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
  75   wxString str = wxStripMenuCodes(m_strName);
  76
  77   // # without this menu items look too tightly packed (at least under Windows)
  78   str += wxT('W'); // 'W' is typically the widest letter
  79
  80   if (m_font.Ok())
  81       dc.SetFont(GetFont());
  82
  83   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
  84
  85   // JACS: items still look too tightly packed, so adding 2 pixels.
  86   (*pheight) = (*pheight) + 2;
  87
  88   // Ray Gilbert's changes - Corrects the problem of a BMP
  89   // being placed next to text in a menu item, and the BMP does
  90   // not match the size expected by the system.  This will
  91   // resize the space so the BMP will fit.  Without this, BMPs
  92   // must be no larger or smaller than 16x16.
  93   if (m_bmpChecked.Ok())
  94   {
  95       // Is BMP height larger then text height?
  96       size_t adjustedHeight = m_bmpChecked.GetHeight() +
  97                               wxSystemSettings::GetSystemMetric(wxSYS_EDGE_Y);
  98       if (*pheight < adjustedHeight)
  99           *pheight = adjustedHeight;
 100
 101       // Does BMP encroach on default check menu position?
 102       size_t adjustedWidth = m_bmpChecked.GetWidth() +
 103                              (wxSystemSettings::GetSystemMetric(wxSYS_EDGE_X) * 2);
 104       if (ms_nDefaultMarginWidth < adjustedWidth)
 105           *pwidth += adjustedWidth - ms_nDefaultMarginWidth;
 106
 107       // Do we need to widen margin to fit BMP?
 108       if ((size_t)GetMarginWidth() < adjustedWidth)
 109           SetMarginWidth(adjustedWidth);
 110   }
 111
 112   m_nHeight = *pheight;                // remember height for use in OnDrawItem
 113
 114   return TRUE;
 115 }
 116
 117 // searching for this macro you'll find all the code where I'm using the native
 118 // Win32 GDI functions and not wxWindows ones. Might help to whoever decides to
 119 // port this code to X. (VZ)
 120
 121 // JACS: TODO. Why does a disabled but highlighted item still
 122 // get drawn embossed? How can we tell DrawState that we don't want the
 123 // embossing?
 124
 125 #if defined(__WIN32__) && !defined(__SC__) && !defined(__TWIN32__)
 126 #define   O_DRAW_NATIVE_API     // comments below explain why I use it
 127 #endif
 128
 129 // draw the item
 130 bool wxOwnerDrawn::OnDrawItem(wxDC& dc, const wxRect& rc, wxODAction act, wxODStatus st)
 131 {
 132   // we do nothing on focus change
 133   if ( act == wxODFocusChanged )
 134     return TRUE;
 135
 136   // wxColor <-> RGB
 137   #define   ToRGB(col)  RGB(col.Red(), col.Green(), col.Blue())
 138   #define   UnRGB(col)  GetRValue(col), GetGValue(col), GetBValue(col)
 139
 140   // set the colors
 141   // --------------
 142   DWORD colBack, colText;
 143   if ( st & wxODSelected ) {
 144     colBack = GetSysColor(COLOR_HIGHLIGHT);
 145     colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 146   }
 147   else {
 148     // fall back to default colors if none explicitly specified
 149     colBack = m_colBack.Ok() ? ToRGB(m_colBack) : GetSysColor(COLOR_WINDOW);
 150     colText = m_colText.Ok() ? ToRGB(m_colText) : GetSysColor(COLOR_WINDOWTEXT);
 151   }
 152
 153   #ifdef  O_DRAW_NATIVE_API
 154     #define  hdc           (HDC)dc.GetHDC()
 155     COLORREF colOldText = ::SetTextColor(hdc, colText),
 156              colOldBack = ::SetBkColor(hdc, colBack);
 157   #else
 158     dc.SetTextForeground(wxColor(UnRGB(colText)));
 159     dc.SetTextBackground(wxColor(UnRGB(colBack)));
 160   #endif
 161
 162   // select the font and draw the text
 163   // ---------------------------------
 164
 165   // determine where to draw and leave space for a check-mark.
 166   int x = rc.x + GetMarginWidth();
 167
 168   // using native API because it reckognizes '&'
 169   #ifdef  O_DRAW_NATIVE_API
 170     int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 171     HBRUSH hbr = CreateSolidBrush(colBack),
 172            hPrevBrush = (HBRUSH)SelectObject(hdc, hbr);
 173
 174     RECT rectAll = { rc.GetLeft(), rc.GetTop(), rc.GetRight(), rc.GetBottom() };
 175     FillRect(hdc, &rectAll, hbr);
 176
 177     DeleteObject(hbr);
 178
 179     // use default font if no font set
 180     HFONT hfont;
 181     if ( m_font.Ok() ) {
 182       m_font.RealizeResource();
 183       hfont = (HFONT)m_font.GetResourceHandle();
 184     }
 185     else {
 186       hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 187     }
 188
 189     HFONT hPrevFont = (HFONT) ::SelectObject(hdc, hfont);
 190     DrawState(hdc, NULL, NULL,
 191               (LPARAM)(const wxChar *)m_strName, m_strName.Length(),
 192               x, rc.y, rc.GetWidth(), rc.GetHeight(),
 193               DST_PREFIXTEXT | ( st & wxODDisabled ? DSS_DISABLED : 0) );
 194
 195     (void)SelectObject(hdc, hPrevBrush);
 196     (void)SelectObject(hdc, hPrevFont);
 197     (void)SetBkMode(hdc, nPrevMode);
 198   #else
 199     dc.SetFont(GetFont());
 200     dc.DrawText(m_strName, x, rc.y);
 201   #endif  //O_DRAW_NATIVE_API
 202
 203   // draw the bitmap
 204   // ---------------
 205   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 206     if ( st & wxODChecked ) {
 207       // using native APIs for performance and simplicity
 208 #ifdef  O_DRAW_NATIVE_API
 209       // what goes on: DrawFrameControl creates a b/w mask,
 210       // then we copy it to screen to have right colors
 211
 212         // first create a monochrome bitmap in a memory DC
 213       HDC hdcMem = CreateCompatibleDC(hdc);
 214       HBITMAP hbmpCheck = CreateBitmap(GetMarginWidth(), m_nHeight, 1, 1, 0);
 215       SelectObject(hdcMem, hbmpCheck);
 216
 217         // then draw a check mark into it
 218       RECT rect = { 0, 0, GetMarginWidth(), m_nHeight };
 219       if ( m_nHeight > 0 )
 220       {
 221 #ifndef __SC__
 222         DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 223 #endif
 224       }
 225
 226         // finally copy it to screen DC and clean up
 227       BitBlt(hdc, rc.x, rc.y, GetMarginWidth(), m_nHeight,
 228              hdcMem, 0, 0, SRCCOPY);
 229
 230       DeleteDC(hdcMem);
 231       DeleteObject(hbmpCheck);
 232 #else
 233         // #### to do: perhaps using Marlett font (create equiv. font under X)
 234 //        wxFAIL("not implemented");
 235 #endif  //O_DRAW_NATIVE_API
 236     }
 237   }
 238   else {
 239     // for uncheckable item we use only the 'checked' bitmap
 240     wxBitmap bmp(GetBitmap(IsCheckable() ? ((st & wxODChecked) != 0) : TRUE));
 241     if ( bmp.Ok() ) {
 242       wxMemoryDC dcMem(&dc);
 243       dcMem.SelectObject(bmp);
 244
 245       // center bitmap
 246       int nBmpWidth = bmp.GetWidth(),
 247           nBmpHeight = bmp.GetHeight();
 248
 249       // there should be enough place!
 250       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 251
 252       int heightDiff = (m_nHeight - nBmpHeight);
 253 //      if (heightDiff = -1)
 254 //        heightDiff = -2;
 255
 256       //MT: blit with mask enabled.
 257       dc.Blit(rc.x + (GetMarginWidth() - nBmpWidth) / 2,
 258               rc.y + heightDiff / 2,
 259               nBmpWidth, nBmpHeight,
 260               &dcMem, 0, 0, wxCOPY, TRUE);
 261
 262       if ( st & wxODSelected ) {
 263         #ifdef  O_DRAW_NATIVE_API
 264           RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 265                            rc.GetLeft() + GetMarginWidth(),
 266                            rc.GetTop() + m_nHeight };
 267           SetBkColor(hdc, colBack);
 268           DrawEdge(hdc, &rectBmp, EDGE_RAISED, BF_SOFT | BF_RECT);
 269         #else
 270           // ## to write portable DrawEdge
 271         #endif  //O_DRAW_NATIVE_API
 272       }
 273     }
 274   }
 275
 276   #ifdef  O_DRAW_NATIVE_API
 277     ::SetTextColor(hdc, colOldText);
 278     ::SetBkColor(hdc, colOldBack);
 279
 280     #undef  hdc
 281   #endif  //O_DRAW_NATIVE_API
 282
 283   return TRUE;
 284 }
 285
 286
 287 #endif // wxUSE_OWNER_DRAWN
 288