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/OpenJDK 21

Class DefaultBoundedRangeModel

java.lang.Object
javax.swing.DefaultBoundedRangeModel
All Implemented Interfaces:
Serializable, BoundedRangeModel 
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 has been added to the java.beans package. Please see XMLEncoder.

Since:
1.2
See Also:

Field Summary

Modifier and Type Field Description
protected ChangeEvent changeEvent
Only one ChangeEvent is needed per model instance since the event's only (read-only) state is the source property.
protected EventListenerList listenerList
The listeners waiting for model changes.

Constructor Summary

Constructor Description
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

Modifier and Type Method Description
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.
<T extends EventListener>
T[]		 getListeners(Class<T> 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:
void setMaximum(int n)
Sets the maximum to n after ensuring that n that the other three properties obey the model's constraints:
void setMinimum(int n)
Sets the minimum to n after ensuring that n that the other three properties obey the model's constraints:
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:
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 declared in class java.lang.Object

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

Field Details

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.

Constructor Details

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
Parameters:
value - an int giving the current value
extent - the length of the inner range that begins at the model's value
min - an int giving the minimum value
max - an int giving the maximum value

Method Details

getValue

public int getValue()
Returns the model's current value.
Specified by:
getValue in interface BoundedRangeModel
Returns:
the model's current value
See Also:

getExtent

public int getExtent()
Returns the model's extent.
Specified by:
getExtent in interface BoundedRangeModel
Returns:
the model's extent
See Also:

getMinimum

public int getMinimum()
Returns the model's minimum.
Specified by:
getMinimum in interface BoundedRangeModel
Returns:
the model's minimum
See Also:

getMaximum

public int getMaximum()
Returns the model's maximum.
Specified by:
getMaximum in interface BoundedRangeModel
Returns:
the model's maximum
See Also:

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:

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:

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:

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:

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

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:

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:

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

public void removeChangeListener(ChangeListener l)
Removes a ChangeListener.
Specified by:
removeChangeListener in interface BoundedRangeModel
Parameters:
l - the ChangeListener to remove
See Also:

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:

fireStateChanged

protected void fireStateChanged()
Runs each ChangeListener's stateChanged method.
See Also:

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 <T extends EventListener> T[] getListeners(Class<T> 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.
Type Parameters:
T - the type of EventListener class being requested
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:

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/DefaultBoundedRangeModel.html