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