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