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public function ClickEvent(type:String, data:Object = null) {

super(type, true, true);

this.data = data;

}

public override function clone():Event {

return new ClickEvent(this.type, this.data);

}

}

Individual Views

Let’s examine some of the views.

Inheritance

Some functionality is identical for all views. For this reason, they all inherit from the same super class, called BaseView. Here we declare two member variables, id and container, and a function, setID. It is a simple class initially. We will develop it further in this chapter to add a button and interactivity to navigate in reverse:

package view {

import flash.display.Sprite;

import flash.events.Event;

import flash.events.MouseEvent;

public class BaseView extends Sprite

{

protected var id:int;

protected var container:Sprite;

protected function SeID(id:int):void {

this.id = id;

}

}

}

The following code is for the MenuView class. It adds three buttons—for sessions, speakers, and a custom schedule—and their listeners on onShow. It clears listeners and empties the display list on onHide. Figure 16-2 shows the Menu view of the AIR scheduler application for the 2010 GoogleIO conference:

package view {

import flash.events.MouseEvent;

import view.ClickEvent;

final public class MenuView extends BaseView implements IView() {

public function MenuView(){}

public function onShow():void {

var sessions:sessionsBut = new sessionsBut();

sessions.view = "sessions";

sessions.addEventListener(MouseEvent.CLICK, onClickAway);

var speakers:speakersBut = new speakersBut();

speakers.view = "speakers";

speakers.addEventListener(MouseEvent.CLICK, onClickAway);

var schedule:scheduleBut = new scheduleBut();

schedule.view = "schedule";

schedule.addEventListener(MouseEvent.CLICK, onClickAway);

addChild(sessions);

addChild(speakers);

addChild(schedule);

}

public function onHide():void {

while(numChildren > 0) {

getChildAt(0).

removeEventListener(MouseEvent.CLICK, onClickAway);

removeChildAt(0);

}

}

public function onClickAway(event:MouseEvent):void {

dispatchEvent(new ClickEvent(ClickEvent.NAV_EVENT,

{view:event.currentTarget.view});

}

}

}

Figure 16-2. The Menu view of the AIR scheduler application for the 2010 GoogleIO conference

The next example shows the SessionsView code. Note that the code is minimal to keep the focus on navigation. For instance, the scrolling mechanism was left out. The full application is provided in the code depository, and I will cover scrolling in Chapter 17, in the Album example.

As mentioned before, the initialization process for each view only needs to happen once for the life of the application. Here the SessionsView class acquires the data for the sessions just once if its list variable is null.

The sessions data is stored in a Vector object called sessionList of the static class Sessions (not covered here) and is populated with objects of data type Session. It is already sorted and organized by day and time:

package view {

import events.ClickEvent;

import flash.events.MouseEvent;

import model.Sessions; // static class holds list of all Sessions

import model.Session; // class holds individual session data

final public class SessionsView extends BaseView implements IView() {

private var list:Vector.;

public function SessionsView (){}

]

public function onShow():void {

container = new Sprite();

// request list of sessions if not acquired yet

if (list == null) {

list = Sessions.sessionList;

}

// display sessions

showSessions();

}

}

We traverse the list of sessions and display all the sessions with the hardcoded date of 19. Again, this is to keep this example simple. The conference took place over two days and would, in a full example, require a UI to choose between one of the two dates:

private showSessions():void {

var timeKeeper:String = "0";

var bounds:int = list.length;

var ypos:int = 50;

for (var i:int = 0; i < bounds; i++) {

var session:Session = list[i];

// display a blue time indicator if it is a new