livetrax/gtk2_ardour/midi_cue_editor.cc

/*
 * Copyright (C) 2023 Paul Davis <paul@linuxaudiosystems.com>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "ardour/midi_region.h"
#include "ardour/midi_source.h"

#include "canvas/canvas.h"
#include "canvas/container.h"
#include "canvas/debug.h"
#include "canvas/scroll_group.h"
#include "canvas/rectangle.h"

#include "gtkmm2ext/actions.h"

#include "ardour_ui.h"
#include "editor_cursors.h"
#include "editor_drag.h"
#include "keyboard.h"
#include "midi_cue_background.h"
#include "midi_cue_editor.h"
#include "midi_cue_view.h"
#include "note_base.h"
#include "ui_config.h"
#include "verbose_cursor.h"

#include "pbd/i18n.h"

using namespace ARDOUR;
using namespace ArdourCanvas;
using namespace Gtkmm2ext;
using namespace Temporal;

MidiCueEditor::MidiCueEditor()
	: vertical_adjustment (0.0, 0.0, 10.0, 400.0)
	, horizontal_adjustment (0.0, 0.0, 1e16)
	, view (nullptr)
	, mouse_mode (Editing::MouseDraw)
	, bbt_metric (*this)
	, timebar_height (15.)
	, n_timebars (1)
{
	build_canvas ();

	_verbose_cursor = new VerboseCursor (*this);

	// _playhead_cursor = new EditorCursor (*this, &Editor::canvas_playhead_cursor_event, X_("playhead"));
	_playhead_cursor = new EditorCursor (*this, X_("playhead"));
	_playhead_cursor->set_sensitive (UIConfiguration::instance().get_sensitize_playhead());

	_snapped_cursor = new EditorCursor (*this, X_("snapped"));
}

MidiCueEditor::~MidiCueEditor ()
{
}

void
MidiCueEditor::build_canvas ()
{
	_canvas_viewport = new ArdourCanvas::GtkCanvasViewport (horizontal_adjustment, vertical_adjustment);

	_canvas = _canvas_viewport->canvas ();
	_canvas->set_background_color (UIConfiguration::instance().color ("arrange base"));
	dynamic_cast<ArdourCanvas::GtkCanvas*>(_canvas)->use_nsglview (UIConfiguration::instance().get_nsgl_view_mode () == NSGLHiRes);

	/* scroll group for items that should not automatically scroll
	 *  (e.g verbose cursor). It shares the canvas coordinate space.
	*/
	no_scroll_group = new ArdourCanvas::Container (_canvas->root());

	ArdourCanvas::ScrollGroup* hsg;
	ArdourCanvas::ScrollGroup* hg;
	ArdourCanvas::ScrollGroup* cg;

	h_scroll_group = hg = new ArdourCanvas::ScrollGroup (_canvas->root(), ArdourCanvas::ScrollGroup::ScrollsHorizontally);
	CANVAS_DEBUG_NAME (h_scroll_group, "canvas h scroll");
	_canvas->add_scroller (*hg);

	hv_scroll_group = hsg = new ArdourCanvas::ScrollGroup (_canvas->root(),
							       ArdourCanvas::ScrollGroup::ScrollSensitivity (ArdourCanvas::ScrollGroup::ScrollsVertically|
													     ArdourCanvas::ScrollGroup::ScrollsHorizontally));
	CANVAS_DEBUG_NAME (hv_scroll_group, "cue canvas hv scroll");
	_canvas->add_scroller (*hsg);

	cursor_scroll_group = cg = new ArdourCanvas::ScrollGroup (_canvas->root(), ArdourCanvas::ScrollGroup::ScrollsHorizontally);
	CANVAS_DEBUG_NAME (cursor_scroll_group, "cue canvas cursor scroll");
	_canvas->add_scroller (*cg);

	/*a group to hold global rects like punch/loop indicators */
	global_rect_group = new ArdourCanvas::Container (hv_scroll_group);
	CANVAS_DEBUG_NAME (global_rect_group, "cue global rect group");

        transport_loop_range_rect = new ArdourCanvas::Rectangle (global_rect_group, ArdourCanvas::Rect (0.0, 0.0, 0.0, ArdourCanvas::COORD_MAX));
	CANVAS_DEBUG_NAME (transport_loop_range_rect, "cue loop rect");
	transport_loop_range_rect->hide();

	/*a group to hold time (measure) lines */
	time_line_group = new ArdourCanvas::Container (h_scroll_group);
	CANVAS_DEBUG_NAME (time_line_group, "cue  time line group");

	// used as rubberband rect
	rubberband_rect = new ArdourCanvas::Rectangle (hv_scroll_group, ArdourCanvas::Rect (0.0, 0.0, 0.0, 0.0));
	rubberband_rect->hide();
	rubberband_rect->set_outline_color (UIConfiguration::instance().color ("rubber band rect"));
	rubberband_rect->set_fill_color (UIConfiguration::instance().color_mod ("rubber band rect", "selection rect"));
	CANVAS_DEBUG_NAME (rubberband_rect, X_("cue rubberband rect"));


	Pango::FontDescription font (UIConfiguration::instance().get_SmallerFont());
	Pango::FontDescription larger_font (UIConfiguration::instance().get_SmallBoldFont());
	bbt_ruler = new ArdourCanvas::Ruler (time_line_group, &bbt_metric, ArdourCanvas::Rect (0, 0, ArdourCanvas::COORD_MAX, timebar_height));
	bbt_ruler->set_font_description (font);
	bbt_ruler->set_second_font_description (larger_font);
	Gtkmm2ext::Color base = UIConfiguration::instance().color ("ruler base");
	Gtkmm2ext::Color text = UIConfiguration::instance().color ("ruler text");
	bbt_ruler->set_fill_color (base);
	bbt_ruler->set_outline_color (text);
	CANVAS_DEBUG_NAME (bbt_ruler, "bbt ruler");

	data_group = new ArdourCanvas::Container (hv_scroll_group);
	data_group->move (ArdourCanvas::Duple (0., timebar_height * n_timebars));
	CANVAS_DEBUG_NAME (data_group, "cue data group");

	bg = new CueMidiBackground (data_group);
	_canvas_viewport->signal_size_allocate().connect (sigc::mem_fun(*this, &MidiCueEditor::canvas_allocate));

	_canvas->set_name ("MidiCueCanvas");
	_canvas->add_events (Gdk::POINTER_MOTION_HINT_MASK | Gdk::SCROLL_MASK | Gdk::KEY_PRESS_MASK | Gdk::KEY_RELEASE_MASK);
	_canvas->signal_enter_notify_event().connect (sigc::mem_fun(*this, &MidiCueEditor::canvas_enter_leave), false);
	_canvas->signal_leave_notify_event().connect (sigc::mem_fun(*this, &MidiCueEditor::canvas_enter_leave), false);
	_canvas->set_can_focus ();

	Bindings* midi_bindings = Bindings::get_bindings (X_("MIDI"));
	_canvas->set_data (X_("ardour-bindings"), midi_bindings);
}

bool
MidiCueEditor::canvas_enter_leave (GdkEventCrossing* ev)
{
	switch (ev->type) {
	case GDK_ENTER_NOTIFY:
		if (ev->detail != GDK_NOTIFY_INFERIOR) {
			_canvas_viewport->canvas()->grab_focus ();
			ActionManager::set_sensitive (_midi_actions, true);
			EditingContext::push_editing_context (this);
		}
		break;
	case GDK_LEAVE_NOTIFY:
		if (ev->detail != GDK_NOTIFY_INFERIOR) {
			ActionManager::set_sensitive (_midi_actions, false);
			ARDOUR_UI::instance()->reset_focus (_canvas_viewport);
			EditingContext::pop_editing_context ();
		}
	default:
		break;
	}
	return false;
}

void
MidiCueEditor::canvas_allocate (Gtk::Allocation alloc)
{
	bg->set_size (alloc.get_width(), alloc.get_height());

	if (view) {
		view->set_size (alloc.get_width(), alloc.get_height() - (timebar_height * n_timebars));
	}
}

timepos_t
MidiCueEditor::snap_to_grid (timepos_t const & presnap, Temporal::RoundMode direction, SnapPref gpref) const
{
	/* BBT time only */
	return snap_to_bbt (presnap, direction, gpref);
}

void
MidiCueEditor::snap_to_internal (timepos_t& start, Temporal::RoundMode direction, SnapPref pref, bool ensure_snap) const
{
	UIConfiguration const& uic (UIConfiguration::instance ());
	const timepos_t presnap = start;


	timepos_t dist = timepos_t::max (start.time_domain()); // this records the distance of the best snap result we've found so far
	timepos_t best = timepos_t::max (start.time_domain()); // this records the best snap-result we've found so far

	timepos_t pre (presnap);
	timepos_t post (snap_to_grid (pre, direction, pref));

	check_best_snap (presnap, post, dist, best);

	if (timepos_t::max (start.time_domain()) == best) {
		return;
	}

	/* now check "magnetic" state: is the grid within reasonable on-screen distance to trigger a snap?
	 * this also helps to avoid snapping to somewhere the user can't see.  (i.e.: I clicked on a region and it disappeared!!)
	 * ToDo: Perhaps this should only occur if EditPointMouse?
	 */
	samplecnt_t snap_threshold_s = pixel_to_sample (uic.get_snap_threshold ());

	if (!ensure_snap && ::llabs (best.distance (presnap).samples()) > snap_threshold_s) {
		return;
	}

	start = best;
}

void
MidiCueEditor::reset_zoom (samplecnt_t spp)
{
	CueEditor::reset_zoom (spp);

	if (view) {
		view->set_samples_per_pixel (spp);
	}

	bbt_ruler->set_range (0, current_page_samples());
}

samplecnt_t
MidiCueEditor::current_page_samples() const
{
	return (samplecnt_t) _visible_canvas_width* samples_per_pixel;
}

void
MidiCueEditor::apply_midi_note_edit_op (ARDOUR::MidiOperator& op, const RegionSelection& rs)
{
}

PBD::Command*
MidiCueEditor::apply_midi_note_edit_op_to_region (ARDOUR::MidiOperator& op, MidiRegionView& mrv)
{
#if 0
	Evoral::Sequence<Temporal::Beats>::Notes selected;
	mrv.selection_as_notelist (selected, true);

	if (selected.empty()) {
		return 0;
	}

	vector<Evoral::Sequence<Temporal::Beats>::Notes> v;
	v.push_back (selected);

	timepos_t pos = mrv.midi_region()->source_position();

	return op (mrv.midi_region()->model(), pos.beats(), v);
#endif

	return nullptr;
}

bool
MidiCueEditor::canvas_note_event (GdkEvent* event, ArdourCanvas::Item* item)
{
	return typed_event (item, event, NoteItem);
}

Gtk::Widget&
MidiCueEditor::viewport()
{
	return *_canvas_viewport;
}

void
MidiCueEditor::set_region (std::shared_ptr<ARDOUR::MidiTrack> t, std::shared_ptr<ARDOUR::MidiRegion> r)
{
	delete view;
	view = nullptr;

	if (!t || !r) {
		return;
	}

	view = new MidiCueView (t, *data_group, *this, *bg, 0xff0000ff);
	view->set_region (r);

	bg->set_view (view);

	/* Compute zoom level to show entire source plus some margin if possible */

	std::shared_ptr<Temporal::TempoMap> map;

	Temporal::timecnt_t duration = Temporal::timecnt_t (r->midi_source()->length().beats());
	/* XXX build tempo map from source */
	map.reset (new Temporal::TempoMap (Temporal::Tempo (120, 4), Temporal::Meter (4, 4)));

	{
		EditingContext::TempoMapScope tms (*this, map);
		double width = bg->width();
		samplecnt_t samples = duration.samples();

		samplecnt_t spp = floor (samples / width);
		reset_zoom (spp);
	}
}

bool
MidiCueEditor::button_press_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type)
{
	switch (event->button.button) {
	case 1:
		return button_press_handler_1 (item, event, item_type);
		break;

	case 2:
		return button_press_handler_2 (item, event, item_type);
		break;

	case 3:
		break;

	default:
		return button_press_dispatch (&event->button);
		break;

	}

	return false;
}

bool
MidiCueEditor::button_press_handler_1 (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type)
{
	NoteBase* note = nullptr;

	if (mouse_mode == Editing::MouseContent) {
		switch (item_type) {
		case NoteItem:
			/* Existing note: allow trimming/motion */
			if ((note = reinterpret_cast<NoteBase*> (item->get_data ("notebase")))) {
				if (note->big_enough_to_trim() && note->mouse_near_ends()) {
					_drags->set (new NoteResizeDrag (*this, item), event, get_canvas_cursor());
				} else {
					_drags->set (new NoteDrag (*this, item), event);
				}
			}
			return true;
		default:
			break;
		}
	}

	return false;
}

bool
MidiCueEditor::button_press_handler_2 (ArdourCanvas::Item*, GdkEvent*, ItemType)
{
	return true;
}

bool
MidiCueEditor::button_release_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type)
{
	std::cerr << "hey\n";

	if (Keyboard::is_context_menu_event (&event->button)) {
		switch (item_type) {
		case NoteItem:
			if (internal_editing()) {
				popup_note_context_menu (item, event);
				return true;
			}
			break;
		default:
			break;
		}
	}

	return false;
}

bool
MidiCueEditor::button_press_dispatch (GdkEventButton* ev)
{
	/* this function is intended only for buttons 4 and above. */

	Gtkmm2ext::MouseButton b (ev->state, ev->button);
	return button_bindings->activate (b, Gtkmm2ext::Bindings::Press);
}

bool
MidiCueEditor::button_release_dispatch (GdkEventButton* ev)
{
	/* this function is intended only for buttons 4 and above. */

	Gtkmm2ext::MouseButton b (ev->state, ev->button);
	return button_bindings->activate (b, Gtkmm2ext::Bindings::Release);
}

bool
MidiCueEditor::motion_handler (ArdourCanvas::Item*, GdkEvent*, bool from_autoscroll)
{
	return true;
}

bool
MidiCueEditor::enter_handler (ArdourCanvas::Item*, GdkEvent*, ItemType)
{
	return true;
}

bool
MidiCueEditor::leave_handler (ArdourCanvas::Item*, GdkEvent*, ItemType)
{
	return true;
}

bool
MidiCueEditor::key_press_handler (ArdourCanvas::Item*, GdkEvent* ev, ItemType)
{

	switch (ev->key.keyval) {
	case GDK_d:
		set_mouse_mode (Editing::MouseDraw);
		std::cerr << "draw\n";
		break;
	case GDK_e:
		set_mouse_mode (Editing::MouseContent);
		std::cerr << "content/edit\n";
		break;
	}

	return true;
}

bool
MidiCueEditor::key_release_handler (ArdourCanvas::Item*, GdkEvent*, ItemType)
{
	return true;
}

void
MidiCueEditor::set_mouse_mode (Editing::MouseMode m, bool force)
{
	if (m != Editing::MouseDraw && m != Editing::MouseContent) {
		return;
	}

	mouse_mode = m;
}

void
MidiCueEditor::step_mouse_mode (bool next)
{
}

Editing::MouseMode
MidiCueEditor::current_mouse_mode () const
{
	return mouse_mode;
}

bool
MidiCueEditor::internal_editing() const
{
	return true;
}

RegionSelection
MidiCueEditor::region_selection()
{
	RegionSelection rs;
	return rs;
}

static void
edit_last_mark_label (std::vector<ArdourCanvas::Ruler::Mark>& marks, const std::string& newlabel)
{
	ArdourCanvas::Ruler::Mark copy = marks.back();
	copy.label = newlabel;
	marks.pop_back ();
	marks.push_back (copy);
}

void
MidiCueEditor::metric_get_bbt (std::vector<ArdourCanvas::Ruler::Mark>& marks, samplepos_t leftmost, samplepos_t rightmost, gint /*maxchars*/)
{
	if (_session == 0) {
		return;
	}

	std::shared_ptr<Temporal::TempoMap> tmap;

	if (view) {
		/* XXX MAKE MAP FROM REGION->SOURCE */
		tmap.reset (new Temporal::TempoMap (Temporal::Tempo (120, 4), Temporal::Meter (4, 4)));
	} else {
		tmap.reset (new Temporal::TempoMap (Temporal::Tempo (120, 4), Temporal::Meter (4, 4)));
	}

	EditingContext::TempoMapScope tms (*this, tmap);
	Temporal::TempoMapPoints::const_iterator i;

	char buf[64];
	Temporal::BBT_Time next_beat;
	double bbt_position_of_helper;
	bool helper_active = false;
	ArdourCanvas::Ruler::Mark mark;
	const samplecnt_t sr (_session->sample_rate());

	Temporal::TempoMapPoints grid;
	grid.reserve (4096);


	/* prevent negative values of leftmost from creeping into tempomap
	 */

	const Beats left = tmap->quarters_at_sample (leftmost).round_down_to_beat();
	const Beats lower_beat = (left < Beats() ? Beats() : left);

	using std::max;

	switch (bbt_ruler_scale) {

	case bbt_show_quarters:
		tmap->get_grid (grid, max (tmap->superclock_at (lower_beat), (superclock_t) 0), samples_to_superclock (rightmost, sr), 0, 1);
		break;
	case bbt_show_eighths:
		tmap->get_grid (grid, max (tmap->superclock_at (lower_beat), (superclock_t) 0), samples_to_superclock (rightmost, sr), 0, 2);
		break;
	case bbt_show_sixteenths:
		tmap->get_grid (grid, max (tmap->superclock_at (lower_beat), (superclock_t) 0), samples_to_superclock (rightmost, sr), 0, 4);
		break;
	case bbt_show_thirtyseconds:
		tmap->get_grid (grid, max (tmap->superclock_at (lower_beat), (superclock_t) 0), samples_to_superclock (rightmost, sr), 0, 8);
		break;
	case bbt_show_sixtyfourths:
		tmap->get_grid (grid, max (tmap->superclock_at (lower_beat), (superclock_t) 0), samples_to_superclock (rightmost, sr), 0, 16);
		break;
	case bbt_show_onetwentyeighths:
		tmap->get_grid (grid, max (tmap->superclock_at (lower_beat), (superclock_t) 0), samples_to_superclock (rightmost, sr), 0, 32);
		break;

	case bbt_show_1:
		tmap->get_grid (grid, max (tmap->superclock_at (lower_beat), (superclock_t) 0), samples_to_superclock (rightmost, sr), 1);
		break;

	case bbt_show_4:
		tmap->get_grid (grid, max (tmap->superclock_at (lower_beat), (superclock_t) 0), samples_to_superclock (rightmost, sr), 4);
		break;

	case bbt_show_16:
		tmap->get_grid (grid, max (tmap->superclock_at (lower_beat), (superclock_t) 0), samples_to_superclock (rightmost, sr), 16);
		break;

	case bbt_show_64:
		tmap->get_grid (grid, max (tmap->superclock_at (lower_beat), (superclock_t) 0), samples_to_superclock (rightmost, sr), 64);
		break;

	default:
		/* bbt_show_many */
		tmap->get_grid (grid, max (tmap->superclock_at (lower_beat), (superclock_t) 0), samples_to_superclock (rightmost, sr), 128);
		break;
	}

#if 0 // DEBUG GRID
	for (auto const& g : grid) {
		std::cout << "Grid " << g.time() <<  " Beats: " << g.beats() << " BBT: " << g.bbt() << " sample: " << g.sample(_session->nominal_sample_rate ()) << "\n"; 
	}
#endif

	if (distance (grid.begin(), grid.end()) == 0) {
		return;
	}

	/* we can accent certain lines depending on the user's Grid choice */
	/* for example, even in a 4/4 meter we can draw a grid with triplet-feel */
	/* and in this case you will want the accents on '3s' not '2s' */
	uint32_t bbt_divisor = 2;

	using namespace Editing;

	switch (_grid_type) {
	case GridTypeBeatDiv3:
		bbt_divisor = 3;
		break;
	case GridTypeBeatDiv5:
		bbt_divisor = 5;
		break;
	case GridTypeBeatDiv6:
		bbt_divisor = 3;
		break;
	case GridTypeBeatDiv7:
		bbt_divisor = 7;
		break;
	case GridTypeBeatDiv10:
		bbt_divisor = 5;
		break;
	case GridTypeBeatDiv12:
		bbt_divisor = 3;
		break;
	case GridTypeBeatDiv14:
		bbt_divisor = 7;
		break;
	case GridTypeBeatDiv16:
		break;
	case GridTypeBeatDiv20:
		bbt_divisor = 5;
		break;
	case GridTypeBeatDiv24:
		bbt_divisor = 6;
		break;
	case GridTypeBeatDiv28:
		bbt_divisor = 7;
		break;
	case GridTypeBeatDiv32:
		break;
	default:
		bbt_divisor = 2;
		break;
	}

	uint32_t bbt_beat_subdivision = 1;
	switch (bbt_ruler_scale) {
	case bbt_show_quarters:
		bbt_beat_subdivision = 1;
		break;
	case bbt_show_eighths:
		bbt_beat_subdivision = 1;
		break;
	case bbt_show_sixteenths:
		bbt_beat_subdivision = 2;
		break;
	case bbt_show_thirtyseconds:
		bbt_beat_subdivision = 4;
		break;
	case bbt_show_sixtyfourths:
		bbt_beat_subdivision = 8;
		break;
	case bbt_show_onetwentyeighths:
		bbt_beat_subdivision = 16;
		break;
	default:
		bbt_beat_subdivision = 1;
		break;
	}

	bbt_beat_subdivision *= bbt_divisor;

	switch (bbt_ruler_scale) {

	case bbt_show_many:
		snprintf (buf, sizeof(buf), "cannot handle %" PRIu32 " bars", bbt_bars);
		mark.style = ArdourCanvas::Ruler::Mark::Major;
		mark.label = buf;
		mark.position = leftmost;
		marks.push_back (mark);
		break;

	case bbt_show_64:
			for (i = grid.begin(); i != grid.end(); i++) {
				BBT_Time bbt ((*i).bbt());
				if (bbt.is_bar()) {
					if (bbt.bars % 64 == 1) {
						if (bbt.bars % 256 == 1) {
							snprintf (buf, sizeof(buf), "%" PRIu32, bbt.bars);
							mark.style = ArdourCanvas::Ruler::Mark::Major;
						} else {
							buf[0] = '\0';
							if (bbt.bars % 256 == 129)  {
								mark.style = ArdourCanvas::Ruler::Mark::Minor;
							} else {
								mark.style = ArdourCanvas::Ruler::Mark::Micro;
							}
						}
						mark.label = buf;
						mark.position = (*i).sample (sr);
						marks.push_back (mark);
					}
				}
			}
			break;

	case bbt_show_16:
		for (i = grid.begin(); i != grid.end(); i++) {
			BBT_Time bbt ((*i).bbt());
			if (bbt.is_bar()) {
			  if (bbt.bars % 16 == 1) {
				if (bbt.bars % 64 == 1) {
					snprintf (buf, sizeof(buf), "%" PRIu32, bbt.bars);
					mark.style = ArdourCanvas::Ruler::Mark::Major;
				} else {
					buf[0] = '\0';
					if (bbt.bars % 64 == 33)  {
						mark.style = ArdourCanvas::Ruler::Mark::Minor;
					} else {
						mark.style = ArdourCanvas::Ruler::Mark::Micro;
					}
				}
				mark.label = buf;
				mark.position = (*i).sample(sr);
				marks.push_back (mark);
			  }
			}
		}
	  break;

	case bbt_show_4:
		for (i = grid.begin(); i != grid.end(); ++i) {
			BBT_Time bbt ((*i).bbt());
			if (bbt.is_bar()) {
				if (bbt.bars % 4 == 1) {
					if (bbt.bars % 16 == 1) {
						snprintf (buf, sizeof(buf), "%" PRIu32, bbt.bars);
						mark.style = ArdourCanvas::Ruler::Mark::Major;
				} else {
						buf[0] = '\0';
						mark.style = ArdourCanvas::Ruler::Mark::Minor;
					}
					mark.label = buf;
					mark.position = (*i).sample (sr);
					marks.push_back (mark);
				}
			}
		}
	  break;

	case bbt_show_1:
		for (i = grid.begin(); i != grid.end(); ++i) {
			BBT_Time bbt ((*i).bbt());
			if (bbt.is_bar()) {
				snprintf (buf, sizeof(buf), "%" PRIu32, bbt.bars);
				mark.style = ArdourCanvas::Ruler::Mark::Major;
				mark.label = buf;
				mark.position = (*i).sample (sr);
				marks.push_back (mark);
			}
		}
	break;

	case bbt_show_quarters:

		mark.label = "";
		mark.position = leftmost;
		mark.style = ArdourCanvas::Ruler::Mark::Micro;
		marks.push_back (mark);

		for (i = grid.begin(); i != grid.end(); ++i) {

			BBT_Time bbt ((*i).bbt());

			if ((*i).sample (sr) < leftmost && (bbt_bar_helper_on)) {
				snprintf (buf, sizeof(buf), "<%" PRIu32 "|%" PRIu32, bbt.bars, bbt.beats);
				edit_last_mark_label (marks, buf);
			} else {

				if (bbt.is_bar()) {
					mark.style = ArdourCanvas::Ruler::Mark::Major;
					snprintf (buf, sizeof(buf), "%" PRIu32, bbt.bars);
				} else if ((bbt.beats % 2) == 1) {
					mark.style = ArdourCanvas::Ruler::Mark::Minor;
					buf[0] = '\0';
				} else {
					mark.style = ArdourCanvas::Ruler::Mark::Micro;
					buf[0] = '\0';
				}
				mark.label = buf;
				mark.position = (*i).sample (sr);
				marks.push_back (mark);
			}
		}
		break;

	case bbt_show_eighths:
	case bbt_show_sixteenths:
	case bbt_show_thirtyseconds:
	case bbt_show_sixtyfourths:
	case bbt_show_onetwentyeighths:

		bbt_position_of_helper = leftmost + (3 * get_current_zoom ());

		mark.label = "";
		mark.position = leftmost;
		mark.style = ArdourCanvas::Ruler::Mark::Micro;
		marks.push_back (mark);

		for (i = grid.begin(); i != grid.end(); ++i) {

			BBT_Time bbt ((*i).bbt());

			if ((*i).sample (sr) < leftmost && (bbt_bar_helper_on)) {
				snprintf (buf, sizeof(buf), "<%" PRIu32 "|%" PRIu32, bbt.bars, bbt.beats);
				edit_last_mark_label (marks, buf);
				helper_active = true;
			} else {

				if (bbt.is_bar()) {
					mark.style = ArdourCanvas::Ruler::Mark::Major;
					snprintf (buf, sizeof(buf), "%" PRIu32, bbt.bars);
				} else if (bbt.ticks == 0) {
					mark.style = ArdourCanvas::Ruler::Mark::Minor;
					snprintf (buf, sizeof(buf), "%" PRIu32, bbt.beats);
				} else {
					mark.style = ArdourCanvas::Ruler::Mark::Micro;
					buf[0] = '\0';
				}

				if (((*i).sample(sr) < bbt_position_of_helper) && helper_active) {
					buf[0] = '\0';
				}
				mark.label =  buf;
				mark.position = (*i).sample (sr);
				marks.push_back (mark);
			}
		}

		break;
	}
}