Source code for timelinelib.wxgui.components.maincanvas.scrollbase
# 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.inputhandler import InputHandler
# dragscroll timer interval in milliseconds
DRAGSCROLL_TIMER_MSINTERVAL = 300
# timeline. The scroll zone areas are found at the beginning and at the
# end of the timeline.
SCROLL_ZONE_WIDTH = 20
[docs]class ScrollViewInputHandler(InputHandler):
[docs] def __init__(self, timeline_canvas):
InputHandler.__init__(self, timeline_canvas)
self.timer_running = False
[docs] def mouse_moved(self, cursor, keyboard):
self.last_x = cursor.x
if self._in_scroll_zone(cursor.x) and not self.timer_running:
self.timeline_canvas.start_dragscroll_timer(milliseconds=DRAGSCROLL_TIMER_MSINTERVAL)
self.timer_running = True
[docs] def dragscroll_timer_fired(self):
if self._in_scroll_zone(self.last_x):
if self.last_x < SCROLL_ZONE_WIDTH:
direction = 1
else:
direction = -1
self.timeline_canvas.Scroll(direction * 0.1)
self.view_scrolled()
def _in_scroll_zone(self, x):
"""
Return True if x is within the left hand or right hand area
where timed scrolling shall start/continue.
"""
width, _ = self.timeline_canvas.GetSize()
if width - x < SCROLL_ZONE_WIDTH or x < SCROLL_ZONE_WIDTH:
return True
return False