org.eclipse.swt.widgets
Class Caret

java.lang.Object
  |
  +--org.eclipse.swt.widgets.Widget
        |
        +--org.eclipse.swt.widgets.Caret

public class Caret

extends Widget

Instances of this class provide an i-beam that is typically used as the insertion point for text.

Styles:

(none)

Events:

(none)

IMPORTANT: This class is intended to be subclassed only within the SWT implementation.

Constructor Summary

Caret(Canvas parent, int style)
Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.

Method Summary

Rectangle	getBounds() Returns a rectangle describing the receiver's size and location relative to its parent (or its display if its parent is null).
Display	getDisplay() Returns the Display that is associated with the receiver.
Font	getFont() Returns the font that the receiver will use to paint textual information.
Image	getImage() Returns the image that the receiver will use to paint the caret.
Point	getLocation() Returns a point describing the receiver's location relative to its parent (or its display if its parent is null).
Canvas	getParent() Returns the receiver's parent, which must be a Canvas.
Point	getSize() Returns a point describing the receiver's size.
boolean	getVisible() Returns true if the receiver is visible, and false otherwise.
boolean	isVisible() Returns true if the receiver is visible and all of the receiver's ancestors are visible and false otherwise.
void	setBounds(int x, int y, int width, int height) Sets the receiver's size and location to the rectangular area specified by the arguments.
void	setBounds(Rectangle rect) Sets the receiver's size and location to the rectangular area specified by the argument.
void	setFont(Font font) Sets the font that the receiver will use to paint textual information to the font specified by the argument, or to the default font for that kind of control if the argument is null.
void	setImage(Image image) Sets the image that the receiver will use to paint the caret to the image specified by the argument, or to the default which is a filled rectangle if the argument is null
void	setLocation(int x, int y) Sets the receiver's location to the point specified by the arguments which are relative to the receiver's parent (or its display if its parent is null).
void	setLocation(Point location) Sets the receiver's location to the point specified by the argument which is relative to the receiver's parent (or its display if its parent is null).
void	setSize(int width, int height) Sets the receiver's size to the point specified by the arguments.
void	setSize(Point size) Sets the receiver's size to the point specified by the argument.
void	setVisible(boolean visible) Marks the receiver as visible if the argument is true, and marks it invisible otherwise.

Methods inherited from class org.eclipse.swt.widgets.Widget

addDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, setData, setData, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Caret

public Caret(Canvas parent,
             int style)

Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.

The style value is either one of the style constants defined in class SWT which is applicable to instances of this class, or must be built by bitwise OR'ing together (that is, using the int "|" operator) two or more of those SWT style constants. The class description lists the style constants that are applicable to the class. Style bits are also inherited from superclasses.

Parameters:

parent - a composite control which will be the parent of the new instance (cannot be null)

style - the style of control to construct

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the parent is null

SWTException -

• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
• ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass

See Also:

SWT, Widget.checkSubclass(), Widget.getStyle()

Method Detail

getBounds

public Rectangle getBounds()

Returns a rectangle describing the receiver's size and location relative to its parent (or its display if its parent is null).

Returns:

the receiver's bounding rectangle

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getDisplay

public Display getDisplay()

Description copied from class: Widget

Returns the Display that is associated with the receiver.

A widget's display is either provided when it is created (for example, top level Shells) or is the same as its parent's display.

Specified by:

getDisplay in class Widget

Returns:

the receiver's display

getFont

public Font getFont()

Returns the font that the receiver will use to paint textual information.

Returns:

the receiver's font

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getImage

public Image getImage()

Returns the image that the receiver will use to paint the caret.

Returns:

the receiver's image

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getLocation

public Point getLocation()

Returns a point describing the receiver's location relative to its parent (or its display if its parent is null).

Returns:

the receiver's location

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getParent

public Canvas getParent()

Returns the receiver's parent, which must be a Canvas.

Returns:

the receiver's parent

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getSize

public Point getSize()

Returns a point describing the receiver's size.

Returns:

the receiver's size

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getVisible

public boolean getVisible()

Returns true if the receiver is visible, and false otherwise.

If one of the receiver's ancestors is not visible or some other condition makes the receiver not visible, this method may still indicate that it is considered visible even though it may not actually be showing.

Returns:

the receiver's visibility state

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

isVisible

public boolean isVisible()

Returns true if the receiver is visible and all of the receiver's ancestors are visible and false otherwise.

Returns:

the receiver's visibility state

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

See Also:

getVisible()

setBounds

public void setBounds(int x,
                      int y,
                      int width,
                      int height)

Sets the receiver's size and location to the rectangular area specified by the arguments. The x and y arguments are relative to the receiver's parent (or its display if its parent is null).

Parameters:

x - the new x coordinate for the receiver

y - the new y coordinate for the receiver

width - the new width for the receiver

height - the new height for the receiver

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setBounds

public void setBounds(Rectangle rect)

Sets the receiver's size and location to the rectangular area specified by the argument. The x and y fields of the rectangle are relative to the receiver's parent (or its display if its parent is null).

Parameters:

rect - the new bounds for the receiver

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setFont

public void setFont(Font font)

Sets the font that the receiver will use to paint textual information to the font specified by the argument, or to the default font for that kind of control if the argument is null.

Parameters:

font - the new font (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the font has been disposed

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setImage

public void setImage(Image image)

Sets the image that the receiver will use to paint the caret to the image specified by the argument, or to the default which is a filled rectangle if the argument is null

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the image has been disposed

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setLocation

public void setLocation(int x,
                        int y)

Sets the receiver's location to the point specified by the arguments which are relative to the receiver's parent (or its display if its parent is null).

Parameters:

x - the new x coordinate for the receiver

y - the new y coordinate for the receiver

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setLocation

public void setLocation(Point location)

Sets the receiver's location to the point specified by the argument which is relative to the receiver's parent (or its display if its parent is null).

Parameters:

location - the new location for the receiver

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setSize

public void setSize(int width,
                    int height)

Sets the receiver's size to the point specified by the arguments.

Parameters:

width - the new width for the receiver

height - the new height for the receiver

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setSize

public void setSize(Point size)

Sets the receiver's size to the point specified by the argument.

Parameters:

size - the new extent for the receiver

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the point is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setVisible

public void setVisible(boolean visible)

Marks the receiver as visible if the argument is true, and marks it invisible otherwise.

If one of the receiver's ancestors is not visible or some other condition makes the receiver not visible, marking it visible may not actually cause it to be displayed.

Parameters:

visible - the new visibility state

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver