Hi guys, Lior's UI design overview is very good, I just have a small comment: Event listener registration should be preferably done in Presenter(Widget)s instead of in Views, simply because Presenter(Widget).registerHandler() method will ensure that these listeners are removed properly when a non-singleton Presenter(Widget)/View component is disposed a.k.a "unbound" [i.e. HostSetupNetworksPopup{PresenterWidget|View} is non-singleton, just like any other dialog bound to UiCommon model]. Furthermore, edit() could be potentially called multiple times to repeatedly refresh UI from UiCommon model, so event listeners should be registered only once in HostSetupNetworksPopupPresenterWidget.init() method override, instead. In case of Setup Host Networks dialog, it's not a big deal, HostSetupNetworksPopupView.edit() is called only once when the dialog is shown, though.. Regards, Vojtech ----- Original Message ----- From: "Lior Vernia" <lvernia(a)redhat.com&gt; To: "bigclouds" <bigclouds(a)163.com&gt; Cc: users(a)ovirt.org Sent: Tuesday, April 23, 2013 9:29:52 AM Subject: Re: [Users] how to understand UI design Hello, Generally speaking, for each popup window and tab you have a model class in the uicommonweb project which takes care of the business logic, and a view class in the webadmin project which takes care of presenting the logic to the user. Concerning UI operations (drag & drop, clicking etc.), there's a system of events and listeners. If you're asking specifically about the Setup Networks dialog, a good place to start is the HostSetupNetworksPopupView class. Notice the method edit() where event listeners are created and events are handled. Hope this helps, feel free to ask more specific questions. Yours, Lior Vernia. On 23/04/13 09:47, bigclouds wrote: _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users