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   wxChar *szStripped = new wxChar[m_strName.Len()];
  72   wxStripMenuCodes((wxChar *)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 += wxT('W'); // 'W' is typically the widest letter
  78
  79   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
  80
  81   // JACS: items still look too tightly packed, so adding 2 pixels.
  82   (*pheight) = (*pheight) + 2;
  83
  84   m_nHeight = *pheight;                // remember height for use in OnDrawItem
  85
  86   return TRUE;
  87 }
  88
  89 // searching for this macro you'll find all the code where I'm using the native
  90 // Win32 GDI functions and not wxWindows ones. Might help to whoever decides to
  91 // port this code to X. (VZ)
  92
  93 // JACS: TODO. Why does a disabled but highlighted item still
  94 // get drawn embossed? How can we tell DrawState that we don't want the
  95 // embossing?
  96
  97 #if defined(__WIN32__) && !defined(__SC__) && !defined(__TWIN32__)
  98 #define   O_DRAW_NATIVE_API     // comments below explain why I use it
  99 #endif
 100
 101 // draw the item
 102 bool wxOwnerDrawn::OnDrawItem(wxDC& dc, const wxRect& rc, wxODAction act, wxODStatus st)
 103 {
 104   // we do nothing on focus change
 105   if ( act == wxODFocusChanged )
 106     return TRUE;
 107
 108   // wxColor <-> RGB
 109   #define   ToRGB(col)  RGB(col.Red(), col.Green(), col.Blue())
 110   #define   UnRGB(col)  GetRValue(col), GetGValue(col), GetBValue(col)
 111
 112   // set the colors
 113   // --------------
 114   DWORD colBack, colText;
 115   if ( st & wxODSelected ) {
 116     colBack = GetSysColor(COLOR_HIGHLIGHT);
 117     colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 118   }
 119   else {
 120     // fall back to default colors if none explicitly specified
 121     colBack = m_colBack.Ok() ? ToRGB(m_colBack) : GetSysColor(COLOR_WINDOW);
 122     colText = m_colText.Ok() ? ToRGB(m_colText) : GetSysColor(COLOR_WINDOWTEXT);
 123   }
 124
 125   #ifdef  O_DRAW_NATIVE_API
 126     #define  hdc           (HDC)dc.GetHDC()
 127     COLORREF colOldText = ::SetTextColor(hdc, colText),
 128              colOldBack = ::SetBkColor(hdc, colBack);
 129   #else
 130     dc.SetTextForeground(wxColor(UnRGB(colText)));
 131     dc.SetTextBackground(wxColor(UnRGB(colBack)));
 132   #endif
 133
 134   // select the font and draw the text
 135   // ---------------------------------
 136
 137   // determine where to draw and leave space for a check-mark.
 138   int x = rc.x + GetMarginWidth();
 139
 140   // using native API because it reckognizes '&'
 141   #ifdef  O_DRAW_NATIVE_API
 142     int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 143     HBRUSH hbr = CreateSolidBrush(colBack),
 144            hPrevBrush = (HBRUSH)SelectObject(hdc, hbr);
 145
 146     RECT rectAll = { rc.GetLeft(), rc.GetTop(), rc.GetRight(), rc.GetBottom() };
 147     FillRect(hdc, &rectAll, hbr);
 148
 149     DeleteObject(hbr);
 150
 151     // use default font if no font set
 152     HFONT hfont;
 153     if ( m_font.Ok() ) {
 154       m_font.RealizeResource();
 155       hfont = (HFONT)m_font.GetResourceHandle();
 156     }
 157     else {
 158       hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 159     }
 160
 161     HFONT hPrevFont = (HFONT) ::SelectObject(hdc, hfont);
 162     DrawState(hdc, NULL, NULL,
 163               (LPARAM)(const wxChar *)m_strName, m_strName.Length(),
 164               x, rc.y, rc.GetWidth(), rc.GetHeight(),
 165               DST_PREFIXTEXT | ( st & wxODDisabled ? DSS_DISABLED : 0) );
 166
 167     (void)SelectObject(hdc, hPrevBrush);
 168     (void)SelectObject(hdc, hPrevFont);
 169     (void)SetBkMode(hdc, nPrevMode);
 170   #else
 171     dc.SetFont(GetFont());
 172     dc.DrawText(m_strName, x, rc.y);
 173   #endif  //O_DRAW_NATIVE_API
 174
 175   // draw the bitmap
 176   // ---------------
 177   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 178     if ( st & wxODChecked ) {
 179       // using native APIs for performance and simplicity
 180 #ifdef  O_DRAW_NATIVE_API
 181       // what goes on: DrawFrameControl creates a b/w mask,
 182       // then we copy it to screen to have right colors
 183
 184         // first create a monochrome bitmap in a memory DC
 185       HDC hdcMem = CreateCompatibleDC(hdc);
 186       HBITMAP hbmpCheck = CreateBitmap(GetMarginWidth(), m_nHeight, 1, 1, 0);
 187       SelectObject(hdcMem, hbmpCheck);
 188
 189         // then draw a check mark into it
 190       RECT rect = { 0, 0, GetMarginWidth(), m_nHeight };
 191       if ( m_nHeight > 0 )
 192       {
 193 #ifndef __SC__
 194         DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 195 #endif
 196       }
 197
 198         // finally copy it to screen DC and clean up
 199       BitBlt(hdc, rc.x, rc.y, GetMarginWidth(), m_nHeight,
 200              hdcMem, 0, 0, SRCCOPY);
 201
 202       DeleteDC(hdcMem);
 203       DeleteObject(hbmpCheck);
 204 #else
 205         // #### to do: perhaps using Marlett font (create equiv. font under X)
 206 //        wxFAIL("not implemented");
 207 #endif  //O_DRAW_NATIVE_API
 208     }
 209   }
 210   else {
 211     // for uncheckable item we use only the 'checked' bitmap
 212     wxBitmap bmp(GetBitmap(IsCheckable() ? ((st & wxODChecked) != 0) : TRUE));
 213     if ( bmp.Ok() ) {
 214       wxMemoryDC dcMem(&dc);
 215       dcMem.SelectObject(bmp);
 216
 217       // center bitmap
 218       int nBmpWidth = bmp.GetWidth(),
 219           nBmpHeight = bmp.GetHeight();
 220
 221       // there should be enough place!
 222       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 223
 224       //MT: blit with mask enabled.
 225       dc.Blit(rc.x + (GetMarginWidth() - nBmpWidth) / 2,
 226               rc.y + (m_nHeight - nBmpHeight) /2,
 227               nBmpWidth, nBmpHeight,
 228               &dcMem, 0, 0, wxCOPY, TRUE);
 229
 230       if ( st & wxODSelected ) {
 231         #ifdef  O_DRAW_NATIVE_API
 232           RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 233                            rc.GetLeft() + GetMarginWidth(),
 234                            rc.GetTop() + m_nHeight };
 235           SetBkColor(hdc, colBack);
 236           DrawEdge(hdc, &rectBmp, EDGE_RAISED, BF_SOFT | BF_RECT);
 237         #else
 238           // ## to write portable DrawEdge
 239         #endif  //O_DRAW_NATIVE_API
 240       }
 241     }
 242   }
 243
 244   #ifdef  O_DRAW_NATIVE_API
 245     ::SetTextColor(hdc, colOldText);
 246     ::SetBkColor(hdc, colOldBack);
 247
 248     #undef  hdc
 249   #endif  //O_DRAW_NATIVE_API
 250
 251   return TRUE;
 252 }
 253