Create the session range location as and when the session first gets some content...
[ardour.git] / gtk2_ardour / editor_mouse.cc
index 4ac5cf69897c49671ec783baac69886aaf624a2e..dfdb3c811a76835878902d6c66c528e86df62515 100644 (file)
@@ -31,6 +31,7 @@
 #include <gtkmm2ext/tearoff.h>
 #include "pbd/memento_command.h"
 #include "pbd/basename.h"
+#include "pbd/stateful_diff_command.h"
 
 #include "ardour_ui.h"
 #include "actions.h"
@@ -76,9 +77,9 @@
 using namespace std;
 using namespace ARDOUR;
 using namespace PBD;
-using namespace sigc;
 using namespace Gtk;
 using namespace Editing;
+using Gtkmm2ext::Keyboard;
 
 bool
 Editor::mouse_frame (nframes64_t& where, bool& in_track_canvas) const
@@ -134,13 +135,11 @@ Editor::event_frame (GdkEvent const * event, double* pcx, double* pcy) const
        case GDK_BUTTON_PRESS:
        case GDK_2BUTTON_PRESS:
        case GDK_3BUTTON_PRESS:
-
                *pcx = event->button.x;
                *pcy = event->button.y;
                _trackview_group->w2i(*pcx, *pcy);
                break;
        case GDK_MOTION_NOTIFY:
-
                *pcx = event->motion.x;
                *pcy = event->motion.y;
                _trackview_group->w2i(*pcx, *pcy);
@@ -254,6 +253,17 @@ Editor::set_canvas_cursor ()
                }
        }
 
+       switch (_join_object_range_state) {
+       case JOIN_OBJECT_RANGE_NONE:
+               break;
+       case JOIN_OBJECT_RANGE_OBJECT:
+               current_canvas_cursor = which_grabber_cursor ();
+               break;
+       case JOIN_OBJECT_RANGE_RANGE:
+               current_canvas_cursor = selector_cursor;
+               break;
+       }
+
        if (is_drawable()) {
                track_canvas->get_window()->set_cursor(*current_canvas_cursor);
        }
@@ -262,7 +272,7 @@ Editor::set_canvas_cursor ()
 void
 Editor::set_mouse_mode (MouseMode m, bool force)
 {
-       if (_drag) {
+       if (_drags->active ()) {
                return;
        }
 
@@ -315,9 +325,9 @@ Editor::mouse_mode_toggled (MouseMode m)
 
        instant_save ();
 
-       if (mouse_mode != MouseRange) {
+       if (mouse_mode != MouseRange && _join_object_range_state == JOIN_OBJECT_RANGE_NONE) {
 
-               /* in all modes except range, hide the range selection,
+               /* in all modes except range and joined object/range, hide the range selection,
                   show the object (region) selection.
                */
 
@@ -331,13 +341,11 @@ Editor::mouse_mode_toggled (MouseMode m)
        } else {
 
                /*
-                  in range mode,show the range selection.
+                  in range or object/range mode, show the range selection.
                */
 
                for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
-                       if ((*i)->get_selected()) {
-                               (*i)->show_selection (selection->time);
-                       }
+                       (*i)->show_selection (selection->time);
                }
        }
 
@@ -418,6 +426,7 @@ Editor::button_selection (ArdourCanvas::Item* /*item*/, GdkEvent* event, ItemTyp
        */
 
        if (((mouse_mode != MouseObject) &&
+            (_join_object_range_state != JOIN_OBJECT_RANGE_OBJECT) &&
             (mouse_mode != MouseAudition || item_type != RegionItem) &&
             (mouse_mode != MouseTimeFX || item_type != RegionItem) &&
             (mouse_mode != MouseGain) &&
@@ -440,23 +449,28 @@ Editor::button_selection (ArdourCanvas::Item* /*item*/, GdkEvent* event, ItemTyp
                }
        }
 
-       Selection::Operation op = Keyboard::selection_type (event->button.state);
+       Selection::Operation op = ArdourKeyboard::selection_type (event->button.state);
        bool press = (event->type == GDK_BUTTON_PRESS);
 
        // begin_reversible_command (_("select on click"));
 
        switch (item_type) {
        case RegionItem:
-               if (mouse_mode != MouseRange) {
+               if (mouse_mode != MouseRange || _join_object_range_state == JOIN_OBJECT_RANGE_OBJECT) {
                        set_selected_regionview_from_click (press, op, true);
                } else if (event->type == GDK_BUTTON_PRESS) {
-                       set_selected_track_as_side_effect ();
+                       selection->clear_tracks ();
+                       set_selected_track_as_side_effect (true);
                }
+               if (_join_object_range_state == JOIN_OBJECT_RANGE_OBJECT && !selection->regions.empty()) {
+                       clicked_selection = select_range_around_region (selection->regions.front());
+               }
+                       
                break;
 
        case RegionViewNameHighlight:
        case RegionViewName:
-               if (mouse_mode != MouseRange) {
+               if (mouse_mode != MouseRange || _join_object_range_state == JOIN_OBJECT_RANGE_OBJECT) {
                        set_selected_regionview_from_click (press, op, true);
                } else if (event->type == GDK_BUTTON_PRESS) {
                        set_selected_track_as_side_effect ();
@@ -468,7 +482,7 @@ Editor::button_selection (ArdourCanvas::Item* /*item*/, GdkEvent* event, ItemTyp
        case FadeInItem:
        case FadeOutHandleItem:
        case FadeOutItem:
-               if (mouse_mode != MouseRange) {
+               if (mouse_mode != MouseRange || _join_object_range_state == JOIN_OBJECT_RANGE_OBJECT) {
                        set_selected_regionview_from_click (press, op, true);
                } else if (event->type == GDK_BUTTON_PRESS) {
                        set_selected_track_as_side_effect ();
@@ -477,17 +491,16 @@ Editor::button_selection (ArdourCanvas::Item* /*item*/, GdkEvent* event, ItemTyp
 
        case ControlPointItem:
                set_selected_track_as_side_effect ();
-               if (mouse_mode != MouseRange) {
+               if (mouse_mode != MouseRange || _join_object_range_state == JOIN_OBJECT_RANGE_OBJECT) {
                        set_selected_control_point_from_click (op, false);
                }
                break;
 
        case StreamItem:
-               /* for context click or range selection, select track */
+               /* for context click, select track */
                if (event->button.button == 3) {
-                       set_selected_track_as_side_effect ();
-               } else if (event->type == GDK_BUTTON_PRESS && mouse_mode == MouseRange) {
-                       set_selected_track_as_side_effect ();
+                       selection->clear_tracks ();
+                       set_selected_track_as_side_effect (true);
                }
                break;
 
@@ -503,10 +516,8 @@ Editor::button_selection (ArdourCanvas::Item* /*item*/, GdkEvent* event, ItemTyp
 bool
 Editor::button_press_handler_1 (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type)
 {
-       if (_drag) {
-               _drag->item()->ungrab (event->button.time);
-               delete _drag;
-               _drag = 0;
+       if (_drags->active ()) {
+               _drags->abort ();
        }
 
        /* single mouse clicks on any of these item types operate
@@ -517,83 +528,73 @@ Editor::button_press_handler_1 (ArdourCanvas::Item* item, GdkEvent* event, ItemT
 
        switch (item_type) {
        case PlayheadCursorItem:
-               assert (_drag == 0);
-               _drag = new CursorDrag (this, item, true);
-               _drag->start_grab (event);
+               _drags->set (new CursorDrag (this, item, true), event);
                return true;
 
        case MarkerItem:
                if (Keyboard::modifier_state_equals (event->button.state, Keyboard::ModifierMask(Keyboard::PrimaryModifier|Keyboard::TertiaryModifier))) {
                        hide_marker (item, event);
                } else {
-                       assert (_drag == 0);
-                       _drag = new MarkerDrag (this, item);
-                       _drag->start_grab (event);
+                       _drags->set (new MarkerDrag (this, item), event);
                }
                return true;
 
        case TempoMarkerItem:
-               assert (_drag == 0);
-               _drag = new TempoMarkerDrag (
-                       this,
-                       item,
-                       Keyboard::modifier_state_contains (event->button.state, Keyboard::CopyModifier)
+               _drags->set (
+                       new TempoMarkerDrag (
+                               this,
+                               item,
+                               Keyboard::modifier_state_contains (event->button.state, Keyboard::CopyModifier)
+                               ),
+                       event
                        );
-               _drag->start_grab (event);
                return true;
 
        case MeterMarkerItem:
-               assert (_drag == 0);
-               _drag = new MeterMarkerDrag (
-                       this,
-                       item,
-                       Keyboard::modifier_state_contains (event->button.state, Keyboard::CopyModifier)
+               _drags->set (
+                       new MeterMarkerDrag (
+                               this,
+                               item,
+                               Keyboard::modifier_state_contains (event->button.state, Keyboard::CopyModifier)
+                               ),
+                       event
                        );
-               _drag->start_grab (event);
                return true;
 
        case MarkerBarItem:
        case TempoBarItem:
        case MeterBarItem:
                if (!Keyboard::modifier_state_equals (event->button.state, Keyboard::PrimaryModifier)) {
-                       assert (_drag == 0);
-                       _drag = new CursorDrag (this, &playhead_cursor->canvas_item, false);
-                       _drag->start_grab (event);
+                       _drags->set (new CursorDrag (this, &playhead_cursor->canvas_item, false), event);
                }
                return true;
                break;
 
 
        case RangeMarkerBarItem:
-               assert (_drag == 0);
                if (!Keyboard::modifier_state_equals (event->button.state, Keyboard::PrimaryModifier)) {
-                       _drag = new CursorDrag (this, &playhead_cursor->canvas_item, false);
+                       _drags->set (new CursorDrag (this, &playhead_cursor->canvas_item, false), event);
                } else {
-                       _drag = new RangeMarkerBarDrag (this, item, RangeMarkerBarDrag::CreateRangeMarker);
+                       _drags->set (new RangeMarkerBarDrag (this, item, RangeMarkerBarDrag::CreateRangeMarker), event);
                }
-               _drag->start_grab (event);
                return true;
                break;
 
        case CdMarkerBarItem:
-               assert (_drag == 0);
                if (!Keyboard::modifier_state_equals (event->button.state, Keyboard::PrimaryModifier)) {
-                       _drag = new CursorDrag (this, &playhead_cursor->canvas_item, false);
+                       _drags->set (new CursorDrag (this, &playhead_cursor->canvas_item, false), event);
                } else {
-                       _drag = new RangeMarkerBarDrag (this, item, RangeMarkerBarDrag::CreateCDMarker);
+                       _drags->set (new RangeMarkerBarDrag (this, item, RangeMarkerBarDrag::CreateCDMarker), event);
                }
-               _drag->start_grab (event);
                return true;
                break;
 
        case TransportMarkerBarItem:
-               assert (_drag == 0);
                if (!Keyboard::modifier_state_equals (event->button.state, Keyboard::PrimaryModifier)) {
-                       _drag = new CursorDrag (this, &playhead_cursor->canvas_item, false);
+                       _drags->set (new CursorDrag (this, &playhead_cursor->canvas_item, false), event);
                } else {
-                       _drag = new RangeMarkerBarDrag (this, item, RangeMarkerBarDrag::CreateTransportMarker);
+                       _drags->set (new RangeMarkerBarDrag (this, item, RangeMarkerBarDrag::CreateTransportMarker), event);
                }
-               _drag->start_grab (event);
                return true;
                break;
 
@@ -601,278 +602,316 @@ Editor::button_press_handler_1 (ArdourCanvas::Item* item, GdkEvent* event, ItemT
                break;
        }
 
-       if (internal_editing()) {
-               switch (item_type) {
-               case StreamItem:
-                       assert (_drag == 0);
-                       _drag = new RegionCreateDrag (this, item, clicked_axisview);
-                       _drag->start_grab (event);
-                       return true;
-               case NoteItem:
-                       /* Note: we don't get here if not in internal_editing() mode */
-                       if (mouse_mode == MouseTimeFX) {
-                               assert (_drag == 0);
-                               _drag = new NoteResizeDrag (this, item);
-                               _drag->start_grab (event);
-                               return true;
-                       } else if (mouse_mode == MouseObject) {
-                               assert (_drag == 0);
-                               _drag = new NoteDrag (this, item);
-                               _drag->start_grab (event);
-                               return true;
-                       } else {
-                               return false;
-                       }
-                       break;
-               default:
-                       return true;
+       if (_join_object_range_state == JOIN_OBJECT_RANGE_OBJECT) {
+               /* special case: allow trim of range selections in joined object mode;
+                  in theory eff should equal MouseRange in this case, but it doesn't
+                  because entering the range selection canvas item results in entered_regionview
+                  being set to 0, so update_join_object_range_location acts as if we aren't
+                  over a region.
+               */
+               if (item_type == StartSelectionTrimItem) {
+                       _drags->set (new SelectionDrag (this, item, SelectionDrag::SelectionStartTrim), event);
+               } else if (item_type == EndSelectionTrimItem) {
+                       _drags->set (new SelectionDrag (this, item, SelectionDrag::SelectionEndTrim), event);
                }
-       } else {
-               switch (mouse_mode) {
-               case MouseRange:
-                       switch (item_type) {
-                       case StartSelectionTrimItem:
-                               assert (_drag == 0);
-                               _drag = new SelectionDrag (this, item, SelectionDrag::SelectionStartTrim);
-                               _drag->start_grab (event);
-                               break;
+       }
 
-                       case EndSelectionTrimItem:
-                               assert (_drag == 0);
-                               _drag = new SelectionDrag (this, item, SelectionDrag::SelectionEndTrim);
-                               _drag->start_grab (event);
-                               break;
+       Editing::MouseMode eff = effective_mouse_mode ();
 
-                       case SelectionItem:
-                               if (Keyboard::modifier_state_contains
-                                   (event->button.state, Keyboard::ModifierMask(Keyboard::SecondaryModifier))) {
-                                       // contains and not equals because I can't use alt as a modifier alone.
-                                       start_selection_grab (item, event);
-                               } else if (Keyboard::modifier_state_equals (event->button.state, Keyboard::PrimaryModifier)) {
-                                       /* grab selection for moving */
-                                       assert (_drag == 0);
-                                       _drag = new SelectionDrag (this, item, SelectionDrag::SelectionMove);
-                                       _drag->start_grab (event);
-                               } else {
-                                       /* this was debated, but decided the more common action was to
-                                          make a new selection */
-                                       assert (_drag == 0);
-                                       _drag = new SelectionDrag (this, item, SelectionDrag::CreateSelection);
-                                       _drag->start_grab (event);
-                               }
-                               break;
+       /* special case: allow drag of region fade in/out in object mode with join object/range enabled */
+       if (item_type == FadeInHandleItem || item_type == FadeOutHandleItem) {
+               eff = MouseObject;
+       }
 
-                       default:
-                               assert (_drag == 0);
-                               _drag = new SelectionDrag (this, item, SelectionDrag::CreateSelection);
-                               _drag->start_grab (event);
-                       }
-                       return true;
+       switch (eff) {
+       case MouseRange:
+               switch (item_type) {
+               case StartSelectionTrimItem:
+                       _drags->set (new SelectionDrag (this, item, SelectionDrag::SelectionStartTrim), event);
                        break;
 
-               case MouseObject:
-                       if (Keyboard::modifier_state_contains (event->button.state, Keyboard::ModifierMask(Keyboard::PrimaryModifier|Keyboard::SecondaryModifier)) &&
-                           event->type == GDK_BUTTON_PRESS) {
-
-                               assert (_drag == 0);
-                               _drag = new RubberbandSelectDrag (this, item);
-                               _drag->start_grab (event);
-
-                       } else if (event->type == GDK_BUTTON_PRESS) {
-
-                               switch (item_type) {
-                               case FadeInHandleItem:
-                               {
-                                       assert (_drag == 0);
-                                       RegionSelection s = get_equivalent_regions (selection->regions, RouteGroup::Edit);
-                                       _drag = new FadeInDrag (this, item, reinterpret_cast<RegionView*> (item->get_data("regionview")), s);
-                                       _drag->start_grab (event);
-                                       return true;
-                               }
-
-                               case FadeOutHandleItem:
-                               {
-                                       assert (_drag == 0);
-                                       RegionSelection s = get_equivalent_regions (selection->regions, RouteGroup::Edit);
-                                       _drag = new FadeOutDrag (this, item, reinterpret_cast<RegionView*> (item->get_data("regionview")), s);
-                                       _drag->start_grab (event);
-                                       return true;
-                               }
+               case EndSelectionTrimItem:
+                       _drags->set (new SelectionDrag (this, item, SelectionDrag::SelectionEndTrim), event);
+                       break;
 
-                               case RegionItem:
-                                       if (Keyboard::modifier_state_contains (event->button.state, Keyboard::CopyModifier)) {
-                                               start_region_copy_grab (item, event, clicked_regionview);
-                                       } else if (Keyboard::the_keyboard().key_is_down (GDK_b)) {
-                                               start_region_brush_grab (item, event, clicked_regionview);
+               case SelectionItem:
+                       if (Keyboard::modifier_state_contains
+                           (event->button.state, Keyboard::ModifierMask(Keyboard::PrimaryModifier))) {
+                               // contains and not equals because I can't use alt as a modifier alone.
+                               start_selection_grab (item, event);
+                       } else if (Keyboard::modifier_state_equals (event->button.state, Keyboard::SecondaryModifier)) {
+                               /* grab selection for moving */
+                               _drags->set (new SelectionDrag (this, item, SelectionDrag::SelectionMove), event);
+                       } else {
+                               double const y = event->button.y + vertical_adjustment.get_value() - canvas_timebars_vsize;
+                               pair<TimeAxisView*, int> tvp = trackview_by_y_position (y);
+                               if (tvp.first) {
+                                       AutomationTimeAxisView* atv = dynamic_cast<AutomationTimeAxisView*> (tvp.first);
+                                       if (join_object_range_button.get_active() && atv) {
+                                               /* smart "join" mode: drag automation */
+                                               _drags->set (new AutomationRangeDrag (this, atv->base_item(), selection->time), event);
                                        } else {
-                                               start_region_grab (item, event, clicked_regionview);
+                                               /* this was debated, but decided the more common action was to
+                                                  make a new selection */
+                                               _drags->set (new SelectionDrag (this, item, SelectionDrag::CreateSelection), event);
                                        }
-                                       break;
-
-                               case RegionViewNameHighlight:
-                               {
-                                       assert (_drag == 0);
-                                       RegionSelection s = get_equivalent_regions (selection->regions, RouteGroup::Edit);
-                                       _drag = new TrimDrag (this, item, clicked_regionview, s.by_layer());
-                                       _drag->start_grab (event);
-                                       return true;
-                                       break;
-                               }
-
-                               case RegionViewName:
-                               {
-                                       /* rename happens on edit clicks */
-                                       assert (_drag == 0);
-                                       RegionSelection s = get_equivalent_regions (selection->regions, RouteGroup::Edit);
-                                       _drag = new TrimDrag (this, clicked_regionview->get_name_highlight(), clicked_regionview, s.by_layer());
-                                       _drag->start_grab (event);
-                                       return true;
-                                       break;
                                }
+                       }
+                       break;
 
-                               case ControlPointItem:
-                                       assert (_drag == 0);
-                                       _drag = new ControlPointDrag (this, item);
-                                       _drag->start_grab (event);
-                                       return true;
-                                       break;
+               default:
+                       _drags->set (new SelectionDrag (this, item, SelectionDrag::CreateSelection), event);
+               }
+               return true;
+               break;
 
-                               case AutomationLineItem:
-                                       assert (_drag == 0);
-                                       _drag = new LineDrag (this, item);
-                                       _drag->start_grab (event);
-                                       return true;
-                                       break;
+       case MouseObject:
+               switch (item_type) {
+               case NoteItem:
+                       if (internal_editing()) {
+                               /* Note: we don't get here if not in internal_editing() mode */
+                               _drags->set (new NoteDrag (this, item), event);
+                               return true;
+                       }
+                       break;
+                       
+               default:
+                       break;
+               }
 
-                               case StreamItem:
-                               case AutomationTrackItem:
-                                       assert (_drag == 0);
-                                       _drag = new RubberbandSelectDrag (this, item);
-                                       _drag->start_grab (event);
-                                       break;
+               if (Keyboard::modifier_state_contains (event->button.state, Keyboard::ModifierMask(Keyboard::PrimaryModifier|Keyboard::SecondaryModifier)) &&
+                   event->type == GDK_BUTTON_PRESS) {
 
-#ifdef WITH_CMT
-                               case ImageFrameHandleStartItem:
-                                       imageframe_start_handle_op(item, event) ;
-                                       return(true) ;
-                                       break ;
-                               case ImageFrameHandleEndItem:
-                                       imageframe_end_handle_op(item, event) ;
-                                       return(true) ;
-                                       break ;
-                               case MarkerViewHandleStartItem:
-                                       markerview_item_start_handle_op(item, event) ;
-                                       return(true) ;
-                                       break ;
-                               case MarkerViewHandleEndItem:
-                                       markerview_item_end_handle_op(item, event) ;
-                                       return(true) ;
-                                       break ;
-                               case MarkerViewItem:
-                                       start_markerview_grab(item, event) ;
-                                       break ;
-                               case ImageFrameItem:
-                                       start_imageframe_grab(item, event) ;
-                                       break ;
-#endif
+                       _drags->set (new RubberbandSelectDrag (this, item), event);
 
-                               case MarkerBarItem:
+               } else if (event->type == GDK_BUTTON_PRESS) {
 
-                                       break;
+                       switch (item_type) {
+                       case FadeInHandleItem:
+                       {
+                               RegionSelection s = get_equivalent_regions (selection->regions, Properties::edit.property_id);
+                               _drags->set (new FadeInDrag (this, item, reinterpret_cast<RegionView*> (item->get_data("regionview")), s), event);
+                               return true;
+                       }
 
-                               default:
-                                       break;
-                               }
+                       case FadeOutHandleItem:
+                       {
+                               RegionSelection s = get_equivalent_regions (selection->regions, Properties::edit.property_id);
+                               _drags->set (new FadeOutDrag (this, item, reinterpret_cast<RegionView*> (item->get_data("regionview")), s), event);
+                               return true;
                        }
-                       return true;
-                       break;
 
-               case MouseGain:
-                       switch (item_type) {
                        case RegionItem:
-                               /* start a grab so that if we finish after moving
-                                  we can tell what happened.
-                               */
-                               assert (_drag == 0);
-                               _drag = new RegionGainDrag (this, item);
-                               _drag->start_grab (event, current_canvas_cursor);
-                               break;
+                               if (Keyboard::modifier_state_contains (event->button.state, Keyboard::CopyModifier)) {
+                                       add_region_copy_drag (item, event, clicked_regionview);
+                               } else if (Keyboard::the_keyboard().key_is_down (GDK_b)) {
+                                       add_region_brush_drag (item, event, clicked_regionview);
+                               } else {
+                                       add_region_drag (item, event, clicked_regionview);
+                               }
 
-                       case GainLineItem:
-                               assert (_drag == 0);
-                               _drag = new LineDrag (this, item);
-                               _drag->start_grab (event);
-                               return true;
+                               if (_join_object_range_state == JOIN_OBJECT_RANGE_OBJECT && !selection->regions.empty()) {
+                                       _drags->add (new SelectionDrag (this, clicked_axisview->get_selection_rect (clicked_selection)->rect, SelectionDrag::SelectionMove));
+                               }
 
-                       case ControlPointItem:
-                               assert (_drag == 0);
-                               _drag = new ControlPointDrag (this, item);
-                               _drag->start_grab (event);
+                               _drags->start_grab (event);
+                               break;
+
+                       case RegionViewNameHighlight:
+                       {
+                               RegionSelection s = get_equivalent_regions (selection->regions, Properties::edit.property_id);
+                               _drags->set (new TrimDrag (this, item, clicked_regionview, s.by_layer()), event);
                                return true;
                                break;
+                       }
 
-                       default:
+                       case RegionViewName:
+                       {
+                               /* rename happens on edit clicks */
+                               RegionSelection s = get_equivalent_regions (selection->regions, Properties::edit.property_id);
+                               _drags->set (new TrimDrag (this, clicked_regionview->get_name_highlight(), clicked_regionview, s.by_layer()), event);
+                               return true;
                                break;
                        }
-                       return true;
-                       break;
 
-                       switch (item_type) {
                        case ControlPointItem:
-                               assert (_drag == 0);
-                               _drag = new ControlPointDrag (this, item);
-                               _drag->start_grab (event);
+                               _drags->set (new ControlPointDrag (this, item), event);
+                               return true;
                                break;
 
                        case AutomationLineItem:
-                               assert (_drag == 0);
-                               _drag = new LineDrag (this, item);
-                               _drag->start_grab (event);
+                               _drags->set (new LineDrag (this, item), event);
+                               return true;
                                break;
 
-                       case RegionItem:
-                               // XXX need automation mode to identify which
-                               // line to use
-                               // start_line_grab_from_regionview (item, event);
+                       case StreamItem:
+                               if (internal_editing()) {
+                                       _drags->set (new RegionCreateDrag (this, item, clicked_axisview), event);
+                                       return true;
+                               } else {
+                                       _drags->set (new RubberbandSelectDrag (this, item), event);
+                               }
+                               break;
+                               
+                       case AutomationTrackItem:
+                               /* rubberband drag to select automation points */
+                               _drags->set (new RubberbandSelectDrag (this, item), event);
+                               break;
+
+                       case SelectionItem:
+                       {
+                               if (join_object_range_button.get_active()) {
+                                       /* we're in "smart" joined mode, and we've clicked on a Selection */
+                                       double const y = event->button.y + vertical_adjustment.get_value() - canvas_timebars_vsize;
+                                       pair<TimeAxisView*, int> tvp = trackview_by_y_position (y);
+                                       if (tvp.first) {
+                                               /* if we're over an automation track, start a drag of its data */
+                                               AutomationTimeAxisView* atv = dynamic_cast<AutomationTimeAxisView*> (tvp.first);
+                                               if (atv) {
+                                                       _drags->set (new AutomationRangeDrag (this, atv->base_item(), selection->time), event);
+                                               }
+
+                                               /* if we're over a track and a region, and in the `object' part of a region,
+                                                  put a selection around the region and drag both
+                                               */
+                                               RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (tvp.first);
+                                               if (rtv && _join_object_range_state == JOIN_OBJECT_RANGE_OBJECT) {
+                                                       boost::shared_ptr<Track> t = boost::dynamic_pointer_cast<Track> (rtv->route ());
+                                                       if (t) {
+                                                               boost::shared_ptr<Playlist> pl = t->playlist ();
+                                                               if (pl) {
+                                                                       
+                                                                       boost::shared_ptr<Region> r = pl->top_region_at (event_frame (event));
+                                                                       if (r) {
+                                                                               RegionView* rv = rtv->view()->find_view (r);
+                                                                               clicked_selection = select_range_around_region (rv);
+                                                                               _drags->add (new SelectionDrag (this, item, SelectionDrag::SelectionMove));
+                                                                               list<RegionView*> rvs;
+                                                                               rvs.push_back (rv);
+                                                                               _drags->add (new RegionMoveDrag (this, item, rv, rvs, false, false));
+                                                                               _drags->start_grab (event);
+                                                                       }
+                                                               }
+                                                       }
+                                               }
+                                       }
+                               }
+                               break;
+                       }
+
+#ifdef WITH_CMT
+                       case ImageFrameHandleStartItem:
+                               imageframe_start_handle_op(item, event) ;
+                               return(true) ;
+                               break ;
+                       case ImageFrameHandleEndItem:
+                               imageframe_end_handle_op(item, event) ;
+                               return(true) ;
+                               break ;
+                       case MarkerViewHandleStartItem:
+                               markerview_item_start_handle_op(item, event) ;
+                               return(true) ;
+                               break ;
+                       case MarkerViewHandleEndItem:
+                               markerview_item_end_handle_op(item, event) ;
+                               return(true) ;
+                               break ;
+                       case MarkerViewItem:
+                               start_markerview_grab(item, event) ;
+                               break ;
+                       case ImageFrameItem:
+                               start_imageframe_grab(item, event) ;
+                               break ;
+#endif
+
+                       case MarkerBarItem:
+
                                break;
 
                        default:
                                break;
                        }
-                       return true;
+               }
+               return true;
+               break;
+
+       case MouseGain:
+               switch (item_type) {
+               case RegionItem:
+                       /* start a grab so that if we finish after moving
+                          we can tell what happened.
+                       */
+                       _drags->set (new RegionGainDrag (this, item), event, current_canvas_cursor);
                        break;
 
-               case MouseZoom:
-                       if (event->type == GDK_BUTTON_PRESS) {
-                               assert (_drag == 0);
-                               _drag = new MouseZoomDrag (this, item);
-                               _drag->start_grab (event);
-                       }
+               case GainLineItem:
+                       _drags->set (new LineDrag (this, item), event);
+                       return true;
 
+               case ControlPointItem:
+                       _drags->set (new ControlPointDrag (this, item), event);
                        return true;
                        break;
 
-               case MouseTimeFX:
-                       if (item_type == RegionItem) {
-                               assert (_drag == 0);
-                               _drag = new TimeFXDrag (this, item, clicked_regionview, selection->regions.by_layer());
-                               _drag->start_grab (event);
-                       }
+               default:
                        break;
+               }
+               return true;
+               break;
 
-               case MouseAudition:
-                       _drag = new ScrubDrag (this, item);
-                       _drag->start_grab (event);
-                       scrub_reversals = 0;
-                       scrub_reverse_distance = 0;
-                       last_scrub_x = event->button.x;
-                       scrubbing_direction = 0;
-                       track_canvas->get_window()->set_cursor (*transparent_cursor);
+               switch (item_type) {
+               case ControlPointItem:
+                       _drags->set (new ControlPointDrag (this, item), event);
+                       break;
+
+               case AutomationLineItem:
+                       _drags->set (new LineDrag (this, item), event);
+                       break;
+
+               case RegionItem:
+                       // XXX need automation mode to identify which
+                       // line to use
+                       // start_line_grab_from_regionview (item, event);
                        break;
 
                default:
                        break;
                }
+               return true;
+               break;
+
+       case MouseZoom:
+               if (event->type == GDK_BUTTON_PRESS) {
+                       _drags->set (new MouseZoomDrag (this, item), event);
+               }
+
+               return true;
+               break;
+
+       case MouseTimeFX:
+               if (internal_editing() && item_type == NoteItem) {
+                       /* drag notes if we're in internal edit mode */
+                       _drags->set (new NoteResizeDrag (this, item), event);
+                       return true;
+               } else if (!internal_editing() || dynamic_cast<AudioRegionView*> (clicked_regionview)) {
+                       /* do time-FX if we're not in internal edit mode, or we are but we clicked on an audio region */
+                       _drags->set (new TimeFXDrag (this, item, clicked_regionview, selection->regions.by_layer()), event);
+                       return true;
+               }
+               break;
+
+       case MouseAudition:
+               _drags->set (new ScrubDrag (this, item), event);
+               scrub_reversals = 0;
+               scrub_reverse_distance = 0;
+               last_scrub_x = event->button.x;
+               scrubbing_direction = 0;
+               track_canvas->get_window()->set_cursor (*transparent_cursor);
+               return true;
+               break;
+
+       default:
+               break;
        }
 
        return false;
@@ -881,21 +920,21 @@ Editor::button_press_handler_1 (ArdourCanvas::Item* item, GdkEvent* event, ItemT
 bool
 Editor::button_press_handler_2 (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type)
 {
-       switch (mouse_mode) {
+       Editing::MouseMode const eff = effective_mouse_mode ();
+       switch (eff) {
        case MouseObject:
                switch (item_type) {
                case RegionItem:
                        if (Keyboard::modifier_state_contains (event->button.state, Keyboard::CopyModifier)) {
-                               start_region_copy_grab (item, event, clicked_regionview);
+                               add_region_copy_drag (item, event, clicked_regionview);
                        } else {
-                               start_region_grab (item, event, clicked_regionview);
+                               add_region_drag (item, event, clicked_regionview);
                        }
+                       _drags->start_grab (event);
                        return true;
                        break;
                case ControlPointItem:
-                       assert (_drag == 0);
-                       _drag = new ControlPointDrag (this, item);
-                       _drag->start_grab (event);
+                       _drags->set (new ControlPointDrag (this, item), event);
                        return true;
                        break;
 
@@ -905,16 +944,12 @@ Editor::button_press_handler_2 (ArdourCanvas::Item* item, GdkEvent* event, ItemT
 
                switch (item_type) {
                case RegionViewNameHighlight:
-                       assert (_drag == 0);
-                       _drag = new TrimDrag (this, item, clicked_regionview, selection->regions.by_layer());
-                       _drag->start_grab (event);
+                       _drags->set (new TrimDrag (this, item, clicked_regionview, selection->regions.by_layer()), event);
                        return true;
                        break;
 
                case RegionViewName:
-                       assert (_drag == 0);
-                       _drag = new TrimDrag (this, clicked_regionview->get_name_highlight(), clicked_regionview, selection->regions.by_layer());
-                       _drag->start_grab (event);
+                       _drags->set (new TrimDrag (this, clicked_regionview->get_name_highlight(), clicked_regionview, selection->regions.by_layer()), event);
                        return true;
                        break;
 
@@ -973,13 +1008,13 @@ Editor::button_press_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemTyp
 
        track_canvas->grab_focus();
 
-       if (session && session->actively_recording()) {
+       if (_session && _session->actively_recording()) {
                return true;
        }
 
        button_selection (item, event, item_type);
 
-       if (_drag == 0 &&
+       if (!_drags->active () &&
            (Keyboard::is_delete_event (&event->button) ||
             Keyboard::is_context_menu_event (&event->button) ||
             Keyboard::is_edit_event (&event->button))) {
@@ -1016,17 +1051,15 @@ Editor::button_release_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemT
 
        /* no action if we're recording */
 
-       if (session && session->actively_recording()) {
+       if (_session && _session->actively_recording()) {
                return true;
        }
 
        /* first, see if we're finishing a drag ... */
 
        bool were_dragging = false;
-       if (_drag) {
-               bool const r = _drag->end_grab (event);
-               delete _drag;
-               _drag = 0;
+       if (_drags->active ()) {
+               bool const r = _drags->end_grab (event);
                if (r) {
                        /* grab dragged, so do nothing else */
                        return true;
@@ -1039,7 +1072,7 @@ Editor::button_release_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemT
 
        /* edit events get handled here */
 
-       if (_drag == 0 && Keyboard::is_edit_event (&event->button)) {
+       if (!_drags->active () && Keyboard::is_edit_event (&event->button)) {
                switch (item_type) {
                case RegionItem:
                        edit_region ();
@@ -1073,7 +1106,7 @@ Editor::button_release_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemT
 
        if (Keyboard::is_context_menu_event (&event->button)) {
 
-               if (_drag == 0) {
+               if (!_drags->active ()) {
 
                        /* no matter which button pops up the context menu, tell the menu
                           widget to use button 1 to drive menu selection.
@@ -1119,11 +1152,11 @@ Editor::button_release_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemT
                                break;
 
                        case TempoMarkerItem:
-                               tm_marker_context_menu (&event->button, item);
+                               tempo_or_meter_marker_context_menu (&event->button, item);
                                break;
 
                        case MeterMarkerItem:
-                               tm_marker_context_menu (&event->button, item);
+                               tempo_or_meter_marker_context_menu (&event->button, item);
                                break;
 
                        case CrossfadeViewItem:
@@ -1155,7 +1188,9 @@ Editor::button_release_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemT
 
        /* delete events get handled here */
 
-       if (_drag == 0 && Keyboard::is_delete_event (&event->button)) {
+       Editing::MouseMode const eff = effective_mouse_mode ();
+
+       if (!_drags->active () && Keyboard::is_delete_event (&event->button)) {
 
                switch (item_type) {
                case TempoMarkerItem:
@@ -1171,13 +1206,13 @@ Editor::button_release_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemT
                        break;
 
                case RegionItem:
-                       if (mouse_mode == MouseObject) {
+                       if (eff == MouseObject) {
                                remove_clicked_region ();
                        }
                        break;
 
                case ControlPointItem:
-                       if (mouse_mode == MouseGain) {
+                       if (eff == MouseGain) {
                                remove_gain_control_point (item, event);
                        } else {
                                remove_control_point (item, event);
@@ -1236,7 +1271,7 @@ Editor::button_release_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemT
                        break;
                }
 
-               switch (mouse_mode) {
+               switch (eff) {
                case MouseObject:
                        switch (item_type) {
                        case AutomationTrackItem:
@@ -1294,7 +1329,7 @@ Editor::button_release_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemT
                                }
                        } else {
                                /* make sure we stop */
-                               session->request_transport_speed (0.0);
+                               _session->request_transport_speed (0.0);
                        }
                        break;
 
@@ -1308,7 +1343,7 @@ Editor::button_release_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemT
 
 
        case 2:
-               switch (mouse_mode) {
+               switch (eff) {
 
                case MouseObject:
                        switch (item_type) {
@@ -1351,7 +1386,7 @@ Editor::button_release_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemT
 }
 
 bool
-Editor::enter_handler (ArdourCanvas::Item* item, GdkEvent* /*event*/, ItemType item_type)
+Editor::enter_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type)
 {
        ControlPoint* cp;
        Marker * marker;
@@ -1371,13 +1406,13 @@ Editor::enter_handler (ArdourCanvas::Item* item, GdkEvent* /*event*/, ItemType i
                        double at_x, at_y;
                        at_x = cp->get_x();
                        at_y = cp->get_y ();
-                       cp->item()->i2w (at_x, at_y);
+                       cp->i2w (at_x, at_y);
                        at_x += 10.0;
                        at_y += 10.0;
 
                        fraction = 1.0 - (cp->get_y() / cp->line().height());
 
-                       if (is_drawable() && dynamic_cast<ScrubDrag*> (_drag) == 0) {
+                       if (is_drawable() && !_drags->active ()) {
                                track_canvas->get_window()->set_cursor (*fader_cursor);
                        }
 
@@ -1516,6 +1551,7 @@ Editor::enter_handler (ArdourCanvas::Item* item, GdkEvent* /*event*/, ItemType i
                                rect->property_fill_color_rgba() = 0;
                                rect->property_outline_pixels() = 1;
                        }
+                       track_canvas->get_window()->set_cursor (*grabber_cursor);
                }
                break;
 
@@ -1547,7 +1583,7 @@ Editor::enter_handler (ArdourCanvas::Item* item, GdkEvent* /*event*/, ItemType i
 }
 
 bool
-Editor::leave_handler (ArdourCanvas::Item* item, GdkEvent* /*event*/, ItemType item_type)
+Editor::leave_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type)
 {
        AutomationLine* al;
        ControlPoint* cp;
@@ -1650,13 +1686,14 @@ Editor::leave_handler (ArdourCanvas::Item* item, GdkEvent* /*event*/, ItemType i
                                rect->property_outline_pixels() = 0;
                        }
                }
+               track_canvas->get_window()->set_cursor (*current_canvas_cursor);
                break;
 
        case AutomationTrackItem:
                if (is_drawable()) {
                        track_canvas->get_window()->set_cursor (*current_canvas_cursor);
                        clear_entered_track = true;
-                       Glib::signal_idle().connect (mem_fun(*this, &Editor::left_automation_track));
+                       Glib::signal_idle().connect (sigc::mem_fun(*this, &Editor::left_automation_track));
                }
                break;
 
@@ -1678,19 +1715,19 @@ Editor::left_automation_track ()
 }
 
 void
-Editor::scrub ()
+Editor::scrub (nframes64_t frame, double current_x)
 {
        double delta;
 
        if (scrubbing_direction == 0) {
                /* first move */
-               session->request_locate (_drag->current_pointer_frame(), false);
-               session->request_transport_speed (0.1);
+               _session->request_locate (frame, false);
+               _session->request_transport_speed (0.1);
                scrubbing_direction = 1;
 
        } else {
 
-               if (last_scrub_x > _drag->current_pointer_x()) {
+               if (last_scrub_x > current_x) {
 
                        /* pointer moved to the left */
 
@@ -1699,7 +1736,7 @@ Editor::scrub ()
                                /* we reversed direction to go backwards */
 
                                scrub_reversals++;
-                               scrub_reverse_distance += (int) (last_scrub_x - _drag->current_pointer_x());
+                               scrub_reverse_distance += (int) (last_scrub_x - current_x);
 
                        } else {
 
@@ -1708,8 +1745,8 @@ Editor::scrub ()
                                scrub_reversals = 0;
                                scrub_reverse_distance = 0;
 
-                               delta = 0.01 * (last_scrub_x - _drag->current_pointer_x());
-                               session->request_transport_speed (session->transport_speed() - delta);
+                               delta = 0.01 * (last_scrub_x - current_x);
+                               _session->request_transport_speed (_session->transport_speed() - delta);
                        }
 
                } else {
@@ -1719,7 +1756,7 @@ Editor::scrub ()
                                /* we reversed direction to go forward */
 
                                scrub_reversals++;
-                               scrub_reverse_distance += (int) (_drag->current_pointer_x() - last_scrub_x);
+                               scrub_reverse_distance += (int) (current_x - last_scrub_x);
 
                        } else {
                                /* still moving to the right */
@@ -1727,8 +1764,8 @@ Editor::scrub ()
                                scrub_reversals = 0;
                                scrub_reverse_distance = 0;
 
-                               delta = 0.01 * (_drag->current_pointer_x() - last_scrub_x);
-                               session->request_transport_speed (session->transport_speed() + delta);
+                               delta = 0.01 * (current_x - last_scrub_x);
+                               _session->request_transport_speed (_session->transport_speed() + delta);
                        }
                }
 
@@ -1740,11 +1777,11 @@ Editor::scrub ()
 
                        if (scrubbing_direction > 0) {
                                /* was forwards, go backwards */
-                               session->request_transport_speed (-0.1);
+                               _session->request_transport_speed (-0.1);
                                scrubbing_direction = -1;
                        } else {
                                /* was backwards, go forwards */
-                               session->request_transport_speed (0.1);
+                               _session->request_transport_speed (0.1);
                                scrubbing_direction = 1;
                        }
 
@@ -1753,7 +1790,7 @@ Editor::scrub ()
                }
        }
 
-       last_scrub_x = _drag->current_pointer_x();
+       last_scrub_x = current_x;
 }
 
 bool
@@ -1780,14 +1817,20 @@ Editor::motion_handler (ArdourCanvas::Item* /*item*/, GdkEvent* event, bool from
                step_timeout.disconnect ();
        }
 
-       if (session && session->actively_recording()) {
+       if (_session && _session->actively_recording()) {
                /* Sorry. no dragging stuff around while we record */
                return true;
        }
 
+       JoinObjectRangeState const old = _join_object_range_state;
+       update_join_object_range_location (event->motion.x, event->motion.y);
+       if (_join_object_range_state != old) {
+               set_canvas_cursor ();
+       }
+
        bool handled = false;
-       if (_drag) {
-               handled = _drag->motion_handler (event, from_autoscroll);
+       if (_drags->active ()) {
+               handled = _drags->motion_handler (event, from_autoscroll);
        }
 
        if (!handled) {
@@ -1887,7 +1930,7 @@ Editor::region_view_item_click (AudioRegionView& rv, GdkEventButton* event)
                RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*>(tv);
                double speed = 1.0;
                if (rtv && rtv->is_track()) {
-                       speed = rtv->get_diskstream()->speed();
+                       speed = rtv->track()->speed();
                }
 
                nframes64_t where = get_preferred_edit_position();
@@ -1920,7 +1963,7 @@ Editor::show_verbose_time_cursor (nframes64_t frame, double offset, double xpos,
        nframes64_t frame_rate;
        float secs;
 
-       if (session == 0) {
+       if (_session == 0) {
                return;
        }
 
@@ -1934,18 +1977,18 @@ Editor::show_verbose_time_cursor (nframes64_t frame, double offset, double xpos,
 
        switch (m) {
        case AudioClock::BBT:
-               session->bbt_time (frame, bbt);
+               _session->bbt_time (frame, bbt);
                snprintf (buf, sizeof (buf), "%02" PRIu32 "|%02" PRIu32 "|%02" PRIu32, bbt.bars, bbt.beats, bbt.ticks);
                break;
 
        case AudioClock::Timecode:
-               session->timecode_time (frame, timecode);
+               _session->timecode_time (frame, timecode);
                snprintf (buf, sizeof (buf), "%02" PRId32 ":%02" PRId32 ":%02" PRId32 ":%02" PRId32, timecode.hours, timecode.minutes, timecode.seconds, timecode.frames);
                break;
 
        case AudioClock::MinSec:
                /* XXX this is copied from show_verbose_duration_cursor() */
-               frame_rate = session->frame_rate();
+               frame_rate = _session->frame_rate();
                hours = frame / (frame_rate * 3600);
                frame = frame % (frame_rate * 3600);
                mins = frame / (frame_rate * 60);
@@ -1961,9 +2004,8 @@ Editor::show_verbose_time_cursor (nframes64_t frame, double offset, double xpos,
 
        if (xpos >= 0 && ypos >=0) {
                set_verbose_canvas_cursor (buf, xpos + offset, ypos + offset);
-       }
-       else {
-               set_verbose_canvas_cursor (buf, _drag->current_pointer_x() + offset - horizontal_adjustment.get_value(), _drag->current_pointer_y() + offset - vertical_adjustment.get_value() + canvas_timebars_vsize);
+       } else {
+               set_verbose_canvas_cursor (buf, _drags->current_pointer_x() + offset - horizontal_position(), _drags->current_pointer_y() + offset - vertical_adjustment.get_value() + canvas_timebars_vsize);
        }
        show_verbose_canvas_cursor ();
 }
@@ -1978,9 +2020,9 @@ Editor::show_verbose_duration_cursor (nframes64_t start, nframes64_t end, double
        int hours, mins;
        nframes64_t distance, frame_rate;
        float secs;
-       Meter meter_at_start(session->tempo_map().meter_at(start));
+       Meter meter_at_start(_session->tempo_map().meter_at(start));
 
-       if (session == 0) {
+       if (_session == 0) {
                return;
        }
 
@@ -1994,8 +2036,8 @@ Editor::show_verbose_duration_cursor (nframes64_t start, nframes64_t end, double
 
        switch (m) {
        case AudioClock::BBT:
-               session->bbt_time (start, sbbt);
-               session->bbt_time (end, ebbt);
+               _session->bbt_time (start, sbbt);
+               _session->bbt_time (end, ebbt);
 
                /* subtract */
                /* XXX this computation won't work well if the
@@ -2020,14 +2062,14 @@ Editor::show_verbose_duration_cursor (nframes64_t start, nframes64_t end, double
                break;
 
        case AudioClock::Timecode:
-               session->timecode_duration (end - start, timecode);
+               _session->timecode_duration (end - start, timecode);
                snprintf (buf, sizeof (buf), "%02" PRId32 ":%02" PRId32 ":%02" PRId32 ":%02" PRId32, timecode.hours, timecode.minutes, timecode.seconds, timecode.frames);
                break;
 
        case AudioClock::MinSec:
                /* XXX this stuff should be elsewhere.. */
                distance = end - start;
-               frame_rate = session->frame_rate();
+               frame_rate = _session->frame_rate();
                hours = distance / (frame_rate * 3600);
                distance = distance % (frame_rate * 3600);
                mins = distance / (frame_rate * 60);
@@ -2045,7 +2087,7 @@ Editor::show_verbose_duration_cursor (nframes64_t start, nframes64_t end, double
                set_verbose_canvas_cursor (buf, xpos + offset, ypos + offset);
        }
        else {
-               set_verbose_canvas_cursor (buf, _drag->current_pointer_x() + offset, _drag->current_pointer_y() + offset);
+               set_verbose_canvas_cursor (buf, _drags->current_pointer_x() + offset, _drags->current_pointer_y() + offset);
        }
 
        show_verbose_canvas_cursor ();
@@ -2077,7 +2119,7 @@ Editor::cancel_selection ()
 
 
 void
-Editor::single_contents_trim (RegionView& rv, nframes64_t frame_delta, bool left_direction, bool swap_direction, bool obey_snap)
+Editor::single_contents_trim (RegionView& rv, nframes64_t frame_delta, bool left_direction, bool swap_direction)
 {
        boost::shared_ptr<Region> region (rv.region());
 
@@ -2092,7 +2134,7 @@ Editor::single_contents_trim (RegionView& rv, nframes64_t frame_delta, bool left
        RouteTimeAxisView* tv = dynamic_cast<RouteTimeAxisView*>(tvp);
 
        if (tv && tv->is_track()) {
-               speed = tv->get_diskstream()->speed();
+               speed = tv->track()->speed();
        }
 
        if (left_direction) {
@@ -2109,15 +2151,12 @@ Editor::single_contents_trim (RegionView& rv, nframes64_t frame_delta, bool left
                }
        }
 
-       if (obey_snap) {
-               snap_to (new_bound);
-       }
        region->trim_start ((nframes64_t) (new_bound * speed), this);
-       rv.region_changed (StartChanged);
+       rv.region_changed (PropertyChange (ARDOUR::Properties::start));
 }
 
 void
-Editor::single_start_trim (RegionView& rv, nframes64_t frame_delta, bool left_direction, bool obey_snap, bool no_overlap)
+Editor::single_start_trim (RegionView& rv, nframes64_t new_bound, bool no_overlap)
 {
        boost::shared_ptr<Region> region (rv.region());
 
@@ -2125,24 +2164,12 @@ Editor::single_start_trim (RegionView& rv, nframes64_t frame_delta, bool left_di
                return;
        }
 
-       nframes64_t new_bound;
-
        double speed = 1.0;
        TimeAxisView* tvp = clicked_axisview;
        RouteTimeAxisView* tv = dynamic_cast<RouteTimeAxisView*>(tvp);
 
        if (tv && tv->is_track()) {
-               speed = tv->get_diskstream()->speed();
-       }
-
-       if (left_direction) {
-               new_bound = (nframes64_t) (region->position()/speed) - frame_delta;
-       } else {
-               new_bound = (nframes64_t) (region->position()/speed) + frame_delta;
-       }
-
-       if (obey_snap) {
-               snap_to (new_bound, (left_direction ? 0 : 1));
+               speed = tv->track()->speed();
        }
 
        nframes64_t pre_trim_first_frame = region->first_frame();
@@ -2164,17 +2191,15 @@ Editor::single_start_trim (RegionView& rv, nframes64_t frame_delta, bool left_di
                if (region_left != 0 &&
                        (region_left->last_frame() > region->first_frame() || regions_touching))
                {
-                       region_left->trim_end(region->first_frame(), this);
+                       region_left->trim_end(region->first_frame() - 1, this);
                }
        }
 
-
-
-       rv.region_changed (Change (LengthChanged|PositionChanged|StartChanged));
+       rv.region_changed (ARDOUR::bounds_change);
 }
 
 void
-Editor::single_end_trim (RegionView& rv, nframes64_t frame_delta, bool left_direction, bool obey_snap, bool no_overlap)
+Editor::single_end_trim (RegionView& rv, nframes64_t new_bound, bool no_overlap)
 {
        boost::shared_ptr<Region> region (rv.region());
 
@@ -2182,24 +2207,12 @@ Editor::single_end_trim (RegionView& rv, nframes64_t frame_delta, bool left_dire
                return;
        }
 
-       nframes64_t new_bound;
-
        double speed = 1.0;
        TimeAxisView* tvp = clicked_axisview;
        RouteTimeAxisView* tv = dynamic_cast<RouteTimeAxisView*>(tvp);
 
        if (tv && tv->is_track()) {
-               speed = tv->get_diskstream()->speed();
-       }
-
-       if (left_direction) {
-               new_bound = (nframes64_t) ((region->last_frame() + 1)/speed) - frame_delta;
-       } else {
-               new_bound = (nframes64_t) ((region->last_frame() + 1)/speed) + frame_delta;
-       }
-
-       if (obey_snap) {
-               snap_to (new_bound);
+               speed = tv->track()->speed();
        }
 
        nframes64_t pre_trim_last_frame = region->last_frame();
@@ -2213,8 +2226,8 @@ Editor::single_end_trim (RegionView& rv, nframes64_t frame_delta, bool left_dire
 
                bool regions_touching = false;
 
-               if (region_right != 0 && (pre_trim_last_frame == region_right->first_frame() - 1)){
-                   regions_touching = true;
+               if (region_right != 0 && (pre_trim_last_frame == region_right->first_frame() - 1)) {
+                       regions_touching = true;
                }
 
                //Only trim region on the right if the last frame has gone beyond the right region's first frame.
@@ -2224,23 +2237,19 @@ Editor::single_end_trim (RegionView& rv, nframes64_t frame_delta, bool left_dire
                        region_right->trim_front(region->last_frame() + 1, this);
                }
 
-               rv.region_changed (Change (LengthChanged|PositionChanged|StartChanged));
-       }
-       else {
-               rv.region_changed (LengthChanged);
+               rv.region_changed (ARDOUR::bounds_change);
+                       
+       else {
+               rv.region_changed (PropertyChange (ARDOUR::Properties::length));
        }
 }
 
 
 void
-Editor::point_trim (GdkEvent* event)
+Editor::point_trim (GdkEvent* event, nframes64_t new_bound)
 {
        RegionView* rv = clicked_regionview;
 
-       nframes64_t new_bound = _drag->current_pointer_frame();
-
-       snap_to_with_modifier (new_bound, event);
-
        /* Choose action dependant on which button was pressed */
        switch (event->button.button) {
        case 1:
@@ -2255,23 +2264,17 @@ Editor::point_trim (GdkEvent* event)
                                }
 
                                if (!(*i)->region()->locked()) {
-                                       boost::shared_ptr<Playlist> pl = (*i)->region()->playlist();
-                                       XMLNode &before = pl->get_state();
-
+                                       (*i)->region()->clear_history ();
                                        (*i)->region()->trim_front (new_bound, this);
-
-                                       XMLNode &after = pl->get_state();
-                                       session->add_command(new MementoCommand<Playlist>(*pl.get(), &before, &after));
+                                       _session->add_command(new StatefulDiffCommand ((*i)->region()));
                                }
                        }
 
                } else {
                        if (!rv->region()->locked()) {
-                               boost::shared_ptr<Playlist> pl = rv->region()->playlist();
-                               XMLNode &before = pl->get_state();
+                               rv->region()->clear_history ();
                                rv->region()->trim_front (new_bound, this);
-                               XMLNode &after = pl->get_state();
-                               session->add_command(new MementoCommand<Playlist>(*pl.get(), &before, &after));
+                               _session->add_command(new StatefulDiffCommand (rv->region()));
                        }
                }
 
@@ -2286,22 +2289,18 @@ Editor::point_trim (GdkEvent* event)
                        for (list<RegionView*>::const_iterator i = selection->regions.by_layer().begin(); i != selection->regions.by_layer().end(); ++i)
                        {
                                if (!(*i)->region()->locked()) {
-                                       boost::shared_ptr<Playlist> pl = (*i)->region()->playlist();
-                                       XMLNode &before = pl->get_state();
+                                       (*i)->region()->clear_history();
                                        (*i)->region()->trim_end (new_bound, this);
-                                       XMLNode &after = pl->get_state();
-                                       session->add_command(new MementoCommand<Playlist>(*pl.get(), &before, &after));
+                                       _session->add_command(new StatefulDiffCommand ((*i)->region()));
                                }
                        }
 
                } else {
 
                        if (!rv->region()->locked()) {
-                               boost::shared_ptr<Playlist> pl = rv->region()->playlist();
-                               XMLNode &before = pl->get_state();
+                               rv->region()->clear_history ();
                                rv->region()->trim_end (new_bound, this);
-                               XMLNode &after = pl->get_state();
-                               session->add_command (new MementoCommand<Playlist>(*pl.get(), &before, &after));
+                               _session->add_command (new StatefulDiffCommand (rv->region()));
                        }
                }
 
@@ -2322,7 +2321,7 @@ Editor::thaw_region_after_trim (RegionView& rv)
                return;
        }
 
-       region->thaw (_("trimmed region"));
+       region->resume_property_changes ();
 
        AudioRegionView* arv = dynamic_cast<AudioRegionView*>(&rv);
 
@@ -2419,16 +2418,16 @@ Editor::mouse_brush_insert_region (RegionView* rv, nframes64_t pos)
        }
 
        boost::shared_ptr<Playlist> playlist = rtv->playlist();
-       double speed = rtv->get_diskstream()->speed();
+       double speed = rtv->track()->speed();
 
-       XMLNode &before = playlist->get_state();
-       playlist->add_region (RegionFactory::create (rv->region()), (nframes64_t) (pos * speed));
-       XMLNode &after = playlist->get_state();
-       session->add_command(new MementoCommand<Playlist>(*playlist.get(), &before, &after));
+        playlist->clear_history ();
+       boost::shared_ptr<Region> new_region (RegionFactory::create (rv->region()));
+        playlist->add_region (new_region, (nframes64_t) (pos * speed));
+       _session->add_command (new StatefulDiffCommand (playlist));
 
-       // playlist is frozen, so we have to update manually
+       // playlist is frozen, so we have to update manually XXX this is disgusting
 
-       playlist->Modified(); /* EMIT SIGNAL */
+       playlist->RegionAdded (new_region); /* EMIT SIGNAL */
 }
 
 gint
@@ -2442,55 +2441,45 @@ Editor::track_height_step_timeout ()
 }
 
 void
-Editor::start_region_grab (ArdourCanvas::Item* item, GdkEvent* event, RegionView* region_view)
+Editor::add_region_drag (ArdourCanvas::Item* item, GdkEvent* event, RegionView* region_view)
 {
        assert (region_view);
 
        _region_motion_group->raise_to_top ();
 
-       assert (_drag == 0);
-
        if (Config->get_edit_mode() == Splice) {
-               _drag = new RegionSpliceDrag (this, item, region_view, selection->regions.by_layer());
+               _drags->add (new RegionSpliceDrag (this, item, region_view, selection->regions.by_layer()));
        } else {
-               RegionSelection s = get_equivalent_regions (selection->regions, RouteGroup::Edit);
-               _drag = new RegionMoveDrag (this, item, region_view, s.by_layer(), false, false);
+               RegionSelection s = get_equivalent_regions (selection->regions, ARDOUR::Properties::edit.property_id);
+               _drags->add (new RegionMoveDrag (this, item, region_view, s.by_layer(), false, false));
        }
 
-       _drag->start_grab (event);
-
-       begin_reversible_command (_("move region(s)"));
-
        /* sync the canvas to what we think is its current state */
        update_canvas_now();
 }
 
 void
-Editor::start_region_copy_grab (ArdourCanvas::Item* item, GdkEvent* event, RegionView* region_view)
+Editor::add_region_copy_drag (ArdourCanvas::Item* item, GdkEvent* event, RegionView* region_view)
 {
        assert (region_view);
-       assert (_drag == 0);
 
        _region_motion_group->raise_to_top ();
 
-       RegionSelection s = get_equivalent_regions (selection->regions, RouteGroup::Edit);
-       _drag = new RegionMoveDrag (this, item, region_view, s.by_layer(), false, true);
-       _drag->start_grab(event);
+       RegionSelection s = get_equivalent_regions (selection->regions, ARDOUR::Properties::edit.property_id);
+       _drags->add (new RegionMoveDrag (this, item, region_view, s.by_layer(), false, true));
 }
 
 void
-Editor::start_region_brush_grab (ArdourCanvas::Item* item, GdkEvent* event, RegionView* region_view)
+Editor::add_region_brush_drag (ArdourCanvas::Item* item, GdkEvent* event, RegionView* region_view)
 {
        assert (region_view);
-       assert (_drag == 0);
 
        if (Config->get_edit_mode() == Splice) {
                return;
        }
 
-       RegionSelection s = get_equivalent_regions (selection->regions, RouteGroup::Edit);
-       _drag = new RegionMoveDrag (this, item, region_view, s.by_layer(), true, false);
-       _drag->start_grab (event);
+       RegionSelection s = get_equivalent_regions (selection->regions, ARDOUR::Properties::edit.property_id);
+       _drags->add (new RegionMoveDrag (this, item, region_view, s.by_layer(), true, false));
 
        begin_reversible_command (_("Drag region brush"));
 }
@@ -2527,7 +2516,7 @@ Editor::start_selection_grab (ArdourCanvas::Item* /*item*/, GdkEvent* event)
        */
 
        latest_regionviews.clear();
-       sigc::connection c = clicked_routeview->view()->RegionViewAdded.connect (mem_fun(*this, &Editor::collect_new_region_view));
+       sigc::connection c = clicked_routeview->view()->RegionViewAdded.connect (sigc::mem_fun(*this, &Editor::collect_new_region_view));
 
        /* A selection grab currently creates two undo/redo operations, one for
           creating the new region and another for moving it.
@@ -2537,10 +2526,9 @@ Editor::start_selection_grab (ArdourCanvas::Item* /*item*/, GdkEvent* event)
 
        boost::shared_ptr<Playlist> playlist = clicked_axisview->playlist();
 
-       XMLNode *before = &(playlist->get_state());
+        playlist->clear_history ();
        clicked_routeview->playlist()->add_region (region, selection->time[clicked_selection].start);
-       XMLNode *after = &(playlist->get_state());
-       session->add_command(new MementoCommand<Playlist>(*playlist, before, after));
+       _session->add_command(new StatefulDiffCommand (playlist));
 
        commit_reversible_command ();
 
@@ -2556,16 +2544,16 @@ Editor::start_selection_grab (ArdourCanvas::Item* /*item*/, GdkEvent* event)
        */
        selection->set (latest_regionviews);
 
-       assert (_drag == 0);
-       _drag = new RegionMoveDrag (this, latest_regionviews.front()->get_canvas_group(), latest_regionviews.front(), latest_regionviews, false, false);
-       _drag->start_grab (event);
+       _drags->set (new RegionMoveDrag (this, latest_regionviews.front()->get_canvas_group(), latest_regionviews.front(), latest_regionviews, false, false), event);
 }
 
 void
-Editor::break_drag ()
+Editor::escape ()
 {
-       if (_drag) {
-               _drag->break_drag ();
+       if (_drags->active ()) {
+               _drags->abort ();
+       } else {
+               selection->clear ();
        }
 }
 
@@ -2604,3 +2592,56 @@ Editor::set_internal_edit (bool yn)
 
 
 }
+
+/** Update _join_object_range_state which indicate whether we are over the top or bottom half of a region view,
+ *  used by the `join object/range' tool mode.
+ */
+void
+Editor::update_join_object_range_location (double x, double y)
+{
+       /* XXX: actually, this decides based on whether the mouse is in the top or bottom half of a RouteTimeAxisView;
+          entered_{track,regionview} is not always setup (e.g. if the mouse is over a TimeSelection), and to get a Region
+          that we're over requires searching the playlist.
+       */
+          
+       if (join_object_range_button.get_active() == false || (mouse_mode != MouseRange && mouse_mode != MouseObject)) {
+               _join_object_range_state = JOIN_OBJECT_RANGE_NONE;
+               return;
+       }
+       
+       if (mouse_mode == MouseObject) {
+               _join_object_range_state = JOIN_OBJECT_RANGE_OBJECT;
+       } else if (mouse_mode == MouseRange) {
+               _join_object_range_state = JOIN_OBJECT_RANGE_RANGE;
+       }
+
+       /* XXX: maybe we should make entered_track work in all cases, rather than resorting to this */
+       pair<TimeAxisView*, int> tvp = trackview_by_y_position (y + vertical_adjustment.get_value() - canvas_timebars_vsize);
+       
+       if (tvp.first) {
+
+               RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*> (tvp.first);
+               if (rtv) {
+
+                       double cx = 0;
+                       double cy = y;
+                       rtv->canvas_display()->w2i (cx, cy);
+
+                       bool const top_half = cy < rtv->current_height () / 2;
+                       
+                       _join_object_range_state = top_half ? JOIN_OBJECT_RANGE_RANGE : JOIN_OBJECT_RANGE_OBJECT;
+               }
+       }
+}
+
+Editing::MouseMode
+Editor::effective_mouse_mode () const
+{
+       if (_join_object_range_state == JOIN_OBJECT_RANGE_OBJECT) {
+               return MouseObject;
+       } else if (_join_object_range_state == JOIN_OBJECT_RANGE_RANGE) {
+               return MouseRange;
+       }
+
+       return mouse_mode;
+}