javax.swing.text
Interface Highlighter

All Known Implementing Classes:

LayeredHighlighter

public interface Highlighter

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

Author:

Timothy Prinzing

Nested Class Summary

static interface	Highlighter.Highlight
static interface	Highlighter.HighlightPainter Highlight renderer.

Method Summary

Object	addHighlight(int p0, int p1, Highlighter.HighlightPainter p) Adds a highlight to the view.
void	changeHighlight(Object tag, int p0, int p1) Changes the given highlight to span a different portion of the document.
void	deinstall(JTextComponent c) Called when the UI is being removed from the interface of a JTextComponent.
Highlighter.Highlight[]	getHighlights() Fetches the current list of highlights.
void	install(JTextComponent c) Called when the UI is being installed into the interface of a JTextComponent.
void	paint(Graphics g) Renders the highlights.
void	removeAllHighlights() Removes all highlights this highlighter is responsible for.
void	removeHighlight(Object tag) Removes a highlight from the view.

Method Detail

install

public void install(JTextComponent c)

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.

Parameters:

c - the JTextComponent editor

deinstall

public void deinstall(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.

Parameters:

c - the JTextComponent editor

paint

public void paint(Graphics g)

Renders the highlights.

Parameters:

g - the graphics context.

addHighlight

public Object addHighlight(int p0,
                           int p1,
                           Highlighter.HighlightPainter p)
                    throws BadLocationException

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

Parameters:

p0 - the beginning of the range >= 0

p1 - the end of the range >= p0

p - the painter to use for the actual highlighting

Returns:

an object that refers to the highlight

Throws:

BadLocationException - for an invalid range specification

removeHighlight

public void removeHighlight(Object tag)

Removes a highlight from the view.

Parameters:

tag - which highlight to remove

removeAllHighlights

public void removeAllHighlights()

Removes all highlights this highlighter is responsible for.

changeHighlight

public void changeHighlight(Object tag,
                            int p0,
                            int p1)
                     throws BadLocationException

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.

Parameters:

tag - which highlight to change

p0 - the beginning of the range >= 0

p1 - the end of the range >= p0

Throws:

BadLocationException - for an invalid range specification

getHighlights

public Highlighter.Highlight[] getHighlights()

Fetches the current list of highlights.

Returns:

the highlight list