+++ /dev/null
-/*
- 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_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;
-};
-
-template<class DataType>
-class DnDTreeView : public DnDTreeViewBase
-{
- public:
- DnDTreeView() {}
- ~DnDTreeView() {}
-
- sigc::signal<void,std::string,uint32_t,const DataType*> signal_object_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 (data_column >= 0) {
-
- Gtk::TreeSelection::ListHandle_Path selection = get_selection()->get_selected_rows ();
- SerializedObjectPointers<DataType>* sr = serialize_pointers (get_model(), &selection, selection_data.get_target());
- selection_data.set (8, (guchar*)sr, sr->size);
- }
- }
-
- 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 (data_column >= 0) {
-
- /* object D-n-D */
-
- const void* data = selection_data.get_data();
- const SerializedObjectPointers<DataType>* sr = reinterpret_cast<const SerializedObjectPointers<DataType> *>(data);
-
- if (sr) {
- signal_object_drop (sr->type, sr->cnt, sr->data);
- }
-
- } else {
- /* some kind of target type added by the app, which will be handled by a signal handler */
- }
- }
-
- private:
-
- SerializedObjectPointers<DataType>* serialize_pointers (Glib::RefPtr<Gtk::TreeModel> model,
- Gtk::TreeSelection::ListHandle_Path* selection,
- Glib::ustring type) {
-
- /* this nasty chunk of code is here because X's DnD protocol (probably other graphics UI's too)
- requires that we package up the entire data collection for DnD in a single contiguous region
- (so that it can be trivially copied between address spaces). We don't know the type of DataType so
- we have to mix-and-match C and C++ programming techniques here to get the right result.
-
- The C trick is to use the "someType foo[0];" declaration trick to create a zero-sized array at the
- end of a SerializedObjectPointers<DataType object. Then we allocate a raw memory buffer that extends
- past that array and thus provides space for however many DataType items we actually want to pass
- around.
-
- The C++ trick is to use the placement operator new() syntax to initialize that extra
- memory properly.
- */
-
- uint32_t cnt = selection->size();
- uint32_t sz = (sizeof (DataType) * cnt) + sizeof (SerializedObjectPointers<DataType>);
-
- char* buf = new char[sz];
- SerializedObjectPointers<DataType>* sr = (SerializedObjectPointers<DataType>*) buf;
-
- for (uint32_t i = 0; i < cnt; ++i) {
- new ((void *) &sr->data[i]) DataType ();
- }
-
- sr->cnt = cnt;
- sr->size = sz;
- snprintf (sr->type, sizeof (sr->type), "%s", type.c_str());
-
- cnt = 0;
-
- for (Gtk::TreeSelection::ListHandle_Path::iterator x = selection->begin(); x != selection->end(); ++x, ++cnt) {
- model->get_iter (*x)->get_value (data_column, sr->data[cnt]);
- }
-
- return sr;
- }
-};
-
-} // namespace
-
-#endif /* __gtkmm2ext_dndtreeview_h__ */
projects / ardour.git / blobdiff