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/image.h"
  25     #include "wx/dcmemory.h"
  26     #include "wx/menu.h"
  27     #include "wx/utils.h"
  28     #include "wx/settings.h"
  29     #include "wx/menuitem.h"
  30     #include "wx/module.h"
  31 #endif
  32
  33 #include "wx/ownerdrw.h"
  34 #include "wx/fontutil.h"
  35
  36 #if wxUSE_OWNER_DRAWN
  37
  38 #ifndef SPI_GETKEYBOARDCUES
  39 #define SPI_GETKEYBOARDCUES 0x100A
  40 #endif
  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
  63         if (SystemParametersInfo(SPI_GETKEYBOARDCUES, 0, &ms_showCues, 0) == 0)
  64             ms_showCues = true;
  65 #endif
  66
  67         return true;
  68     }
  69
  70     virtual void OnExit()
  71     {
  72         delete ms_systemMenuFont;
  73         ms_systemMenuFont = NULL;
  74     }
  75
  76     static wxFont* ms_systemMenuFont;
  77     static int ms_systemMenuButtonWidth;   // windows clean install default
  78     static int ms_systemMenuHeight;        // windows clean install default
  79     static bool ms_showCues;
  80 private:
  81     DECLARE_DYNAMIC_CLASS(wxMSWSystemMenuFontModule)
  82 };
  83
  84 // these static variables are from the wxMSWSystemMenuFontModule object
  85 // and reflect the system settings returned by the Win32 API's
  86 // SystemParametersInfo() call.
  87
  88 wxFont* wxMSWSystemMenuFontModule::ms_systemMenuFont = NULL;
  89 int wxMSWSystemMenuFontModule::ms_systemMenuButtonWidth = 18;   // windows clean install default
  90 int wxMSWSystemMenuFontModule::ms_systemMenuHeight = 18;        // windows clean install default
  91 bool wxMSWSystemMenuFontModule::ms_showCues = true;
  92
  93 IMPLEMENT_DYNAMIC_CLASS(wxMSWSystemMenuFontModule, wxModule)
  94
  95
  96 // VC++ 6 gives a warning here:
  97 //
  98 //      return type for 'OwnerDrawnSet_wxImplementation_HashTable::iterator::
  99 //      operator ->' is 'class wxOwnerDrawn ** ' (ie; not a UDT or reference to
 100 //      a UDT.  Will produce errors if applied using infix notation.
 101 //
 102 // shut it down
 103 #if defined __VISUALC__ && __VISUALC__ <= 1300
 104     #if __VISUALC__ >= 1200
 105         #pragma warning(push)
 106         #define POP_WARNINGS
 107     #endif
 108     #pragma warning(disable: 4284)
 109 #endif
 110
 111 #include "wx/hashset.h"
 112 WX_DECLARE_HASH_SET(wxOwnerDrawn*, wxPointerHash, wxPointerEqual, OwnerDrawnSet);
 113
 114 #ifdef POP_WARNINGS
 115     #pragma warning(pop)
 116 #endif
 117
 118 // ============================================================================
 119 // implementation of wxOwnerDrawn class
 120 // ============================================================================
 121
 122 // ctor
 123 // ----
 124 wxOwnerDrawn::wxOwnerDrawn(const wxString& str,
 125                            bool bCheckable,
 126                            bool bMenuItem)
 127             : m_strName(str)
 128 {
 129     if ( ms_nDefaultMarginWidth == 0 )
 130     {
 131        ms_nDefaultMarginWidth = ::GetSystemMetrics(SM_CXMENUCHECK) +
 132                                 wxSystemSettings::GetMetric(wxSYS_EDGE_X);
 133        ms_nLastMarginWidth = ms_nDefaultMarginWidth;
 134     }
 135
 136     m_bCheckable   = bCheckable;
 137     m_bOwnerDrawn  = false;
 138     m_isMenuItem   = bMenuItem;
 139     m_nHeight      = 0;
 140     m_nMarginWidth = ms_nLastMarginWidth;
 141     m_nMinHeight   = wxMSWSystemMenuFontModule::ms_systemMenuHeight;
 142 }
 143
 144 wxOwnerDrawn::~wxOwnerDrawn()
 145 {
 146 }
 147
 148 bool wxOwnerDrawn::IsMenuItem() const
 149 {
 150     return m_isMenuItem;
 151 }
 152
 153
 154 // these items will be set during the first invocation of the c'tor,
 155 // because the values will be determined by checking the system settings,
 156 // which is a chunk of code
 157 size_t wxOwnerDrawn::ms_nDefaultMarginWidth = 0;
 158 size_t wxOwnerDrawn::ms_nLastMarginWidth = 0;
 159
 160
 161 // drawing
 162 // -------
 163
 164 wxFont wxOwnerDrawn::GetFontToUse() const
 165 {
 166     wxFont font = m_font;
 167     if ( !font.Ok() )
 168     {
 169         if ( IsMenuItem() )
 170             font = *wxMSWSystemMenuFontModule::ms_systemMenuFont;
 171
 172         if ( !font.Ok() )
 173             font = *wxNORMAL_FONT;
 174     }
 175
 176     return font;
 177 }
 178
 179 // get size of the item
 180 // The item size includes the menu string, the accel string,
 181 // the bitmap and size for a submenu expansion arrow...
 182 bool wxOwnerDrawn::OnMeasureItem(size_t *pwidth, size_t *pheight)
 183 {
 184     if ( IsOwnerDrawn() )
 185     {
 186         wxMemoryDC dc;
 187
 188         wxString str = wxStripMenuCodes(m_strName);
 189
 190         // if we have a valid accel string, then pad out
 191         // the menu string so that the menu and accel string are not
 192         // placed on top of each other.
 193         if ( !m_strAccel.empty() )
 194         {
 195             str.Pad(str.length()%8);
 196             str += m_strAccel;
 197         }
 198
 199         dc.SetFont(GetFontToUse());
 200
 201         wxCoord w, h;
 202         dc.GetTextExtent(str, &w, &h);
 203         *pwidth = w;
 204         *pheight = h;
 205
 206         // add space at the end of the menu for the submenu expansion arrow
 207         // this will also allow offsetting the accel string from the right edge
 208         *pwidth += GetMarginWidth() + 16;
 209     }
 210     else // don't draw the text, just the bitmap (if any)
 211     {
 212         *pwidth =
 213         *pheight = 0;
 214     }
 215
 216     // increase size to accommodate bigger bitmaps if necessary
 217     if (m_bmpChecked.Ok())
 218     {
 219         // Is BMP height larger then text height?
 220         size_t adjustedHeight = m_bmpChecked.GetHeight() +
 221                                   2*wxSystemSettings::GetMetric(wxSYS_EDGE_Y);
 222         if (*pheight < adjustedHeight)
 223             *pheight = adjustedHeight;
 224
 225         const size_t widthBmp = m_bmpChecked.GetWidth();
 226         if ( IsOwnerDrawn() )
 227         {
 228             // widen the margin to fit the bitmap if necessary
 229             if ((size_t)GetMarginWidth() < widthBmp)
 230                 SetMarginWidth(widthBmp);
 231         }
 232         else // we must allocate enough space for the bitmap
 233         {
 234             *pwidth += widthBmp;
 235         }
 236     }
 237
 238     // add a 4-pixel separator, otherwise menus look cluttered
 239     *pwidth += 4;
 240
 241     // make sure that this item is at least as tall as the system menu height
 242     if ( *pheight < m_nMinHeight )
 243       *pheight = m_nMinHeight;
 244
 245     // remember height for use in OnDrawItem
 246     m_nHeight = *pheight;
 247
 248     return true;
 249 }
 250
 251 // draw the item
 252 bool wxOwnerDrawn::OnDrawItem(wxDC& dc,
 253                               const wxRect& rc,
 254                               wxODAction act,
 255                               wxODStatus st)
 256 {
 257     // we do nothing on focus change
 258     if ( act == wxODFocusChanged )
 259         return true;
 260
 261
 262     // this flag determines whether or not an edge will
 263     // be drawn around the bitmap. In most "windows classic"
 264     // applications, a 1-pixel highlight edge is drawn around
 265     // the bitmap of an item when it is selected.  However,
 266     // with the new "luna" theme, no edge is drawn around
 267     // the bitmap because the background is white (this applies
 268     // only to "non-XP style" menus w/ bitmaps --
 269     // see IE 6 menus for an example)
 270
 271     bool draw_bitmap_edge = true;
 272
 273     // set the colors
 274     // --------------
 275     DWORD colBack, colText;
 276     if ( st & wxODSelected )
 277     {
 278         colBack = GetSysColor(COLOR_HIGHLIGHT);
 279         if (!(st & wxODDisabled))
 280         {
 281             colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 282         }
 283         else
 284         {
 285             colText = GetSysColor(COLOR_GRAYTEXT);
 286         }
 287     }
 288     else
 289     {
 290         // fall back to default colors if none explicitly specified
 291         colBack = m_colBack.Ok() ? wxColourToPalRGB(m_colBack)
 292                                  : GetSysColor(COLOR_MENU);
 293         colText = m_colText.Ok() ? wxColourToPalRGB(m_colText)
 294                                  : GetSysColor(COLOR_MENUTEXT);
 295     }
 296
 297     if ( IsOwnerDrawn() )
 298     {
 299         // don't draw an edge around the bitmap, if background is white ...
 300         DWORD menu_bg_color = GetSysColor(COLOR_MENU);
 301         if (    ( GetRValue( menu_bg_color ) >= 0xf0 &&
 302                   GetGValue( menu_bg_color ) >= 0xf0 &&
 303                   GetBValue( menu_bg_color ) >= 0xf0 )
 304           )
 305         {
 306             draw_bitmap_edge = false;
 307         }
 308     }
 309     else // edge doesn't look well with default Windows drawing
 310     {
 311         draw_bitmap_edge = false;
 312     }
 313
 314
 315     HDC hdc = GetHdcOf(dc);
 316     COLORREF colOldText = ::SetTextColor(hdc, colText),
 317              colOldBack = ::SetBkColor(hdc, colBack);
 318
 319     // *2, as in wxSYS_EDGE_Y
 320     int margin = GetMarginWidth() + 2 * wxSystemSettings::GetMetric(wxSYS_EDGE_X);
 321
 322     // select the font and draw the text
 323     // ---------------------------------
 324
 325
 326     // determine where to draw and leave space for a check-mark.
 327     // + 1 pixel to separate the edge from the highlight rectangle
 328     int xText = rc.x + margin + 1;
 329
 330
 331     // using native API because it recognizes '&'
 332     if ( IsOwnerDrawn() )
 333     {
 334         int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 335         AutoHBRUSH hbr(colBack);
 336         SelectInHDC selBrush(hdc, hbr);
 337
 338         RECT rectFill = { rc.GetLeft(), rc.GetTop(),
 339                             rc.GetRight() + 1, rc.GetBottom() + 1 };
 340
 341         if ( (st & wxODSelected) && m_bmpChecked.Ok() && draw_bitmap_edge )
 342         {
 343             // only draw the highlight under the text, not under
 344             // the bitmap or checkmark
 345             rectFill.left = xText;
 346         }
 347
 348         FillRect(hdc, &rectFill, hbr);
 349
 350         // use default font if no font set
 351         wxFont fontToUse = GetFontToUse();
 352         SelectInHDC selFont(hdc, GetHfontOf(fontToUse));
 353
 354         wxString strMenuText = m_strName.BeforeFirst('\t');
 355
 356         xText += 3; // separate text from the highlight rectangle
 357
 358         SIZE sizeRect;
 359         ::GetTextExtentPoint32(hdc, strMenuText.c_str(), strMenuText.length(), &sizeRect);
 360         ::DrawState(hdc, NULL, NULL,
 361                     (LPARAM)strMenuText.wx_str(),
 362                     strMenuText.length(),
 363                     xText, rc.y + (int) ((rc.GetHeight()-sizeRect.cy)/2.0), // centre text vertically
 364                     rc.GetWidth()-margin, sizeRect.cy,
 365                     DST_PREFIXTEXT |
 366                     (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0) |
 367                     (((st & wxODHidePrefix) && !wxMSWSystemMenuFontModule::ms_showCues) ? 512 : 0)); // 512 == DSS_HIDEPREFIX
 368
 369         // ::SetTextAlign(hdc, TA_RIGHT) doesn't work with DSS_DISABLED or DSS_MONO
 370         // as the last parameter in DrawState() (at least with Windows98). So we have
 371         // to take care of right alignment ourselves.
 372         if ( !m_strAccel.empty() )
 373         {
 374             int accel_width, accel_height;
 375             dc.GetTextExtent(m_strAccel, &accel_width, &accel_height);
 376             // right align accel string with right edge of menu ( offset by the
 377             // margin width )
 378             ::DrawState(hdc, NULL, NULL,
 379                     (LPARAM)m_strAccel.wx_str(),
 380                     m_strAccel.length(),
 381                     rc.GetWidth()-16-accel_width, rc.y+(int) ((rc.GetHeight()-sizeRect.cy)/2.0),
 382                     0, 0,
 383                     DST_TEXT |
 384                     (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0));
 385         }
 386
 387         (void)SetBkMode(hdc, nPrevMode);
 388     }
 389
 390
 391     // draw the bitmap
 392     // ---------------
 393     if ( IsCheckable() && !m_bmpChecked.Ok() )
 394     {
 395         if ( st & wxODChecked )
 396         {
 397             // what goes on: DrawFrameControl creates a b/w mask,
 398             // then we copy it to screen to have right colors
 399
 400             // first create a monochrome bitmap in a memory DC
 401             HDC hdcMem = CreateCompatibleDC(hdc);
 402             HBITMAP hbmpCheck = CreateBitmap(margin, m_nHeight, 1, 1, 0);
 403             SelectObject(hdcMem, hbmpCheck);
 404
 405             // then draw a check mark into it
 406             RECT rect = { 0, 0, margin, m_nHeight };
 407             if ( m_nHeight > 0 )
 408             {
 409                 ::DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 410             }
 411
 412             // finally copy it to screen DC and clean up
 413             BitBlt(hdc, rc.x, rc.y, margin, m_nHeight, hdcMem, 0, 0, SRCCOPY);
 414
 415             DeleteDC(hdcMem);
 416             DeleteObject(hbmpCheck);
 417         }
 418     }
 419     else
 420     {
 421         wxBitmap bmp;
 422
 423         if ( st & wxODDisabled )
 424         {
 425             bmp = GetDisabledBitmap();
 426         }
 427
 428         if ( !bmp.Ok() )
 429         {
 430             // for not checkable bitmaps we should always use unchecked one
 431             // because their checked bitmap is not set
 432             bmp = GetBitmap(!IsCheckable() || (st & wxODChecked));
 433
 434 #if wxUSE_IMAGE
 435             if ( bmp.Ok() && st & wxODDisabled )
 436             {
 437                 // we need to grey out the bitmap as we don't have any specific
 438                 // disabled bitmap
 439                 wxImage imgGrey = bmp.ConvertToImage().ConvertToGreyscale();
 440                 if ( imgGrey.Ok() )
 441                     bmp = wxBitmap(imgGrey);
 442             }
 443 #endif // wxUSE_IMAGE
 444         }
 445
 446         if ( bmp.Ok() )
 447         {
 448             wxMemoryDC dcMem(&dc);
 449             dcMem.SelectObjectAsSource(bmp);
 450
 451             // center bitmap
 452             int nBmpWidth = bmp.GetWidth(),
 453                 nBmpHeight = bmp.GetHeight();
 454
 455             // there should be enough space!
 456             wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 457
 458             int heightDiff = m_nHeight - nBmpHeight;
 459             dc.Blit(rc.x + (margin - nBmpWidth) / 2,
 460                     rc.y + heightDiff / 2,
 461                     nBmpWidth, nBmpHeight,
 462                     &dcMem, 0, 0, wxCOPY, true /* use mask */);
 463
 464             if ( ( st & wxODSelected ) && !( st & wxODDisabled ) && draw_bitmap_edge )
 465             {
 466                 RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 467                                  rc.GetLeft() + margin,
 468                                  rc.GetTop() + m_nHeight };
 469                 SetBkColor(hdc, colBack);
 470
 471                 DrawEdge(hdc, &rectBmp, BDR_RAISEDINNER, BF_RECT);
 472             }
 473         }
 474     }
 475
 476     ::SetTextColor(hdc, colOldText);
 477     ::SetBkColor(hdc, colOldBack);
 478
 479     return true;
 480 }
 481
 482
 483 #endif // wxUSE_OWNER_DRAWN