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 #include <wx/intl.h>
  18
  19 #include "gdk/gdkprivate.h"
  20
  21 #include <X11/Xlib.h>
  22
  23 // ----------------------------------------------------------------------------
  24 // global
  25 // ----------------------------------------------------------------------------
  26
  27 extern bool g_blockEventsOnDrag;
  28
  29 // ----------------------------------------------------------------------------
  30 // wxDropTarget
  31 // ----------------------------------------------------------------------------
  32
  33 wxDropTarget::wxDropTarget()
  34 {
  35 }
  36
  37 wxDropTarget::~wxDropTarget()
  38 {
  39 }
  40
  41 void wxDropTarget::Drop( GdkEvent *event, int x, int y )
  42 {
  43   printf( "Drop data is of type %s.\n", event->dropdataavailable.data_type );
  44
  45   OnDrop( x, y, (char *)event->dropdataavailable.data);
  46 }
  47
  48 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
  49 {
  50   if (!widget) return;
  51
  52   gtk_widget_dnd_drop_set( widget, FALSE, (gchar **) NULL, 0, FALSE );
  53 }
  54
  55 void wxDropTarget::RegisterWidget( GtkWidget *widget )
  56 {
  57   wxString formats;
  58   int valid = 0;
  59
  60   for ( size_t i = 0; i < GetFormatCount(); i++ )
  61   {
  62     wxDataFormat df = GetFormat( i );
  63     switch (df)
  64     {
  65       case wxDF_TEXT:
  66         if (i > 0) formats += ";";
  67         formats += "text/plain";
  68         valid++;
  69         break;
  70       case wxDF_FILENAME:
  71         if (i > 0) formats += ";";
  72         formats += "url:any";
  73         valid++;
  74         break;
  75       default:
  76         break;
  77     }
  78   }
  79
  80   char *str = WXSTRINGCAST formats;
  81
  82   gtk_widget_dnd_drop_set( widget, TRUE, &str, valid, FALSE );
  83 }
  84
  85 // ----------------------------------------------------------------------------
  86 // wxTextDropTarget
  87 // ----------------------------------------------------------------------------
  88
  89 bool wxTextDropTarget::OnDrop( long x, long y, const void *pData )
  90 {
  91   OnDropText( x, y, (const char*)pData );
  92   return TRUE;
  93 }
  94
  95 bool wxTextDropTarget::OnDropText( long x, long y, const char *psz )
  96 {
  97   printf( "Got dropped text: %s.\n", psz );
  98   printf( "At x: %d, y: %d.\n", (int)x, (int)y );
  99   return TRUE;
 100 }
 101
 102 size_t wxTextDropTarget::GetFormatCount() const
 103 {
 104   return 1;
 105 }
 106
 107 wxDataFormat wxTextDropTarget::GetFormat(size_t WXUNUSED(n)) const
 108 {
 109   return wxDF_TEXT;
 110 }
 111
 112 // ----------------------------------------------------------------------------
 113 // wxFileDropTarget
 114 // ----------------------------------------------------------------------------
 115
 116 bool wxFileDropTarget::OnDropFiles( long x, long y, size_t nFiles, const char * const WXUNUSED(aszFiles)[] )
 117 {
 118   printf( "Got %d dropped files.\n", (int)nFiles );
 119   printf( "At x: %d, y: %d.\n", (int)x, (int)y );
 120   return TRUE;
 121 }
 122
 123 bool wxFileDropTarget::OnDrop(long x, long y, const void *WXUNUSED(pData) )
 124 {
 125   char *str = "/this/is/a/path.txt";
 126
 127   return OnDropFiles(x, y, 1, &str );
 128 }
 129
 130 size_t wxFileDropTarget::GetFormatCount() const
 131 {
 132   return 1;
 133 }
 134
 135 wxDataFormat wxFileDropTarget::GetFormat(size_t WXUNUSED(n)) const
 136 {
 137   return wxDF_FILENAME;
 138 }
 139
 140 //-------------------------------------------------------------------------
 141 // wxDropSource
 142 //-------------------------------------------------------------------------
 143
 144 //-----------------------------------------------------------------------------
 145 // drag request
 146
 147 void gtk_drag_callback( GtkWidget *widget, GdkEvent *event, wxDropSource *source )
 148 {
 149   printf( "Data requested for dropping.\n" );
 150
 151   wxDataObject *data = source->m_data;
 152
 153   size_t size = data->GetDataSize();
 154   char *ptr = new char[size];
 155   data->GetDataHere( ptr );
 156
 157   gtk_widget_dnd_data_set( widget, event, ptr, size );
 158
 159   delete ptr;
 160
 161   source->m_retValue = wxDropSource::Copy;
 162 }
 163
 164 wxDropSource::wxDropSource( wxWindow *win )
 165 {
 166   g_blockEventsOnDrag = TRUE;
 167
 168   m_window = win;
 169   m_widget = win->m_widget;
 170   if (win->m_wxwindow) m_widget = win->m_wxwindow;
 171
 172   m_data = (wxDataObject *) NULL;
 173   m_retValue = Cancel;
 174
 175   m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 176   m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 177 }
 178
 179 wxDropSource::wxDropSource( wxDataObject &data, wxWindow *win )
 180 {
 181   g_blockEventsOnDrag = TRUE;
 182
 183   m_window = win;
 184   m_widget = win->m_widget;
 185   if (win->m_wxwindow) m_widget = win->m_wxwindow;
 186   m_retValue = Cancel;
 187
 188   m_data = &data;
 189
 190   m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 191   m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 192 }
 193
 194 void wxDropSource::SetData( wxDataObject &data )
 195 {
 196   m_data = &data;
 197 }
 198
 199 wxDropSource::~wxDropSource(void)
 200 {
 201 //  if (m_data) delete m_data;
 202
 203   g_blockEventsOnDrag = FALSE;
 204 }
 205
 206 wxDropSource::DragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 207 {
 208   if (gdk_dnd.dnd_grabbed) return (wxDropSource::DragResult) None;
 209   if (gdk_dnd.drag_really) return (wxDropSource::DragResult) None;
 210
 211   wxASSERT_MSG( m_data, "wxDragSource: no data" );
 212
 213   if (!m_data) return (wxDropSource::DragResult) None;
 214   if (m_data->GetDataSize() == 0) return (wxDropSource::DragResult) None;
 215
 216   GdkWindowPrivate *wp = (GdkWindowPrivate*) m_widget->window;
 217
 218   RegisterWindow();
 219
 220   gdk_dnd.drag_perhaps = TRUE;
 221
 222   gdk_dnd.dnd_drag_start.x = 5;
 223   gdk_dnd.dnd_drag_start.y = 5;
 224   gdk_dnd.real_sw = wp;
 225
 226   if (gdk_dnd.drag_startwindows)
 227   {
 228     g_free( gdk_dnd.drag_startwindows );
 229     gdk_dnd.drag_startwindows = (GdkWindow **) NULL;
 230   }
 231   gdk_dnd.drag_numwindows = gdk_dnd.drag_really = 0;
 232
 233   XWindowAttributes dnd_winattr;
 234   XGetWindowAttributes( gdk_display, wp->xwindow, &dnd_winattr );
 235   wp->dnd_drag_savedeventmask = dnd_winattr.your_event_mask;
 236
 237   gdk_dnd_drag_addwindow( m_widget->window );
 238
 239   GdkEventDragBegin ev;
 240   ev.type = GDK_DRAG_BEGIN;
 241   ev.window = m_widget->window;
 242   ev.u.allflags = 0;
 243   ev.u.flags.protocol_version = DND_PROTOCOL_VERSION;
 244
 245   gdk_event_put( (GdkEvent*)&ev );
 246
 247   XGrabPointer( gdk_display, wp->xwindow, False,
 248                 ButtonMotionMask | ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
 249                 GrabModeAsync, GrabModeAsync, gdk_root_window, None, CurrentTime );
 250
 251   gdk_dnd_set_drag_cursors( m_defaultCursor.GetCursor(), m_goaheadCursor.GetCursor() );
 252
 253   gdk_dnd.dnd_grabbed = TRUE;
 254   gdk_dnd.drag_really = 1;
 255
 256   int x = 0;
 257   int y = 0;
 258   gdk_window_get_pointer( m_widget->window, &x, &y, (GdkModifierType *) NULL );
 259
 260   gdk_dnd_display_drag_cursor( x, y, FALSE, TRUE );
 261
 262   while (gdk_dnd.drag_really || gdk_dnd.drag_perhaps) wxYield();
 263
 264   UnregisterWindow();
 265
 266   g_blockEventsOnDrag = FALSE;
 267
 268   return m_retValue;
 269 }
 270
 271 void wxDropSource::RegisterWindow(void)
 272 {
 273   if (!m_data) return;
 274
 275   wxString formats;
 276
 277   wxDataFormat df = m_data->GetPreferredFormat();
 278
 279     switch (df)
 280     {
 281       case wxDF_TEXT:
 282         formats += "text/plain";
 283         break;
 284       case wxDF_FILENAME:
 285         formats += "url:any";
 286         break;
 287       default:
 288         break;
 289     }
 290
 291   char *str = WXSTRINGCAST formats;
 292
 293   gtk_widget_dnd_drag_set( m_widget, TRUE, &str, 1 );
 294
 295   gtk_signal_connect( GTK_OBJECT(m_widget), "drag_request_event",
 296     GTK_SIGNAL_FUNC(gtk_drag_callback), (gpointer)this );
 297 }
 298
 299 void wxDropSource::UnregisterWindow(void)
 300 {
 301   if (!m_widget) return;
 302
 303   gtk_widget_dnd_drag_set( m_widget, FALSE, (gchar **) NULL, 0 );
 304
 305   gtk_signal_disconnect_by_data( GTK_OBJECT(m_widget), (gpointer)this );
 306 }