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 #include "wx/msw/private.h"
  19
  20 #ifdef __BORLANDC__
  21 #pragma hdrstop
  22 #endif
  23
  24 #ifndef WX_PRECOMP
  25   #include "wx/window.h"
  26 //  #include "wx/msw/private.h"
  27   #include "wx/font.h"
  28   #include "wx/bitmap.h"
  29   #include "wx/dcmemory.h"
  30   #include "wx/menu.h"
  31   #include "wx/utils.h"
  32 #endif
  33
  34 #include "wx/ownerdrw.h"
  35 #include "wx/menuitem.h"
  36
  37 #if wxUSE_OWNER_DRAWN
  38
  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   wxChar *szStripped = new wxChar[m_strName.Len()];
  75   wxStripMenuCodes((wxChar *)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 += wxT('W'); // 'W' is typically the widest letter
  81
  82   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
  83
  84   // JACS: items still look too tightly packed, so adding 2 pixels.
  85   (*pheight) = (*pheight) + 2;
  86
  87   m_nHeight = *pheight;                // remember height for use in OnDrawItem
  88
  89   return TRUE;
  90 }
  91
  92 // searching for this macro you'll find all the code where I'm using the native
  93 // Win32 GDI functions and not wxWindows ones. Might help to whoever decides to
  94 // port this code to X. (VZ)
  95
  96 // JACS: TODO. Why does a disabled but highlighted item still
  97 // get drawn embossed? How can we tell DrawState that we don't want the
  98 // embossing?
  99
 100 #if defined(__WIN32__) && !defined(__SC__) && !defined(__TWIN32__)
 101 #define   O_DRAW_NATIVE_API     // comments below explain why I use it
 102 #endif
 103
 104 // draw the item
 105 bool wxOwnerDrawn::OnDrawItem(wxDC& dc, const wxRect& rc, wxODAction act, wxODStatus st)
 106 {
 107   // we do nothing on focus change
 108   if ( act == wxODFocusChanged )
 109     return TRUE;
 110
 111   // wxColor <-> RGB
 112   #define   ToRGB(col)  RGB(col.Red(), col.Green(), col.Blue())
 113   #define   UnRGB(col)  GetRValue(col), GetGValue(col), GetBValue(col)
 114
 115   // set the colors
 116   // --------------
 117   DWORD colBack, colText;
 118   if ( st & wxODSelected ) {
 119     colBack = GetSysColor(COLOR_HIGHLIGHT);
 120     colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 121   }
 122   else {
 123     // fall back to default colors if none explicitly specified
 124     colBack = m_colBack.Ok() ? ToRGB(m_colBack) : GetSysColor(COLOR_WINDOW);
 125     colText = m_colText.Ok() ? ToRGB(m_colText) : GetSysColor(COLOR_WINDOWTEXT);
 126   }
 127
 128   #ifdef  O_DRAW_NATIVE_API
 129     #define  hdc           (HDC)dc.GetHDC()
 130     COLORREF colOldText = ::SetTextColor(hdc, colText),
 131              colOldBack = ::SetBkColor(hdc, colBack);
 132   #else
 133     dc.SetTextForeground(wxColor(UnRGB(colText)));
 134     dc.SetTextBackground(wxColor(UnRGB(colBack)));
 135   #endif
 136
 137   // select the font and draw the text
 138   // ---------------------------------
 139
 140   // determine where to draw and leave space for a check-mark.
 141   int x = rc.x + GetMarginWidth();
 142
 143   // using native API because it reckognizes '&'
 144   #ifdef  O_DRAW_NATIVE_API
 145     int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 146     HBRUSH hbr = CreateSolidBrush(colBack),
 147            hPrevBrush = (HBRUSH)SelectObject(hdc, hbr);
 148
 149     RECT rectAll = { rc.GetLeft(), rc.GetTop(), rc.GetRight(), rc.GetBottom() };
 150     FillRect(hdc, &rectAll, hbr);
 151
 152     DeleteObject(hbr);
 153
 154     // use default font if no font set
 155     HFONT hfont;
 156     if ( m_font.Ok() ) {
 157       m_font.RealizeResource();
 158       hfont = (HFONT)m_font.GetResourceHandle();
 159     }
 160     else {
 161       hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 162     }
 163
 164     HFONT hPrevFont = (HFONT) ::SelectObject(hdc, hfont);
 165     DrawState(hdc, NULL, NULL,
 166               (LPARAM)(const wxChar *)m_strName, m_strName.Length(),
 167               x, rc.y, rc.GetWidth(), rc.GetHeight(),
 168               DST_PREFIXTEXT | ( st & wxODDisabled ? DSS_DISABLED : 0) );
 169
 170     (void)SelectObject(hdc, hPrevBrush);
 171     (void)SelectObject(hdc, hPrevFont);
 172     (void)SetBkMode(hdc, nPrevMode);
 173   #else
 174     dc.SetFont(GetFont());
 175     dc.DrawText(m_strName, x, rc.y);
 176   #endif  //O_DRAW_NATIVE_API
 177
 178   // draw the bitmap
 179   // ---------------
 180   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 181     if ( st & wxODChecked ) {
 182       // using native APIs for performance and simplicity
 183 #ifdef  O_DRAW_NATIVE_API
 184       // what goes on: DrawFrameControl creates a b/w mask,
 185       // then we copy it to screen to have right colors
 186
 187         // first create a monochrome bitmap in a memory DC
 188       HDC hdcMem = CreateCompatibleDC(hdc);
 189       HBITMAP hbmpCheck = CreateBitmap(GetMarginWidth(), m_nHeight, 1, 1, 0);
 190       SelectObject(hdcMem, hbmpCheck);
 191
 192         // then draw a check mark into it
 193       RECT rect = { 0, 0, GetMarginWidth(), m_nHeight };
 194       if ( m_nHeight > 0 )
 195       {
 196 #ifndef __SC__
 197         DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 198 #endif
 199       }
 200
 201         // finally copy it to screen DC and clean up
 202       BitBlt(hdc, rc.x, rc.y, GetMarginWidth(), m_nHeight,
 203              hdcMem, 0, 0, SRCCOPY);
 204
 205       DeleteDC(hdcMem);
 206       DeleteObject(hbmpCheck);
 207 #else
 208         // #### to do: perhaps using Marlett font (create equiv. font under X)
 209 //        wxFAIL("not implemented");
 210 #endif  //O_DRAW_NATIVE_API
 211     }
 212   }
 213   else {
 214     // for uncheckable item we use only the 'checked' bitmap
 215     wxBitmap bmp(GetBitmap(IsCheckable() ? ((st & wxODChecked) != 0) : TRUE));
 216     if ( bmp.Ok() ) {
 217       wxMemoryDC dcMem(&dc);
 218       dcMem.SelectObject(bmp);
 219
 220       // center bitmap
 221       int nBmpWidth = bmp.GetWidth(),
 222           nBmpHeight = bmp.GetHeight();
 223
 224       // there should be enough place!
 225       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 226
 227       //MT: blit with mask enabled.
 228       dc.Blit(rc.x + (GetMarginWidth() - nBmpWidth) / 2,
 229               rc.y + (m_nHeight - nBmpHeight) /2,
 230               nBmpWidth, nBmpHeight,
 231               &dcMem, 0, 0, wxCOPY, TRUE);
 232
 233       if ( st & wxODSelected ) {
 234         #ifdef  O_DRAW_NATIVE_API
 235           RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 236                            rc.GetLeft() + GetMarginWidth(),
 237                            rc.GetTop() + m_nHeight };
 238           SetBkColor(hdc, colBack);
 239           DrawEdge(hdc, &rectBmp, EDGE_RAISED, BF_SOFT | BF_RECT);
 240         #else
 241           // ## to write portable DrawEdge
 242         #endif  //O_DRAW_NATIVE_API
 243       }
 244     }
 245   }
 246
 247   #ifdef  O_DRAW_NATIVE_API
 248     ::SetTextColor(hdc, colOldText);
 249     ::SetBkColor(hdc, colOldBack);
 250
 251     #undef  hdc
 252   #endif  //O_DRAW_NATIVE_API
 253
 254   return TRUE;
 255 }
 256
 257
 258 #endif // wxUSE_OWNER_DRAWN
 259