Class Scrollable
- java.lang.Object
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- org.eclipse.swt.widgets.Widget
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- org.eclipse.swt.widgets.Control
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- org.eclipse.swt.widgets.Scrollable
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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.
- Since:
- 1.0
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Constructor Summary
Constructors Constructor Description Scrollable(Composite parent, int style)
Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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, addDragDetectListener, addFocusListener, addGestureListener, addHelpListener, addKeyListener, addMenuDetectListener, addMouseListener, addTouchListener, addTraverseListener, computeSize, computeSize, forceFocus, getAccessible, getAdapter, getBackground, getBackgroundImage, getBorderWidth, getBounds, getCursor, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getMonitor, getOrientation, getParent, getShell, getSize, getToolTipText, getTouchEnabled, getVisible, isEnabled, isFocusControl, isReparentable, isVisible, moveAbove, moveBelow, pack, pack, redraw, redraw, removeControlListener, removeDragDetectListener, removeFocusListener, removeGestureListener, removeHelpListener, removeKeyListener, removeMenuDetectListener, removeMouseListener, removeTouchListener, removeTraverseListener, requestLayout, setBackground, setBackgroundImage, setBounds, setBounds, setCursor, setData, setEnabled, setFocus, setFont, setForeground, setLayoutData, setLocation, setLocation, setMenu, setOrientation, setParent, setRedraw, setSize, setSize, setToolTipText, setTouchEnabled, setVisible, toControl, toControl, toDisplay, toDisplay, update
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Methods inherited from class org.eclipse.swt.widgets.Widget
addDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, reskin, setData, toString
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Constructor Detail
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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 theint
"|" operator) two or more of thoseSWT
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:
java.lang.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()
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Method Detail
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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)
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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 areay
- the desired y coordinate of the client areawidth
- the desired width of the client areaheight
- 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()
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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
- Since:
- 1.4
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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
- Since:
- 1.4
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