javax.swing
Class DefaultBoundedRangeModel

java.lang.Object
  javax.swing.DefaultBoundedRangeModel

All Implemented Interfaces:

BoundedRangeModel, Serializable

public class DefaultBoundedRangeModel

extends Object

implements BoundedRangeModel, Serializable

A generic implementation of BoundedRangeModel.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans^TM has been added to the java.beans package. Please see XMLEncoder.

Author:

David Kloba, Hans Muller

See Also:

BoundedRangeModel, Serialized Form

Field Summary

protected ChangeEvent	changeEvent Only one ChangeEvent is needed per model instance since the event's only (read-only) state is the source property.
private int	extent
private boolean	isAdjusting
protected EventListenerList	listenerList The listeners waiting for model changes.
private int	max
private int	min
private int	value

Constructor Summary

DefaultBoundedRangeModel()
Initializes all of the properties with default values.

DefaultBoundedRangeModel(int value, int extent, int min, int max)
Initializes value, extent, minimum and maximum.

Method Summary

void	addChangeListener(ChangeListener l) Adds a ChangeListener.
protected void	fireStateChanged() Runs each ChangeListener's stateChanged method.
ChangeListener[]	getChangeListeners() Returns an array of all the change listeners registered on this DefaultBoundedRangeModel.
int	getExtent() Returns the model's extent.
EventListener[]	getListeners(Class listenerType) Returns an array of all the objects currently registered as FooListeners upon this model.
int	getMaximum() Returns the model's maximum.
int	getMinimum() Returns the model's minimum.
int	getValue() Returns the model's current value.
boolean	getValueIsAdjusting() Returns true if the value is in the process of changing as a result of actions being taken by the user.
void	removeChangeListener(ChangeListener l) Removes a ChangeListener.
void	setExtent(int n) Sets the extent to n after ensuring that n is greater than or equal to zero and falls within the model's constraints: minimum <= value <= value+extent <= maximum
void	setMaximum(int n) Sets the maximum to n after ensuring that n that the other three properties obey the model's constraints: minimum <= value <= value+extent <= maximum
void	setMinimum(int n) Sets the minimum to n after ensuring that n that the other three properties obey the model's constraints: minimum <= value <= value+extent <= maximum
void	setRangeProperties(int newValue, int newExtent, int newMin, int newMax, boolean adjusting) Sets all of the BoundedRangeModel properties after forcing the arguments to obey the usual constraints: minimum <= value <= value+extent <= maximum At most, one ChangeEvent is generated.
void	setValue(int n) Sets the current value of the model.
void	setValueIsAdjusting(boolean b) Sets the valueIsAdjusting property.
String	toString() Returns a string that displays all of the BoundedRangeModel properties.

Methods inherited from class java.lang.Object

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

Field Detail

changeEvent

protected transient ChangeEvent changeEvent

Only one ChangeEvent is needed per model instance since the event's only (read-only) state is the source property. The source of events generated here is always "this".

listenerList

protected EventListenerList listenerList

The listeners waiting for model changes.

value

private int value

extent

private int extent

min

private int min

max

private int max

isAdjusting

private boolean isAdjusting

Constructor Detail

DefaultBoundedRangeModel

public DefaultBoundedRangeModel()

Initializes all of the properties with default values. Those values are:

• value = 0
• extent = 0
• minimum = 0
• maximum = 100
• adjusting = false

DefaultBoundedRangeModel

public DefaultBoundedRangeModel(int value,
                                int extent,
                                int min,
                                int max)

Initializes value, extent, minimum and maximum. Adjusting is false. Throws an IllegalArgumentException if the following constraints aren't satisfied:

 min <= value <= value+extent <= max
 

Method Detail

getValue

public int getValue()

Returns the model's current value.

Specified by:

getValue in interface BoundedRangeModel

Returns:

the model's current value

See Also:

setValue(int), BoundedRangeModel.getValue()

getExtent

public int getExtent()

Returns the model's extent.

Specified by:

getExtent in interface BoundedRangeModel

Returns:

the model's extent

See Also:

setExtent(int), BoundedRangeModel.getExtent()

getMinimum

public int getMinimum()

Returns the model's minimum.

Specified by:

getMinimum in interface BoundedRangeModel

Returns:

the model's minimum

See Also:

setMinimum(int), BoundedRangeModel.getMinimum()

getMaximum

public int getMaximum()

Returns the model's maximum.

Specified by:

getMaximum in interface BoundedRangeModel

Returns:

the model's maximum

See Also:

setMaximum(int), BoundedRangeModel.getMaximum()

setValue

public void setValue(int n)

Sets the current value of the model. For a slider, that determines where the knob appears. Ensures that the new value, n falls within the model's constraints:

     minimum <= value <= value+extent <= maximum
 

Specified by:

setValue in interface BoundedRangeModel

Parameters:

n - the model's new value

See Also:

BoundedRangeModel.setValue(int)

setExtent

public void setExtent(int n)

Sets the extent to n after ensuring that n is greater than or equal to zero and falls within the model's constraints:

     minimum <= value <= value+extent <= maximum
 

Specified by:

setExtent in interface BoundedRangeModel

Parameters:

n - the model's new extent

See Also:

BoundedRangeModel.setExtent(int)

setMinimum

public void setMinimum(int n)

Sets the minimum to n after ensuring that n that the other three properties obey the model's constraints:

     minimum <= value <= value+extent <= maximum
 

Specified by:

setMinimum in interface BoundedRangeModel

Parameters:

n - the model's new minimum

See Also:

getMinimum(), BoundedRangeModel.setMinimum(int)

setMaximum

public void setMaximum(int n)

Sets the maximum to n after ensuring that n that the other three properties obey the model's constraints:

     minimum <= value <= value+extent <= maximum
 

Specified by:

setMaximum in interface BoundedRangeModel

Parameters:

n - the model's new maximum

See Also:

BoundedRangeModel.setMaximum(int)

setValueIsAdjusting

public void setValueIsAdjusting(boolean b)

Sets the valueIsAdjusting property.

Specified by:

setValueIsAdjusting in interface BoundedRangeModel

Parameters:

b - true if the upcoming changes to the value property are part of a series

See Also:

getValueIsAdjusting(), setValue(int), BoundedRangeModel.setValueIsAdjusting(boolean)

getValueIsAdjusting

public boolean getValueIsAdjusting()

Returns true if the value is in the process of changing as a result of actions being taken by the user.

Specified by:

getValueIsAdjusting in interface BoundedRangeModel

Returns:

the value of the valueIsAdjusting property

See Also:

setValue(int), BoundedRangeModel.getValueIsAdjusting()

setRangeProperties

public void setRangeProperties(int newValue,
                               int newExtent,
                               int newMin,
                               int newMax,
                               boolean adjusting)

Sets all of the BoundedRangeModel properties after forcing the arguments to obey the usual constraints:

     minimum <= value <= value+extent <= maximum
 

At most, one ChangeEvent is generated.

Specified by:

setRangeProperties in interface BoundedRangeModel

Parameters:

newValue - an int giving the current value

newExtent - an int giving the amount by which the value can "jump"

newMin - an int giving the minimum value

newMax - an int giving the maximum value

adjusting - a boolean, true if a series of changes are in progress

See Also:

BoundedRangeModel.setRangeProperties(int, int, int, int, boolean), setValue(int), setExtent(int), setMinimum(int), setMaximum(int), setValueIsAdjusting(boolean)

addChangeListener

public void addChangeListener(ChangeListener l)

Adds a ChangeListener. The change listeners are run each time any one of the Bounded Range model properties changes.

Specified by:

addChangeListener in interface BoundedRangeModel

Parameters:

l - the ChangeListener to add

See Also:

removeChangeListener(javax.swing.event.ChangeListener), BoundedRangeModel.addChangeListener(javax.swing.event.ChangeListener)

removeChangeListener

public void removeChangeListener(ChangeListener l)

Removes a ChangeListener.

Specified by:

removeChangeListener in interface BoundedRangeModel

Parameters:

l - the ChangeListener to remove

See Also:

addChangeListener(javax.swing.event.ChangeListener), BoundedRangeModel.removeChangeListener(javax.swing.event.ChangeListener)

getChangeListeners

public ChangeListener[] getChangeListeners()

Returns an array of all the change listeners registered on this DefaultBoundedRangeModel.

Returns:

all of this model's ChangeListeners or an empty array if no change listeners are currently registered

Since:

1.4

See Also:

addChangeListener(javax.swing.event.ChangeListener), removeChangeListener(javax.swing.event.ChangeListener)

fireStateChanged

protected void fireStateChanged()

Runs each ChangeListener's stateChanged method.

See Also:

setRangeProperties(int, int, int, int, boolean), EventListenerList

toString

public String toString()

Returns a string that displays all of the BoundedRangeModel properties.

Overrides:

toString in class Object

Returns:

a string representation of the object.

getListeners

public EventListener[] getListeners(Class listenerType)

Returns an array of all the objects currently registered as FooListeners upon this model. FooListeners are registered using the addFooListener method.

You can specify the listenerType argument with a class literal, such as FooListener.class. For example, you can query a DefaultBoundedRangeModel instance m for its change listeners with the following code:

ChangeListener[] cls = (ChangeListener[])(m.getListeners(ChangeListener.class));

If no such listeners exist, this method returns an empty array.

Parameters:

listenerType - the type of listeners requested; this parameter should specify an interface that descends from java.util.EventListener

Returns:

an array of all objects registered as FooListeners on this model, or an empty array if no such listeners have been added

Throws:

ClassCastException - if listenerType doesn't specify a class or interface that implements java.util.EventListener

Since:

1.3

See Also:

getChangeListeners()