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## org.eclipse.swt.widgets
Class Sash

    java.lang.Object
      org.eclipse.swt.widgets.Widget
          org.eclipse.swt.widgets.Control
              org.eclipse.swt.widgets.Sash

All Implemented Interfaces:
  Drawable

public class Sash
extends Control

Instances of the receiver represent a selectable user interface object that allows the user to drag a rubber banded outline of the sash within the parent control.

Styles:
  HORIZONTAL, VERTICAL
Events:
  Selection

Note: Only one of the styles HORIZONTAL and VERTICAL may be specified.

IMPORTANT: This class is intended to be subclassed only within the SWT implementation.

Field Summary

Fields inherited from class org.eclipse.swt.widgets.Control
`handle`

Constructor Summary
`Sash(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` | `addSelectionListener(SelectionListener listener)` Adds the listener to the collection of listeners who will be notified when the control is selected, by sending it one of the messages defined in the `SelectionListener` interface.
`Point` | `computeSize(int wHint, int hHint, boolean changed)` Returns the preferred size of the receiver.
`void` | `removeSelectionListener(SelectionListener listener)` Removes the listener from the collection of listeners who will be notified when the control is selected.

Methods inherited from class org.eclipse.swt.widgets.Control
`addControlListener, addFocusListener, addHelpListener, addKeyListener, addMouseListener, addMouseMoveListener, addMouseTrackListener, addPaintListener, addTraverseListener, computeSize, forceFocus, getAccessible, getBackground, getBorderWidth, getBounds, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getMonitor, getParent, getShell, getSize, getToolTipText, getVisible, internal_dispose_GC, internal_new_GC, isEnabled, isFocusControl, isReparentable, isVisible, moveAbove, moveBelow, pack, pack, redraw, redraw, removeControlListener, removeFocusListener, removeHelpListener, removeKeyListener, removeMouseListener, removeMouseMoveListener, removeMouseTrackListener, removePaintListener, removeTraverseListener, setBackground, setBounds, setBounds, setCapture, setCursor, setEnabled, setFocus, setFont, setForeground, setLayoutData, setLocation, setLocation, setMenu, setParent, setRedraw, setSize, setSize, setToolTipText, setVisible, toControl, toControl, toDisplay, toDisplay, traverse, update`

Methods inherited from class org.eclipse.swt.widgets.Widget
`addDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getStyle, isDisposed, 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

### Sash

    public Sash(Composite 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 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.

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:
  `SWT.HORIZONTAL`, `SWT.VERTICAL`, `Widget.checkSubclass()`, `Widget.getStyle()`

Method Detail

### addSelectionListener

    public void addSelectionListener(SelectionListener listener)

  Adds the listener to the collection of listeners who will be notified when the control is selected, by sending it one of the messages defined in the `SelectionListener` interface.

  When `widgetSelected` is called, the x, y, width, and height fields of the event object are valid. If the reciever is being dragged, the event object detail field contains the value `SWT.DRAG`. `widgetDefaultSelected` is not called.

  Parameters:
    `listener` - the listener which should be notified
  Throws:
    `IllegalArgumentException` -
    - ERROR_NULL_ARGUMENT - if the listener is null
    `SWTException` -
    - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  See Also:
    `SelectionListener`, `removeSelectionListener(org.eclipse.swt.events.SelectionListener)`, `SelectionEvent`

### computeSize

    public Point computeSize(int wHint,
                             int hHint,
                             boolean changed)

  Description copied from class: `Control`
  Returns the preferred size of the receiver.

  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.

  Overrides:
    `computeSize` in class `Control`
  Parameters:
    `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
  Returns:
    the preferred size of the control.
  See Also:
    `Layout`, `Control.getBorderWidth()`, `Control.getBounds()`, `Control.getSize()`, `Control.pack()`, "computeTrim, getClientArea for controls that implement them"

### removeSelectionListener

    public void removeSelectionListener(SelectionListener listener)

  Removes the listener from the collection of listeners who will be notified when the control is selected.

  Parameters:
    `listener` - the listener which should be notified
  Throws:
    `IllegalArgumentException` -
    - ERROR_NULL_ARGUMENT - if the listener is null
    `SWTException` -
    - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
    - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  See Also:
    `SelectionListener`, `addSelectionListener(org.eclipse.swt.events.SelectionListener)`

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