## org.jfree.ui
Class KeyedComboBoxModel

    java.lang.Object
      org.jfree.ui.KeyedComboBoxModel

All Implemented Interfaces:
  javax.swing.ComboBoxModel, javax.swing.ListModel

    public class KeyedComboBoxModel

extends java.lang.Object
implements javax.swing.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
`KeyedComboBoxModel()` Creates a new keyed combobox model.
`KeyedComboBoxModel(java.lang.Object[] keys, java.lang.Object[] values)` Creates a new keyed combobox model for the given keys and values.

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

  Notifies all registered list data listener of the given event.

  Parameters:
    `evt` - the event.

### getSelectedItem

    public java.lang.Object getSelectedItem()

  Returns the selected item.

  Specified by:
    `getSelectedItem` in interface `javax.swing.ComboBoxModel`
  Returns:
    The selected item or `null` if there is no selection

### setSelectedKey

    public void setSelectedKey(java.lang.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(java.lang.Object anItem)

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

  Specified by:
    `setSelectedItem` in interface `javax.swing.ComboBoxModel`
  Parameters:
    `anItem` - the list object to select or `null` to clear the selection

### addListDataListener

    public void addListDataListener(javax.swing.event.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 `javax.swing.ListModel`
  Parameters:
    `l` - the `ListDataListener` to be added

### getElementAt

    public java.lang.Object getElementAt(int index)

  Returns the value at the specified index.

  Specified by:
    `getElementAt` in interface `javax.swing.ListModel`
  Parameters:
    `index` - the requested index
  Returns:
    the value at `index`

### getKeyAt

    public java.lang.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 java.lang.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 `javax.swing.ListModel`
  Returns:
    the length of the list

### removeListDataListener

    public void removeListDataListener(javax.swing.event.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 `javax.swing.ListModel`
  Parameters:
    `l` - the `ListDataListener` to be removed

### findElementIndex

    public int findElementIndex(java.lang.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(java.lang.Object key)

  Removes an entry from the model.

  Parameters:
    `key` - the key

### add

    public void add(java.lang.Object key,
                    java.lang.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.