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