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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Interface AppletContext - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.applet
Interface AppletContext

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public interface AppletContext

This interface corresponds to an applet's environment: the document containing the applet and the other applets in the same document.

The methods in this interface can be used by an applet to obtain information about its environment.

Since:

JDK1.0

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Method Summary
Applet	getApplet(String name)           Finds and returns the applet in the document represented by this applet context with the given name.
Enumeration	getApplets()           Finds all the applets in the document represented by this applet context.
AudioClip	getAudioClip(URL url)           Creates an audio clip.
Image	getImage(URL url)           Returns an Image object that can then be painted on the screen.
void	showDocument(URL url)           Replaces the Web page currently being viewed with the given URL.
void	showDocument(URL url, String target)           Requests that the browser or applet viewer show the Web page indicated by the url argument.
void	showStatus(String status)           Requests that the argument string be displayed in the "status window".

 

Method Detail

getAudioClip

public AudioClip getAudioClip(URL url)

Creates an audio clip.

Parameters:

url - an absolute URL giving the location of the audio clip.

Returns:

the audio clip at the specified URL.

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getImage

public Image getImage(URL url)

Returns an Image object that can then be painted on the screen. The url argument that is passed as an argument must specify an absolute URL.

This method always returns immediately, whether or not the image exists. When the applet attempts to draw the image on the screen, the data will be loaded. The graphics primitives that draw the image will incrementally paint on the screen.

Parameters:

url - an absolute URL giving the location of the image.

Returns:

the image at the specified URL.

See Also:

Image

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getApplet

public Applet getApplet(String name)

Finds and returns the applet in the document represented by this applet context with the given name. The name can be set in the HTML tag by setting the name attribute.

Parameters:

name - an applet name.

Returns:

the applet with the given name, or null if not found.

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getApplets

public Enumeration getApplets()

Finds all the applets in the document represented by this applet context.

Returns:

an enumeration of all applets in the document represented by this applet context.

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showDocument

public void showDocument(URL url)

Replaces the Web page currently being viewed with the given URL. This method may be ignored by applet contexts that are not browsers.

Parameters:

url - an absolute URL giving the location of the document.

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showDocument

public void showDocument(URL url,
                         String target)

Requests that the browser or applet viewer show the Web page indicated by the url argument. The target argument indicates in which HTML frame the document is to be displayed. The target argument is interpreted as follows:

"_self"	Show in the window and frame that contain the applet.
"_parent"	Show in the applet's parent frame. If the applet's frame has no parent frame, acts the same as "_self".
"_top"	Show in the top-level frame of the applet's window. If the applet's frame is the top-level frame, acts the same as "_self".
"_blank"	Show in a new, unnamed top-level window.
name	Show in the frame or window named name. If a target named name does not already exist, a new top-level window with the specified name is created, and the document is shown there.

An applet viewer or browser is free to ignore showDocument.

Parameters:

url - an absolute URL giving the location of the document.

target - a String indicating where to display the page.

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showStatus

public void showStatus(String status)

Requests that the argument string be displayed in the "status window". Many browsers and applet viewers provide such a window, where the application can inform users of its current state.

Parameters:

status - a string to display in the status window.

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