Class ExpandItem
- java.lang.Object
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- org.eclipse.swt.widgets.Widget
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- org.eclipse.swt.widgets.Item
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- org.eclipse.swt.widgets.ExpandItem
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- All Implemented Interfaces:
Adaptable
public class ExpandItem extends Item
Instances of this class represent a selectable user interface object that represents a expandable item in a expand bar.- Styles:
- (none)
- Events:
- (none)
IMPORTANT: This class is not intended to be subclassed.
- Since:
- 1.2
- See Also:
ExpandBar
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Constructor Summary
Constructors Constructor Description ExpandItem(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.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
dispose()
Disposes of the operating system resources associated with the receiver and all its descendents.<T> T
getAdapter(java.lang.Class<T> adapter)
Implementation of theAdaptable
interface.Control
getControl()
Returns the control that is shown when the item is expanded.boolean
getExpanded()
Returnstrue
if the receiver is expanded, and false otherwise.int
getHeaderHeight()
Returns the height of the receiver's headerint
getHeight()
Gets the height of the receiver.ExpandBar
getParent()
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
setImage(Image image)
Sets the receiver's image to the argument, which may be null indicating that no image should be displayed.void
setText(java.lang.String string)
Sets the receiver's text.-
Methods inherited from class org.eclipse.swt.widgets.Widget
addDisposeListener, addListener, checkSubclass, checkWidget, getData, getData, getDisplay, getListeners, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, reskin, setData, setData, toString
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Constructor Detail
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ExpandItem
public ExpandItem(ExpandBar 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 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:
java.lang.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:
Widget.checkSubclass()
,Widget.getStyle()
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ExpandItem
public 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.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:
java.lang.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:
Widget.checkSubclass()
,Widget.getStyle()
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Method Detail
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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 answertrue
when sent the messageisDisposed()
. 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.
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getControl
public Control 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
public ExpandBar 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
public void setControl(Control control)
Sets the control that is shown when the item is expanded.- Parameters:
control
- the new control (or null)- Throws:
java.lang.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
public void setImage(Image image)
Description copied from class:Item
Sets the receiver's image to the argument, which may be null indicating that no image should be displayed.
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setText
public void setText(java.lang.String string)
Description copied from class:Item
Sets the receiver's text.
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getAdapter
public <T> T getAdapter(java.lang.Class<T> adapter)
Description copied from class:Widget
Implementation of theAdaptable
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 interfaceAdaptable
- Overrides:
getAdapter
in classWidget
- 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.
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