Class DefaultHighlighter

java.lang.Object

javax.swing.text.LayeredHighlighter

javax.swing.text.DefaultHighlighter

All Implemented Interfaces:

Highlighter

Direct Known Subclasses:

BasicTextUI.BasicHighlighter

public class DefaultHighlighter
extends LayeredHighlighter

Implements the Highlighter interfaces. Implements a simple highlight painter that renders in a solid color.

See Also:

• Highlighter

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DefaultHighlighter.DefaultHighlightPainter	Simple highlight painter that fills a highlighted area with a solid color.

Nested classes/interfaces declared in class LayeredHighlighter

LayeredHighlighter.LayerPainter

Nested classes/interfaces declared in interface Highlighter

Highlighter.Highlight, Highlighter.HighlightPainter

Field Summary

Fields

Modifier and Type	Field	Description
static final LayeredHighlighter.LayerPainter	DefaultPainter	Default implementation of LayeredHighlighter.LayerPainter that can be used for painting highlights.

Constructor Summary

Constructors

Constructor	Description
DefaultHighlighter()	Creates a new DefaultHighlighter object.

Method Summary

Modifier and Type	Method	Description
Object	addHighlight(int p0, int p1, Highlighter.HighlightPainter p)	Adds a highlight to the view.
void	changeHighlight(Object tag, int p0, int p1)	Changes a highlight.
void	deinstall(JTextComponent c)	Called when the UI is being removed from the interface of a JTextComponent.
boolean	getDrawsLayeredHighlights()	Return the draw layered highlights.
Highlighter.Highlight[]	getHighlights()	Makes a copy of the 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	paintLayeredHighlights(Graphics g, int p0, int p1, Shape viewBounds, JTextComponent editor, View view)	When leaf Views (such as LabelView) are rendering they should call into this method.
void	removeAllHighlights()	Removes all highlights.
void	removeHighlight(Object tag)	Removes a highlight from the view.
void	setDrawsLayeredHighlights(boolean newValue)	If true, highlights are drawn as the Views draw the text.

Methods declared in class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DefaultPainter

public static final LayeredHighlighter.LayerPainter DefaultPainter

Default implementation of LayeredHighlighter.LayerPainter that can be used for painting highlights.

As of 1.4 this field is final.

Constructor Details

DefaultHighlighter

public DefaultHighlighter()

Creates a new DefaultHighlighter object.

Method Details

paint

public void paint(Graphics g)

Renders the highlights.

Parameters:

g - the graphics context

install

public void install(JTextComponent c)

Called when the UI is being installed into the interface of a JTextComponent. Installs the editor, and removes any existing highlights.

Parameters:

c - the editor component

See Also:

• Highlighter.install(JTextComponent)

deinstall

public void deinstall(JTextComponent c)

Called when the UI is being removed from the interface of a JTextComponent.

Parameters:

c - the component

See Also:

• Highlighter.deinstall(JTextComponent)

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 start offset of the range to highlight >= 0

p1 - the end offset of the range to highlight >= p0

p - the painter to use to actually render the highlight

Returns:

an object that can be used as a tag to refer to the highlight

Throws:

BadLocationException - if the specified location is invalid

removeHighlight

public void removeHighlight(Object tag)

Removes a highlight from the view.

Parameters:

tag - the reference to the highlight

removeAllHighlights

public void removeAllHighlights()

Removes all highlights.

changeHighlight

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

Changes a highlight.

Parameters:

tag - the highlight tag

p0 - the beginning of the range >= 0

p1 - the end of the range >= p0

Throws:

BadLocationException - if the specified location is invalid

getHighlights

public Highlighter.Highlight[] getHighlights()

Makes a copy of the highlights. Does not actually clone each highlight, but only makes references to them.

Returns:

the copy

See Also:

• Highlighter.getHighlights()

paintLayeredHighlights

public void paintLayeredHighlights(Graphics g,
 int p0,
 int p1,
 Shape viewBounds,
 JTextComponent editor,
 View view)

When leaf Views (such as LabelView) are rendering they should call into this method. If a highlight is in the given region it will be drawn immediately.

Specified by:

paintLayeredHighlights in class LayeredHighlighter

Parameters:

g - Graphics used to draw

p0 - starting offset of view

p1 - ending offset of view

viewBounds - Bounds of View

editor - JTextComponent

view - View instance being rendered

setDrawsLayeredHighlights

public void setDrawsLayeredHighlights(boolean newValue)

If true, highlights are drawn as the Views draw the text. That is the Views will call into paintLayeredHighlight which will result in a rectangle being drawn before the text is drawn (if the offsets are in a highlighted region that is). For this to work the painter supplied must be an instance of LayeredHighlightPainter.

Parameters:

newValue - the new value

getDrawsLayeredHighlights

public boolean getDrawsLayeredHighlights()

Return the draw layered highlights.

Returns:

the draw layered highlights