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Viewing changes to elisa-plugins/elisa/plugins/pigment/windows_messages_handler.py

  • Committer: pancake
  • Date: 2009-03-27 12:16:38 UTC
  • mfrom: (1115.2.37 elisa)
  • Revision ID: pancake@flubox-20090327121638-2da0c1a0zu3byufd
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elisa-plugins/elisa/plugins/pigment/windows_messages_handler.py
 
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# -*- coding: utf-8 -*-
 
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# Elisa - Home multimedia server
 
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# Copyright (C) 2006-2009 Fluendo Embedded S.L. (www.fluendo.com).
 
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# All rights reserved.
 
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#
 
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# This file is available under one of two license agreements.
 
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#
 
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# This file is licensed under the GPL version 3.
 
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# See "LICENSE.GPL" in the root of this distribution including a special
 
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# exception to use Elisa with Fluendo's plugins.
 
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#
 
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# The GPL part of Elisa is also available under a commercial licensing
 
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# agreement from Fluendo.
 
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# See "LICENSE.Elisa" in the root directory of this distribution package
 
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# for details on that license.
 
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from elisa.core import log
 
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class WindowsMessagesHandler(log.Loggable):
 
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    def __init__(self, viewport):
 
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        super(WindowsMessagesHandler, self).__init__()
 
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        self.viewport = viewport
 
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        self._signal_id = self.viewport.connect("win32-message-event",
 
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                                                self._on_windows_message)
 
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        self._wndprocs = {}
 
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    def add_wndproc(self, signal_id, callback):
 
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        """
 
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        Add a new window proc handler to the viewport windows messages handler.
 
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        @param signal_id: windows signal ID
 
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        @type signal_id: C{int}
 
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        @param callback: callable(viewport, event) to call when signal is
 
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                         received by the viewport
 
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        @type callback: C{callable}
 
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        """
 
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        msg_filter = self.viewport.get_message_filter()
 
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        if signal_id in msg_filter:
 
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            raise ValueError("Signal already handled")
 
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        self._wndprocs[signal_id] = callback
 
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        msg_filter.append(signal_id)
 
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        self.viewport.set_message_filter(msg_filter)
 
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    def remove_wndproc(self, signal_id):
 
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        """
 
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        Remove a window proc handler from the viewport windows messages handler.
 
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        @param signal_id: windows signal ID
 
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        @type signal_id: C{int}
 
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        """
 
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        msg_filter = self.viewport.get_message_filter()
 
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        if signal_id in msg_filter:
 
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            msg_filter.remove(signal_id)
 
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            self.viewport.set_message_filter(msg_filter)
 
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            del self._wndprocs[signal_id]
 
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    def _on_windows_message(self, viewport, event):
 
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        if event.message in self._wndprocs:
 
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            return self._wndprocs[event.message](viewport, event)
 
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    def clean(self):
 
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        self.viewport.disconnect(self._signal_id)
 
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        self._wndprocs = {}
 
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        self.viewport.set_message_filter([])