SynthSpinnerUI (Java Platform SE 8 )
Keywords: javax.swing.plaf.synth.SynthSpinnerUI class
Date: 2026-07-22

javax.swing.plaf.synth

## Class SynthSpinnerUI

- java.lang.Object
- - javax.swing.plaf.ComponentUI
  - - javax.swing.plaf.SpinnerUI
    - - javax.swing.plaf.basic.BasicSpinnerUI
      - - javax.swing.plaf.synth.SynthSpinnerUI

- All Implemented Interfaces:
    PropertyChangeListener, EventListener, SynthConstants, SynthUI

      public class SynthSpinnerUI
      extends BasicSpinnerUI
      implements PropertyChangeListener, SynthUI

  Provides the Synth L&F UI delegate for `JSpinner`.
  Since:
    1.7

- - ### Field Summary

    - ### Fields inherited from class javax.swing.plaf.basic.BasicSpinnerUI

      `spinner`

    - ### Fields inherited from interface javax.swing.plaf.synth.SynthConstants

      `DEFAULT, DISABLED, ENABLED, FOCUSED, MOUSE_OVER, PRESSED, SELECTED`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `SynthSpinnerUI()`

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and 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.
    `protected Component` | `createPreviousButton()` Creates a decrement button, i.e.
    `static ComponentUI` | `createUI(JComponent c)` Returns a new instance of SynthSpinnerUI.
    `SynthContext` | `getContext(JComponent c)` Returns the Context for the specified component.
    `protected void` | `installDefaults()` Initializes the `JSpinner` `border`, `foreground`, and `background`, properties based on the corresponding "Spinner.*" properties from defaults table.
    `protected void` | `installListeners()` Initializes `PropertyChangeListener` with a shared object that delegates interesting PropertyChangeEvents to protected methods.
    `void` | `paint(Graphics g, JComponent c)` Paints the specified component according to the Look and Feel.
    `protected void` | `paint(SynthContext context, Graphics g)` Paints the specified component.
    `void` | `paintBorder(SynthContext context, Graphics g, int x, int y, int w, int h)` Paints the border.
    `void` | `propertyChange(PropertyChangeEvent e)` This method gets called when a bound property is changed.
    `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` | `update(Graphics g, JComponent c)` Notifies this UI delegate to repaint the specified component.

    - ### Methods inherited from class javax.swing.plaf.basic.BasicSpinnerUI

      `createPropertyChangeListener, getBaseline, getBaselineResizeBehavior, installKeyboardActions, installNextButtonListeners, installPreviousButtonListeners, installUI, uninstallUI`

    - ### Methods inherited from class javax.swing.plaf.ComponentUI

      `contains, getAccessibleChild, getAccessibleChildrenCount, getMaximumSize, getMinimumSize, getPreferredSize`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### SynthSpinnerUI

          public SynthSpinnerUI()

  - ### Method Detail

    - #### createUI

          public static ComponentUI createUI(JComponent c)

      Returns a new instance of SynthSpinnerUI.
      Parameters:
        `c` - the JSpinner (not used)
      Returns:
        a new SynthSpinnerUI object
      See Also:
        `ComponentUI.createUI(javax.swing.JComponent)`

    - #### installListeners

          protected void installListeners()

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

      This method is called by `installUI`.

      Overrides:
        `installListeners` in class `BasicSpinnerUI`
      See Also:
        `BasicSpinnerUI.replaceEditor(javax.swing.JComponent, javax.swing.JComponent)`, `BasicSpinnerUI.uninstallListeners()`

    - #### uninstallListeners

          protected void uninstallListeners()

      Removes the `PropertyChangeListener` added by installListeners.

      This method is called by `uninstallUI`.

      Overrides:
        `uninstallListeners` in class `BasicSpinnerUI`
      See Also:
        `BasicSpinnerUI.installListeners()`

    - #### installDefaults

          protected void installDefaults()

      Initializes 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`.
      Overrides:
        `installDefaults` in class `BasicSpinnerUI`
      See Also:
        `uninstallDefaults()`, `BasicSpinnerUI.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`.
      Overrides:
        `uninstallDefaults` in class `BasicSpinnerUI`
      See Also:
        `installDefaults()`, `BasicSpinnerUI.uninstallUI(javax.swing.JComponent)`

    - #### 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.
      Overrides:
        `createLayout` in class `BasicSpinnerUI`
      Returns:
        a LayoutManager for the editor, next button, and previous button.
      See Also:
        `BasicSpinnerUI.createNextButton()`, `BasicSpinnerUI.createPreviousButton()`, `BasicSpinnerUI.createEditor()`

    - #### 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`.
      Overrides:
        `createPreviousButton` in class `BasicSpinnerUI`
      Returns:
        a component that will replace the spinner's value with the previous value in the sequence, or `null`
      See Also:
        `BasicSpinnerUI.installUI(javax.swing.JComponent)`, `BasicSpinnerUI.createNextButton()`, `BasicSpinnerUI.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`.
      Overrides:
        `createNextButton` in class `BasicSpinnerUI`
      Returns:
        a component that will replace the spinner's value with the next value in the sequence, or `null`
      See Also:
        `BasicSpinnerUI.installUI(javax.swing.JComponent)`, `BasicSpinnerUI.createPreviousButton()`, `BasicSpinnerUI.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 overriden this method, then you'll probably want to override `replaceEditor` as well.

      Overrides:
        `createEditor` in class `BasicSpinnerUI`
      Returns:
        the JSpinners editor JComponent, spinner.getEditor() by default
      See Also:
        `BasicSpinnerUI.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.
      Overrides:
        `replaceEditor` in class `BasicSpinnerUI`
      See Also:
        `createEditor()`, `BasicSpinnerUI.createPropertyChangeListener()`

    - #### getContext

          public SynthContext getContext(JComponent c)

      Returns the Context for the specified component.
      Specified by:
        `getContext` in interface `SynthUI`
      Parameters:
        `c` - Component requesting SynthContext.
      Returns:
        SynthContext describing component.

    - #### update

          public void update(Graphics g,
                             JComponent c)

      Notifies this UI delegate to repaint the specified component. This method paints the component background, then calls the `paint(SynthContext,Graphics)` method.

      In general, this method does not need to be overridden by subclasses. All Look and Feel rendering code should reside in the `paint` method.

      Overrides:
        `update` in class `ComponentUI`
      Parameters:
        `g` - the `Graphics` object used for painting
        `c` - the component being painted
      See Also:
        `paint(SynthContext,Graphics)`

    - #### paint

          public void paint(Graphics g,
                            JComponent c)

      Paints the specified component according to the Look and Feel.

      This method is not used by Synth Look and Feel. Painting is handled by the `paint(SynthContext,Graphics)` method.

      Overrides:
        `paint` in class `ComponentUI`
      Parameters:
        `g` - the `Graphics` object used for painting
        `c` - the component being painted
      See Also:
        `paint(SynthContext,Graphics)`

    - #### paint

          protected void paint(SynthContext context,
                               Graphics g)

      Paints the specified component. This implementation does nothing.
      Parameters:
        `context` - context for the component being painted
        `g` - the `Graphics` object used for painting
      See Also:
        `update(Graphics,JComponent)`

    - #### paintBorder

          public void paintBorder(SynthContext context,
                                  Graphics g,
                                  int x,
                                  int y,
                                  int w,
                                  int h)

      Paints the border.
      Specified by:
        `paintBorder` in interface `SynthUI`
      Parameters:
        `context` - a component context
        `g` - `Graphics` to paint on
        `x` - the X coordinate
        `y` - the Y coordinate
        `w` - width of the border
        `h` - height of the border

    - #### propertyChange

          public void propertyChange(PropertyChangeEvent e)

      This method gets called when a bound property is changed.
      Specified by:
        `propertyChange` in interface `PropertyChangeListener`
      Parameters:
        `e` - A PropertyChangeEvent object describing the event source and the property that has changed.

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