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

Fields
Modifier and Type	Field and Description
`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

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Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`Component.BltBufferStrategy(int numBuffers, BufferCapabilities caps)` Creates a new blt buffer strategy around a 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`	`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.

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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:
    Window.createBufferStrategy(int), Canvas.createBufferStrategy(int), Window.getBufferStrategy(), Canvas.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

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Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-java/awt/component.bltbufferstrategy.html

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Referenzen

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Class Component.BltBufferStrategy

Referenzen