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 #include "wx/fontutil.h"
  38
  39 #if wxUSE_OWNER_DRAWN
  40
  41
  42 // ============================================================================
  43 // implementation of wxOwnerDrawn class
  44 // ============================================================================
  45
  46 // ctor
  47 // ----
  48 wxOwnerDrawn::wxOwnerDrawn(const wxString& str,
  49                            bool bCheckable, bool WXUNUSED(bMenuItem))
  50             : m_strName(str)
  51 {
  52 #if defined(__WXMSW__) && defined(__WIN32__) && defined(SM_CXMENUCHECK)
  53     // get the default menu height and font from the system
  54     NONCLIENTMETRICS nm;
  55     nm.cbSize = sizeof (NONCLIENTMETRICS);
  56     SystemParametersInfo (SPI_GETNONCLIENTMETRICS,0,&nm,0);
  57     m_nMinHeight = nm.iMenuHeight;
  58
  59     // nm.iMenuWidth is the system default for the width of
  60     // menu icons and checkmarks
  61     if (ms_nDefaultMarginWidth == 0)
  62     {
  63        ms_nDefaultMarginWidth = nm.iMenuWidth;
  64        ms_nLastMarginWidth = nm.iMenuWidth;
  65     }
  66
  67     wxNativeFontInfo info;
  68     memcpy(&info.lf, &nm.lfMenuFont, sizeof(LOGFONT));
  69     m_font.Create(info);
  70 #else
  71     // windows clean install default
  72     m_nMinHeight = 18;
  73
  74     if (ms_nDefaultMarginWidth == 0)
  75     {
  76         ms_nDefaultMarginWidth = 18;
  77         ms_nLastMarginWidth = 18;
  78     }
  79     if (wxNORMAL_FONT)
  80        m_font = *wxNORMAL_FONT;
  81 #endif
  82
  83     m_bCheckable   = bCheckable;
  84     m_bOwnerDrawn  = FALSE;
  85     m_nHeight      = 0;
  86     m_nMarginWidth = ms_nLastMarginWidth;
  87 }
  88
  89
  90 // these items will be set during the first invocation of the c'tor,
  91 // because the values will be determined by checking the system settings,
  92 // which is a chunk of code
  93 size_t wxOwnerDrawn::ms_nDefaultMarginWidth = 0;
  94 size_t wxOwnerDrawn::ms_nLastMarginWidth = 0;
  95
  96
  97 // drawing
  98 // -------
  99
 100 // get size of the item
 101 // The item size includes the menu string, the accel string,
 102 // the bitmap and size for a submenu expansion arrow...
 103 bool wxOwnerDrawn::OnMeasureItem(size_t *pwidth, size_t *pheight)
 104 {
 105   wxMemoryDC dc;
 106
 107   wxString str = wxStripMenuCodes(m_strName);
 108
 109   // if we have a valid accel string, then pad out
 110   // the menu string so the menu and accel string are not
 111   // placed ontop of eachother.
 112   if ( !m_strAccel.empty() )
 113    {
 114        str.Pad(str.Length()%8);
 115        str += m_strAccel;
 116    }
 117
 118   if (m_font.Ok())
 119       dc.SetFont(GetFont());
 120
 121   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
 122
 123   if (!m_strAccel.IsEmpty())
 124   {
 125       // measure the accelerator string, and add it's width to
 126       // the total item width, plus 16 (Accelerators are right justified,
 127       // with the right edge of the text rectangle 16 pixels left of
 128       // the right edge of the menu)
 129
 130       int accel_width, accel_height;
 131       dc.GetTextExtent(m_strAccel, &accel_width, &accel_height);
 132       *pwidth += accel_width;
 133   }
 134
 135   // add space at the end of the menu for the submenu expansion arrow
 136   // this will also allow offsetting the accel string from the right edge
 137   *pwidth += GetDefaultMarginWidth()*1.5;
 138
 139   // JACS: items still look too tightly packed, so adding 5 pixels.
 140   (*pheight) = (*pheight) + 5;
 141
 142   // Ray Gilbert's changes - Corrects the problem of a BMP
 143   // being placed next to text in a menu item, and the BMP does
 144   // not match the size expected by the system.  This will
 145   // resize the space so the BMP will fit.  Without this, BMPs
 146   // must be no larger or smaller than 16x16.
 147   if (m_bmpChecked.Ok())
 148   {
 149       // Is BMP height larger then text height?
 150       size_t adjustedHeight = m_bmpChecked.GetHeight() +
 151                               wxSystemSettings::GetMetric(wxSYS_EDGE_Y);
 152       if (*pheight < adjustedHeight)
 153           *pheight = adjustedHeight;
 154
 155       // Does BMP encroach on default check menu position?
 156       size_t adjustedWidth = m_bmpChecked.GetWidth() +
 157                              (wxSystemSettings::GetMetric(wxSYS_EDGE_X) * 2);
 158 //      if (ms_nDefaultMarginWidth < adjustedWidth)
 159 //          *pwidth += adjustedWidth - ms_nDefaultMarginWidth;
 160
 161       // Do we need to widen margin to fit BMP?
 162       if ((size_t)GetMarginWidth() != adjustedWidth)
 163           SetMarginWidth(adjustedWidth);
 164
 165       // add the size of the bitmap to our total size...
 166       *pwidth += GetMarginWidth();
 167   }
 168
 169   // add the size of the bitmap to our total size - even if we don't have
 170   // a bitmap we leave room for one...
 171   *pwidth += GetMarginWidth();
 172
 173   // make sure that this item is at least as
 174   // tall as the user's system settings specify
 175   if (*pheight < m_nMinHeight)
 176     *pheight = m_nMinHeight;
 177
 178   m_nHeight = *pheight;                // remember height for use in OnDrawItem
 179
 180   return TRUE;
 181 }
 182
 183 // searching for this macro you'll find all the code where I'm using the native
 184 // Win32 GDI functions and not wxWindows ones. Might help to whoever decides to
 185 // port this code to X. (VZ)
 186
 187 // JACS: TODO. Why does a disabled but highlighted item still
 188 // get drawn embossed? How can we tell DrawState that we don't want the
 189 // embossing?
 190
 191 #if defined(__WIN32__) && !defined(__SC__) && !defined(__TWIN32__)
 192 #define   O_DRAW_NATIVE_API     // comments below explain why I use it
 193 #endif
 194
 195 // draw the item
 196 bool wxOwnerDrawn::OnDrawItem(wxDC& dc,
 197                               const wxRect& rc,
 198                               wxODAction act,
 199                               wxODStatus st)
 200 {
 201   // we do nothing on focus change
 202   if ( act == wxODFocusChanged )
 203     return TRUE;
 204
 205   // wxColor <-> RGB
 206   #define   ToRGB(col)  PALETTERGB(col.Red(), col.Green(), col.Blue())
 207   #define   UnRGB(col)  GetRValue(col), GetGValue(col), GetBValue(col)
 208
 209   // set the colors
 210   // --------------
 211   DWORD colBack, colText;
 212   if ( st & wxODSelected ) {
 213     colBack = GetSysColor(COLOR_HIGHLIGHT);
 214     if (!(st & wxODDisabled))
 215     {
 216         colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 217     }
 218      else
 219     {
 220         colText = GetSysColor(COLOR_GRAYTEXT);
 221     }
 222   }
 223   else {
 224     // fall back to default colors if none explicitly specified
 225     colBack = m_colBack.Ok() ? ToRGB(m_colBack) : GetSysColor(COLOR_WINDOW);
 226     colText = m_colText.Ok() ? ToRGB(m_colText) : GetSysColor(COLOR_WINDOWTEXT);
 227   }
 228
 229   #ifdef  O_DRAW_NATIVE_API
 230     #define  hdc           (HDC)dc.GetHDC()
 231     COLORREF colOldText = ::SetTextColor(hdc, colText),
 232              colOldBack = ::SetBkColor(hdc, colBack);
 233   #else
 234     dc.SetTextForeground(wxColor(UnRGB(colText)));
 235     dc.SetTextBackground(wxColor(UnRGB(colBack)));
 236   #endif
 237
 238   // select the font and draw the text
 239   // ---------------------------------
 240
 241
 242   // determine where to draw and leave space for a check-mark.
 243   // Add 3 pixel padding so text appears well within highlight rectangle
 244   int x = rc.x + GetMarginWidth() + 3;
 245
 246
 247   // using native API because it reckognizes '&'
 248   #ifdef  O_DRAW_NATIVE_API
 249     int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 250     HBRUSH hbr = CreateSolidBrush(colBack),
 251            hPrevBrush = (HBRUSH)SelectObject(hdc, hbr);
 252
 253     RECT rectFill = { rc.GetLeft(), rc.GetTop(), rc.GetRight()+1, rc.GetBottom() };
 254
 255     if ( st & wxODSelected && m_bmpChecked.Ok()) {
 256         // only draw the highlight under the text, not under
 257         // the bitmap or checkmark; leave a 1-pixel gap.
 258         rectFill.left = GetMarginWidth() + 1;
 259     }
 260
 261     FillRect(hdc, &rectFill, hbr);
 262
 263     // use default font if no font set
 264     HFONT hfont;
 265     if ( m_font.Ok() ) {
 266       m_font.RealizeResource();
 267       hfont = (HFONT)m_font.GetResourceHandle();
 268     }
 269     else {
 270       hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 271     }
 272
 273     HFONT hPrevFont = (HFONT) ::SelectObject(hdc, hfont);
 274
 275     wxString strMenuText = m_strName.BeforeFirst('\t');
 276
 277     SIZE sizeRect;
 278     GetTextExtentPoint32(hdc,strMenuText.c_str(), strMenuText.Length(),&sizeRect);
 279     ::DrawState(hdc, NULL, NULL,
 280                 (LPARAM)strMenuText.c_str(), strMenuText.length(),
 281                 x, rc.y+((rc.GetHeight()-sizeRect.cy)/2.0)-1, // centre text vertically
 282                 rc.GetWidth()-GetMarginWidth(), sizeRect.cy,
 283                 DST_PREFIXTEXT |
 284                 (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0));
 285
 286     if ( !m_strAccel.empty() )
 287     {
 288         // right align accel string with right edge of menu ( offset by the margin width )
 289         ::SetTextAlign(hdc, TA_RIGHT);
 290         ::DrawState(hdc, NULL, NULL,
 291                     (LPARAM)m_strAccel.c_str(), m_strAccel.length(),
 292                     rc.GetWidth()-(GetMarginWidth()), rc.y+(rc.GetHeight()-sizeRect.cy)/2.0,
 293                     rc.GetWidth()-GetMarginWidth(), sizeRect.cy,
 294                     DST_TEXT |
 295                     (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0));
 296         ::SetTextAlign(hdc, TA_LEFT);
 297     }
 298
 299     (void)SelectObject(hdc, hPrevBrush);
 300     (void)SelectObject(hdc, hPrevFont);
 301     (void)SetBkMode(hdc, nPrevMode);
 302
 303     DeleteObject(hbr);
 304   #else
 305     dc.SetFont(GetFont());
 306     dc.DrawText(wxStripMenuCodes(m_strName), x, rc.y);
 307   #endif  //O_DRAW_NATIVE_API
 308
 309   // draw the bitmap
 310   // ---------------
 311   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 312     if ( st & wxODChecked ) {
 313       // using native APIs for performance and simplicity
 314 #ifdef  O_DRAW_NATIVE_API
 315       // what goes on: DrawFrameControl creates a b/w mask,
 316       // then we copy it to screen to have right colors
 317
 318         // first create a monochrome bitmap in a memory DC
 319       HDC hdcMem = CreateCompatibleDC(hdc);
 320       HBITMAP hbmpCheck = CreateBitmap(GetMarginWidth(), m_nHeight, 1, 1, 0);
 321       SelectObject(hdcMem, hbmpCheck);
 322
 323         // then draw a check mark into it
 324       RECT rect = { 0, 0, GetMarginWidth(), m_nHeight };
 325       if ( m_nHeight > 0 )
 326       {
 327         ::DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 328       }
 329
 330         // finally copy it to screen DC and clean up
 331       BitBlt(hdc, rc.x, rc.y, GetMarginWidth(), m_nHeight,
 332              hdcMem, 0, 0, SRCCOPY);
 333
 334       DeleteDC(hdcMem);
 335       DeleteObject(hbmpCheck);
 336 #else
 337         // #### to do: perhaps using Marlett font (create equiv. font under X)
 338 //        wxFAIL("not implemented");
 339 #endif  //O_DRAW_NATIVE_API
 340     }
 341   }
 342   else {
 343     // for uncheckable item we use only the 'checked' bitmap
 344     wxBitmap bmp(GetBitmap(IsCheckable() ? ((st & wxODChecked) != 0) : TRUE));
 345     if ( bmp.Ok() ) {
 346       wxMemoryDC dcMem(&dc);
 347       dcMem.SelectObject(bmp);
 348
 349       // center bitmap
 350       int nBmpWidth = bmp.GetWidth(),
 351           nBmpHeight = bmp.GetHeight();
 352
 353       // there should be enough place!
 354       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 355
 356       int heightDiff = m_nHeight - nBmpHeight;
 357       dc.Blit(rc.x + (GetMarginWidth() - nBmpWidth) / 2,
 358               rc.y + heightDiff / 2,
 359               nBmpWidth, nBmpHeight,
 360               &dcMem, 0, 0, wxCOPY, TRUE /* use mask */);
 361
 362       if ( st & wxODSelected ) {
 363         #ifdef  O_DRAW_NATIVE_API
 364           RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 365                            rc.GetLeft() + GetMarginWidth(),
 366                            rc.GetTop() + m_nHeight-1 };
 367           SetBkColor(hdc, colBack);
 368           DrawEdge(hdc, &rectBmp, EDGE_RAISED, BF_SOFT | BF_RECT);
 369         #else
 370           int x1, y1, x2, y2;
 371           x1 = rc.x;
 372           y1 = rc.y;
 373           x2 = x1 + GetMarginWidth() - 1;
 374           y2 = y1 + m_nHeight - 1;
 375
 376           dc.SetPen(*wxWHITE_PEN);
 377           dc.DrawLine(x1, y1, x2, y1);
 378           dc.DrawLine(x1, y1, x1, y2);
 379           dc.SetPen(*wxGREY_PEN);
 380           dc.DrawLine(x1, y2-1, x2, y2-1);
 381           dc.DrawLine(x2, y1, x2, y2);
 382         #endif  //O_DRAW_NATIVE_API
 383       }
 384     }
 385   }
 386
 387   #ifdef  O_DRAW_NATIVE_API
 388     ::SetTextColor(hdc, colOldText);
 389     ::SetBkColor(hdc, colOldBack);
 390
 391     #undef  hdc
 392   #endif  //O_DRAW_NATIVE_API
 393
 394   return TRUE;
 395 }
 396
 397
 398 #endif // wxUSE_OWNER_DRAWN
 399