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Display Programming

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A PPT that describes Display Programming using ActionScript3.0

A PPT that describes Display Programming using ActionScript3.0

Published in: Technology

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Transcript

  • 1. Sudha Hariharan
  • 2.
    • Display Programming - Allows you to work with elements that appear on the Stage of Adobe Flash Player and Adobe Air.
    • Display List – a hierarchy of displayed objects (visible objects) that are contained in applications built in Action Script 3.0
  • 3.
    • Stage
    • Stage is the base container of display objects.
    • Every application has one stage object that contains all the on-screen display objects.
    • Stage is the top level object in the display hierarchy.
    • When a SWF File is run using Flash Player the following steps occur
    • Flash player calls the constructor function of the main class of the SWF file. The main class always extends the Sprite class.
    • The instance of the main file is created. This instance is always of the type display object.
    • The instance is added as a child to the Stage Object.
    • From any DisplayObject instance, one can access the Stage through its stage property.
  • 4.
    • Display Objects
    • Any elements that appear on the screen in an application are of type DisplayObject.
    • DisplayObject class can be found in flash.display package.
    • Subclasses of DisplayObject include vector shapes, movie clips, text fields etc.
    • Common subclasses that are used frequently are Sprite, Shape, Bitmap and MovieClip.
  • 5.
    • Display Object Containers
    • Display object Containers are display objects with a special feature that they can also contain their own child objects.
    • It is a subclass of DisplayObject class.
    • It can include multiple child display objects in its child list.
  • 6.  
  • 7.
    • Classes contained in flash.display package.
    • Bitmap - used to define bitmap objects, create bitmap objects, and alter bitmaps.
    • Loader - used to load external assets.
    • Shape - used to create vector classes such as rectangles, lines, circles, etc.
    • SimpleButton – it is an ActionScript representation of a Flash button symbol.
    • Sprite – can contain objects of its own and also other child display objects.
    • MovieClip – it is an ActionScript representation of a movie clip symbol created in Flash authoring. It is similar to Sprite object except that it has a timeline.
  • 8.
    • Classes that are not a part of flash.display package
    • TextField – it is included in the flash.text package. It is used for text display and input.
    • Video – it is included in the flash.media package. It is used for displaying video
  • 9.
    • Display objects and many of its subclasses are in reality Abstract classes. These classes serve as parent classes for other display objects, combining common functionality into a single class. Hence instances of these classes cannot be created.
    • Some of the common subclasses of Display Object that are also abstract are
    • AVMMovie1 – used to represent loaded SWF files that are authored in AS1.0 and 2.0
    • DisplayObjectContainer – has many useful subclasses such as Loader, Sprite and MovieClip
    • InteractiveObject – it is the base class for all objects used to interact with the mouse and keyboard.
    • MorphShape – These are created when you create a shape tween using Flash Authoring. They cannot be instantiated using ActionScript.
    • Stage - It is created as a singleton instance for every application and is included at the top of the display list hierarchy.
  • 10.
    • Merely instantiating a display object does not add the display object to the display list. In order to add a display object we use the addChild() method.
    • For example, to add an instance of TextField to the display list we use the following syntax
    • this.addChild(textFieldObject);
    •   Adding any visual element to the stage makes the element a child of the Stage Object.
    • In order to manipulate the appearance of the Display object we use the methods and properties available in the Display Object class.
  • 11.
    • The Following Example shows the use of Events with Display object.
    • You can find the example here and the source code here .
  • 12.
    • Flex 3 LiveDocs
    • ActionScript 3.0 Language Reference
  • 13.