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## com.sas.swing.visuals
Class ComboBox

    com.sas.swing.visuals.ComboBox

All Implemented Interfaces:
  com.sas.swing.visuals.ValueInterface, java.awt.event.ActionListener, java.awt.image.ImageObserver, java.awt.ItemSelectable, java.awt.MenuContainer, java.io.Serializable, java.util.EventListener, javax.accessibility.Accessible, javax.swing.event.ListDataListener

Direct Known Subclasses:
  com.sas.swing.visuals.ComponentComboBox

    public class ComboBox

implements com.sas.swing.visuals.ValueInterface

This class subclasses JComboBox to provide general extensions and corrections to behavior that are useful to applications at SAS.

Some keystrokes are currently missing from JComboBox, and so this class processes them appropriately. Specifically, spacebar opens/closes the popup list. Down arrow opens the popup list if necessary. Alt + down arrow opens the popup list while Alt + up arrow closes the popup list.

This class also includes an overloaded addItem method that takes a tool tip parameter, and will display tool tips for the items in the drop-down list.

Separators are also supported as items that can be added to the combo box.

If an item is added to the combo box and it's an instance of java.awt.Window, selecting the item from the combo box will cause the window item to be launched on screen, appearing adjacent to the combo box.

This class was originally pulled from Information Map Studio (MapCenter) and was originally written by Greg Thorne. It has been relocated here and expanded for use across other applications.

See Also:
  Serialized Form

Field Summary
`protected java.util.HashMap` | `displayNameMap`
`protected java.lang.Object` | `previousSelection`
`static java.lang.String` | `SEPARATOR`
`protected java.util.HashMap` | `toolTipMap`

Constructor Summary
`ComboBox()`
`ComboBox(javax.swing.ComboBoxModel aModel)`
`ComboBox(java.lang.Object[] items)`
`ComboBox(java.util.Vector items)`

Method Summary
`void` | `addItem(java.lang.Object item, java.lang.String toolTip)` Adds an item to the item list.
`protected void` | `alignAndShowWindow(java.awt.Window window)`
`protected void` | `init()`
`protected void` | `processComponentKeyEvent(java.awt.event.KeyEvent event)` Overrides the processing of key events to provide additional functionality.

Field Detail

### displayNameMap

    protected java.util.HashMap displayNameMap

### toolTipMap

    protected java.util.HashMap toolTipMap

### SEPARATOR

    public static java.lang.String SEPARATOR

### previousSelection

    protected java.lang.Object previousSelection

Constructor Detail

### ComboBox

    public ComboBox()

### ComboBox

    public ComboBox(java.lang.Object[] items)

### ComboBox

    public ComboBox(java.util.Vector items)

### ComboBox

    public ComboBox(javax.swing.ComboBoxModel aModel)

Method Detail

### init

    protected void init()

### alignAndShowWindow

    protected void alignAndShowWindow(java.awt.Window window)

### processComponentKeyEvent

    protected void processComponentKeyEvent(java.awt.event.KeyEvent event)

  Overrides the processing of key events to provide additional functionality.

  Overrides:
    `processComponentKeyEvent` in class `javax.swing.JComponent`

### addItem

    public void addItem(java.lang.Object item,
                        java.lang.String toolTip)

  Adds an item to the item list. This method works only if the JComboBox uses a mutable data model. This overloaded method of addItem takes an additional tooltip string parameter which will be associated with the specified item.

  You can specify ComboBox.SEPARATOR as the item to have a horizontal line separator appear in the list.

  Parameters:
    `item` - The item to add to the combobox.
    `toolTip` - The item's tooltip which will appear when the user hovers over the item in the list.

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