Module org.jfree.chart

Package org.jfree.chart.plot.dial

Class AbstractDialLayer

java.lang.Object

org.jfree.chart.plot.dial.AbstractDialLayer

All Implemented Interfaces:

DialLayer

Direct Known Subclasses:

ArcDialFrame, DialBackground, DialCap, DialPointer, DialTextAnnotation, DialValueIndicator, StandardDialFrame, StandardDialRange, StandardDialScale

public abstract class AbstractDialLayer
extends Object
implements DialLayer

A base class that can be used to implement a DialLayer. It includes an event notification mechanism.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractDialLayer()	Creates a new instance.

Method Summary

Modifier and Type	Method	Description
void	addChangeListener(DialLayerChangeListener listener)	Registers an object for notification of changes to the dial layer.
Object	clone()	Returns a clone of this instance.
boolean	equals(Object obj)	Tests this instance for equality with an arbitrary object.
int	hashCode()	Returns a hash code for this instance.
boolean	hasListener(EventListener listener)	Returns true if the specified object is registered with the dataset as a listener.
boolean	isVisible()	Returns true if this layer is visible (should be displayed), and false otherwise.
protected void	notifyListeners(DialLayerChangeEvent event)	Notifies all registered listeners that the dial layer has changed.
void	removeChangeListener(DialLayerChangeListener listener)	Deregisters an object for notification of changes to the dial layer.
void	setVisible(boolean visible)	Sets the flag that determines whether or not this layer is drawn by the plot, and sends a DialLayerChangeEvent to all registered listeners.

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.jfree.chart.plot.dial.DialLayer

draw, isClippedToWindow

Constructor Detail

AbstractDialLayer

protected AbstractDialLayer()

Creates a new instance.

Method Detail

isVisible

public boolean isVisible()

Returns true if this layer is visible (should be displayed), and false otherwise.

Specified by:

isVisible in interface DialLayer

Returns:

A boolean.

See Also:

setVisible(boolean)

setVisible

public void setVisible(boolean visible)

Sets the flag that determines whether or not this layer is drawn by the plot, and sends a DialLayerChangeEvent to all registered listeners.

Parameters:

visible - the flag.

See Also:

isVisible()

equals

public boolean equals(Object obj)

Tests this instance for equality with an arbitrary object.

Overrides:

equals in class Object

Parameters:

obj - the object (null permitted).

Returns:

A boolean.

hashCode

public int hashCode()

Returns a hash code for this instance.

Overrides:

hashCode in class Object

Returns:

A hash code.

clone

public Object clone()
             throws CloneNotSupportedException

Returns a clone of this instance.

Overrides:

clone in class Object

Returns:

A clone.

Throws:

CloneNotSupportedException - if there is a problem cloning this instance.

addChangeListener

public void addChangeListener(DialLayerChangeListener listener)

Registers an object for notification of changes to the dial layer.

Specified by:

addChangeListener in interface DialLayer

Parameters:

listener - the object that is being registered.

See Also:

removeChangeListener(DialLayerChangeListener)

removeChangeListener

public void removeChangeListener(DialLayerChangeListener listener)

Deregisters an object for notification of changes to the dial layer.

Specified by:

removeChangeListener in interface DialLayer

Parameters:

listener - the object to deregister.

See Also:

addChangeListener(DialLayerChangeListener)

hasListener

public boolean hasListener(EventListener listener)

Returns true if the specified object is registered with the dataset as a listener. Most applications won't need to call this method, it exists mainly for use by unit testing code.

Specified by:

hasListener in interface DialLayer

Parameters:

listener - the listener.

Returns:

A boolean.

notifyListeners

protected void notifyListeners(DialLayerChangeEvent event)

Notifies all registered listeners that the dial layer has changed. The DialLayerChangeEvent provides information about the change.

Parameters:

event - information about the change to the axis.