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java.awt
Class Component.FlipBufferStrategy  

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

Direct Known Subclasses:

Canvas.CanvasFlipBufferStrategy, Window.WindowFlipBufferStrategy

Enclosing class:

Component

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protected class Component.FlipBufferStrategy

extends java.awt.image.BufferStrategy

This class provides support for flipping component buffers. It can only be used on Canvases and Windows.

Since:

1.4

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Field Summary
protected  BufferCapabilities	caps           The capabilities of this buffering strategy.
protected  Image	drawBuffer           An Image reference to the drawing buffer.
protected  java.awt.image.VolatileImage	drawVBuffer           A VolatileImage reference to the drawing buffer.
private  int	height           The height of the back buffer.
protected  int	numBuffers           The number of buffers.
protected  boolean	validatedContents           Whether or not the image buffer resources are allocated and ready to be drawn into.
private  int	width           The width of the back buffer.

 

Constructor Summary
protected	Component.FlipBufferStrategy(int numBuffers, BufferCapabilities caps)           Creates a flipping buffer strategy.

 

Method Summary
boolean	contentsLost()           Returns whether or not the image buffer resources have been lost.
boolean	contentsRestored()           Returns whether or not the image buffer resources have been restored.
protected  void	createBuffers(int numBuffers, BufferCapabilities caps)           Creates a multi-buffer flipping strategy.
protected  void	destroyBuffers()           Release the back buffer's resources.
protected  void	flip(BufferCapabilities.FlipContents flipAction)           Perform a flip operation to transfer the contents of the back buffer to the front buffer.
protected  Image	getBackBuffer()           Return a direct reference to the back buffer image.
BufferCapabilities	getCapabilities()           Retrieves the capabilities of this buffer strategy.
Graphics	getDrawGraphics()           Retrieves a graphics object that can be used to draw into this strategy's image buffer.
protected  void	revalidate()           Re-create the image buffer resources if they've been lost.
void	show()           Bring the contents of the back buffer to the front buffer.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

numBuffers

protected int numBuffers

The number of buffers.

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caps

protected BufferCapabilities caps

The capabilities of this buffering strategy.

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drawBuffer

protected Image drawBuffer

An Image reference to the drawing buffer.

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drawVBuffer

protected java.awt.image.VolatileImage drawVBuffer

A VolatileImage reference to the drawing buffer.

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validatedContents

protected boolean validatedContents

Whether or not the image buffer resources are allocated and ready to be drawn into.

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width

private int width

The width of the back buffer.

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height

private int height

The height of the back buffer.

Constructor Detail

Component.FlipBufferStrategy

protected Component.FlipBufferStrategy(int numBuffers,
                                       BufferCapabilities caps)
                                throws AWTException

Creates a flipping buffer strategy. The only supported strategy for FlipBufferStrategy itself is a double-buffer page flipping strategy. It forms the basis for more complex derived strategies.

Method Detail

createBuffers

protected void createBuffers(int numBuffers,
                             BufferCapabilities caps)
                      throws AWTException

Creates a multi-buffer flipping strategy. The number of buffers must be greater than one and the buffer capabilities must specify page flipping.

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getBackBuffer

protected Image getBackBuffer()

Return a direct reference to the back buffer image.

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flip

protected void flip(BufferCapabilities.FlipContents flipAction)

Perform a flip operation to transfer the contents of the back buffer to the front buffer.

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destroyBuffers

protected void destroyBuffers()

Release the back buffer's resources.

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getCapabilities

public BufferCapabilities getCapabilities()

Retrieves the capabilities of this buffer strategy.

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getDrawGraphics

public Graphics getDrawGraphics()

Retrieves a graphics object that can be used to draw into this strategy's image buffer.

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revalidate

protected void revalidate()

Re-create the image buffer resources if they've been lost.

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contentsLost

public boolean contentsLost()

Returns whether or not the image buffer resources have been lost.

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contentsRestored

public boolean contentsRestored()

Returns whether or not the image buffer resources have been restored.

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show

public void show()

Bring the contents of the back buffer to the front buffer.

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