livetrax/gtk2_ardour/automation_time_axis.cc

/*
    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 "pbd/memento_command.h"
#include "ardour/automation_control.h"
#include "ardour/event_type_map.h"
#include "ardour/route.h"

#include "ardour_ui.h"
#include "automation_time_axis.h"
#include "automation_streamview.h"
#include "route_time_axis.h"
#include "automation_line.h"
#include "public_editor.h"
#include "simplerect.h"
#include "selection.h"
#include "rgb_macros.h"
#include "automation_selectable.h"
#include "point_selection.h"
#include "canvas_impl.h"
#include "utils.h"

#include "i18n.h"

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

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.
 * For region automation (e.g. MIDI CC), pass null for \a.
 */
AutomationTimeAxisView::AutomationTimeAxisView (Session& s, boost::shared_ptr<Route> r,
		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), 
	  TimeAxisView (s, e, &parent, canvas),
	  _route (r),
	  _control (c),
	  _automatable (a),
	  _controller(AutomationController::create(a, c->parameter(), c)),
	  _base_rect (0),
	  _view (show_regions ? new AutomationStreamView(*this) : NULL),
	  _name (nom),
	  auto_button (X_("")) /* force addition of a label */
{
	if (!have_name_font) {
		name_font = get_font_for_style (X_("AutomationTrackName"));
		have_name_font = true;
	}

	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;
	
	_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->lower_to_bottom();

	hide_button.add (*(manage (new Gtk::Image (::get_icon("hide")))));

	auto_button.set_name ("TrackVisualButton");
	hide_button.set_name ("TrackRemoveButton");

	auto_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(hide_button, _("hide track"));

	/* rearrange the name display */

	/* we never show these for automation tracks, so make
	   life easier and remove them.
	*/

	hide_name_entry();

	/* move the name label over a bit */

	string shortpname = _name;
	bool shortened = false;

	int ignore_width;
	shortpname = fit_to_pixels (_name, 60, *name_font, ignore_width, true);

	if (shortpname != _name ){
		shortened = true;
	}

	name_label.set_text (shortpname);
	name_label.set_alignment (Gtk::ALIGN_CENTER, Gtk::ALIGN_CENTER);

	if (nomparent.length()) {

		/* limit the plug name string */

		string pname = fit_to_pixels (nomparent, 60, *name_font, ignore_width, true);
		if (pname != nomparent) {
			shortened = true;
		}

 		plugname = new Label (pname);
		plugname->set_name (X_("TrackPlugName"));
		plugname->show();
		name_label.set_name (X_("TrackParameterName"));
		controls_table.remove (name_hbox);
		controls_table.attach (*plugname, 1, 5, 0, 1, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND);
		plugname_packed = true;
		controls_table.attach (name_hbox, 1, 5, 1, 2, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND);
	} else {
		plugname = 0;
		plugname_packed = false;
	}

	if (shortened) {
		string tipname = nomparent;
		if (!tipname.empty()) {
			tipname += ": ";
		}
		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);
	
	/* add bar controller */
	controls_table.attach (*_controller.get(), 0, 8, 1, 2, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND);

	controls_table.show_all ();

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

	XMLNode* xml_node = get_parent_with_state()->get_automation_child_xml_node (
			_control->parameter());

	if (xml_node) {
		set_state (*xml_node);
	} 
		
	/* 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,
					_control->alist()));

		line->set_line_color (ARDOUR_UI::config()->canvasvar_ProcessorAutomationLine.get());
		line->queue_reset ();
		add_line (line);
	}

	/* make sure labels etc. are correct */

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

AutomationTimeAxisView::~AutomationTimeAxisView ()
{
}

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 (_("Manual"), bind (mem_fun(*this,
				&AutomationTimeAxisView::set_automation_state), (AutoState) Off)));
		items.push_back (MenuElem (_("Play"), bind (mem_fun(*this,
				&AutomationTimeAxisView::set_automation_state), (AutoState) Play)));
		items.push_back (MenuElem (_("Write"), bind (mem_fun(*this,
				&AutomationTimeAxisView::set_automation_state), (AutoState) Write)));
		items.push_back (MenuElem (_("Touch"), bind (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) {
		_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) {
		_view->set_automation_state (state);
	}
}

void
AutomationTimeAxisView::automation_state_changed ()
{
	AutoState state;

	/* update button label */

	if (!_line) {
		state = Off;
	} else {
		state = _control->alist()->automation_state ();
	}
	
	switch (state & (Off|Play|Touch|Write)) {
	case Off:
		auto_button.set_label (_("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_label (_("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_label (_("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_label (_("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_label (_("???"));
		break;
	}
}

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);
			mode_line_item->set_active(false);
		} else {
			mode_line_item->set_active(true);
			mode_discrete_item->set_active(false);
		}
	}
	
	if (_line) {
		_line->set_interpolation(style);
	}
}

void
AutomationTimeAxisView::set_interpolation (AutomationList::InterpolationStyle style)
{
	_control->list()->set_interpolation(style);
	if (_line) {
		_line->set_interpolation(style);
	}
}

void
AutomationTimeAxisView::clear_clicked ()
{
	_session.begin_reversible_command (_("clear automation"));
	if (_line) {
		_line->clear ();
	}
	_session.commit_reversible_command ();
}

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) );

	TimeAxisView* state_parent = get_parent_with_state ();
	assert(state_parent);
	XMLNode* xml_node = state_parent->get_automation_child_xml_node (_control->parameter());

	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();
	}

	char buf[32];
	snprintf (buf, sizeof (buf), "%u", height);
	if (xml_node) {
		xml_node->add_property ("height", buf);
	}

	if (changed_between_small_and_normal || first_call_to_set_height) {

		first_call_to_set_height = false;

		if (h >= hNormal) {
			controls_table.remove (name_hbox);
			
			if (plugname) {
				if (plugname_packed) {
					controls_table.remove (*plugname);
					plugname_packed = false;
				}
				controls_table.attach (*plugname, 1, 5, 0, 1, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND);
				plugname_packed = true;
				controls_table.attach (name_hbox, 1, 5, 1, 2, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND);
			} else {
				controls_table.attach (name_hbox, 1, 5, 0, 1, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND);
			}
			hide_name_entry ();
			show_name_label ();
			name_hbox.show_all ();
			
			auto_button.show();
			hide_button.show_all();

		} else if (h >= hSmall) {
			controls_table.remove (name_hbox);
			if (plugname) {
				if (plugname_packed) {
					controls_table.remove (*plugname);
					plugname_packed = false;
				}
			}
			controls_table.attach (name_hbox, 1, 5, 0, 1, Gtk::FILL|Gtk::EXPAND, Gtk::FILL|Gtk::EXPAND);
			controls_table.hide_all ();
			hide_name_entry ();
			show_name_label ();
			name_hbox.show_all ();
			
			auto_button.hide();
			hide_button.hide();
		}
	} else if (h >= hNormal){
		cerr << "track grown, but neither changed_between_small_and_normal nor first_call_to_set_height set!" << endl;
	}

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

void
AutomationTimeAxisView::set_samples_per_unit (double spu)
{
	TimeAxisView::set_samples_per_unit (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);
}

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

	/* get the size menu ready */

	build_size_menu ();

	/* prepare it */

	TimeAxisView::build_display_menu ();

	/* now fill it with our stuff */

	MenuList& items = display_menu->items();

	items.push_back (MenuElem (_("Height"), *size_menu));
	items.push_back (SeparatorElem());
	items.push_back (MenuElem (_("Hide"), mem_fun(*this, &AutomationTimeAxisView::hide_clicked)));
	items.push_back (SeparatorElem());
	items.push_back (MenuElem (_("Clear"), 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 (_("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)));
	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)));
	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)));
	auto_touch_item = dynamic_cast<CheckMenuItem*>(&as_items.back());

	items.push_back (MenuElem (_("State"), *auto_state_menu));
	
	/* mode menu */

	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)));
		mode_discrete_item = dynamic_cast<CheckMenuItem*>(&am_items.back());
		mode_discrete_item->set_active(_control->list()->interpolation() == AutomationList::Discrete);

		// For discrete types we dont allow the linear option since it makes no sense for those Controls
		if (EventTypeMap::instance().interpolation_of(_control->parameter()) == Evoral::ControlList::Linear) {
			am_items.push_back (RadioMenuElem (group, _("Line"), 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);
		}

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

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

	automation_state_changed ();
	interpolation_changed ();
}

void
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);

	/* compute vertical fractional position */

	y = 1.0 - (y / height);

	/* map using line */

	_line->view_to_model_coord (x, y);

	_session.begin_reversible_command (_("add automation event"));
	XMLNode& before = _control->alist()->get_state();

	_control->alist()->add (when, y);

	XMLNode& after = _control->alist()->get_state();
	_session.commit_reversible_command (new MementoCommand<ARDOUR::AutomationList>(*_control->alist(), &before, &after));

	_session.set_dirty ();
}


bool
AutomationTimeAxisView::cut_copy_clear (Selection& selection, CutCopyOp op)
{
	return (_line ? cut_copy_clear_one (*_line, selection, op) : false);
}

bool
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());
	bool ret = false;

	XMLNode &before = alist->get_state();

	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);
			_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);
		}
		break;

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

	return ret;
}

void
AutomationTimeAxisView::reset_objects (PointSelection& selection)
{
	reset_objects_one (*_line, selection);
}

void
AutomationTimeAxisView::reset_objects_one (AutomationLine& line, PointSelection& selection)
{
	boost::shared_ptr<AutomationList> alist(line.the_list());

	_session.add_command (new MementoCommand<AutomationList>(*alist.get(), &alist->get_state(), 0));

	for (PointSelection::iterator i = selection.begin(); i != selection.end(); ++i) {

		if (&(*i).track != this) {
			continue;
		}
		
		alist->reset_range ((*i).start, (*i).end);
	}
}

bool
AutomationTimeAxisView::cut_copy_clear_objects (PointSelection& selection, CutCopyOp op)
{
	return cut_copy_clear_objects_one (*_line, selection, op);
}

bool
AutomationTimeAxisView::cut_copy_clear_objects_one (AutomationLine& line, PointSelection& selection, CutCopyOp op)
{
	boost::shared_ptr<Evoral::ControlList> what_we_got;
	boost::shared_ptr<AutomationList> alist(line.the_list());
	bool ret = false;

	XMLNode &before = alist->get_state();

	for (PointSelection::iterator i = selection.begin(); i != selection.end(); ++i) {

		if (&(*i).track != this) {
			continue;
		}

		switch (op) {
		case Cut:
			if ((what_we_got = alist->cut ((*i).start, (*i).end)) != 0) {
				_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);
			}
			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()));
				ret = true;
			}
			break;
		}
	}

	delete &before;

	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;
		}
	}

	return ret;
}

bool
AutomationTimeAxisView::paste (nframes_t pos, float times, Selection& selection, size_t nth)
{
	return paste_one (*_line, pos, times, selection, nth);
}

bool
AutomationTimeAxisView::paste_one (AutomationLine& line, nframes_t pos, float times, Selection& selection, size_t nth)
{
	AutomationSelection::iterator p;
	boost::shared_ptr<AutomationList> alist(line.the_list());
	
	for (p = selection.lines.begin(); p != selection.lines.end() && nth; ++p, --nth) {}

	if (p == selection.lines.end()) {
		return false;
	}

	/* Make a copy of the list because we have to scale the
	   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 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();
	alist->paste (copy, pos, times);
	_session.add_command (new MementoCommand<AutomationList>(*alist.get(), &before, &alist->get_state()));

	return true;
}

void
AutomationTimeAxisView::get_selectables (nframes_t start, nframes_t end, double top, double bot, list<Selectable*>& results)
{
	if (_line && touched (top, bot)) {
		double topfrac;
		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.
		*/

		double mybot = _y_position + height;

		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);
	}
}

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);
}

void
AutomationTimeAxisView::clear_lines ()
{
	_line.reset();
	automation_connection.disconnect ();
}

void
AutomationTimeAxisView::add_line (boost::shared_ptr<AutomationLine> line)
{
	assert(line);
	assert(!_line);
	assert(line->the_list() == _control->list());

	automation_connection = _control->alist()->automation_state_changed.connect
		(mem_fun(*this, &AutomationTimeAxisView::automation_state_changed));

	_line = line;
	//_controller = AutomationController::create(_session, line->the_list(), _control);

	line->set_height (height);

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

	line->show();
}

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 (const XMLNode& node)
{
	TimeAxisView::set_state (node);

	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) {
		hide();
	}

	return 0;
}

XMLNode*
AutomationTimeAxisView::get_state_node ()
{
	TimeAxisView* state_parent = get_parent_with_state ();

	if (state_parent) {
		return state_parent->get_automation_child_xml_node (_control->parameter());
	} else {
		return 0;
	}
}

void
AutomationTimeAxisView::update_extra_xml_shown (bool editor_shown)
{
	XMLNode* xml_node = get_state_node();
	if (xml_node) {
		xml_node->add_property ("shown", editor_shown ? "yes" : "no");
	}
}

guint32
AutomationTimeAxisView::show_at (double y, int& nth, Gtk::VBox *parent)
{
	update_extra_xml_shown (true);
	
	return TimeAxisView::show_at (y, nth, parent);
}

void
AutomationTimeAxisView::hide ()
{
	update_extra_xml_shown (false);

	TimeAxisView::hide ();
}