Fix scrollwheel operation in editor.
[ardour.git] / gtk2_ardour / automation_time_axis.cc
index f0bcaa30ba07b313d186de498813a44f591c7e16..eaed1e519951e80127ea4a8e42488392fc64219d 100644 (file)
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2000-2007 Paul Davis 
+    Copyright (C) 2000-2007 Paul Davis
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
 */
 
 #include <utility>
-#include <ardour/route.h>
-#include <ardour/automation_control.h>
-#include <pbd/memento_command.h>
 #include <gtkmm2ext/barcontroller.h>
+#include "pbd/memento_command.h"
+#include "ardour/automation_control.h"
+#include "ardour/event_type_map.h"
+#include "ardour/route.h"
+#include "ardour/session.h"
 
 #include "ardour_ui.h"
 #include "automation_time_axis.h"
@@ -39,6 +41,7 @@
 
 #include "i18n.h"
 
+using namespace std;
 using namespace ARDOUR;
 using namespace PBD;
 using namespace Gtk;
@@ -49,6 +52,7 @@ Pango::FontDescription* AutomationTimeAxisView::name_font = 0;
 bool AutomationTimeAxisView::have_name_font = false;
 const string AutomationTimeAxisView::state_node_name = "AutomationChild";
 
+
 /** \a a the automatable object this time axis is to display data for.
  * For route/track automation (e.g. gain) pass the route for both \r and \a.
  * For route child (e.g. plugin) automation, pass the child for \a.
@@ -58,7 +62,7 @@ AutomationTimeAxisView::AutomationTimeAxisView (Session& s, boost::shared_ptr<Ro
                boost::shared_ptr<Automatable> a, boost::shared_ptr<AutomationControl> c,
                PublicEditor& e, TimeAxisView& parent, bool show_regions,
                ArdourCanvas::Canvas& canvas, const string & nom, const string & nomparent)
-       : AxisView (s), 
+       : AxisView (s),
          TimeAxisView (s, e, &parent, canvas),
          _route (r),
          _control (c),
@@ -67,7 +71,6 @@ AutomationTimeAxisView::AutomationTimeAxisView (Session& s, boost::shared_ptr<Ro
          _base_rect (0),
          _view (show_regions ? new AutomationStreamView(*this) : NULL),
          _name (nom),
-         clear_button (_("clear")),
          auto_button (X_("")) /* force addition of a label */
 {
        if (!have_name_font) {
@@ -85,38 +88,38 @@ AutomationTimeAxisView::AutomationTimeAxisView (Session& s, boost::shared_ptr<Ro
 
        ignore_state_request = false;
        first_call_to_set_height = true;
-       
-       _base_rect = new SimpleRect(*canvas_display);
+
+       _base_rect = new SimpleRect(*_canvas_display);
        _base_rect->property_x1() = 0.0;
        _base_rect->property_y1() = 0.0;
        _base_rect->property_x2() = LONG_MAX - 2;
        _base_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_AutomationTrackOutline.get();
-       
+
        /* outline ends and bottom */
        _base_rect->property_outline_what() = (guint32) (0x1|0x2|0x8);
        _base_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_AutomationTrackFill.get();
-       
+
        _base_rect->set_data ("trackview", this);
 
-       _base_rect->signal_event().connect (bind (mem_fun (editor, &PublicEditor::canvas_automation_track_event),
-                                                _base_rect, this));
+       _base_rect->signal_event().connect (bind (
+                       mem_fun (_editor, &PublicEditor::canvas_automation_track_event),
+                       _base_rect, this));
 
-       _base_rect->lower_to_bottom();
+       if (!a) {
+               _base_rect->lower_to_bottom();
+       }
 
        hide_button.add (*(manage (new Gtk::Image (::get_icon("hide")))));
 
        auto_button.set_name ("TrackVisualButton");
-       clear_button.set_name ("TrackVisualButton");
        hide_button.set_name ("TrackRemoveButton");
 
        auto_button.unset_flags (Gtk::CAN_FOCUS);
-       clear_button.unset_flags (Gtk::CAN_FOCUS);
        hide_button.unset_flags (Gtk::CAN_FOCUS);
 
        controls_table.set_no_show_all();
 
        ARDOUR_UI::instance()->tooltips().set_tip(auto_button, _("automation state"));
-       ARDOUR_UI::instance()->tooltips().set_tip(clear_button, _("clear track"));
        ARDOUR_UI::instance()->tooltips().set_tip(hide_button, _("hide track"));
 
        /* rearrange the name display */
@@ -151,7 +154,7 @@ AutomationTimeAxisView::AutomationTimeAxisView (Session& s, boost::shared_ptr<Ro
                        shortened = true;
                }
 
-               plugname = new Label (pname);
+               plugname = new Label (pname);
                plugname->set_name (X_("TrackPlugName"));
                plugname->show();
                name_label.set_name (X_("TrackParameterName"));
@@ -172,19 +175,17 @@ AutomationTimeAxisView::AutomationTimeAxisView (Session& s, boost::shared_ptr<Ro
                tipname += _name;
                ARDOUR_UI::instance()->tooltips().set_tip(controls_ebox, tipname);
        }
-       
+
        /* add the buttons */
        controls_table.attach (hide_button, 0, 1, 0, 1, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND);
 
        controls_table.attach (auto_button, 5, 8, 0, 1, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND);
-       controls_table.attach (clear_button, 5, 8, 1, 2, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND);
-       
+
        /* add bar controller */
-       controls_table.attach (*_controller.get(), 0, 8, 2, 3, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND);
+       controls_table.attach (*_controller.get(), 0, 8, 1, 2, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND);
 
        controls_table.show_all ();
 
-       clear_button.signal_clicked().connect (mem_fun(*this, &AutomationTimeAxisView::clear_clicked));
        hide_button.signal_clicked().connect (mem_fun(*this, &AutomationTimeAxisView::hide_clicked));
        auto_button.signal_clicked().connect (mem_fun(*this, &AutomationTimeAxisView::auto_clicked));
 
@@ -192,28 +193,25 @@ AutomationTimeAxisView::AutomationTimeAxisView (Session& s, boost::shared_ptr<Ro
        controls_base_unselected_name = X_("AutomationTrackControlsBase");
        controls_ebox.set_name (controls_base_unselected_name);
 
-       controls_frame.set_shadow_type (Gtk::SHADOW_ETCHED_OUT);
-
        XMLNode* xml_node = get_parent_with_state()->get_automation_child_xml_node (
                        _control->parameter());
 
        if (xml_node) {
-               set_state (*xml_node);
-       } 
-               
+               set_state (*xml_node, Stateful::loading_state_version);
+       }
+
        /* ask for notifications of any new RegionViews */
        if (show_regions) {
 
                assert(_view);
                _view->attach ();
-       
+
        /* no regions, just a single line for the entire track (e.g. bus gain) */
        } else {
-       
                boost::shared_ptr<AutomationLine> line(new AutomationLine (
                                        ARDOUR::EventTypeMap::instance().to_symbol(_control->parameter()),
                                        *this,
-                                       *canvas_display,
+                                       *_canvas_display,
                                        _control->alist()));
 
                line->set_line_color (ARDOUR_UI::config()->canvasvar_ProcessorAutomationLine.get());
@@ -258,15 +256,22 @@ void
 AutomationTimeAxisView::set_automation_state (AutoState state)
 {
        if (!ignore_state_request) {
+               if (_automatable) {
+                       _automatable->set_parameter_automation_state (_control->parameter(), state);
+               }
+#if 0
                if (_route == _automatable) { // This is a time axis for route (not region) automation
                        _route->set_parameter_automation_state (_control->parameter(), state);
                }
 
                if (_control->list())
                        _control->alist()->set_automation_state(state);
+#endif
        }
-       if (_view)
+
+       if (_view) {
                _view->set_automation_state (state);
+       }
 }
 
 void
@@ -281,7 +286,7 @@ AutomationTimeAxisView::automation_state_changed ()
        } else {
                state = _control->alist()->automation_state ();
        }
-       
+
        switch (state & (Off|Play|Touch|Write)) {
        case Off:
                auto_button.set_label (_("Manual"));
@@ -335,9 +340,9 @@ AutomationTimeAxisView::automation_state_changed ()
 
 void
 AutomationTimeAxisView::interpolation_changed ()
-{      
+{
        AutomationList::InterpolationStyle style = _control->list()->interpolation();
-       
+
        if (mode_line_item && mode_discrete_item) {
                if (style == AutomationList::Discrete) {
                        mode_discrete_item->set_active(true);
@@ -347,25 +352,28 @@ AutomationTimeAxisView::interpolation_changed ()
                        mode_discrete_item->set_active(false);
                }
        }
-       
-       if (_line)
+
+       if (_line) {
                _line->set_interpolation(style);
+       }
 }
 
 void
 AutomationTimeAxisView::set_interpolation (AutomationList::InterpolationStyle style)
 {
        _control->list()->set_interpolation(style);
-       if (_line)
+       if (_line) {
                _line->set_interpolation(style);
+       }
 }
 
 void
 AutomationTimeAxisView::clear_clicked ()
 {
        _session.begin_reversible_command (_("clear automation"));
-       if (_line)
+       if (_line) {
                _line->clear ();
+       }
        _session.commit_reversible_command ();
 }
 
@@ -373,7 +381,9 @@ void
 AutomationTimeAxisView::set_height (uint32_t h)
 {
        bool changed = (height != (uint32_t) h) || first_call_to_set_height;
-       bool changed_between_small_and_normal = ( (height < hNormal && h >= hNormal) || (height >= hNormal || h < hNormal) );
+       bool changed_between_small_and_normal = (
+                  (height < hNormal && h >= hNormal)
+               || (height >= hNormal || h < hNormal) );
 
        TimeAxisView* state_parent = get_parent_with_state ();
        assert(state_parent);
@@ -381,10 +391,10 @@ AutomationTimeAxisView::set_height (uint32_t h)
 
        TimeAxisView::set_height (h);
        _base_rect->property_y2() = h;
-       
+
        if (_line)
                _line->set_height(h);
-       
+
        if (_view) {
                _view->set_height(h);
                _view->update_contents_height();
@@ -402,7 +412,7 @@ AutomationTimeAxisView::set_height (uint32_t h)
 
                if (h >= hNormal) {
                        controls_table.remove (name_hbox);
-                       
+
                        if (plugname) {
                                if (plugname_packed) {
                                        controls_table.remove (*plugname);
@@ -417,9 +427,8 @@ AutomationTimeAxisView::set_height (uint32_t h)
                        hide_name_entry ();
                        show_name_label ();
                        name_hbox.show_all ();
-                       
+
                        auto_button.show();
-                       clear_button.show();
                        hide_button.show_all();
 
                } else if (h >= hSmall) {
@@ -435,9 +444,8 @@ AutomationTimeAxisView::set_height (uint32_t h)
                        hide_name_entry ();
                        show_name_label ();
                        name_hbox.show_all ();
-                       
+
                        auto_button.hide();
-                       clear_button.hide();
                        hide_button.hide();
                }
        } else if (h >= hNormal){
@@ -457,20 +465,20 @@ AutomationTimeAxisView::set_samples_per_unit (double spu)
 
        if (_line)
                _line->reset ();
-       
+
        if (_view)
                _view->set_samples_per_unit (spu);
 }
+
 void
 AutomationTimeAxisView::hide_clicked ()
 {
        // LAME fix for refreshing the hide button
        hide_button.set_sensitive(false);
-       
+
        set_marked_for_display (false);
        hide ();
-       
+
        hide_button.set_sensitive(true);
 }
 
@@ -503,45 +511,54 @@ AutomationTimeAxisView::build_display_menu ()
        Menu* auto_state_menu = manage (new Menu);
        auto_state_menu->set_name ("ArdourContextMenu");
        MenuList& as_items = auto_state_menu->items();
-       
-       as_items.push_back (CheckMenuElem (_("Manual"), 
-                                          bind (mem_fun(*this, &AutomationTimeAxisView::set_automation_state), (AutoState) Off)));
+
+       as_items.push_back (CheckMenuElem (_("Manual"), bind (
+                       mem_fun(*this, &AutomationTimeAxisView::set_automation_state),
+                       (AutoState) Off)));
        auto_off_item = dynamic_cast<CheckMenuItem*>(&as_items.back());
 
-       as_items.push_back (CheckMenuElem (_("Play"),
-                                          bind (mem_fun(*this, &AutomationTimeAxisView::set_automation_state), (AutoState) Play)));
+       as_items.push_back (CheckMenuElem (_("Play"), bind (
+                       mem_fun(*this, &AutomationTimeAxisView::set_automation_state),
+                       (AutoState) Play)));
        auto_play_item = dynamic_cast<CheckMenuItem*>(&as_items.back());
 
-       as_items.push_back (CheckMenuElem (_("Write"),
-                                          bind (mem_fun(*this, &AutomationTimeAxisView::set_automation_state), (AutoState) Write)));
+       as_items.push_back (CheckMenuElem (_("Write"), bind (
+                       mem_fun(*this, &AutomationTimeAxisView::set_automation_state),
+                       (AutoState) Write)));
        auto_write_item = dynamic_cast<CheckMenuItem*>(&as_items.back());
 
-       as_items.push_back (CheckMenuElem (_("Touch"),
-                                          bind (mem_fun(*this, &AutomationTimeAxisView::set_automation_state), (AutoState) Touch)));
+       as_items.push_back (CheckMenuElem (_("Touch"), bind (
+                       mem_fun(*this, &AutomationTimeAxisView::set_automation_state),
+                       (AutoState) Touch)));
        auto_touch_item = dynamic_cast<CheckMenuItem*>(&as_items.back());
 
        items.push_back (MenuElem (_("State"), *auto_state_menu));
-       
+
        /* mode menu */
-       
-       if (_control->parameter().type() == MidiCCAutomation) {
+
+       if (EventTypeMap::instance().is_midi_parameter(_control->parameter())) {
+
                Menu* auto_mode_menu = manage (new Menu);
                auto_mode_menu->set_name ("ArdourContextMenu");
                MenuList& am_items = auto_mode_menu->items();
-       
+
                RadioMenuItem::Group group;
 
                am_items.push_back (RadioMenuElem (group, _("Discrete"), bind (
-                                               mem_fun(*this, &AutomationTimeAxisView::set_interpolation),
-                                               AutomationList::Discrete)));
+                               mem_fun(*this, &AutomationTimeAxisView::set_interpolation),
+                               AutomationList::Discrete)));
                mode_discrete_item = dynamic_cast<CheckMenuItem*>(&am_items.back());
-               //mode_discrete_item->set_active(_control->list()->interpolation() == AutomationList::Discrete);
+               mode_discrete_item->set_active(_control->list()->interpolation() == AutomationList::Discrete);
 
-               am_items.push_back (RadioMenuElem (group, _("Line"), bind (
-                                               mem_fun(*this, &AutomationTimeAxisView::set_interpolation),
-                                               AutomationList::Linear)));
+               am_items.push_back (RadioMenuElem (group, _("Linear"), bind (
+                               mem_fun(*this, &AutomationTimeAxisView::set_interpolation),
+                               AutomationList::Linear)));
                mode_line_item = dynamic_cast<CheckMenuItem*>(&am_items.back());
-               //mode_line_item->set_active(_control->list()->interpolation() == AutomationList::Linear);
+
+               // Set default interpolation type to linear if this isn't a (usually) discrete controller
+               if (EventTypeMap::instance().interpolation_of(_control->parameter()) == Evoral::ControlList::Linear) {
+                       mode_line_item->set_active(_control->list()->interpolation() == AutomationList::Linear);
+               }
 
                items.push_back (MenuElem (_("Mode"), *auto_mode_menu));
        }
@@ -553,14 +570,14 @@ AutomationTimeAxisView::build_display_menu ()
 }
 
 void
-AutomationTimeAxisView::add_automation_event (ArdourCanvas::Item* item, GdkEvent* event, nframes_t when, double y)
+AutomationTimeAxisView::add_automation_event (ArdourCanvas::Item* /*item*/, GdkEvent* /*event*/, nframes_t when, double y)
 {
        if (!_line)
                return;
 
        double x = 0;
 
-       canvas_display->w2i (x, y);
+       _canvas_display->w2i (x, y);
 
        /* compute vertical fractional position */
 
@@ -568,7 +585,7 @@ AutomationTimeAxisView::add_automation_event (ArdourCanvas::Item* item, GdkEvent
 
        /* map using line */
 
-       _line->view_to_model_y (y);
+       _line->view_to_model_coord (x, y);
 
        _session.begin_reversible_command (_("add automation event"));
        XMLNode& before = _control->alist()->get_state();
@@ -581,7 +598,6 @@ AutomationTimeAxisView::add_automation_event (ArdourCanvas::Item* item, GdkEvent
        _session.set_dirty ();
 }
 
-
 bool
 AutomationTimeAxisView::cut_copy_clear (Selection& selection, CutCopyOp op)
 {
@@ -600,14 +616,14 @@ AutomationTimeAxisView::cut_copy_clear_one (AutomationLine& line, Selection& sel
        switch (op) {
        case Cut:
                if ((what_we_got = alist->cut (selection.time.front().start, selection.time.front().end)) != 0) {
-                       editor.get_cut_buffer().add (what_we_got);
+                       _editor.get_cut_buffer().add (what_we_got);
                        _session.add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &alist->get_state()));
                        ret = true;
                }
                break;
        case Copy:
                if ((what_we_got = alist->copy (selection.time.front().start, selection.time.front().end)) != 0) {
-                       editor.get_cut_buffer().add (what_we_got);
+                       _editor.get_cut_buffer().add (what_we_got);
                }
                break;
 
@@ -621,9 +637,11 @@ AutomationTimeAxisView::cut_copy_clear_one (AutomationLine& line, Selection& sel
 
        if (what_we_got) {
                for (AutomationList::iterator x = what_we_got->begin(); x != what_we_got->end(); ++x) {
-                       double foo = (*x)->value;
-                       line.model_to_view_y (foo);
-                       (*x)->value = foo;
+                       double when = (*x)->when;
+                       double val  = (*x)->value;
+                       line.model_to_view_coord (when, val);
+                       (*x)->when = when;
+                       (*x)->value = val;
                }
        }
 
@@ -648,7 +666,7 @@ AutomationTimeAxisView::reset_objects_one (AutomationLine& line, PointSelection&
                if (&(*i).track != this) {
                        continue;
                }
-               
+
                alist->reset_range ((*i).start, (*i).end);
        }
 }
@@ -677,17 +695,17 @@ AutomationTimeAxisView::cut_copy_clear_objects_one (AutomationLine& line, PointS
                switch (op) {
                case Cut:
                        if ((what_we_got = alist->cut ((*i).start, (*i).end)) != 0) {
-                               editor.get_cut_buffer().add (what_we_got);
+                               _editor.get_cut_buffer().add (what_we_got);
                                _session.add_command (new MementoCommand<AutomationList>(*alist.get(), new XMLNode (before), &alist->get_state()));
                                ret = true;
                        }
                        break;
                case Copy:
                        if ((what_we_got = alist->copy ((*i).start, (*i).end)) != 0) {
-                               editor.get_cut_buffer().add (what_we_got);
+                               _editor.get_cut_buffer().add (what_we_got);
                        }
                        break;
-                       
+
                case Clear:
                        if ((what_we_got = alist->cut ((*i).start, (*i).end)) != 0) {
                                _session.add_command (new MementoCommand<AutomationList>(*alist.get(), new XMLNode (before), &alist->get_state()));
@@ -701,9 +719,11 @@ AutomationTimeAxisView::cut_copy_clear_objects_one (AutomationLine& line, PointS
 
        if (what_we_got) {
                for (AutomationList::iterator x = what_we_got->begin(); x != what_we_got->end(); ++x) {
-                       double foo = (*x)->value;
-                       line.model_to_view_y (foo);
-                       (*x)->value = foo;
+                       double when = (*x)->when;
+                       double val  = (*x)->value;
+                       line.model_to_view_coord (when, val);
+                       (*x)->when = when;
+                       (*x)->value = val;
                }
        }
 
@@ -721,8 +741,8 @@ AutomationTimeAxisView::paste_one (AutomationLine& line, nframes_t pos, float ti
 {
        AutomationSelection::iterator p;
        boost::shared_ptr<AutomationList> alist(line.the_list());
-       
-       for (p = selection.lines.begin(); p != selection.lines.end() && nth; ++p, --nth);
+
+       for (p = selection.lines.begin(); p != selection.lines.end() && nth; ++p, --nth) {}
 
        if (p == selection.lines.end()) {
                return false;
@@ -732,13 +752,15 @@ AutomationTimeAxisView::paste_one (AutomationLine& line, nframes_t pos, float ti
           values from view coordinates to model coordinates, and we're
           not supposed to modify the points in the selection.
        */
-          
+
        AutomationList copy (**p);
 
        for (AutomationList::iterator x = copy.begin(); x != copy.end(); ++x) {
-               double foo = (*x)->value;
-               line.view_to_model_y (foo);
-               (*x)->value = foo;
+               double when = (*x)->when;
+               double val  = (*x)->value;
+               line.view_to_model_coord (when, val);
+               (*x)->when = when;
+               (*x)->value = val;
        }
 
        XMLNode &before = alist->get_state();
@@ -756,14 +778,14 @@ AutomationTimeAxisView::get_selectables (nframes_t start, nframes_t end, double
                double botfrac;
 
                /* remember: this is X Window - coordinate space starts in upper left and moves down.
-                  y_position is the "origin" or "top" of the track.
+                  _y_position is the "origin" or "top" of the track.
                */
 
-               double mybot = y_position + height;
+               double mybot = _y_position + height;
 
-               if (y_position >= top && mybot <= bot) {
+               if (_y_position >= top && mybot <= bot) {
 
-                       /* y_position is below top, mybot is above bot, so we're fully
+                       /* _y_position is below top, mybot is above bot, so we're fully
                           covered vertically.
                        */
 
@@ -772,10 +794,10 @@ AutomationTimeAxisView::get_selectables (nframes_t start, nframes_t end, double
 
                } else {
 
-                       /* top and bot are within y_position .. mybot */
+                       /* top and bot are within _y_position .. mybot */
 
-                       topfrac = 1.0 - ((top - y_position) / height);
-                       botfrac = 1.0 - ((bot - y_position) / height);
+                       topfrac = 1.0 - ((top - _y_position) / height);
+                       botfrac = 1.0 - ((bot - _y_position) / height);
                }
 
                if (_line)
@@ -839,19 +861,8 @@ AutomationTimeAxisView::exited ()
                _line->track_exited();
 }
 
-/*void
-AutomationTimeAxisView::set_colors ()
-{
-    for (list<GhostRegion*>::iterator i=ghosts.begin(); i != ghosts.end(); i++ ) {
-               (*i)->set_colors();
-    }
-    
-       if (_line)
-               _line->set_colors();
-               }*/
-
 void
-AutomationTimeAxisView::color_handler () 
+AutomationTimeAxisView::color_handler ()
 {
        if (_line) {
                _line->set_colors();
@@ -859,34 +870,22 @@ AutomationTimeAxisView::color_handler ()
 }
 
 int
-AutomationTimeAxisView::set_state (const XMLNode& node)
+AutomationTimeAxisView::set_state (const XMLNode& node, int version)
 {
-       TimeAxisView::set_state (node);
-       
-       XMLNodeList kids;
-       XMLNodeConstIterator iter;
+       TimeAxisView::set_state (node, version);
 
-       kids = node.children ();
-
-       for (iter = kids.begin(); iter != kids.end(); ++iter) {
-               
-               if ((*iter)->name() == state_node_name) {
-                       XMLProperty* type = (*iter)->property("automation-id");
-
-                       if (type && type->value() == ARDOUR::EventTypeMap::instance().to_symbol(_control->parameter())) {
-                               XMLProperty *shown = (*iter)->property("shown-editor");
-
-                               if (shown && shown->value() == "yes") {
-                                       set_marked_for_display(true);
-                                       canvas_display->show(); /* FIXME: necessary? show_at? */
-                               }
-                               break;
-                       }
+       XMLProperty const * type = node.property ("automation-id");
+       if (type && type->value () == ARDOUR::EventTypeMap::instance().to_symbol (_control->parameter())) {
+               XMLProperty const * shown = node.property ("shown");
+               if (shown && shown->value () == "yes") {
+                       set_marked_for_display (true);
+                       _canvas_display->show (); /* FIXME: necessary? show_at? */
                }
        }
 
-       if (!_marked_for_display)
+       if (!_marked_for_display) {
                hide();
+       }
 
        return 0;
 }
@@ -916,7 +915,7 @@ guint32
 AutomationTimeAxisView::show_at (double y, int& nth, Gtk::VBox *parent)
 {
        update_extra_xml_shown (true);
-       
+
        return TimeAxisView::show_at (y, nth, parent);
 }