def get_plugin_classes():
    """Get list of default plugin classes to use for Mayavi."""

    # Force the selection of a toolkit:
    from traitsui.api import toolkit
    toolkit()
    from traits.etsconfig.api import ETSConfig
    try_use_ipython = preference_manager.root.use_ipython
    use_ipython = False
    if ETSConfig.toolkit < 'wx' and try_use_ipython:
        try:
            # If the right versions of IPython, EnvisagePlugins and
            # Pyface are not installed, this import will fail.
            from envisage.plugins.ipython_shell.view.ipython_shell_view \
                    import IPythonShellView
            use_ipython = True
        except: pass

    if use_ipython:
        from envisage.plugins.ipython_shell.ipython_shell_plugin import \
                IPythonShellPlugin
        PythonShellPlugin = IPythonShellPlugin
    else:
        from envisage.plugins.python_shell.python_shell_plugin import PythonShellPlugin
    from envisage.plugins.text_editor.text_editor_plugin import TextEditorPlugin
    from apptools.logger.plugin.logger_plugin import LoggerPlugin
    from tvtk.plugins.scene.ui.scene_ui_plugin import SceneUIPlugin
    from mayavi.plugins.mayavi_ui_plugin import MayaviUIPlugin
    plugins = get_non_gui_plugin_classes()
    plugins.extend([
                LoggerPlugin,
                MayaviUIPlugin,
                SceneUIPlugin,
                PythonShellPlugin,
                TextEditorPlugin,
                ])
    return plugins
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