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Viewing changes to examples/canvas/mp_viewport_pan_tool.py

  • Committer: Bazaar Package Importer
  • Author(s): Varun Hiremath
  • Date: 2008-12-29 02:34:05 UTC
  • Revision ID: james.westby@ubuntu.com-20081229023405-x7i4kp9mdxzmdnvu
Tags: upstream-3.0.1
Import upstream version 3.0.1

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examples/canvas/mp_viewport_pan_tool.py
 
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from enthought.traits.api import Int, Tuple
 
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from enthought.enable.tools.api import ViewportPanTool
 
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class MPViewportPanTool(ViewportPanTool):
 
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    cur_bid = Int(-1)
 
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    _last_blob_pos = Tuple
 
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    def normal_blob_down(self, event):
 
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        if self.cur_bid == -1 and self.is_draggable(event.x, event.y):
 
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            self.cur_bid = event.bid
 
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            self.drag_start(event)
 
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    def dragging_blob_up(self, event):
 
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        if event.bid == self.cur_bid:
 
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            self.cur_bid = -1
 
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            self.drag_end(event)
 
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    def dragging_blob_move(self, event):
 
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        if event.bid == self.cur_bid:
 
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            self._last_blob_pos = (event.x, event.y)
 
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            self.dragging(event)
 
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    def drag_start(self, event):
 
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        if self.component:
 
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            self.original_padding = self.component.padding
 
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            if hasattr(event, "bid"):
 
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                event.window.capture_blob(self, event.bid,
 
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                                          event.net_transform())
 
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            else:
 
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                event.window.set_mouse_owner(self, event.net_transform())
 
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            self._last_blob_pos = (event.x, event.y)
 
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            self.mouse_down_position = (event.x,event.y)
 
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            self.event_state = "dragging"
 
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            event.handled = True
 
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            ViewportPanTool.drag_start(self, event)
 
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        return
 
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    def drag_end(self, event):
 
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        event.x, event.y = self._last_blob_pos
 
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        if hasattr(event, "bid"):
 
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            event.window.release_blob(event.bid)
 
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        self.event_state = "normal"
 
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        ViewportPanTool.drag_end(self, event)
 
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