Component.FlipBufferStrategy (Java 2 Platform SE 5.0) (original) (raw)

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

Enclosing class:

Component

protected class Component.FlipBufferStrategy

extends BufferStrategy

Inner class for flipping buffers on a component. That component must be a Canvas or Window.

Since:

1.4

See Also:

Canvas, Window, BufferStrategy

numBuffers

protected int numBuffers

The number of buffers

caps

protected BufferCapabilities caps

The buffering capabilities

drawBuffer

protected Image drawBuffer

The drawing buffer

drawVBuffer

protected VolatileImage drawVBuffer

The drawing buffer as a volatile image

validatedContents

protected boolean validatedContents

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

Component.FlipBufferStrategy

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

Creates a new flipping buffer strategy for this component. The component must be a Canvas or Window.

Parameters:

numBuffers - the number of buffers

caps - the capabilities of the buffers

Throws:

[AWTException](../../java/awt/AWTException.html "class in java.awt") - if the capabilities supplied could not be supported or met

[ClassCastException](../../java/lang/ClassCastException.html "class in java.lang") - if the component is not a canvas or window.

See Also:

Canvas, Window

createBuffers

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

Creates one or more complex, flipping buffers with the given capabilities.

Parameters:

numBuffers - number of buffers to create; must be greater than one

caps - the capabilities of the buffers.BufferCapabilities.isPageFlipping must betrue.

Throws:

[AWTException](../../java/awt/AWTException.html "class in java.awt") - if the capabilities supplied could not be supported or met

[IllegalStateException](../../java/lang/IllegalStateException.html "class in java.lang") - if the component has no peer

[IllegalArgumentException](../../java/lang/IllegalArgumentException.html "class in java.lang") - if numBuffers is less than two, or if BufferCapabilities.isPageFlipping is nottrue.

See Also:

BufferCapabilities.isPageFlipping()

getBackBuffer

protected Image getBackBuffer()

Returns:

direct access to the back buffer, as an image.

Throws:

[IllegalStateException](../../java/lang/IllegalStateException.html "class in java.lang") - if the buffers have not yet been created

flip

protected void flip(BufferCapabilities.FlipContents flipAction)

Flipping moves the contents of the back buffer to the front buffer, either by copying or by moving the video pointer.

Parameters:

flipAction - an integer value describing the flipping action for the contents of the back buffer. This should be one of the values of the BufferCapabilities.FlipContents property.

Throws:

[IllegalStateException](../../java/lang/IllegalStateException.html "class in java.lang") - if the buffers have not yet been created

See Also:

BufferCapabilities.getFlipContents()

destroyBuffers

protected void destroyBuffers()

Destroys the buffers created through this object

getCapabilities

public BufferCapabilities getCapabilities()

Specified by:

[getCapabilities](../../java/awt/image/BufferStrategy.html#getCapabilities%28%29) in class [BufferStrategy](../../java/awt/image/BufferStrategy.html "class in java.awt.image")

Returns:

the buffering capabilities of this strategy

getDrawGraphics

public Graphics getDrawGraphics()

Specified by:

[getDrawGraphics](../../java/awt/image/BufferStrategy.html#getDrawGraphics%28%29) in class [BufferStrategy](../../java/awt/image/BufferStrategy.html "class in java.awt.image")

Returns:

the graphics on 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 must be handled by the application.

revalidate

protected void revalidate()

Restore the drawing buffer if it has been lost

contentsLost

public boolean contentsLost()

Description copied from class: [BufferStrategy](../../java/awt/image/BufferStrategy.html#contentsLost%28%29)

Returns whether the drawing buffer was lost since the last call togetDrawGraphics. 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](../../java/awt/image/BufferStrategy.html#contentsLost%28%29) in class [BufferStrategy](../../java/awt/image/BufferStrategy.html "class in java.awt.image")

Returns:

whether the drawing buffer was lost since the last call togetDrawGraphics

See Also:

VolatileImage

contentsRestored

public boolean contentsRestored()

Description copied from class: [BufferStrategy](../../java/awt/image/BufferStrategy.html#contentsRestored%28%29)

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 typeVolatileImage, they may become lost. If a surface has been recently restored from a lost state since the last call togetDrawGraphics, it may require repainting. For a discussion on lost buffers, see VolatileImage.

Specified by:

[contentsRestored](../../java/awt/image/BufferStrategy.html#contentsRestored%28%29) in class [BufferStrategy](../../java/awt/image/BufferStrategy.html "class in java.awt.image")

Returns:

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

See Also:

VolatileImage

show

public void show()

Makes the next available buffer visible by either blitting or flipping.

Specified by:

[show](../../java/awt/image/BufferStrategy.html#show%28%29) in class [BufferStrategy](../../java/awt/image/BufferStrategy.html "class in java.awt.image")

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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.

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