Module java.desktop
Package javax.swing.text

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

  • Field Details

  • Constructor Details

    • DefaultHighlighter

      public DefaultHighlighter()
      Creates a new DefaultHighlighther 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(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.
      Parameters:
      newValue - the new value

    • getDrawsLayeredHighlights

      public boolean getDrawsLayeredHighlights()
      Return the draw layered highlights.
      Returns:
      the draw layered highlights