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 licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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 #include "wx/module.h"
  39
  40 #if wxUSE_OWNER_DRAWN
  41
  42 class wxMSWSystemMenuFontModule : public wxModule
  43 {
  44 public:
  45
  46     virtual bool OnInit()
  47     {
  48         ms_systemMenuFont = new wxFont;
  49
  50 #if defined(__WXMSW__) && defined(__WIN32__) && defined(SM_CXMENUCHECK)
  51         NONCLIENTMETRICS nm;
  52         nm.cbSize = sizeof(NONCLIENTMETRICS);
  53         SystemParametersInfo(SPI_GETNONCLIENTMETRICS,0,&nm,0);
  54
  55         ms_systemMenuButtonWidth = nm.iMenuHeight;
  56         ms_systemMenuHeight = nm.iMenuHeight;
  57
  58         // create menu font
  59         wxNativeFontInfo info;
  60         memcpy(&info.lf, &nm.lfMenuFont, sizeof(LOGFONT));
  61         ms_systemMenuFont->Create(info);
  62 #endif
  63
  64         return true;
  65     }
  66
  67     virtual void OnExit()
  68     {
  69         delete ms_systemMenuFont;
  70         ms_systemMenuFont = NULL;
  71     }
  72
  73     static wxFont* ms_systemMenuFont;
  74     static int ms_systemMenuButtonWidth;   // windows clean install default
  75     static int ms_systemMenuHeight;        // windows clean install default
  76 private:
  77     DECLARE_DYNAMIC_CLASS(wxMSWSystemMenuFontModule)
  78 };
  79
  80 // these static variables are by the wxMSWSystemMenuFontModule object
  81 // and reflect the system settings returned by the Win32 API's
  82 // SystemParametersInfo() call.
  83
  84 wxFont* wxMSWSystemMenuFontModule::ms_systemMenuFont = NULL;
  85 int wxMSWSystemMenuFontModule::ms_systemMenuButtonWidth = 18;   // windows clean install default
  86 int wxMSWSystemMenuFontModule::ms_systemMenuHeight = 18;        // windows clean install default
  87
  88 IMPLEMENT_DYNAMIC_CLASS(wxMSWSystemMenuFontModule, wxModule)
  89
  90 // ============================================================================
  91 // implementation of wxOwnerDrawn class
  92 // ============================================================================
  93
  94 // ctor
  95 // ----
  96 wxOwnerDrawn::wxOwnerDrawn(const wxString& str,
  97                            bool bCheckable, bool bMenuItem)
  98             : m_strName(str)
  99 {
 100     // get the default menu height and font from the system
 101     NONCLIENTMETRICS nm;
 102     nm.cbSize = sizeof (NONCLIENTMETRICS);
 103     SystemParametersInfo (SPI_GETNONCLIENTMETRICS,0,&nm,0);
 104     m_nMinHeight = nm.iMenuHeight;
 105
 106     // nm.iMenuWidth is the system default for the width of
 107     // menu icons and checkmarks
 108     if (ms_nDefaultMarginWidth == 0)
 109     {
 110        ms_nDefaultMarginWidth = wxMSWSystemMenuFontModule::ms_systemMenuButtonWidth;
 111        ms_nLastMarginWidth = wxMSWSystemMenuFontModule::ms_systemMenuButtonWidth;
 112     }
 113
 114     if (wxMSWSystemMenuFontModule::ms_systemMenuFont->Ok() && bMenuItem)
 115     {
 116         m_font = *wxMSWSystemMenuFontModule::ms_systemMenuFont;
 117     }
 118     else
 119     {
 120         m_font = *wxNORMAL_FONT;
 121     }
 122
 123     m_bCheckable   = bCheckable;
 124     m_bOwnerDrawn  = false;
 125     m_nHeight      = 0;
 126     m_nMarginWidth = ms_nLastMarginWidth;
 127     m_nMinHeight   = wxMSWSystemMenuFontModule::ms_systemMenuHeight;
 128
 129     m_bmpDisabled = wxNullBitmap;
 130 }
 131
 132
 133 // these items will be set during the first invocation of the c'tor,
 134 // because the values will be determined by checking the system settings,
 135 // which is a chunk of code
 136 size_t wxOwnerDrawn::ms_nDefaultMarginWidth = 0;
 137 size_t wxOwnerDrawn::ms_nLastMarginWidth = 0;
 138
 139
 140 // drawing
 141 // -------
 142
 143 // get size of the item
 144 // The item size includes the menu string, the accel string,
 145 // the bitmap and size for a submenu expansion arrow...
 146 bool wxOwnerDrawn::OnMeasureItem(size_t *pwidth, size_t *pheight)
 147 {
 148   wxMemoryDC dc;
 149
 150   wxString str = wxStripMenuCodes(m_strName);
 151
 152   // if we have a valid accel string, then pad out
 153   // the menu string so the menu and accel string are not
 154   // placed ontop of eachother.
 155   if ( !m_strAccel.empty() )
 156    {
 157        str.Pad(str.Length()%8);
 158        str += m_strAccel;
 159    }
 160
 161   if (m_font.Ok())
 162       dc.SetFont(GetFont());
 163
 164   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
 165
 166   // add space at the end of the menu for the submenu expansion arrow
 167   // this will also allow offsetting the accel string from the right edge
 168   *pwidth += GetDefaultMarginWidth() + 16;
 169
 170   // increase size to accommodate bigger bitmaps if necessary
 171   if (m_bmpChecked.Ok())
 172   {
 173       // Is BMP height larger then text height?
 174       size_t adjustedHeight = m_bmpChecked.GetHeight() +
 175                                 2*wxSystemSettings::GetMetric(wxSYS_EDGE_Y);
 176       if (*pheight < adjustedHeight)
 177           *pheight = adjustedHeight;
 178
 179       // Does BMP encroach on default check menu position?
 180       size_t adjustedWidth = m_bmpChecked.GetWidth();
 181
 182       // Do we need to widen margin to fit BMP?
 183       if ((size_t)GetMarginWidth() < adjustedWidth)
 184           SetMarginWidth(adjustedWidth);
 185   }
 186
 187   // make sure that this item is at least as
 188   // tall as the user's system settings specify
 189   if (*pheight < m_nMinHeight)
 190     *pheight = m_nMinHeight;
 191
 192   // remember height for use in OnDrawItem
 193   m_nHeight = *pheight;
 194
 195   return true;
 196 }
 197
 198 // draw the item
 199 bool wxOwnerDrawn::OnDrawItem(wxDC& dc,
 200                               const wxRect& rc,
 201                               wxODAction act,
 202                               wxODStatus st)
 203 {
 204   // we do nothing on focus change
 205   if ( act == wxODFocusChanged )
 206     return true;
 207
 208
 209   // this flag determines whether or not an edge will
 210   // be drawn around the bitmap. In most "windows classic"
 211   // applications, a 1-pixel highlight edge is drawn around
 212   // the bitmap of an item when it is selected.  However,
 213   // with the new "luna" theme, no edge is drawn around
 214   // the bitmap because the background is white (this applies
 215   // only to "non-XP style" menus w/ bitmaps --
 216   // see IE 6 menus for an example)
 217
 218   bool draw_bitmap_edge = true;
 219
 220   // set the colors
 221   // --------------
 222   DWORD colBack, colText;
 223   if ( st & wxODSelected ) {
 224     colBack = GetSysColor(COLOR_HIGHLIGHT);
 225     if (!(st & wxODDisabled))
 226     {
 227         colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 228     }
 229      else
 230     {
 231         colText = GetSysColor(COLOR_GRAYTEXT);
 232     }
 233   }
 234   else {
 235     // fall back to default colors if none explicitly specified
 236     colBack = m_colBack.Ok() ? wxColourToPalRGB(m_colBack)
 237                              : GetSysColor(COLOR_WINDOW);
 238     colText = m_colText.Ok() ? wxColourToPalRGB(m_colText)
 239                              : GetSysColor(COLOR_WINDOWTEXT);
 240   }
 241
 242
 243   // don't draw an edge around the bitmap, if background is white ...
 244   DWORD menu_bg_color = GetSysColor(COLOR_MENU);
 245   if (    ( GetRValue( menu_bg_color ) >= 0xf0 &&
 246             GetGValue( menu_bg_color ) >= 0xf0 &&
 247             GetBValue( menu_bg_color ) >= 0xf0 )
 248        // ... or if the menu item is disabled
 249        || ( st & wxODDisabled )
 250     )
 251   {
 252       draw_bitmap_edge = false;
 253   }
 254
 255
 256   HDC hdc = GetHdcOf(dc);
 257   COLORREF colOldText = ::SetTextColor(hdc, colText),
 258            colOldBack = ::SetBkColor(hdc, colBack);
 259
 260   int margin = GetMarginWidth() + wxSystemSettings::GetMetric(wxSYS_EDGE_X);
 261
 262   // select the font and draw the text
 263   // ---------------------------------
 264
 265
 266   // determine where to draw and leave space for a check-mark.
 267   int xText = rc.x + margin;
 268
 269
 270   // using native API because it reckognizes '&'
 271   int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 272   HBRUSH hbr = CreateSolidBrush(colBack),
 273          hPrevBrush = (HBRUSH)SelectObject(hdc, hbr);
 274
 275   RECT rectFill = { rc.GetLeft(), rc.GetTop(),
 276                       rc.GetRight() + 1, rc.GetBottom() + 1 };
 277
 278   if ( (st & wxODSelected) && m_bmpChecked.Ok() ) {
 279       // only draw the highlight under the text, not under
 280       // the bitmap or checkmark
 281       rectFill.left = xText;
 282   }
 283
 284   FillRect(hdc, &rectFill, hbr);
 285
 286   // use default font if no font set
 287   HFONT hfont;
 288   if ( m_font.Ok() ) {
 289     m_font.RealizeResource();
 290     hfont = (HFONT)m_font.GetResourceHandle();
 291   }
 292   else {
 293     hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 294   }
 295
 296   HFONT hPrevFont = (HFONT) ::SelectObject(hdc, hfont);
 297
 298   wxString strMenuText = m_strName.BeforeFirst('\t');
 299
 300   SIZE sizeRect;
 301   GetTextExtentPoint32(hdc,strMenuText.c_str(), strMenuText.Length(),&sizeRect);
 302   ::DrawState(hdc, NULL, NULL,
 303               (LPARAM)strMenuText.c_str(), strMenuText.length(),
 304               xText, rc.y+( (int) ((rc.GetHeight()-sizeRect.cy)/2.0) )-1, // centre text vertically
 305               rc.GetWidth()-margin, sizeRect.cy,
 306               DST_PREFIXTEXT |
 307               (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0));
 308
 309   // ::SetTextAlign(hdc, TA_RIGHT) doesn't work with DSS_DISABLED or DSS_MONO
 310   // as last parameter in DrawState() (at least with Windows98). So we have
 311   // to take care of right alignment ourselves.
 312   if ( !m_strAccel.empty() )
 313   {
 314       int accel_width, accel_height;
 315       dc.GetTextExtent(m_strAccel, &accel_width, &accel_height);
 316       // right align accel string with right edge of menu ( offset by the
 317       // margin width )
 318       ::DrawState(hdc, NULL, NULL,
 319               (LPARAM)m_strAccel.c_str(), m_strAccel.length(),
 320               rc.GetWidth()-margin-accel_width, rc.y+(int) ((rc.GetHeight()-sizeRect.cy)/2.0),
 321               rc.GetWidth()-margin-accel_width, sizeRect.cy,
 322               DST_TEXT |
 323               (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0));
 324   }
 325
 326   (void)SelectObject(hdc, hPrevBrush);
 327   (void)SelectObject(hdc, hPrevFont);
 328   (void)SetBkMode(hdc, nPrevMode);
 329
 330   DeleteObject(hbr);
 331
 332   // draw the bitmap
 333   // ---------------
 334   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 335     if ( st & wxODChecked ) {
 336       // what goes on: DrawFrameControl creates a b/w mask,
 337       // then we copy it to screen to have right colors
 338
 339         // first create a monochrome bitmap in a memory DC
 340       HDC hdcMem = CreateCompatibleDC(hdc);
 341       HBITMAP hbmpCheck = CreateBitmap(margin, m_nHeight, 1, 1, 0);
 342       SelectObject(hdcMem, hbmpCheck);
 343
 344         // then draw a check mark into it
 345       RECT rect = { 0, 0, margin, m_nHeight };
 346       if ( m_nHeight > 0 )
 347       {
 348         ::DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 349       }
 350
 351         // finally copy it to screen DC and clean up
 352       BitBlt(hdc, rc.x, rc.y, margin, m_nHeight,
 353              hdcMem, 0, 0, SRCCOPY);
 354
 355       DeleteDC(hdcMem);
 356       DeleteObject(hbmpCheck);
 357     }
 358   }
 359   else {
 360     wxBitmap bmp;
 361
 362     if ( st & wxODDisabled )
 363     {
 364         bmp = GetDisabledBitmap();
 365     }
 366
 367     if ( !bmp.Ok() )
 368     {
 369         // for not checkable bitmaps we should always use unchecked one because
 370         // their checked bitmap is not set
 371         bmp = GetBitmap(!IsCheckable() || (st & wxODChecked));
 372     }
 373
 374     if ( bmp.Ok() ) {
 375       wxMemoryDC dcMem(&dc);
 376       dcMem.SelectObject(bmp);
 377
 378       // center bitmap
 379       int nBmpWidth = bmp.GetWidth(),
 380           nBmpHeight = bmp.GetHeight();
 381
 382       // there should be enough place!
 383       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 384
 385       int heightDiff = m_nHeight - nBmpHeight;
 386       dc.Blit(rc.x + (margin - nBmpWidth) / 2,
 387               rc.y + heightDiff / 2,
 388               nBmpWidth, nBmpHeight,
 389               &dcMem, 0, 0, wxCOPY, true /* use mask */);
 390
 391       if ( st & wxODSelected && draw_bitmap_edge ) {
 392           RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 393                            rc.GetLeft() + margin,
 394                            rc.GetTop() + m_nHeight };
 395           SetBkColor(hdc, colBack);
 396
 397           DrawEdge(hdc, &rectBmp, BDR_RAISEDOUTER, BF_SOFT | BF_RECT);
 398       }
 399     }
 400   }
 401
 402   ::SetTextColor(hdc, colOldText);
 403   ::SetBkColor(hdc, colOldBack);
 404
 405   return true;
 406 }
 407
 408
 409 #endif // wxUSE_OWNER_DRAWN
 410