Class Scale
- 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.
- Since:
- 1.2
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Constructor SummaryConstructors
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Method SummaryModifier and TypeMethodDescriptionvoidaddSelectionListener(SelectionListener listener) Adds the listener to the collection of listeners who will be notified when the user changes the receiver's value, by sending it one of the messages defined in theSelectionListenerinterface.computeSize(int wHint, int hHint, boolean changed) Returns the preferred size of the receiver.<T> TgetAdapter(Class<T> adapter) Implementation of theAdaptableinterface.intReturns the amount that the receiver's value will be modified by when the up/down (or right/left) arrows are pressed.intReturns the maximum value which the receiver will allow.intReturns the minimum value which the receiver will allow.intReturns the amount that the receiver's value will be modified by when the page increment/decrement areas are selected.intReturns the 'selection', which is the receiver's position.voidremoveSelectionListener(SelectionListener listener) Removes the listener from the collection of listeners who will be notified when the user changes the receiver's value.voidsetIncrement(int increment) Sets the amount that the receiver's value will be modified by when the up/down (or right/left) arrows are pressed to the argument, which must be at least one.voidsetMaximum(int maximum) Sets the maximum value that the receiver will allow.voidsetMinimum(int minimum) Sets the minimum value that the receiver will allow.voidsetPageIncrement(int pageIncrement) Sets the amount that the receiver's value will be modified by when the page increment/decrement areas are selected to the argument, which must be at least one.voidsetSelection(int selection) Sets the 'selection', which is the receiver's value, to the argument which must be greater than or equal to zero.Methods inherited from class org.eclipse.swt.widgets.ControladdControlListener, addDragDetectListener, addFocusListener, addGestureListener, addHelpListener, addKeyListener, addMenuDetectListener, addMouseListener, addTouchListener, addTraverseListener, computeSize, forceFocus, getAccessible, 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, updateMethods inherited from class org.eclipse.swt.widgets.WidgetaddDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, reskin, setData, toString
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Constructor Details- 
ScaleConstructs 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 SWTwhich 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 thoseSWTstyle 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:
 
 
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Method Details- 
addSelectionListenerAdds the listener to the collection of listeners who will be notified when the user changes the receiver's value, by sending it one of the messages defined in theSelectionListenerinterface.widgetSelectedis called when the user changes the receiver's value.widgetDefaultSelectedis 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:
 
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removeSelectionListenerRemoves the listener from the collection of listeners who will be notified when the user changes the receiver's value.- Parameters:
- listener- the listener which should no longer 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:
 
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computeSizeDescription copied from class:ControlReturns 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.DEFAULTis 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 befalse, so layout manager caches can be retained.- Overrides:
- computeSizein class- Control
- Parameters:
- wHint- the width hint (can be- SWT.DEFAULT)
- hHint- the height hint (can be- SWT.DEFAULT)
- changed-- trueif the control's contents have changed, and- falseotherwise
- Returns:
- the preferred size of the control.
- See Also:
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- Layout
- Control.getBorderWidth()
- Control.getBounds()
- Control.getSize()
- Control.pack(boolean)
- "computeTrim, getClientArea for controls that implement them"
 
 
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getIncrementpublic int getIncrement()Returns the amount that the receiver's value will be modified by when the up/down (or right/left) arrows are pressed.- Returns:
- the increment
- 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
 
 
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getMaximumpublic int getMaximum()Returns the maximum value which the receiver will allow.- Returns:
- the maximum
- 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
 
 
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getMinimumpublic int getMinimum()Returns the minimum value which the receiver will allow.- Returns:
- the minimum
- 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
 
 
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getPageIncrementpublic int getPageIncrement()Returns the amount that the receiver's value will be modified by when the page increment/decrement areas are selected.- Returns:
- the page increment
- 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
 
 
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getSelectionpublic int getSelection()Returns the 'selection', which is the receiver's position.- Returns:
- the selection
- 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
 
 
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setIncrementpublic void setIncrement(int increment) Sets the amount that the receiver's value will be modified by when the up/down (or right/left) arrows are pressed to the argument, which must be at least one.- Parameters:
- increment- the new increment (must be greater than zero)
- 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
 
 
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setMaximumpublic void setMaximum(int maximum) Sets the maximum value that the receiver will allow. This new value will be ignored if it is not greater than the receiver's current minimum value. If the new maximum is applied then the receiver's selection value will be adjusted if necessary to fall within its new range.- Parameters:
- maximum- the new maximum, which must be greater than the current minimum
- 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
 
 
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setMinimumpublic void setMinimum(int minimum) Sets the minimum value that the receiver will allow. This new value will be ignored if it is negative or is not less than the receiver's current maximum value. If the new minimum is applied then the receiver's selection value will be adjusted if necessary to fall within its new range.- Parameters:
- minimum- the new minimum, which must be nonnegative and less than the current maximum
- 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
 
 
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setPageIncrementpublic void setPageIncrement(int pageIncrement) Sets the amount that the receiver's value will be modified by when the page increment/decrement areas are selected to the argument, which must be at least one.- Parameters:
- pageIncrement- the page increment (must be greater than zero)
- 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
 
 
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setSelectionpublic void setSelection(int selection) Sets the 'selection', which is the receiver's value, to the argument which must be greater than or equal to zero.- Parameters:
- selection- the new selection (must be zero or greater)
- 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
 
 
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getAdapterDescription copied from class:WidgetImplementation of theAdaptableinterface.IMPORTANT: This method is not part of the RWT public API. It is marked public only so that it can be shared within the packages provided by RWT. It should never be accessed from application code. - Specified by:
- getAdapterin interface- Adaptable
- Overrides:
- getAdapterin class- Control
- Parameters:
- adapter- the lookup class
- Returns:
- an object that can be cast to the given class or nullif there is no adapter associated with the given class.
 
 
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