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/window.h"
  17     #include "wx/app.h"
  18     #include "wx/image.h"
  19     #include "wx/bitmap.h"
  20     #include "wx/log.h"
  21 #endif // WX_PRECOMP
  22
  23 #include <gtk/gtk.h>
  24
  25 //-----------------------------------------------------------------------------
  26 // wxCursor
  27 //-----------------------------------------------------------------------------
  28
  29 class wxCursorRefData: public wxGDIRefData
  30 {
  31 public:
  32     wxCursorRefData();
  33     virtual ~wxCursorRefData();
  34
  35     virtual bool IsOk() const { return m_cursor != NULL; }
  36
  37     GdkCursor *m_cursor;
  38 };
  39
  40 wxCursorRefData::wxCursorRefData()
  41 {
  42     m_cursor = NULL;
  43 }
  44
  45 wxCursorRefData::~wxCursorRefData()
  46 {
  47     if (m_cursor) gdk_cursor_unref( m_cursor );
  48 }
  49
  50 //-----------------------------------------------------------------------------
  51
  52 #define M_CURSORDATA static_cast<wxCursorRefData*>(m_refData)
  53
  54 IMPLEMENT_DYNAMIC_CLASS(wxCursor, wxGDIObject)
  55
  56 wxCursor::wxCursor()
  57 {
  58 }
  59
  60 void wxCursor::InitFromStock( wxStockCursor cursorId )
  61 {
  62     m_refData = new wxCursorRefData();
  63
  64     GdkCursorType gdk_cur = GDK_LEFT_PTR;
  65     switch (cursorId)
  66     {
  67         case wxCURSOR_BLANK:
  68             {
  69                 const char bits[] = { 0 };
  70                 const GdkColor color = { 0, 0, 0, 0 };
  71
  72                 GdkPixmap *pixmap = gdk_bitmap_create_from_data(NULL, bits, 1, 1);
  73                 M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixmap(pixmap,
  74                                                                     pixmap,
  75                                                                     &color,
  76                                                                     &color,
  77                                                                     0, 0);
  78                 g_object_unref(pixmap);
  79             }
  80             return;
  81
  82         case wxCURSOR_ARROW:            // fall through to default
  83         case wxCURSOR_DEFAULT:          gdk_cur = GDK_LEFT_PTR; break;
  84         case wxCURSOR_RIGHT_ARROW:      gdk_cur = GDK_RIGHT_PTR; break;
  85         case wxCURSOR_HAND:             gdk_cur = GDK_HAND2; break;
  86         case wxCURSOR_CROSS:            gdk_cur = GDK_CROSSHAIR; break;
  87         case wxCURSOR_SIZEWE:           gdk_cur = GDK_SB_H_DOUBLE_ARROW; break;
  88         case wxCURSOR_SIZENS:           gdk_cur = GDK_SB_V_DOUBLE_ARROW; break;
  89         case wxCURSOR_ARROWWAIT:
  90         case wxCURSOR_WAIT:
  91         case wxCURSOR_WATCH:            gdk_cur = GDK_WATCH; break;
  92         case wxCURSOR_SIZING:           gdk_cur = GDK_SIZING; break;
  93         case wxCURSOR_SPRAYCAN:         gdk_cur = GDK_SPRAYCAN; break;
  94         case wxCURSOR_IBEAM:            gdk_cur = GDK_XTERM; break;
  95         case wxCURSOR_PENCIL:           gdk_cur = GDK_PENCIL; break;
  96         case wxCURSOR_NO_ENTRY:         gdk_cur = GDK_PIRATE; break;
  97         case wxCURSOR_SIZENWSE:
  98         case wxCURSOR_SIZENESW:         gdk_cur = GDK_FLEUR; break;
  99         case wxCURSOR_QUESTION_ARROW:   gdk_cur = GDK_QUESTION_ARROW; break;
 100         case wxCURSOR_PAINT_BRUSH:      gdk_cur = GDK_SPRAYCAN; break;
 101         case wxCURSOR_MAGNIFIER:        gdk_cur = GDK_PLUS; break;
 102         case wxCURSOR_CHAR:             gdk_cur = GDK_XTERM; break;
 103         case wxCURSOR_LEFT_BUTTON:      gdk_cur = GDK_LEFTBUTTON; break;
 104         case wxCURSOR_MIDDLE_BUTTON:    gdk_cur = GDK_MIDDLEBUTTON; break;
 105         case wxCURSOR_RIGHT_BUTTON:     gdk_cur = GDK_RIGHTBUTTON; break;
 106         case wxCURSOR_BULLSEYE:         gdk_cur = GDK_TARGET; break;
 107
 108         case wxCURSOR_POINT_LEFT:       gdk_cur = GDK_SB_LEFT_ARROW; break;
 109         case wxCURSOR_POINT_RIGHT:      gdk_cur = GDK_SB_RIGHT_ARROW; break;
 110 /*
 111         case wxCURSOR_DOUBLE_ARROW:     gdk_cur = GDK_DOUBLE_ARROW; break;
 112         case wxCURSOR_CROSS_REVERSE:    gdk_cur = GDK_CROSS_REVERSE; break;
 113         case wxCURSOR_BASED_ARROW_UP:   gdk_cur = GDK_BASED_ARROW_UP; break;
 114         case wxCURSOR_BASED_ARROW_DOWN: gdk_cur = GDK_BASED_ARROW_DOWN; break;
 115 */
 116
 117         default:
 118             wxFAIL_MSG(wxT("unsupported cursor type"));
 119             // will use the standard one
 120             break;
 121     }
 122
 123     M_CURSORDATA->m_cursor = gdk_cursor_new( gdk_cur );
 124 }
 125
 126
 127 // used in the following two ctors
 128 extern GtkWidget *wxGetRootWindow();
 129
 130 wxCursor::wxCursor(const wxString& cursor_file,
 131                    wxBitmapType type,
 132                    int hotSpotX, int hotSpotY)
 133 {
 134     /* TODO: test this code! */
 135
 136     // Must be an XBM file
 137     if (type != wxBITMAP_TYPE_XPM) {
 138         wxLogError("Invalid cursor bitmap type '%d'", type);
 139         return;
 140     }
 141
 142     // load the XPM
 143     GdkBitmap *mask = NULL;
 144     GdkBitmap *data = gdk_pixmap_create_from_xpm( wxGetRootWindow()->window,
 145                                                   &mask, NULL, cursor_file.mb_str() );
 146     if (!data)
 147         return;
 148
 149     // check given hotspot
 150     gint w, h;
 151     gdk_drawable_get_size( data, &w, &h );
 152     if (hotSpotX < 0 || hotSpotX >= w)
 153         hotSpotX = 0;
 154     if (hotSpotY < 0 || hotSpotY >= h)
 155         hotSpotY = 0;
 156
 157     // create the real cursor
 158     m_refData = new wxCursorRefData;
 159     M_CURSORDATA->m_cursor =
 160         gdk_cursor_new_from_pixmap( data, mask,
 161                                     wxBLACK->GetColor(), wxWHITE->GetColor(),
 162                                     hotSpotX, hotSpotY );
 163
 164     g_object_unref (data);
 165     g_object_unref (mask);
 166 }
 167
 168 wxCursor::wxCursor(const char bits[], int width, int height,
 169                    int hotSpotX, int hotSpotY,
 170                    const char maskBits[], const wxColour *fg, const wxColour *bg)
 171 {
 172     if (!maskBits)
 173         maskBits = bits;
 174     if (!fg)
 175         fg = wxBLACK;
 176     if (!bg)
 177         bg = wxWHITE;
 178     if (hotSpotX < 0 || hotSpotX >= width)
 179         hotSpotX = 0;
 180     if (hotSpotY < 0 || hotSpotY >= height)
 181         hotSpotY = 0;
 182
 183     GdkBitmap *data = gdk_bitmap_create_from_data( wxGetRootWindow()->window, (gchar *) bits, width, height );
 184     GdkBitmap *mask = gdk_bitmap_create_from_data( wxGetRootWindow()->window, (gchar *) maskBits, width, height);
 185
 186     m_refData = new wxCursorRefData;
 187     M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixmap(
 188                  data, mask, fg->GetColor(), bg->GetColor(),
 189                  hotSpotX, hotSpotY );
 190
 191     g_object_unref (data);
 192     g_object_unref (mask);
 193 }
 194
 195 #if wxUSE_IMAGE
 196
 197 static void GetHotSpot(const wxImage& image, int& x, int& y)
 198 {
 199     if (image.HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X))
 200         x = image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X);
 201     else
 202         x = 0;
 203
 204     if (image.HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y))
 205         y = image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y);
 206     else
 207         y = 0;
 208
 209     if (x < 0 || x >= image.GetWidth())
 210         x = 0;
 211     if (y < 0 || y >= image.GetHeight())
 212         y = 0;
 213 }
 214
 215 wxCursor::wxCursor( const wxImage & image )
 216 {
 217     int w = image.GetWidth() ;
 218     int h = image.GetHeight();
 219     bool bHasMask = image.HasMask();
 220     int hotSpotX, hotSpotY;
 221     GetHotSpot(image, hotSpotX, hotSpotY);
 222     m_refData = new wxCursorRefData;
 223     wxImage image_copy(image);
 224
 225     GdkDisplay* display = gdk_drawable_get_display(wxGetRootWindow()->window);
 226     if (gdk_display_supports_cursor_color(display))
 227     {
 228         if (!image.HasAlpha())
 229         {
 230             // add alpha, so wxBitmap will convert to pixbuf format
 231             image_copy.InitAlpha();
 232         }
 233         wxBitmap bitmap(image_copy);
 234         wxASSERT(bitmap.HasPixbuf());
 235         M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixbuf
 236                              (
 237                               display,
 238                               bitmap.GetPixbuf(),
 239                               hotSpotX, hotSpotY
 240                              );
 241         return;
 242     }
 243
 244     unsigned long keyMaskColor = 0;
 245     GdkPixmap* mask;
 246     if (bHasMask)
 247     {
 248         keyMaskColor = wxImageHistogram::MakeKey(
 249             image.GetMaskRed(), image.GetMaskGreen(), image.GetMaskBlue());
 250         // get mask before image is modified
 251         wxBitmap bitmap(image, 1);
 252         mask = bitmap.GetMask()->GetBitmap();
 253         g_object_ref(mask);
 254     }
 255     else
 256     {
 257         const int size = ((w + 7) / 8) * h;
 258         char* bits = new char[size];
 259         memset(bits, 0xff, size);
 260         mask = gdk_bitmap_create_from_data(
 261             wxGetRootWindow()->window, bits, w, h);
 262         delete[] bits;
 263     }
 264
 265     // modify image so wxBitmap can be used to convert to pixmap
 266     image_copy.SetMask(false);
 267     int i, j;
 268     wxByte* data = image_copy.GetData();
 269     for (j = 0; j < h; j++)
 270     {
 271         for (i = 0; i < w; i++, data += 3)
 272         {
 273             //if average value is > mid grey
 274             if (int(data[0]) + data[1] + data[2] >= 3 * 128)
 275             {
 276                 // wxBitmap only converts (255,255,255) to white
 277                 data[0] = 255;
 278                 data[1] = 255;
 279                 data[2] = 255;
 280             }
 281         }
 282     }
 283     wxBitmap bitmap(image_copy, 1);
 284
 285     // find the most frequent color(s)
 286     wxImageHistogram histogram;
 287     image.ComputeHistogram(histogram);
 288
 289     long colMostFreq = 0;
 290     unsigned long nMost = 0;
 291     long colNextMostFreq = 0;
 292     unsigned long nNext = 0;
 293     for ( wxImageHistogram::iterator entry = histogram.begin();
 294           entry != histogram.end();
 295           ++entry )
 296     {
 297         unsigned long key = entry->first;
 298         if ( !bHasMask || (key != keyMaskColor) )
 299         {
 300             unsigned long value = entry->second.value;
 301             if (value > nMost)
 302             {
 303                 nNext = nMost;
 304                 colNextMostFreq = colMostFreq;
 305                 nMost = value;
 306                 colMostFreq = key;
 307             }
 308             else if (value > nNext)
 309             {
 310                 nNext = value;
 311                 colNextMostFreq = key;
 312             }
 313         }
 314     }
 315
 316     wxColour fg = wxColour ( (unsigned char)(colMostFreq >> 16),
 317                              (unsigned char)(colMostFreq >> 8),
 318                              (unsigned char)(colMostFreq) );
 319
 320     wxColour bg = wxColour ( (unsigned char)(colNextMostFreq >> 16),
 321                              (unsigned char)(colNextMostFreq >> 8),
 322                              (unsigned char)(colNextMostFreq) );
 323
 324     int fg_intensity = fg.Red() + fg.Green() + fg.Blue();
 325     int bg_intensity = bg.Red() + bg.Green() + bg.Blue();
 326
 327     if (bg_intensity > fg_intensity)
 328     {
 329         //swap fg and bg
 330         wxColour tmp = fg;
 331         fg = bg;
 332         bg = tmp;
 333     }
 334
 335     M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixmap
 336                              (
 337                                 bitmap.GetPixmap(),
 338                                 mask,
 339                                 fg.GetColor(), bg.GetColor(),
 340                                 hotSpotX, hotSpotY
 341                              );
 342
 343     g_object_unref (mask);
 344 }
 345
 346 #endif // wxUSE_IMAGE
 347
 348 wxCursor::~wxCursor()
 349 {
 350 }
 351
 352 GdkCursor *wxCursor::GetCursor() const
 353 {
 354     return M_CURSORDATA->m_cursor;
 355 }
 356
 357 wxGDIRefData *wxCursor::CreateGDIRefData() const
 358 {
 359     return new wxCursorRefData;
 360 }
 361
 362 wxGDIRefData *wxCursor::CloneGDIRefData(const wxGDIRefData *data) const
 363 {
 364     return new wxCursorRefData(*static_cast<const wxCursorRefData *>(data));
 365 }
 366
 367 //-----------------------------------------------------------------------------
 368 // busy cursor routines
 369 //-----------------------------------------------------------------------------
 370
 371 /* Current cursor, in order to hang on to
 372  * cursor handle when setting the cursor globally */
 373 wxCursor g_globalCursor;
 374
 375 static wxCursor  gs_savedCursor;
 376 static int       gs_busyCount = 0;
 377
 378 const wxCursor &wxBusyCursor::GetStoredCursor()
 379 {
 380     return gs_savedCursor;
 381 }
 382
 383 const wxCursor wxBusyCursor::GetBusyCursor()
 384 {
 385     return wxCursor(wxCURSOR_WATCH);
 386 }
 387
 388 static void InternalIdle(const wxWindowList& list, GdkDisplay*& display)
 389 {
 390     wxWindowList::const_iterator i = list.begin();
 391     for (size_t n = list.size(); n--; ++i)
 392     {
 393         wxWindow* win = *i;
 394         if (display == NULL && win->m_widget && win->m_widget->window)
 395             display = gdk_drawable_get_display(win->m_widget->window);
 396         win->OnInternalIdle();
 397         InternalIdle(win->GetChildren(), display);
 398     }
 399 }
 400
 401 void wxEndBusyCursor()
 402 {
 403     if (--gs_busyCount > 0)
 404         return;
 405
 406     g_globalCursor = gs_savedCursor;
 407     gs_savedCursor = wxNullCursor;
 408     GdkDisplay* unused = NULL;
 409     InternalIdle(wxTopLevelWindows, unused);
 410 }
 411
 412 void wxBeginBusyCursor(const wxCursor* cursor)
 413 {
 414     if (gs_busyCount++ > 0)
 415         return;
 416
 417     wxASSERT_MSG( !gs_savedCursor.Ok(),
 418                   wxT("forgot to call wxEndBusyCursor, will leak memory") );
 419
 420     gs_savedCursor = g_globalCursor;
 421     g_globalCursor = *cursor;
 422     GdkDisplay* display = NULL;
 423     InternalIdle(wxTopLevelWindows, display);
 424     if (display)
 425         gdk_display_flush(display);
 426 }
 427
 428 bool wxIsBusy()
 429 {
 430     return gs_busyCount > 0;
 431 }
 432
 433 void wxSetCursor( const wxCursor& cursor )
 434 {
 435     g_globalCursor = cursor;
 436     wxTheApp->WakeUpIdle();
 437 }