javax.swing.plaf.basic
Class BasicScrollPaneUI

java.lang.Object
  |
  +--javax.swing.plaf.ComponentUI
        |
        +--javax.swing.plaf.ScrollPaneUI
              |
              +--javax.swing.plaf.basic.BasicScrollPaneUI

Direct Known Subclasses:

MetalScrollPaneUI

public class BasicScrollPaneUI

extends ScrollPaneUI

implements ScrollPaneConstants

A default L&F implementation of ScrollPaneUI.

Inner Class Summary

class	BasicScrollPaneUI.HSBChangeListener Horizontal scrollbar listener.
class	BasicScrollPaneUI.PropertyChangeHandler
class	BasicScrollPaneUI.ViewportChangeHandler Listener for viewport events.
class	BasicScrollPaneUI.VSBChangeListener Vertical scrollbar listener.

Field Summary

protected ChangeListener	hsbChangeListener
protected JScrollPane	scrollpane
protected PropertyChangeListener	spPropertyChangeListener
protected ChangeListener	viewportChangeListener
protected ChangeListener	vsbChangeListener

Fields inherited from interface javax.swing.ScrollPaneConstants

COLUMN_HEADER, HORIZONTAL_SCROLLBAR, HORIZONTAL_SCROLLBAR_ALWAYS, HORIZONTAL_SCROLLBAR_AS_NEEDED, HORIZONTAL_SCROLLBAR_NEVER, HORIZONTAL_SCROLLBAR_POLICY, LOWER_LEFT_CORNER, LOWER_RIGHT_CORNER, ROW_HEADER, UPPER_LEFT_CORNER, UPPER_RIGHT_CORNER, VERTICAL_SCROLLBAR, VERTICAL_SCROLLBAR_ALWAYS, VERTICAL_SCROLLBAR_AS_NEEDED, VERTICAL_SCROLLBAR_NEVER, VERTICAL_SCROLLBAR_POLICY, VIEWPORT

Constructor Summary

BasicScrollPaneUI()

Method Summary

protected ChangeListener	createHSBChangeListener()
protected PropertyChangeListener	createPropertyChangeListener() Creates an instance of PropertyChangeListener that's added to the JScrollPane by installUI().
static ComponentUI	createUI(JComponent x)
protected ChangeListener	createViewportChangeListener()
protected ChangeListener	createVSBChangeListener()
Dimension	getMaximumSize(JComponent c)
Dimension	getMinimumSize(JComponent c)
Dimension	getPreferredSize(JComponent c)
protected void	installDefaults(JScrollPane scrollpane)
protected void	installKeyboardActions(JScrollPane c)
protected void	installListeners(JScrollPane c)
void	installUI(JComponent x)
void	paint(Graphics g, JComponent c)
protected void	syncScrollPaneWithViewport()
protected void	uninstallDefaults(JScrollPane c)
protected void	uninstallKeyboardActions(JScrollPane c)
protected void	uninstallListeners(JComponent c)
void	uninstallUI(JComponent c)
protected void	updateColumnHeader(PropertyChangeEvent e)
protected void	updateRowHeader(PropertyChangeEvent e)
protected void	updateScrollBarDisplayPolicy(PropertyChangeEvent e)
protected void	updateViewport(PropertyChangeEvent e)

Methods inherited from class javax.swing.plaf.ComponentUI

contains, getAccessibleChild, getAccessibleChildrenCount, update

Methods inherited from class java.lang.Object

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

Field Detail

scrollpane

protected JScrollPane scrollpane

vsbChangeListener

protected ChangeListener vsbChangeListener

hsbChangeListener

protected ChangeListener hsbChangeListener

viewportChangeListener

protected ChangeListener viewportChangeListener

spPropertyChangeListener

protected PropertyChangeListener spPropertyChangeListener

Constructor Detail

BasicScrollPaneUI

public BasicScrollPaneUI()

Method Detail

createUI

public static ComponentUI createUI(JComponent x)

paint

public void paint(Graphics g,
                  JComponent c)

Overrides:

paint in class ComponentUI

getPreferredSize

public Dimension getPreferredSize(JComponent c)

Overrides:

getPreferredSize in class ComponentUI

Returns:

null which indicates that the LayoutManager will compute the value

See Also:

JComponent.getPreferredSize()

getMinimumSize

public Dimension getMinimumSize(JComponent c)

Overrides:

getMinimumSize in class ComponentUI

Returns:

the preferred size

See Also:

getPreferredSize(javax.swing.JComponent)

getMaximumSize

public Dimension getMaximumSize(JComponent c)

Overrides:

getMaximumSize in class ComponentUI

Returns:

new Dimension(Short.MAX_VALUE, Short.MAX_VALUE)

installDefaults

protected void installDefaults(JScrollPane scrollpane)

installListeners

protected void installListeners(JScrollPane c)

installKeyboardActions

protected void installKeyboardActions(JScrollPane c)

installUI

public void installUI(JComponent x)

Overrides:

installUI in class ComponentUI

uninstallDefaults

protected void uninstallDefaults(JScrollPane c)

uninstallListeners

protected void uninstallListeners(JComponent c)

uninstallKeyboardActions

protected void uninstallKeyboardActions(JScrollPane c)

uninstallUI

public void uninstallUI(JComponent c)

Overrides:

uninstallUI in class ComponentUI

syncScrollPaneWithViewport

protected void syncScrollPaneWithViewport()

createViewportChangeListener

protected ChangeListener createViewportChangeListener()

createHSBChangeListener

protected ChangeListener createHSBChangeListener()

createVSBChangeListener

protected ChangeListener createVSBChangeListener()

updateScrollBarDisplayPolicy

protected void updateScrollBarDisplayPolicy(PropertyChangeEvent e)

updateViewport

protected void updateViewport(PropertyChangeEvent e)

updateRowHeader

protected void updateRowHeader(PropertyChangeEvent e)

updateColumnHeader

protected void updateColumnHeader(PropertyChangeEvent e)

createPropertyChangeListener

protected PropertyChangeListener createPropertyChangeListener()

Creates an instance of PropertyChangeListener that's added to the JScrollPane by installUI(). Subclasses can override this method to return a custom PropertyChangeListener, e.g.

 class MyScrollPaneUI extends BasicScrollPaneUI {
    protected PropertyChangeListener createPropertyListener() {
        return new MyPropertyListener();
    }
    public class MyPropertyListener extends PropertyListener {
        public void propertyChange(PropertyChangeEvent e) {
            if (e.getPropertyName().equals("viewport")) {
                // do some extra work when the viewport changes
            }
            super.propertyChange(e);
        }
    }
 }
 

See Also:

PropertyListener, installUI(javax.swing.JComponent)