DRAW_NATIVE_API
 166       // what goes on: DrawFrameControl creates a b/w mask,
 167       // then we copy it to screen to have right colors
 168
 169         // first create a monochrome bitmap in a memory DC
 170       HDC hdcMem = CreateCompatibleDC(hdc);
 171       HBITMAP hbmpCheck = CreateBitmap(GetMarginWidth(), m_nHeight, 1, 1, 0);
 172       SelectObject(hdcMem, hbmpCheck);
 173
 174         // then draw a check mark into it
 175       RECT rect = { 0, 0, GetMarginWidth(), m_nHeight };
 176       DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 177
 178         // finally copy it to screen DC and clean up
 179       BitBlt(hdc, rc.x, rc.y, GetMarginWidth(), m_nHeight,
 180              hdcMem, 0, 0, SRCCOPY);
 181       DeleteDC(hdcMem);
 182 #else
 183         // #### to do: perhaps using Marlett font (create equiv. font under X)
 184 //        wxFAIL("not implemented");
 185 #endif  //O_DRAW_NATIVE_API
 186     }
 187   }
 188   else {
 189     // for uncheckable item we use only the 'checked' bitmap
 190     wxBitmap bmp(GetBitmap(IsCheckable() ? ((st & wxODChecked) != 0) : TRUE));
 191     if ( bmp.Ok() ) {
 192       wxMemoryDC dcMem(&dc);
 193       dcMem.SelectObject(bmp);
 194
 195       // center bitmap
 196       int nBmpWidth = bmp.GetWidth(),
 197           nBmpHeight = bmp.GetHeight();
 198
 199       // there should be enough place!
 200       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 201
 202       dc.Blit(rc.x + (GetMarginWidth() - nBmpWidth) / 2,
 203               rc.y + (m_nHeight - nBmpHeight) /2,
 204               nBmpWidth, nBmpHeight,
 205               &dcMem, 0, 0, wxCOPY);
 206
 207       if ( st & wxODSelected ) {
 208         #ifdef  O_DRAW_NATIVE_API
 209           RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 210                            rc.GetLeft() + GetMarginWidth(),
 211                            rc.GetTop() + m_nHeight };
 212           SetBkColor(hdc, colBack);
 213           DrawEdge(hdc, &rectBmp, EDGE_RAISED, BF_SOFT | BF_RECT);
 214         #else
 215           // ## to write portable DrawEdge
 216         #endif  //O_DRAW_NATIVE_API
 217       }
 218     }
 219   }
 220
 221   #ifdef  O_DRAW_NATIVE_API
 222     ::SetTextColor(hdc, colOldText);
 223     ::SetBkColor(hdc, colOldBack);
 224
 225     #undef  hdc
 226   #endif  //O_DRAW_NATIVE_API
 227
 228   return TRUE;
 229 }
 230