Option_Scrollbar

The Option_Scrollbar AS3 (ActionScript 3.0) class provides functionality to create a custom scrollbar within a Flash application. This class extends the MovieClip class, and includes interactivity through mouse and keyboard events.

Class Structure

Filename

Option_Scrollbar.as

Package

package {
    // Import statements
    ...
    // Option_Scrollbar class definition
    public class Option_Scrollbar extends MovieClip {
        ...
    }
}

Class Definition

public class Option_Scrollbar extends MovieClip {
    ...
}

Properties

Property	Type	Description
VALUE_CHANGE	String	Static const representing the change in scrollbar value.
Track_mc	MovieClip	Represents the track of the scrollbar.
Thumb_mc	MovieClip	Represents the draggable thumb of the scrollbar.
LeftArrow_mc	MovieClip	Represents a clickable left arrow for decrementing the value.
RightArrow_mc	MovieClip	Represents a clickable right arrow for incrementing the value.
LeftCatcher_mc	MovieClip	Invisible area to detect clicks for decrementing the value.
RightCatcher_mc	MovieClip	Invisible area to detect clicks for incrementing the value.
BarCatcher_mc	MovieClip	Invisible area to detect clicks on the track bar for setting the value directly.

Methods

Constructor

public function Option_Scrollbar() {
    ...
}

Initializes the scrollbar properties and event listeners.

Public Methods

Method	Return Type	Description
Decrement	*	Decrements the value by the step size.
Increment	*	Increments the value by the step size.
HandleKeyboardInput	*	Handles keyboard input for left and right arrow keys.

Events

Event	Associated Method	Description
MouseEvent.CLICK	onClick	Handles click events for the scrollbar components.
MouseEvent.MOUSE_DOWN	onThumbMouseDown	Handles the thumb drag operation.
MouseEvent.MOUSE_UP	onThumbMouseUp	Stops the thumb drag operation.
MouseEvent.MOUSE_MOVE	onThumbMouseMove	Tracks mouse movement and updates the value during drag.

Event Dispatched

dispatchEvent(new Event(VALUE_CHANGE,true,true));

Dispatched when the value of the scrollbar is changed through interaction.

Usage

Creating an instance of Option_Scrollbar

var scrollbar:Option_Scrollbar = new Option_Scrollbar();
addChild(scrollbar);

Listening for the VALUE_CHANGE event

scrollbar.addEventListener(Option_Scrollbar.VALUE_CHANGE, valueChangeHandler);

function valueChangeHandler(event:Event):void {
    trace("Scrollbar value changed!");
}

Example

package {
    import flash.display.MovieClip;
    import flash.events.Event;
    import flash.events.MouseEvent;
    ...

    public class Option_Scrollbar extends MovieClip {
        ...
        public function Option_Scrollbar() {
            super();
            this.fMinThumbX = this.Track_mc.x;
            ...
            addEventListener(MouseEvent.CLICK, this.onClick);
            ...
        }
        ...
    }
}

Conclusion

The Option_Scrollbar class provides a customizable scrollbar with keyboard and mouse interaction capabilities, allowing users to scroll content within Flash applications. The class can be extended and modified to suit specific design and functionality requirements.