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 license
  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
  39 #if wxUSE_OWNER_DRAWN
  40
  41
  42 // ============================================================================
  43 // implementation of wxOwnerDrawn class
  44 // ============================================================================
  45
  46 // ctor
  47 // ----
  48 wxOwnerDrawn::wxOwnerDrawn(const wxString& str,
  49                            bool bCheckable, bool WXUNUSED(bMenuItem))
  50             : m_strName(str)
  51 {
  52 #if defined(__WXMSW__) && defined(__WIN32__) && defined(SM_CXMENUCHECK)
  53     // get the default menu height and font from the system
  54     NONCLIENTMETRICS nm;
  55     nm.cbSize = sizeof (NONCLIENTMETRICS);
  56     SystemParametersInfo (SPI_GETNONCLIENTMETRICS,0,&nm,0);
  57     m_nMinHeight = nm.iMenuHeight;
  58
  59     // nm.iMenuWidth is the system default for the width of
  60     // menu icons and checkmarks
  61     if (ms_nDefaultMarginWidth == 0)
  62     {
  63        ms_nDefaultMarginWidth = nm.iMenuWidth;
  64        ms_nLastMarginWidth = nm.iMenuWidth;
  65     }
  66
  67     wxNativeFontInfo info;
  68     memcpy(&info.lf, &nm.lfMenuFont, sizeof(LOGFONT));
  69     m_font.Create(info);
  70 #else
  71     // windows clean install default
  72     m_nMinHeight = 18;
  73
  74     if (ms_nDefaultMarginWidth == 0)
  75     {
  76         ms_nDefaultMarginWidth = 18;
  77         ms_nLastMarginWidth = 18;
  78     }
  79     if (wxNORMAL_FONT)
  80        m_font = *wxNORMAL_FONT;
  81 #endif
  82
  83     m_bCheckable   = bCheckable;
  84     m_bOwnerDrawn  = FALSE;
  85     m_nHeight      = 0;
  86     m_nMarginWidth = ms_nLastMarginWidth;
  87 }
  88
  89
  90 // these items will be set during the first invocation of the c'tor,
  91 // because the values will be determined by checking the system settings,
  92 // which is a chunk of code
  93 size_t wxOwnerDrawn::ms_nDefaultMarginWidth = 0;
  94 size_t wxOwnerDrawn::ms_nLastMarginWidth = 0;
  95
  96
  97 // drawing
  98 // -------
  99
 100 // get size of the item
 101 bool wxOwnerDrawn::OnMeasureItem(size_t *pwidth, size_t *pheight)
 102 {
 103   wxMemoryDC dc;
 104
 105   wxString str = wxStripMenuCodes(m_strName);
 106
 107   // # without this menu items look too tightly packed (at least under Windows)
 108   str += wxT('W'); // 'W' is typically the widest letter
 109
 110   if (m_font.Ok())
 111       dc.SetFont(GetFont());
 112
 113   dc.GetTextExtent(str, (long *)pwidth, (long *)pheight);
 114
 115   if (!m_strAccel.IsEmpty())
 116   {
 117       // measure the accelerator string, and add it's width to
 118       // the total item width, plus 16 (Accelerators are right justified,
 119       // with the right edge of the text rectangle 16 pixels left of
 120       // the right edge of the menu)
 121
 122       int accel_width, accel_height;
 123       dc.GetTextExtent(m_strAccel, &accel_width, &accel_height);
 124       *pwidth += (accel_width + 16);
 125   }
 126
 127   // JACS: items still look too tightly packed, so adding 5 pixels.
 128   (*pheight) = (*pheight) + 5;
 129
 130   // Ray Gilbert's changes - Corrects the problem of a BMP
 131   // being placed next to text in a menu item, and the BMP does
 132   // not match the size expected by the system.  This will
 133   // resize the space so the BMP will fit.  Without this, BMPs
 134   // must be no larger or smaller than 16x16.
 135   if (m_bmpChecked.Ok())
 136   {
 137       // Is BMP height larger then text height?
 138       size_t adjustedHeight = m_bmpChecked.GetHeight() +
 139                               wxSystemSettings::GetMetric(wxSYS_EDGE_Y);
 140       if (*pheight < adjustedHeight)
 141           *pheight = adjustedHeight;
 142
 143       // Does BMP encroach on default check menu position?
 144       size_t adjustedWidth = m_bmpChecked.GetWidth() +
 145                              (wxSystemSettings::GetMetric(wxSYS_EDGE_X) * 2);
 146       if (ms_nDefaultMarginWidth < adjustedWidth)
 147           *pwidth += adjustedWidth - ms_nDefaultMarginWidth;
 148
 149       // Do we need to widen margin to fit BMP?
 150       if ((size_t)GetMarginWidth() < adjustedWidth)
 151           SetMarginWidth(adjustedWidth);
 152   }
 153
 154   // make sure that this item is at least as
 155   // tall as the user's system settings specify
 156   if (*pheight < m_nMinHeight)
 157     *pheight = m_nMinHeight;
 158
 159   m_nHeight = *pheight;                // remember height for use in OnDrawItem
 160
 161   return TRUE;
 162 }
 163
 164 // searching for this macro you'll find all the code where I'm using the native
 165 // Win32 GDI functions and not wxWindows ones. Might help to whoever decides to
 166 // port this code to X. (VZ)
 167
 168 // JACS: TODO. Why does a disabled but highlighted item still
 169 // get drawn embossed? How can we tell DrawState that we don't want the
 170 // embossing?
 171
 172 #if defined(__WIN32__) && !defined(__SC__) && !defined(__TWIN32__)
 173 #define   O_DRAW_NATIVE_API     // comments below explain why I use it
 174 #endif
 175
 176 // draw the item
 177 bool wxOwnerDrawn::OnDrawItem(wxDC& dc,
 178                               const wxRect& rc,
 179                               wxODAction act,
 180                               wxODStatus st)
 181 {
 182   // we do nothing on focus change
 183   if ( act == wxODFocusChanged )
 184     return TRUE;
 185
 186   // wxColor <-> RGB
 187   #define   ToRGB(col)  PALETTERGB(col.Red(), col.Green(), col.Blue())
 188   #define   UnRGB(col)  GetRValue(col), GetGValue(col), GetBValue(col)
 189
 190   // set the colors
 191   // --------------
 192   DWORD colBack, colText;
 193   if ( st & wxODSelected ) {
 194     colBack = GetSysColor(COLOR_HIGHLIGHT);
 195     if (!(st & wxODDisabled))
 196     {
 197         colText = GetSysColor(COLOR_HIGHLIGHTTEXT);
 198     }
 199      else
 200     {
 201         colText = GetSysColor(COLOR_GRAYTEXT);
 202     }
 203   }
 204   else {
 205     // fall back to default colors if none explicitly specified
 206     colBack = m_colBack.Ok() ? ToRGB(m_colBack) : GetSysColor(COLOR_WINDOW);
 207     colText = m_colText.Ok() ? ToRGB(m_colText) : GetSysColor(COLOR_WINDOWTEXT);
 208   }
 209
 210   #ifdef  O_DRAW_NATIVE_API
 211     #define  hdc           (HDC)dc.GetHDC()
 212     COLORREF colOldText = ::SetTextColor(hdc, colText),
 213              colOldBack = ::SetBkColor(hdc, colBack);
 214   #else
 215     dc.SetTextForeground(wxColor(UnRGB(colText)));
 216     dc.SetTextBackground(wxColor(UnRGB(colBack)));
 217   #endif
 218
 219   // select the font and draw the text
 220   // ---------------------------------
 221
 222
 223   // determine where to draw and leave space for a check-mark.
 224   // Add 3 pixel padding so text appears well within highlight rectangle
 225   int x = rc.x + GetMarginWidth() + 3;
 226
 227
 228   // using native API because it reckognizes '&'
 229   #ifdef  O_DRAW_NATIVE_API
 230     int nPrevMode = SetBkMode(hdc, TRANSPARENT);
 231     HBRUSH hbr = CreateSolidBrush(colBack),
 232            hPrevBrush = (HBRUSH)SelectObject(hdc, hbr);
 233
 234     RECT rectFill = { rc.GetLeft(), rc.GetTop(), rc.GetRight()+1, rc.GetBottom() };
 235
 236     if ( st & wxODSelected && m_bmpChecked.Ok()) {
 237         // only draw the highlight under the text, not under
 238         // the bitmap or checkmark; leave a 1-pixel gap.
 239         rectFill.left = GetMarginWidth() + 1;
 240     }
 241
 242     FillRect(hdc, &rectFill, hbr);
 243
 244     // use default font if no font set
 245     HFONT hfont;
 246     if ( m_font.Ok() ) {
 247       m_font.RealizeResource();
 248       hfont = (HFONT)m_font.GetResourceHandle();
 249     }
 250     else {
 251       hfont = (HFONT)::GetStockObject(SYSTEM_FONT);
 252     }
 253
 254     HFONT hPrevFont = (HFONT) ::SelectObject(hdc, hfont);
 255
 256     wxString strMenuText = m_strName.BeforeFirst('\t');
 257
 258     ::DrawState(hdc, NULL, NULL,
 259                 (LPARAM)strMenuText.c_str(), strMenuText.length(),
 260                 x, rc.y + 1, rc.GetWidth(), rc.GetHeight(),
 261                 DST_PREFIXTEXT |
 262                 (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0));
 263
 264     if ( !m_strAccel.empty() )
 265     {
 266         int accel_width, accel_height;
 267         dc.GetTextExtent(m_strAccel, &accel_width, &accel_height);
 268
 269         ::DrawState(hdc, NULL, NULL,
 270                     (LPARAM)m_strAccel.c_str(), m_strAccel.length(),
 271                     rc.GetRight() - accel_width - 16, rc.y + 1, 0, 0,
 272                     DST_TEXT |
 273                     (((st & wxODDisabled) && !(st & wxODSelected)) ? DSS_DISABLED : 0));
 274     }
 275
 276     (void)SelectObject(hdc, hPrevBrush);
 277     (void)SelectObject(hdc, hPrevFont);
 278     (void)SetBkMode(hdc, nPrevMode);
 279
 280     DeleteObject(hbr);
 281   #else
 282     dc.SetFont(GetFont());
 283     dc.DrawText(wxStripMenuCodes(m_strName), x, rc.y);
 284   #endif  //O_DRAW_NATIVE_API
 285
 286   // draw the bitmap
 287   // ---------------
 288   if ( IsCheckable() && !m_bmpChecked.Ok() ) {
 289     if ( st & wxODChecked ) {
 290       // using native APIs for performance and simplicity
 291 #ifdef  O_DRAW_NATIVE_API
 292       // what goes on: DrawFrameControl creates a b/w mask,
 293       // then we copy it to screen to have right colors
 294
 295         // first create a monochrome bitmap in a memory DC
 296       HDC hdcMem = CreateCompatibleDC(hdc);
 297       HBITMAP hbmpCheck = CreateBitmap(GetMarginWidth(), m_nHeight, 1, 1, 0);
 298       SelectObject(hdcMem, hbmpCheck);
 299
 300         // then draw a check mark into it
 301       RECT rect = { 0, 0, GetMarginWidth(), m_nHeight };
 302       if ( m_nHeight > 0 )
 303       {
 304         ::DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 305       }
 306
 307         // finally copy it to screen DC and clean up
 308       BitBlt(hdc, rc.x, rc.y, GetMarginWidth(), m_nHeight,
 309              hdcMem, 0, 0, SRCCOPY);
 310
 311       DeleteDC(hdcMem);
 312       DeleteObject(hbmpCheck);
 313 #else
 314         // #### to do: perhaps using Marlett font (create equiv. font under X)
 315 //        wxFAIL("not implemented");
 316 #endif  //O_DRAW_NATIVE_API
 317     }
 318   }
 319   else {
 320     // for uncheckable item we use only the 'checked' bitmap
 321     wxBitmap bmp(GetBitmap(IsCheckable() ? ((st & wxODChecked) != 0) : TRUE));
 322     if ( bmp.Ok() ) {
 323       wxMemoryDC dcMem(&dc);
 324       dcMem.SelectObject(bmp);
 325
 326       // center bitmap
 327       int nBmpWidth = bmp.GetWidth(),
 328           nBmpHeight = bmp.GetHeight();
 329
 330       // there should be enough place!
 331       wxASSERT((nBmpWidth <= rc.GetWidth()) && (nBmpHeight <= rc.GetHeight()));
 332
 333       int heightDiff = m_nHeight - nBmpHeight;
 334       dc.Blit(rc.x + (GetMarginWidth() - nBmpWidth) / 2,
 335               rc.y + heightDiff / 2,
 336               nBmpWidth, nBmpHeight,
 337               &dcMem, 0, 0, wxCOPY, TRUE /* use mask */);
 338
 339       if ( st & wxODSelected ) {
 340
 341           int x1, y1, x2, y2;
 342           x1 = rc.x;
 343           y1 = rc.y;
 344           x2 = x1 + GetMarginWidth() - 1;
 345           y2 = y1 + m_nHeight - 1;
 346
 347           dc.SetPen(*wxWHITE_PEN);
 348           dc.DrawLine(x1, y1, x2, y1);
 349           dc.DrawLine(x1, y1, x1, y2);
 350           dc.SetPen(*wxGREY_PEN);
 351           dc.DrawLine(x1, y2-1, x2, y2-1);
 352           dc.DrawLine(x2, y1, x2, y2);
 353       }
 354     }
 355   }
 356
 357   #ifdef  O_DRAW_NATIVE_API
 358     ::SetTextColor(hdc, colOldText);
 359     ::SetBkColor(hdc, colOldBack);
 360
 361     #undef  hdc
 362   #endif  //O_DRAW_NATIVE_API
 363
 364   return TRUE;
 365 }
 366
 367
 368 #endif // wxUSE_OWNER_DRAWN
 369