JScrollPane.ScrollBar
Class JScrollPane.ScrollBar
- java.lang.Object
-
- java.awt.Component
-
- java.awt.Container
-
- javax.swing.JComponent
-
- javax.swing.JScrollBar
-
- javax.swing.JScrollPane.ScrollBar
- All Implemented Interfaces:
- Adjustable, ImageObserver, MenuContainer, Serializable, Accessible, UIResource
- Enclosing class:
- JScrollPane
protected class JScrollPane.ScrollBar extends JScrollBar implements UIResource
By default JScrollPane
creates scrollbars that are instances of this class. Scrollbar
overrides the getUnitIncrement
and getBlockIncrement
methods so that, if the viewport's view is a Scrollable
, the view is asked to compute these values. Unless the unit/block increment have been explicitly set.
Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans™ has been added to the java.beans
package. Please see XMLEncoder
.
- See Also:
-
Scrollable
,JScrollPane.createVerticalScrollBar()
,JScrollPane.createHorizontalScrollBar()
Nested Classes
Nested classes/interfaces inherited from class javax.swing.JScrollBar
JScrollBar.AccessibleJScrollBar
Nested classes/interfaces inherited from class javax.swing.JComponent
JComponent.AccessibleJComponent
Nested classes/interfaces inherited from class java.awt.Container
Container.AccessibleAWTContainer
Nested classes/interfaces inherited from class java.awt.Component
Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy
Fields
Fields inherited from class javax.swing.JScrollBar
blockIncrement, model, orientation, unitIncrement
Fields inherited from class javax.swing.JComponent
listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW
Fields inherited from class java.awt.Component
accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT
Fields inherited from interface java.awt.Adjustable
HORIZONTAL, NO_ORIENTATION, VERTICAL
Fields inherited from interface java.awt.image.ImageObserver
ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH
Constructors
ScrollBar
public ScrollBar(int orientation)
Creates a scrollbar with the specified orientation. The options are:
-
ScrollPaneConstants.VERTICAL
-
ScrollPaneConstants.HORIZONTAL
- Parameters:
-
orientation
- an integer specifying one of the legal orientation values shown above - Since:
- 1.4
Methods
setUnitIncrement
public void setUnitIncrement(int unitIncrement)
Messages super to set the value, and resets the unitIncrementSet
instance variable to true.
- Specified by:
-
setUnitIncrement
in interfaceAdjustable
- Overrides:
-
setUnitIncrement
in classJScrollBar
- Parameters:
-
unitIncrement
- the new unit increment value, in pixels - See Also:
JScrollBar.getUnitIncrement(int)
getUnitIncrement
public int getUnitIncrement(int direction)
Computes the unit increment for scrolling if the viewport's view is a Scrollable
object. Otherwise return super.getUnitIncrement
.
- Overrides:
-
getUnitIncrement
in classJScrollBar
- Parameters:
-
direction
- less than zero to scroll up/left, greater than zero for down/right - Returns:
- an integer, in pixels, containing the unit increment
- See Also:
Scrollable.getScrollableUnitIncrement(java.awt.Rectangle, int, int)
setBlockIncrement
public void setBlockIncrement(int blockIncrement)
Messages super to set the value, and resets the blockIncrementSet
instance variable to true.
- Specified by:
-
setBlockIncrement
in interfaceAdjustable
- Overrides:
-
setBlockIncrement
in classJScrollBar
- Parameters:
-
blockIncrement
- the new block increment value, in pixels - See Also:
JScrollBar.getBlockIncrement()
getBlockIncrement
public int getBlockIncrement(int direction)
Computes the block increment for scrolling if the viewport's view is a Scrollable
object. Otherwise the blockIncrement
equals the viewport's width or height. If there's no viewport return super.getBlockIncrement
.
- Overrides:
-
getBlockIncrement
in classJScrollBar
- Parameters:
-
direction
- less than zero to scroll up/left, greater than zero for down/right - Returns:
- an integer, in pixels, containing the block increment
- See Also:
Scrollable.getScrollableBlockIncrement(java.awt.Rectangle, int, int)
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