org.jfree.ui

Class KeyedComboBoxModel

java.lang.Object

org.jfree.ui.KeyedComboBoxModel

All Implemented Interfaces:

ComboBoxModel, ListModel

public class KeyedComboBoxModel
extends Object
implements ComboBoxModel

The KeyedComboBox model allows to define an internal key (the data element) for every entry in the model.

This class is usefull in all cases, where the public text differs from the internal view on the data. A separation between presentation data and processing data is a prequesite for localizing combobox entries. This model does not allow selected elements, which are not in the list of valid elements.

Author:

Thomas Morgner

Constructor Summary

Constructors

Constructor and Description
KeyedComboBoxModel() Creates a new keyed combobox model.
KeyedComboBoxModel(Object[] keys, Object[] values) Creates a new keyed combobox model for the given keys and values.

Method Summary

Methods

Modifier and Type	Method and Description
void	add(Object key, Object cbitem) Adds a new entry to the model.
void	addListDataListener(ListDataListener l) Adds a listener to the list that's notified each time a change to the data model occurs.
void	clear() Removes all entries from the model.
int	findElementIndex(Object key) Tries to find the index of element with the given key.
protected void	fireListDataEvent(ListDataEvent evt) Notifies all registered list data listener of the given event.
Object	getElementAt(int index) Returns the value at the specified index.
Object	getKeyAt(int index) Returns the key from the given index.
Object	getSelectedItem() Returns the selected item.
Object	getSelectedKey() Returns the selected data element or null if none is set.
int	getSize() Returns the length of the list.
void	removeDataElement(Object key) Removes an entry from the model.
void	removeListDataListener(ListDataListener l) Removes a listener from the list that's notified each time a change to the data model occurs.
void	setAllowOtherValue(boolean allowOtherValue)
void	setData(Object[] keys, Object[] values) Replaces the data in this combobox model.
void	setSelectedItem(Object anItem) Set the selected item.
void	setSelectedKey(Object anItem) Defines the selected key.

Methods inherited from class java.lang.Object

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

Constructor Detail

KeyedComboBoxModel

public KeyedComboBoxModel()

Creates a new keyed combobox model.

KeyedComboBoxModel

public KeyedComboBoxModel(Object[] keys,
                  Object[] values)

Creates a new keyed combobox model for the given keys and values. Keys and values must have the same number of items.

Parameters:

keys - the keys

values - the values

Method Detail

setData

public void setData(Object[] keys,
           Object[] values)

Replaces the data in this combobox model. The number of keys must be equals to the number of values.

Parameters:

keys - the keys

values - the values

fireListDataEvent

protected void fireListDataEvent(ListDataEvent evt)

Notifies all registered list data listener of the given event.

Parameters:

evt - the event.

getSelectedItem

public Object getSelectedItem()

Returns the selected item.

Specified by:

getSelectedItem in interface ComboBoxModel

Returns:

The selected item or null if there is no selection

setSelectedKey

public void setSelectedKey(Object anItem)

Defines the selected key. If the object is not in the list of values, no item gets selected.

Parameters:

anItem - the new selected item.

setSelectedItem

public void setSelectedItem(Object anItem)

Set the selected item. The implementation of this method should notify all registered ListDataListeners that the contents have changed.

Specified by:

setSelectedItem in interface ComboBoxModel

Parameters:

anItem - the list object to select or null to clear the selection

setAllowOtherValue

public void setAllowOtherValue(boolean allowOtherValue)

Parameters:

allowOtherValue -

addListDataListener

public void addListDataListener(ListDataListener l)

Adds a listener to the list that's notified each time a change to the data model occurs.

Specified by:

addListDataListener in interface ListModel

Parameters:

l - the ListDataListener to be added

getElementAt

public Object getElementAt(int index)

Returns the value at the specified index.

Specified by:

getElementAt in interface ListModel

Parameters:

index - the requested index

Returns:

the value at index

getKeyAt

public Object getKeyAt(int index)

Returns the key from the given index.

Parameters:

index - the index of the key.

Returns:

the the key at the specified index.

getSelectedKey

public Object getSelectedKey()

Returns the selected data element or null if none is set.

Returns:

the selected data element.

getSize

public int getSize()

Returns the length of the list.

Specified by:

getSize in interface ListModel

Returns:

the length of the list

removeListDataListener

public void removeListDataListener(ListDataListener l)

Removes a listener from the list that's notified each time a change to the data model occurs.

Specified by:

removeListDataListener in interface ListModel

Parameters:

l - the ListDataListener to be removed

findElementIndex

public int findElementIndex(Object key)

Tries to find the index of element with the given key. The key must not be null.

Parameters:

key - the key for the element to be searched.

Returns:

the index of the key, or -1 if not found.

removeDataElement

public void removeDataElement(Object key)

Removes an entry from the model.

Parameters:

key - the key

add

public void add(Object key,
       Object cbitem)

Adds a new entry to the model.

Parameters:

key - the key

cbitem - the display value.

clear

public void clear()

Removes all entries from the model.