Source code for timelinelib.wxgui.components.maincanvas.movebydrag
# Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 Rickard Lindberg, Roger Lindberg
#
# This file is part of Timeline.
#
# Timeline 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 3 of the License, or
# (at your option) any later version.
#
# Timeline 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 Timeline. If not, see <http://www.gnu.org/licenses/>.
from timelinelib.wxgui.components.maincanvas.scrollbase import ScrollViewInputHandler
[docs]class MoveByDragInputHandler(ScrollViewInputHandler):
[docs] def __init__(self, state, timeline_canvas, event, start_drag_time):
ScrollViewInputHandler.__init__(self, timeline_canvas)
self._state = state
self.start_drag_time = start_drag_time
self._store_event_periods(event)
self._transaction = self.timeline_canvas.GetDb().transaction("Move events")
def _store_event_periods(self, event_being_dragged):
self.event_periods = []
selected_events = self.timeline_canvas.GetSelectedEvents()
if event_being_dragged not in selected_events:
return
for event in selected_events:
period_pair = (event, event.get_time_period())
if event == event_being_dragged:
self.event_periods.insert(0, period_pair)
else:
self.event_periods.append(period_pair)
if event.is_container():
for subevent in event.subevents:
period_pair = (subevent, subevent.get_time_period())
self.event_periods.append(period_pair)
assert self.event_periods[0][0] == event_being_dragged
[docs] def mouse_moved(self, cursor, keyboard):
ScrollViewInputHandler.mouse_moved(self, cursor, keyboard)
self._move_event()
[docs] def left_mouse_up(self):
ScrollViewInputHandler.left_mouse_up(self)
self._state.display_status("")
self._transaction.commit()
self._state.edit_ends()
self._state.change_to_no_op()
def _move_event(self):
if len(self.event_periods) == 0:
return
if self._any_event_locked():
self._state.display_status(_("Can't move locked event"))
return
self._move_selected_events()
self.timeline_canvas.Redraw()
def _any_event_locked(self):
for (event, _) in self.event_periods:
if event.get_locked():
return True
return False
def _move_selected_events(self):
try:
total_move_delta = self._get_total_move_delta()
for (event, original_period) in self.event_periods:
event.update_period_o(original_period.move_delta(total_move_delta))
event.save()
except ValueError as ex:
self.status_bar.set_text("%s" % ex)
def _get_total_move_delta(self):
moved_delta = self._get_moved_delta()
if self.timeline_canvas.EventIsPeriod(self.event_periods[0][0]):
new_period = self.event_periods[0][1].move_delta(moved_delta)
snapped_period = self._snap(new_period)
return snapped_period.start_time - self.event_periods[0][1].start_time
else:
return moved_delta
def _get_moved_delta(self):
current_time = self.timeline_canvas.GetTimeAt(self.last_x)
return current_time - self.start_drag_time
def _snap(self, period):
start = period.start_time
end = period.end_time
start_snapped = self.timeline_canvas.Snap(start)
end_snapped = self.timeline_canvas.Snap(end)
if start_snapped != start:
return period.move_delta(start_snapped - start)
elif end_snapped != end:
return period.move_delta(end_snapped - end)
else:
return period