Module java.desktop

Package javax.swing.plaf.basic

Class BasicSpinnerUI

java.lang.Object

javax.swing.plaf.ComponentUI

javax.swing.plaf.SpinnerUI

javax.swing.plaf.basic.BasicSpinnerUI

Direct Known Subclasses:

SynthSpinnerUI

public class BasicSpinnerUI
extends SpinnerUI

The default Spinner UI delegate.

Since:

1.4

Field Summary

Fields

Modifier and Type	Field	Description
protected JSpinner	spinner	The spinner that we're a UI delegate for.

Constructor Summary

Constructors

Constructor	Description
BasicSpinnerUI()	Constructs a BasicSpinnerUI.

Method Summary

Modifier and Type	Method	Description
protected JComponent	createEditor()	This method is called by installUI to get the editor component of the JSpinner.
protected LayoutManager	createLayout()	Creates a LayoutManager that manages the editor, nextButton, and previousButton children of the JSpinner.
protected Component	createNextButton()	Creates an increment button, i.e. component that replaces the spinner value with the object returned by spinner.getNextValue.
protected Component	createPreviousButton()	Creates a decrement button, i.e. component that replaces the spinner value with the object returned by spinner.getPreviousValue.
protected PropertyChangeListener	createPropertyChangeListener()	Creates a PropertyChangeListener that can be added to the JSpinner itself.
static ComponentUI	createUI(JComponent c)	Returns a new instance of BasicSpinnerUI.
int	getBaseline(JComponent c, int width, int height)	Returns the baseline.
Component.BaselineResizeBehavior	getBaselineResizeBehavior(JComponent c)	Returns an enum indicating how the baseline of the component changes as the size changes.
protected void	installDefaults()	Initialize the JSpinner border, foreground, and background, properties based on the corresponding "Spinner.*" properties from defaults table.
protected void	installKeyboardActions()	Installs the keyboard Actions onto the JSpinner.
protected void	installListeners()	Initializes PropertyChangeListener with a shared object that delegates interesting PropertyChangeEvents to protected methods.
protected void	installNextButtonListeners(Component c)	Installs the necessary listeners on the next button, c, to update the JSpinner in response to a user gesture.
protected void	installPreviousButtonListeners(Component c)	Installs the necessary listeners on the previous button, c, to update the JSpinner in response to a user gesture.
void	installUI(JComponent c)	Calls installDefaults, installListeners, and then adds the components returned by createNextButton, createPreviousButton, and createEditor.
protected void	replaceEditor(JComponent oldEditor, JComponent newEditor)	Called by the PropertyChangeListener when the JSpinner editor property changes.
protected void	uninstallDefaults()	Sets the JSpinner's layout manager to null.
protected void	uninstallListeners()	Removes the PropertyChangeListener added by installListeners.
void	uninstallUI(JComponent c)	Calls uninstallDefaults, uninstallListeners, and then removes all of the spinners children.

Methods declared in class javax.swing.plaf.ComponentUI

contains, getAccessibleChild, getAccessibleChildrenCount, getMaximumSize, getMinimumSize, getPreferredSize, paint, update

Methods declared in class java.lang.Object

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

Field Details

spinner

protected JSpinner spinner

The spinner that we're a UI delegate for. Initialized by the installUI method, and reset to null by uninstallUI.

See Also:

• installUI(javax.swing.JComponent)
• uninstallUI(javax.swing.JComponent)

Constructor Details

BasicSpinnerUI

public BasicSpinnerUI()

Constructs a BasicSpinnerUI.

Method Details

createUI

public static ComponentUI createUI(JComponent c)

Returns a new instance of BasicSpinnerUI. SpinnerListUI delegates are allocated one per JSpinner.

Parameters:

c - the JSpinner (not used)

Returns:

a new BasicSpinnerUI object

See Also:

• ComponentUI.createUI(javax.swing.JComponent)

installUI

public void installUI(JComponent c)

Calls installDefaults, installListeners, and then adds the components returned by createNextButton, createPreviousButton, and createEditor.

Overrides:

installUI in class ComponentUI

Parameters:

c - the JSpinner

See Also:

• installDefaults()
• installListeners()
• createNextButton()
• createPreviousButton()
• createEditor()

uninstallUI

public void uninstallUI(JComponent c)

Calls uninstallDefaults, uninstallListeners, and then removes all of the spinners children.

Overrides:

uninstallUI in class ComponentUI

Parameters:

c - the JSpinner (not used)

See Also:

• ComponentUI.installUI(javax.swing.JComponent)
• JComponent.updateUI()

installListeners

protected void installListeners()

Initializes PropertyChangeListener with a shared object that delegates interesting PropertyChangeEvents to protected methods.

This method is called by installUI.

See Also:

• replaceEditor(javax.swing.JComponent, javax.swing.JComponent)
• uninstallListeners()

uninstallListeners

protected void uninstallListeners()

Removes the PropertyChangeListener added by installListeners.

This method is called by uninstallUI.

See Also:

• installListeners()

installDefaults

protected void installDefaults()

Initialize the JSpinner border, foreground, and background, properties based on the corresponding "Spinner.*" properties from defaults table. The JSpinners layout is set to the value returned by createLayout. This method is called by installUI.

See Also:

• uninstallDefaults()
• installUI(javax.swing.JComponent)
• createLayout()
• LookAndFeel.installBorder(javax.swing.JComponent, java.lang.String)
• LookAndFeel.installColors(javax.swing.JComponent, java.lang.String, java.lang.String)

uninstallDefaults

protected void uninstallDefaults()

Sets the JSpinner's layout manager to null. This method is called by uninstallUI.

See Also:

• installDefaults()
• uninstallUI(javax.swing.JComponent)

installNextButtonListeners

protected void installNextButtonListeners(Component c)

Installs the necessary listeners on the next button, c, to update the JSpinner in response to a user gesture.

Parameters:

c - Component to install the listeners on

Throws:

NullPointerException - if c is null.

Since:

1.5

See Also:

• createNextButton()

installPreviousButtonListeners

protected void installPreviousButtonListeners(Component c)

Installs the necessary listeners on the previous button, c, to update the JSpinner in response to a user gesture.

Parameters:

c - Component to install the listeners on.

Throws:

NullPointerException - if c is null.

Since:

1.5

See Also:

• createPreviousButton()

createLayout

protected LayoutManager createLayout()

Creates a LayoutManager that manages the editor, nextButton, and previousButton children of the JSpinner. These three children must be added with a constraint that identifies their role: "Editor", "Next", and "Previous". The default layout manager can handle the absence of any of these children.

Returns:

a LayoutManager for the editor, next button, and previous button.

See Also:

• createNextButton()
• createPreviousButton()
• createEditor()

createPropertyChangeListener

protected PropertyChangeListener createPropertyChangeListener()

Creates a PropertyChangeListener that can be added to the JSpinner itself. Typically, this listener will call replaceEditor when the "editor" property changes, since it's the SpinnerUI's responsibility to add the editor to the JSpinner (and remove the old one). This method is called by installListeners.

Returns:

A PropertyChangeListener for the JSpinner itself

See Also:

• installListeners()

createPreviousButton

protected Component createPreviousButton()

Creates a decrement button, i.e. component that replaces the spinner value with the object returned by spinner.getPreviousValue. By default the previousButton is a JButton. If the decrement button is not needed this method should return null.

Returns:

a component that will replace the spinner's value with the previous value in the sequence, or null

See Also:

• installUI(javax.swing.JComponent)
• createNextButton()
• installPreviousButtonListeners(java.awt.Component)

createNextButton

protected Component createNextButton()

Creates an increment button, i.e. component that replaces the spinner value with the object returned by spinner.getNextValue. By default the nextButton is a JButton. If the increment button is not needed this method should return null.

Returns:

a component that will replace the spinner's value with the next value in the sequence, or null

See Also:

• installUI(javax.swing.JComponent)
• createPreviousButton()
• installNextButtonListeners(java.awt.Component)

createEditor

protected JComponent createEditor()

This method is called by installUI to get the editor component of the JSpinner. By default it just returns JSpinner.getEditor(). Subclasses can override createEditor to return a component that contains the spinner's editor or null, if they're going to handle adding the editor to the JSpinner in an installUI override.

Typically this method would be overridden to wrap the editor with a container with a custom border, since one can't assume that the editors border can be set directly.

The replaceEditor method is called when the spinners editor is changed with JSpinner.setEditor. If you've overridden this method, then you'll probably want to override replaceEditor as well.

Returns:

the JSpinners editor JComponent, spinner.getEditor() by default

See Also:

• installUI(javax.swing.JComponent)
• replaceEditor(javax.swing.JComponent, javax.swing.JComponent)
• JSpinner.getEditor()

replaceEditor

protected void replaceEditor(JComponent oldEditor,
 JComponent newEditor)

Called by the PropertyChangeListener when the JSpinner editor property changes. It's the responsibility of this method to remove the old editor and add the new one. By default this operation is just:

 spinner.remove(oldEditor);
 spinner.add(newEditor, "Editor");
 

The implementation of replaceEditor should be coordinated with the createEditor method.

Parameters:

oldEditor - an old instance of editor

newEditor - a new instance of editor

See Also:

• createEditor()
• createPropertyChangeListener()

installKeyboardActions

protected void installKeyboardActions()

Installs the keyboard Actions onto the JSpinner.

Since:

1.5

getBaseline

public int getBaseline(JComponent c,
 int width,
 int height)

Returns the baseline.

Overrides:

getBaseline in class ComponentUI

Parameters:

c - JComponent baseline is being requested for

width - the width to get the baseline for

height - the height to get the baseline for

Returns:

baseline or a value < 0 indicating there is no reasonable baseline

Throws:

NullPointerException - if c is null

IllegalArgumentException - if width or height is < 0

Since:

1.6

See Also:

• JComponent.getBaseline(int, int)

getBaselineResizeBehavior

public Component.BaselineResizeBehavior getBaselineResizeBehavior(JComponent c)

Returns an enum indicating how the baseline of the component changes as the size changes.

Overrides:

getBaselineResizeBehavior in class ComponentUI

Parameters:

c - JComponent to return baseline resize behavior for

Returns:

an enum indicating how the baseline changes as the component size changes

Throws:

NullPointerException - if c is null

Since:

1.6

See Also:

• JComponent.getBaseline(int, int)