src/gtk/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dnd.cpp
   3 // Purpose:     wxDropTarget class
   4 // Author:      Robert Roebling
   5 // Copyright:   Robert Roebling
   6 // Licence:     wxWindows license
   7 ///////////////////////////////////////////////////////////////////////////////
   8
   9 #ifdef __GNUG__
  10 #pragma implementation "dnd.h"
  11 #endif
  12
  13 #include "wx/dnd.h"
  14 #include "wx/window.h"
  15 #include "wx/app.h"
  16 #include "wx/gdicmn.h"
  17
  18 #include "gdk/gdkprivate.h"
  19
  20 #include <X11/Xlib.h>
  21
  22 // ----------------------------------------------------------------------------
  23 // global
  24 // ----------------------------------------------------------------------------
  25
  26 extern bool g_blockEventsOnDrag;
  27
  28 // ----------------------------------------------------------------------------
  29 // wxDropTarget
  30 // ----------------------------------------------------------------------------
  31
  32 wxDropTarget::wxDropTarget()
  33 {
  34 };
  35
  36 wxDropTarget::~wxDropTarget()
  37 {
  38 };
  39
  40 void wxDropTarget::Drop( GdkEvent *event, int x, int y )
  41 {
  42   printf( "Drop data is of type %s.\n", event->dropdataavailable.data_type );
  43
  44   OnDrop( x, y, (char *)event->dropdataavailable.data);
  45 };
  46
  47 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
  48 {
  49   if (!widget) return;
  50
  51   gtk_widget_dnd_drop_set( widget, FALSE, NULL, 0, FALSE );
  52 };
  53
  54 void wxDropTarget::RegisterWidget( GtkWidget *widget )
  55 {
  56   wxString formats;
  57   int valid = 0;
  58
  59   for ( uint i = 0; i < GetFormatCount(); i++ )
  60   {
  61     wxDataFormat df = GetFormat( i );
  62     switch (df)
  63     {
  64       case wxDF_TEXT:
  65         if (i > 0) formats += ";";
  66         formats += "text/plain";
  67         valid++;
  68         break;
  69       case wxDF_FILENAME:
  70         if (i > 0) formats += ";";
  71         formats += "url:any";
  72         valid++;
  73         break;
  74       default:
  75         break;
  76     };
  77   }
  78
  79   char *str = WXSTRINGCAST formats;
  80
  81   gtk_widget_dnd_drop_set( widget, TRUE, &str, valid, FALSE );
  82 };
  83
  84 // ----------------------------------------------------------------------------
  85 // wxTextDropTarget
  86 // ----------------------------------------------------------------------------
  87
  88 bool wxTextDropTarget::OnDrop( long x, long y, const void *pData )
  89 {
  90   OnDropText( x, y, (const char*)pData );
  91   return TRUE;
  92 };
  93
  94 bool wxTextDropTarget::OnDropText( long x, long y, const char *psz )
  95 {
  96   printf( "Got dropped text: %s.\n", psz );
  97   printf( "At x: %d, y: %d.\n", (int)x, (int)y );
  98   return TRUE;
  99 };
 100
 101 size_t wxTextDropTarget::GetFormatCount() const
 102 {
 103   return 1;
 104 }
 105
 106 wxDataFormat wxTextDropTarget::GetFormat(size_t WXUNUSED(n)) const
 107 {
 108   return wxDF_TEXT;
 109 }
 110
 111 // ----------------------------------------------------------------------------
 112 // wxFileDropTarget
 113 // ----------------------------------------------------------------------------
 114
 115 bool wxFileDropTarget::OnDropFiles( long x, long y, size_t nFiles, const char * const WXUNUSED(aszFiles)[] )
 116 {
 117   printf( "Got %d dropped files.\n", (int)nFiles );
 118   printf( "At x: %d, y: %d.\n", (int)x, (int)y );
 119   return TRUE;
 120 }
 121
 122 bool wxFileDropTarget::OnDrop(long x, long y, const void *WXUNUSED(pData) )
 123 {
 124   char *str = "/this/is/a/path.txt";
 125
 126   return OnDropFiles(x, y, 1, &str );
 127 }
 128
 129 size_t wxFileDropTarget::GetFormatCount() const
 130 {
 131   return 1;
 132 }
 133
 134 wxDataFormat wxFileDropTarget::GetFormat(size_t WXUNUSED(n)) const
 135 {
 136   return wxDF_FILENAME;
 137 }
 138
 139 //-------------------------------------------------------------------------
 140 // wxDropSource
 141 //-------------------------------------------------------------------------
 142
 143 //-----------------------------------------------------------------------------
 144 // drag request
 145
 146 void gtk_drag_callback( GtkWidget *widget, GdkEvent *event, wxDataObject *data )
 147 {
 148   printf( "Data requested for dropping.\n" );
 149
 150   uint size = data->GetDataSize();
 151   char *ptr = new char[size];
 152   data->GetDataHere( ptr );
 153
 154   gtk_widget_dnd_data_set( widget, event, ptr, size );
 155
 156   delete ptr;
 157 };
 158
 159 wxDropSource::wxDropSource( wxWindow *win )
 160 {
 161   g_blockEventsOnDrag = TRUE;
 162
 163   m_window = win;
 164   m_widget = win->m_widget;
 165   if (win->m_wxwindow) m_widget = win->m_wxwindow;
 166
 167   m_data = NULL;
 168
 169   m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 170   m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 171 };
 172
 173 wxDropSource::wxDropSource( wxDataObject &data, wxWindow *win )
 174 {
 175   g_blockEventsOnDrag = TRUE;
 176
 177   m_window = win;
 178   m_widget = win->m_widget;
 179   if (win->m_wxwindow) m_widget = win->m_wxwindow;
 180
 181   m_data = &data;
 182
 183   m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 184   m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 185 };
 186
 187 void wxDropSource::SetData( wxDataObject &data )
 188 {
 189   m_data = &data;
 190 };
 191
 192 wxDropSource::~wxDropSource(void)
 193 {
 194 //  if (m_data) delete m_data;
 195
 196   g_blockEventsOnDrag = FALSE;
 197 };
 198
 199 wxDropSource::DragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 200 {
 201   if (gdk_dnd.dnd_grabbed) return None;
 202   if (gdk_dnd.drag_really) return None;
 203
 204   if (!m_data) return None;
 205   if (m_data->GetDataSize() == 0) return None;
 206
 207   GdkWindowPrivate *wp = (GdkWindowPrivate*) m_widget->window;
 208
 209   RegisterWindow();
 210
 211   gdk_dnd.drag_perhaps = TRUE;
 212
 213   gdk_dnd.dnd_drag_start.x = 5;
 214   gdk_dnd.dnd_drag_start.y = 5;
 215   gdk_dnd.real_sw = wp;
 216
 217   if (gdk_dnd.drag_startwindows)
 218   {
 219     g_free( gdk_dnd.drag_startwindows );
 220     gdk_dnd.drag_startwindows = NULL;
 221   };
 222   gdk_dnd.drag_numwindows = gdk_dnd.drag_really = 0;
 223
 224   XWindowAttributes dnd_winattr;
 225   XGetWindowAttributes( gdk_display, wp->xwindow, &dnd_winattr );
 226   wp->dnd_drag_savedeventmask = dnd_winattr.your_event_mask;
 227
 228   gdk_dnd_drag_addwindow( m_widget->window );
 229
 230   GdkEventDragBegin ev;
 231   ev.type = GDK_DRAG_BEGIN;
 232   ev.window = m_widget->window;
 233   ev.u.allflags = 0;
 234   ev.u.flags.protocol_version = DND_PROTOCOL_VERSION;
 235
 236   gdk_event_put( (GdkEvent*)&ev );
 237
 238   XGrabPointer( gdk_display, wp->xwindow, False,
 239                 ButtonMotionMask | ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
 240                 GrabModeAsync, GrabModeAsync, gdk_root_window, None, CurrentTime );
 241
 242   gdk_dnd_set_drag_cursors( m_defaultCursor.GetCursor(), m_goaheadCursor.GetCursor() );
 243
 244   gdk_dnd.dnd_grabbed = TRUE;
 245   gdk_dnd.drag_really = 1;
 246
 247   int x = 0;
 248   int y = 0;
 249   gdk_window_get_pointer( m_widget->window, &x, &y, NULL );
 250
 251   gdk_dnd_display_drag_cursor( x, y, FALSE, TRUE );
 252
 253   while (gdk_dnd.drag_really || gdk_dnd.drag_perhaps) wxYield();
 254
 255   UnregisterWindow();
 256
 257   return Copy;
 258 };
 259
 260 void wxDropSource::RegisterWindow(void)
 261 {
 262   if (!m_data) return;
 263
 264   wxString formats;
 265
 266   wxDataFormat df = m_data->GetPreferredFormat();
 267
 268     switch (df)
 269     {
 270       case wxDF_TEXT:
 271         formats += "text/plain";
 272         break;
 273       case wxDF_FILENAME:
 274         formats += "url:any";
 275         break;
 276       default:
 277         break;
 278     }
 279
 280   char *str = WXSTRINGCAST formats;
 281
 282   gtk_widget_dnd_drag_set( m_widget, TRUE, &str, 1 );
 283
 284   gtk_signal_connect( GTK_OBJECT(m_widget), "drag_request_event",
 285     GTK_SIGNAL_FUNC(gtk_drag_callback), (gpointer)m_data );
 286 };
 287
 288 void wxDropSource::UnregisterWindow(void)
 289 {
 290   if (!m_widget) return;
 291
 292   gtk_widget_dnd_drag_set( m_widget, FALSE, NULL, 0 );
 293
 294   gtk_signal_disconnect_by_data( GTK_OBJECT(m_widget), (gpointer)m_data );
 295 };