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/settings.h"
  35 #include "wx/ownerdrw.h"
  36 #include "wx/menuitem.h"
  37
  38 #if wxUSE_OWNER_DRAWN
  39
  40
  41 // ============================================================================
  42 // implementation of wxOwnerDrawn class
  43 // ============================================================================
  44
  45 // ctor
  46 // ----
  47 wxOwnerDrawn::wxOwnerDrawn(const wxString& str,
  48                            bool bCheckable, bool bMenuItem)
  49             : m_strName(str)
  50 {
  51   m_bCheckable   = bCheckable;
  52   m_bOwnerDrawn  = FALSE;
  53   m_nHeight      = 0;
  54   m_nMarginWidth = ms_nLastMarginWidth;
  55   if (wxNORMAL_FONT)
  56     m_font = * wxNORMAL_FONT;
  57 }
  58
  59 #if defined(__WXMSW__) && defined(__WIN32__) && defined(SM_CXMENUCHECK)
  60   size_t wxOwnerDrawn::ms_nDefaultMarginWidth = GetSystemMetrics(SM_CXMENUCHECK);
  61 #else   // # what is the reasonable default?
  62   size_t wxOwnerDrawn::ms_nDefaultMarginWidth = 15;
  63 #endif
  64
  65 size_t wxOwnerDrawn::ms_nLastMarginWidth = ms_nDefaultMarginWidth;
  66
  67 // drawing
  68 // -------
  69
  70 // get size of the item
  71 bool wxOwnerDrawn::OnMeasureItem(size_t *pwidth, size_t *pheight)
  72 {
  73   wxMemoryDC dc;
  74   dc.SetFont(GetFont());
  75
  76   // ## ugly...
  77   wxChar *szStripped = new wxChar[m_strName.Len()];
  78   wxStripMenuCodes((wxChar *)m_strName.c_str(), szStripped);
  79   wxString str = szStripped;
  80   delete [] szStripped;
  81
  82   // # without this menu items look too tightly packed (at least under Windows)
  83   str += wxT('W'); // 'W' is typically the widest letter
  84
  85   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
  86
  87   // JACS: items still look too tightly packed, so adding 2 pixels.
  88   (*pheight) = (*pheight) + 2;
  89
  90   m_nHeight = *pheight;                // remember height for use in OnDrawItem
  91
  92   return TRUE;
  93 }
  94
  95 // searching for this macro you'll find all the code where I'm using the native
  96 // Win32 GDI functions and not wxWindows ones. Might help to whoever decides to
  97 // port this code to X. (VZ)
  98
  99 // JACS: TODO. Why does a disabled but highlighted item still
 100 // get drawn embossed? How can we tell DrawState that we don't want the
 101 // embossing?
 102
 103 #if defined(__WIN32__) && !defined(__SC__) && !defined(__TWIN32__)
 104 #define   O_DRAW_NATIVE_API     // comments below explain why I use it
 105 #endif
 106
 107 // draw the item
 108 bool wxOwnerDrawn::OnDrawItem(wxDC& dc, const wxRect& rc, wxODAction act, wxODStatus st)
 109 {
 110   // we do nothing on focus change
 111   if ( act == wxODFocusChanged )
 112     return TRUE;
 113
 114   // wxColor <-> RGB
 115   #define   ToRGB(col)  RGB(col.Red(), col.Green(), col.Blue())
 116   #define   UnRGB(col)  GetRValue(col), GetGValue(col), GetBValue(col)
 117
 118   // set the colors
 119   // --------------
 120   DWORD colBack, colText;
 121   if ( st & wxODSelected ) {
 122     colBack = GetSysColor(COLOR_HIGHLIGHT);
 123     colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 124   }
 125   else {
 126     // fall back to default colors if none explicitly specified
 127     colBack = m_colBack.Ok() ? ToRGB(m_colBack) : GetSysColor(COLOR_WINDOW);
 128     colText = m_colText.Ok() ? ToRGB(m_colText) : GetSysColor(COLOR_WINDOWTEXT);
 129   }
 130
 131   #ifdef  O_DRAW_NATIVE_API
 132     #define  hdc           (HDC)dc.GetHDC()
 133     COLORREF colOldText = ::SetTextColor(hdc, colText),
 134              colOldBack = ::SetBkColor(hdc, colBack);
 135   #else
 136     dc.SetTextForeground(wxColor(UnRGB(colText)));
 137     dc.SetTextBackground(wxColor(UnRGB(colBack)));
 138   #endif
 139
 140   // select the font and draw the text
 141   // ---------------------------------
 142
 143   // determine where to draw and leave space for a check-mark.
 144   int x = rc.x + GetMarginWidth();
 145
 146   // using native API because it reckognizes '&'
 147   #ifdef  O_DRAW_NATIVE_API
 148     int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 149     HBRUSH hbr = CreateSolidBrush(colBack),
 150            hPrevBrush = (HBRUSH)SelectObject(hdc, hbr);
 151
 152     RECT rectAll = { rc.GetLeft(), rc.GetTop(), rc.GetRight(), rc.GetBottom() };
 153     FillRect(hdc, &rectAll, hbr);
 154
 155     DeleteObject(hbr);
 156
 157     // use default font if no font set
 158     HFONT hfont;
 159     if ( m_font.Ok() ) {
 160       m_font.RealizeResource();
 161       hfont = (HFONT)m_font.GetResourceHandle();
 162     }
 163     else {
 164       hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 165     }
 166
 167     HFONT hPrevFont = (HFONT) ::SelectObject(hdc, hfont);
 168     DrawState(hdc, NULL, NULL,
 169               (LPARAM)(const wxChar *)m_strName, m_strName.Length(),
 170               x, rc.y, rc.GetWidth(), rc.GetHeight(),
 171               DST_PREFIXTEXT | ( st & wxODDisabled ? DSS_DISABLED : 0) );
 172
 173     (void)SelectObject(hdc, hPrevBrush);
 174     (void)SelectObject(hdc, hPrevFont);
 175     (void)SetBkMode(hdc, nPrevMode);
 176   #else
 177     dc.SetFont(GetFont());
 178     dc.DrawText(m_strName, x, rc.y);
 179   #endif  //O_DRAW_NATIVE_API
 180
 181   // draw the bitmap
 182   // ---------------
 183   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 184     if ( st & wxODChecked ) {
 185       // using native APIs for performance and simplicity
 186 #ifdef  O_DRAW_NATIVE_API
 187       // what goes on: DrawFrameControl creates a b/w mask,
 188       // then we copy it to screen to have right colors
 189
 190         // first create a monochrome bitmap in a memory DC
 191       HDC hdcMem = CreateCompatibleDC(hdc);
 192       HBITMAP hbmpCheck = CreateBitmap(GetMarginWidth(), m_nHeight, 1, 1, 0);
 193       SelectObject(hdcMem, hbmpCheck);
 194
 195         // then draw a check mark into it
 196       RECT rect = { 0, 0, GetMarginWidth(), m_nHeight };
 197       if ( m_nHeight > 0 )
 198       {
 199 #ifndef __SC__
 200         DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 201 #endif
 202       }
 203
 204         // finally copy it to screen DC and clean up
 205       BitBlt(hdc, rc.x, rc.y, GetMarginWidth(), m_nHeight,
 206              hdcMem, 0, 0, SRCCOPY);
 207
 208       DeleteDC(hdcMem);
 209       DeleteObject(hbmpCheck);
 210 #else
 211         // #### to do: perhaps using Marlett font (create equiv. font under X)
 212 //        wxFAIL("not implemented");
 213 #endif  //O_DRAW_NATIVE_API
 214     }
 215   }
 216   else {
 217     // for uncheckable item we use only the 'checked' bitmap
 218     wxBitmap bmp(GetBitmap(IsCheckable() ? ((st & wxODChecked) != 0) : TRUE));
 219     if ( bmp.Ok() ) {
 220       wxMemoryDC dcMem(&dc);
 221       dcMem.SelectObject(bmp);
 222
 223       // center bitmap
 224       int nBmpWidth = bmp.GetWidth(),
 225           nBmpHeight = bmp.GetHeight();
 226
 227       // there should be enough place!
 228       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 229
 230       //MT: blit with mask enabled.
 231       dc.Blit(rc.x + (GetMarginWidth() - nBmpWidth) / 2,
 232               rc.y + (m_nHeight - nBmpHeight) /2,
 233               nBmpWidth, nBmpHeight,
 234               &dcMem, 0, 0, wxCOPY, TRUE);
 235
 236       if ( st & wxODSelected ) {
 237         #ifdef  O_DRAW_NATIVE_API
 238           RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 239                            rc.GetLeft() + GetMarginWidth(),
 240                            rc.GetTop() + m_nHeight };
 241           SetBkColor(hdc, colBack);
 242           DrawEdge(hdc, &rectBmp, EDGE_RAISED, BF_SOFT | BF_RECT);
 243         #else
 244           // ## to write portable DrawEdge
 245         #endif  //O_DRAW_NATIVE_API
 246       }
 247     }
 248   }
 249
 250   #ifdef  O_DRAW_NATIVE_API
 251     ::SetTextColor(hdc, colOldText);
 252     ::SetBkColor(hdc, colOldBack);
 253
 254     #undef  hdc
 255   #endif  //O_DRAW_NATIVE_API
 256
 257   return TRUE;
 258 }
 259
 260
 261 #endif // wxUSE_OWNER_DRAWN
 262