jas.util
Class JASEditableComboBox

java.lang.Object
  java.awt.Component
      java.awt.Container
          javax.swing.JComponent
              javax.swing.JComboBox
                  jas.util.JASEditableComboBox

All Implemented Interfaces:

ActionListener, KeyListener, ImageObserver, ItemSelectable, MenuContainer, Serializable, EventListener, Accessible, ListDataListener

public final class JASEditableComboBox
extends JComboBox
implements KeyListener

This class is ideal if you want to have a text field for user input but also have a list of recently selected items available to choose from. Some notes on using this class:

• The default button will be clicked on the root pane of this component if the value of the constructor parameter clickDefault is true. This behaviour may be desirable because the default button is normally "clicked" when the user clicks on the "Enter" key, but this behaviour doesn't normally happen unless you add an ActionListener to the text field.
• Calling addActionListener(ActionListener) on this object causes the ActionListener to be added to the text field.
• A KeyEvent is generated for every time a key is pressed in the field, and all listeners are notified. KeyEvents normally generated by the JComboBox will not be sent by this class; they are suppressed.
• A ChangeEvent is generated any time the text in the field changes. Therefore, if you want to update a button state (for example) each time the text changes, simply implement a ChangeListener and add it to the listener list for this object. Otherwise, you would have to add a KeyListener and an ItemListener, and it's better just to have one.

It is important to point this out because the KeyEvents, ActionEvents, and ChangeEvents described above are not how a normal editable combo box will generate them.

Basically, a ChangeEvent is a dual purpose event. One is sent to listeners both when a KeyEvent is generated from the text field, and one is sent when an ItemEvent is generated (which happens when an item is selected from the drop-down list). This means that somebody who wants to know when the actual text showing has changed only needs to implement ChangeListener instead of both ItemListener and KeyListener.

Author:

Jonas Gifford

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class javax.swing.JComboBox

JComboBox.AccessibleJComboBox, JComboBox.KeySelectionManager

Nested classes/interfaces inherited from class javax.swing.JComponent

JComponent.AccessibleJComponent

Nested classes/interfaces inherited from class java.awt.Container

Container.AccessibleAWTContainer

Nested classes/interfaces inherited from class java.awt.Component

Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary

Fields inherited from class javax.swing.JComboBox

actionCommand, dataModel, editor, isEditable, keySelectionManager, lightWeightPopupEnabled, maximumRowCount, renderer, selectedItemReminder

Fields inherited from class javax.swing.JComponent

accessibleContext, listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

JASEditableComboBox(String[] dropDownItems, boolean clickDefault)
Creates a JASEditableComboBox with the given list of drop-down items.

JASEditableComboBox(String key, int nItems, boolean clickDefault)
Creates a JASEditableComboBox with a dropDown list that will be stored in the UserProperties object for the Application.

JASEditableComboBox(String key, String lengthKey, boolean clickDefault)
Creates a JASEditableComboBox with a dropDown list that will be stored in the UserProperties object for the Application.

Method Summary

void	addActionListener(ActionListener l) Adds an the given ActionListener to the text field.
void	addChangeListener(ChangeListener l) Change listeners will be notified any time the text visible in the text field changes.
void	addKeyListener(KeyListener kl) Adds a key listener to the text field, not to the JComboBox.
protected void	fireItemStateChanged(ItemEvent event) This method is protected as an implementation side effect.
Dimension	getMaximumSize() Encorporates the maximum width if it has been set.
Dimension	getMinimumSize() Encorporates the minimum width if it has been set.
Dimension	getPreferredSize() Encorporates the minimum and maximum widths if they have been set.
String	getText() Returns the text currently showing in the text field.
void	keyPressed(KeyEvent e) This method is public as an implementation side effect; do not call.
void	keyReleased(KeyEvent e) This method is public as an implementation side effect; do not call.
void	keyTyped(KeyEvent e) This method is public as an implementation side effect; do not call.
void	requestFocus() Requests focus for the text field of the box.
void	saveState() If a key was supplied to the constructor, the drop-down list will be updated to include the currently selected item.
void	setMaxWidth(int maxWidth) Set the maximum width of the box.
void	setMinWidth(int minWidth) Set the minimum width of the box.
void	setText(String s) Sets the text showing in the text field.

Methods inherited from class javax.swing.JComboBox

actionPerformed, actionPropertyChanged, addItem, addItemListener, addPopupMenuListener, configureEditor, configurePropertiesFromAction, contentsChanged, createActionPropertyChangeListener, createDefaultKeySelectionManager, fireActionEvent, firePopupMenuCanceled, firePopupMenuWillBecomeInvisible, firePopupMenuWillBecomeVisible, getAccessibleContext, getAction, getActionCommand, getActionListeners, getEditor, getItemAt, getItemCount, getItemListeners, getKeySelectionManager, getMaximumRowCount, getModel, getPopupMenuListeners, getPrototypeDisplayValue, getRenderer, getSelectedIndex, getSelectedItem, getSelectedObjects, getUI, getUIClassID, hidePopup, insertItemAt, installAncestorListener, intervalAdded, intervalRemoved, isEditable, isLightWeightPopupEnabled, isPopupVisible, paramString, processKeyEvent, removeActionListener, removeAllItems, removeItem, removeItemAt, removeItemListener, removePopupMenuListener, selectedItemChanged, selectWithKeyChar, setAction, setActionCommand, setEditable, setEditor, setEnabled, setKeySelectionManager, setLightWeightPopupEnabled, setMaximumRowCount, setModel, setPopupVisible, setPrototypeDisplayValue, setRenderer, setSelectedIndex, setSelectedItem, setUI, showPopup, updateUI

Methods inherited from class javax.swing.JComponent

addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getNextFocusableComponent, getPopupLocation, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusBackward, transferFocusDownCycle, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusUpCycle

Methods inherited from class java.lang.Object

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

Constructor Detail

JASEditableComboBox

public JASEditableComboBox(String[] dropDownItems,
                           boolean clickDefault)

Creates a JASEditableComboBox with the given list of drop-down items. You are responsible for keeping and providing an updated list.

Parameters:

dropDownItems - the items to show in the drop-down list (can safely be null)

clickDefault - whether the default button should be clicked when Enter is pressed

See Also:

JRootPane.defaultButton

JASEditableComboBox

public JASEditableComboBox(String key,
                           int nItems,
                           boolean clickDefault)

Creates a JASEditableComboBox with a dropDown list that will be stored in the UserProperties object for the Application. Invoke the saveState() method to have the list be updated to include the selected item.

Parameters:

key - the key that the drop-down items will be stored by

nItems - the maximum number of items that will be stored on the drop-down list

clickDefault - whether the default button should be clicked when Enter is pressed

See Also:

UserProperties, JRootPane.defaultButton

JASEditableComboBox

public JASEditableComboBox(String key,
                           String lengthKey,
                           boolean clickDefault)

Creates a JASEditableComboBox with a dropDown list that will be stored in the UserProperties object for the Application. Invoke the saveState() method to have the list be updated to include the selected item.

Parameters:

key - the key that the drop-down items will be stored by

lengthKey - the key that maps to the maximum number of items that will be stored on the drop-down list

clickDefault - whether the default button should be clicked when Enter is pressed

See Also:

UserProperties, JRootPane.defaultButton

Method Detail

saveState

public void saveState()

If a key was supplied to the constructor, the drop-down list will be updated to include the currently selected item.

getText

public String getText()

Returns the text currently showing in the text field.

setText

public void setText(String s)

Sets the text showing in the text field.

addKeyListener

public void addKeyListener(KeyListener kl)

Adds a key listener to the text field, not to the JComboBox.

Overrides:

addKeyListener in class Component

keyReleased

public final void keyReleased(KeyEvent e)

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

Specified by:

keyReleased in interface KeyListener

keyPressed

public final void keyPressed(KeyEvent e)

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

Specified by:

keyPressed in interface KeyListener

addChangeListener

public void addChangeListener(ChangeListener l)

Change listeners will be notified any time the text visible in the text field changes. This is equivalent to having a KeyListener and an ItemListener.

Parameters:

l - the ChangeListener to add

addActionListener

public void addActionListener(ActionListener l)

Adds an the given ActionListener to the text field.

Overrides:

addActionListener in class JComboBox

fireItemStateChanged

protected final void fireItemStateChanged(ItemEvent event)

This method is protected as an implementation side effect.

Overrides:

fireItemStateChanged in class JComboBox

requestFocus

public final void requestFocus()

Requests focus for the text field of the box.

Overrides:

requestFocus in class JComponent

keyTyped

public final void keyTyped(KeyEvent e)

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

Specified by:

keyTyped in interface KeyListener

setMaxWidth

public final void setMaxWidth(int maxWidth)

Set the maximum width of the box. The default is used if this method is not called.

Parameters:

maxWidth - give a number in pixels, or -1 to use default

setMinWidth

public final void setMinWidth(int minWidth)

Set the minimum width of the box. The default is used if this method is not called.

Parameters:

minWidth - give a number in pixels, or -1 to use default

getMaximumSize

public final Dimension getMaximumSize()

Encorporates the maximum width if it has been set.

Overrides:

getMaximumSize in class JComponent

See Also:

setMaxWidth(int)

getMinimumSize

public final Dimension getMinimumSize()

Encorporates the minimum width if it has been set.

Overrides:

getMinimumSize in class JComponent

See Also:

setMinWidth(int)

getPreferredSize

public final Dimension getPreferredSize()

Encorporates the minimum and maximum widths if they have been set.

Overrides:

getPreferredSize in class JComponent

See Also:

setMinWidth(int), setMaxWidth(int)