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

Field Summary

Fields
Modifier and Type	Field and Description
`protected BufferCapabilities`	`caps` The buffering capabilities
`protected Image`	`drawBuffer` The drawing buffer
`protected VolatileImage`	`drawVBuffer` The drawing buffer as a volatile image
`protected int`	`numBuffers` The number of buffers
`protected boolean`	`validatedContents` Whether or not the drawing buffer has been recently restored from a lost state.

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Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`Component.FlipBufferStrategy(int numBuffers, BufferCapabilities caps)` Creates a new flipping buffer strategy for this component.

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Method Summary

Methods
Modifier and Type	Method and Description
`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`	`createBuffers(int numBuffers, BufferCapabilities caps)` Creates one or more complex, flipping buffers with the given capabilities.
`protected void`	`destroyBuffers()` Destroys the buffers created through this object
`void`	`dispose()` Releases system resources currently consumed by this `BufferStrategy` and removes it from the associated Component.
`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.
`protected Image`	`getBackBuffer()`
`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 by either blitting or flipping.

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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
  - 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.
- Constructor Detail
  - 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 - if the capabilities supplied could not be supported or met
    
    ClassCastException - if the component is not a canvas or window.
    
    IllegalStateException - if the component has no peer
    
    IllegalArgumentException - if numBuffers is less than two, or if BufferCapabilities.isPageFlipping is not true.
    See Also:
    Canvas, Window, createBuffers(int, BufferCapabilities)
- Method Detail
  - 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 be true.
    
    Throws:
    
    AWTException - if the capabilities supplied could not be supported or met
    
    IllegalStateException - if the component has no peer
    
    IllegalArgumentException - if numBuffers is less than two, or if BufferCapabilities.isPageFlipping is not true.
    See Also:
    BufferCapabilities.isPageFlipping()
  - getBackBuffer
    protected Image getBackBuffer()
    
    Returns:
    direct access to the back buffer, as an image.
    
    Throws:
    
    IllegalStateException - 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 - 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()
    
    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 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
    
    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
  - show
    public void show()
    
    Makes the next available buffer visible by either blitting or flipping.
    
    Specified by:
    
    show in class BufferStrategy
  - 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:
    Window.createBufferStrategy(int), Canvas.createBufferStrategy(int), Window.getBufferStrategy(), Canvas.getBufferStrategy()

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Document heeft de 11/06/2005 gemaakt, de laatste keer de 04/03/2020 gewijzigd
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Inhoudsopgave Haut

Class Component.FlipBufferStrategy

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