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package javax.swing.text;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Shape;


An interface for an object that allows one to mark up the background
with colored areas.

Author: Timothy Prinzing
/**
 * An interface for an object that allows one to mark up the background
 * with colored areas.
 *
 * @author  Timothy Prinzing
 */
public interface Highlighter {

    
Called when the UI is being installed into the
interface of a JTextComponent.  This can be used
to gain access to the model that is being navigated
by the implementation of this interface.

Params:
  • c – the JTextComponent editor
/**
     * Called when the UI is being installed into the
     * interface of a JTextComponent.  This can be used
     * to gain access to the model that is being navigated
     * by the implementation of this interface.
     *
     * @param c the JTextComponent editor
     */
    public void install(JTextComponent c);

    
Called when the UI is being removed from the
interface of a JTextComponent.  This is used to
unregister any listeners that were attached.

Params:
  • c – the JTextComponent editor
/**
     * Called when the UI is being removed from the
     * interface of a JTextComponent.  This is used to
     * unregister any listeners that were attached.
     *
     * @param c the JTextComponent editor
     */
    public void deinstall(JTextComponent c);

    
Renders the highlights.

Params:
  • g – the graphics context.
/**
     * Renders the highlights.
     *
     * @param g the graphics context.
     */
    public void paint(Graphics g);

    
Adds a highlight to the view.  Returns a tag that can be used
to refer to the highlight.

Params:
  • p0 – the beginning of the range >= 0
  • p1 – the end of the range >= p0
  • p – the painter to use for the actual highlighting
Throws:
Returns:an object that refers to the highlight
/**
     * Adds a highlight to the view.  Returns a tag that can be used
     * to refer to the highlight.
     *
     * @param p0 the beginning of the range >= 0
     * @param p1 the end of the range >= p0
     * @param p the painter to use for the actual highlighting
     * @return an object that refers to the highlight
     * @exception BadLocationException for an invalid range specification
     */
    public Object addHighlight(int p0, int p1, HighlightPainter p) throws BadLocationException;

    
Removes a highlight from the view.

Params:
  • tag –  which highlight to remove
/**
     * Removes a highlight from the view.
     *
     * @param tag  which highlight to remove
     */
    public void removeHighlight(Object tag);

    
Removes all highlights this highlighter is responsible for.

/**
     * Removes all highlights this highlighter is responsible for.
     */
    public void removeAllHighlights();

    
Changes the given highlight to span a different portion of
the document.  This may be more efficient than a remove/add
when a selection is expanding/shrinking (such as a sweep
with a mouse) by damaging only what changed.

Params:
  • tag –  which highlight to change
  • p0 – the beginning of the range >= 0
  • p1 – the end of the range >= p0
Throws:
/**
     * Changes the given highlight to span a different portion of
     * the document.  This may be more efficient than a remove/add
     * when a selection is expanding/shrinking (such as a sweep
     * with a mouse) by damaging only what changed.
     *
     * @param tag  which highlight to change
     * @param p0 the beginning of the range >= 0
     * @param p1 the end of the range >= p0
     * @exception BadLocationException for an invalid range specification
     */
    public void changeHighlight(Object tag, int p0, int p1) throws BadLocationException;

    
Fetches the current list of highlights.

Returns:the highlight list
/**
     * Fetches the current list of highlights.
     *
     * @return the highlight list
     */
    public Highlight[] getHighlights();

    
Highlight renderer.

/**
     * Highlight renderer.
     */
    public interface HighlightPainter {

        
Renders the highlight.

Params:
  • g – the graphics context
  • p0 – the starting offset in the model >= 0
  • p1 – the ending offset in the model >= p0
  • bounds – the bounding box for the highlight
  • c – the editor
/**
         * Renders the highlight.
         *
         * @param g the graphics context
         * @param p0 the starting offset in the model >= 0
         * @param p1 the ending offset in the model >= p0
         * @param bounds the bounding box for the highlight
         * @param c the editor
         */
        public void paint(Graphics g, int p0, int p1, Shape bounds, JTextComponent c);

    }

    
A highlight.

/**
     * A highlight.
     */
    public interface Highlight {

        
Gets the starting model offset for the highlight.

Returns:the starting offset >= 0
/**
         * Gets the starting model offset for the highlight.
         *
         * @return the starting offset >= 0
         */
        public int getStartOffset();

        
Gets the ending model offset for the highlight.

Returns:the ending offset >= 0
/**
         * Gets the ending model offset for the highlight.
         *
         * @return the ending offset >= 0
         */
        public int getEndOffset();

        
Gets the painter for the highlighter.

Returns:the painter
/**
         * Gets the painter for the highlighter.
         *
         * @return the painter
         */
        public HighlightPainter getPainter();

    }
};