- java.lang.Object
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- javax.swing.plaf.ComponentUI
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- javax.swing.plaf.ScrollPaneUI
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- javax.swing.plaf.basic.BasicScrollPaneUI
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- All Implemented Interfaces:
ScrollPaneConstants
- Direct Known Subclasses:
MetalScrollPaneUI,SynthScrollPaneUI
public class BasicScrollPaneUI extends ScrollPaneUI implements ScrollPaneConstants
A default L&F implementation of ScrollPaneUI.
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Nested Class Summary
Nested Classes Modifier and Type Class Description classBasicScrollPaneUI.HSBChangeListenerHorizontal scrollbar listener.protected classBasicScrollPaneUI.MouseWheelHandlerMouseWheelHandler is an inner class which implements the MouseWheelListener interface.classBasicScrollPaneUI.PropertyChangeHandlerProperty change handler.classBasicScrollPaneUI.ViewportChangeHandlerListener for viewport events.classBasicScrollPaneUI.VSBChangeListenerVertical scrollbar listener.
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Field Summary
Fields Modifier and Type Field Description protected ChangeListenerhsbChangeListenerChangeListenerinstalled on the horizontal scrollbar.protected JScrollPanescrollpaneThe instance ofJScrollPane.protected PropertyChangeListenerspPropertyChangeListenerPropertyChangeListenerinstalled on the scroll pane.protected ChangeListenerviewportChangeListenerChangeListenerinstalled on the viewport.protected ChangeListenervsbChangeListenerChangeListenerinstalled on the vertical scrollbar.-
Fields declared in interface javax.swing.ScrollPaneConstants
COLUMN_HEADER, HORIZONTAL_SCROLLBAR, HORIZONTAL_SCROLLBAR_ALWAYS, HORIZONTAL_SCROLLBAR_AS_NEEDED, HORIZONTAL_SCROLLBAR_NEVER, HORIZONTAL_SCROLLBAR_POLICY, LOWER_LEADING_CORNER, LOWER_LEFT_CORNER, LOWER_RIGHT_CORNER, LOWER_TRAILING_CORNER, ROW_HEADER, UPPER_LEADING_CORNER, UPPER_LEFT_CORNER, UPPER_RIGHT_CORNER, UPPER_TRAILING_CORNER, VERTICAL_SCROLLBAR, VERTICAL_SCROLLBAR_ALWAYS, VERTICAL_SCROLLBAR_AS_NEEDED, VERTICAL_SCROLLBAR_NEVER, VERTICAL_SCROLLBAR_POLICY, VIEWPORT
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Constructor Summary
Constructors Constructor Description BasicScrollPaneUI()
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description protected ChangeListenercreateHSBChangeListener()Returns an instance of horizontal scroll barChangeListener.protected MouseWheelListenercreateMouseWheelListener()Creates an instance of MouseWheelListener, which is added to the JScrollPane by installUI().protected PropertyChangeListenercreatePropertyChangeListener()Creates an instance ofPropertyChangeListenerthat's added to theJScrollPanebyinstallUI().static ComponentUIcreateUI(JComponent x)Returns a new instance ofBasicScrollPaneUI.protected ChangeListenercreateViewportChangeListener()Returns an instance of viewportChangeListener.protected ChangeListenercreateVSBChangeListener()Returns an instance of vertical scroll barChangeListener.intgetBaseline(JComponent c, int width, int height)Returns the baseline.Component.BaselineResizeBehaviorgetBaselineResizeBehavior(JComponent c)Returns an enum indicating how the baseline of the component changes as the size changes.DimensiongetMaximumSize(JComponent c)Returns the specified component's maximum size appropriate for the look and feel.protected voidinstallDefaults(JScrollPane scrollpane)Installs default properties.protected voidinstallKeyboardActions(JScrollPane c)Registers keyboard actions.protected voidinstallListeners(JScrollPane c)Registers listeners.protected voidsyncScrollPaneWithViewport()Synchronizes theJScrollPanewithViewport.protected voiduninstallDefaults(JScrollPane c)Uninstalls default properties.protected voiduninstallKeyboardActions(JScrollPane c)Unregisters keyboard actions.protected voiduninstallListeners(JComponent c)Unregisters listeners.protected voidupdateColumnHeader(PropertyChangeEvent e)Updates column header.protected voidupdateRowHeader(PropertyChangeEvent e)Updates row header.protected voidupdateScrollBarDisplayPolicy(PropertyChangeEvent e)Updates a scroll bar display policy.protected voidupdateViewport(PropertyChangeEvent e)Updates viewport.-
Methods declared in class javax.swing.plaf.ComponentUI
contains, getAccessibleChild, getAccessibleChildrenCount, getMinimumSize, getPreferredSize, installUI, paint, uninstallUI, update
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Field Detail
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scrollpane
protected JScrollPane scrollpane
The instance ofJScrollPane.
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vsbChangeListener
protected ChangeListener vsbChangeListener
ChangeListenerinstalled on the vertical scrollbar.
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hsbChangeListener
protected ChangeListener hsbChangeListener
ChangeListenerinstalled on the horizontal scrollbar.
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viewportChangeListener
protected ChangeListener viewportChangeListener
ChangeListenerinstalled on the viewport.
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spPropertyChangeListener
protected PropertyChangeListener spPropertyChangeListener
PropertyChangeListenerinstalled on the scroll pane.
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Method Detail
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createUI
public static ComponentUI createUI(JComponent x)
Returns a new instance ofBasicScrollPaneUI.- Parameters:
x- a component.- Returns:
- a new instance of
BasicScrollPaneUI
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getMaximumSize
public Dimension getMaximumSize(JComponent c)
Description copied from class:ComponentUIReturns the specified component's maximum size appropriate for the look and feel. Ifnullis 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 invokesgetPreferredSizeand returns that value.- Overrides:
getMaximumSizein classComponentUI- Parameters:
c- the component whose maximum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components- Returns:
- new Dimension(Short.MAX_VALUE, Short.MAX_VALUE)
- See Also:
JComponent.getMaximumSize(),LayoutManager2.maximumLayoutSize(java.awt.Container)
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installDefaults
protected void installDefaults(JScrollPane scrollpane)
Installs default properties.- Parameters:
scrollpane- an instance ofJScrollPane
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installListeners
protected void installListeners(JScrollPane c)
Registers listeners.- Parameters:
c- an instance ofJScrollPane
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installKeyboardActions
protected void installKeyboardActions(JScrollPane c)
Registers keyboard actions.- Parameters:
c- an instance ofJScrollPane
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uninstallDefaults
protected void uninstallDefaults(JScrollPane c)
Uninstalls default properties.- Parameters:
c- an instance ofJScrollPane
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uninstallListeners
protected void uninstallListeners(JComponent c)
Unregisters listeners.- Parameters:
c- a component
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uninstallKeyboardActions
protected void uninstallKeyboardActions(JScrollPane c)
Unregisters keyboard actions.- Parameters:
c- an instance ofJScrollPane
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syncScrollPaneWithViewport
protected void syncScrollPaneWithViewport()
Synchronizes theJScrollPanewithViewport.
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getBaseline
public int getBaseline(JComponent c, int width, int height)
Returns the baseline.- Overrides:
getBaselinein classComponentUI- Parameters:
c-JComponentbaseline is being requested forwidth- the width to get the baseline forheight- the height to get the baseline for- Returns:
- baseline or a value < 0 indicating there is no reasonable baseline
- Throws:
NullPointerException- ifcisnullIllegalArgumentException- if width or height is < 0- Since:
- 1.6
- See Also:
JComponent.getBaseline(int, int)
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getBaselineResizeBehavior
public Component.BaselineResizeBehavior getBaselineResizeBehavior(JComponent c)
Returns an enum indicating how the baseline of the component changes as the size changes.- Overrides:
getBaselineResizeBehaviorin classComponentUI- Parameters:
c-JComponentto return baseline resize behavior for- Returns:
- an enum indicating how the baseline changes as the component size changes
- Throws:
NullPointerException- ifcisnull- Since:
- 1.6
- See Also:
JComponent.getBaseline(int, int)
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createViewportChangeListener
protected ChangeListener createViewportChangeListener()
Returns an instance of viewportChangeListener.- Returns:
- an instance of viewport
ChangeListener
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createHSBChangeListener
protected ChangeListener createHSBChangeListener()
Returns an instance of horizontal scroll barChangeListener.- Returns:
- an instance of horizontal scroll bar
ChangeListener
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createVSBChangeListener
protected ChangeListener createVSBChangeListener()
Returns an instance of vertical scroll barChangeListener.- Returns:
- an instance of vertical scroll bar
ChangeListener
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createMouseWheelListener
protected MouseWheelListener createMouseWheelListener()
Creates an instance of MouseWheelListener, which is added to the JScrollPane by installUI(). The returned MouseWheelListener is used to handle mouse wheel-driven scrolling.- Returns:
- MouseWheelListener which implements wheel-driven scrolling
- Since:
- 1.4
- See Also:
ComponentUI.installUI(javax.swing.JComponent),BasicScrollPaneUI.MouseWheelHandler
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updateScrollBarDisplayPolicy
protected void updateScrollBarDisplayPolicy(PropertyChangeEvent e)
Updates a scroll bar display policy.- Parameters:
e- the property change event
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updateViewport
protected void updateViewport(PropertyChangeEvent e)
Updates viewport.- Parameters:
e- the property change event
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updateRowHeader
protected void updateRowHeader(PropertyChangeEvent e)
Updates row header.- Parameters:
e- the property change event
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updateColumnHeader
protected void updateColumnHeader(PropertyChangeEvent e)
Updates column header.- Parameters:
e- the property change event
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createPropertyChangeListener
protected PropertyChangeListener createPropertyChangeListener()
Creates an instance ofPropertyChangeListenerthat's added to theJScrollPanebyinstallUI(). Subclasses can override this method to return a customPropertyChangeListener, e.g.class MyScrollPaneUI extends BasicScrollPaneUI { protected PropertyChangeListener createPropertyChangeListener() { return new MyPropertyChangeListener(); } public class MyPropertyChangeListener extends PropertyChangeListener { public void propertyChange(PropertyChangeEvent e) { if (e.getPropertyName().equals("viewport")) { // do some extra work when the viewport changes } super.propertyChange(e); } } }- Returns:
- an instance of
PropertyChangeListener - See Also:
PropertyChangeListener,ComponentUI.installUI(javax.swing.JComponent)
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