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# Copyright (C) 2009, 2010, 2011 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.db.objects import TimePeriod
from timelinelib.view.scrollbase import ScrollViewInputHandler
class SelectPeriodByDragInputHandler(ScrollViewInputHandler):
def __init__(self, controller, initial_time):
ScrollViewInputHandler.__init__(self, controller)
self.controller = controller
self.initial_time = initial_time
self.last_valid_time = initial_time
self.current_time = initial_time
def mouse_moved(self, x, y, alt_down=False):
ScrollViewInputHandler.mouse_moved(self, x, y, alt_down)
self._move_current_time()
def view_scrolled(self):
self._move_current_time()
def _move_current_time(self):
self.current_time = self.controller.get_time(self.last_x)
try:
period = self.get_current_period()
self.last_valid_time = self.current_time
except ValueError:
period = self.get_last_valid_period()
self.controller.view_properties.period_selection = (period.start_time, period.end_time)
self.controller._redraw_timeline()
def get_last_valid_period(self):
return self._get_period(self.initial_time, self.last_valid_time)
def get_current_period(self):
return self._get_period(self.initial_time, self.current_time)
def _get_period(self, t1, t2):
if t1 > t2:
start = t2
end = t1
else:
start = t1
end = t2
return TimePeriod(
self.controller.get_timeline().get_time_type(),
self.controller.get_drawer().snap(start),
self.controller.get_drawer().snap(end))
def left_mouse_up(self):
ScrollViewInputHandler.left_mouse_up(self)
self._end_action()
def _end_action(self):
self.end_action()
self._remove_selection()
self.controller.change_input_handler_to_no_op()
def _remove_selection(self):
self.controller.view_properties.period_selection = None
self.controller.redraw_timeline()
def end_action(self):
raise Exception("end_action not implemented in subclass.")
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