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 Classes

Nested Classes

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

Nested classes/interfaces inherited from class javax.swing.text.LayeredHighlighter

LayeredHighlighter.LayerPainter

Nested classes/interfaces inherited from interface javax.swing.text.Highlighter

Highlighter.Highlight, Highlighter.HighlightPainter

Fields

DefaultPainter

public static final LayeredHighlighter.LayerPainter DefaultPainter

Constructors

DefaultHighlighter

public DefaultHighlighter()

Creates a new DefaultHighlighther object.

Methods

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(javax.swing.text.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(javax.swing.text.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.

getDrawsLayeredHighlights

public boolean getDrawsLayeredHighlights()