DefaultCaret (Java Platform SE 8 )
Keywords: javax.swing.text.DefaultCaret class
Date: 2015-05-24

javax.swing.text

## Class DefaultCaret

- java.lang.Object
- - java.awt.geom.RectangularShape
  - - java.awt.geom.Rectangle2D
    - - java.awt.Rectangle
      - - javax.swing.text.DefaultCaret

- All Implemented Interfaces:
    FocusListener, MouseListener, MouseMotionListener, Shape, Serializable, Cloneable, EventListener, Caret
  Direct Known Subclasses:
    BasicTextUI.BasicCaret

      public class DefaultCaret
      extends Rectangle
      implements Caret, FocusListener, MouseListener, MouseMotionListener

  A default implementation of Caret. The caret is rendered as a vertical line in the color specified by the CaretColor property of the associated JTextComponent. It can blink at the rate specified by the BlinkRate property.

  This implementation expects two sources of asynchronous notification. The timer thread fires asynchronously, and causes the caret to simply repaint the most recent bounding box. The caret also tracks change as the document is modified. Typically this will happen on the event dispatch thread as a result of some mouse or keyboard event. The caret behavior on both synchronous and asynchronous documents updates is controlled by `UpdatePolicy` property. The repaint of the new caret location will occur on the event thread in any case, as calls to `modelToView` are only safe on the event thread.

  The caret acts as a mouse and focus listener on the text component it has been installed in, and defines the caret semantics based upon those events. The listener methods can be reimplemented to change the semantics. By default, the first mouse button will be used to set focus and caret position. Dragging the mouse pointer with the first mouse button will sweep out a selection that is contiguous in the model. If the associated text component is editable, the caret will become visible when focus is gained, and invisible when focus is lost.

  The Highlighter bound to the associated text component is used to render the selection by default. Selection appearance can be customized by supplying a painter to use for the highlights. By default a painter is used that will render a solid color as specified in the associated text component in the `SelectionColor` property. This can easily be changed by reimplementing the `getSelectionPainter` method.

  A customized caret appearance can be achieved by reimplementing the paint method. If the paint method is changed, the damage method should also be reimplemented to cause a repaint for the area needed to render the caret. The caret extends the Rectangle class which is used to hold the bounding box for where the caret was last rendered. This enables the caret to repaint in a thread-safe manner when the caret moves without making a call to modelToView which is unstable between model updates and view repair (i.e. the order of delivery to DocumentListeners is not guaranteed).

  The magic caret position is set to null when the caret position changes. A timer is used to determine the new location (after the caret change). When the timer fires, if the magic caret position is still null it is reset to the current caret position. Any actions that change the caret position and want the magic caret position to remain the same, must remember the magic caret position, change the cursor, and then set the magic caret position to its original value. This has the benefit that only actions that want the magic caret position to persist (such as open/down) need to know about it.

  Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans™ has been added to the `java.beans` package. Please see `XMLEncoder`.

  See Also:
    `Caret`

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class java.awt.geom.Rectangle2D

      `Rectangle2D.Double, Rectangle2D.Float`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `ALWAYS_UPDATE` Indicates that the caret position is to be always updated accordingly to the document changes regardless whether the document updates are performed on the Event Dispatching Thread or not.
    `protected ChangeEvent` | `changeEvent` The change event for the model.
    `protected EventListenerList` | `listenerList` The event listener list.
    `static int` | `NEVER_UPDATE` Indicates that the caret should remain at the same absolute position in the document regardless of any document updates, except when the document length becomes less than the current caret position due to removal.
    `static int` | `UPDATE_WHEN_ON_EDT` Indicates that the caret position is to be updated only when document changes are performed on the Event Dispatching Thread.

    - ### Fields inherited from class java.awt.Rectangle

      `height, width, x, y`

    - ### Fields inherited from class java.awt.geom.Rectangle2D

      `OUT_BOTTOM, OUT_LEFT, OUT_RIGHT, OUT_TOP`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DefaultCaret()` Constructs a default caret.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addChangeListener(ChangeListener l)` Adds a listener to track whenever the caret position has been changed.
    `protected void` | `adjustVisibility(Rectangle nloc)` Scrolls the associated view (if necessary) to make the caret visible.
    `protected void` | `damage(Rectangle r)` Damages the area surrounding the caret to cause it to be repainted in a new location.
    `void` | `deinstall(JTextComponent c)` Called when the UI is being removed from the interface of a JTextComponent.
    `boolean` | `equals(Object obj)` Compares this object to the specified object.
    `protected void` | `fireStateChanged()` Notifies all listeners that have registered interest for notification on this event type.
    `void` | `focusGained(FocusEvent e)` Called when the component containing the caret gains focus.
    `void` | `focusLost(FocusEvent e)` Called when the component containing the caret loses focus.
    `int` | `getBlinkRate()` Gets the caret blink rate.
    `ChangeListener[]` | `getChangeListeners()` Returns an array of all the change listeners registered on this caret.
    `protected JTextComponent` | `getComponent()` Gets the text editor component that this caret is is bound to.
    `int` | `getDot()` Fetches the current position of the caret.
    `Position.Bias` | `getDotBias()` Returns the bias of the caret position.
    `<T extends EventListener> T[]` | `getListeners(Class<T> listenerType)` Returns an array of all the objects currently registered as `FooListener`s upon this caret.
    `Point` | `getMagicCaretPosition()` Gets the saved caret position.
    `int` | `getMark()` Fetches the current position of the mark.
    `Position.Bias` | `getMarkBias()` Returns the bias of the mark.
    `protected Highlighter.HighlightPainter` | `getSelectionPainter()` Gets the painter for the Highlighter.
    `int` | `getUpdatePolicy()` Gets the caret movement policy on document updates.
    `void` | `install(JTextComponent c)` Called when the UI is being installed into the interface of a JTextComponent.
    `boolean` | `isActive()` Determines if the caret is currently active.
    `boolean` | `isSelectionVisible()` Checks whether the current selection is visible.
    `boolean` | `isVisible()` Indicates whether or not the caret is currently visible.
    `void` | `mouseClicked(MouseEvent e)` Called when the mouse is clicked.
    `void` | `mouseDragged(MouseEvent e)` Moves the caret position according to the mouse pointer's current location.
    `void` | `mouseEntered(MouseEvent e)` Called when the mouse enters a region.
    `void` | `mouseExited(MouseEvent e)` Called when the mouse exits a region.
    `void` | `mouseMoved(MouseEvent e)` Called when the mouse is moved.
    `void` | `mousePressed(MouseEvent e)` If button 1 is pressed, this is implemented to request focus on the associated text component, and to set the caret position.
    `void` | `mouseReleased(MouseEvent e)` Called when the mouse is released.
    `protected void` | `moveCaret(MouseEvent e)` Tries to move the position of the caret from the coordinates of a mouse event, using viewToModel().
    `void` | `moveDot(int dot)` Moves the caret position to the specified position, with a forward bias.
    `void` | `moveDot(int dot, Position.Bias dotBias)` Moves the caret position to the specified position, with the specified bias.
    `void` | `paint(Graphics g)` Renders the caret as a vertical line.
    `protected void` | `positionCaret(MouseEvent e)` Tries to set the position of the caret from the coordinates of a mouse event, using viewToModel().
    `void` | `removeChangeListener(ChangeListener l)` Removes a listener that was tracking caret position changes.
    `protected void` | `repaint()` Cause the caret to be painted.
    `void` | `setBlinkRate(int rate)` Sets the caret blink rate.
    `void` | `setDot(int dot)` Sets the caret position and mark to the specified position, with a forward bias.
    `void` | `setDot(int dot, Position.Bias dotBias)` Sets the caret position and mark to the specified position, with the specified bias.
    `void` | `setMagicCaretPosition(Point p)` Saves the current caret position.
    `void` | `setSelectionVisible(boolean vis)` Changes the selection visibility.
    `void` | `setUpdatePolicy(int policy)` Sets the caret movement policy on the document updates.
    `void` | `setVisible(boolean e)` Sets the caret visibility, and repaints the caret.
    `String` | `toString()` Returns a `String` representing this `Rectangle` and its values.

    - ### Methods inherited from class java.awt.Rectangle

      `add, add, add, contains, contains, contains, contains, createIntersection, createUnion, getBounds, getBounds2D, getHeight, getLocation, getSize, getWidth, getX, getY, grow, inside, intersection, intersects, isEmpty, move, outcode, reshape, resize, setBounds, setBounds, setLocation, setLocation, setRect, setSize, setSize, translate, union`

    - ### Methods inherited from class java.awt.geom.Rectangle2D

      `add, add, add, contains, contains, getPathIterator, getPathIterator, hashCode, intersect, intersects, intersectsLine, intersectsLine, outcode, setFrame, setRect, union`

    - ### Methods inherited from class java.awt.geom.RectangularShape

      `clone, contains, contains, getCenterX, getCenterY, getFrame, getMaxX, getMaxY, getMinX, getMinY, intersects, setFrame, setFrame, setFrameFromCenter, setFrameFromCenter, setFrameFromDiagonal, setFrameFromDiagonal`

    - ### Methods inherited from class java.lang.Object

      `finalize, getClass, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface java.awt.Shape

      `contains, contains, contains, contains, getPathIterator, getPathIterator, intersects, intersects`

- - ### Field Detail

    - #### UPDATE_WHEN_ON_EDT

          public static final int UPDATE_WHEN_ON_EDT

      Indicates that the caret position is to be updated only when document changes are performed on the Event Dispatching Thread.
      Since:
        1.5
      See Also:
        `setUpdatePolicy(int)`, `getUpdatePolicy()`, Constant Field Values

    - #### NEVER_UPDATE

          public static final int NEVER_UPDATE

      Indicates that the caret should remain at the same absolute position in the document regardless of any document updates, except when the document length becomes less than the current caret position due to removal. In that case the caret position is adjusted to the end of the document.
      Since:
        1.5
      See Also:
        `setUpdatePolicy(int)`, `getUpdatePolicy()`, Constant Field Values

    - #### ALWAYS_UPDATE

          public static final int ALWAYS_UPDATE

      Indicates that the caret position is to be always updated accordingly to the document changes regardless whether the document updates are performed on the Event Dispatching Thread or not.
      Since:
        1.5
      See Also:
        `setUpdatePolicy(int)`, `getUpdatePolicy()`, Constant Field Values

    - #### listenerList

          protected EventListenerList listenerList

      The event listener list.

    - #### changeEvent

          protected transient ChangeEvent changeEvent

      The change event for the model. Only one ChangeEvent is needed per model instance since the event's only (read-only) state is the source property. The source of events generated here is always "this".

  - ### Constructor Detail

    - #### DefaultCaret

          public DefaultCaret()

      Constructs a default caret.

  - ### Method Detail

    - #### setUpdatePolicy

          public void setUpdatePolicy(int policy)

      Sets the caret movement policy on the document updates. Normally the caret updates its absolute position within the document on insertions occurred before or at the caret position and on removals before the caret position. 'Absolute position' means here the position relative to the start of the document. For example if a character is typed within editable text component it is inserted at the caret position and the caret moves to the next absolute position within the document due to insertion and if `BACKSPACE` is typed then caret decreases its absolute position due to removal of a character before it. Sometimes it may be useful to turn off the caret position updates so that the caret stays at the same absolute position within the document position regardless of any document updates.

      The following update policies are allowed:

      - `NEVER_UPDATE`: the caret stays at the same absolute position in the document regardless of any document updates, except when document length becomes less than the current caret position due to removal. In that case caret position is adjusted to the end of the document. The caret doesn't try to keep itself visible by scrolling the associated view when using this policy.
      - `ALWAYS_UPDATE`: the caret always tracks document changes. For regular changes it increases its position if an insertion occurs before or at its current position, and decreases position if a removal occurs before its current position. For undo/redo updates it is always moved to the position where update occurred. The caret also tries to keep itself visible by calling `adjustVisibility` method.
      - `UPDATE_WHEN_ON_EDT`: acts like `ALWAYS_UPDATE` if the document updates are performed on the Event Dispatching Thread and like `NEVER_UPDATE` if updates are performed on other thread.

      The default property value is `UPDATE_WHEN_ON_EDT`.

      Parameters:
        `policy` - one of the following values : `UPDATE_WHEN_ON_EDT`, `NEVER_UPDATE`, `ALWAYS_UPDATE`
      Throws:
        `IllegalArgumentException` - if invalid value is passed
      Since:
        1.5
      See Also:
        `getUpdatePolicy()`, `adjustVisibility(java.awt.Rectangle)`, `UPDATE_WHEN_ON_EDT`, `NEVER_UPDATE`, `ALWAYS_UPDATE`

    - #### getUpdatePolicy

          public int getUpdatePolicy()

      Gets the caret movement policy on document updates.
      Returns:
        one of the following values : `UPDATE_WHEN_ON_EDT`, `NEVER_UPDATE`, `ALWAYS_UPDATE`
      Since:
        1.5
      See Also:
        `setUpdatePolicy(int)`, `UPDATE_WHEN_ON_EDT`, `NEVER_UPDATE`, `ALWAYS_UPDATE`

    - #### getComponent

          protected final JTextComponent getComponent()

      Gets the text editor component that this caret is is bound to.
      Returns:
        the component

    - #### repaint

          protected final void repaint()

      Cause the caret to be painted. The repaint area is the bounding box of the caret (i.e. the caret rectangle or this).

      This method is thread safe, although most Swing methods are not. Please see Concurrency in Swing for more information.

    - #### damage

          protected void damage(Rectangle r)

      Damages the area surrounding the caret to cause it to be repainted in a new location. If paint() is reimplemented, this method should also be reimplemented. This method should update the caret bounds (x, y, width, and height).
      Parameters:
        `r` - the current location of the caret
      See Also:
        `paint(java.awt.Graphics)`

    - #### adjustVisibility

          protected void adjustVisibility(Rectangle nloc)

      Scrolls the associated view (if necessary) to make the caret visible. Since how this should be done is somewhat of a policy, this method can be reimplemented to change the behavior. By default the scrollRectToVisible method is called on the associated component.
      Parameters:
        `nloc` - the new position to scroll to

    - #### getSelectionPainter

          protected Highlighter.HighlightPainter getSelectionPainter()

      Gets the painter for the Highlighter.
      Returns:
        the painter

    - #### positionCaret

          protected void positionCaret(MouseEvent e)

      Tries to set the position of the caret from the coordinates of a mouse event, using viewToModel().
      Parameters:
        `e` - the mouse event

    - #### moveCaret

          protected void moveCaret(MouseEvent e)

      Tries to move the position of the caret from the coordinates of a mouse event, using viewToModel(). This will cause a selection if the dot and mark are different.
      Parameters:
        `e` - the mouse event

    - #### focusGained

          public void focusGained(FocusEvent e)

      Called when the component containing the caret gains focus. This is implemented to set the caret to visible if the component is editable.
      Specified by:
        `focusGained` in interface `FocusListener`
      Parameters:
        `e` - the focus event
      See Also:
        `FocusListener.focusGained(java.awt.event.FocusEvent)`

    - #### focusLost

          public void focusLost(FocusEvent e)

      Called when the component containing the caret loses focus. This is implemented to set the caret to visibility to false.
      Specified by:
        `focusLost` in interface `FocusListener`
      Parameters:
        `e` - the focus event
      See Also:
        `FocusListener.focusLost(java.awt.event.FocusEvent)`

    - #### mouseClicked

          public void mouseClicked(MouseEvent e)

      Called when the mouse is clicked. If the click was generated from button1, a double click selects a word, and a triple click the current line.
      Specified by:
        `mouseClicked` in interface `MouseListener`
      Parameters:
        `e` - the mouse event
      See Also:
        `MouseListener.mouseClicked(java.awt.event.MouseEvent)`

    - #### mousePressed

          public void mousePressed(MouseEvent e)

      If button 1 is pressed, this is implemented to request focus on the associated text component, and to set the caret position. If the shift key is held down, the caret will be moved, potentially resulting in a selection, otherwise the caret position will be set to the new location. If the component is not enabled, there will be no request for focus.
      Specified by:
        `mousePressed` in interface `MouseListener`
      Parameters:
        `e` - the mouse event
      See Also:
        `MouseListener.mousePressed(java.awt.event.MouseEvent)`

    - #### mouseReleased

          public void mouseReleased(MouseEvent e)

      Called when the mouse is released.
      Specified by:
        `mouseReleased` in interface `MouseListener`
      Parameters:
        `e` - the mouse event
      See Also:
        `MouseListener.mouseReleased(java.awt.event.MouseEvent)`

    - #### mouseEntered

          public void mouseEntered(MouseEvent e)

      Called when the mouse enters a region.
      Specified by:
        `mouseEntered` in interface `MouseListener`
      Parameters:
        `e` - the mouse event
      See Also:
        `MouseListener.mouseEntered(java.awt.event.MouseEvent)`

    - #### mouseExited

          public void mouseExited(MouseEvent e)

      Called when the mouse exits a region.
      Specified by:
        `mouseExited` in interface `MouseListener`
      Parameters:
        `e` - the mouse event
      See Also:
        `MouseListener.mouseExited(java.awt.event.MouseEvent)`

    - #### mouseDragged

          public void mouseDragged(MouseEvent e)

      Moves the caret position according to the mouse pointer's current location. This effectively extends the selection. By default, this is only done for mouse button 1.
      Specified by:
        `mouseDragged` in interface `MouseMotionListener`
      Parameters:
        `e` - the mouse event
      See Also:
        `MouseMotionListener.mouseDragged(java.awt.event.MouseEvent)`

    - #### mouseMoved

          public void mouseMoved(MouseEvent e)

      Called when the mouse is moved.
      Specified by:
        `mouseMoved` in interface `MouseMotionListener`
      Parameters:
        `e` - the mouse event
      See Also:
        `MouseMotionListener.mouseMoved(java.awt.event.MouseEvent)`

    - #### paint

          public void paint(Graphics g)

      Renders the caret as a vertical line. If this is reimplemented the damage method should also be reimplemented as it assumes the shape of the caret is a vertical line. Sets the caret color to the value returned by getCaretColor().

      If there are multiple text directions present in the associated document, a flag indicating the caret bias will be rendered. This will occur only if the associated document is a subclass of AbstractDocument and there are multiple bidi levels present in the bidi element structure (i.e. the text has multiple directions associated with it).

      Specified by:
        `paint` in interface `Caret`
      Parameters:
        `g` - the graphics context
      See Also:
        `damage(java.awt.Rectangle)`

    - #### install

          public void install(JTextComponent c)

      Called when the UI is being installed into the interface of a JTextComponent. This can be used to gain access to the model that is being navigated by the implementation of this interface. Sets the dot and mark to 0, and establishes document, property change, focus, mouse, and mouse motion listeners.
      Specified by:
        `install` in interface `Caret`
      Parameters:
        `c` - the component
      See Also:
        `Caret.install(javax.swing.text.JTextComponent)`

    - #### deinstall

          public void deinstall(JTextComponent c)

      Called when the UI is being removed from the interface of a JTextComponent. This is used to unregister any listeners that were attached.
      Specified by:
        `deinstall` in interface `Caret`
      Parameters:
        `c` - the component
      See Also:
        `Caret.deinstall(javax.swing.text.JTextComponent)`

    - #### addChangeListener

          public void addChangeListener(ChangeListener l)

      Adds a listener to track whenever the caret position has been changed.
      Specified by:
        `addChangeListener` in interface `Caret`
      Parameters:
        `l` - the listener
      See Also:
        `Caret.addChangeListener(javax.swing.event.ChangeListener)`

    - #### removeChangeListener

          public void removeChangeListener(ChangeListener l)

      Removes a listener that was tracking caret position changes.
      Specified by:
        `removeChangeListener` in interface `Caret`
      Parameters:
        `l` - the listener
      See Also:
        `Caret.removeChangeListener(javax.swing.event.ChangeListener)`

    - #### getChangeListeners

          public ChangeListener[] getChangeListeners()

      Returns an array of all the change listeners registered on this caret.
      Returns:
        all of this caret's `ChangeListener`s or an empty array if no change listeners are currently registered
      Since:
        1.4
      See Also:
        `addChangeListener(javax.swing.event.ChangeListener)`, `removeChangeListener(javax.swing.event.ChangeListener)`

    - #### fireStateChanged

          protected void fireStateChanged()

      Notifies all listeners that have registered interest for notification on this event type. The event instance is lazily created using the parameters passed into the fire method. The listener list is processed last to first.
      See Also:
        `EventListenerList`

    - #### getListeners

          public <T extends EventListener> T[] getListeners(Class<T> listenerType)

      Returns an array of all the objects currently registered as `FooListener`s upon this caret. `FooListener`s are registered using the `addFooListener` method.

      You can specify the `listenerType` argument with a class literal, such as `FooListener.class`. For example, you can query a `DefaultCaret` `c` for its change listeners with the following code:

          ChangeListener[] cls = (ChangeListener[])(c.getListeners(ChangeListener.class));

      If no such listeners exist, this method returns an empty array.
      Parameters:
        `listenerType` - the type of listeners requested; this parameter should specify an interface that descends from `java.util.EventListener`
      Returns:
        an array of all objects registered as `FooListener`s on this component, or an empty array if no such listeners have been added
      Throws:
        `ClassCastException` - if `listenerType` doesn't specify a class or interface that implements `java.util.EventListener`
      Since:
        1.3
      See Also:
        `getChangeListeners()`

    - #### setSelectionVisible

          public void setSelectionVisible(boolean vis)

      Changes the selection visibility.
      Specified by:
        `setSelectionVisible` in interface `Caret`
      Parameters:
        `vis` - the new visibility

    - #### isSelectionVisible

          public boolean isSelectionVisible()

      Checks whether the current selection is visible.
      Specified by:
        `isSelectionVisible` in interface `Caret`
      Returns:
        true if the selection is visible

    - #### isActive

          public boolean isActive()

      Determines if the caret is currently active.

      This method returns whether or not the `Caret` is currently in a blinking state. It does not provide information as to whether it is currently blinked on or off. To determine if the caret is currently painted use the `isVisible` method.

      Returns:
        `true` if active else `false`
      Since:
        1.5
      See Also:
        `isVisible()`

    - #### isVisible

          public boolean isVisible()

      Indicates whether or not the caret is currently visible. As the caret flashes on and off the return value of this will change between true, when the caret is painted, and false, when the caret is not painted. `isActive` indicates whether or not the caret is in a blinking state, such that it can be visible, and `isVisible` indicates whether or not the caret is actually visible.

      Subclasses that wish to render a different flashing caret should override paint and only paint the caret if this method returns true.

      Specified by:
        `isVisible` in interface `Caret`
      Returns:
        true if visible else false
      See Also:
        `Caret.isVisible()`, `isActive()`

    - #### setVisible

          public void setVisible(boolean e)

      Sets the caret visibility, and repaints the caret. It is important to understand the relationship between this method, `isVisible` and `isActive`. Calling this method with a value of `true` activates the caret blinking. Setting it to `false` turns it completely off. To determine whether the blinking is active, you should call `isActive`. In effect, `isActive` is an appropriate corresponding "getter" method for this one. `isVisible` can be used to fetch the current visibility status of the caret, meaning whether or not it is currently painted. This status will change as the caret blinks on and off.

      Here's a list showing the potential return values of both `isActive` and `isVisible` after calling this method:

      `setVisible(true)`:

      - isActive(): true
      - isVisible(): true or false depending on whether or not the caret is blinked on or off

      `setVisible(false)`:

      - isActive(): false
      - isVisible(): false
      Specified by:
        `setVisible` in interface `Caret`
      Parameters:
        `e` - the visibility specifier
      See Also:
        `isActive()`, `Caret.setVisible(boolean)`

    - #### setBlinkRate

          public void setBlinkRate(int rate)

      Sets the caret blink rate.
      Specified by:
        `setBlinkRate` in interface `Caret`
      Parameters:
        `rate` - the rate in milliseconds, 0 to stop blinking
      See Also:
        `Caret.setBlinkRate(int)`

    - #### getBlinkRate

          public int getBlinkRate()

      Gets the caret blink rate.
      Specified by:
        `getBlinkRate` in interface `Caret`
      Returns:
        the delay in milliseconds. If this is zero the caret will not blink.
      See Also:
        `Caret.getBlinkRate()`

    - #### getDot

          public int getDot()

      Fetches the current position of the caret.
      Specified by:
        `getDot` in interface `Caret`
      Returns:
        the position >= 0
      See Also:
        `Caret.getDot()`

    - #### getMark

          public int getMark()

      Fetches the current position of the mark. If there is a selection, the dot and mark will not be the same.
      Specified by:
        `getMark` in interface `Caret`
      Returns:
        the position >= 0
      See Also:
        `Caret.getMark()`

    - #### setDot

          public void setDot(int dot)

      Sets the caret position and mark to the specified position, with a forward bias. This implicitly sets the selection range to zero.
      Specified by:
        `setDot` in interface `Caret`
      Parameters:
        `dot` - the position >= 0
      See Also:
        `setDot(int, Position.Bias)`, `Caret.setDot(int)`

    - #### moveDot

          public void moveDot(int dot)

      Moves the caret position to the specified position, with a forward bias.
      Specified by:
        `moveDot` in interface `Caret`
      Parameters:
        `dot` - the position >= 0
      See Also:
        `moveDot(int, javax.swing.text.Position.Bias)`, `Caret.moveDot(int)`

    - #### moveDot

          public void moveDot(int dot,
                              Position.Bias dotBias)

      Moves the caret position to the specified position, with the specified bias.
      Parameters:
        `dot` - the position >= 0
        `dotBias` - the bias for this position, not `null`
      Throws:
        `IllegalArgumentException` - if the bias is `null`
      Since:
        1.6
      See Also:
        `Caret.moveDot(int)`

    - #### setDot

          public void setDot(int dot,
                             Position.Bias dotBias)

      Sets the caret position and mark to the specified position, with the specified bias. This implicitly sets the selection range to zero.
      Parameters:
        `dot` - the position >= 0
        `dotBias` - the bias for this position, not `null`
      Throws:
        `IllegalArgumentException` - if the bias is `null`
      Since:
        1.6
      See Also:
        `Caret.setDot(int)`

    - #### getDotBias

          public Position.Bias getDotBias()

      Returns the bias of the caret position.
      Returns:
        the bias of the caret position
      Since:
        1.6

    - #### getMarkBias

          public Position.Bias getMarkBias()

      Returns the bias of the mark.
      Returns:
        the bias of the mark
      Since:
        1.6

    - #### setMagicCaretPosition

          public void setMagicCaretPosition(Point p)

      Saves the current caret position. This is used when caret up/down actions occur, moving between lines that have uneven end positions.
      Specified by:
        `setMagicCaretPosition` in interface `Caret`
      Parameters:
        `p` - the position
      See Also:
        `getMagicCaretPosition()`

    - #### getMagicCaretPosition

          public Point getMagicCaretPosition()

      Gets the saved caret position.
      Specified by:
        `getMagicCaretPosition` in interface `Caret`
      Returns:
        the position see #setMagicCaretPosition
      See Also:
        `Caret.setMagicCaretPosition(java.awt.Point)`

    - #### equals

          public boolean equals(Object obj)

      Compares this object to the specified object. The superclass behavior of comparing rectangles is not desired, so this is changed to the Object behavior.
      Overrides:
        `equals` in class `Rectangle`
      Parameters:
        `obj` - the object to compare this font with
      Returns:
        `true` if the objects are equal; `false` otherwise
      See Also:
        `Object.hashCode()`, `HashMap`

    - #### toString

          public String toString()

      Description copied from class: `Rectangle`
      Returns a `String` representing this `Rectangle` and its values.
      Overrides:
        `toString` in class `Rectangle`
      Returns:
        a `String` representing this `Rectangle` object's coordinate and size values.

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