Java javax.swing.plaf.synth Class SynthComboBoxUI（JDK8）

Constructor Detail

• SynthComboBoxUI

  public SynthComboBoxUI()

Method Detail

• createUI

  public static ComponentUI createUI(JComponent c)

  Creates a new UI object for the given component.

  Parameters:

  c - component to create UI object for

  Returns:

  the UI object

• installUI

  public void installUI(JComponent c)

  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.

  Overridden to ensure that ButtonHandler is created prior to any of the other installXXX methods, since several of them reference buttonHandler.

  Overrides:

  installUI in class BasicComboBoxUI

  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()

  Description copied from class: BasicComboBoxUI
  Installs the default colors, default font, default renderer, and default editor into the JComboBox.

  Overrides:

  installDefaults in class BasicComboBoxUI

• installListeners

  protected void installListeners()

  Creates and installs listeners for the combo box and its model. This method is called when the UI is installed.

  Overrides:

  installListeners in class BasicComboBoxUI

• uninstallUI

  public void uninstallUI(JComponent c)

  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 BasicComboBoxUI

  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()

  Uninstalls the default colors, default font, default renderer, and default editor from the combo box.

  Overrides:

  uninstallDefaults in class BasicComboBoxUI

• uninstallListeners

  protected void uninstallListeners()

  Removes the installed listeners from the combo box and its model. The number and types of listeners removed and in this method should be the same that was added in installListeners

  Overrides:

  uninstallListeners in class BasicComboBoxUI

• 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.

• createPopup

  protected ComboPopup createPopup()

  Creates the popup portion of the combo box.

  Overrides:

  createPopup in class BasicComboBoxUI

  Returns:

  an instance of ComboPopup

  See Also:

  ComboPopup

• createRenderer

  protected ListCellRenderer createRenderer()

  Creates the default renderer that will be used in a non-editiable combo box. A default renderer will used only if a renderer has not been explicitly set with setRenderer.

  Overrides:

  createRenderer in class BasicComboBoxUI

  Returns:

  a ListCellRender used for the combo box

  See Also:

  JComboBox.setRenderer(javax.swing.ListCellRenderer<? super E>)

• createEditor

  protected ComboBoxEditor createEditor()

  Creates the default editor that will be used in editable combo boxes. A default editor will be used only if an editor has not been explicitly set with setEditor.

  Overrides:

  createEditor in class BasicComboBoxUI

  Returns:

  a ComboBoxEditor used for the combo box

  See Also:

  JComboBox.setEditor(javax.swing.ComboBoxEditor)

• 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.

• createArrowButton

  protected JButton createArrowButton()

  Creates a button which will be used as the control to show or hide the popup portion of the combo box.

  Overrides:

  createArrowButton in class BasicComboBoxUI

  Returns:

  a button which represents the popup control

• 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 BasicComboBoxUI

  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.

  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

• paintCurrentValue

  public void paintCurrentValue(Graphics g,
                                Rectangle bounds,
                                boolean hasFocus)

  Paints the currently selected item.

  Overrides:

  paintCurrentValue in class BasicComboBoxUI

• getDefaultSize

  protected Dimension getDefaultSize()

  Returns the default size of an empty display area of the combo box using the current renderer and font. This method was overridden to use SynthComboBoxRenderer instead of DefaultListCellRenderer as the default renderer when calculating the size of the combo box. This is used in the case of the combo not having any data.

  Overrides:

  getDefaultSize in class BasicComboBoxUI

  Returns:

  the size of an empty display area

  See Also:

  BasicComboBoxUI.getDisplaySize()