automation_time_axis.cc

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/*
    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
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <utility>
#include <gtkmm2ext/barcontroller.h>
#include <gtkmm2ext/utils.h>
#include <boost/algorithm/string.hpp>
#include <boost/lexical_cast.hpp>

#include "pbd/error.h"
#include "pbd/memento_command.h"
#include "pbd/stacktrace.h"

#include "ardour/automation_control.h"
#include "ardour/event_type_map.h"
#include "ardour/parameter_types.h"
#include "ardour/profile.h"
#include "ardour/route.h"
#include "ardour/session.h"

#include "canvas/debug.h"

#include "ardour_ui.h"
#include "automation_time_axis.h"
#include "automation_streamview.h"
#include "global_signals.h"
#include "gui_thread.h"
#include "route_time_axis.h"
#include "automation_line.h"
#include "paste_context.h"
#include "public_editor.h"
#include "selection.h"
#include "rgb_macros.h"
#include "point_selection.h"
#include "control_point.h"
#include "utils.h"
#include "item_counts.h"

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace ARDOUR_UI_UTILS;
using namespace PBD;
using namespace Gtk;
using namespace Gtkmm2ext;
using namespace Editing;

Pango::FontDescription AutomationTimeAxisView::name_font;
bool AutomationTimeAxisView::have_name_font = false;


AutomationTimeAxisView::AutomationTimeAxisView (
        Session* s,
        boost::shared_ptr<Route> r,
        boost::shared_ptr<Automatable> a,
        boost::shared_ptr<AutomationControl> c,
        Evoral::Parameter p,
        PublicEditor& e,
        TimeAxisView& parent,
        bool show_regions,
        ArdourCanvas::Canvas& canvas,
        const string & nom,
        const string & nomparent
        )
        : AxisView (s)
        , TimeAxisView (s, e, &parent, canvas)
        , _route (r)
        , _control (c)
        , _automatable (a)
        , _parameter (p)
        , _base_rect (new ArdourCanvas::Rectangle (_canvas_display))
        , _view (show_regions ? new AutomationStreamView (*this) : 0)
        , auto_button (X_("")) /* force addition of a label */
        , _show_regions (show_regions)
{
        //concatenate plugin name and param name into the tooltip
        string tipname = nomparent;
        if (!tipname.empty()) {
                tipname += ": ";
        }
        tipname += nom;
        ARDOUR_UI::instance()->set_tip(controls_ebox, tipname);

        //plugin name and param name appear on 2 separate lines in the track header
        tipname = nomparent;
        if (!tipname.empty()) {
                tipname += "\n";
        }
        tipname += nom;
        _name = tipname;
        
        CANVAS_DEBUG_NAME (_canvas_display, string_compose ("main for auto %2/%1", _name, r->name()));
        CANVAS_DEBUG_NAME (selection_group, string_compose ("selections for auto %2/%1", _name, r->name()));
        CANVAS_DEBUG_NAME (_ghost_group, string_compose ("ghosts for auto %2/%1", _name, r->name()));

        if (!have_name_font) {
                name_font = get_font_for_style (X_("AutomationTrackName"));
                have_name_font = true;
        }

        if (_automatable && _control) {
                _controller = AutomationController::create (_automatable, _control->parameter(), _control->desc(), _control);
        }

        const std::string fill_color_name = (dynamic_cast<MidiTimeAxisView*>(&parent)
                                             ? "midi automation track fill"
                                             : "audio automation track fill");

        automation_menu = 0;
        auto_off_item = 0;
        auto_touch_item = 0;
        auto_write_item = 0;
        auto_play_item = 0;
        mode_discrete_item = 0;
        mode_line_item = 0;

        ignore_state_request = false;
        first_call_to_set_height = true;

        CANVAS_DEBUG_NAME (_base_rect, string_compose ("base rect for %1", _name));
        _base_rect->set_x1 (ArdourCanvas::COORD_MAX);
        _base_rect->set_outline (false);
        _base_rect->set_fill_color (ARDOUR_UI::config()->color_mod (fill_color_name, "automation track fill"));
        _base_rect->set_data ("trackview", this);
        _base_rect->Event.connect (sigc::bind (sigc::mem_fun (_editor, &PublicEditor::canvas_automation_track_event), _base_rect, this));
        if (!a) {
                _base_rect->lower_to_bottom();
        }

        hide_button.set_elements ((ArdourButton::Element)(ArdourButton::Edge|ArdourButton::Body|ArdourButton::VectorIcon));
        hide_button.set_icon (ArdourButton::CloseCross);
        hide_button.set_tweaks(ArdourButton::TrackHeader);

        auto_button.set_name ("route button");
        hide_button.set_name ("route button");

        auto_button.unset_flags (Gtk::CAN_FOCUS);
        hide_button.unset_flags (Gtk::CAN_FOCUS);

        controls_table.set_no_show_all();

        ARDOUR_UI::instance()->set_tip(auto_button, _("automation state"));
        ARDOUR_UI::instance()->set_tip(hide_button, _("hide track"));

        const string str = gui_property ("height");
        if (!str.empty()) {
                set_height (atoi (str));
        } else {
                set_height (preset_height (HeightNormal));
        }

        //name label isn't editable on an automation track; remove the tooltip
        ARDOUR_UI::instance()->set_tip (name_label, X_(""));

        /* repack the name label */

        if (name_label.get_parent()) {
                name_label.get_parent()->remove (name_label);
        }
        
        name_label.set_text (_name);
        name_label.set_alignment (Gtk::ALIGN_LEFT, Gtk::ALIGN_CENTER);
        name_label.set_name (X_("TrackParameterName"));
        name_label.set_ellipsize (Pango::ELLIPSIZE_END);

        /* add the buttons */
        controls_table.set_border_width (1);
        controls_table.remove (name_hbox);
        controls_table.attach (hide_button, 1, 2, 0, 1, Gtk::SHRINK, Gtk::SHRINK, 0, 0);
        controls_table.attach (name_label,  2, 3, 1, 3, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND, 2, 0);
        controls_table.attach (auto_button, 3, 4, 2, 3, Gtk::SHRINK, Gtk::SHRINK, 0, 0);

        Gtk::DrawingArea *blank0 = manage (new Gtk::DrawingArea());
        Gtk::DrawingArea *blank1 = manage (new Gtk::DrawingArea());

        RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*>(&parent);
        // TODO use rtv->controls_base_unselected_name
        // subscribe to route_active_changed, ...
        if (rtv && rtv->is_audio_track()) {
                blank0->set_name ("AudioTrackControlsBaseUnselected");
        }
        else if (rtv && rtv->is_midi_track()) {
                blank0->set_name ("MidiTrackControlsBaseUnselected");
        }
        else {
                blank0->set_name ("AudioBusControlsBaseUnselected");
        }
        blank0->set_size_request (-1, -1);
        blank1->set_size_request (1, 0);
        VSeparator* separator = manage (new VSeparator());
        separator->set_name("TrackSeparator");
        separator->set_size_request (1, -1);

        controls_button_size_group->add_widget(hide_button);
        controls_button_size_group->add_widget(*blank0);

        time_axis_hbox.pack_start (*blank0, false, false);
        time_axis_hbox.pack_start (*separator, false, false);
        time_axis_hbox.reorder_child (*blank0, 0);
        time_axis_hbox.reorder_child (*separator, 1);
        time_axis_hbox.reorder_child (time_axis_vbox, 2);

        if (!ARDOUR::Profile->get_mixbus() ) {
                time_axis_hbox.pack_start (*blank1, false, false);
        }

        blank0->show();
        separator->show();
        name_label.show ();
        hide_button.show ();

        if (_controller) {
                _controller->disable_vertical_scroll ();
                controls_table.attach (*_controller.get(), 2, 4, 0, 1, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND, 0, 0);
        }

        controls_table.show_all ();

        hide_button.signal_clicked.connect (sigc::mem_fun(*this, &AutomationTimeAxisView::hide_clicked));
        auto_button.signal_clicked.connect (sigc::mem_fun(*this, &AutomationTimeAxisView::auto_clicked));

        controls_base_selected_name = X_("AutomationTrackControlsBaseSelected");
        controls_base_unselected_name = X_("AutomationTrackControlsBase");

        controls_ebox.set_name (controls_base_unselected_name);
        time_axis_frame.set_name (controls_base_unselected_name);

        /* ask for notifications of any new RegionViews */
        if (show_regions) {

                if (_view) {
                        _view->attach ();
                }

        } else {
                /* no regions, just a single line for the entire track (e.g. bus gain) */

                assert (_control);

                boost::shared_ptr<AutomationLine> line (
                        new AutomationLine (
                                ARDOUR::EventTypeMap::instance().to_symbol(_parameter),
                                *this,
                                *_canvas_display,
                                _control->alist(),
                                _control->desc()
                                )
                        );

                line->set_line_color (ARDOUR_UI::config()->color ("processor automation line"));
                line->queue_reset ();
                add_line (line);
        }

        /* make sure labels etc. are correct */

        automation_state_changed ();
        ColorsChanged.connect (sigc::mem_fun (*this, &AutomationTimeAxisView::color_handler));

        _route->DropReferences.connect (
                _route_connections, invalidator (*this), boost::bind (&AutomationTimeAxisView::route_going_away, this), gui_context ()
                );
}

AutomationTimeAxisView::~AutomationTimeAxisView ()
{
        cleanup_gui_properties ();
        delete _view;
}

void
AutomationTimeAxisView::route_going_away ()
{
        _route.reset ();
}

void
AutomationTimeAxisView::auto_clicked ()
{
        using namespace Menu_Helpers;

        if (automation_menu == 0) {
                automation_menu = manage (new Menu);
                automation_menu->set_name ("ArdourContextMenu");
                MenuList& items (automation_menu->items());

                items.push_back (MenuElem (S_("Automation|Manual"), sigc::bind (sigc::mem_fun(*this,
                                                                                              &AutomationTimeAxisView::set_automation_state), (AutoState) ARDOUR::Off)));
                items.push_back (MenuElem (_("Play"), sigc::bind (sigc::mem_fun(*this,
                                &AutomationTimeAxisView::set_automation_state), (AutoState) Play)));
                items.push_back (MenuElem (_("Write"), sigc::bind (sigc::mem_fun(*this,
                                &AutomationTimeAxisView::set_automation_state), (AutoState) Write)));
                items.push_back (MenuElem (_("Touch"), sigc::bind (sigc::mem_fun(*this,
                                &AutomationTimeAxisView::set_automation_state), (AutoState) Touch)));
        }

        automation_menu->popup (1, gtk_get_current_event_time());
}

void
AutomationTimeAxisView::set_automation_state (AutoState state)
{
        if (ignore_state_request) {
                return;
        }

        if (_automatable) {
                _automatable->set_parameter_automation_state (_parameter, state);
        }

        if (_view) {
                _view->set_automation_state (state);

                /* AutomationStreamViews don't signal when their automation state changes, so handle
                   our updates `manually'.
                */
                automation_state_changed ();
        }
}

void
AutomationTimeAxisView::automation_state_changed ()
{
        AutoState state;

        /* update button label */

        if (_view) {
                state = _view->automation_state ();
        } else if (_line) {
                assert (_control);
                state = _control->alist()->automation_state ();
        } else {
                state = ARDOUR::Off;
        }

        switch (state & (ARDOUR::Off|Play|Touch|Write)) {
        case ARDOUR::Off:
                auto_button.set_text (S_("Automation|Manual"));
                if (auto_off_item) {
                        ignore_state_request = true;
                        auto_off_item->set_active (true);
                        auto_play_item->set_active (false);
                        auto_touch_item->set_active (false);
                        auto_write_item->set_active (false);
                        ignore_state_request = false;
                }
                break;
        case Play:
                auto_button.set_text (_("Play"));
                if (auto_play_item) {
                        ignore_state_request = true;
                        auto_play_item->set_active (true);
                        auto_off_item->set_active (false);
                        auto_touch_item->set_active (false);
                        auto_write_item->set_active (false);
                        ignore_state_request = false;
                }
                break;
        case Write:
                auto_button.set_text (_("Write"));
                if (auto_write_item) {
                        ignore_state_request = true;
                        auto_write_item->set_active (true);
                        auto_off_item->set_active (false);
                        auto_play_item->set_active (false);
                        auto_touch_item->set_active (false);
                        ignore_state_request = false;
                }
                break;
        case Touch:
                auto_button.set_text (_("Touch"));
                if (auto_touch_item) {
                        ignore_state_request = true;
                        auto_touch_item->set_active (true);
                        auto_off_item->set_active (false);
                        auto_play_item->set_active (false);
                        auto_write_item->set_active (false);
                        ignore_state_request = false;
                }
                break;
        default:
                auto_button.set_text (_("???"));
                break;
        }
}

void
AutomationTimeAxisView::interpolation_changed (AutomationList::InterpolationStyle s)
{
        if (mode_line_item && mode_discrete_item) {
                if (s == AutomationList::Discrete) {
                        mode_discrete_item->set_active(true);
                        mode_line_item->set_active(false);
                } else {
                        mode_line_item->set_active(true);
                        mode_discrete_item->set_active(false);
                }
        }
}

void
AutomationTimeAxisView::set_interpolation (AutomationList::InterpolationStyle style)
{
        /* Tell our view's list, if we have one, otherwise tell our own.
         * Everything else will be signalled back from that.
         */

        if (_view) {
                _view->set_interpolation (style);
        } else {
                assert (_control);
                _control->list()->set_interpolation (style);
        }
}

void
AutomationTimeAxisView::clear_clicked ()
{
        assert (_line || _view);

        _editor.begin_reversible_command (_("clear automation"));

        if (_line) {
                _line->clear ();
        } else if (_view) {
                _view->clear ();
        }

        _editor.commit_reversible_command ();
        _session->set_dirty ();
}

void
AutomationTimeAxisView::set_height (uint32_t h, TrackHeightMode m)
{
        bool const changed = (height != (uint32_t) h) || first_call_to_set_height;
        uint32_t const normal = preset_height (HeightNormal);
        bool const changed_between_small_and_normal = ( (height < normal && h >= normal) || (height >= normal || h < normal) );

        TimeAxisView::set_height (h, m);

        _base_rect->set_y1 (h);

        if (_line) {
                _line->set_height(h - 2.5);
        }

        if (_view) {
                _view->set_height(h);
                _view->update_contents_height();
        }

        if (changed_between_small_and_normal || first_call_to_set_height) {

                first_call_to_set_height = false;

                if (h >= preset_height (HeightNormal)) {
                        if (!(_parameter.type() >= MidiCCAutomation &&
                              _parameter.type() <= MidiChannelPressureAutomation)) {
                                auto_button.show();
                        }
                        name_label.show();
                        hide_button.show();

                } else if (h >= preset_height (HeightSmall)) {
                        controls_table.hide_all ();
                        auto_button.hide();
                        name_label.hide();
                }
        }

        if (changed) {
                if (_canvas_display->visible() && _route) {
                        /* only emit the signal if the height really changed and we were visible */
                        _route->gui_changed ("visible_tracks", (void *) 0); /* EMIT_SIGNAL */
                }
        }
}

void
AutomationTimeAxisView::set_samples_per_pixel (double fpp)
{
        TimeAxisView::set_samples_per_pixel (fpp);

        if (_line) {
                _line->reset ();
        }

        if (_view) {
                _view->set_samples_per_pixel (fpp);
        }
}

void
AutomationTimeAxisView::hide_clicked ()
{
        hide_button.set_sensitive(false);
        set_marked_for_display (false);
        RouteTimeAxisView* rtv = dynamic_cast<RouteTimeAxisView*>(parent);
        if (rtv) {
                rtv->request_redraw ();
        }
        hide_button.set_sensitive(true);
}

void
AutomationTimeAxisView::build_display_menu ()
{
        using namespace Menu_Helpers;

        /* prepare it */

        TimeAxisView::build_display_menu ();

        /* now fill it with our stuff */

        MenuList& items = display_menu->items();

        items.push_back (MenuElem (_("Hide"), sigc::mem_fun(*this, &AutomationTimeAxisView::hide_clicked)));
        items.push_back (SeparatorElem());
        items.push_back (MenuElem (_("Clear"), sigc::mem_fun(*this, &AutomationTimeAxisView::clear_clicked)));
        items.push_back (SeparatorElem());

        /* state 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 (S_("Automation|Manual"), sigc::bind (
                        sigc::mem_fun(*this, &AutomationTimeAxisView::set_automation_state),
                        (AutoState) ARDOUR::Off)));
        auto_off_item = dynamic_cast<Gtk::CheckMenuItem*>(&as_items.back());

        as_items.push_back (CheckMenuElem (_("Play"), sigc::bind (
                        sigc::mem_fun(*this, &AutomationTimeAxisView::set_automation_state),
                        (AutoState) Play)));
        auto_play_item = dynamic_cast<Gtk::CheckMenuItem*>(&as_items.back());

        as_items.push_back (CheckMenuElem (_("Write"), sigc::bind (
                        sigc::mem_fun(*this, &AutomationTimeAxisView::set_automation_state),
                        (AutoState) Write)));
        auto_write_item = dynamic_cast<Gtk::CheckMenuItem*>(&as_items.back());

        as_items.push_back (CheckMenuElem (_("Touch"), sigc::bind (
                        sigc::mem_fun(*this, &AutomationTimeAxisView::set_automation_state),
                        (AutoState) Touch)));
        auto_touch_item = dynamic_cast<Gtk::CheckMenuItem*>(&as_items.back());

        if (!(_parameter.type() >= MidiCCAutomation &&
              _parameter.type() <= MidiChannelPressureAutomation)) {
                items.push_back (MenuElem (_("State"), *auto_state_menu));
        }

        /* mode menu */

        /* current interpolation state */
        AutomationList::InterpolationStyle const s = _view ? _view->interpolation() : _control->list()->interpolation ();

        if (ARDOUR::parameter_is_midi ((AutomationType)_parameter.type())) {

                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"), sigc::bind (
                                sigc::mem_fun(*this, &AutomationTimeAxisView::set_interpolation),
                                AutomationList::Discrete)));
                mode_discrete_item = dynamic_cast<Gtk::CheckMenuItem*>(&am_items.back());
                mode_discrete_item->set_active (s == AutomationList::Discrete);

                am_items.push_back (RadioMenuElem (group, _("Linear"), sigc::bind (
                                sigc::mem_fun(*this, &AutomationTimeAxisView::set_interpolation),
                                AutomationList::Linear)));
                mode_line_item = dynamic_cast<Gtk::CheckMenuItem*>(&am_items.back());
                mode_line_item->set_active (s == AutomationList::Linear);

                items.push_back (MenuElem (_("Mode"), *auto_mode_menu));
        }

        /* make sure the automation menu state is correct */

        automation_state_changed ();
        interpolation_changed (s);
}

void
AutomationTimeAxisView::add_automation_event (GdkEvent* event, framepos_t when, double y, bool with_guard_points)
{
        if (!_line) {
                return;
        }

        boost::shared_ptr<AutomationList> list = _line->the_list ();
        
        if (list->in_write_pass()) {
                /* do not allow the GUI to add automation events during an
                   automation write pass.
                */
                return;
        }

        double x = 0;

        _canvas_display->canvas_to_item (x, y);

        /* compute vertical fractional position */

        y = 1.0 - (y / height);

        /* map using line */

        _line->view_to_model_coord (x, y);


        _editor.snap_to_with_modifier (when, event);

        _editor.begin_reversible_command (_("add automation event"));
        XMLNode& before = list->get_state();

        list->add (when, y, with_guard_points);

        XMLNode& after = list->get_state();
        _session->add_command (new MementoCommand<ARDOUR::AutomationList> (*list, &before, &after));
        _editor.commit_reversible_command ();
        _session->set_dirty ();
}

bool
AutomationTimeAxisView::paste (framepos_t pos, const Selection& selection, PasteContext& ctx)
{
        if (_line) {
                return paste_one (pos, ctx.count, ctx.times, selection, ctx.counts, ctx.greedy);
        } else if (_view) {
                AutomationSelection::const_iterator l = selection.lines.get_nth(_parameter, ctx.counts.n_lines(_parameter));
                if (l == selection.lines.end()) {
                        if (ctx.greedy && selection.lines.size() == 1) {
                                l = selection.lines.begin();
                        }
                }
                if (l != selection.lines.end() && _view->paste (pos, ctx.count, ctx.times, *l)) {
                        ctx.counts.increase_n_lines(_parameter);
                        return true;
                }
        }

        return false;
}

bool
AutomationTimeAxisView::paste_one (framepos_t pos, unsigned paste_count, float times, const Selection& selection, ItemCounts& counts, bool greedy)
{
        boost::shared_ptr<AutomationList> alist(_line->the_list());

        if (_session->transport_rolling() && alist->automation_write()) {
                /* do not paste if this control is in write mode and we're rolling */
                return false;
        }

        /* Get appropriate list from selection. */
        AutomationSelection::const_iterator p = selection.lines.get_nth(_parameter, counts.n_lines(_parameter));
        if (p == selection.lines.end()) {
                if (greedy && selection.lines.size() == 1) {
                        p = selection.lines.begin();
                } else {
                        return false;
                }
        }
        counts.increase_n_lines(_parameter);

        /* add multi-paste offset if applicable */
        pos += _editor.get_paste_offset(pos, paste_count, (*p)->length());

        double const model_pos = _line->time_converter().from (pos - _line->time_converter().origin_b ());

        XMLNode &before = alist->get_state();
        alist->paste (**p, model_pos, times);
        _session->add_command (new MementoCommand<AutomationList>(*alist.get(), &before, &alist->get_state()));

        return true;
}

void
AutomationTimeAxisView::get_selectables (framepos_t start, framepos_t end, double top, double bot, list<Selectable*>& results, bool /*within*/)
{
        if (!_line && !_view) {
                return;
        }

        if (touched (top, bot)) {

                /* remember: this is X Window - coordinate space starts in upper left and moves down.
                   _y_position is the "origin" or "top" of the track.
                */

                /* bottom of our track */
                double const mybot = _y_position + height;

                double topfrac;
                double botfrac;

                if (_y_position >= top && mybot <= bot) {

                        /* _y_position is below top, mybot is above bot, so we're fully
                           covered vertically.
                        */

                        topfrac = 1.0;
                        botfrac = 0.0;

                } else {

                        /* top and bot are within _y_position .. mybot */

                        topfrac = 1.0 - ((top - _y_position) / height);
                        botfrac = 1.0 - ((bot - _y_position) / height);

                }

                if (_line) {
                        _line->get_selectables (start, end, botfrac, topfrac, results);
                } else if (_view) {
                        _view->get_selectables (start, end, botfrac, topfrac, results);
                }
        }
}

void
AutomationTimeAxisView::get_inverted_selectables (Selection& sel, list<Selectable*>& result)
{
        if (_line) {
                _line->get_inverted_selectables (sel, result);
        }
}

void
AutomationTimeAxisView::set_selected_points (PointSelection& points)
{
        if (_line) {
                _line->set_selected_points (points);
        } else if (_view) {
                _view->set_selected_points (points);
        }
}

void
AutomationTimeAxisView::clear_lines ()
{
        _line.reset();
        _list_connections.drop_connections ();
}

void
AutomationTimeAxisView::add_line (boost::shared_ptr<AutomationLine> line)
{
        if (_control && line) {
                assert(line->the_list() == _control->list());
                
                _control->alist()->automation_state_changed.connect (
                        _list_connections, invalidator (*this), boost::bind (&AutomationTimeAxisView::automation_state_changed, this), gui_context()
                        );
                
                _control->alist()->InterpolationChanged.connect (
                        _list_connections, invalidator (*this), boost::bind (&AutomationTimeAxisView::interpolation_changed, this, _1), gui_context()
                        );
        }

        _line = line;

        line->set_height (height);

        /* pick up the current state */
        automation_state_changed ();

        line->add_visibility (AutomationLine::Line);
}

void
AutomationTimeAxisView::entered()
{
        if (_line) {
                _line->track_entered();
        }
}

void
AutomationTimeAxisView::exited ()
{
        if (_line) {
                _line->track_exited();
        }
}

void
AutomationTimeAxisView::color_handler ()
{
        if (_line) {
                _line->set_colors();
        }
}

int
AutomationTimeAxisView::set_state_2X (const XMLNode& node, int /*version*/)
{
        if (node.name() == X_("gain") && _parameter == Evoral::Parameter (GainAutomation)) {
                XMLProperty const * shown = node.property (X_("shown"));
                if (shown) {
                        bool yn = string_is_affirmative (shown->value ());
                        if (yn) {
                                _canvas_display->show (); /* FIXME: necessary? show_at? */
                        }
                        set_gui_property ("visible", yn);
                } else {
                        set_gui_property ("visible", false);
                }
        }

        return 0;
}

int
AutomationTimeAxisView::set_state (const XMLNode&, int /*version*/)
{
        return 0;
}

void
AutomationTimeAxisView::what_has_visible_automation (const boost::shared_ptr<Automatable>& automatable, set<Evoral::Parameter>& visible)
{
        /* this keeps "knowledge" of how we store visibility information
           in XML private to this class.
        */

        assert (automatable);

        Automatable::Controls& controls (automatable->controls());
        
        for (Automatable::Controls::iterator i = controls.begin(); i != controls.end(); ++i) {
                
                boost::shared_ptr<AutomationControl> ac = boost::dynamic_pointer_cast<AutomationControl> (i->second);

                if (ac && ac->alist()) {
                        
                        const XMLNode* gui_node = ac->extra_xml ("GUI");
                        
                        if (gui_node) {
                                const XMLProperty* prop = gui_node->property ("shown");
                                if (prop) {
                                        if (string_is_affirmative (prop->value())) {
                                                visible.insert (i->first);
                                        }
                                }
                        }
                }
        }
}


bool
AutomationTimeAxisView::has_automation () const
{
        return ( (_line && _line->npoints() > 0) || (_view && _view->has_automation()) );
}

list<boost::shared_ptr<AutomationLine> >
AutomationTimeAxisView::lines () const
{
        list<boost::shared_ptr<AutomationLine> > lines;

        if (_line) {
                lines.push_back (_line);
        } else if (_view) {
                lines = _view->get_lines ();
        }

        return lines;
}

string
AutomationTimeAxisView::state_id() const
{
        if (_automatable != _route && _control) {
                return string_compose ("automation %1", _control->id().to_s());
        } else if (_parameter) {
                return string_compose ("automation %1 %2/%3/%4", 
                                       _route->id(), 
                                       _parameter.type(),
                                       _parameter.id(),
                                       (int) _parameter.channel());
        } else {
                error << "Automation time axis has no state ID" << endmsg;
                return "";
        }
}

bool
AutomationTimeAxisView::parse_state_id (
        string const & state_id,
        PBD::ID & route_id,
        bool & has_parameter,
        Evoral::Parameter & parameter)
{
        stringstream s;
        s << state_id;

        string a, b, c;
        s >> a >> b >> c;

        if (a != X_("automation")) {
                return false;
        }

        route_id = PBD::ID (b);

        if (c.empty ()) {
                has_parameter = false;
                return true;
        }

        has_parameter = true;

        vector<string> p;
        boost::split (p, c, boost::is_any_of ("/"));

        assert (p.size() == 3);

        parameter = Evoral::Parameter (
                boost::lexical_cast<int> (p[0]),
                boost::lexical_cast<int> (p[2]),
                boost::lexical_cast<int> (p[1])
                );

        return true;
}

void
AutomationTimeAxisView::cut_copy_clear (Selection& selection, CutCopyOp op)
{
        list<boost::shared_ptr<AutomationLine> > lines;
        if (_line) {
                lines.push_back (_line);
        } else if (_view) {
                lines = _view->get_lines ();
        }

        for (list<boost::shared_ptr<AutomationLine> >::iterator i = lines.begin(); i != lines.end(); ++i) {
                cut_copy_clear_one (**i, selection, op);
        }
}

void
AutomationTimeAxisView::cut_copy_clear_one (AutomationLine& line, Selection& selection, CutCopyOp op)
{
        boost::shared_ptr<Evoral::ControlList> what_we_got;
        boost::shared_ptr<AutomationList> alist (line.the_list());

        XMLNode &before = alist->get_state();

        /* convert time selection to automation list model coordinates */
        const Evoral::TimeConverter<double, ARDOUR::framepos_t>& tc = line.time_converter ();
        double const start = tc.from (selection.time.front().start - tc.origin_b ());
        double const end = tc.from (selection.time.front().end - tc.origin_b ());

        switch (op) {
        case Delete:
                if (alist->cut (start, end) != 0) {
                        _session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &alist->get_state()));
                }
                break;

        case Cut:

                if ((what_we_got = alist->cut (start, end)) != 0) {
                        _editor.get_cut_buffer().add (what_we_got);
                        _session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &alist->get_state()));
                }
                break;
        case Copy:
                if ((what_we_got = alist->copy (start, end)) != 0) {
                        _editor.get_cut_buffer().add (what_we_got);
                }
                break;

        case Clear:
                if ((what_we_got = alist->cut (start, end)) != 0) {
                        _session->add_command(new MementoCommand<AutomationList>(*alist.get(), &before, &alist->get_state()));
                }
                break;
        }

        if (what_we_got) {
                for (AutomationList::iterator x = what_we_got->begin(); x != what_we_got->end(); ++x) {
                        double when = (*x)->when;
                        double val  = (*x)->value;
                        line.model_to_view_coord (when, val);
                        (*x)->when = when;
                        (*x)->value = val;
                }
        }
}