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java.lang.Objectorg.eclipse.swt.widgets.Widget
org.eclipse.swt.widgets.Control
org.eclipse.swt.widgets.Scrollable
public abstract class Scrollable
This class is the abstract superclass of all classes which represent controls that have standard scroll bars.
IMPORTANT: This class is intended to be subclassed only within the SWT implementation.
Field Summary |
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Fields inherited from class org.eclipse.swt.widgets.Control |
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enableTraverse, internal_parent |
Fields inherited from class org.eclipse.swt.widgets.Widget |
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internal_handle, internal_style |
Constructor Summary | |
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Scrollable(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 | |
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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"). |
ScrollBar |
getHorizontalBar()
Returns the receiver's horizontal scroll bar if it has one, and null if it does not. |
ScrollBar |
getVerticalBar()
Returns the receiver's vertical scroll bar if it has one, and null if it does not. |
protected int |
internal_getNativeStyle()
|
Methods inherited from class org.eclipse.swt.widgets.Widget |
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addDisposeListener, addListener, checkSubclass, checkWidget, getData, getData, getDisplay, getStyle, internal_createHandle, internal_sendEvent, isDisposed, isListening, notifyListeners, removeDisposeListener, removeInternalFilter, removeListener, removeListener, sendEvent, setData, setData, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public Scrollable(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
- SWT.H_SCROLL
,
SWT.V_SCROLL
,
Widget.checkSubclass()
,
Widget.getStyle()
Method Detail |
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public Rectangle computeTrim(int x, int y, int width, int height)
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).
x
- the desired x coordinate of the client areay
- the desired y coordinate of the client areawidth
- the desired width of the client areaheight
- the desired height of the client area
SWTException
- getClientArea()
public Rectangle getClientArea()
SWTException
- computeTrim(int, int, int, int)
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 Control
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 ScrollBar getHorizontalBar()
SWTException
- protected int internal_getNativeStyle()
internal_getNativeStyle
in class Control
public ScrollBar getVerticalBar()
SWTException
-
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