Java™ Platform
Standard Ed. 6

javax.swing.tree
Class AbstractLayoutCache

java.lang.Object
  extended by javax.swing.tree.AbstractLayoutCache
All Implemented Interfaces:
RowMapper
Direct Known Subclasses:
FixedHeightLayoutCache, VariableHeightLayoutCache

public abstract class AbstractLayoutCache
extends Object
implements RowMapper

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 applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeansTM has been added to the java.beans package. Please see XMLEncoder.


Nested Class Summary
static class AbstractLayoutCache.NodeDimensions
          Used by AbstractLayoutCache to determine the size and x origin of a particular node.
 
Field Summary
protected  AbstractLayoutCache.NodeDimensions nodeDimensions
          Object responsible for getting the size of a node.
protected  boolean rootVisible
          True if the root node is displayed, false if its children are the highest visible nodes.
protected  int rowHeight
          Height to use for each row.
protected  TreeModel treeModel
          Model providing information.
protected  TreeSelectionModel treeSelectionModel
          Selection model.
 
Constructor Summary
AbstractLayoutCache()
           
 
Method Summary
abstract  Rectangle getBounds(TreePath path, Rectangle placeIn)
          Returns a rectangle giving the bounds needed to draw path.
abstract  boolean getExpandedState(TreePath path)
          Returns true if the path is expanded, and visible.
 TreeModel getModel()
          Returns the TreeModel that is providing the data.
 AbstractLayoutCache.NodeDimensions getNodeDimensions()
          Returns the object that renders nodes in the tree, and which is responsible for calculating the dimensions of individual nodes.
protected  Rectangle getNodeDimensions(Object value, int row, int depth, boolean expanded, Rectangle placeIn)
          Returns, by reference in placeIn, the size needed to represent value.
abstract  TreePath getPathClosestTo(int x, int y)
          Returns the path to the node that is closest to x,y.
abstract  TreePath getPathForRow(int row)
          Returns the path for passed in row.
 int getPreferredHeight()
          Returns the preferred height.
 int getPreferredWidth(Rectangle bounds)
          Returns the preferred width for the passed in region.
abstract  int getRowCount()
          Number of rows being displayed.
abstract  int getRowForPath(TreePath path)
          Returns the row that the last item identified in path is visible at.
 int getRowHeight()
          Returns the height of each row.
 int[] getRowsForPaths(TreePath[] paths)
          Returns the rows that the TreePath instances in path are being displayed at.
 TreeSelectionModel getSelectionModel()
          Returns the model used to maintain the selection.
abstract  int getVisibleChildCount(TreePath path)
          Returns the number of visible children for row.
abstract  Enumeration<TreePath> getVisiblePathsFrom(TreePath path)
          Returns an Enumerator that increments over the visible paths starting at the passed in location.
abstract  void invalidatePathBounds(TreePath path)
          Instructs the LayoutCache that the bounds for path are invalid, and need to be updated.
abstract  void invalidateSizes()
          Informs the TreeState that it needs to recalculate all the sizes it is referencing.
abstract  boolean isExpanded(TreePath path)
          Returns true if the value identified by row is currently expanded.
protected  boolean isFixedRowHeight()
          Returns true if the height of each row is a fixed size.
 boolean isRootVisible()
          Returns true if the root node of the tree is displayed.
abstract  void setExpandedState(TreePath path, boolean isExpanded)
          Marks the path path expanded state to isExpanded.
 void setModel(TreeModel newModel)
          Sets the TreeModel that will provide the data.
 void setNodeDimensions(AbstractLayoutCache.NodeDimensions nd)
          Sets the renderer that is responsible for drawing nodes in the tree and which is threfore responsible for calculating the dimensions of individual nodes.
 void setRootVisible(boolean rootVisible)
          Determines whether or not the root node from the TreeModel is visible.
 void setRowHeight(int rowHeight)
          Sets the height of each cell.
 void setSelectionModel(TreeSelectionModel newLSM)
          Sets the TreeSelectionModel used to manage the selection to new LSM.
abstract  void treeNodesChanged(TreeModelEvent e)
           Invoked after a node (or a set of siblings) has changed in some way.
abstract  void treeNodesInserted(TreeModelEvent e)
          Invoked after nodes have been inserted into the tree.
abstract  void treeNodesRemoved(TreeModelEvent e)
          Invoked after nodes have been removed from the tree.
abstract  void treeStructureChanged(TreeModelEvent e)
          Invoked after the tree has drastically changed structure from a given node down.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

nodeDimensions

protected AbstractLayoutCache.NodeDimensions nodeDimensions
Object responsible for getting the size of a node.


treeModel

protected TreeModel treeModel
Model providing information.


treeSelectionModel

protected TreeSelectionModel treeSelectionModel
Selection model.


rootVisible

protected boolean rootVisible
True if the root node is displayed, false if its children are the highest visible nodes.


rowHeight

protected int rowHeight
Height to use for each row. If this is <= 0 the renderer will be used to determine the height for each row.

Constructor Detail

AbstractLayoutCache

public AbstractLayoutCache()
Method Detail

setNodeDimensions

public void setNodeDimensions(AbstractLayoutCache.NodeDimensions nd)
Sets the renderer that is responsible for drawing nodes in the tree and which is threfore responsible for calculating the dimensions of individual nodes.

Parameters:
nd - a NodeDimensions object

getNodeDimensions

public AbstractLayoutCache.NodeDimensions getNodeDimensions()
Returns the object that renders nodes in the tree, and which is responsible for calculating the dimensions of individual nodes.

Returns:
the NodeDimensions object

setModel

public void setModel(TreeModel newModel)
Sets the TreeModel that will provide the data.

Parameters:
newModel - the TreeModel that is to provide the data

getModel

public TreeModel getModel()
Returns the TreeModel that is providing the data.

Returns:
the TreeModel that is providing the data

setRootVisible

public void setRootVisible(boolean rootVisible)
Determines whether or not the root node from the TreeModel is visible.

Parameters:
rootVisible - true if the root node of the tree is to be displayed
See Also:
rootVisible

isRootVisible

public boolean isRootVisible()
Returns true if the root node of the tree is displayed.

Returns:
true if the root node of the tree is displayed
See Also:
rootVisible

setRowHeight

public void setRowHeight(int rowHeight)
Sets the height of each cell. If the specified value is less than or equal to zero the current cell renderer is queried for each row's height.

Parameters:
rowHeight - the height of each cell, in pixels

getRowHeight

public int getRowHeight()
Returns the height of each row. If the returned value is less than or equal to 0 the height for each row is determined by the renderer.


setSelectionModel

public void setSelectionModel(TreeSelectionModel newLSM)
Sets the TreeSelectionModel used to manage the selection to new LSM.

Parameters:
newLSM - the new TreeSelectionModel

getSelectionModel

public TreeSelectionModel getSelectionModel()
Returns the model used to maintain the selection.

Returns:
the treeSelectionModel

getPreferredHeight

public int getPreferredHeight()
Returns the preferred height.

Returns:
the preferred height

getPreferredWidth

public int getPreferredWidth(Rectangle bounds)
Returns the preferred width for the passed in region. The region is defined by the path closest to (bounds.x, bounds.y) and ends at bounds.height + bounds.y. If bounds is null, the preferred width for all the nodes will be returned (and this may be a VERY expensive computation).

Parameters:
bounds - the region being queried
Returns:
the preferred width for the passed in region

isExpanded

public abstract boolean isExpanded(TreePath path)
Returns true if the value identified by row is currently expanded.


getBounds

public abstract Rectangle getBounds(TreePath path,
                                    Rectangle placeIn)
Returns a rectangle giving the bounds needed to draw path.

Parameters:
path - a TreePath specifying a node
placeIn - a Rectangle object giving the available space
Returns:
a Rectangle object specifying the space to be used

getPathForRow

public abstract TreePath getPathForRow(int row)
Returns the path for passed in row. If row is not visible null is returned.

Parameters:
row - the row being queried
Returns:
the TreePath for the given row

getRowForPath

public abstract int getRowForPath(TreePath path)
Returns the row that the last item identified in path is visible at. Will return -1 if any of the elements in path are not currently visible.

Parameters:
path - the TreePath being queried
Returns:
the row where the last item in path is visible or -1 if any elements in path aren't currently visible

getPathClosestTo

public abstract TreePath getPathClosestTo(int x,
                                          int y)
Returns the path to the node that is closest to x,y. If there is nothing currently visible this will return null, otherwise it'll always return a valid path. If you need to test if the returned object is exactly at x, y you should get the bounds for the returned path and test x, y against that.

Parameters:
x - the horizontal component of the desired location
y - the vertical component of the desired location
Returns:
the TreePath closest to the specified point

getVisiblePathsFrom

public abstract Enumeration<TreePath> getVisiblePathsFrom(TreePath path)
Returns an Enumerator that increments over the visible paths starting at the passed in location. The ordering of the enumeration is based on how the paths are displayed. The first element of the returned enumeration will be path, unless it isn't visible, in which case null will be returned.

Parameters:
path - the starting location for the enumeration
Returns:
the Enumerator starting at the desired location

getVisibleChildCount

public abstract int getVisibleChildCount(TreePath path)
Returns the number of visible children for row.

Parameters:
path - the path being queried
Returns:
the number of visible children for the specified path

setExpandedState

public abstract void setExpandedState(TreePath path,
                                      boolean isExpanded)
Marks the path path expanded state to isExpanded.

Parameters:
path - the path being expanded or collapsed
isExpanded - true if the path should be expanded, false otherwise

getExpandedState

public abstract boolean getExpandedState(TreePath path)
Returns true if the path is expanded, and visible.

Parameters:
path - the path being queried
Returns:
true if the path is expanded and visible, false otherwise

getRowCount

public abstract int getRowCount()
Number of rows being displayed.

Returns:
the number of rows being displayed

invalidateSizes

public abstract void invalidateSizes()
Informs the TreeState that it needs to recalculate all the sizes it is referencing.


invalidatePathBounds

public abstract void invalidatePathBounds(TreePath path)
Instructs the LayoutCache that the bounds for path are invalid, and need to be updated.

Parameters:
path - the path being updated

treeNodesChanged

public abstract void treeNodesChanged(TreeModelEvent e)

Invoked after a node (or a set of siblings) has changed in some way. The node(s) have not changed locations in the tree or altered their children arrays, but other attributes have changed and may affect presentation. Example: the name of a file has changed, but it is in the same location in the file system.

e.path() returns the path the parent of the changed node(s).

e.childIndices() returns the index(es) of the changed node(s).

Parameters:
e - the TreeModelEvent

treeNodesInserted

public abstract void treeNodesInserted(TreeModelEvent e)

Invoked after nodes have been inserted into the tree.

e.path() returns the parent of the new nodes

e.childIndices() returns the indices of the new nodes in ascending order.

Parameters:
e - the TreeModelEvent

treeNodesRemoved

public abstract void treeNodesRemoved(TreeModelEvent e)

Invoked after nodes have been removed from the tree. Note that if a subtree is removed from the tree, this method may only be invoked once for the root of the removed subtree, not once for each individual set of siblings removed.

e.path() returns the former parent of the deleted nodes.

e.childIndices() returns the indices the nodes had before they were deleted in ascending order.

Parameters:
e - the TreeModelEvent

treeStructureChanged

public abstract void treeStructureChanged(TreeModelEvent e)

Invoked after the tree has drastically changed structure from a given node down. If the path returned by e.getPath() is of length one and the first element does not identify the current root node the first element should become the new root of the tree.

e.path() holds the path to the node.

e.childIndices() returns null.

Parameters:
e - the TreeModelEvent

getRowsForPaths

public int[] getRowsForPaths(TreePath[] paths)
Returns the rows that the TreePath instances in path are being displayed at. This method should return an array of the same length as that passed in, and if one of the TreePaths in path is not valid its entry in the array should be set to -1.

Specified by:
getRowsForPaths in interface RowMapper
Parameters:
paths - the array of TreePaths being queried
Returns:
an array of the same length that is passed in containing the rows that each corresponding where each TreePath is displayed; if paths is null, null is returned

getNodeDimensions

protected Rectangle getNodeDimensions(Object value,
                                      int row,
                                      int depth,
                                      boolean expanded,
                                      Rectangle placeIn)
Returns, by reference in placeIn, the size needed to represent value. If inPlace is null, a newly created Rectangle should be returned, otherwise the value should be placed in inPlace and returned. This will return null if there is no renderer.

Parameters:
value - the value to be represented
row - row being queried
depth - the depth of the row
expanded - true if row is expanded, false otherwise
placeIn - a Rectangle containing the size needed to represent value
Returns:
a Rectangle containing the node dimensions, or null if node has no dimension

isFixedRowHeight

protected boolean isFixedRowHeight()
Returns true if the height of each row is a fixed size.


Java™ Platform
Standard Ed. 6

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