BasicTableHeaderUI (Java Platform SE 8 )
Keywords: javax.swing.plaf.basic.BasicTableHeaderUI class
Date: 2026-06-25

javax.swing.plaf.basic

## Class BasicTableHeaderUI

- java.lang.Object
- - javax.swing.plaf.ComponentUI
  - - javax.swing.plaf.TableHeaderUI
    - - javax.swing.plaf.basic.BasicTableHeaderUI

- Direct Known Subclasses:
    SynthTableHeaderUI

      public class BasicTableHeaderUI
      extends TableHeaderUI

  BasicTableHeaderUI implementation

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `class` | `BasicTableHeaderUI.MouseInputHandler` This class should be treated as a "protected" inner class.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected JTableHeader` | `header` The JTableHeader that is delegating the painting to this UI.
    `protected MouseInputListener` | `mouseInputListener`
    `protected CellRendererPane` | `rendererPane`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `BasicTableHeaderUI()`

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected MouseInputListener` | `createMouseInputListener()` Creates the mouse listener for the JTableHeader.
    `static ComponentUI` | `createUI(JComponent h)`
    `int` | `getBaseline(JComponent c, int width, int height)` Returns the baseline.
    `Dimension` | `getMaximumSize(JComponent c)` Return the maximum size of the header.
    `Dimension` | `getMinimumSize(JComponent c)` Return the minimum size of the header.
    `Dimension` | `getPreferredSize(JComponent c)` Return the preferred size of the header.
    `protected int` | `getRolloverColumn()` Returns the index of the column header over which the mouse currently is.
    `protected void` | `installDefaults()` Initializes JTableHeader properties such as font, foreground, and background.
    `protected void` | `installKeyboardActions()` Register all keyboard actions on the JTableHeader.
    `protected void` | `installListeners()` Attaches listeners to the JTableHeader.
    `void` | `installUI(JComponent c)` Configures the specified component appropriately for the look and feel.
    `void` | `paint(Graphics g, JComponent c)` Paints the specified component appropriately for the look and feel.
    `protected void` | `rolloverColumnUpdated(int oldColumn, int newColumn)` This method gets called every time when a rollover column in the table header is updated.
    `protected void` | `uninstallDefaults()`
    `protected void` | `uninstallKeyboardActions()` Unregisters default key actions.
    `protected void` | `uninstallListeners()`
    `void` | `uninstallUI(JComponent c)` Reverses configuration which was done on the specified component during `installUI`.

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

      `contains, getAccessibleChild, getAccessibleChildrenCount, getBaselineResizeBehavior, update`

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

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

- - ### Field Detail

    - #### header

          protected JTableHeader header

      The JTableHeader that is delegating the painting to this UI.

    - #### rendererPane

          protected CellRendererPane rendererPane

    - #### mouseInputListener

          protected MouseInputListener mouseInputListener

  - ### Constructor Detail

    - #### BasicTableHeaderUI

          public BasicTableHeaderUI()

  - ### Method Detail

    - #### createMouseInputListener

          protected MouseInputListener createMouseInputListener()

      Creates the mouse listener for the JTableHeader.

    - #### createUI

          public static ComponentUI createUI(JComponent h)

    - #### installUI

          public void installUI(JComponent c)

      Description copied from class: `ComponentUI`
      Configures the specified component appropriately for the look and feel. This method is invoked when the `ComponentUI` instance is being installed as the UI delegate on the specified component. This method should completely configure the component for the look and feel, including the following:
      1. Install default property values for color, fonts, borders, icons, opacity, etc. on the component. Whenever possible, property values initialized by the client program should not be overridden.
      2. Install a `LayoutManager` on the component if necessary.
      3. Create/add any required sub-components to the component.
      4. Create/install event listeners on the component.
      5. Create/install a `PropertyChangeListener` on the component in order to detect and respond to component property changes appropriately.
      6. Install keyboard UI (mnemonics, traversal, etc.) on the component.
      7. Initialize any appropriate instance data.
      Overrides:
        `installUI` in class `ComponentUI`
      Parameters:
        `c` - the component where this UI delegate is being installed
      See Also:
        `ComponentUI.uninstallUI(javax.swing.JComponent)`, `JComponent.setUI(javax.swing.plaf.ComponentUI)`, `JComponent.updateUI()`

    - #### installDefaults

          protected void installDefaults()

      Initializes JTableHeader properties such as font, foreground, and background. The font, foreground, and background properties are only set if their current value is either null or a UIResource, other properties are set if the current value is null.
      See Also:
        `installUI(javax.swing.JComponent)`

    - #### installListeners

          protected void installListeners()

      Attaches listeners to the JTableHeader.

    - #### installKeyboardActions

          protected void installKeyboardActions()

      Register all keyboard actions on the JTableHeader.

    - #### uninstallUI

          public void uninstallUI(JComponent c)

      Description copied from class: `ComponentUI`
      Reverses configuration which was done on the specified component during `installUI`. This method is invoked when this `UIComponent` instance is being removed as the UI delegate for the specified component. This method should undo the configuration performed in `installUI`, being careful to leave the `JComponent` instance in a clean state (no extraneous listeners, look-and-feel-specific property objects, etc.). This should include the following:
      1. Remove any UI-set borders from the component.
      2. Remove any UI-set layout managers on the component.
      3. Remove any UI-added sub-components from the component.
      4. Remove any UI-added event/property listeners from the component.
      5. Remove any UI-installed keyboard UI from the component.
      6. Nullify any allocated instance data objects to allow for GC.
      Overrides:
        `uninstallUI` in class `ComponentUI`
      Parameters:
        `c` - the component from which this UI delegate is being removed; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
      See Also:
        `ComponentUI.installUI(javax.swing.JComponent)`, `JComponent.updateUI()`

    - #### uninstallDefaults

          protected void uninstallDefaults()

    - #### uninstallListeners

          protected void uninstallListeners()

    - #### uninstallKeyboardActions

          protected void uninstallKeyboardActions()

      Unregisters default key actions.

    - #### getRolloverColumn

          protected int getRolloverColumn()

      Returns the index of the column header over which the mouse currently is. When the mouse is not over the table header, -1 is returned.
      Returns:
        the index of the current rollover column
      Since:
        1.6
      See Also:
        `rolloverColumnUpdated(int, int)`

    - #### rolloverColumnUpdated

          protected void rolloverColumnUpdated(int oldColumn,
                                               int newColumn)

      This method gets called every time when a rollover column in the table header is updated. Every look and feel that supports a rollover effect in a table header should override this method and repaint the header.
      Parameters:
        `oldColumn` - the index of the previous rollover column or -1 if the mouse was not over a column
        `newColumn` - the index of the new rollover column or -1 if the mouse is not over a column
      Since:
        1.6
      See Also:
        `getRolloverColumn()`, `JTableHeader.getHeaderRect(int)`

    - #### 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)`

    - #### paint

          public void paint(Graphics g,
                            JComponent c)

      Description copied from class: `ComponentUI`
      Paints the specified component appropriately for the look and feel. This method is invoked from the `ComponentUI.update` method when the specified component is being painted. Subclasses should override this method and use the specified `Graphics` object to render the content of the component.
      Overrides:
        `paint` in class `ComponentUI`
      Parameters:
        `g` - the `Graphics` context in which to paint
        `c` - the component being painted; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
      See Also:
        `ComponentUI.update(java.awt.Graphics, javax.swing.JComponent)`

    - #### getMinimumSize

          public Dimension getMinimumSize(JComponent c)

      Return the minimum size of the header. The minimum width is the sum of the minimum widths of each column (plus inter-cell spacing).
      Overrides:
        `getMinimumSize` in class `ComponentUI`
      Parameters:
        `c` - the component whose minimum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
      Returns:
        a `Dimension` object or `null`
      See Also:
        `JComponent.getMinimumSize()`, `LayoutManager.minimumLayoutSize(java.awt.Container)`, `ComponentUI.getPreferredSize(javax.swing.JComponent)`

    - #### getPreferredSize

          public Dimension getPreferredSize(JComponent c)

      Return the preferred size of the header. The preferred height is the maximum of the preferred heights of all of the components provided by the header renderers. The preferred width is the sum of the preferred widths of each column (plus inter-cell spacing).
      Overrides:
        `getPreferredSize` in class `ComponentUI`
      Parameters:
        `c` - the component whose preferred size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
      See Also:
        `JComponent.getPreferredSize()`, `LayoutManager.preferredLayoutSize(java.awt.Container)`

    - #### getMaximumSize

          public Dimension getMaximumSize(JComponent c)

      Return the maximum size of the header. The maximum width is the sum of the maximum widths of each column (plus inter-cell spacing).
      Overrides:
        `getMaximumSize` in class `ComponentUI`
      Parameters:
        `c` - the component whose maximum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
      Returns:
        a `Dimension` object or `null`
      See Also:
        `JComponent.getMaximumSize()`, `LayoutManager2.maximumLayoutSize(java.awt.Container)`

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