AsyncBoxView.ChildState (Java Platform SE 8 ) (original) (raw)

• java.lang.Object

• • javax.swing.text.AsyncBoxView.ChildState

• All Implemented Interfaces:
  Runnable
  Enclosing class:
  AsyncBoxView

public class AsyncBoxView.ChildState
extends Object
implements Runnable
A record representing the layout state of a child view. It is runnable as a task on another thread. All access to the child view that is based upon a read-lock on the model should synchronize on this object (i.e. The layout thread and the GUI thread can both have a read lock on the model at the same time and are not protected from each other). Access to a child view hierarchy is serialized via synchronization on the ChildState instance.
Since:
1.3

• • Constructor Summary

  Constructors

  Constructor	Description
  ChildState(View v)	Construct a child status.

  • Method Summary

  All Methods Instance Methods Concrete Methods

  Modifier and Type	Method	Description
  View	getChildView()	Fetch the child view this record represents
  float	getMajorOffset()	Get the offset along the major axis
  float	getMajorSpan()	What is the span along the major axis.
  float	getMinorOffset()	What is the offset along the minor axis
  float	getMinorSpan()	What is the span along the minor axis.
  boolean	isLayoutValid()	Has the child view been laid out.
  void	preferenceChanged(boolean width, boolean height)	Mark preferences changed for this child.
  void	run()	Update the child state.
  void	setMajorOffset(float offs)	This method should only be called by the ChildLocator, it is simply a convenient place to hold the cached location.

     * ### Methods inherited from class java.lang.[Object](../../../java/lang/Object.html "class in java.lang")  
     `[clone](../../../java/lang/Object.html#clone--), [equals](../../../java/lang/Object.html#equals-java.lang.Object-), [finalize](../../../java/lang/Object.html#finalize--), [getClass](../../../java/lang/Object.html#getClass--), [hashCode](../../../java/lang/Object.html#hashCode--), [notify](../../../java/lang/Object.html#notify--), [notifyAll](../../../java/lang/Object.html#notifyAll--), [toString](../../../java/lang/Object.html#toString--), [wait](../../../java/lang/Object.html#wait--), [wait](../../../java/lang/Object.html#wait-long-), [wait](../../../java/lang/Object.html#wait-long-int-)`

• • Constructor Detail

     * #### ChildState  
     public ChildState([View](../../../javax/swing/text/View.html "class in javax.swing.text") v)  
     Construct a child status. This needs to start out as fairly large so we don't falsely begin with the idea that all of the children are visible.  
     Since:  
     1.4  

  • Method Detail

    * #### getChildView  
    public [View](../../../javax/swing/text/View.html "class in javax.swing.text") getChildView()  
    Fetch the child view this record represents  
    * #### run  
    public void run()  
    Update the child state. This should be called by the thread that desires to spend time updating the child state (intended to be the layout thread).  
     This acquires a read lock on the associated document for the duration of the update to ensure the model is not changed while it is operating. The first thing to do would be to see if any work actually needs to be done. The following could have conceivably happened while the state was waiting to be updated:  
             1. The child may have been removed from the view hierarchy.  
             2. The child may have been updated by a higher priority operation (i.e. the child may have become visible).  
    Specified by:  
    `[run](../../../java/lang/Runnable.html#run--)` in interface `[Runnable](../../../java/lang/Runnable.html "interface in java.lang")`  
    See Also:  
    [Thread.run()](../../../java/lang/Thread.html#run--)  
    * #### getMinorSpan  
    public float getMinorSpan()  
    What is the span along the minor axis.  
    * #### getMinorOffset  
    public float getMinorOffset()  
    What is the offset along the minor axis  
    * #### getMajorSpan  
    public float getMajorSpan()  
    What is the span along the major axis.  
    * #### getMajorOffset  
    public float getMajorOffset()  
    Get the offset along the major axis  
    * #### setMajorOffset  
    public void setMajorOffset(float offs)  
    This method should only be called by the ChildLocator, it is simply a convenient place to hold the cached location.  
    * #### preferenceChanged  
    public void preferenceChanged(boolean width,  
                                  boolean height)  
    Mark preferences changed for this child.  
    Parameters:  
    `width` \- true if the width preference has changed  
    `height` \- true if the height preference has changed  
    See Also:  
    [JComponent.revalidate()](../../../javax/swing/JComponent.html#revalidate--)  
    * #### isLayoutValid  
    public boolean isLayoutValid()  
    Has the child view been laid out.

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