+ /* Owen Taylor: "if the coordinates not in a drop zone,
+ return FALSE, otherwise call gtk_drag_status() and
+ return TRUE" */
+
+ /* inform the wxDropTarget about the current GdkDragContext.
+ this is only valid for the duration of this call */
+ drop_target->SetDragContext( context );
+
+ // GTK+ always supposes that we want to copy the data by default while we
+ // might want to move it, so examine not only suggested_action - which is
+ // only good if we don't have our own preferences - but also the actions
+ // field
+ wxDragResult result;
+ if (drop_target->GetDefaultAction() == wxDragNone)
+ {
+ // use default action set by wxDropSource::DoDragDrop()
+ if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
+ (context->actions & GDK_ACTION_MOVE ) )
+ {
+ // move is requested by the program and allowed by GTK+ - do it, even
+ // though suggested_action may be currently wxDragCopy
+ result = wxDragMove;
+ }
+ else // use whatever GTK+ says we should
+ {
+ result = ConvertFromGTK(context->suggested_action);
+
+ if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
+ {
+ // we're requested to move but we can't
+ result = wxDragCopy;
+ }
+ }
+ }
+ else if (drop_target->GetDefaultAction() == wxDragMove &&
+ (context->actions & GDK_ACTION_MOVE))
+ {
+ result = wxDragMove;
+ }
+ else
+ {
+ if (context->actions & GDK_ACTION_COPY)
+ result = wxDragCopy;
+ else if (context->actions & GDK_ACTION_MOVE)
+ result = wxDragMove;
+ else
+ result = wxDragNone;
+ }
+
+ if (drop_target->m_firstMotion)
+ {
+ /* the first "drag_motion" event substitutes a "drag_enter" event */
+ result = drop_target->OnEnter( x, y, result );
+ }
+ else
+ {
+ /* give program a chance to react (i.e. to say no by returning FALSE) */
+ result = drop_target->OnDragOver( x, y, result );
+ }
+
+ bool ret = wxIsDragResultOk( result );
+ if (ret)
+ {
+ GdkDragAction action;
+ if (result == wxDragCopy)
+ action = GDK_ACTION_COPY;
+ else if (result == wxDragLink)
+ action = GDK_ACTION_LINK;
+ else
+ action = GDK_ACTION_MOVE;
+
+ gdk_drag_status( context, action, time );
+ }
+
+ /* after this, invalidate the drop_target's GdkDragContext */
+ drop_target->SetDragContext( (GdkDragContext*) NULL );
+
+ /* this has to be done because GDK has no "drag_enter" event */
+ drop_target->m_firstMotion = false;
+
+ return ret;
+}
projects / wxWidgets.git / blobdiff