+++ /dev/null
-#-----------------------------------------------------------------------------
-# Name: dragscroller.py
-# Purpose: Scrolls a wx.ScrollWindow by dragging
-#
-# Author: Riaan Booysen
-#
-# Created: 2006/09/05
-# Copyright: (c) 2006
-# Licence: wxPython
-#-----------------------------------------------------------------------------
-
-import wx
-
-class DragScroller:
- """ Scrolls a wx.ScrollWindow in the direction and speed of a mouse drag.
-
- Call Start with the position of the drag start.
- Call Stop on the drag release. """
-
- def __init__(self, scrollwin, rate=30, sensitivity=0.75):
- self.scrollwin = scrollwin
- self.rate = rate
- self.sensitivity = sensitivity
-
- self.pos = None
- self.timer = None
-
- def GetScrollWindow(self):
- return self.scrollwin
- def SetScrollWindow(self, scrollwin):
- self.scrollwin = scrollwin
-
- def GetUpdateRate(self):
- return self.rate
- def SetUpdateRate(self, rate):
- self.rate = rate
-
- def GetSensitivity(self):
- return self.sensitivity
- def SetSensitivity(self, sensitivity):
- self.sensitivity = sensitivity
-
- def Start(self, pos):
- """ Start a drag scroll operation """
- if not self.scrollwin:
- raise Exception, 'No ScrollWindow defined'
-
- self.pos = pos
- self.scrollwin.SetCursor(wx.StockCursor(wx.CURSOR_SIZING))
- self.scrollwin.CaptureMouse()
-
- self.timer = wx.Timer(self.scrollwin)
- self.scrollwin.Bind(wx.EVT_TIMER, self.OnTimerDoScroll, id=self.timer.GetId())
- self.timer.Start(self.rate)
-
- def Stop(self):
- """ Stops a drag scroll operation """
- if self.timer and self.scrollwin:
- self.timer.Stop()
- self.scrollwin.Disconnect(self.timer.GetId())
- self.timer.Destroy()
- self.timer = None
-
- self.scrollwin.SetCursor(wx.STANDARD_CURSOR)
- self.scrollwin.ReleaseMouse()
-
- def OnTimerDoScroll(self, event):
- if self.pos is None or not self.timer or not self.scrollwin:
- return
-
- new = self.scrollwin.ScreenToClient(wx.GetMousePosition())
- dx = int((new.x-self.pos.x)*self.sensitivity)
- dy = int((new.y-self.pos.y)*self.sensitivity)
- spx = self.scrollwin.GetScrollPos(wx.HORIZONTAL)
- spy = self.scrollwin.GetScrollPos(wx.VERTICAL)
-
- self.scrollwin.Scroll(spx+dx, spy+dy)