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Eclipse Platform
Release 3.0

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org.eclipse.swt.widgets
Class Scrollable

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

All Implemented Interfaces:

Drawable

Direct Known Subclasses:

Composite, List, Text

public abstract class Scrollable

extends Control

This class is the abstract superclass of all classes which represent controls that have standard scroll bars.

Styles:

H_SCROLL, V_SCROLL

Events:

(none)

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

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

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.

Methods inherited from class org.eclipse.swt.widgets.Control

addControlListener, addFocusListener, addHelpListener, addKeyListener, addMouseListener, addMouseMoveListener, addMouseTrackListener, addPaintListener, addTraverseListener, computeSize, 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

Scrollable

public Scrollable(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.H_SCROLL, SWT.V_SCROLL, Widget.checkSubclass(), Widget.getStyle()

Method Detail

computeTrim

public 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.

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).

Parameters:

x - the desired x coordinate of the client area

y - the desired y coordinate of the client area

width - the desired width of the client area

height - the desired height of the client area

Returns:

the required bounds to produce the given client area

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

See Also:

getClientArea()

getClientArea

public 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").

Returns:

the client area

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

See Also:

computeTrim(int, int, int, int)

getHorizontalBar

public ScrollBar getHorizontalBar()

Returns the receiver's horizontal scroll bar if it has one, and null if it does not.

Returns:

the horizontal scroll bar (or null)

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

getVerticalBar

public ScrollBar getVerticalBar()

Returns the receiver's vertical scroll bar if it has one, and null if it does not.

Returns:

the vertical scroll bar (or null)

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