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