The type of a method defines whether you have an event handler, a supply function, or a (normal) method.
- Event Handler
Handlers of an event, a controller, an action, or an inbound plug of a view.
- Method(通常这种方法用在components usage中有引用components触发某些事件例如：ALV上的onclick的时候，方法为onclick类型为1事件为on_click，controller为interfacecontroller components为alv)
Modularization unit within a view or a controller.
Methods of a view can only be called locally within this view. Methods of a controller (component or custom controller) can also be called from a view or another controller, provided the controller is entered as controller used .
- Supply Function (在我们创建节点的时候，在属性下面有个supply function ，我们可以再这里填写method的名字 ，这个名字实际上就是我们方法的名字，类型为2)
Method for filling a context node.
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