Class SynthScrollBarUI

javax.swing.plaf.synth.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 Class Summary

Nested classes/interfaces declared in class javax.swing.plaf.basic.BasicScrollBarUI

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

Field Summary

Fields declared in 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 declared in 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

Fields declared in interface javax.swing.plaf.synth.SynthConstants

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

Constructor Summary

Constructor	Description
`SynthScrollBarUI()`	Constructs a `SynthScrollBarUI`.

Method Summary

Modifier and Type	Method	Description
`static ComponentUI`	`createUI(JComponent c)`	Returns a UI.
`SynthContext`	`getContext(JComponent c)`	Returns the Context for the specified component.
`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.
`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.
`void`	`update(Graphics g, JComponent c)`	Notifies this UI delegate to repaint the specified component.

Methods declared in class javax.swing.plaf.basic.BasicScrollBarUI

addLayoutComponent, configureScrollBarColors, createArrowButtonListener, createDecreaseButton, createIncreaseButton, createModelListener, createPropertyChangeListener, createScrollListener, createTrackListener, getMaximumSize, getMaximumThumbSize, getMinimumThumbSize, getSupportsAbsolutePositioning, getThumbBounds, getTrackBounds, installComponents, installDefaults, installKeyboardActions, installListeners, installUI, isThumbRollover, layoutContainer, layoutHScrollbar, layoutVScrollbar, minimumLayoutSize, paintDecreaseHighlight, paintIncreaseHighlight, paintThumb, paintTrack, preferredLayoutSize, removeLayoutComponent, scrollByBlock, scrollByUnit, setThumbBounds, setThumbRollover, uninstallComponents, uninstallDefaults, uninstallKeyboardActions, uninstallListeners, uninstallUI

Methods declared in class javax.swing.plaf.ComponentUI

contains, getAccessibleChild, getAccessibleChildrenCount, getBaseline, getBaselineResizeBehavior, getMinimumSize

Methods declared in class java.lang.Object

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

Constructor Details

SynthScrollBarUI

public SynthScrollBarUI()

Constructs a SynthScrollBarUI.

Method Details

createUI

public static ComponentUI createUI(JComponent c)

Returns a UI.

Parameters:: c - a component
Returns:: a UI

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.

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 ComponentUI

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:

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, 2021, 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/en/java/javase/17/docs/api/java.desktop/javax/swing/plaf/synth/SynthScrollBarUI.html