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Class 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.

See Also:
BoundedRangeModel

Fields

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.

Constructors

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

Methods

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 <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.
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()

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