BasicScrollBarUI (Java Platform SE 8 ) (original) (raw)

java.lang.Object
- javax.swing.plaf.ComponentUI
- - javax.swing.plaf.ScrollBarUI
    - - javax.swing.plaf.basic.BasicScrollBarUI
All Implemented Interfaces:
LayoutManager, SwingConstants
Direct Known Subclasses:
MetalScrollBarUI, SynthScrollBarUI

public class BasicScrollBarUI
extends ScrollBarUI
implements LayoutManager, SwingConstants
Implementation of ScrollBarUI for the Basic Look and Feel

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	BasicScrollBarUI.ArrowButtonListener	Listener for cursor keys.
protected class	BasicScrollBarUI.ModelListener	A listener to listen for model changes.
class	BasicScrollBarUI.PropertyChangeHandler
protected class	BasicScrollBarUI.ScrollListener	Listener for scrolling events initiated in theScrollPane.
protected class	BasicScrollBarUI.TrackListener	Track mouse drags.

Field Summary

Fields

Modifier and Type	Field	Description
protected BasicScrollBarUI.ArrowButtonListener	buttonListener
protected JButton	decrButton
protected static int	DECREASE_HIGHLIGHT
protected int	decrGap	Distance between the decrement button and the track.
protected JButton	incrButton
protected static int	INCREASE_HIGHLIGHT
protected int	incrGap	Distance between the increment button and the track.
protected boolean	isDragging
protected Dimension	maximumThumbSize
protected Dimension	minimumThumbSize
protected BasicScrollBarUI.ModelListener	modelListener
protected static int	NO_HIGHLIGHT
protected PropertyChangeListener	propertyChangeListener
protected JScrollBar	scrollbar
protected int	scrollBarWidth	Hint as to what width (when vertical) or height (when horizontal) should be.
protected BasicScrollBarUI.ScrollListener	scrollListener
protected Timer	scrollTimer
protected Color	thumbColor
protected Color	thumbDarkShadowColor
protected Color	thumbHighlightColor
protected Color	thumbLightShadowColor
protected Rectangle	thumbRect
protected Color	trackColor
protected int	trackHighlight
protected Color	trackHighlightColor
protected BasicScrollBarUI.TrackListener	trackListener
protected Rectangle	trackRect

   * ### Fields inherited from interface javax.swing.[SwingConstants](../../../../javax/swing/SwingConstants.html "interface in javax.swing")  
   `[BOTTOM](../../../../javax/swing/SwingConstants.html#BOTTOM), [CENTER](../../../../javax/swing/SwingConstants.html#CENTER), [EAST](../../../../javax/swing/SwingConstants.html#EAST), [HORIZONTAL](../../../../javax/swing/SwingConstants.html#HORIZONTAL), [LEADING](../../../../javax/swing/SwingConstants.html#LEADING), [LEFT](../../../../javax/swing/SwingConstants.html#LEFT), [NEXT](../../../../javax/swing/SwingConstants.html#NEXT), [NORTH](../../../../javax/swing/SwingConstants.html#NORTH), [NORTH_EAST](../../../../javax/swing/SwingConstants.html#NORTH%5FEAST), [NORTH_WEST](../../../../javax/swing/SwingConstants.html#NORTH%5FWEST), [PREVIOUS](../../../../javax/swing/SwingConstants.html#PREVIOUS), [RIGHT](../../../../javax/swing/SwingConstants.html#RIGHT), [SOUTH](../../../../javax/swing/SwingConstants.html#SOUTH), [SOUTH_EAST](../../../../javax/swing/SwingConstants.html#SOUTH%5FEAST), [SOUTH_WEST](../../../../javax/swing/SwingConstants.html#SOUTH%5FWEST), [TOP](../../../../javax/swing/SwingConstants.html#TOP), [TRAILING](../../../../javax/swing/SwingConstants.html#TRAILING), [VERTICAL](../../../../javax/swing/SwingConstants.html#VERTICAL), [WEST](../../../../javax/swing/SwingConstants.html#WEST)`

Constructor Summary

Constructors

Constructor	Description
BasicScrollBarUI()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods

Modifier and Type	Method	Description
void	addLayoutComponent(String name,Component child)	If the layout manager uses a per-component string, adds the component comp to the layout, associating it with the string specified by name.
protected void	configureScrollBarColors()
protected BasicScrollBarUI.ArrowButtonListener	createArrowButtonListener()
protected JButton	createDecreaseButton(int orientation)
protected JButton	createIncreaseButton(int orientation)
protected BasicScrollBarUI.ModelListener	createModelListener()
protected PropertyChangeListener	createPropertyChangeListener()
protected BasicScrollBarUI.ScrollListener	createScrollListener()
protected BasicScrollBarUI.TrackListener	createTrackListener()
static ComponentUI	createUI(JComponent c)
Dimension	getMaximumSize(JComponent c)	Returns the specified component's maximum size appropriate for the look and feel.
protected Dimension	getMaximumThumbSize()	Returns the largest acceptable size for the thumb.
protected Dimension	getMinimumThumbSize()	Returns the smallest acceptable size for the thumb.
Dimension	getPreferredSize(JComponent c)	A vertical scrollbar's preferred width is the maximum of preferred widths of the (non null) increment/decrement buttons, and the minimum width of the thumb.
boolean	getSupportsAbsolutePositioning()	Indicates whether the user can absolutely position the thumb with a mouse gesture (usually the middle mouse button).
protected Rectangle	getThumbBounds()	Return the current size/location of the thumb.
protected Rectangle	getTrackBounds()	Returns the current bounds of the track, i.e.
protected void	installComponents()
protected void	installDefaults()
protected void	installKeyboardActions()
protected void	installListeners()
void	installUI(JComponent c)	Configures the specified component appropriately for the look and feel.
boolean	isThumbRollover()	Returns true if the mouse is currently over the thumb.
void	layoutContainer(Container scrollbarContainer)	Lays out the specified container.
protected void	layoutHScrollbar(JScrollBar sb)
protected void	layoutVScrollbar(JScrollBar sb)
Dimension	minimumLayoutSize(Container scrollbarContainer)	Calculates the minimum size dimensions for the specified container, given the components it contains.
void	paint(Graphics g,JComponent c)	Paints the specified component appropriately for the look and feel.
protected void	paintDecreaseHighlight(Graphics g)
protected void	paintIncreaseHighlight(Graphics g)
protected void	paintThumb(Graphics g,JComponent c,Rectangle thumbBounds)
protected void	paintTrack(Graphics g,JComponent c,Rectangle trackBounds)
Dimension	preferredLayoutSize(Container scrollbarContainer)	Calculates the preferred size dimensions for the specified container, given the components it contains.
void	removeLayoutComponent(Component child)	Removes the specified component from the layout.
protected void	scrollByBlock(int direction)
protected void	scrollByUnit(int direction)
protected void	setThumbBounds(int x, int y, int width, int height)	Set the bounds of the thumb and force a repaint that includes the old thumbBounds and the new one.
protected void	setThumbRollover(boolean active)	Sets whether or not the mouse is currently over the thumb.
protected void	uninstallComponents()
protected void	uninstallDefaults()
protected void	uninstallKeyboardActions()
protected void	uninstallListeners()
void	uninstallUI(JComponent c)	Reverses configuration which was done on the specified component duringinstallUI.

   * ### Methods inherited from class javax.swing.plaf.[ComponentUI](../../../../javax/swing/plaf/ComponentUI.html "class in javax.swing.plaf")  
   `[contains](../../../../javax/swing/plaf/ComponentUI.html#contains-javax.swing.JComponent-int-int-), [getAccessibleChild](../../../../javax/swing/plaf/ComponentUI.html#getAccessibleChild-javax.swing.JComponent-int-), [getAccessibleChildrenCount](../../../../javax/swing/plaf/ComponentUI.html#getAccessibleChildrenCount-javax.swing.JComponent-), [getBaseline](../../../../javax/swing/plaf/ComponentUI.html#getBaseline-javax.swing.JComponent-int-int-), [getBaselineResizeBehavior](../../../../javax/swing/plaf/ComponentUI.html#getBaselineResizeBehavior-javax.swing.JComponent-), [getMinimumSize](../../../../javax/swing/plaf/ComponentUI.html#getMinimumSize-javax.swing.JComponent-), [update](../../../../javax/swing/plaf/ComponentUI.html#update-java.awt.Graphics-javax.swing.JComponent-)`  
   * ### Methods inherited from class java.lang.[Object](../../../../java/lang/Object.html "class in java.lang")  
   `[clone](../../../../java/lang/Object.html#clone--), [equals](../../../../java/lang/Object.html#equals-java.lang.Object-), [finalize](../../../../java/lang/Object.html#finalize--), [getClass](../../../../java/lang/Object.html#getClass--), [hashCode](../../../../java/lang/Object.html#hashCode--), [notify](../../../../java/lang/Object.html#notify--), [notifyAll](../../../../java/lang/Object.html#notifyAll--), [toString](../../../../java/lang/Object.html#toString--), [wait](../../../../java/lang/Object.html#wait--), [wait](../../../../java/lang/Object.html#wait-long-), [wait](../../../../java/lang/Object.html#wait-long-int-)`

Field Detail

 * #### minimumThumbSize  
 protected [Dimension](../../../../java/awt/Dimension.html "class in java.awt") minimumThumbSize  
 * #### maximumThumbSize  
 protected [Dimension](../../../../java/awt/Dimension.html "class in java.awt") maximumThumbSize  
 * #### thumbHighlightColor  
 protected [Color](../../../../java/awt/Color.html "class in java.awt") thumbHighlightColor  
 * #### thumbLightShadowColor  
 protected [Color](../../../../java/awt/Color.html "class in java.awt") thumbLightShadowColor  
 * #### thumbDarkShadowColor  
 protected [Color](../../../../java/awt/Color.html "class in java.awt") thumbDarkShadowColor  
 * #### thumbColor  
 protected [Color](../../../../java/awt/Color.html "class in java.awt") thumbColor  
 * #### trackColor  
 protected [Color](../../../../java/awt/Color.html "class in java.awt") trackColor  
 * #### trackHighlightColor  
 protected [Color](../../../../java/awt/Color.html "class in java.awt") trackHighlightColor  
 * #### scrollbar  
 protected [JScrollBar](../../../../javax/swing/JScrollBar.html "class in javax.swing") scrollbar  
 * #### incrButton  
 protected [JButton](../../../../javax/swing/JButton.html "class in javax.swing") incrButton  
 * #### decrButton  
 protected [JButton](../../../../javax/swing/JButton.html "class in javax.swing") decrButton  
 * #### isDragging  
 protected boolean isDragging  
 * #### trackListener  
 protected [BasicScrollBarUI.TrackListener](../../../../javax/swing/plaf/basic/BasicScrollBarUI.TrackListener.html "class in javax.swing.plaf.basic") trackListener  
 * #### buttonListener  
 protected [BasicScrollBarUI.ArrowButtonListener](../../../../javax/swing/plaf/basic/BasicScrollBarUI.ArrowButtonListener.html "class in javax.swing.plaf.basic") buttonListener  
 * #### modelListener  
 protected [BasicScrollBarUI.ModelListener](../../../../javax/swing/plaf/basic/BasicScrollBarUI.ModelListener.html "class in javax.swing.plaf.basic") modelListener  
 * #### thumbRect  
 protected [Rectangle](../../../../java/awt/Rectangle.html "class in java.awt") thumbRect  
 * #### trackRect  
 protected [Rectangle](../../../../java/awt/Rectangle.html "class in java.awt") trackRect  
 * #### trackHighlight  
 protected int trackHighlight  
 * #### NO\_HIGHLIGHT  
 protected static final int NO_HIGHLIGHT  
 See Also:  
 [Constant Field Values](../../../../constant-values.html#javax.swing.plaf.basic.BasicScrollBarUI.NO%5FHIGHLIGHT)  
 * #### DECREASE\_HIGHLIGHT  
 protected static final int DECREASE_HIGHLIGHT  
 See Also:  
 [Constant Field Values](../../../../constant-values.html#javax.swing.plaf.basic.BasicScrollBarUI.DECREASE%5FHIGHLIGHT)  
 * #### INCREASE\_HIGHLIGHT  
 protected static final int INCREASE_HIGHLIGHT  
 See Also:  
 [Constant Field Values](../../../../constant-values.html#javax.swing.plaf.basic.BasicScrollBarUI.INCREASE%5FHIGHLIGHT)  
 * #### scrollListener  
 protected [BasicScrollBarUI.ScrollListener](../../../../javax/swing/plaf/basic/BasicScrollBarUI.ScrollListener.html "class in javax.swing.plaf.basic") scrollListener  
 * #### propertyChangeListener  
 protected [PropertyChangeListener](../../../../java/beans/PropertyChangeListener.html "interface in java.beans") propertyChangeListener  
 * #### scrollTimer  
 protected [Timer](../../../../javax/swing/Timer.html "class in javax.swing") scrollTimer  
 * #### scrollBarWidth  
 protected int scrollBarWidth  
 Hint as to what width (when vertical) or height (when horizontal) should be.  
 Since:  
 1.7  
 * #### incrGap  
 protected int incrGap  
 Distance between the increment button and the track. This may be a negative number. If negative, then an overlap between the button and track will occur, which is useful for shaped buttons.  
 Since:  
 1.7  
 * #### decrGap  
 protected int decrGap  
 Distance between the decrement button and the track. This may be a negative number. If negative, then an overlap between the button and track will occur, which is useful for shaped buttons.  
 Since:  
 1.7

Constructor Detail

* #### BasicScrollBarUI  
public BasicScrollBarUI()

Method Detail

* #### createUI  
public static [ComponentUI](../../../../javax/swing/plaf/ComponentUI.html "class in javax.swing.plaf") createUI([JComponent](../../../../javax/swing/JComponent.html "class in javax.swing") c)  
* #### configureScrollBarColors  
protected void configureScrollBarColors()  
* #### installUI  
public void installUI([JComponent](../../../../javax/swing/JComponent.html "class in javax.swing") c)  
Configures the specified component appropriately for the look and feel. This method is invoked when the `ComponentUI` instance is being installed as the UI delegate on the specified component. This method should completely configure the component for the look and feel, including the following:  
         1. Install default property values for color, fonts, borders, icons, opacity, etc. on the component. Whenever possible, property values initialized by the client program should _not_ be overridden.  
         2. Install a `LayoutManager` on the component if necessary.  
         3. Create/add any required sub-components to the component.  
         4. Create/install event listeners on the component.  
         5. Create/install a `PropertyChangeListener` on the component in order to detect and respond to component property changes appropriately.  
         6. Install keyboard UI (mnemonics, traversal, etc.) on the component.  
         7. Initialize any appropriate instance data.  
Overrides:  
`[installUI](../../../../javax/swing/plaf/ComponentUI.html#installUI-javax.swing.JComponent-)` in class `[ComponentUI](../../../../javax/swing/plaf/ComponentUI.html "class in javax.swing.plaf")`  
Parameters:  
`c` \- the component where this UI delegate is being installed  
See Also:  
[ComponentUI.uninstallUI(javax.swing.JComponent)](../../../../javax/swing/plaf/ComponentUI.html#uninstallUI-javax.swing.JComponent-), [JComponent.setUI(javax.swing.plaf.ComponentUI)](../../../../javax/swing/JComponent.html#setUI-javax.swing.plaf.ComponentUI-), [JComponent.updateUI()](../../../../javax/swing/JComponent.html#updateUI--)  
* #### uninstallUI  
public void uninstallUI([JComponent](../../../../javax/swing/JComponent.html "class in javax.swing") c)  
Reverses configuration which was done on the specified component during`installUI`. This method is invoked when this`UIComponent` instance is being removed as the UI delegate for the specified component. This method should undo the configuration performed in `installUI`, being careful to leave the `JComponent` instance in a clean state (no extraneous listeners, look-and-feel-specific property objects, etc.). This should include the following:  
         1. Remove any UI-set borders from the component.  
         2. Remove any UI-set layout managers on the component.  
         3. Remove any UI-added sub-components from the component.  
         4. Remove any UI-added event/property listeners from the component.  
         5. Remove any UI-installed keyboard UI from the component.  
         6. Nullify any allocated instance data objects to allow for GC.  
Overrides:  
`[uninstallUI](../../../../javax/swing/plaf/ComponentUI.html#uninstallUI-javax.swing.JComponent-)` in class `[ComponentUI](../../../../javax/swing/plaf/ComponentUI.html "class in javax.swing.plaf")`  
Parameters:  
`c` \- the component from which this UI delegate is being removed; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components  
See Also:  
[ComponentUI.installUI(javax.swing.JComponent)](../../../../javax/swing/plaf/ComponentUI.html#installUI-javax.swing.JComponent-), [JComponent.updateUI()](../../../../javax/swing/JComponent.html#updateUI--)  
* #### installDefaults  
protected void installDefaults()  
* #### installComponents  
protected void installComponents()  
* #### uninstallComponents  
protected void uninstallComponents()  
* #### installListeners  
protected void installListeners()  
* #### installKeyboardActions  
protected void installKeyboardActions()  
* #### uninstallKeyboardActions  
protected void uninstallKeyboardActions()  
* #### uninstallListeners  
protected void uninstallListeners()  
* #### uninstallDefaults  
protected void uninstallDefaults()  
* #### createTrackListener  
protected [BasicScrollBarUI.TrackListener](../../../../javax/swing/plaf/basic/BasicScrollBarUI.TrackListener.html "class in javax.swing.plaf.basic") createTrackListener()  
* #### createArrowButtonListener  
protected [BasicScrollBarUI.ArrowButtonListener](../../../../javax/swing/plaf/basic/BasicScrollBarUI.ArrowButtonListener.html "class in javax.swing.plaf.basic") createArrowButtonListener()  
* #### createModelListener  
protected [BasicScrollBarUI.ModelListener](../../../../javax/swing/plaf/basic/BasicScrollBarUI.ModelListener.html "class in javax.swing.plaf.basic") createModelListener()  
* #### createScrollListener  
protected [BasicScrollBarUI.ScrollListener](../../../../javax/swing/plaf/basic/BasicScrollBarUI.ScrollListener.html "class in javax.swing.plaf.basic") createScrollListener()  
* #### createPropertyChangeListener  
protected [PropertyChangeListener](../../../../java/beans/PropertyChangeListener.html "interface in java.beans") createPropertyChangeListener()  
* #### setThumbRollover  
protected void setThumbRollover(boolean active)  
Sets whether or not the mouse is currently over the thumb.  
Parameters:  
`active` \- True indicates the thumb is currently active.  
Since:  
1.5  
* #### isThumbRollover  
public boolean isThumbRollover()  
Returns true if the mouse is currently over the thumb.  
Returns:  
true if the thumb is currently active  
Since:  
1.5  
* #### paint  
public void paint([Graphics](../../../../java/awt/Graphics.html "class in java.awt") g,  
                  [JComponent](../../../../javax/swing/JComponent.html "class in javax.swing") c)  
Paints the specified component appropriately for the look and feel. This method is invoked from the `ComponentUI.update` method when the specified component is being painted. Subclasses should override this method and use the specified `Graphics` object to render the content of the component.  
Overrides:  
`[paint](../../../../javax/swing/plaf/ComponentUI.html#paint-java.awt.Graphics-javax.swing.JComponent-)` in class `[ComponentUI](../../../../javax/swing/plaf/ComponentUI.html "class in javax.swing.plaf")`  
Parameters:  
`g` \- the `Graphics` context in which to paint  
`c` \- the component being painted; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components  
See Also:  
[ComponentUI.update(java.awt.Graphics, javax.swing.JComponent)](../../../../javax/swing/plaf/ComponentUI.html#update-java.awt.Graphics-javax.swing.JComponent-)  
* #### getPreferredSize  
public [Dimension](../../../../java/awt/Dimension.html "class in java.awt") getPreferredSize([JComponent](../../../../javax/swing/JComponent.html "class in javax.swing") c)  
A vertical scrollbar's preferred width is the maximum of preferred widths of the (non `null`) increment/decrement buttons, and the minimum width of the thumb. The preferred height is the sum of the preferred heights of the same parts. The basis for the preferred size of a horizontal scrollbar is similar.  
 The `preferredSize` is only computed once, subsequent calls to this method just return a cached size.  
Overrides:  
`[getPreferredSize](../../../../javax/swing/plaf/ComponentUI.html#getPreferredSize-javax.swing.JComponent-)` in class `[ComponentUI](../../../../javax/swing/plaf/ComponentUI.html "class in javax.swing.plaf")`  
Parameters:  
`c` \- the `JScrollBar` that's delegating this method to us  
Returns:  
the preferred size of a Basic JScrollBar  
See Also:  
[getMaximumSize(javax.swing.JComponent)](../../../../javax/swing/plaf/basic/BasicScrollBarUI.html#getMaximumSize-javax.swing.JComponent-), [ComponentUI.getMinimumSize(javax.swing.JComponent)](../../../../javax/swing/plaf/ComponentUI.html#getMinimumSize-javax.swing.JComponent-)  
* #### getMaximumSize  
public [Dimension](../../../../java/awt/Dimension.html "class in java.awt") getMaximumSize([JComponent](../../../../javax/swing/JComponent.html "class in javax.swing") c)  
Returns the specified component's maximum size appropriate for the look and feel. If `null` is returned, the maximum size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method invokes `getPreferredSize` and returns that value.  
Overrides:  
`[getMaximumSize](../../../../javax/swing/plaf/ComponentUI.html#getMaximumSize-javax.swing.JComponent-)` in class `[ComponentUI](../../../../javax/swing/plaf/ComponentUI.html "class in javax.swing.plaf")`  
Parameters:  
`c` \- The JScrollBar that's delegating this method to us.  
Returns:  
new Dimension(Integer.MAX\_VALUE, Integer.MAX\_VALUE);  
See Also:  
[ComponentUI.getMinimumSize(javax.swing.JComponent)](../../../../javax/swing/plaf/ComponentUI.html#getMinimumSize-javax.swing.JComponent-), [getPreferredSize(javax.swing.JComponent)](../../../../javax/swing/plaf/basic/BasicScrollBarUI.html#getPreferredSize-javax.swing.JComponent-)  
* #### createDecreaseButton  
protected [JButton](../../../../javax/swing/JButton.html "class in javax.swing") createDecreaseButton(int orientation)  
* #### createIncreaseButton  
protected [JButton](../../../../javax/swing/JButton.html "class in javax.swing") createIncreaseButton(int orientation)  
* #### paintDecreaseHighlight  
protected void paintDecreaseHighlight([Graphics](../../../../java/awt/Graphics.html "class in java.awt") g)  
* #### paintIncreaseHighlight  
protected void paintIncreaseHighlight([Graphics](../../../../java/awt/Graphics.html "class in java.awt") g)  
* #### paintTrack  
protected void paintTrack([Graphics](../../../../java/awt/Graphics.html "class in java.awt") g,  
                          [JComponent](../../../../javax/swing/JComponent.html "class in javax.swing") c,  
                          [Rectangle](../../../../java/awt/Rectangle.html "class in java.awt") trackBounds)  
* #### paintThumb  
protected void paintThumb([Graphics](../../../../java/awt/Graphics.html "class in java.awt") g,  
                          [JComponent](../../../../javax/swing/JComponent.html "class in javax.swing") c,  
                          [Rectangle](../../../../java/awt/Rectangle.html "class in java.awt") thumbBounds)  
* #### getMinimumThumbSize  
protected [Dimension](../../../../java/awt/Dimension.html "class in java.awt") getMinimumThumbSize()  
Returns the smallest acceptable size for the thumb. If the scrollbar becomes so small that this size isn't available, the thumb will be hidden.  
**Warning** : the value returned by this method should not be be modified, it's a shared static constant.  
Returns:  
The smallest acceptable size for the thumb.  
See Also:  
[getMaximumThumbSize()](../../../../javax/swing/plaf/basic/BasicScrollBarUI.html#getMaximumThumbSize--)  
* #### getMaximumThumbSize  
protected [Dimension](../../../../java/awt/Dimension.html "class in java.awt") getMaximumThumbSize()  
Returns the largest acceptable size for the thumb. To create a fixed size thumb one make this method and `getMinimumThumbSize` return the same value.  
**Warning** : the value returned by this method should not be be modified, it's a shared static constant.  
Returns:  
The largest acceptable size for the thumb.  
See Also:  
[getMinimumThumbSize()](../../../../javax/swing/plaf/basic/BasicScrollBarUI.html#getMinimumThumbSize--)  
* #### addLayoutComponent  
public void addLayoutComponent([String](../../../../java/lang/String.html "class in java.lang") name,  
                               [Component](../../../../java/awt/Component.html "class in java.awt") child)  
If the layout manager uses a per-component string, adds the component `comp` to the layout, associating it with the string specified by `name`.  
Specified by:  
`[addLayoutComponent](../../../../java/awt/LayoutManager.html#addLayoutComponent-java.lang.String-java.awt.Component-)` in interface `[LayoutManager](../../../../java/awt/LayoutManager.html "interface in java.awt")`  
Parameters:  
`name` \- the string to be associated with the component  
`child` \- the component to be added  
* #### removeLayoutComponent  
public void removeLayoutComponent([Component](../../../../java/awt/Component.html "class in java.awt") child)  
Removes the specified component from the layout.  
Specified by:  
`[removeLayoutComponent](../../../../java/awt/LayoutManager.html#removeLayoutComponent-java.awt.Component-)` in interface `[LayoutManager](../../../../java/awt/LayoutManager.html "interface in java.awt")`  
Parameters:  
`child` \- the component to be removed  
* #### preferredLayoutSize  
public [Dimension](../../../../java/awt/Dimension.html "class in java.awt") preferredLayoutSize([Container](../../../../java/awt/Container.html "class in java.awt") scrollbarContainer)  
Calculates the preferred size dimensions for the specified container, given the components it contains.  
Specified by:  
`[preferredLayoutSize](../../../../java/awt/LayoutManager.html#preferredLayoutSize-java.awt.Container-)` in interface `[LayoutManager](../../../../java/awt/LayoutManager.html "interface in java.awt")`  
Parameters:  
`scrollbarContainer` \- the container to be laid out  
See Also:  
[LayoutManager.minimumLayoutSize(java.awt.Container)](../../../../java/awt/LayoutManager.html#minimumLayoutSize-java.awt.Container-)  
* #### minimumLayoutSize  
public [Dimension](../../../../java/awt/Dimension.html "class in java.awt") minimumLayoutSize([Container](../../../../java/awt/Container.html "class in java.awt") scrollbarContainer)  
Calculates the minimum size dimensions for the specified container, given the components it contains.  
Specified by:  
`[minimumLayoutSize](../../../../java/awt/LayoutManager.html#minimumLayoutSize-java.awt.Container-)` in interface `[LayoutManager](../../../../java/awt/LayoutManager.html "interface in java.awt")`  
Parameters:  
`scrollbarContainer` \- the component to be laid out  
See Also:  
[LayoutManager.preferredLayoutSize(java.awt.Container)](../../../../java/awt/LayoutManager.html#preferredLayoutSize-java.awt.Container-)  
* #### layoutVScrollbar  
protected void layoutVScrollbar([JScrollBar](../../../../javax/swing/JScrollBar.html "class in javax.swing") sb)  
* #### layoutHScrollbar  
protected void layoutHScrollbar([JScrollBar](../../../../javax/swing/JScrollBar.html "class in javax.swing") sb)  
* #### layoutContainer  
public void layoutContainer([Container](../../../../java/awt/Container.html "class in java.awt") scrollbarContainer)  
Lays out the specified container.  
Specified by:  
`[layoutContainer](../../../../java/awt/LayoutManager.html#layoutContainer-java.awt.Container-)` in interface `[LayoutManager](../../../../java/awt/LayoutManager.html "interface in java.awt")`  
Parameters:  
`scrollbarContainer` \- the container to be laid out  
* #### setThumbBounds  
protected void setThumbBounds(int x,  
                              int y,  
                              int width,  
                              int height)  
Set the bounds of the thumb and force a repaint that includes the old thumbBounds and the new one.  
See Also:  
[getThumbBounds()](../../../../javax/swing/plaf/basic/BasicScrollBarUI.html#getThumbBounds--)  
* #### getThumbBounds  
protected [Rectangle](../../../../java/awt/Rectangle.html "class in java.awt") getThumbBounds()  
Return the current size/location of the thumb.  
**Warning** : the value returned by this method should not be be modified, it's a reference to the actual rectangle, not a copy.  
Returns:  
The current size/location of the thumb.  
See Also:  
[setThumbBounds(int, int, int, int)](../../../../javax/swing/plaf/basic/BasicScrollBarUI.html#setThumbBounds-int-int-int-int-)  
* #### getTrackBounds  
protected [Rectangle](../../../../java/awt/Rectangle.html "class in java.awt") getTrackBounds()  
Returns the current bounds of the track, i.e. the space in between the increment and decrement buttons, less the insets. The value returned by this method is updated each time the scrollbar is laid out (validated).  
**Warning** : the value returned by this method should not be be modified, it's a reference to the actual rectangle, not a copy.  
Returns:  
the current bounds of the scrollbar track  
See Also:  
[layoutContainer(java.awt.Container)](../../../../javax/swing/plaf/basic/BasicScrollBarUI.html#layoutContainer-java.awt.Container-)  
* #### scrollByBlock  
protected void scrollByBlock(int direction)  
* #### scrollByUnit  
protected void scrollByUnit(int direction)  
* #### getSupportsAbsolutePositioning  
public boolean getSupportsAbsolutePositioning()  
Indicates whether the user can absolutely position the thumb with a mouse gesture (usually the middle mouse button).  
Returns:  
true if a mouse gesture can absolutely position the thumb  
Since:  
1.5

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BasicScrollBarUI (Java Platform SE 8 ) (original) (raw)

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