diff options
author | Paul Davis <paul@linuxaudiosystems.com> | 2008-11-25 00:03:21 +0000 |
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committer | Paul Davis <paul@linuxaudiosystems.com> | 2008-11-25 00:03:21 +0000 |
commit | 093e12ac9f35a38764e221b3ecf85a45d5cf20ac (patch) | |
tree | f42d5cf00f662147fbc079a8f90f615ee561298f /libs/gtkmm2ext | |
parent | 1f6f5da0032fb39238ad96436e7fd32840010954 (diff) |
enough mind-blowing crazy code, lets do intra-ardour DnD the right way
git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@4245 d708f5d6-7413-0410-9779-e7cbd77b26cf
Diffstat (limited to 'libs/gtkmm2ext')
-rw-r--r-- | libs/gtkmm2ext/dndtreeview.cc | 3 | ||||
-rw-r--r-- | libs/gtkmm2ext/gtkmm2ext/dndtreeview.h | 114 |
2 files changed, 43 insertions, 74 deletions
diff --git a/libs/gtkmm2ext/dndtreeview.cc b/libs/gtkmm2ext/dndtreeview.cc index a840114def..0695dd3281 100644 --- a/libs/gtkmm2ext/dndtreeview.cc +++ b/libs/gtkmm2ext/dndtreeview.cc @@ -29,6 +29,8 @@ using namespace Gtk; using namespace Glib; using namespace Gtkmm2ext; +DnDTreeViewBase::DragData DnDTreeViewBase::drag_data; + DnDTreeViewBase::DnDTreeViewBase () : TreeView () { @@ -57,6 +59,7 @@ DnDTreeViewBase::add_object_drag (int column, string type_name) { draggable.push_back (TargetEntry (type_name, TargetFlags(0))); data_column = column; + object_type = type_name; enable_model_drag_source (draggable); enable_model_drag_dest (draggable); diff --git a/libs/gtkmm2ext/gtkmm2ext/dndtreeview.h b/libs/gtkmm2ext/gtkmm2ext/dndtreeview.h index e7f4aeb83d..08d54bb139 100644 --- a/libs/gtkmm2ext/gtkmm2ext/dndtreeview.h +++ b/libs/gtkmm2ext/gtkmm2ext/dndtreeview.h @@ -62,6 +62,21 @@ class DnDTreeViewBase : public Gtk::TreeView 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> @@ -71,26 +86,23 @@ class DnDTreeView : public DnDTreeViewBase DnDTreeView() {} ~DnDTreeView() {} - sigc::signal<void,std::string,uint32_t,const DataType*> signal_object_drop; + sigc::signal<void,const std::list<DataType>& > 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 (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); - /* we don't need the allocated block anymore, - it will have been copied. this is wierd - - the objects we put into the block have - effectively been moved into the copy - made by Gtk::SelectionData::set(), - leaving our memory block a mere ghost. - we're just fixing a memory leak here. - */ - delete [] (reinterpret_cast<char*>(sr)); + + } else if (selection_data.get_target() == object_type) { + + start_object_drag (); + + /* 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); } } @@ -108,30 +120,11 @@ class DnDTreeView : public DnDTreeViewBase 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); - - /* now clean up the pointers in the blob. - Note that we make an explicit call - to the destructor rather than using - delete - the object does not own - the memory in which it lives - it - was allocated as a single contiguous - block (see below). - */ - - for (uint32_t x = 0; x < sr->cnt; ++x) { - sr->data[x].~DataType(); - } - } + + } else if (selection_data.get_target() == object_type) { + end_object_drag (); + } else { /* some kind of target type added by the app, which will be handled by a signal handler */ } @@ -139,45 +132,18 @@ class DnDTreeView : public DnDTreeViewBase 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; + void end_object_drag () { + Glib::RefPtr<Gtk::TreeModel> model = drag_data.source->get_model(); + DataType v; + std::list<DataType> l; + 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, ++cnt) { - model->get_iter (*x)->get_value (data_column, sr->data[cnt]); + 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); } - return sr; + signal_drop (l); } }; |