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package
{
import flash.display.Sprite;
import flash.events.MouseEvent;
public class Scrollbar extends Sprite
{
// elements
protected var slider:Slider;
protected var up_arrow:Sprite;
protected var down_arrow:Sprite;
protected var scrollSpeed:Number = .1;
// read/write percentage value relates directly to the slider
public function get percent():Number { return slider.percent; }
public function set percent( p:Number ):void { slider.percent = p; }
/**
* Constructor
*/
public function Scrollbar()
{
createElements();
}
// executes when the up arrow is pressed
protected function arrowPressed( e:MouseEvent ):void
{
var dir:int = (e.target == up_arrow) ? -1 : 1;
slider.percent += dir * scrollSpeed;
}
/**
* Create and initialize the slider and arrow elements.
*/
protected function createElements():void
{
slider = new Slider();
up_arrow = new Sprite();
up_arrow.graphics.beginFill( 0x666666, 1 );
up_arrow.graphics.drawRect( 0, 0, 10, 10 );
up_arrow.graphics.endFill();
down_arrow = new Sprite();
down_arrow.graphics.beginFill( 0x666666, 1 );
down_arrow.graphics.drawRect( 0, 0, 10, 10 );
down_arrow.graphics.endFill();
slider.y = up_arrow.height;
down_arrow.y = slider.y + slider.height;
up_arrow.addEventListener( MouseEvent.MOUSE_DOWN, arrowPressed );
down_arrow.addEventListener( MouseEvent.MOUSE_DOWN, arrowPressed );
addChild( slider );
addChild( up_arrow );
addChild( down_arrow );
}
/**
* Override the add and remove event listeners, so that SliderEvent.CHANGE events will be
* subscribed to the Slider directly.
*
* There is issues with this however, Event.CHANGE events will get subscribed directly too Slider as well.
*/
public override function addEventListener( type:String, listener:Function, useCapture:Boolean=false, priority:int=0, useWeakReference:Boolean=false ):void
{
if ( type === SliderEvent.CHANGE )
{
slider.addEventListener( SliderEvent.CHANGE, listener, useCapture, priority, useWeakReference );
return;
}
super.addEventListener( type, listener, useCapture, priority, useWeakReference );
}
public override function removeEventListener( type:String, listener:Function, useCapture:Boolean=false ):void
{
if ( type === SliderEvent.CHANGE )
{
slider.removeEventListener( SliderEvent.CHANGE, listener, useCapture );
return;
}
super.removeEventListener( type, listener, useCapture );
}
}
} |
