How to create and manage a nested TabbedViewNavigator? - apache-flex

Question

I'm trying to implement a nested TabbedViewNavigator (inside a View). I did this by following method 3 described in this post:
Flex - how to make a tabbed panel
Code here:
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark" title="HomeView">
<s:TabbedViewNavigator width="100%" height="100%">
<s:ViewNavigator label="1st Tab" width="100%" height="100%"
firstView="views.FirstTabView"/>
<s:ViewNavigator label="2nd Tab" width="100%" height="100%"
firstView="views.SecondTabView"/>
<s:ViewNavigator label="3rd Tab" width="100%" height="100%"
firstView="views.ThirdTabView"/>
</s:TabbedViewNavigator>
However if I call "navigator.pushView(someView)" inside one of the child views - let's say FirstTabView - the new view will be pushed into the nested TabbedViewNavigator instead of the parent's view navigator. That is not what I want. I want to completely change the application state and show a new view. How can I achieve that? Should I listen (in the main view) for changes within the nested TabbedViewNavigator and then push the new view from there? Or should I just do this some other way?

Answer 1

I solved it by using a custom event (it's custom because I need to get data from it).
Added a listener and a handler to the TabbedViewNavigator. The event is dispatched from inside the active ViewNavigator view. The event has bubbles=true so that it goes up to the top of the event chain. Then just push the new view in the event handler.
Main View:
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark" title="HomeView">
(...)
private function setup(){
tabbed_panel.addEventListener(CustomEvent.BUTTON_PRESSED, eventHandler);
}
private function eventHandler(ev:CustomEvent):void{
navigator.pushView(MyNewView,ev.event_data);
}
(...)
<s:TabbedViewNavigator id="tabbed_panel" width="100%" height="100%">
<s:ViewNavigator label="1st Tab" width="100%" height="100%"
firstView="views.FirstTabView"/>
<s:ViewNavigator label="2nd Tab" width="100%" height="100%"
firstView="views.SecondTabView"/>
</s:TabbedViewNavigator>
(...)
</s:View>
FirstTabView:
<View...>
(...)
private function buttonClickedHandler(event:Event):void{
dispatchEvent(new CustomEvent(event_data,"BUTTON_PRESSED",true));
}
(...)
</View>
I don't know if this is a corrrect approach to the problem, but it works.