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#include <cstdio>
#include <iostream>
#include <gtkmm2ext/dndtreeview.h>
using namespace std;
using namespace sigc;
using namespace Gdk;
using namespace Gtk;
using namespace Glib;
using namespace Gtkmm2ext;
DnDTreeView::DnDTreeView ()
: TreeView ()
{
draggable.push_back (TargetEntry ("GTK_TREE_MODEL_ROW", TARGET_SAME_WIDGET));
data_column = -1;
enable_model_drag_source (draggable);
enable_model_drag_dest (draggable);
suggested_action = Gdk::DragAction (0);
}
void
DnDTreeView::add_drop_targets (list<TargetEntry>& targets)
{
for (list<TargetEntry>::iterator i = targets.begin(); i != targets.end(); ++i) {
draggable.push_back (*i);
}
enable_model_drag_source (draggable);
enable_model_drag_dest (draggable);
}
void
DnDTreeView::add_object_drag (int column, string type_name)
{
draggable.push_back (TargetEntry (type_name, TargetFlags(0)));
data_column = column;
enable_model_drag_source (draggable);
enable_model_drag_dest (draggable);
}
DnDTreeView::SerializedObjectPointers*
DnDTreeView::serialize_pointers (RefPtr<TreeModel> model, TreeSelection::ListHandle_Path* selection, ustring type)
{
uint32_t cnt = selection->size();
uint32_t sz = (sizeof (void*) * cnt) + sizeof (SerializedObjectPointers);
cerr << "lets plan to serialize " << cnt << " from selection\n";
char* buf = new char[sz];
SerializedObjectPointers* sr = new (buf) SerializedObjectPointers;
sr->cnt = cnt;
sr->size = sz;
snprintf (sr->type, sizeof (sr->type), "%s", type.c_str());
cnt = 0;
for (TreeSelection::ListHandle_Path::iterator x = selection->begin(); x != selection->end(); ++x, ++cnt) {
cerr << "getting next item\n";
TreeModel::Row row = *(model->get_iter (*x));
row.get_value (data_column, sr->ptr[cnt]);
}
cerr << "returning an SR with size = " << sr->size << endl;
return sr;
}
void
DnDTreeView::on_drag_data_get(const RefPtr<DragContext>& context, 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* sr = serialize_pointers (get_model(), &selection, selection_data.get_target());
selection_data.set (8, (guchar*)sr, sr->size);
cerr << "selection data set to contain " << sr->size << endl;
}
}
void
DnDTreeView::on_drag_data_received(const RefPtr<DragContext>& context, int x, int y, const 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 SerializedObjectPointers* sr = reinterpret_cast<const SerializedObjectPointers *>(selection_data.get_data());
if (sr) {
signal_object_drop (sr->type, sr->cnt, const_cast<void**>(sr->ptr));
}
} else {
/* some kind of target type added by the app, which will be handled by a signal handler */
}
}
bool
DnDTreeView::on_drag_drop(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, guint time)
{
suggested_action = Gdk::DragAction (0);
return TreeView::on_drag_drop (context, x, y, time);
}
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