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Class com.sun.java.swing.JScrollPane

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--com.sun.java.swing.JComponent
                    |
                    +--com.sun.java.swing.JScrollPane

public class JScrollPane

extends JComponent

implements ScrollPaneConstants, Accessible

A specialized container that manages a viewport, optional vertical and horizontal scrollbars, and optional row and column heading viewports.

The JViewPort provides a window, or "viewport" onto a data source -- for example, a text file. That data source is the "scrollable client" (aka data model) displayed by the JViewport view. A JScrollPane basically consists of JScrollBars, a JViewport, and the wiring between them, as shown in the diagram at right.

In addition to the scroll bars and viewport, a JScrollPane can have a column header and a row header. Each of these is a JViewport object that you specify with setRowHeaderView, and setColumnHeaderView. The column header viewport automatically scrolls left and right, tracking the left-right scrolling of the main viewport. (It never scrolls vertically, however.) The row header acts in a similar fashion.

By default, the corners are empty. You can put a component into a corner using setCorner, in case you there is some function or decoration you would like to add to the scroll pane. The size of corner components is entirely determined by the size of the headers and scroll bars that surround them.

To add a border around the main viewport, you can use setViewportBorder. (Of course, you can also add a border around the whole scroll pane using setBorder.)

For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the JScrollPane key assignments.

Warning: serialized objects of this class will not be compatible with future swing releases. The current serialization support is appropriate for short term storage or RMI between Swing1.0 applications. It will not be possible to load serialized Swing1.0 objects with future releases of Swing. The JDK1.2 release of Swing will be the compatibility baseline for the serialized form of Swing objects.

See Also:

JScrollBar, JViewport, setViewportView(java.awt.Component), setRowHeaderView(java.awt.Component), setColumnHeaderView(java.awt.Component), setCorner(java.lang.String, java.awt.Component), setViewportBorder(com.sun.java.swing.border.Border), Serialized Form

Inner Class Summary

protected	JScrollPane.AccessibleJScrollPane The class used to obtain the accessible role for this object.
protected	JScrollPane.ScrollBar By default JScrollPane creates scrollbars that are instances of this class.

Inner classes inherited from class com.sun.java.swing.JComponent

JComponent.AccessibleJComponent

Field Summary

protected JViewport	columnHeader The column header child.
protected JScrollBar	horizontalScrollBar The scrollpanes horizontal scrollbar child.
protected int	horizontalScrollBarPolicy The display policy for the horizontal scrollbar.
protected Component	lowerLeft The component to display in the lower left corner.
protected Component	lowerRight The component to display in the lower right corner.
protected JViewport	rowHeader The row header child.
protected Component	upperLeft The component to display in the upper left corner.
protected Component	upperRight The component to display in the upper right corner.
protected JScrollBar	verticalScrollBar The scrollpanes vertical scrollbar child.
protected int	verticalScrollBarPolicy The display policy for the vertical scrollbar.
protected JViewport	viewport The scrollpanes viewport child.

Fields inherited from class com.sun.java.swing.JComponent

accessibleContext , listenerList , TOOL_TIP_TEXT_KEY , ui , UNDEFINED_CONDITION , WHEN_ANCESTOR_OF_FOCUSED_COMPONENT , WHEN_FOCUSED , WHEN_IN_FOCUSED_WINDOW

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT , CENTER_ALIGNMENT , LEFT_ALIGNMENT , RIGHT_ALIGNMENT , TOP_ALIGNMENT

Constructor Summary

JScrollPane()
Create an empty (no viewport view) JScrollPane where both horizontal and vertical scrollbars appear when needed.

JScrollPane(Component view, int vsbPolicy, int hsbPolicy)
Create a JScrollPane that displays the view component in a viewport whose view position can be controlled with a pair of scrollbars.

JScrollPane(Component view)
Create a JScrollPane that displays the contents of the specified component, where both horizontal and vertical scrollbars appear whenever the component's contents are larger than the view.

JScrollPane(int vsbPolicy, int hsbPolicy)
Create an empty (no viewport view) JScrollPane with specified scrollbar policies.

Method Summary

JScrollBar	createHorizontalScrollBar() Used by ScrollPaneUI implementations to create the horizontal scrollbar.
JScrollBar	createVerticalScrollBar() Used by ScrollPaneUI implementations to create the vertical scrollbar.
protected JViewport	createViewport() Returns a new JViewport by default.
AccessibleContext	getAccessibleContext() Get the AccessibleContext associated with this JComponent
JViewport	getColumnHeader()
Component	getCorner(String key) Returns the component at the specified corner, where key is one of: JScrollPane.
JScrollBar	getHorizontalScrollBar()
int	getHorizontalScrollBarPolicy()
JViewport	getRowHeader()
ScrollPaneUI	getUI()
String	getUIClassID() Returns the key used to look up the ScrollPaneUI class that provides the look and feel for JScrollPane.
JScrollBar	getVerticalScrollBar()
int	getVerticalScrollBarPolicy()
JViewport	getViewport() Returns the current JViewport.
Border	getViewportBorder() Returns the value of the viewportBorder property.
Rectangle	getViewportBorderBounds()
boolean	isOpaque() Returns true if this component paints every pixel in its range.
boolean	isValidateRoot() Calls to revalidate() on any descendant of this JScrollPane, e.g. the viewports view, will cause a request to be queued that will validate the JScrollPane and all its descendants.
void	setColumnHeader(JViewport columnHeader) If an old columnHeader exists, remove it.
void	setColumnHeaderView(Component view) Creates a column-header viewport if neccessary, sets its view and then adds the column-header viewport to the scrollpane.
void	setCorner(String key, Component corner) Adds a child that will appear in one of the scroll panes corners, if there's room.
void	setHorizontalScrollBar(JScrollBar horizontalScrollBar) Add the scrollbar that controls the viewports horizontal view position to the scrollpane.
void	setHorizontalScrollBarPolicy(int policy)
void	setLayout(LayoutManager layout) Sets the layout manager for this JScrollPane.
void	setRowHeader(JViewport rowHeader) If an old rowHeader exists, remove it.
void	setRowHeaderView(Component view) Creates a row-header viewport if neccessary, sets its view and then adds the row-header viewport to the scrollpane.
void	setUI(ScrollPaneUI ui) Sets the ScrollPaneUI object that provides the look and feel for this component.
void	setVerticalScrollBar(JScrollBar verticalScrollBar) Add the scrollbar that controls the viewports vertical view position to the scrollpane.
void	setVerticalScrollBarPolicy(int policy)
void	setViewport(JViewport viewport) Remove the old viewport (if there is one), force the viewPosition of the new viewport to be in the +x,+y quadrant, sync up the row and column headers (if there are any) with the new viewport, and finally sync the scrollbars and headers with the new viewport.
void	setViewportBorder(Border viewportBorder) Add a border around the viewport.
void	setViewportView(Component view) Creates a viewport if neccessary and then sets its view.
void	updateUI() To be called when the default look and feel changes.

Methods inherited from class com.sun.java.swing.JComponent

addAncestorListener , addNotify , addPropertyChangeListener , addVetoableChangeListener , computeVisibleRect , contains , createToolTip , firePropertyChange , firePropertyChange , firePropertyChange , firePropertyChange , firePropertyChange , firePropertyChange , firePropertyChange , firePropertyChange , firePropertyChange , fireVetoableChange , getActionForKeyStroke , getAlignmentX , getAlignmentY , getAutoscrolls , getBorder , getBounds , getClientProperty , getComponentGraphics , getConditionForKeyStroke , getDebugGraphicsOptions , getGraphics , getHeight , getInsets , getInsets , getLocation , getMaximumSize , getMinimumSize , getNextFocusableComponent , getPreferredSize , getRegisteredKeyStrokes , getRootPane , getSize , getToolTipLocation , getToolTipText , getToolTipText , getTopLevelAncestor , getVisibleRect , getWidth , getX , getY , grabFocus , hasFocus , isDoubleBuffered , isFocusCycleRoot , isFocusTraversable , isLightweightComponent , isManagingFocus , isOptimizedDrawingEnabled , isPaintingTile , isRequestFocusEnabled , paint , paintBorder , paintChildren , paintComponent , paintImmediately , paintImmediately , processComponentKeyEvent , processFocusEvent , processKeyEvent , processMouseMotionEvent , putClientProperty , registerKeyboardAction , registerKeyboardAction , removeAncestorListener , removeNotify , removePropertyChangeListener , removeVetoableChangeListener , repaint , repaint , requestDefaultFocus , requestFocus , resetKeyboardActions , reshape , revalidate , scrollRectToVisible , setAlignmentX , setAlignmentY , setAutoscrolls , setBorder , setDebugGraphicsOptions , setDoubleBuffered , setEnabled , setMaximumSize , setMinimumSize , setNextFocusableComponent , setOpaque , setPreferredSize , setRequestFocusEnabled , setToolTipText , setUI , setVisible , unregisterKeyboardAction , update

Methods inherited from class java.awt.Container

add , add , add , add , add , addContainerListener , addImpl , countComponents , deliverEvent , doLayout , findComponentAt , findComponentAt , getComponent , getComponentAt , getComponentAt , getComponentCount , getComponents , getLayout , insets , invalidate , isAncestorOf , layout , list , list , locate , minimumSize , paintComponents , paramString , preferredSize , print , printComponents , processContainerEvent , processEvent , remove , remove , removeAll , removeContainerListener , validate , validateTree

Methods inherited from class java.awt.Component

action , add , addComponentListener , addFocusListener , addInputMethodListener , addKeyListener , addMouseListener , addMouseMotionListener , addPropertyChangeListener , bounds , checkImage , checkImage , coalesceEvents , contains , createImage , createImage , disable , disableEvents , dispatchEvent , enable , enable , enableEvents , enableInputMethods , getBackground , getBounds , getColorModel , getComponentOrientation , getCursor , getDropTarget , getFont , getFontMetrics , getForeground , getInputContext , getInputMethodRequests , getLocale , getLocation , getLocationOnScreen , getName , getParent , getPeer , getSize , getToolkit , getTreeLock , gotFocus , handleEvent , hide , imageUpdate , inside , isDisplayable , isEnabled , isLightweight , isShowing , isValid , isVisible , keyDown , keyUp , list , list , list , location , lostFocus , mouseDown , mouseDrag , mouseEnter , mouseExit , mouseMove , mouseUp , move , nextFocus , paintAll , postEvent , prepareImage , prepareImage , printAll , processComponentEvent , processInputMethodEvent , processMouseEvent , remove , removeComponentListener , removeFocusListener , removeInputMethodListener , removeKeyListener , removeMouseListener , removeMouseMotionListener , removePropertyChangeListener , repaint , repaint , repaint , resize , resize , setBackground , setBounds , setBounds , setComponentOrientation , setCursor , setDropTarget , setFont , setForeground , setLocale , setLocation , setLocation , setName , setSize , setSize , show , show , size , toString , transferFocus

Methods inherited from class java.lang.Object

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

Field Detail

verticalScrollBarPolicy

protected int verticalScrollBarPolicy

The display policy for the vertical scrollbar. The default is JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED.

See Also:

setVerticalScrollBarPolicy(int)

horizontalScrollBarPolicy

protected int horizontalScrollBarPolicy

The display policy for the horizontal scrollbar. The default is JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED.

See Also:

setHorizontalScrollBarPolicy(int)

viewport

protected JViewport viewport

The scrollpanes viewport child. Default is an empty JViewport.

See Also:

setViewport(com.sun.java.swing.JViewport)

verticalScrollBar

protected JScrollBar verticalScrollBar

The scrollpanes vertical scrollbar child. Default is a JScrollBar.

See Also:

#setVerticalScrollbar

horizontalScrollBar

protected JScrollBar horizontalScrollBar

The scrollpanes horizontal scrollbar child. Default is a JScrollBar.

See Also:

#setHorizontalScrollbar

rowHeader

protected JViewport rowHeader

The row header child. Default is null.

See Also:

setRowHeader(com.sun.java.swing.JViewport)

columnHeader

protected JViewport columnHeader

The column header child. Default is null.

See Also:

setColumnHeader(com.sun.java.swing.JViewport)

lowerLeft

protected Component lowerLeft

The component to display in the lower left corner. Default is null.

See Also:

setCorner(java.lang.String, java.awt.Component)

lowerRight

protected Component lowerRight

The component to display in the lower right corner. Default is null.

See Also:

setCorner(java.lang.String, java.awt.Component)

upperLeft

protected Component upperLeft

The component to display in the upper left corner. Default is null.

See Also:

setCorner(java.lang.String, java.awt.Component)

upperRight

protected Component upperRight

The component to display in the upper right corner. Default is null.

See Also:

setCorner(java.lang.String, java.awt.Component)

Constructor Detail

JScrollPane

public JScrollPane(Component view,
                   int vsbPolicy,
                   int hsbPolicy)

Create a JScrollPane that displays the view component in a viewport whose view position can be controlled with a pair of scrollbars. The scrollbar policies specify when the scrollbars are displayed, e.g. if vsbPolicy is VERTICAL_SCROLLBAR_AS_NEEDED then the vertical scrollbar only appears if the view doesn't fit vertically. The available policies settings are listed at setVerticalScrollBarPolicy(int) and #setHorizontalScrollbarPolicy.

Parameters:

view - the Component to display in the scrollpanes viewport

vsbPolicy - an int that specifies the vertical scrollbar policy

hsbPolicy - an int that specifies the horizontal scrollbar policy

See Also:

setViewportView(java.awt.Component), setVerticalScrollBarPolicy(int), #setHorizontalScrollbarPolicy

JScrollPane

public JScrollPane(Component view)

Create a JScrollPane that displays the contents of the specified component, where both horizontal and vertical scrollbars appear whenever the component's contents are larger than the view.

Parameters:

view - the Component to display in the scrollpanes viewport

See Also:

setViewportView(java.awt.Component)

JScrollPane

public JScrollPane(int vsbPolicy,
                   int hsbPolicy)

Create an empty (no viewport view) JScrollPane with specified scrollbar policies. The available policies settings are listed at setVerticalScrollBarPolicy(int) and #setHorizontalScrollbarPolicy.

Parameters:

vsbPolicy - an int that specifies the vertical scrollbar policy

hsbPolicy - an int that specifies the horizontal scrollbar policy

See Also:

setViewportView(java.awt.Component), setVerticalScrollBarPolicy(int), #setHorizontalScrollbarPolicy

JScrollPane

public JScrollPane()

Create an empty (no viewport view) JScrollPane where both horizontal and vertical scrollbars appear when needed.

Method Detail

getUI

public ScrollPaneUI getUI()

Returns:

the ScrollPaneUI object that renders this component

See Also:

setUI(com.sun.java.swing.plaf.ScrollPaneUI)

setUI

public void setUI(ScrollPaneUI ui)

Sets the ScrollPaneUI object that provides the look and feel for this component.

Parameters:

ui - the ScrollPaneUI L&F object

See Also:

getUI

updateUI

public void updateUI()

To be called when the default look and feel changes. Replaces the current ScrollPaneUI object with a version from the current default LookAndFeel.

Overrides:

updateUI in class JComponent

See Also:

JComponent.updateUI(), UIManager.getUI(com.sun.java.swing.JComponent)

getUIClassID

public String getUIClassID()

Returns the key used to look up the ScrollPaneUI class that provides the look and feel for JScrollPane.

Returns:

"ScrollPaneUI"

Overrides:

getUIClassID in class JComponent

See Also:

JComponent.getUIClassID(), UIDefaults.getUI(com.sun.java.swing.JComponent)

setLayout

public void setLayout(LayoutManager layout)

Sets the layout manager for this JScrollPane. This method overrides setLayout in java.awt.Container to ensure that only LayoutManagers which are subclasses of ScrollPaneLayout can be used in a JScrollPane.

Parameters:

layout - the specified layout manager

Throws:

ClassCastException - if layout is not a ScrollPaneLayout

Overrides:

setLayout in class Container

See Also:

Container.getLayout(), Container.setLayout(java.awt.LayoutManager)

isOpaque

public boolean isOpaque()

Returns true if this component paints every pixel in its range. (In other words, it does not have a transparent background or foreground.)

Returns:

The value of the opaque property

Overrides:

isOpaque in class JComponent

See Also:

JComponent.isOpaque()

isValidateRoot

public boolean isValidateRoot()

Calls to revalidate() on any descendant of this JScrollPane, e.g. the viewports view, will cause a request to be queued that will validate the JScrollPane and all its descendants.

Returns:

true

Overrides:

isValidateRoot in class JComponent

See Also:

JComponent.revalidate()

getVerticalScrollBarPolicy

public int getVerticalScrollBarPolicy()

Returns:

the vertical scrollbar policy

See Also:

setVerticalScrollBarPolicy(int)

setVerticalScrollBarPolicy

public void setVerticalScrollBarPolicy(int policy)

getHorizontalScrollBarPolicy

public int getHorizontalScrollBarPolicy()

Returns:

the horizontal scrollbar policy.

See Also:

setHorizontalScrollBarPolicy(int)

setHorizontalScrollBarPolicy

public void setHorizontalScrollBarPolicy(int policy)

getViewportBorder

public Border getViewportBorder()

Returns the value of the viewportBorder property.

Returns:

the Border object that surrounds the viewport

See Also:

setViewportBorder(com.sun.java.swing.border.Border)

setViewportBorder

public void setViewportBorder(Border viewportBorder)

Add a border around the viewport. Note that the border isn't set on the viewport directly, JViewport doesn't support the JComponent border property. Similarly setting the JScrollPanes viewport doesn't effect the viewportBorder property.

The default value of this property is computed by the look and feel implementation.

See Also:

getViewportBorder(), setViewport(com.sun.java.swing.JViewport)

getViewportBorderBounds

public Rectangle getViewportBorderBounds()

createHorizontalScrollBar

public JScrollBar createHorizontalScrollBar()

Used by ScrollPaneUI implementations to create the horizontal scrollbar. Returns a JScrollPane.ScrollBar by default. Subclasses may override this method to force ScrollPaneUI implementations to use a JScrollBar subclass.

Returns:

a JScrollBar with a horizontal orientation

See Also:

JScrollBar

getHorizontalScrollBar

public JScrollBar getHorizontalScrollBar()

Returns:

the scrollbar that controls the viewports horizontal view position

See Also:

setHorizontalScrollBar(com.sun.java.swing.JScrollBar)

setHorizontalScrollBar

public void setHorizontalScrollBar(JScrollBar horizontalScrollBar)

Add the scrollbar that controls the viewports horizontal view position to the scrollpane. This is usually unneccessary, JScrollPane creates horizontal and vertical scrollbars by default.

See Also:

createHorizontalScrollBar(), getHorizontalScrollBar()

createVerticalScrollBar

public JScrollBar createVerticalScrollBar()

Used by ScrollPaneUI implementations to create the vertical scrollbar. Returns a JScrollPane.ScrollBar by default. Subclasses may override this method to force ScrollPaneUI implementations to use a JScrollBar subclass.

Returns:

a JScrollBar with a vertical orientation

See Also:

JScrollBar

getVerticalScrollBar

public JScrollBar getVerticalScrollBar()

Returns:

the scrollbar that controls the viewports vertical view position

See Also:

setVerticalScrollBar(com.sun.java.swing.JScrollBar)

setVerticalScrollBar

public void setVerticalScrollBar(JScrollBar verticalScrollBar)

Add the scrollbar that controls the viewports vertical view position to the scrollpane. This is usually unneccessary, JScrollPane creates vertical and vertical scrollbars by default.

See Also:

createVerticalScrollBar(), getVerticalScrollBar()

createViewport

protected JViewport createViewport()

Returns a new JViewport by default. Used to create the viewport (as needed) in setViewportView, setRowHeaderView, and setColumnHeaderView. Subclasses may override this method to return a subclass of JViewport.

Returns:

a JViewport

getViewport

public JViewport getViewport()

Returns the current JViewport.

Returns:

the JViewport currently in use

See Also:

setViewport(com.sun.java.swing.JViewport)

setViewport

public void setViewport(JViewport viewport)

Remove the old viewport (if there is one), force the viewPosition of the new viewport to be in the +x,+y quadrant, sync up the row and column headers (if there are any) with the new viewport, and finally sync the scrollbars and headers with the new viewport.

Most applications will find it more convenient to use setViewportView to add a viewport and a view to the scrollpane.

See Also:

createViewport(), getViewport(), setViewportView(java.awt.Component)

setViewportView

public void setViewportView(Component view)

Creates a viewport if neccessary and then sets its view. Applications that don't provide the view directly to the JScrollPane constructor should use this method to specify the scrollable child that's going to be displayed in the scrollpane, e.g.:

 JScrollPane scrollpane = new JScrollPane();
 scrollpane.setViewportView(myBigComponentToScroll);
 

Applications should not add children directly to the scrollpane.

Parameters:

view - the Component to add to the viewport

See Also:

setViewport(com.sun.java.swing.JViewport), JViewport.setView(java.awt.Component)

getRowHeader

public JViewport getRowHeader()

Returns:

the JViewport for the row header

See Also:

setRowHeader(com.sun.java.swing.JViewport)

setRowHeader

public void setRowHeader(JViewport rowHeader)

If an old rowHeader exists, remove it. If the new rowHeader isn't null, sync the y coordinate of the its viewPosition with the viewport (if there is one) and then add it to the ScrollPane.

Most applications will find it more convenient to use setRowHeaderView to add a row header component and its viewport to the scrollpane.

See Also:

getRowHeader(), setRowHeaderView(java.awt.Component)

setRowHeaderView

public void setRowHeaderView(Component view)

Creates a row-header viewport if neccessary, sets its view and then adds the row-header viewport to the scrollpane. For example:

 JScrollPane scrollpane = new JScrollPane();
 scrollpane.setViewportView(myBigComponentToScroll);
 scrollpane.setRowHeaderView(myBigComponentsRowHeader);
 

Parameters:

view - the Component to display as the row header

See Also:

setRowHeader(com.sun.java.swing.JViewport), JViewport.setView(java.awt.Component)

getColumnHeader

public JViewport getColumnHeader()

Returns:

the column header child for this scrollpane

See Also:

setColumnHeader(com.sun.java.swing.JViewport)

setColumnHeader

public void setColumnHeader(JViewport columnHeader)

If an old columnHeader exists, remove it. If the new columnHeader isn't null, sync the x coordinate of the its viewPosition with the viewport (if there is one) and then add it to the ScrollPane.

Most applications will find it more convenient to use setRowHeaderView to add a row header component and its viewport to the scrollpane.

See Also:

getColumnHeader(), setColumnHeaderView(java.awt.Component)

setColumnHeaderView

public void setColumnHeaderView(Component view)

Creates a column-header viewport if neccessary, sets its view and then adds the column-header viewport to the scrollpane. For example:

 JScrollPane scrollpane = new JScrollPane();
 scrollpane.setViewportView(myBigComponentToScroll);
 scrollpane.setColumnHeaderView(myBigComponentsColumnHeader);
 

Parameters:

view - the Component to display as the column header

See Also:

setColumnHeader(com.sun.java.swing.JViewport), JViewport.setView(java.awt.Component)

getCorner

public Component getCorner(String key)

Returns the component at the specified corner, where key is one of:

• JScrollPane.LOWER_LEFT_CORNER
• JScrollPane.LOWER_RIGHT_CORNER
• JScrollPane.UPPER_LEFT_CORNER
• JScrollPane.UPPER_RIGHT_CORNER

Returns:

the Component at the specified corner

See Also:

setCorner(java.lang.String, java.awt.Component)

setCorner

public void setCorner(String key,
                      Component corner)

Adds a child that will appear in one of the scroll panes corners, if there's room. For example with both scrollbars showing (on the right and bottom edges of the scrollpane) the lower left corner component will be shown in the space between ends of the two scrollbars. Legal values for the key are:

• JScrollPane.LOWER_LEFT_CORNER
• JScrollPane.LOWER_RIGHT_CORNER
• JScrollPane.UPPER_LEFT_CORNER
• JScrollPane.UPPER_RIGHT_CORNER

Although "corner" isn't doesn't match any beans property signature, PropertyChange events are generated with the property name set to the corner key.

Parameters:

key - identifies which corner the component will appear in

corner - any component

getAccessibleContext

public AccessibleContext getAccessibleContext()

Get the AccessibleContext associated with this JComponent

Specified by:

getAccessibleContext in interface Accessible

Returns:

the AccessibleContext of this JComponent

Overrides:

getAccessibleContext in class JComponent