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 #ifndef SPI_GETKEYBOARDCUES
  43 #define SPI_GETKEYBOARDCUES 0x100A
  44 #endif
  45
  46 class wxMSWSystemMenuFontModule : public wxModule
  47 {
  48 public:
  49
  50     virtual bool OnInit()
  51     {
  52         ms_systemMenuFont = new wxFont;
  53
  54 #if defined(__WXMSW__) && defined(__WIN32__) && defined(SM_CXMENUCHECK)
  55         NONCLIENTMETRICS nm;
  56         nm.cbSize = sizeof(NONCLIENTMETRICS);
  57         SystemParametersInfo(SPI_GETNONCLIENTMETRICS,0,&nm,0);
  58
  59         ms_systemMenuButtonWidth = nm.iMenuHeight;
  60         ms_systemMenuHeight = nm.iMenuHeight;
  61
  62         // create menu font
  63         wxNativeFontInfo info;
  64         memcpy(&info.lf, &nm.lfMenuFont, sizeof(LOGFONT));
  65         ms_systemMenuFont->Create(info);
  66
  67         if (SystemParametersInfo(SPI_GETKEYBOARDCUES, 0, &ms_showCues, 0) == 0)
  68             ms_showCues = true;
  69 #endif
  70
  71         return true;
  72     }
  73
  74     virtual void OnExit()
  75     {
  76         delete ms_systemMenuFont;
  77         ms_systemMenuFont = NULL;
  78     }
  79
  80     static wxFont* ms_systemMenuFont;
  81     static int ms_systemMenuButtonWidth;   // windows clean install default
  82     static int ms_systemMenuHeight;        // windows clean install default
  83     static bool ms_showCues;
  84 private:
  85     DECLARE_DYNAMIC_CLASS(wxMSWSystemMenuFontModule)
  86 };
  87
  88 // these static variables are by the wxMSWSystemMenuFontModule object
  89 // and reflect the system settings returned by the Win32 API's
  90 // SystemParametersInfo() call.
  91
  92 wxFont* wxMSWSystemMenuFontModule::ms_systemMenuFont = NULL;
  93 int wxMSWSystemMenuFontModule::ms_systemMenuButtonWidth = 18;   // windows clean install default
  94 int wxMSWSystemMenuFontModule::ms_systemMenuHeight = 18;        // windows clean install default
  95 bool wxMSWSystemMenuFontModule::ms_showCues = true;
  96
  97 IMPLEMENT_DYNAMIC_CLASS(wxMSWSystemMenuFontModule, wxModule)
  98
  99 // ============================================================================
 100 // implementation of wxOwnerDrawn class
 101 // ============================================================================
 102
 103 // ctor
 104 // ----
 105 wxOwnerDrawn::wxOwnerDrawn(const wxString& str,
 106                            bool bCheckable, bool bMenuItem)
 107             : m_strName(str)
 108 {
 109     // get the default menu height and font from the system
 110     NONCLIENTMETRICS nm;
 111     nm.cbSize = sizeof (NONCLIENTMETRICS);
 112     SystemParametersInfo (SPI_GETNONCLIENTMETRICS,0,&nm,0);
 113     m_nMinHeight = nm.iMenuHeight;
 114
 115     // nm.iMenuWidth is the system default for the width of
 116     // menu icons and checkmarks
 117     if (ms_nDefaultMarginWidth == 0)
 118     {
 119        ms_nDefaultMarginWidth = ::GetSystemMetrics(SM_CXMENUCHECK) + wxSystemSettings::GetMetric(wxSYS_EDGE_X);
 120        ms_nLastMarginWidth = ms_nDefaultMarginWidth;
 121     }
 122
 123     if (wxMSWSystemMenuFontModule::ms_systemMenuFont->Ok() && bMenuItem)
 124     {
 125         m_font = *wxMSWSystemMenuFontModule::ms_systemMenuFont;
 126     }
 127     else
 128     {
 129         m_font = *wxNORMAL_FONT;
 130     }
 131
 132     m_bCheckable   = bCheckable;
 133     m_bOwnerDrawn  = false;
 134     m_nHeight      = 0;
 135     m_nMarginWidth = ms_nLastMarginWidth;
 136     m_nMinHeight   = wxMSWSystemMenuFontModule::ms_systemMenuHeight;
 137
 138     m_bmpDisabled = wxNullBitmap;
 139 }
 140
 141
 142 // these items will be set during the first invocation of the c'tor,
 143 // because the values will be determined by checking the system settings,
 144 // which is a chunk of code
 145 size_t wxOwnerDrawn::ms_nDefaultMarginWidth = 0;
 146 size_t wxOwnerDrawn::ms_nLastMarginWidth = 0;
 147
 148
 149 // drawing
 150 // -------
 151
 152 // get size of the item
 153 // The item size includes the menu string, the accel string,
 154 // the bitmap and size for a submenu expansion arrow...
 155 bool wxOwnerDrawn::OnMeasureItem(size_t *pwidth, size_t *pheight)
 156 {
 157   wxMemoryDC dc;
 158
 159   wxString str = wxStripMenuCodes(m_strName);
 160
 161   // if we have a valid accel string, then pad out
 162   // the menu string so the menu and accel string are not
 163   // placed ontop of eachother.
 164   if ( !m_strAccel.empty() )
 165    {
 166        str.Pad(str.Length()%8);
 167        str += m_strAccel;
 168    }
 169
 170   if (m_font.Ok())
 171       dc.SetFont(GetFont());
 172
 173   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
 174
 175   // increase size to accommodate bigger bitmaps if necessary
 176   if (m_bmpChecked.Ok())
 177   {
 178       // Is BMP height larger then text height?
 179       size_t adjustedHeight = m_bmpChecked.GetHeight() +
 180                                 2*wxSystemSettings::GetMetric(wxSYS_EDGE_Y);
 181       if (*pheight < adjustedHeight)
 182           *pheight = adjustedHeight;
 183
 184       // Does BMP encroach on default check menu position?
 185       size_t adjustedWidth = m_bmpChecked.GetWidth();
 186
 187       // Do we need to widen margin to fit BMP?
 188       if ((size_t)GetMarginWidth() < adjustedWidth)
 189           SetMarginWidth(adjustedWidth);
 190   }
 191
 192   // add space at the end of the menu for the submenu expansion arrow
 193   // this will also allow offsetting the accel string from the right edge
 194   *pwidth += GetMarginWidth() + 16;
 195
 196   // add a 4-pixel separator, otherwise menus look cluttered
 197   *pwidth += 4;
 198
 199   // make sure that this item is at least as
 200   // tall as the user's system settings specify
 201   if (*pheight < m_nMinHeight)
 202     *pheight = m_nMinHeight;
 203
 204   // remember height for use in OnDrawItem
 205   m_nHeight = *pheight;
 206
 207   return true;
 208 }
 209
 210 // draw the item
 211 bool wxOwnerDrawn::OnDrawItem(wxDC& dc,
 212                               const wxRect& rc,
 213                               wxODAction act,
 214                               wxODStatus st)
 215 {
 216   // we do nothing on focus change
 217   if ( act == wxODFocusChanged )
 218     return true;
 219
 220
 221   // this flag determines whether or not an edge will
 222   // be drawn around the bitmap. In most "windows classic"
 223   // applications, a 1-pixel highlight edge is drawn around
 224   // the bitmap of an item when it is selected.  However,
 225   // with the new "luna" theme, no edge is drawn around
 226   // the bitmap because the background is white (this applies
 227   // only to "non-XP style" menus w/ bitmaps --
 228   // see IE 6 menus for an example)
 229
 230   bool draw_bitmap_edge = true;
 231
 232   // set the colors
 233   // --------------
 234   DWORD colBack, colText;
 235   if ( st & wxODSelected ) {
 236     colBack = GetSysColor(COLOR_HIGHLIGHT);
 237     if (!(st & wxODDisabled))
 238     {
 239         colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 240     }
 241      else
 242     {
 243         colText = GetSysColor(COLOR_GRAYTEXT);
 244     }
 245   }
 246   else {
 247     // fall back to default colors if none explicitly specified
 248     colBack = m_colBack.Ok() ? wxColourToPalRGB(m_colBack)
 249                              : GetSysColor(COLOR_MENU);
 250     colText = m_colText.Ok() ? wxColourToPalRGB(m_colText)
 251                              : GetSysColor(COLOR_MENUTEXT);
 252   }
 253
 254
 255   // don't draw an edge around the bitmap, if background is white ...
 256   DWORD menu_bg_color = GetSysColor(COLOR_MENU);
 257   if (    ( GetRValue( menu_bg_color ) >= 0xf0 &&
 258             GetGValue( menu_bg_color ) >= 0xf0 &&
 259             GetBValue( menu_bg_color ) >= 0xf0 )
 260     )
 261   {
 262       draw_bitmap_edge = false;
 263   }
 264
 265
 266   HDC hdc = GetHdcOf(dc);
 267   COLORREF colOldText = ::SetTextColor(hdc, colText),
 268            colOldBack = ::SetBkColor(hdc, colBack);
 269
 270   // *2, as in wxSYS_EDGE_Y
 271   int margin = GetMarginWidth() + 2 * wxSystemSettings::GetMetric(wxSYS_EDGE_X);
 272
 273   // select the font and draw the text
 274   // ---------------------------------
 275
 276
 277   // determine where to draw and leave space for a check-mark.
 278   // + 1 pixel to separate the edge from the highlight rectangle
 279   int xText = rc.x + margin + 1;
 280
 281
 282   // using native API because it reckognizes '&'
 283   int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 284   HBRUSH hbr = CreateSolidBrush(colBack),
 285          hPrevBrush = (HBRUSH)SelectObject(hdc, hbr);
 286
 287   RECT rectFill = { rc.GetLeft(), rc.GetTop(),
 288                       rc.GetRight() + 1, rc.GetBottom() + 1 };
 289
 290   if ( (st & wxODSelected) && m_bmpChecked.Ok() && draw_bitmap_edge ) {
 291       // only draw the highlight under the text, not under
 292       // the bitmap or checkmark
 293       rectFill.left = xText;
 294   }
 295
 296   FillRect(hdc, &rectFill, hbr);
 297
 298   // use default font if no font set
 299   HFONT hfont;
 300   if ( m_font.Ok() ) {
 301     m_font.RealizeResource();
 302     hfont = (HFONT)m_font.GetResourceHandle();
 303   }
 304   else {
 305     hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 306   }
 307
 308   HFONT hPrevFont = (HFONT) ::SelectObject(hdc, hfont);
 309
 310   wxString strMenuText = m_strName.BeforeFirst('\t');
 311
 312   xText += 3; // separate text from the highlight rectangle
 313
 314   SIZE sizeRect;
 315   GetTextExtentPoint32(hdc,strMenuText.c_str(), strMenuText.Length(),&sizeRect);
 316   ::DrawState(hdc, NULL, NULL,
 317               (LPARAM)strMenuText.c_str(), strMenuText.length(),
 318               xText, rc.y + (int) ((rc.GetHeight()-sizeRect.cy)/2.0), // centre text vertically
 319               rc.GetWidth()-margin, sizeRect.cy,
 320               DST_PREFIXTEXT |
 321               (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0) |
 322               (((st & wxODHidePrefix) && !wxMSWSystemMenuFontModule::ms_showCues) ? 512 : 0)); // 512 == DSS_HIDEPREFIX
 323
 324   // ::SetTextAlign(hdc, TA_RIGHT) doesn't work with DSS_DISABLED or DSS_MONO
 325   // as last parameter in DrawState() (at least with Windows98). So we have
 326   // to take care of right alignment ourselves.
 327   if ( !m_strAccel.empty() )
 328   {
 329       int accel_width, accel_height;
 330       dc.GetTextExtent(m_strAccel, &accel_width, &accel_height);
 331       // right align accel string with right edge of menu ( offset by the
 332       // margin width )
 333       ::DrawState(hdc, NULL, NULL,
 334               (LPARAM)m_strAccel.c_str(), m_strAccel.length(),
 335               rc.GetWidth()-16-accel_width, rc.y+(int) ((rc.GetHeight()-sizeRect.cy)/2.0),
 336               0, 0,
 337               DST_TEXT |
 338               (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0));
 339   }
 340
 341   (void)SelectObject(hdc, hPrevBrush);
 342   (void)SelectObject(hdc, hPrevFont);
 343   (void)SetBkMode(hdc, nPrevMode);
 344
 345   DeleteObject(hbr);
 346
 347   // draw the bitmap
 348   // ---------------
 349   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 350     if ( st & wxODChecked ) {
 351       // what goes on: DrawFrameControl creates a b/w mask,
 352       // then we copy it to screen to have right colors
 353
 354         // first create a monochrome bitmap in a memory DC
 355       HDC hdcMem = CreateCompatibleDC(hdc);
 356       HBITMAP hbmpCheck = CreateBitmap(margin, m_nHeight, 1, 1, 0);
 357       SelectObject(hdcMem, hbmpCheck);
 358
 359         // then draw a check mark into it
 360       RECT rect = { 0, 0, margin, m_nHeight };
 361       if ( m_nHeight > 0 )
 362       {
 363         ::DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 364       }
 365
 366         // finally copy it to screen DC and clean up
 367       BitBlt(hdc, rc.x, rc.y, margin, m_nHeight,
 368              hdcMem, 0, 0, SRCCOPY);
 369
 370       DeleteDC(hdcMem);
 371       DeleteObject(hbmpCheck);
 372     }
 373   }
 374   else {
 375     wxBitmap bmp;
 376
 377     if ( st & wxODDisabled )
 378     {
 379         bmp = GetDisabledBitmap();
 380     }
 381
 382     if ( !bmp.Ok() )
 383     {
 384         // for not checkable bitmaps we should always use unchecked one because
 385         // their checked bitmap is not set
 386         bmp = GetBitmap(!IsCheckable() || (st & wxODChecked));
 387     }
 388
 389     if ( bmp.Ok() ) {
 390       wxMemoryDC dcMem(&dc);
 391       dcMem.SelectObject(bmp);
 392
 393       // center bitmap
 394       int nBmpWidth = bmp.GetWidth(),
 395           nBmpHeight = bmp.GetHeight();
 396
 397       // there should be enough place!
 398       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 399
 400       int heightDiff = m_nHeight - nBmpHeight;
 401       dc.Blit(rc.x + (margin - nBmpWidth) / 2,
 402               rc.y + heightDiff / 2,
 403               nBmpWidth, nBmpHeight,
 404               &dcMem, 0, 0, wxCOPY, true /* use mask */);
 405
 406       if ( ( st & wxODSelected ) && !( st & wxODDisabled ) && draw_bitmap_edge ) {
 407           RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 408                            rc.GetLeft() + margin,
 409                            rc.GetTop() + m_nHeight };
 410           SetBkColor(hdc, colBack);
 411
 412           DrawEdge(hdc, &rectBmp, BDR_RAISEDINNER, BF_RECT);
 413       }
 414     }
 415   }
 416
 417   ::SetTextColor(hdc, colOldText);
 418   ::SetBkColor(hdc, colOldBack);
 419
 420   return true;
 421 }
 422
 423
 424 #endif // wxUSE_OWNER_DRAWN
 425