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Each component has parameters that
you can set to change its appearance and behavior. A parameter is
a property of the component’s class and appears in the Property
inspector and the Component inspector. The most commonly used properties
appear as authoring parameters; others you must set with ActionScript.
All parameters that can be set during authoring can also be set
with ActionScript. Setting a parameter with ActionScript overrides
any value set during authoring.
Most ActionScript 3.0 User Interface components inherit properties
and methods from the UIComponent class as well as from a base class.
For example, the Button and CheckBox classes inherit properties
from both the UIComponent class and the BaseButton class. A component’s
inherited properties, as well as its own class properties, are available
for you to access. For example, the ProgressBar component inherits
the
ProgressBar.enabled
property from UIComponent
but also has its own
ProgressBar.percentComplete
property. You
can access both of these properties to interact with an instance
of the ProgressBar component. For more information on a component’s
properties, see its class entry in the
ActionScript 3.0 Reference for the Adobe
Flash Platform
.
You can set parameters for a
component instance using either the Property inspector or the Component
inspector.
Enter an instance name for a component in the Property inspector:
-
Select Window > Properties > Properties.
-
Select an instance of a component on the Stage.
-
Enter a name for the component instance in the box that says
<Instance Name>, located beneath the drop-down list that says
Movie Clip. Or click the Parameters tab and enter the name in the
box below the word
Component
. Enter values for any parameters
that you want to set.
It’s
a good idea to add a suffix to the instance name to indicate what
kind of component it is; this makes it easier to read your ActionScript
code. For example, the instance name
licenseSb
identifies
that a component is a scroll bar that scrolls a license agreement
in the
licenseTa
text area.
Enter parameters for a component instance in the Component inspector:
-
Select Window > Component Inspector.
-
Select an instance of a component on the Stage.
-
Click the Parameters tab and enter values for any of the
listed parameters.
Component parameters in the Component inspector
Set component properties in ActionScript
In
ActionScript, you use a dot (.) operator (dot syntax) to access
properties or methods that belong to an object or instance on the
Stage. A dot syntax expression begins with the name of the instance,
followed by a dot, and it ends with the element you want to specify.
For example, the following ActionScript code sets the
width
property
of the CheckBox instance
aCh
to make it 50 pixels wide:
aCh.width = 50;
The following
if
statement checks to see if
the user has selected the check box:
if (aCh.selected == true) {
displayImg(redCar);
}
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