def _get_selection_data(self,  p1, p2):
        x1, y1 = p1
        x2, y2 = p2
        
        if x1 > x2:
            x1, x2 = x2, x1
        if y1 > y2:
            y1, y2 = y2, y1
        
        start_frame = tlinewidgets.get_frame(x1)
        end_frame = tlinewidgets.get_frame(x2) 
        
        track_top_index = self.get_bounding_track_index(y1, tlinewidgets.get_track(y1))
        track_bottom_index = self.get_bounding_track_index(y2, tlinewidgets.get_track(y2))

        self.topleft_track = track_top_index - 1

        # Get compositors
        for i in range(track_bottom_index + 1, track_top_index):
            track_compositors = current_sequence().get_track_compositors(i)
            for comp in track_compositors:
                if comp.clip_in >= start_frame and comp.clip_out < end_frame:
                    self.selected_compositors.append(comp)
        
        # Get BoxTrackSelection objects
        for i in range(track_bottom_index + 1, track_top_index):
            self.track_selections.append(BoxTrackSelection(i, start_frame, end_frame))

        # Drop empty tracks from bottom up
        while len(self.track_selections) > 0:
            if self.track_selections[0].is_empty() == True:
                self.track_selections.pop(0)
            else:
                track_bottom_index = self.track_selections[0].track_id
                break
                
        # Drop empty tracks from top down
        while len(self.track_selections) > 0:
            if self.track_selections[-1].is_empty() == True:
                self.track_selections.pop(-1)
            else:
                self.topleft_track = self.track_selections[-1].track_id
                break

        self.height_tracks = self.topleft_track - track_bottom_index + 1# self.topleft_track is inclusive to height, track_bottom_index is eclusive to height
        
        # Get selection bounding box
        self.topleft_frame = 1000000000000
        for track_selection in self.track_selections:
            if track_selection.range_frame_in != -1:
                if track_selection.range_frame_in < self.topleft_frame:
                    self.topleft_frame = track_selection.range_frame_in
                
        last_frame = 0
        for track_selection in self.track_selections:
            if track_selection.range_frame_out != -1:
                if track_selection.range_frame_out > last_frame:
                    last_frame = track_selection.range_frame_out
        
        self.width_frames = last_frame - self.topleft_frame

def oneroll_trim_press(event, frame):
    """
    User presses mouse when in one roll mode.
    """
    global mouse_disabled, submode

    if not _pressed_on_edited_track(event.y):
        track = tlinewidgets.get_track(event.y)
        success = set_oneroll_mode(track, frame)
        if not success:
            if editorpersistance.prefs.empty_click_exits_trims == True:
                set_exit_mode_func(True) # further mouse events are handled at editevent.py
            else:
                set_no_edit_mode_func() # further mouse events are handled at editevent.py
        else:
            submode = MOUSE_EDIT_ON # to stop entering keyboard edits until mouse released
            if not editorpersistance.prefs.quick_enter_trims:
                # new trim inited, editing non-active until release
                tlinewidgets.trim_mode_in_non_active_state = True
                gui.tline_canvas.widget.queue_draw()
                gui.editor_window.set_tline_cursor(editorstate.ONE_ROLL_TRIM_NO_EDIT)
                mouse_disabled = True
            else:
                # new trim inited, active immediately
                oneroll_trim_move(event.x, event.y, frame, None)
                gui.tline_canvas.widget.queue_draw()
        return
        
    if not _pressed_on_one_roll_active_area(frame):
        track = tlinewidgets.get_track(event.y)
        success = set_oneroll_mode(track, frame)
        if not success:
            if editorpersistance.prefs.empty_click_exits_trims == True:
                set_exit_mode_func(True) # further mouse events are handled at editevent.py
            else:
                set_no_edit_mode_func() # no furter mouse events will come here
        else:
            submode = MOUSE_EDIT_ON # to stop entering keyboard edits until mouse released
            if not editorpersistance.prefs.quick_enter_trims:
                # new trim inited, editing non-active until release
                tlinewidgets.trim_mode_in_non_active_state = True
                gui.tline_canvas.widget.queue_draw()
                gui.editor_window.set_tline_cursor(editorstate.ONE_ROLL_TRIM_NO_EDIT)
                mouse_disabled = True
            else:
                # new trim inited, active immediately
                oneroll_trim_move(event.x, event.y, frame, None)
                gui.tline_canvas.widget.queue_draw()
        return

    # Get legal edit delta and set to edit mode data for overlay draw
    global edit_data
    frame = _legalize_one_roll_trim(frame, edit_data["trim_limits"])
    edit_data["selected_frame"] = frame

    PLAYER().seek_frame(frame)

def display_clip_menu(y, event, frame):
    # See if we actually hit a clip
    track = tlinewidgets.get_track(y)
    if track == None:
        return False
    clip_index = current_sequence().get_clip_index(track, frame)
    if clip_index == -1:
        return False
    # Can't do anything to clips in locked tracks
    if editevent.track_lock_check_and_user_info(track, display_clip_menu, "clip context menu"):
        return False
    
    # Display popup
    pressed_clip = track.clips[clip_index]
    if pressed_clip.is_blanck_clip == False:
        movemodes.select_clip(track.id, clip_index)
    else:
        movemodes.select_blank_range(track, pressed_clip)

    if track.type == appconsts.VIDEO:
        guicomponents.display_clip_popup_menu(event, pressed_clip, \
                                              track, _clip_menu_item_activated)
    elif track.type == appconsts.AUDIO:
        guicomponents.display_audio_clip_popup_menu(event, pressed_clip, \
                                                    track, _clip_menu_item_activated)

    return True

def tline_canvas_double_click(frame, x, y):
    if PLAYER().looping():
        return
    elif PLAYER().is_playing():
        PLAYER().stop_playback()

    if not timeline_visible():
        updater.display_sequence_in_monitor()
        set_default_edit_mode()
        return

    hit_compositor = tlinewidgets.compositor_hit(frame, y, current_sequence().compositors)
    if hit_compositor != None:
        compositeeditor.set_compositor(hit_compositor)
        return

    track = tlinewidgets.get_track(y)
    if track == None:
        return
    clip_index = current_sequence().get_clip_index(track, frame)
    if clip_index == -1:
        return

    clip = track.clips[clip_index]
    data = (clip, track, None, x)
    updater.open_clip_in_effects_editor(data)

def _move_mode_move(frame, x, y):
    """
    Updates edit data needed for doing edit and drawing overlay 
    based on mouse movement.
    """
    global edit_data

    # Get frame that is the one where insert is attempted
    press_frame = edit_data["press_frame"]
    first_clip_start = edit_data["first_clip_start"]
    attempt_insert_frame = first_clip_start + (frame - press_frame)
    edit_data["attempt_insert_frame"] = attempt_insert_frame    
    
    # Get track where insert is attempted. Track selection forced into range of editable tracks.
    to_track = tlinewidgets.get_track(y)
    if to_track == None:
        if y > tlinewidgets.REF_LINE_Y:
            to_track = get_track(1)
        else:
            to_track = get_track(len(current_sequence().tracks) - 2)
    if to_track.id < 1:
        to_track = get_track(1)
    if to_track.id > len(current_sequence().tracks) - 2:
        to_track = get_track(len(current_sequence().tracks) - 2)
    edit_data["to_track_object"] = to_track

    # Get index for insert in target track
    insert_index = to_track.get_clip_index_at(attempt_insert_frame)
    edit_data["insert_index"] = insert_index
    edit_data["insert_frame"] = to_track.clip_start(insert_index)
    
    _set_current_move_frame_and_check_move_start(frame, x, y)

def mouse_press(event, frame):

    x = event.x
    y = event.y

    # If we have clip being edited and its edit area is hit, we do not need to init data.
    if _clip_is_being_edited() and _clip_edit_area_hit(x, y):
        return
    
    # Get pressed track
    track = tlinewidgets.get_track(y)  

    # Selecting empty clears selection
    if track == None:
        #clear_selected_clips()
        #pressed_on_selected = False
        _set_no_clip_edit_data()
        updater.repaint_tline()
        return    
    
    # Get pressed clip index
    clip_index = current_sequence().get_clip_index(track, frame)

    # Selecting empty clears selection
    if clip_index == -1:
        #clear_selected_clips()
        #pressed_on_selected = False
        _set_no_clip_edit_data()
        updater.repaint_tline()
        return

    clip = track.clips[clip_index]
    
    # Save data needed to do the keyframe edits.
    global edit_data #, pressed_on_selected, drag_disabled
    edit_data = {"draw_function":_tline_overlay,
                 "clip_index":clip_index,
                 "clip":clip,
                 "track":track,
                 "mouse_start_x":x,
                 "mouse_start_y":y}


    # Init for volume editing if volume filter available
    for i in range(0, len(clip.filters)):
        filter_object = clip.filters[i]
        if filter_object.info.mlt_service_id == "volume":
            editable_properties = propertyedit.get_filter_editable_properties(
                                                           clip, 
                                                           filter_object,
                                                           i,
                                                           track,
                                                           clip_index)
            for ep in editable_properties:
                if ep.name == "gain":
                    _init_for_editable_property(ep)
            
    tlinewidgets.set_edit_mode_data(edit_data)
    updater.repaint_tline()

def track_center_pressed(data):
    if data.event.button == 1:
        # handle possible mute icon presses
        press_x = data.event.x
        press_y = data.event.y
        track = tlinewidgets.get_track(press_y)
        if track == None:
            return
        y_off = press_y - tlinewidgets._get_track_y(track.id)
        ICON_WIDTH = 12
        if press_x > tlinewidgets.COLUMN_LEFT_PAD and press_x < tlinewidgets.COLUMN_LEFT_PAD + ICON_WIDTH:
            # Mute icon x area hit
            ix, iy = tlinewidgets.MUTE_ICON_POS
            if track.height > appconsts.TRACK_HEIGHT_SMALL:
                ix, iy = tlinewidgets.MUTE_ICON_POS_NORMAL
            ICON_HEIGHT = 10
            if track.id >= current_sequence().first_video_index:
                # Video tracks
                # Test mute switches
                if y_off > iy and y_off < iy + ICON_HEIGHT:
                    # Video mute icon hit
                    if track.mute_state == appconsts.TRACK_MUTE_NOTHING:
                        new_mute_state = appconsts.TRACK_MUTE_VIDEO
                    elif track.mute_state == appconsts.TRACK_MUTE_VIDEO:
                        new_mute_state = appconsts.TRACK_MUTE_NOTHING
                    elif track.mute_state == appconsts.TRACK_MUTE_AUDIO:
                        new_mute_state = appconsts.TRACK_MUTE_ALL
                    elif track.mute_state == appconsts.TRACK_MUTE_ALL:
                        new_mute_state = appconsts.TRACK_MUTE_AUDIO
                elif y_off > iy + ICON_HEIGHT and y_off < iy + ICON_HEIGHT * 2:
                    # Audio mute icon hit
                    if track.mute_state == appconsts.TRACK_MUTE_NOTHING:
                        new_mute_state = appconsts.TRACK_MUTE_AUDIO
                    elif track.mute_state == appconsts.TRACK_MUTE_VIDEO:
                        new_mute_state = appconsts.TRACK_MUTE_ALL
                    elif track.mute_state == appconsts.TRACK_MUTE_AUDIO:
                        new_mute_state = appconsts.TRACK_MUTE_NOTHING
                    elif track.mute_state == appconsts.TRACK_MUTE_ALL:
                        new_mute_state = appconsts.TRACK_MUTE_VIDEO
                else:
                    return
            else:
                # Audio tracks
                # Test mute switches
                iy = iy + 6 # Mute icon is lower on audio tracks
                if y_off > iy and y_off < iy + ICON_HEIGHT:
                    if track.mute_state == appconsts.TRACK_MUTE_VIDEO:
                        new_mute_state = appconsts.TRACK_MUTE_ALL
                    else:
                        new_mute_state = appconsts.TRACK_MUTE_VIDEO
                else:
                    return 
            # Update track mute state
            current_sequence().set_track_mute_state(track.id, new_mute_state)
            gui.tline_column.widget.queue_draw()
    
    if data.event.button == 3:
        guicomponents.display_tracks_popup_menu(data.event, data.track, \
                                                _track_menu_item_activated)

def tline_media_drop(media_file, x, y, use_marks=False):
    track = tlinewidgets.get_track(y)
    if track == None:
        return
    if track.id < 1 or track.id >= (len(current_sequence().tracks) - 1):
        return 
    if dialogutils.track_lock_check_and_user_info(track):
        #modesetting.set_default_edit_mode()
        # TODO: Info
        return
        
    modesetting.stop_looping()

    frame = tlinewidgets.get_frame(x)
    
    # Create new clip.
    if media_file.type != appconsts.PATTERN_PRODUCER:
        new_clip = current_sequence().create_file_producer_clip(media_file.path, media_file.name, False, media_file.ttl)
    else:
        new_clip = current_sequence().create_pattern_producer(media_file)

    # Set clip in and out
    if use_marks == False:
        new_clip.mark_in = 0
        new_clip.mark_out = new_clip.get_length() - 1 # - 1 because out is mark_out inclusive

        if media_file.type == appconsts.IMAGE_SEQUENCE:
            new_clip.mark_out = media_file.length
    else:
        new_clip.mark_in = media_file.mark_in
        new_clip.mark_out =  media_file.mark_out

        if new_clip.mark_in == -1:
            new_clip.mark_in = 0
        if new_clip.mark_out == -1:
            new_clip.mark_out = new_clip.get_length() - 1 # - 1 because out is mark_out inclusive
            if media_file.type == appconsts.IMAGE_SEQUENCE:
                new_clip.mark_out = media_file.length

    # Graphics files get added with their default lengths
    f_name, ext = os.path.splitext(media_file.name)
    if utils.file_extension_is_graphics_file(ext) and media_file.type != appconsts.IMAGE_SEQUENCE: # image sequences are graphics files but have own length
        in_fr, out_fr, l = editorpersistance.get_graphics_default_in_out_length()
        new_clip.mark_in = in_fr
        new_clip.mark_out = out_fr

    # Non-insert DND actions
    if editorpersistance.prefs.dnd_action == appconsts.DND_OVERWRITE_NON_V1:
        if track.id != current_sequence().first_video_track().id:
            drop_done = _attempt_dnd_overwrite(track, new_clip, frame)
            if drop_done == True:
                return
    elif editorpersistance.prefs.dnd_action == appconsts.DND_ALWAYS_OVERWRITE:
        drop_done = _attempt_dnd_overwrite(track, new_clip, frame)
        if drop_done == True:
            return
            
    do_clip_insert(track, new_clip, frame)

def maybe_init_for_mouse_press(event, frame):
    # See if we actually hit a clip
    track = tlinewidgets.get_track(event.y)
    if track == None:
        return
    if track.id < 1 or (track.id >= len(current_sequence().tracks) - 1):
        return False
    clip_index = current_sequence().get_clip_index(track, frame)
    if clip_index == -1:
        return

    clip = track.clips[clip_index]

    if clip.is_blanck_clip:
        return

    # Now we will in fact enter CLIP_END_DRAG edit mode
    # See if we're dragging clip end or start
    cut_frame = current_sequence().get_closest_cut_frame(track.id, frame)
    editing_clip_end = True
    if frame >= cut_frame:
        editing_clip_end = False
    else:
        cut_frame = cut_frame - (clip.clip_out - clip.clip_in)

    if editing_clip_end == True:  # clip end drags
        bound_end = (
            cut_frame - clip.clip_in + clip.get_length() - 1
        )  # get_length() is available media length, not current clip length
        bound_start = cut_frame - 1
        if clip_index == len(track.clips) - 1:  # last clip
            bound_end = bound_end - 1
    else:  # clip beginning drags
        bound_start = cut_frame - clip.clip_in
        bound_end = cut_frame + (clip.clip_out - clip.clip_in) + 1

    global _enter_mode, _enter_draw_func, _edit_data

    _enter_mode = editorstate.edit_mode
    editorstate.edit_mode = editorstate.CLIP_END_DRAG

    _enter_draw_func = tlinewidgets.canvas_widget.edit_mode_overlay_draw_func

    _edit_data = {}
    _edit_data["track"] = track
    _edit_data["clip_index"] = clip_index
    _edit_data["frame"] = frame
    _edit_data["press_frame"] = frame
    _edit_data["editing_clip_end"] = editing_clip_end
    _edit_data["bound_end"] = bound_end
    _edit_data["bound_start"] = bound_start
    _edit_data["track_height"] = track.height
    _edit_data["orig_in"] = cut_frame - 1
    _edit_data["orig_out"] = cut_frame + (clip.clip_out - clip.clip_in)

    tlinewidgets.set_edit_mode(_edit_data, tlinewidgets.draw_clip_end_drag_overlay)

    gui.editor_window.set_cursor_to_mode()

    def is_hit(self, x, y):
        hit_frame = tlinewidgets.get_frame(x)
        hit_track = tlinewidgets.get_track(y).id

        if ((hit_frame >= self.topleft_frame and hit_frame < self.topleft_frame + self.width_frames) and
            (hit_track <= self.topleft_track and hit_track > self.topleft_track - self.height_tracks)):
                return True
                
        return False

def cut_single_track(event, frame):
    track = tlinewidgets.get_track(event.y)
    data = get_cut_data(track, frame)
    if data == None:
        return

    action = edit.cut_action(data)
    action.do_edit()

    updater.repaint_tline()

def mouse_press(event, frame):
    x = event.x
    y = event.y

    global edit_data, mouse_disabled

    # Clear edit data in gui module
    edit_data = None
    mouse_disabled = False
    tlinewidgets.set_edit_mode_data(edit_data)

    # Get pressed track
    track = tlinewidgets.get_track(y)  
    if track == None:
        mouse_disabled = True
        return

    if dialogutils.track_lock_check_and_user_info(track):
        mouse_disabled = True
        return

    # Get pressed clip index
    clip_index = current_sequence().get_clip_index(track, frame)

    # Selecting empty or blank clip does not define edit
    if clip_index == -1:
        mouse_disabled = True
        return
    pressed_clip = track.clips[clip_index]
    if pressed_clip.is_blanck_clip:
        mouse_disabled = True
        return

    if (event.get_state() & Gdk.ModifierType.CONTROL_MASK):
        move_all = False
    else:
        move_all = True

    first_moved_frame = track.clip_start(clip_index)
    multi_data = MultimoveData(track, first_moved_frame, move_all)
    
    edit_data = {"track_id":track.id,
                 "press_frame":frame,
                 "current_frame":frame,
                 "first_moved_frame":first_moved_frame,
                 "mouse_start_x":x,
                 "mouse_start_y":y,
                 "multi_data":multi_data}

    tlinewidgets.set_edit_mode_data(edit_data)
    updater.repaint_tline()

def tline_range_item_drop(rows, x, y):
    track = tlinewidgets.get_track(y)
    if track == None:
        return
    if track.id < 1 or track.id >= (len(current_sequence().tracks) - 1):
        return 
    if track_lock_check_and_user_info(track):
        set_default_edit_mode()
        return
        
    frame = tlinewidgets.get_frame(x)
    clips = medialog.get_clips_for_rows(rows)
    set_default_edit_mode()
    do_multiple_clip_insert(track, clips, frame)

def cut_single_track(event, frame):
    track = tlinewidgets.get_track(event.y)
    if track == None or track.id == 0 or track.id == len(current_sequence().tracks) - 1:
        return

    if dialogutils.track_lock_check_and_user_info(track):
        return
        
    data = get_cut_data(track, frame)
    if data == None:
        return

    action = edit.cut_action(data)
    action.do_edit()

    updater.repaint_tline()

def _set_sync_parent_clip(event, frame):
    child_clip, child_index, child_clip_track = parent_selection_data
    parent_track = tlinewidgets.get_track(event.y)

    if parent_track != current_sequence().tracks[current_sequence().first_video_index]:
        dialogutils.warning_message(
            _("Sync parent clips must be on track V1"),
            _("Selected sync parent clip is on track ")
            + utils.get_track_name(parent_track, current_sequence())
            + _(".\nYou can only sync to clips that are on track V1."),
            gui.editor_window.window,
            True,
        )
        return

    # this can't have parent clip already
    if child_clip.sync_data != None:
        return

    if parent_track == None:
        return
    parent_clip_index = current_sequence().get_clip_index(parent_track, frame)
    if parent_clip_index == -1:
        return

    # Parent and child can't be on the same track.
    # Now that all parent clips must be on track V1 this is no longer shoild be possible.
    if parent_track == child_clip_track:
        print "parent_track == child_clip_track"
        return

    parent_clip = parent_track.clips[parent_clip_index]

    # These cannot be chained.
    # Now that all parent clips must be on track V1 this is no longer shoild be possible.
    if parent_clip.sync_data != None:
        print "parent_clip.sync_data != None"
        return

    data = {
        "child_index": child_index,
        "child_track": child_clip_track,
        "parent_index": parent_clip_index,
        "parent_track": parent_track,
    }
    action = edit.set_sync_action(data)
    action.do_edit()

def tline_media_drop(media_file, x, y, use_marks=False):
    track = tlinewidgets.get_track(y)
    if track == None:
        return
    if track.id < 1 or track.id >= (len(current_sequence().tracks) - 1):
        return 
    if track_lock_check_and_user_info(track):
        set_default_edit_mode()
        return

    set_default_edit_mode()

    frame = tlinewidgets.get_frame(x)
    
    # Create new clip.
    if media_file.type != appconsts.PATTERN_PRODUCER:
        new_clip = current_sequence().create_file_producer_clip(media_file.path, media_file.name)
    else:
        new_clip = current_sequence().create_pattern_producer(media_file)

    # Set clip in and out
    if use_marks == False:
        new_clip.mark_in = 0
        new_clip.mark_out = new_clip.get_length() - 1 # - 1 because out is mark_out inclusive

        if media_file.type == appconsts.IMAGE_SEQUENCE:
            new_clip.mark_out = media_file.length
    else:
        new_clip.mark_in = media_file.mark_in
        new_clip.mark_out =  media_file.mark_out

        if new_clip.mark_in == -1:
            new_clip.mark_in = 0
        if new_clip.mark_out == -1:
            new_clip.mark_out = new_clip.get_length() - 1 # - 1 because out is mark_out inclusive
            if media_file.type == appconsts.IMAGE_SEQUENCE:
                new_clip.mark_out = media_file.length

    # Graphics files get added with their default lengths
    f_name, ext = os.path.splitext(media_file.name)
    if utils.file_extension_is_graphics_file(ext) and media_file.type != appconsts.IMAGE_SEQUENCE: # image sequences are graphics files but have own length
        in_fr, out_fr, l = editorpersistance.get_graphics_default_in_out_length()
        new_clip.mark_in = in_fr
        new_clip.mark_out = out_fr
            
    do_clip_insert(track, new_clip, frame)

def _get_sync_tline_clip(event, frame):
    sync_track = tlinewidgets.get_track(event.y)

    if sync_track == None:
        return None
        
    if sync_track == _tline_sync_data.origin_track:
        dialogutils.warning_message(_("Audio Sync parent clips must be on differnt tracks "), 
                                _("Selected audio sync clip is on the sametrack as the sync action origin clip."),
                                gui.editor_window.window,
                                True)
        return None

    sync_clip_index = current_sequence().get_clip_index(sync_track, frame)
    if sync_clip_index == -1:
        return None

    return sync_track.clips[sync_clip_index]

def slide_trim_mode_init(x, y):
    """
    User selects two roll mode
    """
    track = tlinewidgets.get_track(y)
    if track == None:
        return False

    stop_looping()
    editorstate.edit_mode = editorstate.SLIDE_TRIM

    movemodes.clear_selected_clips() # Entering trim edit mode clears selection 
    updater.set_trim_mode_gui()

    press_frame = tlinewidgets.get_frame(x)
    trimmodes.set_exit_mode_func = set_default_edit_mode
    trimmodes.set_no_edit_mode_func = slide_trim_no_edit_init
    success = trimmodes.set_slide_mode(track, press_frame)
    return success

def select_sync_clip_mouse_pressed(event, frame):
    sync_clip = _get_sync_tline_clip(event, frame)

    if sync_clip == None:
        return # selection wasn't good
    
    if utils.is_mlt_xml_file(sync_clip.path) == True:
        # This isn't translated because 1.14 translation window is close, translation coming for 1.16
        dialogutils.warning_message(_("Cannot Timeline Audio Sync with Compound Clips!"), 
                                    _("Audio syncing for Compound Clips is not supported."),
                                    gui.editor_window.window,
                                    True)
        return

    sync_track =  tlinewidgets.get_track(event.y)
    sync_clip_index = sync_track.clips.index(sync_clip)

    _tline_sync_data.sync_clip = sync_clip
    _tline_sync_data.sync_track = sync_track
    _tline_sync_data.sync_clip_index = sync_clip_index

    # TImeline media offset for clips
    sync_clip_start_in_tline = sync_track.clip_start(sync_clip_index)
    _tline_sync_data.origin_clip_start_in_tline = _tline_sync_data.origin_track.clip_start(_tline_sync_data.origin_clip_index)
    
    _tline_sync_data.clip_tline_media_offset = (sync_clip_start_in_tline - sync_clip.clip_in) - (_tline_sync_data.origin_clip_start_in_tline - _tline_sync_data.origin_clip.clip_in)
    
    gdk_window = gui.tline_display.get_parent_window();
    gdk_window.set_cursor(Gdk.Cursor.new(Gdk.CursorType.LEFT_PTR))
    
    global _compare_dialog_thread
    _compare_dialog_thread = AudioCompareActiveThread()
    _compare_dialog_thread.start()
    
    # This or GUI freezes, we really can't do Popen.wait() in a Gtk thread
    clapperless_thread = ClapperlesLaunchThread(_tline_sync_data.origin_clip.path, sync_clip.path, _tline_sync_offsets_computed_callback)
    clapperless_thread.start()

    # Edit consumes selection
    movemodes.clear_selected_clips()

    updater.repaint_tline()

def oneroll_trim_mode_init(x, y):
    """
    User enters ONE_ROLL_TRIM mode from ONE_ROLL_TRIM_NO_EDIT 
    """
    track = tlinewidgets.get_track(y)
    if track == None:
        return False

    stop_looping() 
    editorstate.edit_mode = editorstate.ONE_ROLL_TRIM

    movemodes.clear_selected_clips() # Entering trim edit mode clears selection 
    updater.set_trim_mode_gui()

    # init mode
    press_frame = tlinewidgets.get_frame(x)
    trimmodes.set_exit_mode_func = set_default_edit_mode
    trimmodes.set_no_edit_mode_func = oneroll_trim_no_edit_init
    success = trimmodes.set_oneroll_mode(track, press_frame)
    return success