src/gtk1/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, NULL, 0, FALSE );
  53 };
  54
  55 void wxDropTarget::RegisterWidget( GtkWidget *widget )
  56 {
  57   wxString formats;
  58   int valid = 0;
  59
  60   for ( uint 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, wxDataObject *data )
 148 {
 149   printf( "Data requested for dropping.\n" );
 150
 151   uint size = data->GetDataSize();
 152   char *ptr = new char[size];
 153   data->GetDataHere( ptr );
 154
 155   gtk_widget_dnd_data_set( widget, event, ptr, size );
 156
 157   delete ptr;
 158 };
 159
 160 wxDropSource::wxDropSource( wxWindow *win )
 161 {
 162   g_blockEventsOnDrag = TRUE;
 163
 164   m_window = win;
 165   m_widget = win->m_widget;
 166   if (win->m_wxwindow) m_widget = win->m_wxwindow;
 167
 168   m_data = NULL;
 169
 170   m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 171   m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 172 };
 173
 174 wxDropSource::wxDropSource( wxDataObject &data, wxWindow *win )
 175 {
 176   g_blockEventsOnDrag = TRUE;
 177
 178   m_window = win;
 179   m_widget = win->m_widget;
 180   if (win->m_wxwindow) m_widget = win->m_wxwindow;
 181
 182   m_data = &data;
 183
 184   m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 185   m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 186 };
 187
 188 void wxDropSource::SetData( wxDataObject &data )
 189 {
 190   m_data = &data;
 191 };
 192
 193 wxDropSource::~wxDropSource(void)
 194 {
 195 //  if (m_data) delete m_data;
 196
 197   g_blockEventsOnDrag = FALSE;
 198 };
 199
 200 wxDropSource::DragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 201 {
 202   if (gdk_dnd.dnd_grabbed) return None;
 203   if (gdk_dnd.drag_really) return None;
 204
 205   if (!m_data) return None;
 206   if (m_data->GetDataSize() == 0) return None;
 207
 208   GdkWindowPrivate *wp = (GdkWindowPrivate*) m_widget->window;
 209
 210   RegisterWindow();
 211
 212   gdk_dnd.drag_perhaps = TRUE;
 213
 214   gdk_dnd.dnd_drag_start.x = 5;
 215   gdk_dnd.dnd_drag_start.y = 5;
 216   gdk_dnd.real_sw = wp;
 217
 218   if (gdk_dnd.drag_startwindows)
 219   {
 220     g_free( gdk_dnd.drag_startwindows );
 221     gdk_dnd.drag_startwindows = NULL;
 222   };
 223   gdk_dnd.drag_numwindows = gdk_dnd.drag_really = 0;
 224
 225   XWindowAttributes dnd_winattr;
 226   XGetWindowAttributes( gdk_display, wp->xwindow, &dnd_winattr );
 227   wp->dnd_drag_savedeventmask = dnd_winattr.your_event_mask;
 228
 229   gdk_dnd_drag_addwindow( m_widget->window );
 230
 231   GdkEventDragBegin ev;
 232   ev.type = GDK_DRAG_BEGIN;
 233   ev.window = m_widget->window;
 234   ev.u.allflags = 0;
 235   ev.u.flags.protocol_version = DND_PROTOCOL_VERSION;
 236
 237   gdk_event_put( (GdkEvent*)&ev );
 238
 239   XGrabPointer( gdk_display, wp->xwindow, False,
 240                 ButtonMotionMask | ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
 241                 GrabModeAsync, GrabModeAsync, gdk_root_window, None, CurrentTime );
 242
 243   gdk_dnd_set_drag_cursors( m_defaultCursor.GetCursor(), m_goaheadCursor.GetCursor() );
 244
 245   gdk_dnd.dnd_grabbed = TRUE;
 246   gdk_dnd.drag_really = 1;
 247
 248   int x = 0;
 249   int y = 0;
 250   gdk_window_get_pointer( m_widget->window, &x, &y, NULL );
 251
 252   gdk_dnd_display_drag_cursor( x, y, FALSE, TRUE );
 253
 254   while (gdk_dnd.drag_really || gdk_dnd.drag_perhaps) wxYield();
 255
 256   UnregisterWindow();
 257
 258   return Copy;
 259 };
 260
 261 void wxDropSource::RegisterWindow(void)
 262 {
 263   if (!m_data) return;
 264
 265   wxString formats;
 266
 267   wxDataFormat df = m_data->GetPreferredFormat();
 268
 269     switch (df)
 270     {
 271       case wxDF_TEXT:
 272         formats += "text/plain";
 273         break;
 274       case wxDF_FILENAME:
 275         formats += "url:any";
 276         break;
 277       default:
 278         break;
 279     }
 280
 281   char *str = WXSTRINGCAST formats;
 282
 283   gtk_widget_dnd_drag_set( m_widget, TRUE, &str, 1 );
 284
 285   gtk_signal_connect( GTK_OBJECT(m_widget), "drag_request_event",
 286     GTK_SIGNAL_FUNC(gtk_drag_callback), (gpointer)m_data );
 287 };
 288
 289 void wxDropSource::UnregisterWindow(void)
 290 {
 291   if (!m_widget) return;
 292
 293   gtk_widget_dnd_drag_set( m_widget, FALSE, NULL, 0 );
 294
 295   gtk_signal_disconnect_by_data( GTK_OBJECT(m_widget), (gpointer)m_data );
 296 };