Represents a drawing device object.
Drawing devices have been deprecated.
Drawing using Canvas is recommended.
You can also set the value.
Setting a value automatically disables (invalidates) the drawing device previously specified for this window.
By default, an instance of the class Window.BasicDrawDevice is specified.
For more information on Window.BasicDrawDevice, see also the description in his core / visual / win32 / BasicDrawDevice.cpp in KiriKiri source.
If you want to specify your own drawing device (the one provided by the plugin), follow the documentation for that plugin.