src/gtk/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dnd.cpp
   3 // Purpose:     wxDropTarget class
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 #ifdef __GNUG__
  11 #pragma implementation "dnd.h"
  12 #endif
  13
  14 #include "wx/dnd.h"
  15 #include "wx/window.h"
  16 #include "wx/app.h"
  17 #include "wx/gdicmn.h"
  18 #include <wx/intl.h>
  19
  20 #include "gdk/gdkprivate.h"
  21
  22 #include <X11/Xlib.h>
  23
  24 // ----------------------------------------------------------------------------
  25 // global
  26 // ----------------------------------------------------------------------------
  27
  28 extern bool g_blockEventsOnDrag;
  29
  30 // ----------------------------------------------------------------------------
  31 // wxDropTarget
  32 // ----------------------------------------------------------------------------
  33
  34 wxDropTarget::wxDropTarget()
  35 {
  36   m_size = 0;
  37 }
  38
  39 wxDropTarget::~wxDropTarget()
  40 {
  41 }
  42
  43 void wxDropTarget::Drop( GdkEventDropDataAvailable *event, int x, int y )
  44 {
  45   printf( "Drop data is of type %s.\n", event->data_type );
  46
  47   OnDrop( x, y, (char *)event->data);
  48 }
  49
  50 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
  51 {
  52   if (!widget) return;
  53
  54   gtk_widget_dnd_drop_set( widget, FALSE, (gchar **) NULL, 0, FALSE );
  55 }
  56
  57 void wxDropTarget::RegisterWidget( GtkWidget *widget )
  58 {
  59   wxString formats;
  60   int valid = 0;
  61
  62   for ( size_t i = 0; i < GetFormatCount(); i++ )
  63   {
  64     wxDataFormat df = GetFormat( i );
  65     switch (df)
  66     {
  67       case wxDF_TEXT:
  68         if (i > 0) formats += ";";
  69         formats += "text/plain";
  70         valid++;
  71         break;
  72       case wxDF_FILENAME:
  73         if (i > 0) formats += ";";
  74         formats += "file:ALL";
  75         valid++;
  76         break;
  77       default:
  78         break;
  79     }
  80   }
  81
  82   char *str = WXSTRINGCAST formats;
  83
  84   gtk_widget_dnd_drop_set( widget, TRUE, &str, valid, FALSE );
  85 }
  86
  87 // ----------------------------------------------------------------------------
  88 // wxTextDropTarget
  89 // ----------------------------------------------------------------------------
  90
  91 bool wxTextDropTarget::OnDrop( long x, long y, const void *pData )
  92 {
  93   OnDropText( x, y, (const char*)pData );
  94   return TRUE;
  95 }
  96
  97 bool wxTextDropTarget::OnDropText( long x, long y, const char *psz )
  98 {
  99   printf( "Got dropped text: %s.\n", psz );
 100   printf( "At x: %d, y: %d.\n", (int)x, (int)y );
 101   return TRUE;
 102 }
 103
 104 size_t wxTextDropTarget::GetFormatCount() const
 105 {
 106   return 1;
 107 }
 108
 109 wxDataFormat wxTextDropTarget::GetFormat(size_t WXUNUSED(n)) const
 110 {
 111   return wxDF_TEXT;
 112 }
 113
 114 // ----------------------------------------------------------------------------
 115 // wxFileDropTarget
 116 // ----------------------------------------------------------------------------
 117
 118 bool wxFileDropTarget::OnDropFiles( long x, long y, size_t nFiles, const char * const aszFiles[] )
 119 {
 120   printf( "Got %d dropped files.\n", (int)nFiles );
 121   printf( "At x: %d, y: %d.\n", (int)x, (int)y );
 122   for (size_t i = 0; i < nFiles; i++)
 123   {
 124     printf( aszFiles[i] );
 125     printf( "\n" );
 126   }
 127   return TRUE;
 128 }
 129
 130 bool wxFileDropTarget::OnDrop(long x, long y, const void *pData )
 131 {
 132   size_t number = 0;
 133   char *text = (char*) pData;
 134   for (int i = 0; i < m_size; i++)
 135     if (text[i] == 0) number++;
 136
 137   if (number == 0) return TRUE;
 138
 139   char **files = new char*[number];
 140
 141   text = (char*) pData;
 142   for (size_t i = 0; i < number; i++)
 143   {
 144     files[i] = text;
 145     int len = strlen( text );
 146     text += len+1;
 147   }
 148
 149   bool ret = OnDropFiles(x, y, 1, files );
 150
 151   free( files );
 152
 153   return ret;
 154 }
 155
 156 size_t wxFileDropTarget::GetFormatCount() const
 157 {
 158   return 1;
 159 }
 160
 161 wxDataFormat wxFileDropTarget::GetFormat(size_t WXUNUSED(n)) const
 162 {
 163   return wxDF_FILENAME;
 164 }
 165
 166 //-------------------------------------------------------------------------
 167 // wxDropSource
 168 //-------------------------------------------------------------------------
 169
 170 //-----------------------------------------------------------------------------
 171 // drag request
 172
 173 void gtk_drag_callback( GtkWidget *widget, GdkEvent *event, wxDropSource *source )
 174 {
 175   printf( "Data requested for dropping.\n" );
 176
 177   wxDataObject *data = source->m_data;
 178
 179   size_t size = data->GetDataSize();
 180   char *ptr = new char[size];
 181   data->GetDataHere( ptr );
 182
 183   gtk_widget_dnd_data_set( widget, event, ptr, size );
 184
 185   delete ptr;
 186
 187   source->m_retValue = wxDragCopy;
 188 }
 189
 190 wxDropSource::wxDropSource( wxWindow *win )
 191 {
 192   g_blockEventsOnDrag = TRUE;
 193
 194   m_window = win;
 195   m_widget = win->m_widget;
 196   if (win->m_wxwindow) m_widget = win->m_wxwindow;
 197
 198   m_data = (wxDataObject *) NULL;
 199   m_retValue = wxDragCancel;
 200
 201   m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 202   m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 203 }
 204
 205 wxDropSource::wxDropSource( wxDataObject &data, wxWindow *win )
 206 {
 207   g_blockEventsOnDrag = TRUE;
 208
 209   m_window = win;
 210   m_widget = win->m_widget;
 211   if (win->m_wxwindow) m_widget = win->m_wxwindow;
 212   m_retValue = wxDragCancel;
 213
 214   m_data = &data;
 215
 216   m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 217   m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 218 }
 219
 220 void wxDropSource::SetData( wxDataObject &data )
 221 {
 222   m_data = &data;
 223 }
 224
 225 wxDropSource::~wxDropSource(void)
 226 {
 227 //  if (m_data) delete m_data;
 228
 229   g_blockEventsOnDrag = FALSE;
 230 }
 231
 232 wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 233 {
 234   if (gdk_dnd.dnd_grabbed) return (wxDragResult) wxDragNone;
 235   if (gdk_dnd.drag_really) return (wxDragResult) wxDragNone;
 236
 237   wxASSERT_MSG( m_data, "wxDragSource: no data" );
 238
 239   if (!m_data) return (wxDragResult) wxDragNone;
 240   if (m_data->GetDataSize() == 0) return (wxDragResult) wxDragNone;
 241
 242   GdkWindowPrivate *wp = (GdkWindowPrivate*) m_widget->window;
 243
 244   RegisterWindow();
 245
 246   gdk_dnd.drag_perhaps = TRUE;
 247
 248   gdk_dnd.dnd_drag_start.x = 5;
 249   gdk_dnd.dnd_drag_start.y = 5;
 250   gdk_dnd.real_sw = wp;
 251
 252   if (gdk_dnd.drag_startwindows)
 253   {
 254     g_free( gdk_dnd.drag_startwindows );
 255     gdk_dnd.drag_startwindows = (GdkWindow **) NULL;
 256   }
 257   gdk_dnd.drag_numwindows = gdk_dnd.drag_really = 0;
 258
 259   XWindowAttributes dnd_winattr;
 260   XGetWindowAttributes( gdk_display, wp->xwindow, &dnd_winattr );
 261   wp->dnd_drag_savedeventmask = dnd_winattr.your_event_mask;
 262
 263   gdk_dnd_drag_addwindow( m_widget->window );
 264
 265   GdkEventDragBegin ev;
 266   ev.type = GDK_DRAG_BEGIN;
 267   ev.window = m_widget->window;
 268   ev.u.allflags = 0;
 269   ev.u.flags.protocol_version = DND_PROTOCOL_VERSION;
 270
 271   gdk_event_put( (GdkEvent*)&ev );
 272
 273   XGrabPointer( gdk_display, wp->xwindow, False,
 274                 ButtonMotionMask | ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
 275                 GrabModeAsync, GrabModeAsync, gdk_root_window, None, CurrentTime );
 276
 277   gdk_dnd_set_drag_cursors( m_defaultCursor.GetCursor(), m_goaheadCursor.GetCursor() );
 278
 279   gdk_dnd.dnd_grabbed = TRUE;
 280   gdk_dnd.drag_really = 1;
 281
 282   int x = 0;
 283   int y = 0;
 284   gdk_window_get_pointer( m_widget->window, &x, &y, (GdkModifierType *) NULL );
 285
 286   gdk_dnd_display_drag_cursor( x, y, FALSE, TRUE );
 287
 288   while (gdk_dnd.drag_really || gdk_dnd.drag_perhaps) wxYield();
 289
 290   UnregisterWindow();
 291
 292   g_blockEventsOnDrag = FALSE;
 293
 294   return m_retValue;
 295 }
 296
 297 void wxDropSource::RegisterWindow(void)
 298 {
 299   if (!m_data) return;
 300
 301   wxString formats;
 302
 303   wxDataFormat df = m_data->GetPreferredFormat();
 304
 305     switch (df)
 306     {
 307       case wxDF_TEXT:
 308         formats += "text/plain";
 309         break;
 310       case wxDF_FILENAME:
 311         formats += "file:ALL";
 312         break;
 313       default:
 314         break;
 315     }
 316
 317   char *str = WXSTRINGCAST formats;
 318
 319   gtk_widget_dnd_drag_set( m_widget, TRUE, &str, 1 );
 320
 321   gtk_signal_connect( GTK_OBJECT(m_widget), "drag_request_event",
 322     GTK_SIGNAL_FUNC(gtk_drag_callback), (gpointer)this );
 323 }
 324
 325 void wxDropSource::UnregisterWindow(void)
 326 {
 327   if (!m_widget) return;
 328
 329   gtk_widget_dnd_drag_set( m_widget, FALSE, (gchar **) NULL, 0 );
 330
 331   gtk_signal_disconnect_by_data( GTK_OBJECT(m_widget), (gpointer)this );
 332 }