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Eclipse Platform 2.0 |
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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.Group
Instances of this class provide an etched border with an optional title.
Shadow styles are hints and may not be honoured by the platform. To create a group with the default shadow style for the platform, do not specify a shadow style.
Note: Only one of the above styles may be specified.
IMPORTANT: This class is not intended to be subclassed.
Field Summary |
Fields inherited from class org.eclipse.swt.widgets.Control |
handle |
Constructor Summary | |
Group(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 | |
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. |
Rectangle |
computeTrim(int x,
int y,
int width,
int height)
Given a desired client area for the receiver (as described by the arguments), returns the bounding rectangle which would be required to produce that client area. |
Rectangle |
getClientArea()
Returns a rectangle which describes the area of the receiver which is capable of displaying data (that is, not covered by the "trimmings"). |
String |
getText()
Returns the receiver's text, which is the string that the is used as the title. |
void |
setText(String string)
Sets the receiver's text, which is the string that will be displayed as the receiver's title, to the argument, which may not be null. |
Methods inherited from class org.eclipse.swt.widgets.Composite |
getChildren, getLayout, getTabList, layout, layout, setFocus, setLayout, setTabList |
Methods inherited from class org.eclipse.swt.widgets.Scrollable |
getHorizontalBar, getVerticalBar |
Methods inherited from class org.eclipse.swt.widgets.Widget |
addDisposeListener, addListener, checkWidget, dispose, getData, getData, getStyle, 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 |
public Group(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
IllegalArgumentException
- SWTException
- SWT.SHADOW_ETCHED_IN
,
SWT.SHADOW_ETCHED_OUT
,
SWT.SHADOW_IN
,
SWT.SHADOW_OUT
,
SWT.SHADOW_NONE
,
Widget.checkSubclass()
,
Widget.getStyle()
Method Detail |
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 Composite
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()
,
"computeTrim, getClientArea for controls that implement them"public Rectangle computeTrim(int x, int y, int width, int height)
Scrollable
In other words, it returns a rectangle such that, if the receiver's bounds were set to that rectangle, the area of the receiver which is capable of displaying data (that is, not covered by the "trimmings") would be the rectangle described by the arguments (relative to the receiver's parent).
computeTrim
in class Scrollable
Scrollable.getClientArea()
public Rectangle getClientArea()
Scrollable
getClientArea
in class Scrollable
Scrollable.computeTrim(int, int, int, int)
public String getText()
SWTException
- public void setText(String string)
IllegalArgumentException
- SWTException
-
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Eclipse Platform 2.0 |
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