在Openbox里实现像Windows7那样的Window snap功能 （即Win+left或right时，附着在屏幕左边或右边并以半屏大小显示，Win+Up的时候最大化，Win+Down时取消最大化）

rc.xml

<!-- Add following content in .config/openbox/rc.xml -->
<!-- After saving, execute "openbox --reconfigure" to refresh -->
<!-- Ref: https://wiki.archlinux.org/index.php/Openbox#Window_snap_behaviour -->

    <keybind key="W-Left">
      <action name="UnmaximizeFull"/>
      <action name="MaximizeVert"/>
      <action name="MoveResizeTo">
         <width>50%</width>
      </action>
      <action name="MoveToEdge"><direction>west</direction></action>
    </keybind>
    <keybind key="W-Right">
      <action name="UnmaximizeFull"/>
      <action name="MaximizeVert"/>
      <action name="MoveResizeTo">
        <width>50%</width>
      </action>
      <action name="MoveToEdge"><direction>east</direction></action>
    </keybind>
    <keybind key="W-Down">
      <action name="Unmaximize"/>
    </keybind>
    <keybind key="W-Up">
      <action name="Maximize"/>
    </keybind>