Package org.eclipse.swt.widgets

Class CoolItem

java.lang.Object

org.eclipse.swt.widgets.Widget

org.eclipse.swt.widgets.Item

org.eclipse.swt.widgets.CoolItem

All Implemented Interfaces:

Adaptable

public class CoolItem
extends Item

Instances of this class are selectable user interface objects that represent the dynamically positionable areas of a CoolBar.

Styles:

DROP_DOWN

Events:

Selection

IMPORTANT: This class is not intended to be subclassed.

Since:

1.0

Constructor Summary

Constructors

Constructor	Description
CoolItem(CoolBar parent, int style)	Constructs a new instance of this class given its parent (which must be a CoolBar) and a style value describing its behavior and appearance.
CoolItem(CoolBar parent, int style, int index)	Constructs a new instance of this class given its parent (which must be a CoolBar), a style value describing its behavior and appearance, and the index at which to place it in the items maintained by its parent.

Method Summary

Modifier and Type	Method	Description
void	addSelectionListener(SelectionListener listener)	Adds the listener to the collection of listeners that will be notified when the control is selected by the user, by sending it one of the messages defined in the SelectionListener interface.
protected void	checkSubclass()	Checks that this class can be subclassed.
Point	computeSize(int wHint, int hHint)	Returns the preferred size of the receiver.
void	dispose()	Disposes of the operating system resources associated with the receiver and all its descendents.
<T> T	getAdapter(Class<T> adapter)	Implementation of the Adaptable interface.
Rectangle	getBounds()	Returns a rectangle describing the receiver's size and location relative to its parent.
Control	getControl()	Returns the control that is associated with the receiver.
Point	getMinimumSize()	Returns the minimum size that the cool item can be resized to using the cool item's gripper.
CoolBar	getParent()	Returns the receiver's parent, which must be a CoolBar.
Point	getPreferredSize()	Returns a point describing the receiver's ideal size.
Point	getSize()	Returns a point describing the receiver's size.
void	removeSelectionListener(SelectionListener listener)	Removes the listener from the collection of listeners that will be notified when the control is selected by the user.
void	setControl(Control control)	Sets the control that is associated with the receiver to the argument.
void	setMinimumSize(int width, int height)	Sets the minimum size that the cool item can be resized to using the cool item's gripper, to the point specified by the arguments.
void	setMinimumSize(Point size)	Sets the minimum size that the cool item can be resized to using the cool item's gripper, to the point specified by the argument.
void	setPreferredSize(int width, int height)	Sets the receiver's ideal size to the point specified by the arguments.
void	setPreferredSize(Point size)	Sets the receiver's ideal size to the point specified by the argument.
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.

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

getImage, getText, setImage, setText

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

addDisposeListener, addListener, checkWidget, getData, getData, getDisplay, getListeners, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, reskin, setData, setData, toString

Methods inherited from class java.lang.Object

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

Constructor Details

CoolItem

public CoolItem(CoolBar parent,
 int style)

Constructs a new instance of this class given its parent (which must be a CoolBar) and a style value describing its behavior and appearance. The item is added to the end of the items maintained by its parent.

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.DROP_DOWN
• Widget.checkSubclass()
• Widget.getStyle()

CoolItem

public CoolItem(CoolBar parent,
 int style,
 int index)

Constructs a new instance of this class given its parent (which must be a CoolBar), a style value describing its behavior and appearance, and the index at which to place it in the items maintained by its parent.

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

index - the zero-relative index at which to store the receiver in its parent

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the parent is null
• ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)

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.DROP_DOWN
• Widget.checkSubclass()
• Widget.getStyle()

Method Details

addSelectionListener

public void addSelectionListener(SelectionListener listener)

Adds the listener to the collection of listeners that will be notified when the control is selected by the user, by sending it one of the messages defined in the SelectionListener interface.

If widgetSelected is called when the mouse is over the drop-down arrow (or 'chevron') portion of the cool item, the event object detail field contains the value SWT.ARROW, and the x and y fields in the event object represent the point at the bottom left of the chevron, where the menu should be popped up. widgetDefaultSelected is not called.

Parameters:

listener - the listener which should be notified when the control is selected by the user

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener 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

See Also:

• SelectionListener
• removeSelectionListener(org.eclipse.swt.events.SelectionListener)
• SelectionEvent

checkSubclass

protected void checkSubclass()

Description copied from class: Widget

Checks that this class can be subclassed.

The SWT class library is intended to be subclassed only at specific, controlled points (most notably, Composite and Canvas when implementing new widgets). This method enforces this rule unless it is overridden.

IMPORTANT: By providing an implementation of this method that allows a subclass of a class which does not normally allow subclassing to be created, the implementer agrees to be fully responsible for the fact that any such subclass will likely fail between SWT releases and will be strongly platform specific. No support is provided for user-written classes which are implemented in this fashion.

The ability to subclass outside of the allowed SWT classes is intended purely to enable those not on the SWT development team to implement patches in order to get around specific limitations in advance of when those limitations can be addressed by the team. Subclassing should not be attempted without an intimate and detailed understanding of the hierarchy.

Overrides:

checkSubclass in class Widget

computeSize

public Point computeSize(int wHint,
 int hHint)

Returns the preferred size of the receiver.

The preferred size of a CoolItem is the size that it would best be displayed at. The width hint and height hint arguments allow the caller to ask the instance questions such as "Given a particular width, how high does it need to be to show all of the contents?" To indicate that the caller does not wish to constrain a particular dimension, the constant SWT.DEFAULT is passed for the hint.

Parameters:

wHint - the width hint (can be SWT.DEFAULT)

hHint - the height hint (can be SWT.DEFAULT)

Returns:

the preferred 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

See Also:

• Layout
• getBounds()
• getSize()
• Control.getBorderWidth()
• Scrollable.computeTrim(int, int, int, int)
• Scrollable.getClientArea()

dispose

public void dispose()

Description copied from class: Widget

Disposes of the operating system resources associated with the receiver and all its descendents. After this method has been invoked, the receiver and all descendents will answer true when sent the message isDisposed(). Any internal connections between the widgets in the tree will have been removed to facilitate garbage collection.

NOTE: This method is not called recursively on the descendents of the receiver. This means that, widget implementers can not detect when a widget is being disposed of by re-implementing this method, but should instead listen for the Dispose event.

Overrides:

dispose in class Widget

See Also:

• Widget.addDisposeListener(org.eclipse.swt.events.DisposeListener)
• Widget.removeDisposeListener(org.eclipse.swt.events.DisposeListener)
• Widget.checkWidget()

getBounds

public Rectangle getBounds()

Returns a rectangle describing the receiver's size and location relative to its parent.

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

getControl

public Control getControl()

Returns the control that is associated with the receiver.

Returns:

the control that is contained by 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

getMinimumSize

public Point getMinimumSize()

Returns the minimum size that the cool item can be resized to using the cool item's gripper.

Returns:

a point containing the minimum width and height of the cool item, in pixels

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 CoolBar getParent()

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

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

getPreferredSize

public Point getPreferredSize()

Returns a point describing the receiver's ideal size. The x coordinate of the result is the ideal width of the receiver. The y coordinate of the result is the ideal height of the receiver.

Returns:

the receiver's ideal 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

getSize

public Point getSize()

Returns a point describing the receiver's size. The x coordinate of the result is the width of the receiver. The y coordinate of the result is the height of the receiver.

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

removeSelectionListener

public void removeSelectionListener(SelectionListener listener)

Removes the listener from the collection of listeners that will be notified when the control is selected by the user.

Parameters:

listener - the listener which should no longer be notified

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener 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

See Also:

• SelectionListener
• addSelectionListener(org.eclipse.swt.events.SelectionListener)

setControl

public void setControl(Control control)

Sets the control that is associated with the receiver to the argument.

Parameters:

control - the new control that will be contained by the receiver

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the control has been disposed
• ERROR_INVALID_PARENT - if the control is not in the same widget tree

SWTException -

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

setMinimumSize

public void setMinimumSize(int width,
 int height)

Sets the minimum size that the cool item can be resized to using the cool item's gripper, to the point specified by the arguments.

Parameters:

width - the minimum width of the cool item, in pixels

height - the minimum height of the cool item, in pixels

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

setMinimumSize

public void setMinimumSize(Point size)

Sets the minimum size that the cool item can be resized to using the cool item's gripper, to the point specified by the argument.

Parameters:

size - a point representing the minimum width and height of the cool item, in pixels

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

setPreferredSize

public void setPreferredSize(int width,
 int height)

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

Parameters:

width - the new ideal width for the receiver

height - the new ideal 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

setPreferredSize

public void setPreferredSize(Point size)

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

Parameters:

size - the new ideal size 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

setSize

public void setSize(int width,
 int height)

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

Note: Attempting to set the width or height of the receiver to a negative number will cause that value to be set to zero instead.

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.

Note: Attempting to set the width or height of the receiver to a negative number will cause them to be set to zero instead.

Parameters:

size - the new size 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

getAdapter

public <T> T getAdapter(Class<T> adapter)

Description copied from class: Widget

Implementation of the Adaptable interface.

IMPORTANT: This method is not part of the RWT public API. It is marked public only so that it can be shared within the packages provided by RWT. It should never be accessed from application code.

Specified by:

getAdapter in interface Adaptable

Overrides:

getAdapter in class Widget

Parameters:

adapter - the lookup class

Returns:

an object that can be cast to the given class or null if there is no adapter associated with the given class.