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java.lang.Object org.eclipse.swt.widgets.Widget org.eclipse.swt.widgets.Control org.eclipse.swt.widgets.Scrollable org.eclipse.swt.widgets.Composite org.eclipse.swt.widgets.ExpandBar
public class ExpandBar
Instances of this class support the layout of selectable expand bar items.
The item children that may be added to instances of this class must be of
type ExpandItem
.
IMPORTANT: This class is not intended to be subclassed.
ExpandItem
,
ExpandEvent
,
ExpandListener
,
ExpandAdapter
Constructor Summary | |
---|---|
ExpandBar(Composite parent,
int style)
Constructs a new instance of this class given its parent and a style value describing its behavior and appearance. |
Method Summary | ||
---|---|---|
void |
addExpandListener(ExpandListener listener)
Adds the listener to the collection of listeners who will be notified when an item in the receiver is expanded or collapsed by sending it one of the messages defined in the ExpandListener interface. |
|
protected void |
checkSubclass()
Checks that this class can be subclassed. |
|
Point |
computeSize(int wHint,
int hHint,
boolean changed)
Returns the preferred size of the receiver. |
|
|
getAdapter(java.lang.Class<T> adapter)
Implementation of the Adaptable interface. |
|
ExpandItem |
getItem(int index)
Returns the item at the given, zero-relative index in the receiver. |
|
int |
getItemCount()
Returns the number of items contained in the receiver. |
|
ExpandItem[] |
getItems()
Returns an array of ExpandItem s which are the items in the
receiver. |
|
int |
getSpacing()
Returns the receiver's spacing. |
|
int |
indexOf(ExpandItem item)
Searches the receiver's list starting at the first item (index 0) until an item is found that is equal to the argument, and returns the index of that item. |
|
void |
removeExpandListener(ExpandListener listener)
Removes the listener from the collection of listeners who will be notified when items in the receiver are expanded or collapsed. |
|
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 |
setSpacing(int spacing)
Sets the receiver's spacing. |
Methods inherited from class org.eclipse.swt.widgets.Composite |
---|
changed, getBackgroundMode, getChildren, getLayout, getLayoutDeferred, getTabList, isLayoutDeferred, layout, layout, layout, layout, layout, setBackgroundMode, setFocus, setLayout, setLayoutDeferred, setTabList |
Methods inherited from class org.eclipse.swt.widgets.Scrollable |
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computeTrim, getClientArea, getHorizontalBar, getVerticalBar |
Methods inherited from class org.eclipse.swt.widgets.Widget |
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addDisposeListener, addListener, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, reskin, setData, setData, toString |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
---|
public ExpandBar(Composite parent, int style)
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.
parent
- a composite control which will be the parent of the new
instance (cannot be null)style
- the style of control to construct
java.lang.IllegalArgumentException
- SWTException
- Widget.checkSubclass()
,
Widget.getStyle()
Method Detail |
---|
public void addExpandListener(ExpandListener listener)
ExpandListener
interface.
listener
- the listener which should be notified
java.lang.IllegalArgumentException
- SWTException
- ExpandListener
,
removeExpandListener(org.eclipse.swt.events.ExpandListener)
public void removeExpandListener(ExpandListener listener)
listener
- the listener which should no longer be notified
java.lang.IllegalArgumentException
- SWTException
- ExpandListener
,
addExpandListener(org.eclipse.swt.events.ExpandListener)
public Point computeSize(int wHint, int hHint, boolean changed)
Control
The preferred size of a control is the size that it would
best be displayed at. The width hint and height hint arguments
allow the caller to ask a control questions such as "Given a particular
width, how high does the control 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.
If the changed flag is true
, it indicates that the receiver's
contents have changed, therefore any caches that a layout manager
containing the control may have been keeping need to be flushed. When the
control is resized, the changed flag will be false
, so layout
manager caches can be retained.
computeSize
in class Composite
wHint
- the width hint (can be SWT.DEFAULT
)hHint
- the height hint (can be SWT.DEFAULT
)changed
- true
if the control's contents have changed, and false
otherwise
Layout
,
Control.getBorderWidth()
,
Control.getBounds()
,
Control.getSize()
,
Control.pack(boolean)
,
"computeTrim, getClientArea for controls that implement them"public ExpandItem getItem(int index)
index
- the index of the item to return
java.lang.IllegalArgumentException
- SWTException
- public int getItemCount()
SWTException
- public ExpandItem[] getItems()
ExpandItem
s which are the items in the
receiver.
Note: This is not the actual structure used by the receiver to maintain its list of items, so modifying the array will not affect the receiver.
SWTException
- public int getSpacing()
SWTException
- public int indexOf(ExpandItem item)
item
- the search item
java.lang.IllegalArgumentException
- SWTException
- public void setFont(Font font)
setFont
in class Control
font
- the new font (or null)
java.lang.IllegalArgumentException
- SWTException
- public void setSpacing(int spacing)
SWTException
- protected void checkSubclass()
Widget
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.
checkSubclass
in class Widget
public <T> T getAdapter(java.lang.Class<T> adapter)
Widget
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.
getAdapter
in interface Adaptable
getAdapter
in class Composite
adapter
- the lookup class
null
if
there is no adapter associated with the given class.
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Copyright (c) EclipseSource and others 2002, 2013. All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0