src/gtk/cursor.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/cursor.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #include "wx/cursor.h"
  14
  15 #ifndef WX_PRECOMP
  16     #include "wx/app.h"
  17     #include "wx/utils.h"
  18     #include "wx/image.h"
  19 #endif // WX_PRECOMP
  20
  21 #include "wx/gtk/private.h" //for idle stuff
  22
  23 //-----------------------------------------------------------------------------
  24 // wxCursor
  25 //-----------------------------------------------------------------------------
  26
  27 class wxCursorRefData: public wxObjectRefData
  28 {
  29   public:
  30
  31     wxCursorRefData();
  32     ~wxCursorRefData();
  33
  34     GdkCursor *m_cursor;
  35 };
  36
  37 wxCursorRefData::wxCursorRefData()
  38 {
  39     m_cursor = (GdkCursor *) NULL;
  40 }
  41
  42 wxCursorRefData::~wxCursorRefData()
  43 {
  44     if (m_cursor) gdk_cursor_unref( m_cursor );
  45 }
  46
  47 //-----------------------------------------------------------------------------
  48
  49 #define M_CURSORDATA ((wxCursorRefData *)m_refData)
  50
  51 IMPLEMENT_DYNAMIC_CLASS(wxCursor,wxObject)
  52
  53 wxCursor::wxCursor()
  54 {
  55
  56 }
  57
  58 wxCursor::wxCursor( int cursorId )
  59 {
  60     m_refData = new wxCursorRefData();
  61
  62     GdkCursorType gdk_cur = GDK_LEFT_PTR;
  63     switch (cursorId)
  64     {
  65         case wxCURSOR_BLANK:
  66             {
  67                 static const gchar bits[] = { 0 };
  68                 static /* const -- not in GTK1 */ GdkColor color = { 0, 0, 0, 0 };
  69
  70                 GdkPixmap *pixmap = gdk_bitmap_create_from_data(NULL, bits, 1, 1);
  71                 M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixmap(pixmap,
  72                                                                     pixmap,
  73                                                                     &color,
  74                                                                     &color,
  75                                                                     0, 0);
  76             }
  77             return;
  78
  79         case wxCURSOR_ARROW:            // fall through to default
  80         case wxCURSOR_DEFAULT:          gdk_cur = GDK_LEFT_PTR; break;
  81         case wxCURSOR_RIGHT_ARROW:      gdk_cur = GDK_RIGHT_PTR; break;
  82         case wxCURSOR_HAND:             gdk_cur = GDK_HAND1; break;
  83         case wxCURSOR_CROSS:            gdk_cur = GDK_CROSSHAIR; break;
  84         case wxCURSOR_SIZEWE:           gdk_cur = GDK_SB_H_DOUBLE_ARROW; break;
  85         case wxCURSOR_SIZENS:           gdk_cur = GDK_SB_V_DOUBLE_ARROW; break;
  86         case wxCURSOR_ARROWWAIT:
  87         case wxCURSOR_WAIT:
  88         case wxCURSOR_WATCH:            gdk_cur = GDK_WATCH; break;
  89         case wxCURSOR_SIZING:           gdk_cur = GDK_FLEUR; break;
  90         case wxCURSOR_SPRAYCAN:         gdk_cur = GDK_SPRAYCAN; break;
  91         case wxCURSOR_IBEAM:            gdk_cur = GDK_XTERM; break;
  92         case wxCURSOR_PENCIL:           gdk_cur = GDK_PENCIL; break;
  93         case wxCURSOR_NO_ENTRY:         gdk_cur = GDK_PIRATE; break;
  94         case wxCURSOR_SIZENWSE:
  95         case wxCURSOR_SIZENESW:         gdk_cur = GDK_FLEUR; break;
  96         case wxCURSOR_QUESTION_ARROW:   gdk_cur = GDK_QUESTION_ARROW; break;
  97         case wxCURSOR_PAINT_BRUSH:      gdk_cur = GDK_SPRAYCAN; break;
  98         case wxCURSOR_MAGNIFIER:        gdk_cur = GDK_PLUS; break;
  99         case wxCURSOR_CHAR:             gdk_cur = GDK_XTERM; break;
 100         case wxCURSOR_LEFT_BUTTON:      gdk_cur = GDK_LEFTBUTTON; break;
 101         case wxCURSOR_MIDDLE_BUTTON:    gdk_cur = GDK_MIDDLEBUTTON; break;
 102         case wxCURSOR_RIGHT_BUTTON:     gdk_cur = GDK_RIGHTBUTTON; break;
 103         case wxCURSOR_BULLSEYE:         gdk_cur = GDK_TARGET; break;
 104
 105         case wxCURSOR_POINT_LEFT:       gdk_cur = GDK_SB_LEFT_ARROW; break;
 106         case wxCURSOR_POINT_RIGHT:      gdk_cur = GDK_SB_RIGHT_ARROW; break;
 107 /*
 108         case wxCURSOR_DOUBLE_ARROW:     gdk_cur = GDK_DOUBLE_ARROW; break;
 109         case wxCURSOR_CROSS_REVERSE:    gdk_cur = GDK_CROSS_REVERSE; break;
 110         case wxCURSOR_BASED_ARROW_UP:   gdk_cur = GDK_BASED_ARROW_UP; break;
 111         case wxCURSOR_BASED_ARROW_DOWN: gdk_cur = GDK_BASED_ARROW_DOWN; break;
 112 */
 113
 114         default:
 115             wxFAIL_MSG(wxT("unsupported cursor type"));
 116             // will use the standard one
 117             break;
 118     }
 119
 120     M_CURSORDATA->m_cursor = gdk_cursor_new( gdk_cur );
 121 }
 122
 123 extern GtkWidget *wxGetRootWindow();
 124
 125 wxCursor::wxCursor(const char bits[], int width, int  height,
 126                    int hotSpotX, int hotSpotY,
 127                    const char maskBits[], const wxColour *fg, const wxColour *bg)
 128 {
 129     if (!maskBits)
 130         maskBits = bits;
 131     if (!fg)
 132         fg = wxBLACK;
 133     if (!bg)
 134         bg = wxWHITE;
 135     if (hotSpotX < 0 || hotSpotX >= width)
 136         hotSpotX = 0;
 137     if (hotSpotY < 0 || hotSpotY >= height)
 138         hotSpotY = 0;
 139
 140     GdkBitmap *data = gdk_bitmap_create_from_data( wxGetRootWindow()->window, (gchar *) bits, width, height );
 141     GdkBitmap *mask = gdk_bitmap_create_from_data( wxGetRootWindow()->window, (gchar *) maskBits, width, height);
 142
 143     m_refData = new wxCursorRefData;
 144     M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixmap(
 145                  data, mask, fg->GetColor(), bg->GetColor(),
 146                  hotSpotX, hotSpotY );
 147
 148     g_object_unref (data);
 149     g_object_unref (mask);
 150 }
 151
 152 #if wxUSE_IMAGE
 153
 154 wxCursor::wxCursor( const wxImage & image )
 155 {
 156     unsigned char * rgbBits = image.GetData();
 157     int w = image.GetWidth() ;
 158     int h = image.GetHeight();
 159     bool bHasMask = image.HasMask();
 160     int imagebitcount = (w*h)/8;
 161
 162     unsigned char * bits = new unsigned char [imagebitcount];
 163     unsigned char * maskBits = new unsigned char [imagebitcount];
 164
 165     int i, j, i8; unsigned char c, cMask;
 166     for (i=0; i<imagebitcount; i++)
 167     {
 168         bits[i] = 0;
 169         i8 = i * 8;
 170
 171         cMask = 1;
 172         for (j=0; j<8; j++)
 173         {
 174             // possible overflow if we do the summation first ?
 175             c = rgbBits[(i8+j)*3]/3 + rgbBits[(i8+j)*3+1]/3 + rgbBits[(i8+j)*3+2]/3;
 176             //if average value is > mid grey
 177             if (c>127)
 178                 bits[i] = bits[i] | cMask;
 179             cMask = cMask * 2;
 180         }
 181     }
 182
 183     unsigned long keyMaskColor;
 184     if (bHasMask)
 185     {
 186         unsigned char
 187             r = image.GetMaskRed(),
 188             g = image.GetMaskGreen(),
 189             b = image.GetMaskBlue();
 190
 191         for (i=0; i<imagebitcount; i++)
 192         {
 193             maskBits[i] = 0x0;
 194             i8 = i * 8;
 195
 196             cMask = 1;
 197             for (j=0; j<8; j++)
 198             {
 199                 if (rgbBits[(i8+j)*3] != r || rgbBits[(i8+j)*3+1] != g || rgbBits[(i8+j)*3+2] != b)
 200                     maskBits[i] = maskBits[i] | cMask;
 201                 cMask = cMask * 2;
 202             }
 203         }
 204
 205         keyMaskColor = (r << 16) | (g << 8) | b;
 206     }
 207     else // no mask
 208     {
 209         for (i=0; i<imagebitcount; i++)
 210             maskBits[i] = 0xFF;
 211
 212         // init it to avoid compiler warnings
 213         keyMaskColor = 0;
 214     }
 215
 216     // find the most frequent color(s)
 217     wxImageHistogram histogram;
 218     image.ComputeHistogram(histogram);
 219
 220     // colors as rrggbb
 221     unsigned long key;
 222     unsigned long value;
 223
 224     long colMostFreq = 0;
 225     unsigned long nMost = 0;
 226     long colNextMostFreq = 0;
 227     unsigned long nNext = 0;
 228     for ( wxImageHistogram::iterator entry = histogram.begin();
 229           entry != histogram.end();
 230           ++entry )
 231     {
 232         value = entry->second.value;
 233         key = entry->first;
 234         if ( !bHasMask || (key != keyMaskColor) )
 235         {
 236             if (value > nMost)
 237             {
 238                 nMost = value;
 239                 colMostFreq = key;
 240             }
 241             else if (value > nNext)
 242             {
 243                 nNext = value;
 244                 colNextMostFreq = key;
 245             }
 246         }
 247     }
 248
 249     wxColour fg = wxColour ( (unsigned char)(colMostFreq >> 16),
 250                              (unsigned char)(colMostFreq >> 8),
 251                              (unsigned char)(colMostFreq) );
 252
 253     wxColour bg = wxColour ( (unsigned char)(colNextMostFreq >> 16),
 254                              (unsigned char)(colNextMostFreq >> 8),
 255                              (unsigned char)(colNextMostFreq) );
 256
 257     int fg_intensity = fg.Red() + fg.Green() + fg.Blue();
 258     int bg_intensity = bg.Red() + bg.Green() + bg.Blue();
 259
 260     if (bg_intensity > fg_intensity)
 261     {
 262         //swap fg and bg
 263         wxColour tmp = fg;
 264         fg = bg;
 265         bg = tmp;
 266     }
 267
 268     int hotSpotX;
 269     int hotSpotY;
 270
 271     if (image.HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X))
 272         hotSpotX = image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X);
 273     else
 274         hotSpotX = 0;
 275
 276     if (image.HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y))
 277         hotSpotY = image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y);
 278     else
 279         hotSpotY = 0;
 280
 281     if (hotSpotX < 0 || hotSpotX >= w)
 282         hotSpotX = 0;
 283     if (hotSpotY < 0 || hotSpotY >= h)
 284         hotSpotY = 0;
 285
 286     GdkBitmap *data = gdk_bitmap_create_from_data(wxGetRootWindow()->window,
 287                                                   (gchar *) bits, w, h);
 288     GdkBitmap *mask = gdk_bitmap_create_from_data(wxGetRootWindow()->window,
 289                                                   (gchar *) maskBits, w, h);
 290
 291     m_refData = new wxCursorRefData;
 292     M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixmap
 293                              (
 294                                 data,
 295                                 mask,
 296                                 fg.GetColor(), bg.GetColor(),
 297                                 hotSpotX, hotSpotY
 298                              );
 299
 300     g_object_unref (data);
 301     g_object_unref (mask);
 302     delete [] bits;
 303     delete [] maskBits;
 304 }
 305
 306 #endif // wxUSE_IMAGE
 307
 308 wxCursor::~wxCursor()
 309 {
 310 }
 311
 312 bool wxCursor::operator == ( const wxCursor& cursor ) const
 313 {
 314     return m_refData == cursor.m_refData;
 315 }
 316
 317 bool wxCursor::operator != ( const wxCursor& cursor ) const
 318 {
 319     return m_refData != cursor.m_refData;
 320 }
 321
 322 bool wxCursor::Ok() const
 323 {
 324     return (m_refData != NULL);
 325 }
 326
 327 GdkCursor *wxCursor::GetCursor() const
 328 {
 329     return M_CURSORDATA->m_cursor;
 330 }
 331
 332 //-----------------------------------------------------------------------------
 333 // busy cursor routines
 334 //-----------------------------------------------------------------------------
 335
 336 extern wxCursor g_globalCursor;
 337
 338 static wxCursor  gs_savedCursor;
 339 static int       gs_busyCount = 0;
 340
 341 const wxCursor &wxBusyCursor::GetStoredCursor()
 342 {
 343     return gs_savedCursor;
 344 }
 345
 346 const wxCursor wxBusyCursor::GetBusyCursor()
 347 {
 348     return wxCursor(wxCURSOR_WATCH);
 349 }
 350
 351 void wxEndBusyCursor()
 352 {
 353     if (--gs_busyCount > 0)
 354         return;
 355
 356     wxSetCursor( gs_savedCursor );
 357     gs_savedCursor = wxNullCursor;
 358
 359     if (wxTheApp)
 360         wxTheApp->ProcessIdle();
 361 }
 362
 363 void wxBeginBusyCursor( const wxCursor *WXUNUSED(cursor) )
 364 {
 365     if (gs_busyCount++ > 0)
 366         return;
 367
 368     wxASSERT_MSG( !gs_savedCursor.Ok(),
 369                   wxT("forgot to call wxEndBusyCursor, will leak memory") );
 370
 371     gs_savedCursor = g_globalCursor;
 372
 373     wxSetCursor( wxCursor(wxCURSOR_WATCH) );
 374
 375     if (wxTheApp)
 376         wxTheApp->ProcessIdle();
 377
 378     gdk_flush();
 379 }
 380
 381 bool wxIsBusy()
 382 {
 383     return gs_busyCount > 0;
 384 }
 385
 386 void wxSetCursor( const wxCursor& cursor )
 387 {
 388     if (g_isIdle)
 389         wxapp_install_idle_handler();
 390
 391     g_globalCursor = cursor;
 392 }