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[GEF5] Click policies chain [message #1760757]

Tue, 02 May 2017 12:33

Eclipse User

I have Pane with another Pane children. I want to add OnClickHandler which will add another componentns as childrens on TOP Pane. When i click on TOP pane which has parent Pane several OnClick events invoked by ClickDragGesture. How i can skip all events on parent Pane and handle only last event in chain to add children only to TOP Panel?

[Updated on: Tue, 02 May 2017 12:34] by Moderator

Re: [GEF5] Click policies chain [message #1760789 is a reply to message #1760757]

Tue, 02 May 2017 23:31

Eclipse User

What you mean is that the ClickDragGesture invokes multiple IOnClickHandlers (for all panes in the hierarchy), right? What you have to do in this case is to bind a different IHandlerResolver, which adjusts the default behavior by only forwarding it to a single pane (instead of all in the chain).

Re: [GEF5] Click policies chain [message #1760817 is a reply to message #1760789]

Wed, 03 May 2017 05:46

Eclipse User

Alternatively, you can simply use the AbstractHandler#isRegistered(EventTarget) and #isRegisteredForHost(EventTarget) methods to guard the IOnClickHandler implementations from running when the received event is not designated for their host. For a usage example, you can take a look at the FocusAndSelectOnClickPolicy:

// check if the host is the explicit event target
if (isRegistered(e.getTarget())
		&& !isRegisteredForHost(e.getTarget())) {
	// do not process events for other parts
	return;
}

Best regards,
Matthias

[Updated on: Wed, 03 May 2017 05:49] by Moderator

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