Package org.jdesktop.swingx.decorator

Class PainterHighlighter

java.lang.Object
org.jdesktop.swingx.decorator.AbstractHighlighter
org.jdesktop.swingx.decorator.PainterHighlighter
All Implemented Interfaces:
Highlighter
public class PainterHighlighter extends AbstractHighlighter
Highlighter implementation which uses a Painter to decorate the component.

As Painter implementations can be mutable and Highlighters have the responsibility to notify their own listeners about any changes which might effect the visuals, this class provides api to install/uninstall a listener to the painter, as appropriate. It takes care of Painters of type AbstractHighlighter by registering a PropertyChangeListener. Subclasses might override to correctly handle different types as well.

Subclasses might be implemented to change the Painter during the decoration process, which must not passed-on to the Highlighter's listeners. The default routing is controlled by a flag isAdjusting. This is set/reset in this implementation's highlight method to ease subclass' burden (and to keep backward compatibility with implementations preceding the introduction of the painter listener). That is, subclasses are free to change painter properties during the decoration.

As an example, a ValueBasedPainterHighlighter might safely change any painter property to decorate a component depending on content. 


 @Override
 protected Component doHighlight(Component renderer, ComponentAdapter adapter) {
      float end = getEndOfGradient((Number) adapter.getValue());
      RelativePainter painter = (RelativePainter) getPainter();
      painter.setXFraction(end);
      ((PainterAware) renderer).setPainter(painter);
      return renderer;
 }
 
 @Override
 protected boolean canHighlight(Component renderer, ComponentAdapter adapter) {
     return super.canHighlight(renderer, adapter) &&
        (adapter.getValue() instanceof Number);
 }
NOTE: this will change once the Painter api is stable.
Author:
Jeanette Winzenburg

  • Constructor Details

    • PainterHighlighter

      public PainterHighlighter()
      Instantiates a PainterHighlighter with null painter and default predicate.

    • PainterHighlighter

      public PainterHighlighter(HighlightPredicate predicate)
      Instantiates a PainterHighlighter with null painter which uses the given predicate.
      Parameters:
      predicate - the HighlightPredicate which controls the highlight application.

    • PainterHighlighter

      public PainterHighlighter(Painter<?> painter)
      Instantiates a PainterHighlighter with the given Painter and default predicate.
      Parameters:
      painter - the painter to use

    • PainterHighlighter

      public PainterHighlighter(HighlightPredicate predicate, Painter<?> painter)
      Instantiates a PainterHighlighter with the given painter and predicate.
      Parameters:
      predicate -
      painter -

  • Method Details

    • getPainter

      public Painter<?> getPainter()
      Returns to Painter used in this Highlighter.
      Returns:
      the Painter used in this Highlighter, may be null.

    • setPainter

      public void setPainter(Painter<?> painter)
      Sets the Painter to use in this Highlighter, may be null. Un/installs the listener to changes painter's properties.
      Parameters:
      painter - the Painter to uses for decoration.

    • installPainterListener

      protected void installPainterListener()
      Installs a listener to the painter if appropriate. This implementation registers its painterListener if the Painter is of type AbstractPainter.

    • uninstallPainterListener

      protected void uninstallPainterListener()
      Uninstalls a listener from the painter if appropriate. This implementation removes its painterListener if the Painter is of type AbstractPainter.

    • getPainterListener

      protected final PropertyChangeListener getPainterListener()
      Lazyly creates and returns the property change listener used to listen to changes of the painter.
      Returns:
      the property change listener used to listen to changes of the painter.

    • createPainterListener

      protected PropertyChangeListener createPainterListener()
      Creates and returns the property change listener used to listen to changes of the painter.

      This implementation fires a stateChanged on receiving any propertyChange, if the isAdjusting flag is false. Otherwise does nothing.

      Returns:
      the property change listener used to listen to changes of the painter.

    • highlight

      public Component highlight(Component component, ComponentAdapter adapter)
      Decorates the specified component for the given component adapter. This calls doHighlight to apply the decoration if both HighlightPredicate isHighlighted and canHighlight return true. Returns the undecorated component otherwise.

      Overridden to set/reset the flag indicating whether or not painter's property changes should be passed on to the Highlighter's listener.

      Specified by:
      highlight in interface Highlighter
      Overrides:
      highlight in class AbstractHighlighter
      Parameters:
      component - the cell renderer component that is to be decorated
      adapter - the ComponentAdapter for this decorate operation
      Returns:
      the decorated cell rendering component
      See Also:

    • doHighlight

      protected Component doHighlight(Component component, ComponentAdapter adapter)
      Apply the highlights.

      This implementation sets the painter if it is not null. Does nothing otherwise.

      Specified by:
      doHighlight in class AbstractHighlighter
      Parameters:
      component - the cell renderer component that is to be decorated
      adapter - the ComponentAdapter for this decorate operation
      Returns:
      Component component
      See Also:

    • canHighlight

      protected boolean canHighlight(Component component, ComponentAdapter adapter)
      Subclasses may override to further limit the highlighting based on Highlighter state, f.i. a PainterHighlighter can only be applied to PainterAware components.

      This implementation returns true always.

      Overridden to return false if the Painter is null or the component is not of type PainterAware.

      Overrides:
      canHighlight in class AbstractHighlighter
      Parameters:
      component - the cell renderer component that is to be decorated
      adapter - a Component Adapter
      Returns:
      a boolean indication if the adapter can be highlighted based general state. This implementation returns true always.