Class SynthScrollBarUI

All Implemented Interfaces:
LayoutManager, PropertyChangeListener, EventListener, SynthConstants, SynthUI, SwingConstants 

public class SynthScrollBarUI
extends BasicScrollBarUI
implements PropertyChangeListener, SynthUI

Provides the Synth L&F UI delegate for JScrollBar.

Since:
1.7

Nested Classes

Nested classes/interfaces inherited from class javax.swing.plaf.basic.BasicScrollBarUI

BasicScrollBarUI.ArrowButtonListener, BasicScrollBarUI.ModelListener, BasicScrollBarUI.PropertyChangeHandler, BasicScrollBarUI.ScrollListener, BasicScrollBarUI.TrackListener

Fields

Fields inherited from class javax.swing.plaf.basic.BasicScrollBarUI

buttonListener, decrButton, DECREASE_HIGHLIGHT, decrGap, incrButton, INCREASE_HIGHLIGHT, incrGap, isDragging, maximumThumbSize, minimumThumbSize, modelListener, NO_HIGHLIGHT, propertyChangeListener, scrollbar, scrollBarWidth, scrollListener, scrollTimer, thumbColor, thumbDarkShadowColor, thumbHighlightColor, thumbLightShadowColor, thumbRect, trackColor, trackHighlight, trackHighlightColor, trackListener, trackRect

Fields inherited from interface javax.swing.plaf.synth.SynthConstants

DEFAULT, DISABLED, ENABLED, FOCUSED, MOUSE_OVER, PRESSED, SELECTED

Fields inherited from interface javax.swing.SwingConstants

BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST

Constructors

Constructor and Description
SynthScrollBarUI()

Methods

Modifier and Type Method and Description
protected void configureScrollBarColors()
protected JButton createDecreaseButton(int orientation)
protected JButton createIncreaseButton(int orientation)
static ComponentUI createUI(JComponent c)
SynthContext getContext(JComponent c)

Returns the Context for the specified component.
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 void installDefaults()
protected void installListeners()
void paint(Graphics g, JComponent c)

Paints the specified component according to the Look and Feel.
protected void paint(SynthContext context, Graphics g)

Paints the specified component.
void paintBorder(SynthContext context, Graphics g, int x, int y, int w, int h)

Paints the border.
protected void paintThumb(SynthContext context, Graphics g, Rectangle thumbBounds)

Paints the scrollbar thumb.
protected void paintTrack(SynthContext context, Graphics g, Rectangle trackBounds)

Paints the scrollbar track.
void propertyChange(PropertyChangeEvent e)

This method gets called when a bound property is changed.
protected void setThumbRollover(boolean active)

Sets whether or not the mouse is currently over the thumb.
protected void uninstallDefaults()
protected void uninstallListeners()
void update(Graphics g, JComponent c)

Notifies this UI delegate to repaint the specified component.

Methods inherited from class javax.swing.plaf.basic.BasicScrollBarUI

addLayoutComponent, createArrowButtonListener, createModelListener, createPropertyChangeListener, createScrollListener, createTrackListener, getMaximumSize, getMaximumThumbSize, getThumbBounds, getTrackBounds, installComponents, installKeyboardActions, installUI, isThumbRollover, layoutContainer, layoutHScrollbar, layoutVScrollbar, minimumLayoutSize, paintDecreaseHighlight, paintIncreaseHighlight, paintThumb, paintTrack, preferredLayoutSize, removeLayoutComponent, scrollByBlock, scrollByUnit, setThumbBounds, uninstallComponents, uninstallKeyboardActions, uninstallUI

Methods inherited from class javax.swing.plaf.ComponentUI

contains, getAccessibleChild, getAccessibleChildrenCount, getBaseline, getBaselineResizeBehavior, getMinimumSize

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructors

SynthScrollBarUI

public SynthScrollBarUI()

Methods

createUI

public static ComponentUI createUI(JComponent c)

installDefaults

protected void installDefaults()
Overrides:
installDefaults in class BasicScrollBarUI

configureScrollBarColors

protected void configureScrollBarColors()
Overrides:
configureScrollBarColors in class BasicScrollBarUI

installListeners

protected void installListeners()
Overrides:
installListeners in class BasicScrollBarUI

uninstallListeners

protected void uninstallListeners()
Overrides:
uninstallListeners in class BasicScrollBarUI

uninstallDefaults

protected void uninstallDefaults()
Overrides:
uninstallDefaults in class BasicScrollBarUI

getContext

public SynthContext getContext(JComponent c)

Returns the Context for the specified component.

Specified by:
getContext in interface SynthUI
Parameters:
c - Component requesting SynthContext.
Returns:
SynthContext describing component.

getSupportsAbsolutePositioning

public boolean getSupportsAbsolutePositioning()

Indicates whether the user can absolutely position the thumb with a mouse gesture (usually the middle mouse button).

Overrides:
getSupportsAbsolutePositioning in class BasicScrollBarUI
Returns:
true if a mouse gesture can absolutely position the thumb

update

public void update(Graphics g,
                   JComponent c)

Notifies this UI delegate to repaint the specified component. This method paints the component background, then calls the paint(SynthContext,Graphics) method.

In general, this method does not need to be overridden by subclasses. All Look and Feel rendering code should reside in the paint method.

Overrides:
update in class ComponentUI
Parameters:
g - the Graphics object used for painting
c - the component being painted
See Also:
paint(SynthContext,Graphics)

paint

public void paint(Graphics g,
                  JComponent c)

Paints the specified component according to the Look and Feel.

This method is not used by Synth Look and Feel. Painting is handled by the paint(SynthContext,Graphics) method.

Overrides:
paint in class BasicScrollBarUI
Parameters:
g - the Graphics object used for painting
c - the component being painted
See Also:
paint(SynthContext,Graphics)

paint

protected void paint(SynthContext context,
                     Graphics g)

Paints the specified component.

Parameters:
context - context for the component being painted
g - the Graphics object used for painting
See Also:
update(Graphics,JComponent)

paintBorder

public void paintBorder(SynthContext context,
                        Graphics g,
                        int x,
                        int y,
                        int w,
                        int h)

Paints the border.

Specified by:
paintBorder in interface SynthUI
Parameters:
context - a component context
g - Graphics to paint on
x - the X coordinate
y - the Y coordinate
w - width of the border
h - height of the border

paintTrack

protected void paintTrack(SynthContext context,
                          Graphics g,
                          Rectangle trackBounds)

Paints the scrollbar track.

Parameters:
context - context for the component being painted
g - Graphics object used for painting
trackBounds - bounding box for the track

paintThumb

protected void paintThumb(SynthContext context,
                          Graphics g,
                          Rectangle thumbBounds)

Paints the scrollbar thumb.

Parameters:
context - context for the component being painted
g - Graphics object used for painting
thumbBounds - bounding box for the thumb

getPreferredSize

public 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. 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 in class BasicScrollBarUI
Parameters:
c - the JScrollBar that's delegating this method to us
Returns:
the preferred size of a Basic JScrollBar
See Also:
BasicScrollBarUI.getMaximumSize(javax.swing.JComponent), ComponentUI.getMinimumSize(javax.swing.JComponent)

getMinimumThumbSize

protected Dimension 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.

Overrides:
getMinimumThumbSize in class BasicScrollBarUI
Returns:
The smallest acceptable size for the thumb.
See Also:
BasicScrollBarUI.getMaximumThumbSize()

createDecreaseButton

protected JButton createDecreaseButton(int orientation)
Overrides:
createDecreaseButton in class BasicScrollBarUI

createIncreaseButton

protected JButton createIncreaseButton(int orientation)
Overrides:
createIncreaseButton in class BasicScrollBarUI

setThumbRollover

protected void setThumbRollover(boolean active)

Sets whether or not the mouse is currently over the thumb.

Overrides:
setThumbRollover in class BasicScrollBarUI
Parameters:
active - True indicates the thumb is currently active.

propertyChange

public void propertyChange(PropertyChangeEvent e)

Description copied from interface: PropertyChangeListener

This method gets called when a bound property is changed.

Specified by:
propertyChange in interface PropertyChangeListener
Parameters:
e - A PropertyChangeEvent object describing the event source and the property that has changed.

© 1993, 2020, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/javase/8/docs/api/javax/swing/plaf/synth/SynthScrollBarUI.html