+/*
+ Copyright (C) 2000-2007 Paul Davis
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
#ifndef __gtkmm2ext_dndtreeview_h__
#define __gtkmm2ext_dndtreeview_h__
namespace Gtkmm2ext {
-class DnDTreeView : public Gtk::TreeView
-{
+template<class DataType>
+struct SerializedObjectPointers {
+ uint32_t size;
+ uint32_t cnt;
+ char type[32];
+ DataType data[0];
+};
+class DnDTreeViewBase : public Gtk::TreeView
+{
private:
public:
- DnDTreeView ();
- ~DnDTreeView() {}
+ DnDTreeViewBase ();
+ ~DnDTreeViewBase() {}
- /* this is the structure pointed to if add_object_drag() is called
- and a drop happens on a destination which has declared itself
- willing to accept a target of the type named in the call
- to add_object_drag().
- */
-
- struct SerializedObjectPointers {
- uint32_t size;
- uint32_t cnt;
- char type[32];
- void* ptr[0];
- };
-
void add_drop_targets (std::list<Gtk::TargetEntry>&);
void add_object_drag (int column, std::string type_name);
- sigc::signal<void,std::string,uint32_t,void**> signal_object_drop;
-
- void on_drag_begin(const Glib::RefPtr<Gdk::DragContext>& context) {
- TreeView::on_drag_begin (context);
- }
- void on_drag_end(const Glib::RefPtr<Gdk::DragContext>& context) {
- TreeView::on_drag_end (context);
- }
- void on_drag_data_delete(const Glib::RefPtr<Gdk::DragContext>& context) {
- TreeView::on_drag_data_delete (context);
+
+ void on_drag_begin (Glib::RefPtr<Gdk::DragContext> const & context) {
+ Gtk::TreeView::on_drag_begin (context);
+ start_object_drag ();
}
+
void on_drag_leave(const Glib::RefPtr<Gdk::DragContext>& context, guint time) {
- suggested_action = context->get_suggested_action();
- TreeView::on_drag_leave (context, time);
+ suggested_action = context->get_suggested_action();
+ TreeView::on_drag_leave (context, time);
}
+
bool on_drag_motion(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, guint time) {
suggested_action = context->get_suggested_action();
return TreeView::on_drag_motion (context, x, y, time);
}
+
bool on_drag_drop(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, guint time);
- void on_drag_data_get(const Glib::RefPtr<Gdk::DragContext>& context, Gtk::SelectionData& selection_data, guint info, guint time);
- void on_drag_data_received(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, const Gtk::SelectionData& selection_data, guint info, guint time);
- private:
+ protected:
std::list<Gtk::TargetEntry> draggable;
Gdk::DragAction suggested_action;
int data_column;
+ std::string object_type;
+
+ struct DragData {
+ DragData () : source (0) {}
+
+ Gtk::TreeView* source;
+ int data_column;
+ std::string object_type;
+ };
- SerializedObjectPointers* serialize_pointers (Glib::RefPtr<Gtk::TreeModel> m,
- Gtk::TreeSelection::ListHandle_Path*,
- Glib::ustring type);
+ static DragData drag_data;
+
+ void start_object_drag () {
+ drag_data.source = this;
+ drag_data.data_column = data_column;
+ drag_data.object_type = object_type;
+ }
+};
+
+template<class DataType>
+class DnDTreeView : public DnDTreeViewBase
+{
+ public:
+ DnDTreeView() {}
+ ~DnDTreeView() {}
+
+ sigc::signal<void,const std::list<DataType>&,Gtk::TreeView*,int,int,Glib::RefPtr<Gdk::DragContext>&> signal_drop;
+
+ void on_drag_data_get(const Glib::RefPtr<Gdk::DragContext>& context, Gtk::SelectionData& selection_data, guint info, guint time) {
+ if (selection_data.get_target() == "GTK_TREE_MODEL_ROW") {
+
+ TreeView::on_drag_data_get (context, selection_data, info, time);
+
+ } else if (selection_data.get_target() == object_type) {
+
+ /* we don't care about the data passed around by DnD, but
+ we have to provide something otherwise it will stop.
+ */
+
+ guchar c;
+ selection_data.set (8, (guchar*)&c, 1);
+ }
+ }
+
+ void on_drag_data_received(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, const Gtk::SelectionData& selection_data, guint info, guint time) {
+ if (suggested_action) {
+ /* this is a drag motion callback. just update the status to
+ say that we are still dragging, and that's it.
+ */
+ suggested_action = Gdk::DragAction (0);
+ TreeView::on_drag_data_received (context, x, y, selection_data, info, time);
+ return;
+ }
+
+ if (selection_data.get_target() == "GTK_TREE_MODEL_ROW") {
+
+ TreeView::on_drag_data_received (context, x, y, selection_data, info, time);
+
+
+ } else if (selection_data.get_target() == object_type) {
+
+ end_object_drag (const_cast<Glib::RefPtr<Gdk::DragContext>& > (context), x, y);
+
+ } else {
+ /* some kind of target type added by the app, which will be handled by a signal handler */
+ }
+ }
+
+ /**
+ * This can be called by the Treeview itself or by some other
+ * object that wants to get the list of dragged items.
+ */
+
+ void get_object_drag_data (std::list<DataType>& l, Gtk::TreeView** source) {
+
+ if (drag_data.source == 0) {
+ return;
+ }
+
+ Glib::RefPtr<Gtk::TreeModel> model = drag_data.source->get_model();
+ DataType v;
+ Gtk::TreeSelection::ListHandle_Path selection = drag_data.source->get_selection()->get_selected_rows ();
+
+ for (Gtk::TreeSelection::ListHandle_Path::iterator x = selection.begin(); x != selection.end(); ++x) {
+ model->get_iter (*x)->get_value (drag_data.data_column, v);
+ l.push_back (v);
+ }
+
+ *source = drag_data.source;
+ }
+
+ private:
+ void end_object_drag (Glib::RefPtr<Gdk::DragContext>& context, int x, int y) {
+ std::list<DataType> l;
+ Gtk::TreeView* source;
+ get_object_drag_data (l, &source);
+ signal_drop (l, source, x, y, context);
+ }
+
};
} // namespace
projects / ardour.git / blobdiff