Tag Archives: ActionScript 3

Disable bounce and pull effects on Flex Scroller component

Today I stumbled on a problem with Flex Spark Scroller and List components while developing an AIR mobile application.

Scroller component has a nice bounce effect when you pull it and it works the same way as you’ll expect the scrolling to work on iPhone (read here).

You don’t always need this behavior, and for some reason you can’t disable this effect. Another problem is that all the possible properties and methods on the Scroller class, which might allow you to change this functionality are eighter private or protected.

The only possible way to go is extending the Scroller class and disabling this effect manually in your class.

Here is a class I’ve created which does exactly thiscom.avladov.components.Scroller

In order to disable the viewport dimensions overshooting just set overhsootEnabled value to false when you use the component.

Bouncing is diabled through overriding of performDrag and performThrow methods and resetting required values when needed.

If you have a better idea, feel free to share it 😉

Creating an image only mobile button skins for Flex 4 (AIR Mobile)

One of the main differences when creating mobile Flex AIR apps from normal Flex Apps is that it’s better to use ActionScript only skins. With that in mind I’ve created a simple skin for image buttons.

Why this skin is better than using the default spark.skins.mobile.ButtonSkin? The answer is quite simple – performance. Since this is going to be an image only skin, we don’t need label element and all the other functionality the default mobile button skin has.

In order to use the class you just create a new skin extending the ImageButtonSkin. The properties you have to set inside tour constructor are upBorderSkin, downBorderSkin, measuredDefaultWidth and measuredDefaultHeight.

For the border skin properties you can use – images, SWF symbols, FGX files

Usage example:

public class ExampleButtonSkin extends ImageButtonSkin {

    private var up:Class;

    private var down:Class;
    public function ExampleButtonSkin ButtonSkin() 
        upBorderSkin = up;
        downBorderSkin = down;
        measuredDefaultWidth = 230;
        measuredDefaultHeight = 80;

If you want to use FXG border skins then you don’t need up and down variabled. You can set the FXG classes on the upBorderSkin and downBorderSkin directly.
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