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java.lang.Object org.eclipse.swt.widgets.Widget org.eclipse.swt.widgets.Control org.eclipse.swt.widgets.Scale
public class Scale
Instances of the receiver represent a selectable user interface object that present a range of continuous numeric values.
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.
Constructor Summary | |
---|---|
Scale(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 | |
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void |
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 the SelectionListener interface. |
Point |
computeSize(int wHint,
int hHint,
boolean changed)
Returns the preferred size of the receiver. |
int |
getIncrement()
Returns the amount that the receiver's value will be modified by when the up/down (or right/left) arrows are pressed. |
int |
getMaximum()
Returns the maximum value which the receiver will allow. |
int |
getMinimum()
Returns the minimum value which the receiver will allow. |
int |
getPageIncrement()
Returns the amount that the receiver's value will be modified by when the page increment/decrement areas are selected. |
int |
getSelection()
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 maximum)
Sets the maximum value that the receiver will allow. |
void |
setMinimum(int minimum)
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 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.Widget |
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addDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, reskin, setData, setData, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public Scale(Composite parent, int style)
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.
parent
- a composite control which will be the parent of the new
instance (cannot be null)style
- the style of control to construct
java.lang.IllegalArgumentException
- SWTException
- SWT.HORIZONTAL
,
SWT.VERTICAL
,
Widget.checkSubclass()
,
Widget.getStyle()
Method Detail |
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public void addSelectionListener(SelectionListener listener)
SelectionListener
interface.
widgetSelected
is called when the user changes the receiver's
value. widgetDefaultSelected
is not called.
listener
- the listener which should be notified
java.lang.IllegalArgumentException
- SWTException
- SelectionListener
,
removeSelectionListener(org.eclipse.swt.events.SelectionListener)
public void removeSelectionListener(SelectionListener listener)
listener
- the listener which should no longer be notified
java.lang.IllegalArgumentException
- SWTException
- SelectionListener
,
addSelectionListener(org.eclipse.swt.events.SelectionListener)
public Point computeSize(int wHint, int hHint, boolean changed)
Control
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.
computeSize
in class Control
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
Layout
,
Control.getBorderWidth()
,
Control.getBounds()
,
Control.getSize()
,
Control.pack(boolean)
,
"computeTrim, getClientArea for controls that implement them"public int getIncrement()
SWTException
- public int getMaximum()
SWTException
- public int getMinimum()
SWTException
- public int getPageIncrement()
SWTException
- public int getSelection()
SWTException
- public void setIncrement(int increment)
increment
- the new increment (must be greater than zero)
SWTException
- public void setMaximum(int maximum)
maximum
- the new maximum, which must be greater than the current
minimum
SWTException
- public void setMinimum(int minimum)
minimum
- the new minimum, which must be nonnegative and less than the
current maximum
SWTException
- public void setPageIncrement(int pageIncrement)
pageIncrement
- the page increment (must be greater than zero)
SWTException
- public void setSelection(int selection)
selection
- the new selection (must be zero or greater)
SWTException
-
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