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Class AsyncBoxView.ChildState

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

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

Method Summary

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 declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ChildState

public 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.

Parameters:: v - the view
Since:: 1.4

Method Details

getChildView

public View getChildView()

Fetch the child view this record represents.

Returns:: 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:

The child may have been removed from the view hierarchy.
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

getMinorSpan

public float getMinorSpan()

What is the span along the minor axis.

Returns:: the span along the minor axis

getMinorOffset

public float getMinorOffset()

What is the offset along the minor axis

Returns:: the offset along the minor axis

getMajorSpan

public float getMajorSpan()

What is the span along the major axis.

Returns:: the span along the major axis

getMajorOffset

public float getMajorOffset()

Get the offset along the major axis.

Returns:: 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.

Parameters:: offs - offsets

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:

isLayoutValid

public boolean isLayoutValid()

Has the child view been laid out.

Returns:: whether or not the child view been laid out.

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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/text/AsyncBoxView.ChildState.html