Return to the homepage

Hey,.

I've seen a couple of posts related to navigate to new positions, and while I have the basic gist down, I'm having some trouble to go back to the homepage of my 2nd page.

The first page is called Unit and here is the code:

package
{
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.filesystem.File;
    import flash.text.TextField;
    import flash.text.TextFormat;

    import qnx.dialog.*;
    import qnx.display.IowWindow;
    import qnx.events.DialogEvent;
    import qnx.ui.buttons.Button;
    import qnx.ui.buttons.IconButton;
    import qnx.ui.data.DataProvider;
    import qnx.ui.display.Image;
    import qnx.ui.listClasses.DropDown;
    import qnx.ui.text.Label;

    [SWF(width="1024", height="600", backgroundColor="#cccccc", frameRate="30")]
    public class Unit extends Sprite
    {

                private var currentView:String = "mainWindow";
        private var backgroundBlack:Boolean = true;

        public function Unit()
        {
            drawMainWindow();
        }

        private function drawMainWindow():void {
            clearWindow();
            this.currentView = "mainWindow";

                        createBackground();

                        var distanceButton:IconButton = new IconButton();
            distanceButton.setSize(BUTTON_WIDTH,BUTTON_HEIGHT);
            distanceButton.addEventListener(MouseEvent.CLICK, clickDistanceButton);
            distanceButton.x = 47;
            distanceButton.y = 100;
            addChild(distanceButton);

            stage.nativeWindow.visible = true;
        }

        private function clickDistanceButton(event:MouseEvent):void {
            clearWindow();
            var distanceScreen:distance = new distance();
            addChild(distanceScreen);
        }

        private function clickHomeButton(event:MouseEvent):void {
            clearWindow();
            drawMainWindow();
        }

        public function createBackground():void {
            var appBackgroundImage:Image = new Image();
              if(backgroundBlack){
                appBackgroundImage.setImage(File.applicationDirectory.resolvePath('backgroundBlack.png').url);  

            appBackgroundImage.setPosition(0,0);
            addChild(appBackgroundImage);
        }

        //Clears the window
        private function clearWindow():void {
            while(numChildren > 0) {
                removeChildAt(0);
            }
        }

    }
}

Now my second page called 'distance.as' is:

package
{
    import flash.display.Sprite;
    import flash.events.MouseEvent;

    import qnx.ui.buttons.IconButton;

    //[SWF(width="1024", height="600", backgroundColor="#cccccc", frameRate="30")]
    public class distance extends Sprite
    {
        public function distance()
        {
            drawDistanceWindow();
        }

        public function drawDistanceWindow():void {

            //Home Button - take back to main app screen.
            var homeButton:IconButton = new IconButton();
            homeButton.addEventListener(MouseEvent.CLICK, clickHomeButton);
            homeButton.setSize(48,48);
            homeButton.setIcon("homeIcon.png");
            homeButton.x = 929;
            homeButton.y = 15;
            addChild(homeButton);
        }

        private function clickHomeButton(event:MouseEvent):void{
            clearWindow();
            var homeScreen:Unit = new Unit();
            addChild(homeScreen);
        }

        //Clears the window
        private function clearWindow():void {
            while(numChildren > 0) {
                removeChildAt(0);
            }
        }

    }
}

When I click on the "homeButton", the screen goes to gray and is not in fact add the new home screen.

Any clue?

In addition, at the same time, you will notice that my first page 'Unit' has a function called "createBackground".

I want to be able to access the function of my second page (title: distance.as). How can I do?

I don't want to rewrite the code again, and so it would be better if I just access my second page (createBackground) function.

If I do: Unit.createBackground ()... it gives me an error.

Any help would be great!

Thank you!

Here's a dispatcher singleton class where you were not sure if it was:

public class SharedData extends EventDispatcher
{
  private static var _instance          : SharedData = null;

  ///////////////////////////////////////////////////////////////////////
  public function SharedData(target:IEventDispatcher=null)
  {
    super(target);
  }

  ///////////////////////////////////////////////////////////////////////
  public static function get instance() : SharedData
  {
    if( _instance == null ) // first time
    {
        _instance = new SharedData();
    }
    return _instance;
  }

  // ...
}

The singleton is added to each class/page/EC that never needs to share information or communicate between pages:

private var shared_data : SharedData = SharedData.instance;

To send a message to a page:

this.shared_data.dispatchEvent( new Event( 'showpage1' ) );

// typically I define a public static const in the singleton class for the event id

In the main root Sprite, he listens to this event (no matter who's asking):

this.shared_data.addEventListener( 'showpage1', ShowPageOne );

// ....

private function ShowPageOne( event : Event ) : void
{
  // show page 1
}

Tags: BlackBerry Developers

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