libs/gtkmm2ext/dndtreeview.cc

   1 #include <cstdio>
   2
   3 #include <gtkmm2ext/dndtreeview.h>
   4
   5 using namespace std;
   6 using namespace sigc;
   7 using namespace Gdk;
   8 using namespace Gtk;
   9 using namespace Glib;
  10 using namespace Gtkmm2ext;
  11
  12 DnDTreeView::DnDTreeView ()
  13         : TreeView ()
  14 {
  15         draggable.push_back (TargetEntry ("GTK_TREE_MODEL_ROW", TARGET_SAME_WIDGET));
  16
  17         enable_model_drag_source (draggable);
  18         enable_model_drag_dest (draggable);
  19
  20         suggested_action = Gdk::DragAction (0);
  21 }
  22
  23 void
  24 DnDTreeView::add_object_drag (int column, string type_name)
  25 {
  26         draggable.push_back (TargetEntry (type_name, TargetFlags(0)));
  27         data_column = column;
  28
  29         enable_model_drag_source (draggable);
  30         enable_model_drag_dest (draggable);
  31 }
  32
  33 DnDTreeView::SerializedObjectPointers*
  34 DnDTreeView::serialize_pointers (RefPtr<TreeModel> model, TreeSelection::ListHandle_Path* selection, ustring type)
  35 {
  36         uint32_t cnt = selection->size();
  37         uint32_t sz = (sizeof (void*) * cnt) + sizeof (SerializedObjectPointers);
  38
  39         char* buf = new char[sz];
  40         SerializedObjectPointers* sr = new (buf) SerializedObjectPointers;
  41
  42         sr->cnt = cnt;
  43         sr->size = sz;
  44
  45         snprintf (sr->type, sizeof (sr->type), "%s", type.c_str());
  46
  47         cnt = 0;
  48
  49         for (TreeSelection::ListHandle_Path::iterator x = selection->begin(); x != selection->end(); ++x, ++cnt) {
  50                 TreeModel::Row row = *(model->get_iter (*x));
  51                 row.get_value (data_column, sr->ptr[cnt]);
  52         }
  53
  54         return sr;
  55 }
  56
  57 void
  58 DnDTreeView::on_drag_data_get(const RefPtr<DragContext>& context, SelectionData& selection_data, guint info, guint time)
  59 {
  60         if (selection_data.get_target() == "GTK_TREE_MODEL_ROW") {
  61
  62                 TreeView::on_drag_data_get (context, selection_data, info, time);
  63
  64         } else {
  65
  66                 Gtk::TreeSelection::ListHandle_Path selection = get_selection()->get_selected_rows ();
  67                 SerializedObjectPointers* sr = serialize_pointers (get_model(), &selection, selection_data.get_target());
  68                 selection_data.set (8, (guchar*)sr, sr->size);
  69
  70         }
  71 }
  72
  73 void
  74 DnDTreeView::on_drag_data_received(const RefPtr<DragContext>& context, int x, int y, const SelectionData& selection_data, guint info, guint time)
  75 {
  76         if (suggested_action) {
  77                 /* this is a drag motion callback. just update the status to
  78                    say that we are still dragging, and that's it.
  79                 */
  80                 suggested_action = Gdk::DragAction (0);
  81                 TreeView::on_drag_data_received (context, x, y, selection_data, info, time);
  82                 return;
  83         }
  84
  85         if (selection_data.get_target() == "GTK_TREE_MODEL_ROW") {
  86
  87                 TreeView::on_drag_data_received (context, x, y, selection_data, info, time);
  88
  89         } else {
  90                 /* object D-n-D */
  91
  92                 const SerializedObjectPointers* sr = reinterpret_cast<const SerializedObjectPointers *>(selection_data.get_data());
  93
  94                 if (sr) {
  95                         signal_object_drop (sr->type, sr->cnt, const_cast<void**>(sr->ptr));
  96                 }
  97
  98                 context->drag_finish (true, false, time);
  99
 100         }
 101 }
 102
 103