Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class BasicScrollPaneUI - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
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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.

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)