API java : JSpinner

javax.swing
Class JSpinner

java.lang.Object
  java.awt.Component
      java.awt.Container
          javax.swing.JComponent
              javax.swing.JSpinner

All Implemented Interfaces:

ImageObserver, MenuContainer, Serializable, Accessible

public class JSpinner
extends JComponent
implements Accessible

A single line input field that lets the user select a number or an object value from an ordered sequence. Spinners typically provide a pair of tiny arrow buttons for stepping through the elements of the sequence. The keyboard up/down arrow keys also cycle through the elements. The user may also be allowed to type a (legal) value directly into the spinner. Although combo boxes provide similar functionality, spinners are sometimes preferred because they don't require a drop down list that can obscure important data.

A JSpinner's sequence value is defined by its SpinnerModel. The model can be specified as a constructor argument and changed with the model property. SpinnerModel classes for some common types are provided: SpinnerListModel, SpinnerNumberModel, and SpinnerDateModel.

A JSpinner has a single child component that's responsible for displaying and potentially changing the current element or value of the model, which is called the editor. The editor is created by the JSpinner's constructor and can be changed with the editor property. The JSpinner's editor stays in sync with the model by listening for ChangeEvents. If the user has changed the value displayed by the editor it is possible for the model's value to differ from that of the editor. To make sure the model has the same value as the editor use the commitEdit method, eg:

try {
       spinner.commitEdit();
   }
   catch (ParseException pe) {{
       // Edited value is invalid, spinner.getValue() will return
       // the last valid value, you could revert the spinner to show that:
       JComponent editor = spinner.getEditor()
       if (editor instanceof DefaultEditor) {
           ((DefaultEditor)editor).getTextField().setValue(spinner.getValue();
       }
       // reset the value to some known value:
       spinner.setValue(fallbackValue);
       // or treat the last valid value as the current, in which
       // case you don't need to do anything.
   }
   return spinner.getValue();

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans^TM has been added to the java.beans package. Please see XMLEncoder.

Since:

1.4

See Also:

SpinnerModel, AbstractSpinnerModel, SpinnerListModel, SpinnerNumberModel, SpinnerDateModel, JFormattedTextField

Nested Class Summary
protected  class	JSpinner.AccessibleJSpinner           AccessibleJSpinner implements accessibility support for the JSpinner class.
static class	JSpinner.DateEditor           An editor for a JSpinner whose model is a SpinnerDateModel.
static class	JSpinner.DefaultEditor           A simple base class for more specialized editors that displays a read-only view of the model's current value with a JFormattedTextField.
static class	JSpinner.ListEditor           An editor for a JSpinner whose model is a SpinnerListModel.
static class	JSpinner.NumberEditor           An editor for a JSpinner whose model is a SpinnerNumberModel.

 

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.BltBufferStrategy, Component.FlipBufferStrategy

 

Field Summary

 

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
JSpinner()           Constructs a spinner with an Integer SpinnerNumberModel with initial value 0 and no minimum or maximum limits.
JSpinner(SpinnerModel model)           Constructs a complete spinner with pair of next/previous buttons and an editor for the SpinnerModel.

 

Method Summary
void	addChangeListener(ChangeListener listener)           Adds a listener to the list that is notified each time a change to the model occurs.
void	commitEdit()           Commits the currently edited value to the SpinnerModel.
protected  JComponent	createEditor(SpinnerModel model)           This method is called by the constructors to create the JComponent that displays the current value of the sequence.
protected  void	fireStateChanged()           Sends a ChangeEvent, whose source is this JSpinner, to each ChangeListener.
AccessibleContext	getAccessibleContext()           Gets the AccessibleContext for the JSpinner
ChangeListener[]	getChangeListeners()           Returns an array of all the ChangeListeners added to this JSpinner with addChangeListener().
JComponent	getEditor()           Returns the component that displays and potentially changes the model's value.
SpinnerModel	getModel()           Returns the SpinnerModel that defines this spinners sequence of values.
Object	getNextValue()           Returns the object in the sequence that comes after the object returned by getValue().
Object	getPreviousValue()           Returns the object in the sequence that comes before the object returned by getValue().
SpinnerUI	getUI()           Returns the look and feel (L&F) object that renders this component.
String	getUIClassID()           Returns the suffix used to construct the name of the look and feel (L&F) class used to render this component.
Object	getValue()           Returns the current value of the model, typically this value is displayed by the editor.
void	removeChangeListener(ChangeListener listener)           Removes a ChangeListener from this spinner.
void	setEditor(JComponent editor)           Changes the JComponent that displays the current value of the SpinnerModel.
void	setModel(SpinnerModel model)           Changes the model that represents the value of this spinner.
void	setUI(SpinnerUI ui)           Sets the look and feel (L&F) object that renders this component.
void	setValue(Object value)           Changes current value of the model, typically this value is displayed by the editor.
void	updateUI()           Resets the UI property with the value from the current look and feel.

 

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, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, paramString, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, 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, addKeyListener, 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

JSpinner

public JSpinner(SpinnerModel model)

Constructs a complete spinner with pair of next/previous buttons and an editor for the SpinnerModel.

JSpinner

public JSpinner()

Constructs a spinner with an Integer SpinnerNumberModel with initial value 0 and no minimum or maximum limits.

getUI

public SpinnerUI getUI()

Returns the look and feel (L&F) object that renders this component.

Returns:

the SpinnerUI object that renders this component

setUI

public void setUI(SpinnerUI ui)

Sets the look and feel (L&F) object that renders this component.

Parameters:

ui - the SpinnerUI L&F object

See Also:

UIDefaults.getUI(javax.swing.JComponent)

getUIClassID

public String getUIClassID()

Returns the suffix used to construct the name of the look and feel (L&F) class used to render this component.

Overrides:

getUIClassID in class JComponent

Returns:

the string "SpinnerUI"

See Also:

JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

updateUI

public void updateUI()

Resets the UI property with the value from the current look and feel.

Overrides:

updateUI in class JComponent

See Also:

UIManager.getUI(javax.swing.JComponent)

createEditor

protected JComponent createEditor(SpinnerModel model)

This method is called by the constructors to create the JComponent that displays the current value of the sequence. The editor may also allow the user to enter an element of the sequence directly. An editor must listen for ChangeEvents on the model and keep the value it displays in sync with the value of the model.

Subclasses may override this method to add support for new SpinnerModel classes. Alternatively one can just replace the editor created here with the setEditor method. The default mapping from model type to editor is:

• SpinnerNumberModel => JSpinner.NumberEditor
• SpinnerDateModel => JSpinner.DateEditor
• SpinnerListModel => JSpinner.ListEditor
• all others => JSpinner.DefaultEditor

Parameters:

model - the value of getModel

Returns:

a component that displays the current value of the sequence

See Also:

getModel(), setEditor(javax.swing.JComponent)

setModel

public void setModel(SpinnerModel model)

Changes the model that represents the value of this spinner. If the editor property has not been explicitly set, the editor property is (implicitly) set after the "model" PropertyChangeEvent has been fired. The editor property is set to the value returned by createEditor, as in:

setEditor(createEditor(model));

Parameters:

model - the new SpinnerModel

Throws:

IllegalArgumentException - if model is null

See Also:

getModel(), getEditor(), setEditor(javax.swing.JComponent)

getModel

public SpinnerModel getModel()

Returns the SpinnerModel that defines this spinners sequence of values.

Returns:

the value of the model property

See Also:

setModel(javax.swing.SpinnerModel)

getValue

public Object getValue()

Returns the current value of the model, typically this value is displayed by the editor. If the user has changed the value displayed by the editor it is possible for the model's value to differ from that of the editor, refer to the class level javadoc for examples of how to deal with this.

This method simply delegates to the model. It is equivalent to:

getModel().getValue()

See Also:

setValue(java.lang.Object), SpinnerModel.getValue()

setValue

public void setValue(Object value)

Changes current value of the model, typically this value is displayed by the editor. If the SpinnerModel implementation doesn't support the specified value then an IllegalArgumentException is thrown.

This method simply delegates to the model. It is equivalent to:

getModel().setValue(value)

Throws:

IllegalArgumentException - if value isn't allowed

See Also:

getValue(), SpinnerModel.setValue(java.lang.Object)

getNextValue

public Object getNextValue()

Returns the object in the sequence that comes after the object returned by getValue(). If the end of the sequence has been reached then return null. Calling this method does not effect value.

This method simply delegates to the model. It is equivalent to:

getModel().getNextValue()

Returns:

the next legal value or null if one doesn't exist

See Also:

getValue(), getPreviousValue(), SpinnerModel.getNextValue()

addChangeListener

public void addChangeListener(ChangeListener listener)

Adds a listener to the list that is notified each time a change to the model occurs. The source of ChangeEvents delivered to ChangeListeners will be this JSpinner. Note also that replacing the model will not affect listeners added directly to JSpinner. Applications can add listeners to the model directly. In that case is that the source of the event would be the SpinnerModel.

Parameters:

listener - the ChangeListener to add

See Also:

removeChangeListener(javax.swing.event.ChangeListener), getModel()

removeChangeListener

public void removeChangeListener(ChangeListener listener)

Removes a ChangeListener from this spinner.

Parameters:

listener - the ChangeListener to remove

See Also:

fireStateChanged(), addChangeListener(javax.swing.event.ChangeListener)

getChangeListeners

public ChangeListener[] getChangeListeners()

Returns an array of all the ChangeListeners added to this JSpinner with addChangeListener().

Returns:

all of the ChangeListeners added or an empty array if no listeners have been added

Since:

1.4

fireStateChanged

protected void fireStateChanged()

Sends a ChangeEvent, whose source is this JSpinner, to each ChangeListener. When a ChangeListener has been added to the spinner, this method method is called each time a ChangeEvent is received from the model.

See Also:

addChangeListener(javax.swing.event.ChangeListener), removeChangeListener(javax.swing.event.ChangeListener), EventListenerList

getPreviousValue

public Object getPreviousValue()

Returns the object in the sequence that comes before the object returned by getValue(). If the end of the sequence has been reached then return null. Calling this method does not effect value.

This method simply delegates to the model. It is equivalent to:

getModel().getPreviousValue()

Returns:

the previous legal value or null if one doesn't exist

See Also:

getValue(), getNextValue(), SpinnerModel.getPreviousValue()

setEditor

public void setEditor(JComponent editor)

Changes the JComponent that displays the current value of the SpinnerModel. It is the responsibility of this method to disconnect the old editor from the model and to connect the new editor. This may mean removing the old editors ChangeListener from the model or the spinner itself and adding one for the new editor.

Parameters:

editor - the new editor

Throws:

IllegalArgumentException - if editor is null

See Also:

getEditor(), createEditor(javax.swing.SpinnerModel), getModel()

getEditor

public JComponent getEditor()

Returns the component that displays and potentially changes the model's value.

Returns:

the component that displays and potentially changes the model's value

See Also:

setEditor(javax.swing.JComponent), createEditor(javax.swing.SpinnerModel)

commitEdit

public void commitEdit()
                throws ParseException

Commits the currently edited value to the SpinnerModel.

If the editor is an instance of DefaultEditor, the call if forwarded to the editor, otherwise this does nothing.

Throws:

ParseException - if the currently edited value couldn't be commited.

getAccessibleContext

public AccessibleContext getAccessibleContext()

Gets the AccessibleContext for the JSpinner

Specified by:

getAccessibleContext in interface Accessible

Overrides:

getAccessibleContext in class JComponent

Returns:

the AccessibleContext for the JSpinner

Since:

1.5