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 #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 #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
 130
 131 // these items will be set during the first invocation of the c'tor,
 132 // because the values will be determined by checking the system settings,
 133 // which is a chunk of code
 134 size_t wxOwnerDrawn::ms_nDefaultMarginWidth = 0;
 135 size_t wxOwnerDrawn::ms_nLastMarginWidth = 0;
 136
 137
 138 // drawing
 139 // -------
 140
 141 // get size of the item
 142 // The item size includes the menu string, the accel string,
 143 // the bitmap and size for a submenu expansion arrow...
 144 bool wxOwnerDrawn::OnMeasureItem(size_t *pwidth, size_t *pheight)
 145 {
 146   wxMemoryDC dc;
 147
 148   wxString str = wxStripMenuCodes(m_strName);
 149
 150   // if we have a valid accel string, then pad out
 151   // the menu string so the menu and accel string are not
 152   // placed ontop of eachother.
 153   if ( !m_strAccel.empty() )
 154    {
 155        str.Pad(str.Length()%8);
 156        str += m_strAccel;
 157    }
 158
 159   if (m_font.Ok())
 160       dc.SetFont(GetFont());
 161
 162   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
 163
 164   if (!m_strAccel.IsEmpty())
 165   {
 166       // measure the accelerator string, and add it's width to
 167       // the total item width, plus 16 (Accelerators are right justified,
 168       // with the right edge of the text rectangle 16 pixels left of
 169       // the right edge of the menu)
 170
 171       int accel_width, accel_height;
 172       dc.GetTextExtent(m_strAccel, &accel_width, &accel_height);
 173       *pwidth += accel_width;
 174   }
 175
 176   // add space at the end of the menu for the submenu expansion arrow
 177   // this will also allow offsetting the accel string from the right edge
 178   *pwidth += (size_t) (GetDefaultMarginWidth() * 1.5);
 179
 180   // JACS: items still look too tightly packed, so adding 5 pixels.
 181   (*pheight) = (*pheight) + 5;
 182
 183   // Ray Gilbert's changes - Corrects the problem of a BMP
 184   // being placed next to text in a menu item, and the BMP does
 185   // not match the size expected by the system.  This will
 186   // resize the space so the BMP will fit.  Without this, BMPs
 187   // must be no larger or smaller than 16x16.
 188   if (m_bmpChecked.Ok())
 189   {
 190       // Is BMP height larger then text height?
 191       size_t adjustedHeight = m_bmpChecked.GetHeight() +
 192                               wxSystemSettings::GetMetric(wxSYS_EDGE_Y);
 193       if (*pheight < adjustedHeight)
 194           *pheight = adjustedHeight;
 195
 196       // Does BMP encroach on default check menu position?
 197       size_t adjustedWidth = m_bmpChecked.GetWidth() +
 198                              (wxSystemSettings::GetMetric(wxSYS_EDGE_X) * 2);
 199 //      if (ms_nDefaultMarginWidth < adjustedWidth)
 200 //          *pwidth += adjustedWidth - ms_nDefaultMarginWidth;
 201
 202       // Do we need to widen margin to fit BMP?
 203       if ((size_t)GetMarginWidth() != adjustedWidth)
 204           SetMarginWidth(adjustedWidth);
 205
 206       // add the size of the bitmap to our total size...
 207       *pwidth += GetMarginWidth();
 208   }
 209
 210   // add the size of the bitmap to our total size - even if we don't have
 211   // a bitmap we leave room for one...
 212   *pwidth += GetMarginWidth();
 213
 214   // make sure that this item is at least as
 215   // tall as the user's system settings specify
 216   if (*pheight < m_nMinHeight)
 217     *pheight = m_nMinHeight;
 218
 219   m_nHeight = *pheight;                // remember height for use in OnDrawItem
 220
 221   return TRUE;
 222 }
 223
 224 // searching for this macro you'll find all the code where I'm using the native
 225 // Win32 GDI functions and not wxWindows ones. Might help to whoever decides to
 226 // port this code to X. (VZ)
 227
 228 #if defined(__WIN32__) && !defined(__SYMANTEC__)
 229 #define   O_DRAW_NATIVE_API     // comments below explain why I use it
 230 #endif
 231
 232 // draw the item
 233 bool wxOwnerDrawn::OnDrawItem(wxDC& dc,
 234                               const wxRect& rc,
 235                               wxODAction act,
 236                               wxODStatus st)
 237 {
 238   // we do nothing on focus change
 239   if ( act == wxODFocusChanged )
 240     return TRUE;
 241
 242   // wxColor <-> RGB
 243   #define   ToRGB(col)  PALETTERGB(col.Red(), col.Green(), col.Blue())
 244   #define   UnRGB(col)  GetRValue(col), GetGValue(col), GetBValue(col)
 245
 246
 247   // this flag determines whether or not an edge will
 248   // be drawn around the bitmap. In most "windows classic"
 249   // applications, a 1-pixel highlight edge is drawn around
 250   // the bitmap of an item when it is selected.  However,
 251   // with the new "luna" theme, no edge is drawn around
 252   // the bitmap because the background is white (this applies
 253   // only to "non-XP style" menus w/ bitmaps --
 254   // see IE 6 menus for an example)
 255
 256   bool draw_bitmap_edge = true;
 257
 258   // set the colors
 259   // --------------
 260   DWORD colBack, colText;
 261   if ( st & wxODSelected ) {
 262     colBack = GetSysColor(COLOR_HIGHLIGHT);
 263     if (!(st & wxODDisabled))
 264     {
 265         colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 266     }
 267      else
 268     {
 269         colText = GetSysColor(COLOR_GRAYTEXT);
 270     }
 271   }
 272   else {
 273     // fall back to default colors if none explicitly specified
 274     colBack = m_colBack.Ok() ? ToRGB(m_colBack) : GetSysColor(COLOR_WINDOW);
 275     colText = m_colText.Ok() ? ToRGB(m_colText) : GetSysColor(COLOR_WINDOWTEXT);
 276   }
 277
 278
 279   // if background is white, don't draw an edge around the bitmap
 280   DWORD menu_bg_color = GetSysColor(COLOR_MENU);
 281   if (GetRValue(menu_bg_color) >= 0xf0 &&
 282       GetGValue(menu_bg_color) >= 0xf0 &&
 283       GetBValue(menu_bg_color) >= 0xf0)
 284   {
 285       draw_bitmap_edge = false;
 286   }
 287
 288
 289   #ifdef  O_DRAW_NATIVE_API
 290     #define  hdc           (HDC)dc.GetHDC()
 291     COLORREF colOldText = ::SetTextColor(hdc, colText),
 292              colOldBack = ::SetBkColor(hdc, colBack);
 293   #else
 294     dc.SetTextForeground(wxColor(UnRGB(colText)));
 295     dc.SetTextBackground(wxColor(UnRGB(colBack)));
 296   #endif
 297
 298   // select the font and draw the text
 299   // ---------------------------------
 300
 301
 302   // determine where to draw and leave space for a check-mark.
 303   // Add 3 pixel padding so text appears well within highlight rectangle
 304   int x = rc.x + GetMarginWidth() + 3;
 305
 306
 307   // using native API because it reckognizes '&'
 308   #ifdef  O_DRAW_NATIVE_API
 309     int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 310     HBRUSH hbr = CreateSolidBrush(colBack),
 311            hPrevBrush = (HBRUSH)SelectObject(hdc, hbr);
 312
 313     RECT rectFill = { rc.GetLeft(), rc.GetTop(), rc.GetRight()+1, rc.GetBottom() };
 314
 315     if ( st & wxODSelected && m_bmpChecked.Ok() && draw_bitmap_edge) {
 316         // only draw the highlight under the text, not under
 317         // the bitmap or checkmark; leave a 1-pixel gap.
 318         rectFill.left = GetMarginWidth() + 1;
 319     }
 320
 321     FillRect(hdc, &rectFill, hbr);
 322
 323     // use default font if no font set
 324     HFONT hfont;
 325     if ( m_font.Ok() ) {
 326       m_font.RealizeResource();
 327       hfont = (HFONT)m_font.GetResourceHandle();
 328     }
 329     else {
 330       hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 331     }
 332
 333     HFONT hPrevFont = (HFONT) ::SelectObject(hdc, hfont);
 334
 335     wxString strMenuText = m_strName.BeforeFirst('\t');
 336
 337     SIZE sizeRect;
 338     GetTextExtentPoint32(hdc,strMenuText.c_str(), strMenuText.Length(),&sizeRect);
 339     ::DrawState(hdc, NULL, NULL,
 340                 (LPARAM)strMenuText.c_str(), strMenuText.length(),
 341                 x, rc.y+( (int) ((rc.GetHeight()-sizeRect.cy)/2.0) )-1, // centre text vertically
 342                 rc.GetWidth()-GetMarginWidth(), sizeRect.cy,
 343                 DST_PREFIXTEXT |
 344                 (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0));
 345
 346     if ( !m_strAccel.empty() )
 347     {
 348         // right align accel string with right edge of menu ( offset by the margin width )
 349         ::SetTextAlign(hdc, TA_RIGHT);
 350         ::DrawState(hdc, NULL, NULL,
 351                     (LPARAM)m_strAccel.c_str(), m_strAccel.length(),
 352                     rc.GetWidth()-(GetMarginWidth()), rc.y+(int) ((rc.GetHeight()-sizeRect.cy)/2.0),
 353                     rc.GetWidth()-GetMarginWidth(), sizeRect.cy,
 354                     DST_TEXT |
 355                     (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0));
 356         ::SetTextAlign(hdc, TA_LEFT);
 357     }
 358
 359     (void)SelectObject(hdc, hPrevBrush);
 360     (void)SelectObject(hdc, hPrevFont);
 361     (void)SetBkMode(hdc, nPrevMode);
 362
 363     DeleteObject(hbr);
 364   #else
 365     dc.SetFont(GetFont());
 366     dc.DrawText(wxStripMenuCodes(m_strName), x, rc.y);
 367   #endif  //O_DRAW_NATIVE_API
 368
 369   // draw the bitmap
 370   // ---------------
 371   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 372     if ( st & wxODChecked ) {
 373       // using native APIs for performance and simplicity
 374 #ifdef  O_DRAW_NATIVE_API
 375       // what goes on: DrawFrameControl creates a b/w mask,
 376       // then we copy it to screen to have right colors
 377
 378         // first create a monochrome bitmap in a memory DC
 379       HDC hdcMem = CreateCompatibleDC(hdc);
 380       HBITMAP hbmpCheck = CreateBitmap(GetMarginWidth(), m_nHeight, 1, 1, 0);
 381       SelectObject(hdcMem, hbmpCheck);
 382
 383         // then draw a check mark into it
 384       RECT rect = { 0, 0, GetMarginWidth(), m_nHeight };
 385       if ( m_nHeight > 0 )
 386       {
 387         ::DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 388       }
 389
 390         // finally copy it to screen DC and clean up
 391       BitBlt(hdc, rc.x, rc.y, GetMarginWidth(), m_nHeight,
 392              hdcMem, 0, 0, SRCCOPY);
 393
 394       DeleteDC(hdcMem);
 395       DeleteObject(hbmpCheck);
 396 #else
 397         // #### to do: perhaps using Marlett font (create equiv. font under X)
 398 //        wxFAIL("not implemented");
 399 #endif  //O_DRAW_NATIVE_API
 400     }
 401   }
 402   else {
 403     // for uncheckable item we use only the 'checked' bitmap
 404     wxBitmap bmp(GetBitmap(IsCheckable() ? ((st & wxODChecked) != 0) : TRUE));
 405     if ( bmp.Ok() ) {
 406       wxMemoryDC dcMem(&dc);
 407       dcMem.SelectObject(bmp);
 408
 409       // center bitmap
 410       int nBmpWidth = bmp.GetWidth(),
 411           nBmpHeight = bmp.GetHeight();
 412
 413       // there should be enough place!
 414       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 415
 416       int heightDiff = m_nHeight - nBmpHeight;
 417       dc.Blit(rc.x + (GetMarginWidth() - nBmpWidth) / 2,
 418               rc.y + heightDiff / 2,
 419               nBmpWidth, nBmpHeight,
 420               &dcMem, 0, 0, wxCOPY, TRUE /* use mask */);
 421
 422       if ( st & wxODSelected && draw_bitmap_edge ) {
 423         #ifdef  O_DRAW_NATIVE_API
 424           RECT rectBmp = { rc.GetLeft(), rc.GetTop(),
 425                            rc.GetLeft() + GetMarginWidth(),
 426                            rc.GetTop() + m_nHeight-1 };
 427           SetBkColor(hdc, colBack);
 428           DrawEdge(hdc, &rectBmp, BDR_RAISEDOUTER, BF_SOFT | BF_RECT);
 429         #else
 430           int x1, y1, x2, y2;
 431           x1 = rc.x;
 432           y1 = rc.y;
 433           x2 = x1 + GetMarginWidth() - 1;
 434           y2 = y1 + m_nHeight - 1;
 435
 436           dc.SetPen(*wxWHITE_PEN);
 437           dc.DrawLine(x1, y1, x2, y1);
 438           dc.DrawLine(x1, y1, x1, y2);
 439           dc.SetPen(*wxGREY_PEN);
 440           dc.DrawLine(x1, y2-1, x2, y2-1);
 441           dc.DrawLine(x2, y1, x2, y2);
 442         #endif  //O_DRAW_NATIVE_API
 443       }
 444     }
 445   }
 446
 447   #ifdef  O_DRAW_NATIVE_API
 448     ::SetTextColor(hdc, colOldText);
 449     ::SetBkColor(hdc, colOldBack);
 450
 451     #undef  hdc
 452   #endif  //O_DRAW_NATIVE_API
 453
 454   return TRUE;
 455 }
 456
 457
 458 #endif // wxUSE_OWNER_DRAWN
 459