/* Caret.java --
Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
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package javax.swing.text;
import java.awt.Graphics;
import java.awt.Point;
import javax.swing.event.ChangeListener;
/**
* Defines the method to be implemented by a caret that can be used in Swing
* text components.
*
* @author original author unknown
* @author Roman Kennke (roman@kennke.org)
*/
public interface Caret
{
/**
* Registers a {@link ChangeListener} that is notified whenever that state
* of this <code>Caret</code> changes.
*
* @param l the listener to register to this caret
*/
void addChangeListener(ChangeListener l);
/**
* Removes a {@link ChangeListener} from the list of registered listeners.
*
* @param l the listener to remove
*/
void removeChangeListener(ChangeListener l);
/**
* Installs this <code>Caret</code> on the specified text component. This
* usually involves setting up listeners.
*
* This method is called by {@link JTextComponent#setCaret(Caret)} after
* this caret has been set on the text component.
*
* @param c the text component to install this caret to
*/
void install(JTextComponent c);
/**
* Deinstalls this <code>Caret</code> from the specified text component.
* This usually involves removing listeners from the text component.
*
* This method is called by {@link JTextComponent#setCaret(Caret)} before
* this caret is removed from the text component.
*
* @param c the text component to deinstall this caret from
*/
void deinstall(JTextComponent c);
/**
* Returns the blink rate of this <code>Caret</code> in milliseconds.
* A value of <code>0</code> means that the caret does not blink.
*
* @return the blink rate of this <code>Caret</code> or <code>0</code> if
* this caret does not blink
*/
int getBlinkRate();
/**
* Sets the blink rate of this <code>Caret</code> in milliseconds.
* A value of <code>0</code> means that the caret does not blink.
*
* @param rate the new blink rate to set
*/
void setBlinkRate(int rate);
/**
* Returns the current position of this <code>Caret</code> within the
* <code>Document</code>.
*
* @return the current position of this <code>Caret</code> within the
* <code>Document</code>
*/
int getDot();
/**
* Sets the current position of this <code>Caret</code> within the
* <code>Document</code>. This also sets the <code>mark</code> to the
* new location.
*
* @param dot the new position to be set
*
* @see #moveDot(int)
*/
void setDot(int dot);
/**
* Moves the <code>dot</code> location without touching the
* <code>mark</code>. This is used when making a selection.
*
* @param dot the location where to move the dot
*
* @see #setDot(int)
*/
void moveDot(int dot);
/**
* Returns the current position of the <code>mark</code>. The
* <code>mark</code> marks the location in the <code>Document</code> that
* is the end of a selection. If there is no selection, the <code>mark</code>
* is the same as the <code>dot</code>.
*
* @return the current position of the mark
*/
int getMark();
/**
* Returns the current visual position of this <code>Caret</code>.
*
* @return the current visual position of this <code>Caret</code>
*
* @see #setMagicCaretPosition
*/
Point getMagicCaretPosition();
/**
* Sets the current visual position of this <code>Caret</code>.
*
* @param p the Point to use for the saved location. May be <code>null</code>
* to indicate that there is no visual location
*/
void setMagicCaretPosition(Point p);
/**
* Returns <code>true</code> if the selection is currently visible,
* <code>false</code> otherwise.
*
* @return <code>true</code> if the selection is currently visible,
* <code>false</code> otherwise
*/
boolean isSelectionVisible();
/**
* Sets the visiblity state of the selection.
*
* @param v <code>true</code> if the selection should be visible,
* <code>false</code> otherwise
*/
void setSelectionVisible(boolean v);
/**
* Returns <code>true</code> if this <code>Caret</code> is currently visible,
* and <code>false</code> if it is not.
*
* @return <code>true</code> if this <code>Caret</code> is currently visible,
* and <code>false</code> if it is not
*/
boolean isVisible();
/**
* Sets the visibility state of the caret. <code>true</code> shows the
* <code>Caret</code>, <code>false</code> hides it.
*
* @param v the visibility to set
*/
void setVisible(boolean v);
/**
* Paints this <code>Caret</code> to the specified <code>Graphics</code>
* context.
*
* @param g the graphics context to render to
*/
void paint(Graphics g);
}