JComboBox

This protected field is implementation specific. Do not access directly or override. Use the accessor methods instead.

This protected field is implementation specific. Do not access directly or override. Use the accessor methods instead.

This protected field is implementation specific. Do not access directly or override. Use the accessor methods instead.

This protected field is implementation specific. Do not access directly or override. Use the accessor methods instead.

This protected field is implementation specific. Do not access directly or override. Use the accessor methods instead.

This protected field is implementation specific. Do not access directly or override. Use the accessor methods instead.

This protected field is implementation specific. Do not access directly or override. Use the accessor methods instead.

This protected field is implementation specific. Do not access directly or override. Use the accessor methods instead.

This protected field is implementation specific. Do not access directly or override.

Creates a JComboBox that takes its items from an existing ComboBoxModel. Since the ComboBoxModel is provided, a combo box created using this constructor does not create a default combo box model and may impact how the insert, remove and add methods behave.

Creates a JComboBox that contains the elements in the specified array. By default the first item in the array (and therefore the data model) becomes selected.

Creates a JComboBox that contains the elements in the specified Vector. By default the first item in the vector (and therefore the data model) becomes selected.

Creates a JComboBox with a default data model. The default data model is an empty list of objects. Use addItem to add items. By default the first item in the data model becomes selected.

This method is public as an implementation side effect. do not call or override.

Adds an ActionListener.

The ActionListener will receive an ActionEvent when a selection has been made. If the combo box is editable, then an ActionEvent will be fired when editing has stopped.

Adds an item to the item list. This method works only if the JComboBox uses a mutable data model.

Warning: Focus and keyboard navigation problems may arise if you add duplicate String objects. A workaround is to add new objects instead of String objects and make sure that the toString() method is defined. For example:

   comboBox.addItem(makeObj("Item 1"));
   comboBox.addItem(makeObj("Item 1"));
   ...
   private Object makeObj(final String item)  {
     return new Object() { public String toString() { return item; } };
   }
 

Adds an ItemListener.

aListener will receive one or two ItemEvents when the selected item changes.

Adds a PopupMenu listener which will listen to notification messages from the popup portion of the combo box.

For all standard look and feels shipped with Java, the popup list portion of combo box is implemented as a JPopupMenu. A custom look and feel may not implement it this way and will therefore not receive the notification.

Initializes the editor with the specified item.

This method is public as an implementation side effect. do not call or override.

Notifies PopupMenuListeners that the popup portion of the combo box has been canceled.

This method is public but should not be called by anything other than the UI delegate.

Notifies PopupMenuListeners that the popup portion of the combo box has become invisible.

This method is public but should not be called by anything other than the UI delegate.

Notifies PopupMenuListeners that the popup portion of the combo box will become visible.

This method is public but should not be called by anything other than the UI delegate.

Gets the AccessibleContext associated with this JComboBox. For combo boxes, the AccessibleContext takes the form of an AccessibleJComboBox. A new AccessibleJComboBox instance is created if necessary.

Returns the currently set Action for this ActionEvent source, or null if no Action is set.

Returns the action command that is included in the event sent to action listeners.

Returns an array of all the ActionListeners added to this JComboBox with addActionListener().

Returns the editor used to paint and edit the selected item in the JComboBox field.

Returns the list item at the specified index. If index is out of range (less than zero or greater than or equal to size) it will return null.

Returns the number of items in the list.

Returns an array of all the ItemListeners added to this JComboBox with addItemListener().

Returns the list's key-selection manager.

Returns the maximum number of items the combo box can display without a scrollbar

Returns the data model currently used by the JComboBox.

Returns an array of all the PopupMenuListeners added to this JComboBox with addPopupMenuListener().

Returns the "prototypical display" value - an Object used for the calculation of the display height and width.

Returns the renderer used to display the selected item in the JComboBox field.

Returns the first item in the list that matches the given item. The result is not always defined if the JComboBox allows selected items that are not in the list. Returns -1 if there is no selected item or if the user specified an item which is not in the list.

Returns the current selected item.

If the combo box is editable, then this value may not have been added to the combo box with addItem, insertItemAt or the data constructors.

Returns an array containing the selected item. This method is implemented for compatibility with ItemSelectable.

Returns the L&F object that renders this component.

Returns the name of the L&F class that renders this component.

Causes the combo box to close its popup window.

Inserts an item into the item list at a given index. This method works only if the JComboBox uses a mutable data model.

This method is public as an implementation side effect. do not call or override.

This method is public as an implementation side effect. do not call or override.

Returns true if the JComboBox is editable. By default, a combo box is not editable.

Gets the value of the lightWeightPopupEnabled property.

Determines the visibility of the popup.

Handles KeyEvents, looking for the Tab key. If the Tab key is found, the popup window is closed.

Removes an ActionListener.

Removes all items from the item list.

Removes an item from the item list. This method works only if the JComboBox uses a mutable data model.

Removes the item at anIndex This method works only if the JComboBox uses a mutable data model.

Removes an ItemListener.

Removes a PopupMenuListener.

Selects the list item that corresponds to the specified keyboard character and returns true, if there is an item corresponding to that character. Otherwise, returns false.

Sets the Action for the ActionEvent source. The new Action replaces any previously set Action but does not affect ActionListeners independently added with addActionListener. If the Action is already a registered ActionListener for the ActionEvent source, it is not re-registered.

Setting the Action results in immediately changing all the properties described in Swing Components Supporting Action. Subsequently, the combobox's properties are automatically updated as the Action's properties change.

This method uses three other methods to set and help track the Action's property values. It uses the configurePropertiesFromAction method to immediately change the combobox's properties. To track changes in the Action's property values, this method registers the PropertyChangeListener returned by createActionPropertyChangeListener. The default PropertyChangeListener invokes the actionPropertyChanged method when a property in the Action changes.

Sets the action command that should be included in the event sent to action listeners.

Determines whether the JComboBox field is editable. An editable JComboBox allows the user to type into the field or selected an item from the list to initialize the field, after which it can be edited. (The editing affects only the field, the list item remains intact.) A non editable JComboBox displays the selected item in the field, but the selection cannot be modified.

Sets the editor used to paint and edit the selected item in the JComboBox field. The editor is used only if the receiving JComboBox is editable. If not editable, the combo box uses the renderer to paint the selected item.

Enables the combo box so that items can be selected. When the combo box is disabled, items cannot be selected and values cannot be typed into its field (if it is editable).

Sets the object that translates a keyboard character into a list selection. Typically, the first selection with a matching first character becomes the selected item.

Sets the lightWeightPopupEnabled property, which provides a hint as to whether or not a lightweight Component should be used to contain the JComboBox, versus a heavyweight Component such as a Panel or a Window. The decision of lightweight versus heavyweight is ultimately up to the JComboBox. Lightweight windows are more efficient than heavyweight windows, but lightweight and heavyweight components do not mix well in a GUI. If your application mixes lightweight and heavyweight components, you should disable lightweight popups. The default value for the lightWeightPopupEnabled property is true, unless otherwise specified by the look and feel. Some look and feels always use heavyweight popups, no matter what the value of this property.