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The
ActionScript 3.0 flash.display package includes classes for visual
objects that can appear in Flash Player or AIR. The following illustration
shows the subclass relationships of these core display object classes.
The illustration shows the class inheritance of display object
classes. Note that some of these classes, specifically StaticText,
TextField, and Video, are not in the flash.display package, but
they still inherit from the DisplayObject class.
All classes that extend the DisplayObject class inherit its methods
and properties. For more information, see
Properties and methods of the DisplayObject class
.
You can instantiate objects of the following classes contained
in the flash.display package:
-
Bitmap—You
use the Bitmap class to define bitmap objects, either loaded from
external files or rendered through ActionScript. You can load bitmaps from
external files through the Loader class. You can load GIF, JPG,
or PNG files. You can also create a BitmapData object with custom
data and then create a Bitmap object that uses that data. You can
use the methods of the BitmapData class to alter bitmaps, whether
they are loaded or created in ActionScript. For more information,
see
Loading display objects
and
Working with bitmaps
.
-
Loader—You use the Loader class to load external assets (either
SWF files or graphics). For more information, see
Loading display content dynamically
.
-
Shape—You use
the Shape class to create vector graphics, such as rectangles, lines,
circles, and so on. For more information, see
Using the drawing API
.
-
SimpleButton—A
SimpleButton object is the ActionScript representation of a button
symbol created in the Flash authoring tool. A SimpleButton instance has
four button states: up, down, over, and hit test (the area that
responds to mouse and keyboard events).
-
Sprite—A Sprite
object can contain graphics of its own, and it can contain child
display objects. (The Sprite class extends the DisplayObjectContainer class).
For more information, see
Working with display object containers
and
Using the drawing API
.
-
MovieClip—A
MovieClip object is the ActionScript form of a movie clip symbol created
in the Flash authoring tool. In practice, a MovieClip is similar
to a Sprite object, except that it also has a timeline. For more
information, see
Working with movie clips
.
The following classes, which are not in the flash.display package,
are subclasses of the DisplayObject class:
-
The TextField
class, included in the flash.text package, is a display object for text
display and input. For more information, see
Basics of Working with text
.
-
The TextLine class, included in the flash.text.engine package,
is the display object used to display lines of text composed by
the Flash Text Engine and the Text Layout Framework. For more information,
see
Using the Flash Text Engine
and
Using the Text Layout Framework
.
-
The Video class, included in the flash.media package, is
the display object used for displaying video files. For more information,
see
Working with video
.
The following classes in the flash.display package extend the
DisplayObject class, but you cannot create instances of them. Instead,
they serve as parent classes for other display objects, combining
common functionality into a single class.
-
AVM1Movie—The
AVM1Movie class is used to represent loaded SWF files that are authored
in ActionScript 1.0 and 2.0.
-
DisplayObjectContainer—The
Loader, Stage, Sprite, and MovieClip classes each extend the DisplayObjectContainer
class. For more information, see
Working with display object containers
.
-
InteractiveObject—InteractiveObject
is the base class for all objects used to interact with the mouse
and keyboard. SimpleButton, TextField, Loader, Sprite, Stage, and
MovieClip objects are all subclasses of the InteractiveObject class. For
more information on creating mouse and keyboard interaction, see
Basics of user interaction
.
-
MorphShape—These
objects are created when you create a shape tween in the Flash authoring
tool. You cannot instantiate them using ActionScript, but they can
be accessed from the display list.
-
Stage—The Stage class extends the DisplayObjectContainer
class. There is one Stage instance for an application, and it is
at the top of the display list hierarchy. To access the Stage, use
the
stage
property of any DisplayObject instance.
For more information, see
Setting Stage properties
.
Also,
the StaticText class, in the flash.text package, extends the DisplayObject class,
but you cannot create an instance of it in code. Static text fields
are created only in Flash.
The following classes are not display objects or display object
containers, and do not appear in the display list, but do display
graphics on the stage. These classes draw into a rectangle, called
a viewport, positioned relative to the stage.
The following fl.display classes provide functionality that parallels
the flash.display.Loader and LoaderInfo classes. Use these classes
instead of their flash.display counterparts if you are developing
in the Flash Professional environment (CS5.5 or later). In that
environment, these classes help solve issues involving TLF with
RSL preloading. For more information, see
Using the ProLoader and ProLoaderInfo classes
.
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