#include <gtkmm.h>
#include <gtkmm2ext/gtk_ui.h>
-#include "pbd/stacktrace.h"
#include "ardour/playlist.h"
-#include "ardour/audioregion.h"
-#include "ardour/audiosource.h"
-#include "ardour/audio_diskstream.h"
#include "ardour/session.h"
+#include "canvas/polygon.h"
+#include "canvas/debug.h"
+#include "canvas/pixbuf.h"
+#include "canvas/text.h"
+#include "canvas/line.h"
+
#include "ardour_ui.h"
+#include "global_signals.h"
#include "streamview.h"
#include "region_view.h"
#include "automation_region_view.h"
#include "route_time_axis.h"
-#include "simplerect.h"
-#include "simpleline.h"
-#include "waveview.h"
#include "public_editor.h"
#include "region_editor.h"
#include "ghostregion.h"
#include "route_time_axis.h"
+#include "ui_config.h"
#include "utils.h"
#include "rgb_macros.h"
#include "gui_thread.h"
using namespace ARDOUR;
using namespace PBD;
using namespace Editing;
+using namespace Gtk;
using namespace ArdourCanvas;
static const int32_t sync_mark_width = 9;
, _pixel_width(1.0)
, in_destructor(false)
, wait_for_data(false)
- , _time_converter(r->session().tempo_map(), r->position())
+ , _silence_text (0)
+ , _region_relative_time_converter(r->session().tempo_map(), r->position())
+ , _source_relative_time_converter(r->session().tempo_map(), r->position() - r->start())
{
- GhostRegion::CatchDeletion.connect (*this, invalidator (*this), ui_bind (&RegionView::remove_ghost, this, _1), gui_context());
+ GhostRegion::CatchDeletion.connect (*this, invalidator (*this), boost::bind (&RegionView::remove_ghost, this, _1), gui_context());
}
RegionView::RegionView (const RegionView& other)
: sigc::trackable(other)
, TimeAxisViewItem (other)
- , _time_converter(other._time_converter)
+ , _silence_text (0)
+ , _region_relative_time_converter(other.region_relative_time_converter())
+ , _source_relative_time_converter(other.source_relative_time_converter())
{
/* derived concrete type will call init () */
valid = false;
_pixel_width = other._pixel_width;
- GhostRegion::CatchDeletion.connect (*this, invalidator (*this), ui_bind (&RegionView::remove_ghost, this, _1), gui_context());
+ GhostRegion::CatchDeletion.connect (*this, invalidator (*this), boost::bind (&RegionView::remove_ghost, this, _1), gui_context());
}
RegionView::RegionView (const RegionView& other, boost::shared_ptr<Region> other_region)
: sigc::trackable(other)
, TimeAxisViewItem (other)
- , _time_converter(other._time_converter)
+ , _silence_text (0)
+ , _region_relative_time_converter(other_region->session().tempo_map(), other_region->position())
+ , _source_relative_time_converter(other_region->session().tempo_map(), other_region->position() - other_region->start())
{
/* this is a pseudo-copy constructor used when dragging regions
around on the canvas.
valid = false;
_pixel_width = other._pixel_width;
- GhostRegion::CatchDeletion.connect (*this, invalidator (*this), ui_bind (&RegionView::remove_ghost, this, _1), gui_context());
+ GhostRegion::CatchDeletion.connect (*this, invalidator (*this), boost::bind (&RegionView::remove_ghost, this, _1), gui_context());
}
RegionView::RegionView (ArdourCanvas::Group* parent,
, _pixel_width(1.0)
, in_destructor(false)
, wait_for_data(false)
- , _time_converter(r->session().tempo_map(), r->position())
+ , _silence_text (0)
+ , _region_relative_time_converter(r->session().tempo_map(), r->position())
+ , _source_relative_time_converter(r->session().tempo_map(), r->position() - r->start())
{
}
if (name_highlight) {
name_highlight->set_data ("regionview", this);
- name_highlight->signal_event().connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_region_view_name_highlight_event), name_highlight, this));
+ name_highlight->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_region_view_name_highlight_event), name_highlight, this));
if (frame_handle_start) {
frame_handle_start->set_data ("regionview", this);
frame_handle_start->set_data ("isleft", (void*) 1);
- frame_handle_start->signal_event().connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_frame_handle_event), frame_handle_start, this));
+ frame_handle_start->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_frame_handle_event), frame_handle_start, this));
frame_handle_start->raise_to_top();
}
if (frame_handle_end) {
frame_handle_end->set_data ("regionview", this);
frame_handle_end->set_data ("isleft", (void*) 0);
- frame_handle_end->signal_event().connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_frame_handle_event), frame_handle_end, this));
+ frame_handle_end->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_frame_handle_event), frame_handle_end, this));
frame_handle_end->raise_to_top();
}
}
- if (name_pixbuf) {
- name_pixbuf->set_data ("regionview", this);
- name_pixbuf->signal_event().connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_region_view_name_event), name_pixbuf, this));
+ if (name_text) {
+ name_text->set_data ("regionview", this);
+ name_text->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_region_view_name_event), name_text, this));
}
if (wfd) {
set_height (trackview.current_height());
- _region->PropertyChanged.connect (*this, invalidator (*this), ui_bind (&RegionView::region_changed, this, _1), gui_context());
-
- group->signal_event().connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_region_view_event), group, this));
+ _region->PropertyChanged.connect (*this, invalidator (*this), boost::bind (&RegionView::region_changed, this, _1), gui_context());
+
+ group->Event.connect (sigc::bind (sigc::mem_fun (PublicEditor::instance(), &PublicEditor::canvas_region_view_event), group, this));
set_colors ();
delete *g;
}
- for (list<ArdourCanvas::SimpleRect*>::iterator i = _coverage_frames.begin (); i != _coverage_frames.end (); ++i) {
+ for (list<ArdourCanvas::Rectangle*>::iterator i = _coverage_frames.begin (); i != _coverage_frames.end (); ++i) {
delete *i;
}
+ drop_silent_frames ();
+
delete editor;
}
+void
+RegionView::set_silent_frames (const AudioIntervalResult& silences, double /*threshold*/)
+{
+ framecnt_t shortest = max_framecnt;
+
+ /* remove old silent frames */
+ drop_silent_frames ();
+
+ if (silences.empty()) {
+ return;
+ }
+
+ uint32_t const color = ARDOUR_UI::config()->get_canvasvar_Silence();
+
+ for (AudioIntervalResult::const_iterator i = silences.begin(); i != silences.end(); ++i) {
+
+ ArdourCanvas::Rectangle* cr = new ArdourCanvas::Rectangle (group);
+ cr->set_ignore_events (true);
+ _silent_frames.push_back (cr);
+
+ /* coordinates for the rect are relative to the regionview origin */
+
+ cr->set_x0 (trackview.editor().sample_to_pixel (i->first - _region->start()));
+ cr->set_x1 (trackview.editor().sample_to_pixel (i->second - _region->start()));
+ cr->set_y0 (1);
+ cr->set_y1 (_height - 2);
+ cr->set_outline (false);
+ cr->set_fill_color (color);
+
+ shortest = min (shortest, i->second - i->first);
+ }
+
+ /* Find shortest audible segment */
+ framecnt_t shortest_audible = max_framecnt;
+
+ framecnt_t s = _region->start();
+ for (AudioIntervalResult::const_iterator i = silences.begin(); i != silences.end(); ++i) {
+ framecnt_t const dur = i->first - s;
+ if (dur > 0) {
+ shortest_audible = min (shortest_audible, dur);
+ }
+
+ s = i->second;
+ }
+
+ framecnt_t const dur = _region->start() + _region->length() - 1 - s;
+ if (dur > 0) {
+ shortest_audible = min (shortest_audible, dur);
+ }
+
+ _silence_text = new ArdourCanvas::Text (group);
+ _silence_text->set_ignore_events (true);
+ _silence_text->set_font_description (get_font_for_style (N_("SilenceText")));
+ _silence_text->set_color (ARDOUR_UI::config()->get_canvasvar_SilenceText());
+
+ /* both positions are relative to the region start offset in source */
+
+ _silence_text->set_x_position (trackview.editor().sample_to_pixel (silences.front().first - _region->start()) + 10.0);
+ _silence_text->set_y_position (20.0);
+
+ double ms = (float) shortest/_region->session().frame_rate();
+
+ /* ms are now in seconds */
+
+ char const * sunits;
+
+ if (ms >= 60.0) {
+ sunits = _("minutes");
+ ms /= 60.0;
+ } else if (ms < 1.0) {
+ sunits = _("msecs");
+ ms *= 1000.0;
+ } else {
+ sunits = _("secs");
+ }
+
+ string text = string_compose (ngettext ("%1 silent segment", "%1 silent segments", silences.size()), silences.size())
+ + ", "
+ + string_compose (_("shortest = %1 %2"), ms, sunits);
+
+ if (shortest_audible != max_framepos) {
+ /* ms are now in seconds */
+ double ma = (float) shortest_audible / _region->session().frame_rate();
+ char const * aunits;
+
+ if (ma >= 60.0) {
+ aunits = _("minutes");
+ ma /= 60.0;
+ } else if (ma < 1.0) {
+ aunits = _("msecs");
+ ma *= 1000.0;
+ } else {
+ aunits = _("secs");
+ }
+
+ text += string_compose (_("\n (shortest audible segment = %1 %2)"), ma, aunits);
+ }
+
+ _silence_text->set (text);
+}
+
+void
+RegionView::hide_silent_frames ()
+{
+ for (list<ArdourCanvas::Rectangle*>::iterator i = _silent_frames.begin (); i != _silent_frames.end (); ++i) {
+ (*i)->hide ();
+ }
+ _silence_text->hide();
+}
+
+void
+RegionView::drop_silent_frames ()
+{
+ for (list<ArdourCanvas::Rectangle*>::iterator i = _silent_frames.begin (); i != _silent_frames.end (); ++i) {
+ delete *i;
+ }
+ _silent_frames.clear ();
+
+ delete _silence_text;
+ _silence_text = 0;
+}
+
gint
RegionView::_lock_toggle (ArdourCanvas::Item*, GdkEvent* ev, void* arg)
{
if (what_changed.contains (ARDOUR::Properties::locked)) {
region_locked ();
}
+ if (what_changed.contains (ARDOUR::Properties::locked)) {
+ /* name will show locked status */
+ region_renamed ();
+ }
}
void
if (what_changed.contains (ARDOUR::Properties::position)) {
set_position (_region->position(), 0);
- _time_converter.set_origin_b (_region->position());
+ _region_relative_time_converter.set_origin_b (_region->position());
+ }
+
+ if (what_changed.contains (ARDOUR::Properties::start) || what_changed.contains (ARDOUR::Properties::position)) {
+ _source_relative_time_converter.set_origin_b (_region->position() - _region->start());
}
PropertyChange s_and_l;
set_duration (_region->length(), 0);
- unit_length = _region->length() / samples_per_unit;
+ unit_length = _region->length() / samples_per_pixel;
for (vector<GhostRegion*>::iterator i = ghosts.begin(); i != ghosts.end(); ++i) {
if (delta) {
for (vector<GhostRegion*>::iterator i = ghosts.begin(); i != ghosts.end(); ++i) {
- (*i)->group->move (delta, 0.0);
+ (*i)->group->move (ArdourCanvas::Duple (delta, 0.0));
}
}
}
void
-RegionView::set_samples_per_unit (gdouble spu)
+RegionView::set_samples_per_pixel (double fpp)
{
- TimeAxisViewItem::set_samples_per_unit (spu);
+ TimeAxisViewItem::set_samples_per_pixel (fpp);
for (vector<GhostRegion*>::iterator i = ghosts.begin(); i != ghosts.end(); ++i) {
- (*i)->set_samples_per_unit (spu);
- (*i)->set_duration (_region->length() / samples_per_unit);
+ (*i)->set_samples_per_pixel (fpp);
+ (*i)->set_duration (_region->length() / fpp);
}
region_sync_changed ();
}
for (vector<GhostRegion*>::iterator i = ghosts.begin(); i != ghosts.end(); ++i) {
- (*i)->set_duration (_region->length() / samples_per_unit);
+ (*i)->set_duration (_region->length() / samples_per_pixel);
}
return true;
TimeAxisViewItem::set_colors ();
if (sync_mark) {
- sync_mark->property_fill_color_rgba() = RGBA_TO_UINT(0,255,0,255); // fill_color; // FIXME make a themeable colour
- sync_line->property_fill_color_rgba() = RGBA_TO_UINT(0,255,0,255); // fill_color; // FIXME make a themeable colour
+ /* XXX: make these colours themable */
+ sync_mark->set_fill_color (RGBA_TO_UINT (0, 255, 0, 255));
+ sync_line->set_outline_color (RGBA_TO_UINT (0, 255, 0, 255));
}
}
str += '{';
str += _region->name();
str += '}';
+ } else if (_region->video_locked()) {
+ str += '[';
+ str += _region->name();
+ str += ']';
} else {
str = _region->name();
}
RegionView::region_sync_changed ()
{
int sync_dir;
- nframes_t sync_offset;
+ framecnt_t sync_offset;
sync_offset = _region->sync_offset (sync_dir);
/* points set below */
- sync_mark = new ArdourCanvas::Polygon (*group);
- sync_mark->property_fill_color_rgba() = RGBA_TO_UINT(0,255,0,255); // fill_color; // FIXME make a themeable colour
+ sync_mark = new ArdourCanvas::Polygon (group);
+ CANVAS_DEBUG_NAME (sync_mark, string_compose ("sync mark for %1", get_item_name()));
+ sync_mark->set_fill_color (RGBA_TO_UINT(0,255,0,255)); // FIXME make a themeable colour
- sync_line = new ArdourCanvas::Line (*group);
- sync_line->property_fill_color_rgba() = RGBA_TO_UINT(0,255,0,255); // fill_color; // FIXME make a themeable colour
- sync_line->property_width_pixels() = 1;
+ sync_line = new ArdourCanvas::Line (group);
+ CANVAS_DEBUG_NAME (sync_line, string_compose ("sync mark for %1", get_item_name()));
+ sync_line->set_outline_color (RGBA_TO_UINT(0,255,0,255)); // FIXME make a themeable colour
}
- /* this has to handle both a genuine change of position, a change of samples_per_unit,
+ /* this has to handle both a genuine change of position, a change of samples_per_pixel
and a change in the bounds of the _region->
*/
//points = sync_mark->property_points().get_value();
- double offset = sync_offset / samples_per_unit;
- points.push_back (Gnome::Art::Point (offset - ((sync_mark_width-1)/2), 1));
- points.push_back (Gnome::Art::Point (offset + ((sync_mark_width-1)/2), 1));
- points.push_back (Gnome::Art::Point (offset, sync_mark_width - 1));
- points.push_back (Gnome::Art::Point (offset - ((sync_mark_width-1)/2), 1));
- sync_mark->property_points().set_value (points);
+ double offset = sync_offset / samples_per_pixel;
+ points.push_back (ArdourCanvas::Duple (offset - ((sync_mark_width-1)/2), 1));
+ points.push_back (ArdourCanvas::Duple (offset + ((sync_mark_width-1)/2), 1));
+ points.push_back (ArdourCanvas::Duple (offset, sync_mark_width - 1));
+ points.push_back (ArdourCanvas::Duple (offset - ((sync_mark_width-1)/2), 1));
+ sync_mark->set (points);
sync_mark->show ();
- points.clear ();
- points.push_back (Gnome::Art::Point (offset, 0));
- points.push_back (Gnome::Art::Point (offset, trackview.current_height() - NAME_HIGHLIGHT_SIZE));
-
- sync_line->property_points().set_value (points);
+ sync_line->set (ArdourCanvas::Duple (offset, 0), ArdourCanvas::Duple (offset, trackview.current_height() - NAME_HIGHLIGHT_SIZE));
sync_line->show ();
}
}
return;
}
- get_canvas_group()->move (x_delta, y_delta);
+ get_canvas_group()->move (ArdourCanvas::Duple (x_delta, y_delta));
/* note: ghosts never leave their tracks so y_delta for them is always zero */
for (vector<GhostRegion*>::iterator i = ghosts.begin(); i != ghosts.end(); ++i) {
- (*i)->group->move (x_delta, 0.0);
+ (*i)->group->move (ArdourCanvas::Duple (x_delta, 0.0));
}
}
if (sync_line) {
Points points;
int sync_dir;
- nframes_t sync_offset;
+ framecnt_t sync_offset;
sync_offset = _region->sync_offset (sync_dir);
- double offset = sync_offset / samples_per_unit;
+ double offset = sync_offset / samples_per_pixel;
+
+ sync_line->set (
+ ArdourCanvas::Duple (offset, 0),
+ ArdourCanvas::Duple (offset, h - NAME_HIGHLIGHT_SIZE)
+ );
+ }
- points.push_back (Gnome::Art::Point (offset, 0));
- points.push_back (Gnome::Art::Point (offset, h - NAME_HIGHLIGHT_SIZE));
- sync_line->property_points().set_value (points);
+ for (list<ArdourCanvas::Rectangle*>::iterator i = _coverage_frames.begin(); i != _coverage_frames.end(); ++i) {
+ (*i)->set_y1 (h + 1);
}
- for (list<ArdourCanvas::SimpleRect*>::iterator i = _coverage_frames.begin(); i != _coverage_frames.end(); ++i) {
- (*i)->property_y2() = h + 1;
+ for (list<ArdourCanvas::Rectangle*>::iterator i = _silent_frames.begin(); i != _silent_frames.end(); ++i) {
+ (*i)->set_y1 (h + 1);
}
+
}
/** Remove old coverage frames and make new ones, if we're in a LayerDisplay mode
RegionView::update_coverage_frames (LayerDisplay d)
{
/* remove old coverage frames */
- for (list<ArdourCanvas::SimpleRect*>::iterator i = _coverage_frames.begin (); i != _coverage_frames.end (); ++i) {
+ for (list<ArdourCanvas::Rectangle*>::iterator i = _coverage_frames.begin (); i != _coverage_frames.end (); ++i) {
delete *i;
}
return;
}
- nframes_t const position = _region->first_frame ();
- nframes_t t = position;
- nframes_t const end = _region->last_frame ();
+ framepos_t const position = _region->first_frame ();
+ framepos_t t = position;
+ framepos_t const end = _region->last_frame ();
- ArdourCanvas::SimpleRect* cr = 0;
+ ArdourCanvas::Rectangle* cr = 0;
bool me = false;
- uint32_t const color = frame->property_fill_color_rgba ();
- uint32_t const base_alpha = UINT_RGBA_A (color);
+ /* the color that will be used to show parts of regions that will not be heard */
+ uint32_t const non_playing_color = ARDOUR_UI::config()->get_canvasvar_CoveredRegion ();
while (t < end) {
/* finish off any old rect, if required */
if (cr && me != new_me) {
- cr->property_x2() = trackview.editor().frame_to_pixel (t - position);
+ cr->set_x1 (trackview.editor().sample_to_pixel (t - position));
}
/* start off any new rect, if required */
if (cr == 0 || me != new_me) {
- cr = new ArdourCanvas::SimpleRect (*group);
+ cr = new ArdourCanvas::Rectangle (group);
_coverage_frames.push_back (cr);
- cr->property_x1() = trackview.editor().frame_to_pixel (t - position);
- cr->property_y1() = 1;
- cr->property_y2() = _height + 1;
- cr->property_outline_pixels() = 0;
- /* areas that will be played get a lower alpha */
- uint32_t alpha = base_alpha;
+ cr->set_x0 (trackview.editor().sample_to_pixel (t - position));
+ cr->set_y0 (1);
+ cr->set_y1 (_height + 1);
+ cr->set_outline (false);
+ cr->set_ignore_events (true);
if (new_me) {
- alpha /= 2;
+ cr->set_fill_color (UINT_RGBA_CHANGE_A (non_playing_color, 0));
+ } else {
+ cr->set_fill_color (non_playing_color);
}
- cr->property_fill_color_rgba () = UINT_RGBA_CHANGE_A (color, alpha);
}
t = pl->find_next_region_boundary (t, 1);
if (cr) {
/* finish off the last rectangle */
- cr->property_x2() = trackview.editor().frame_to_pixel (end - position);
+ cr->set_x1 (trackview.editor().sample_to_pixel (end - position));
}
if (frame_handle_start) {
frame_handle_start->raise_to_top ();
+ }
+
+ if (frame_handle_end) {
frame_handle_end->raise_to_top ();
}
+
+ if (name_highlight) {
+ name_highlight->raise_to_top ();
+ }
+
+ if (name_text) {
+ name_text->raise_to_top ();
+ }
+}
+
+bool
+RegionView::trim_front (framepos_t new_bound, bool no_overlap)
+{
+ if (_region->locked()) {
+ return false;
+ }
+
+ RouteTimeAxisView& rtv = dynamic_cast<RouteTimeAxisView&> (trackview);
+ double const speed = rtv.track()->speed ();
+
+ framepos_t const pre_trim_first_frame = _region->first_frame();
+
+ _region->trim_front ((framepos_t) (new_bound * speed));
+
+ if (no_overlap) {
+ // Get the next region on the left of this region and shrink/expand it.
+ boost::shared_ptr<Playlist> playlist (_region->playlist());
+ boost::shared_ptr<Region> region_left = playlist->find_next_region (pre_trim_first_frame, End, 0);
+
+ bool regions_touching = false;
+
+ if (region_left != 0 && (pre_trim_first_frame == region_left->last_frame() + 1)) {
+ regions_touching = true;
+ }
+
+ // Only trim region on the left if the first frame has gone beyond the left region's last frame.
+ if (region_left != 0 && (region_left->last_frame() > _region->first_frame() || regions_touching)) {
+ region_left->trim_end (_region->first_frame() - 1);
+ }
+ }
+
+ region_changed (ARDOUR::bounds_change);
+
+ return (pre_trim_first_frame != _region->first_frame()); //return true if we actually changed something
+}
+
+bool
+RegionView::trim_end (framepos_t new_bound, bool no_overlap)
+{
+ if (_region->locked()) {
+ return false;
+ }
+
+ RouteTimeAxisView& rtv = dynamic_cast<RouteTimeAxisView&> (trackview);
+ double const speed = rtv.track()->speed ();
+
+ framepos_t const pre_trim_last_frame = _region->last_frame();
+
+ _region->trim_end ((framepos_t) (new_bound * speed));
+
+ if (no_overlap) {
+ // Get the next region on the right of this region and shrink/expand it.
+ boost::shared_ptr<Playlist> playlist (_region->playlist());
+ boost::shared_ptr<Region> region_right = playlist->find_next_region (pre_trim_last_frame, Start, 1);
+
+ bool regions_touching = false;
+
+ if (region_right != 0 && (pre_trim_last_frame == region_right->first_frame() - 1)) {
+ regions_touching = true;
+ }
+
+ // Only trim region on the right if the last frame has gone beyond the right region's first frame.
+ if (region_right != 0 && (region_right->first_frame() < _region->last_frame() || regions_touching)) {
+ region_right->trim_front (_region->last_frame() + 1);
+ }
+
+ region_changed (ARDOUR::bounds_change);
+
+ } else {
+ region_changed (PropertyChange (ARDOUR::Properties::length));
+ }
+
+ return (pre_trim_last_frame != _region->last_frame()); //return true if we actually changed something
+}
+
+
+void
+RegionView::thaw_after_trim ()
+{
+ if (_region->locked()) {
+ return;
+ }
+
+ _region->resume_property_changes ();
+}
+
+
+void
+RegionView::move_contents (frameoffset_t distance)
+{
+ if (_region->locked()) {
+ return;
+ }
+ _region->move_start (distance);
+ region_changed (PropertyChange (ARDOUR::Properties::start));
+}
+
+/** Snap a frame offset within our region using the current snap settings.
+ * @param x Frame offset from this region's position.
+ * @return Snapped frame offset from this region's position.
+ */
+frameoffset_t
+RegionView::snap_frame_to_frame (frameoffset_t x) const
+{
+ PublicEditor& editor = trackview.editor();
+
+ /* x is region relative, convert it to global absolute frames */
+ framepos_t const session_frame = x + _region->position();
+
+ /* try a snap in either direction */
+ framepos_t frame = session_frame;
+ editor.snap_to (frame, 0);
+
+ /* if we went off the beginning of the region, snap forwards */
+ if (frame < _region->position ()) {
+ frame = session_frame;
+ editor.snap_to (frame, 1);
+ }
+
+ /* back to region relative */
+ return frame - _region->position();
}