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/*
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__
#include <stdint.h>
#include <string>
#include <gtkmm/treeview.h>
#include <gtkmm/treeselection.h>
#include <gtkmm/selectiondata.h>
namespace Gtkmm2ext {
template<class DataType>
struct SerializedObjectPointers {
uint32_t size;
uint32_t cnt;
char type[32];
DataType data[0];
};
class DnDTreeViewBase : public Gtk::TreeView
{
private:
public:
DnDTreeViewBase ();
~DnDTreeViewBase() {}
void add_drop_targets (std::list<Gtk::TargetEntry>&);
void add_object_drag (int column, std::string type_name);
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);
}
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);
protected:
std::list<Gtk::TargetEntry> draggable;
Gdk::DragAction suggested_action;
int data_column;
std::string object_type;
struct DragData {
Gtk::TreeView* source;
int data_column;
std::string object_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) {
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
#endif /* __gtkmm2ext_dndtreeview_h__ */
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