当前页面: 在线文档首页 > JDK 5 Documentation v6.0, Java 2 SDK 英文文档

Component.BltBufferStrategy (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

---

Overview  Package   Class  Use  Tree  Deprecated  Index  Help		Java™ Platform Standard Ed. 6
PREV CLASS   NEXT CLASS	FRAMES    NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---

java.awt
Class Component.BltBufferStrategy

java.lang.Object
  java.awt.image.BufferStrategy
      java.awt.Component.BltBufferStrategy

Enclosing class:

Component

---

protected class Component.BltBufferStrategy
extends BufferStrategy

Inner class for blitting offscreen surfaces to a component.

Since:

1.4

---

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
void	dispose()           Releases system resources currently consumed by this BufferStrategy and removes it from the associated Component.
BufferCapabilities	getCapabilities()           Returns the BufferCapabilities for this BufferStrategy.
Graphics	getDrawGraphics()           Creates a graphics context for the drawing buffer.
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

---

backBuffers

protected VolatileImage[] backBuffers

The back buffers

---

validatedContents

protected boolean validatedContents

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

---

width

protected int width

Size of the back buffers

---

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:

numBuffers - number of buffers to create, including the front buffer

caps - the capabilities of the buffers

Method Detail

dispose

public void dispose()

Releases system resources currently consumed by this BufferStrategy and removes it from the associated Component. After invoking this method, getBufferStrategy will return null. Trying to use a BufferStrategy after it has been disposed will result in undefined behavior.

Overrides:

dispose in class BufferStrategy

Since:

1.6

See Also:

Component.createBufferStrategy(int), Component.getBufferStrategy()

---

createBackBuffers

protected void createBackBuffers(int numBuffers)

Creates the back buffers

---

getCapabilities

public BufferCapabilities getCapabilities()

Description copied from class: BufferStrategy

Returns the BufferCapabilities for this BufferStrategy.

Specified by:

getCapabilities in class BufferStrategy

Returns:

the buffering capabilities of this strategy

---

getDrawGraphics

public Graphics getDrawGraphics()

Description copied from class: BufferStrategy

Creates a graphics context for the drawing buffer. This method may not be synchronized for performance reasons; use of this method by multiple threads should be handled at the application level. Disposal of the graphics object obtained must be handled by the application.

Specified by:

getDrawGraphics in class BufferStrategy

Returns:

the draw graphics

---

show

public void show()

Makes the next available buffer visible.

Specified by:

show in class BufferStrategy

---

revalidate

protected void revalidate()

Restore the drawing buffer if it has been lost

---

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

---

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

---

Overview  Package   Class  Use  Tree  Deprecated  Index  Help		Java™ Platform Standard Ed. 6
PREV CLASS   NEXT CLASS	FRAMES    NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---

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

Copyright 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.