Package org.eclipse.swt.widgets
Class Scale
java.lang.Object
org.eclipse.swt.widgets.Widget
org.eclipse.swt.widgets.Control
org.eclipse.swt.widgets.Scale
- All Implemented Interfaces:
Drawable
Instances of the receiver represent a selectable user
interface object that present a range of continuous
numeric values.
- Styles:
- HORIZONTAL, VERTICAL
- Events:
- Selection
Note: Only one of the styles HORIZONTAL and VERTICAL may be specified.
IMPORTANT: This class is not intended to be subclassed.
- See Also:
- Restriction:
- This class is not intended to be subclassed by clients.
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Field Summary
Fields inherited from class org.eclipse.swt.widgets.Widget
nativeZoom
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionvoid
addSelectionListener
(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 theSelectionListener
interface.int
Returns the amount that the receiver's value will be modified by when the up/down (or right/left) arrows are pressed.int
Returns the maximum value which the receiver will allow.int
Returns the minimum value which the receiver will allow.int
Returns the amount that the receiver's value will be modified by when the page increment/decrement areas are selected.int
Returns the 'selection', which is the receiver's position.void
removeSelectionListener
(SelectionListener listener) Removes the listener from the collection of listeners who will be notified when the user changes the receiver's value.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.void
setMaximum
(int value) Sets the maximum value that the receiver will allow.void
setMinimum
(int value) Sets the minimum value that the receiver will allow.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.void
setSelection
(int value) 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.Control
addControlListener, addDragDetectListener, addFocusListener, addGestureListener, addHelpListener, addKeyListener, addMenuDetectListener, addMouseListener, addMouseMoveListener, addMouseTrackListener, addMouseWheelListener, addPaintListener, addTouchListener, addTraverseListener, computeSize, computeSize, dragDetect, dragDetect, forceFocus, getAccessible, getBackground, getBackgroundImage, getBorderWidth, getBounds, getCursor, getDragDetect, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getMonitor, getOrientation, getParent, getRegion, getShell, getSize, getTextDirection, getToolTipText, getTouchEnabled, getVisible, internal_dispose_GC, internal_new_GC, isEnabled, isFocusControl, isReparentable, isVisible, moveAbove, moveBelow, pack, pack, print, redraw, redraw, removeControlListener, removeDragDetectListener, removeFocusListener, removeGestureListener, removeHelpListener, removeKeyListener, removeMenuDetectListener, removeMouseListener, removeMouseMoveListener, removeMouseTrackListener, removeMouseWheelListener, removePaintListener, removeTouchListener, removeTraverseListener, requestLayout, setBackground, setBackgroundImage, setBounds, setBounds, setCapture, setCursor, setDragDetect, setEnabled, setFocus, setFont, setForeground, setLayoutData, setLocation, setLocation, setMenu, setOrientation, setParent, setRedraw, setRegion, setSize, setSize, setTextDirection, setToolTipText, setTouchEnabled, setVisible, toControl, toControl, toDisplay, toDisplay, traverse, traverse, traverse, update
Methods inherited from class org.eclipse.swt.widgets.Widget
addDisposeListener, addListener, addTypedListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, getTypedListeners, isAutoDirection, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, removeTypedListener, reskin, setData, setData, toString
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface org.eclipse.swt.graphics.Drawable
isAutoScalable
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Constructor Details
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Scale
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:
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
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addSelectionListener
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 theSelectionListener
interface.widgetSelected
is called when the user changes the receiver's value.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:
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getIncrement
public 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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getMaximum
public 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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getMinimum
public 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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getPageIncrement
public 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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getSelection
public 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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removeSelectionListener
Removes 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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setIncrement
public 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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setMaximum
public void setMaximum(int value) 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:
value
- 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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setMinimum
public void setMinimum(int value) 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:
value
- 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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setPageIncrement
public 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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setSelection
public void setSelection(int value) Sets the 'selection', which is the receiver's value, to the argument which must be greater than or equal to zero.- Parameters:
value
- 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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