Package Gnumed :: Package timelinelib :: Package wxgui :: Package components :: Package maincanvas :: Module scrollbase
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Source Code for Module Gnumed.timelinelib.wxgui.components.maincanvas.scrollbase

 1  # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018  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.wxgui.components.maincanvas.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, timeline_canvas):
32 InputHandler.__init__(self, timeline_canvas) 33 self.timer_running = False
34
35 - def mouse_moved(self, cursor, keyboard):
36 self.last_x = cursor.x 37 if self._in_scroll_zone(cursor.x) and not self.timer_running: 38 self.timeline_canvas.start_dragscroll_timer(milliseconds=DRAGSCROLL_TIMER_MSINTERVAL) 39 self.timer_running = True
40
41 - def left_mouse_up(self):
42 self.timeline_canvas.stop_dragscroll_timer()
43
44 - def dragscroll_timer_fired(self):
45 if self._in_scroll_zone(self.last_x): 46 if self.last_x < SCROLL_ZONE_WIDTH: 47 direction = 1 48 else: 49 direction = -1 50 self.timeline_canvas.Scroll(direction * 0.1) 51 self.view_scrolled()
52
53 - def view_scrolled(self):
54 raise Exception("view_scrolled not implemented in subclass.")
55
56 - def _in_scroll_zone(self, x):
57 """ 58 Return True if x is within the left hand or right hand area 59 where timed scrolling shall start/continue. 60 """ 61 width, _ = self.timeline_canvas.GetSizeTuple() 62 if width - x < SCROLL_ZONE_WIDTH or x < SCROLL_ZONE_WIDTH: 63 return True 64 return False
65