src/msw/ownerdrw.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/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 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #ifndef WX_PRECOMP
  20     #include "wx/window.h"
  21     #include "wx/msw/private.h"
  22     #include "wx/font.h"
  23     #include "wx/bitmap.h"
  24     #include "wx/dcmemory.h"
  25     #include "wx/menu.h"
  26     #include "wx/utils.h"
  27     #include "wx/settings.h"
  28     #include "wx/menuitem.h"
  29     #include "wx/module.h"
  30 #endif
  31
  32 #include "wx/ownerdrw.h"
  33 #include "wx/fontutil.h"
  34
  35 #if wxUSE_OWNER_DRAWN
  36
  37 #ifndef SPI_GETKEYBOARDCUES
  38 #define SPI_GETKEYBOARDCUES 0x100A
  39 #endif
  40
  41 class wxMSWSystemMenuFontModule : public wxModule
  42 {
  43 public:
  44
  45     virtual bool OnInit()
  46     {
  47         ms_systemMenuFont = new wxFont;
  48
  49 #if defined(__WXMSW__) && defined(__WIN32__) && defined(SM_CXMENUCHECK)
  50         NONCLIENTMETRICS nm;
  51         nm.cbSize = sizeof(NONCLIENTMETRICS);
  52         SystemParametersInfo(SPI_GETNONCLIENTMETRICS,0,&nm,0);
  53
  54         ms_systemMenuButtonWidth = nm.iMenuHeight;
  55         ms_systemMenuHeight = nm.iMenuHeight;
  56
  57         // create menu font
  58         wxNativeFontInfo info;
  59         memcpy(&info.lf, &nm.lfMenuFont, sizeof(LOGFONT));
  60         ms_systemMenuFont->Create(info);
  61
  62         if (SystemParametersInfo(SPI_GETKEYBOARDCUES, 0, &ms_showCues, 0) == 0)
  63             ms_showCues = true;
  64 #endif
  65
  66         return true;
  67     }
  68
  69     virtual void OnExit()
  70     {
  71         delete ms_systemMenuFont;
  72         ms_systemMenuFont = NULL;
  73     }
  74
  75     static wxFont* ms_systemMenuFont;
  76     static int ms_systemMenuButtonWidth;   // windows clean install default
  77     static int ms_systemMenuHeight;        // windows clean install default
  78     static bool ms_showCues;
  79 private:
  80     DECLARE_DYNAMIC_CLASS(wxMSWSystemMenuFontModule)
  81 };
  82
  83 // these static variables are from the wxMSWSystemMenuFontModule object
  84 // and reflect the system settings returned by the Win32 API's
  85 // SystemParametersInfo() call.
  86
  87 wxFont* wxMSWSystemMenuFontModule::ms_systemMenuFont = NULL;
  88 int wxMSWSystemMenuFontModule::ms_systemMenuButtonWidth = 18;   // windows clean install default
  89 int wxMSWSystemMenuFontModule::ms_systemMenuHeight = 18;        // windows clean install default
  90 bool wxMSWSystemMenuFontModule::ms_showCues = true;
  91
  92 IMPLEMENT_DYNAMIC_CLASS(wxMSWSystemMenuFontModule, wxModule)
  93
  94
  95 // VC++ 6 gives a warning here:
  96 //
  97 //      return type for 'OwnerDrawnSet_wxImplementation_HashTable::iterator::
  98 //      operator ->' is 'class wxOwnerDrawn ** ' (ie; not a UDT or reference to
  99 //      a UDT.  Will produce errors if applied using infix notation.
 100 //
 101 // shut it down
 102 #if defined __VISUALC__ && __VISUALC__ <= 1300
 103     #if __VISUALC__ >= 1200
 104         #pragma warning(push)
 105         #define POP_WARNINGS
 106     #endif
 107     #pragma warning(disable: 4284)
 108 #endif
 109
 110 #include "wx/hashset.h"
 111 WX_DECLARE_HASH_SET(wxOwnerDrawn*, wxPointerHash, wxPointerEqual, OwnerDrawnSet);
 112
 113 #ifdef POP_WARNINGS
 114     #pragma warning(pop)
 115 #endif
 116
 117 // ============================================================================
 118 // implementation of wxOwnerDrawn class
 119 // ============================================================================
 120
 121 // ctor
 122 // ----
 123 wxOwnerDrawn::wxOwnerDrawn(const wxString& str,
 124                            bool bCheckable,
 125                            bool bMenuItem)
 126             : m_strName(str)
 127 {
 128     if ( ms_nDefaultMarginWidth == 0 )
 129     {
 130        ms_nDefaultMarginWidth = ::GetSystemMetrics(SM_CXMENUCHECK) +
 131                                 wxSystemSettings::GetMetric(wxSYS_EDGE_X);
 132        ms_nLastMarginWidth = ms_nDefaultMarginWidth;
 133     }
 134
 135     m_bCheckable   = bCheckable;
 136     m_bOwnerDrawn  = false;
 137     m_isMenuItem   = bMenuItem;
 138     m_nHeight      = 0;
 139     m_nMarginWidth = ms_nLastMarginWidth;
 140     m_nMinHeight   = wxMSWSystemMenuFontModule::ms_systemMenuHeight;
 141 }
 142
 143 wxOwnerDrawn::~wxOwnerDrawn()
 144 {
 145 }
 146
 147 bool wxOwnerDrawn::IsMenuItem() const
 148 {
 149     return m_isMenuItem;
 150 }
 151
 152
 153 // these items will be set during the first invocation of the c'tor,
 154 // because the values will be determined by checking the system settings,
 155 // which is a chunk of code
 156 size_t wxOwnerDrawn::ms_nDefaultMarginWidth = 0;
 157 size_t wxOwnerDrawn::ms_nLastMarginWidth = 0;
 158
 159
 160 // drawing
 161 // -------
 162
 163 wxFont wxOwnerDrawn::GetFontToUse() const
 164 {
 165     wxFont font = m_font;
 166     if ( !font.Ok() )
 167     {
 168         if ( IsMenuItem() )
 169             font = *wxMSWSystemMenuFontModule::ms_systemMenuFont;
 170
 171         if ( !font.Ok() )
 172             font = *wxNORMAL_FONT;
 173     }
 174
 175     return font;
 176 }
 177
 178 // get size of the item
 179 // The item size includes the menu string, the accel string,
 180 // the bitmap and size for a submenu expansion arrow...
 181 bool wxOwnerDrawn::OnMeasureItem(size_t *pwidth, size_t *pheight)
 182 {
 183     if ( IsOwnerDrawn() )
 184     {
 185         wxMemoryDC dc;
 186
 187         wxString str = wxStripMenuCodes(m_strName);
 188
 189         // if we have a valid accel string, then pad out
 190         // the menu string so that the menu and accel string are not
 191         // placed on top of each other.
 192         if ( !m_strAccel.empty() )
 193         {
 194             str.Pad(str.length()%8);
 195             str += m_strAccel;
 196         }
 197
 198         dc.SetFont(GetFontToUse());
 199
 200         dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
 201
 202         // add space at the end of the menu for the submenu expansion arrow
 203         // this will also allow offsetting the accel string from the right edge
 204         *pwidth += GetMarginWidth() + 16;
 205     }
 206     else // don't draw the text, just the bitmap (if any)
 207     {
 208         *pwidth =
 209         *pheight = 0;
 210     }
 211
 212     // increase size to accommodate bigger bitmaps if necessary
 213     if (m_bmpChecked.Ok())
 214     {
 215         // Is BMP height larger then text height?
 216         size_t adjustedHeight = m_bmpChecked.GetHeight() +
 217                                   2*wxSystemSettings::GetMetric(wxSYS_EDGE_Y);
 218         if (*pheight < adjustedHeight)
 219             *pheight = adjustedHeight;
 220
 221         const size_t widthBmp = m_bmpChecked.GetWidth();
 222         if ( IsOwnerDrawn() )
 223         {
 224             // widen the margin to fit the bitmap if necessary
 225             if ((size_t)GetMarginWidth() < widthBmp)
 226                 SetMarginWidth(widthBmp);
 227         }
 228         else // we must allocate enough space for the bitmap
 229         {
 230             *pwidth += widthBmp;
 231         }
 232     }
 233
 234     // add a 4-pixel separator, otherwise menus look cluttered
 235     *pwidth += 4;
 236
 237     // make sure that this item is at least as tall as the system menu height
 238     if ( *pheight < m_nMinHeight )
 239       *pheight = m_nMinHeight;
 240
 241     // remember height for use in OnDrawItem
 242     m_nHeight = *pheight;
 243
 244     return true;
 245 }
 246
 247 // draw the item
 248 bool wxOwnerDrawn::OnDrawItem(wxDC& dc,
 249                               const wxRect& rc,
 250                               wxODAction act,
 251                               wxODStatus st)
 252 {
 253     // we do nothing on focus change
 254     if ( act == wxODFocusChanged )
 255         return true;
 256
 257
 258     // this flag determines whether or not an edge will
 259     // be drawn around the bitmap. In most "windows classic"
 260     // applications, a 1-pixel highlight edge is drawn around
 261     // the bitmap of an item when it is selected.  However,
 262     // with the new "luna" theme, no edge is drawn around
 263     // the bitmap because the background is white (this applies
 264     // only to "non-XP style" menus w/ bitmaps --
 265     // see IE 6 menus for an example)
 266
 267     bool draw_bitmap_edge = true;
 268
 269     // set the colors
 270     // --------------
 271     DWORD colBack, colText;
 272     if ( st & wxODSelected )
 273     {
 274         colBack = GetSysColor(COLOR_HIGHLIGHT);
 275         if (!(st & wxODDisabled))
 276         {
 277             colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 278         }
 279         else
 280         {
 281             colText = GetSysColor(COLOR_GRAYTEXT);
 282         }
 283     }
 284     else
 285     {
 286         // fall back to default colors if none explicitly specified
 287         colBack = m_colBack.Ok() ? wxColourToPalRGB(m_colBack)
 288                                  : GetSysColor(COLOR_MENU);
 289         colText = m_colText.Ok() ? wxColourToPalRGB(m_colText)
 290                                  : GetSysColor(COLOR_MENUTEXT);
 291     }
 292
 293     if ( IsOwnerDrawn() )
 294     {
 295         // don't draw an edge around the bitmap, if background is white ...
 296         DWORD menu_bg_color = GetSysColor(COLOR_MENU);
 297         if (    ( GetRValue( menu_bg_color ) >= 0xf0 &&
 298                   GetGValue( menu_bg_color ) >= 0xf0 &&
 299                   GetBValue( menu_bg_color ) >= 0xf0 )
 300           )
 301         {
 302             draw_bitmap_edge = false;
 303         }
 304     }
 305     else // edge doesn't look well with default Windows drawing
 306     {
 307         draw_bitmap_edge = false;
 308     }
 309
 310
 311     HDC hdc = GetHdcOf(dc);
 312     COLORREF colOldText = ::SetTextColor(hdc, colText),
 313              colOldBack = ::SetBkColor(hdc, colBack);
 314
 315     // *2, as in wxSYS_EDGE_Y
 316     int margin = GetMarginWidth() + 2 * wxSystemSettings::GetMetric(wxSYS_EDGE_X);
 317
 318     // select the font and draw the text
 319     // ---------------------------------
 320
 321
 322     // determine where to draw and leave space for a check-mark.
 323     // + 1 pixel to separate the edge from the highlight rectangle
 324     int xText = rc.x + margin + 1;
 325
 326
 327     // using native API because it recognizes '&'
 328     if ( IsOwnerDrawn() )
 329     {
 330         int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 331         AutoHBRUSH hbr(colBack);
 332         SelectInHDC selBrush(hdc, hbr);
 333
 334         RECT rectFill = { rc.GetLeft(), rc.GetTop(),
 335                             rc.GetRight() + 1, rc.GetBottom() + 1 };
 336
 337         if ( (st & wxODSelected) && m_bmpChecked.Ok() && draw_bitmap_edge )
 338         {
 339             // only draw the highlight under the text, not under
 340             // the bitmap or checkmark
 341             rectFill.left = xText;
 342         }
 343
 344         FillRect(hdc, &rectFill, hbr);
 345
 346         // use default font if no font set
 347         wxFont fontToUse = GetFontToUse();
 348         SelectInHDC selFont(hdc, GetHfontOf(fontToUse));
 349
 350         wxString strMenuText = m_strName.BeforeFirst('\t');
 351
 352         xText += 3; // separate text from the highlight rectangle
 353
 354         SIZE sizeRect;
 355         ::GetTextExtentPoint32(hdc, strMenuText.c_str(), strMenuText.length(), &sizeRect);
 356         ::DrawState(hdc, NULL, NULL,
 357                     (LPARAM)strMenuText.c_str(), strMenuText.length(),
 358                     xText, rc.y + (int) ((rc.GetHeight()-sizeRect.cy)/2.0), // centre text vertically
 359                     rc.GetWidth()-margin, sizeRect.cy,
 360                     DST_PREFIXTEXT |
 361                     (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0) |
 362                     (((st & wxODHidePrefix) && !wxMSWSystemMenuFontModule::ms_showCues) ? 512 : 0)); // 512 == DSS_HIDEPREFIX
 363
 364         // ::SetTextAlign(hdc, TA_RIGHT) doesn't work with DSS_DISABLED or DSS_MONO
 365         // as the last parameter in DrawState() (at least with Windows98). So we have
 366         // to take care of right alignment ourselves.
 367         if ( !m_strAccel.empty() )
 368         {
 369             int accel_width, accel_height;
 370             dc.GetTextExtent(m_strAccel, &accel_width, &accel_height);
 371             // right align accel string with right edge of menu ( offset by the
 372             // margin width )
 373             ::DrawState(hdc, NULL, NULL,
 374                     (LPARAM)m_strAccel.c_str(), m_strAccel.length(),
 375                     rc.GetWidth()-16-accel_width, rc.y+(int) ((rc.GetHeight()-sizeRect.cy)/2.0),
 376                     0, 0,
 377                     DST_TEXT |
 378                     (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0));
 379         }
 380
 381         (void)SetBkMode(hdc, nPrevMode);
 382     }
 383
 384
 385     // draw the bitmap
 386     // ---------------
 387     if ( IsCheckable() && !m_bmpChecked.Ok() )
 388     {
 389         if ( st & wxODChecked )
 390         {
 391             // what goes on: DrawFrameControl creates a b/w mask,
 392             // then we copy it to screen to have right colors
 393
 394             // first create a monochrome bitmap in a memory DC
 395             HDC hdcMem = CreateCompatibleDC(hdc);
 396             HBITMAP hbmpCheck = CreateBitmap(margin, m_nHeight, 1, 1, 0);
 397             SelectObject(hdcMem, hbmpCheck);
 398
 399             // then draw a check mark into it
 400             RECT rect = { 0, 0, margin, m_nHeight };
 401             if ( m_nHeight > 0 )
 402             {
 403                 ::DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 404             }
 405
 406             // finally copy it to screen DC and clean up
 407             BitBlt(hdc, rc.x, rc.y, margin, m_nHeight, hdcMem, 0, 0, SRCCOPY);
 408
 409             DeleteDC(hdcMem);
 410             DeleteObject(hbmpCheck);
 411         }
 412     }
 413     else
 414     {
 415         wxBitmap bmp;
 416
 417         if ( st & wxODDisabled )
 418         {
 419             bmp = GetDisabledBitmap();
 420         }
 421
 422         if ( !bmp.Ok() )
 423         {
 424             // for not checkable bitmaps we should always use unchecked one because
 425             // their checked bitmap is not set
 426             bmp = GetBitmap(!IsCheckable() || (st & wxODChecked));
 427         }
 428
 429         if ( bmp.Ok() )
 430         {
 431             wxMemoryDC dcMem(&dc);
 432             dcMem.SelectObject(bmp);
 433
 434             // center bitmap
 435             int nBmpWidth = bmp.GetWidth(),
 436                 nBmpHeight = bmp.GetHeight();
 437
 438             // there should be enough space!
 439             wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 440
 441             int heightDiff = m_nHeight - nBmpHeight;
 442             dc.Blit(rc.x + (margin - nBmpWidth) / 2,
 443                     rc.y + heightDiff / 2,
 444                     nBmpWidth, nBmpHeight,
 445                     &dcMem, 0, 0, wxCOPY, true /* use mask */);
 446
 447             if ( ( st & wxODSelected ) && !( st & wxODDisabled ) && draw_bitmap_edge )
 448             {
 449                 RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 450                                  rc.GetLeft() + margin,
 451                                  rc.GetTop() + m_nHeight };
 452                 SetBkColor(hdc, colBack);
 453
 454                 DrawEdge(hdc, &rectBmp, BDR_RAISEDINNER, BF_RECT);
 455             }
 456         }
 457     }
 458
 459     ::SetTextColor(hdc, colOldText);
 460     ::SetBkColor(hdc, colOldBack);
 461
 462     return true;
 463 }
 464
 465
 466 #endif // wxUSE_OWNER_DRAWN