AsyncBoxView.ChildState (Java Platform SE 7 b138)

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 and Description

AsyncBoxView.ChildState(View v)
Construct a child status.

Constructors
Constructor and Description
`AsyncBoxView.ChildState(View v)` Construct a child status.

Method Summary

Methods
Modifier and Type	Method and 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
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AsyncBoxView.ChildState
```
public AsyncBoxView.ChildState(View 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 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 aquires 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 in interface Runnable
    
    See Also:
    Thread.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()
  - isLayoutValid
```
public boolean isLayoutValid()
```
    Has the child view been laid out.

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2011, Oracle and/or its affiliates. All rights reserved.
DRAFT ea-b138

Class AsyncBoxView.ChildState

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

AsyncBoxView.ChildState

Method Detail

getChildView

run

getMinorSpan

getMinorOffset

getMajorSpan

getMajorOffset

setMajorOffset

preferenceChanged

isLayoutValid