Package Gnumed :: Package timelinelib :: Package view :: Module scrollbase |
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# Source Code for Module Gnumed.timelinelib.view.scrollbase

     1  # Copyright (C) 2009, 2010, 2011  Rickard Lindberg, Roger Lindberg
     2  #
     3  # This file is part of Timeline.
     4  #
     5  # Timeline is free software: you can redistribute it and/or modify
     6  # it under the terms of the GNU General Public License as published by
     7  # the Free Software Foundation, either version 3 of the License, or
     8  # (at your option) any later version.
     9  #
    10  # Timeline is distributed in the hope that it will be useful,
    11  # but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13  # GNU General Public License for more details.
    14  #
    15  # You should have received a copy of the GNU General Public License
    16  # along with Timeline.  If not, see <http://www.gnu.org/licenses/>.
    17
    18
    19  from timelinelib.view.inputhandler import InputHandler
    20
    21
    22  # dragscroll timer interval in milliseconds
    23  DRAGSCROLL_TIMER_MSINTERVAL = 300
    24  # timeline. The scroll zone areas are found at the beginning and at the
    25  # end of the timeline.
    26  SCROLL_ZONE_WIDTH = 20
    27
    28
    29 -class ScrollViewInputHandler(InputHandler):
    30
    31 -    def __init__(self, controller):
    32          self.controller = controller
    33          self.view = controller.view
    34          self.timer_running = False
    35
    36 -    def mouse_moved(self, x, y, alt_down=False):
    37          self.last_x = x
    38          if self.controller._in_scroll_zone(x) and not self.timer_running:
    39              self.view.start_dragscroll_timer(milliseconds=DRAGSCROLL_TIMER_MSINTERVAL)
    40              self.timer_running = True
    41
    42 -    def left_mouse_up(self):
    43          self.view.stop_dragscroll_timer()
    44
    45 -    def dragscroll_timer_fired(self):
    46          if self.controller._in_scroll_zone(self.last_x):
    47              if self.last_x < SCROLL_ZONE_WIDTH:
    48                  direction = 1
    49              else:
    50                  direction = -1
    51              self.controller._scroll_timeline_view(direction)
    52              self.view_scrolled()
    53
    54 -    def view_scrolled(self):
    55          raise Exception("view_scrolled not implemented in subclass.")
    56