Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class DefaultHighlighter - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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javax.swing.text
Class DefaultHighlighter

java.lang.Object
  |
  +--javax.swing.text.LayeredHighlighter
        |
        +--javax.swing.text.DefaultHighlighter

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

Inner Class Summary

static class DefaultHighlighter.DefaultHighlightPainter
          Simple highlight painter that fills a highlighted area with a solid color.

Inner classes inherited from class javax.swing.text.LayeredHighlighter

LayeredHighlighter.LayerPainter

Field Summary

static LayeredHighlighter.LayerPainter DefaultPainter


Constructor Summary

DefaultHighlighter()
          Creates a new DefaultHighlighther object.

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 a highlight.

void deinstall(JTextComponent c)
          Called when the UI is being removed from the interface of a JTextComponent.

boolean getDrawsLayeredHighlights()


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 inherited from class java.lang.Object

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

Field Detail

DefaultPainter

public static LayeredHighlighter.LayerPainter DefaultPainter

Constructor Detail

DefaultHighlighter

public DefaultHighlighter()

Creates a new DefaultHighlighther object.

Method Detail

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
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.

Overrides:: 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()