javax.swing.plaf.basic
class BasicSpinnerUI

java.lang.Object javax.swing.plaf.ComponentUI javax.swing.plaf.SpinnerUI javax.swing.plaf.basic.BasicSpinnerUI

public class BasicSpinnerUI
extends SpinnerUI

The default Spinner UI delegate.

spinner

protected JSpinner spinner

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

BasicSpinnerUI

public BasicSpinnerUI()

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 overriden this method, then you'll probably want to override replaceEditor as well.

Returns:

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

createLayout

protected LayoutManager createLayout()

Create 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.

createNextButton

protected Component createNextButton()

Create a component that will replace the spinner models value with the object returned by spinner.getNextValue. By default the nextButton is a JButton who's ActionListener updates it's JSpinner ancestors model. If a nextButton isn't needed (in a subclass) then override this method to return null.

Returns:

a component that will replace the spinners model with the next value in the sequence, or null

createPreviousButton

protected Component createPreviousButton()

Create a component that will replace the spinner models value with the object returned by spinner.getPreviousValue. By default the previousButton is a JButton. This method invokes installPreviousButtonListeners to install the necessary listeners to update the JSpinner's model in response to a user gesture. If a previousButton isn't needed (in a subclass) then override this method to return null.

Returns:

a component that will replace the spinners model with the next value in the sequence, or null

createPropertyChangeListener

protected PropertyChangeListener createPropertyChangeListener()

Create 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

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

getBaseline

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

Returns the baseline.

Overrides:

getBaseline in class ComponentUI

Parameters:

c

width

height

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

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.

installKeyboardActions

protected void installKeyboardActions()

Installs the keyboard Actions onto the JSpinner.

installListeners

protected void installListeners()

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

This method is called by installUI.

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

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.

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

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

newEditor

uninstallDefaults

protected void uninstallDefaults()

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

uninstallListeners

protected void uninstallListeners()

Removes the PropertyChangeListener added by installListeners.

This method is called by uninstallUI.

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)