Class BasicHeaderUI


  • public class BasicHeaderUI
    extends HeaderUI
    Base implementation of Header UI.

    PENDING JW: This implementation is unusual in that it does not keep a reference to the component it controls. Typically, such is only the case if the ui is shared between instances. Historical? A consequence is that the un/install methods need to carry the header as parameter. Which looks funny when at the same time the children of the header are instance fields in this. Should think about cleanup: either get rid off the instance fields here, or reference the header and remove the param (would break subclasses).

    PENDING JW: keys for uidefaults are inconsistent - most have prefix "JXHeader." while defaultIcon has prefix "Header."

    Author:
    rbair, rah003, Jeanette Winzenburg
    • Constructor Detail

      • BasicHeaderUI

        public BasicHeaderUI()
        Creates a new instance of BasicHeaderUI
    • Method Detail

      • createUI

        public static ComponentUI createUI​(JComponent c)
        Returns an instance of the UI delegate for the specified component. Each subclass must provide its own static createUI method that returns an instance of that UI delegate subclass. If the UI delegate subclass is stateless, it may return an instance that is shared by multiple components. If the UI delegate is stateful, then it should return a new instance per component. The default implementation of this method throws an error, as it should never be invoked.
      • installUI

        public void installUI​(JComponent c)
        Configures the specified component appropriate 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 any 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:
        uninstallUI(javax.swing.JComponent), JComponent.setUI(javax.swing.plaf.ComponentUI), JComponent.updateUI()
      • 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 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:
        installUI(javax.swing.JComponent), JComponent.updateUI()
      • installDefaults

        protected void installDefaults​(JXHeader header)
        Installs default header properties.

        NOTE: this method is called before the children are created, so must not try to access any of those!.

        Parameters:
        header - the header to install.
      • uninstallDefaults

        protected void uninstallDefaults​(JXHeader h)
        Uninstalls the given header's default properties. This implementation does nothing.
        Parameters:
        h - the header to ininstall the properties from.
      • installComponents

        protected void installComponents​(JXHeader header)
        Creates, configures, adds contained components. PRE: header's default properties must be set before calling this.
        Parameters:
        header - the header to install the components into.
      • uninstallComponents

        protected void uninstallComponents​(JXHeader header)
        Unconfigures, removes and nulls contained components.
        Parameters:
        header - the header to install the components into.
      • installComponentDefaults

        protected void installComponentDefaults​(JXHeader header)
        Configures the component default properties from the given header.
        Parameters:
        header - the header to install the components into.
      • uninstallComponentDefaults

        protected void uninstallComponentDefaults​(JXHeader header)
        Uninstalls component defaults. This implementation does nothing.
        Parameters:
        header - the header to uninstall from.
      • installListeners

        protected void installListeners​(JXHeader header)
      • uninstallListeners

        protected void uninstallListeners​(JXHeader h)
      • createBackgroundPainter

        protected Painter createBackgroundPainter()