Class ExpandItem
- Styles:
- (none)
- Events:
- (none)
IMPORTANT: This class is not intended to be subclassed.
- Since:
- 3.2
- See Also:
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Field Summary
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Constructor Summary
ConstructorsConstructorDescriptionExpandItem
(ExpandBar parent, int style) Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.ExpandItem
(ExpandBar parent, int style, int index) Constructs a new instance of this class given its parent, 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 TypeMethodDescriptionprotected void
Checks that this class can be subclassed.Returns the control that is shown when the item is expanded.boolean
Returnstrue
if the receiver is expanded, and false otherwise.int
Returns the height of the receiver's headerint
Gets the height of the receiver.Returns the receiver's parent, which must be aExpandBar
.void
setControl
(Control control) Sets the control that is shown when the item is expanded.void
setExpanded
(boolean expanded) Sets the expanded state of the receiver.void
setHeight
(int height) Sets the height of the receiver.void
Sets the receiver's image to the argument, which may be null indicating that no image should be displayed.void
Sets the receiver's text.Methods inherited from class org.eclipse.swt.widgets.Widget
addDisposeListener, addListener, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isAutoDirection, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, reskin, setData, setData, toString
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Constructor Details
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ExpandItem
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 theint
"|" operator) two or more of thoseSWT
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:
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ExpandItem
Constructs a new instance of this class given its parent, 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 theint
"|" operator) two or more of thoseSWT
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 constructindex
- the zero-relative index 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:
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Method Details
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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
andCanvas
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 classItem
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getControl
Returns the control that is shown when the item is expanded. If no control has been set, returnnull
.- Returns:
- the control
- 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
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getExpanded
public boolean getExpanded()Returnstrue
if the receiver is expanded, and false otherwise.- Returns:
- the expanded 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
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getHeaderHeight
public int getHeaderHeight()Returns the height of the receiver's header- Returns:
- the height of the header
- 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
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getHeight
public int getHeight()Gets the height of the receiver.- Returns:
- the height
- 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
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getParent
Returns the receiver's parent, which must be aExpandBar
.- 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
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setControl
Sets the control that is shown when the item is expanded.- Parameters:
control
- the new control (or null)- 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
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setExpanded
public void setExpanded(boolean expanded) Sets the expanded state of the receiver.- Parameters:
expanded
- the new expanded 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
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setHeight
public void setHeight(int height) Sets the height of the receiver. This is height of the item when it is expanded, excluding the height of the header.- Parameters:
height
- the new height- 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
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setImage
Description copied from class:Item
Sets the receiver's image to the argument, which may be null indicating that no image should be displayed. -
setText
Description copied from class:Item
Sets the receiver's text.Note: If control characters like '\n', '\t' etc. are used in the string, then the behavior is platform dependent.
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