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Component.BltBufferStrategy (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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java.awt
Class Component.BltBufferStrategy

java.lang.Object
  |
  +--java.awt.image.BufferStrategy
        |
        +--java.awt.Component.BltBufferStrategy

Enclosing class:

Component

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protected class Component.BltBufferStrategy

extends BufferStrategy

Inner class for blitting offscreen surfaces to a component.

Since:

1.4

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Field Summary
protected  VolatileImage[]	backBuffers           The back buffers
protected  BufferCapabilities	caps           The buffering capabilities
protected  int	height
protected  boolean	validatedContents           Whether or not the drawing buffer has been recently restored from a lost state.
protected  int	width           Size of the back buffers

 

Constructor Summary
protected	Component.BltBufferStrategy(int numBuffers, BufferCapabilities caps)           Creates a new blt buffer strategy around a component

 

Method Summary
boolean	contentsLost()           Returns whether the drawing buffer was lost since the last call to getDrawGraphics.
boolean	contentsRestored()           Returns whether the drawing buffer was recently restored from a lost state and reinitialized to the default background color (white).
protected  void	createBackBuffers(int numBuffers)           Creates the back buffers
BufferCapabilities	getCapabilities()
Graphics	getDrawGraphics()
protected  void	revalidate()           Restore the drawing buffer if it has been lost
void	show()           Makes the next available buffer visible.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

caps

protected BufferCapabilities caps

The buffering capabilities

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backBuffers

protected VolatileImage[] backBuffers

The back buffers

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validatedContents

protected boolean validatedContents

Whether or not the drawing buffer has been recently restored from a lost state.

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width

protected int width

Size of the back buffers

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height

protected int height

Constructor Detail

Component.BltBufferStrategy

protected Component.BltBufferStrategy(int numBuffers,
                                      BufferCapabilities caps)

Creates a new blt buffer strategy around a component

Parameters:

caps - the capabilities of the buffers

Method Detail

createBackBuffers

protected void createBackBuffers(int numBuffers)

Creates the back buffers

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getCapabilities

public BufferCapabilities getCapabilities()

Specified by:

getCapabilities in class BufferStrategy

Returns:

the buffering capabilities of this strategy

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getDrawGraphics

public Graphics getDrawGraphics()

Specified by:

getDrawGraphics in class BufferStrategy

Returns:

the draw graphics

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show

public void show()

Makes the next available buffer visible.

Specified by:

show in class BufferStrategy

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revalidate

protected void revalidate()

Restore the drawing buffer if it has been lost

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contentsLost

public boolean contentsLost()

Description copied from class: BufferStrategy

Returns whether the drawing buffer was lost since the last call to getDrawGraphics. Since the buffers in a buffer strategy are usually type VolatileImage, they may become lost. For a discussion on lost buffers, see VolatileImage.

Specified by:

contentsLost in class BufferStrategy

Returns:

whether the drawing buffer was lost since the last call to getDrawGraphics

See Also:

VolatileImage

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contentsRestored

public boolean contentsRestored()

Description copied from class: BufferStrategy

Returns whether the drawing buffer was recently restored from a lost state and reinitialized to the default background color (white). Since the buffers in a buffer strategy are usually type VolatileImage, they may become lost. If a surface has been recently restored from a lost state since the last call to getDrawGraphics, it may require repainting. For a discussion on lost buffers, see VolatileImage.

Specified by:

contentsRestored in class BufferStrategy

Returns:

whether the drawing buffer was recently restored from a lost state and reinitialized to the default background color (white)

See Also:

VolatileImage

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.