Adds the specified component to the layout.

  Adds the specified component to the layout. The layout is
identified using one of:

• ScrollPaneConstants.VIEWPORT
  
• ScrollPaneConstants.VERTICAL_SCROLLBAR
  
• ScrollPaneConstants.HORIZONTAL_SCROLLBAR
  
• ScrollPaneConstants.ROW_HEADER
  
• ScrollPaneConstants.COLUMN_HEADER
  
• ScrollPaneConstants.LOWER_LEFT_CORNER
  
• ScrollPaneConstants.LOWER_RIGHT_CORNER
  
• ScrollPaneConstants.UPPER_LEFT_CORNER
  
• ScrollPaneConstants.UPPER_RIGHT_CORNER
  

Parameters:
- s - the component identifier
- c - the the component to be added
Throws:
- IllegalArgumentException - if s is an invalid key

  Removes an existing component.

  Removes an existing component. When a new component, such as the left corner, or vertical scrollbar, is added, the old one, if it exists, must be removed.

This method returns newC. If oldC is not equal to newC and is non-null, it will be removed from its parent.
Returns: the newC
Parameters:
- oldC - the Component to replace
- newC - the Component to add

  Returns the JViewport object that is the column header.

  Returns the JViewport object that is the column header.
Returns: the JViewport object that is the column header
See Also: JScrollPane.getColumnHeader(),

  Returns the Component at the specified corner.

  Returns the Component at the specified corner.
Returns: the Component at the specified corner, as defined in {@link ScrollPaneConstants}; if key is not one of the four corners, null is returned
Parameters:
- key - the String specifying the corner
See Also: JScrollPane.getCorner(java.lang.String),

  Returns the JScrollBar object that handles horizontal scrolling.

  Returns the JScrollBar object that handles horizontal scrolling.
Returns: the JScrollBar object that handles horizontal scrolling
See Also: JScrollPane.getHorizontalScrollBar(),

  Returns the horizontal scrollbar-display policy.

  Returns the horizontal scrollbar-display policy.
Returns: an integer giving the display policy
See Also: ScrollPaneLayout.setHorizontalScrollBarPolicy(int),

  Returns the JViewport object that is the row header.

  Returns the JViewport object that is the row header.
Returns: the JViewport object that is the row header
See Also: JScrollPane.getRowHeader(),

  Returns the JScrollBar object that handles vertical scrolling.

  Returns the JScrollBar object that handles vertical scrolling.
Returns: the JScrollBar object that handles vertical scrolling
See Also: JScrollPane.getVerticalScrollBar(),

  Returns the vertical scrollbar-display policy.

  Returns the vertical scrollbar-display policy.
Returns: an integer giving the display policy
See Also: ScrollPaneLayout.setVerticalScrollBarPolicy(int),

  Returns the JViewport object that displays the scrollable contents.

  Returns the JViewport object that displays the
scrollable contents.
Returns: the JViewport object that displays the scrollable contents
See Also: JScrollPane.getViewport(),

  Returns the bounds of the border around the specified scroll pane's viewport.

  Returns the bounds of the border around the specified scroll pane's
viewport.
Returns: the size and position of the viewport border

  Lays out the scrollpane.

  Lays out the scrollpane. The positioning of components depends on
the following constraints:

• The row header, if present and visible, gets its preferred
  width and the viewport's height.
  
  
• The column header, if present and visible, gets its preferred
  height and the viewport's width.
  
  
• If a vertical scrollbar is needed, i.e. if the viewport's extent
  height is smaller than its view height or if the displayPolicy
  is ALWAYS, it's treated like the row header with respect to its
  dimensions and is made visible.
  
  
• If a horizontal scrollbar is needed, it is treated like the
  column header (see the paragraph above regarding the vertical scrollbar).
  
  
• If the scrollpane has a non-null
viewportBorder, then space is allocated for that.
  
  
• The viewport gets the space available after accounting for
  the previous constraints.
  
  
• The corner components, if provided, are aligned with the
  ends of the scrollbars and headers. If there is a vertical
  scrollbar, the right corners appear; if there is a horizontal
  scrollbar, the lower corners appear; a row header gets left
  corners, and a column header gets upper corners.
  

Parameters:
- parent - the Container to lay out

  The minimum size of a ScrollPane is the size of the insets plus minimum size of the viewport, plus the scrollpane's viewportBorder insets, plus the minimum size of the visible headers, plus the minimum size of the scrollbars whose displayPolicy isn't NEVER.

  The minimum size of a ScrollPane is the size of the insets
plus minimum size of the viewport, plus the scrollpane's
viewportBorder insets, plus the minimum size
of the visible headers, plus the minimum size of the
scrollbars whose displayPolicy isn't NEVER.
Returns: a Dimension object specifying the minimum size
Parameters:
- parent - the Container that will be laid out

  The preferred size of a ScrollPane is the size of the insets, plus the preferred size of the viewport, plus the preferred size of the visible headers, plus the preferred size of the scrollbars that will appear given the current view and the current scrollbar displayPolicies.

  The preferred size of a ScrollPane is the size of the insets, plus the preferred size of the viewport, plus the preferred size of the visible headers, plus the preferred size of the scrollbars that will appear given the current view and the current scrollbar displayPolicies.

Note that the rowHeader is calculated as part of the preferred width and the colHeader is calculated as part of the preferred size.
Returns: a Dimension object specifying the preferred size of the viewport and any scrollbars
Parameters:
- parent - the Container that will be laid out
See Also: ViewportLayout, LayoutManager,

  Removes the specified component from the layout.

  Removes the specified component from the layout.
Parameters:
- c - the component to remove

  Sets the horizontal scrollbar-display policy.

  Sets the horizontal scrollbar-display policy.
The options are:

• ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED
  
• ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER
  
• ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS
  

Note: Applications should use the JScrollPane version
of this method. It only exists for backwards compatibility
with the Swing 1.0.2 (and earlier) versions of this class.
Parameters:
- x - an int giving the display policy
Throws:
- IllegalArgumentException - if x is not a valid horizontal scrollbar policy, as listed above

  Sets the vertical scrollbar-display policy.

  Sets the vertical scrollbar-display policy. The options
are:

• ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED
  
• ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER
  
• ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS
  

Note: Applications should use the JScrollPane version
of this method. It only exists for backwards compatibility
with the Swing 1.0.2 (and earlier) versions of this class.
Parameters:
- x - an integer giving the display policy
Throws:
- IllegalArgumentException - if x is an invalid vertical scroll bar policy, as listed above

  This method is invoked after the ScrollPaneLayout is set as the LayoutManager of a JScrollPane.

  This method is invoked after the ScrollPaneLayout is set as the
LayoutManager of a JScrollPane.
It initializes all of the internal fields that
are ordinarily set by addLayoutComponent. For example:

 ScrollPaneLayout mySPLayout = new ScrollPanelLayout() {
     public void layoutContainer(Container p) {
         super.layoutContainer(p);
         // do some extra work here ...
     }
 };
 scrollpane.setLayout(mySPLayout):