Java™ Platform
Standard Ed. 6

javax.swing.tree
Class VariableHeightLayoutCache

java.lang.Object
  extended by javax.swing.tree.AbstractLayoutCache
      extended by javax.swing.tree.VariableHeightLayoutCache
All Implemented Interfaces:
RowMapper

public class VariableHeightLayoutCache
extends AbstractLayoutCache

NOTE: This will become more open in a future release.

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
 
Nested classes/interfaces inherited from class javax.swing.tree.AbstractLayoutCache
AbstractLayoutCache.NodeDimensions
 
Field Summary
 
Fields inherited from class javax.swing.tree.AbstractLayoutCache
nodeDimensions, rootVisible, rowHeight, treeModel, treeSelectionModel
 
Constructor Summary
VariableHeightLayoutCache()
           
 
Method Summary
 Rectangle getBounds(TreePath path, Rectangle placeIn)
          Returns the Rectangle enclosing the label portion into which the item identified by path will be drawn.
 boolean getExpandedState(TreePath path)
          Returns true if the path is expanded, and visible.
 TreePath getPathClosestTo(int x, int y)
          Returns the path to the node that is closest to x,y.
 TreePath getPathForRow(int row)
          Returns the path for row.
 int getPreferredHeight()
          Returns the preferred height.
 int getPreferredWidth(Rectangle bounds)
          Returns the preferred width and height for the region in visibleRegion.
 int getRowCount()
          Returns the number of visible rows.
 int getRowForPath(TreePath path)
          Returns the row where the last item identified in path is visible.
 int getVisibleChildCount(TreePath path)
          Returns the number of visible children for path.
 Enumeration<TreePath> getVisiblePathsFrom(TreePath path)
          Returns an Enumerator that increments over the visible paths starting at the passed in location.
 void invalidatePathBounds(TreePath path)
          Instructs the LayoutCache that the bounds for path are invalid, and need to be updated.
 void invalidateSizes()
          Informs the TreeState that it needs to recalculate all the sizes it is referencing.
 boolean isExpanded(TreePath path)
          Returns true if the value identified by path is currently expanded.
 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.
 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 treeNodesChanged(TreeModelEvent e)
          Invoked after a node (or a set of siblings) has changed in some way.
 void treeNodesInserted(TreeModelEvent e)
          Invoked after nodes have been inserted into the tree.
 void treeNodesRemoved(TreeModelEvent e)
          Invoked after nodes have been removed from the tree.
 void treeStructureChanged(TreeModelEvent e)
          Invoked after the tree has drastically changed structure from a given node down.
 
Methods inherited from class javax.swing.tree.AbstractLayoutCache
getModel, getNodeDimensions, getNodeDimensions, getRowHeight, getRowsForPaths, getSelectionModel, isFixedRowHeight, isRootVisible, setSelectionModel
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

VariableHeightLayoutCache

public VariableHeightLayoutCache()
Method Detail

setModel

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

Overrides:
setModel in class AbstractLayoutCache
Parameters:
newModel - the TreeModel that is to provide the data

setRootVisible

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

Overrides:
setRootVisible in class AbstractLayoutCache
Parameters:
rootVisible - true if the root node of the tree is to be displayed
See Also:
AbstractLayoutCache.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.

Overrides:
setRowHeight in class AbstractLayoutCache
Parameters:
rowHeight - the height of each cell, in pixels

setNodeDimensions

public void setNodeDimensions(AbstractLayoutCache.NodeDimensions nd)
Sets the renderer that is responsible for drawing nodes in the tree.

Overrides:
setNodeDimensions in class AbstractLayoutCache
Parameters:
nd - the renderer

setExpandedState

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

Specified by:
setExpandedState in class AbstractLayoutCache
Parameters:
path - the TreePath of interest
isExpanded - true if the path should be expanded, otherwise false

getExpandedState

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

Specified by:
getExpandedState in class AbstractLayoutCache
Parameters:
path - the path being queried
Returns:
true if the path is expanded and visible, otherwise false

getBounds

public Rectangle getBounds(TreePath path,
                           Rectangle placeIn)
Returns the Rectangle enclosing the label portion into which the item identified by path will be drawn.

Specified by:
getBounds in class AbstractLayoutCache
Parameters:
path - the path to be drawn
placeIn - the bounds of the enclosing rectangle
Returns:
the bounds of the enclosing rectangle or null if the node could not be ascertained

getPathForRow

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

Specified by:
getPathForRow in class AbstractLayoutCache
Parameters:
row - the location of interest
Returns:
the path for row, or null if row is not visible

getRowForPath

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

Specified by:
getRowForPath in class AbstractLayoutCache
Parameters:
path - the TreePath of interest
Returns:
the row where the last item in path is visible

getRowCount

public int getRowCount()
Returns the number of visible rows.

Specified by:
getRowCount in class AbstractLayoutCache
Returns:
the number of visible rows

invalidatePathBounds

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

Specified by:
invalidatePathBounds in class AbstractLayoutCache
Parameters:
path - the TreePath which is now invalid

getPreferredHeight

public int getPreferredHeight()
Returns the preferred height.

Overrides:
getPreferredHeight in class AbstractLayoutCache
Returns:
the preferred height

getPreferredWidth

public int getPreferredWidth(Rectangle bounds)
Returns the preferred width and height for the region in visibleRegion.

Overrides:
getPreferredWidth in class AbstractLayoutCache
Parameters:
bounds - the region being queried
Returns:
the preferred width for the passed in region

getPathClosestTo

public 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 will 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.

Specified by:
getPathClosestTo in class AbstractLayoutCache
Parameters:
x - the x-coordinate
y - the y-coordinate
Returns:
the path to the node that is closest to x, y

getVisiblePathsFrom

public 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.

Specified by:
getVisiblePathsFrom in class AbstractLayoutCache
Parameters:
path - the location in the TreePath to start
Returns:
an Enumerator that increments over the visible paths

getVisibleChildCount

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

Specified by:
getVisibleChildCount in class AbstractLayoutCache
Parameters:
path - the path being queried
Returns:
the number of visible children for path

invalidateSizes

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

Specified by:
invalidateSizes in class AbstractLayoutCache

isExpanded

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

Specified by:
isExpanded in class AbstractLayoutCache
Returns:
true if the value identified by path is currently expanded

treeNodesChanged

public 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).

Specified by:
treeNodesChanged in class AbstractLayoutCache
Parameters:
e - the TreeModelEvent of interest

treeNodesInserted

public 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.

Specified by:
treeNodesInserted in class AbstractLayoutCache
Parameters:
e - the TreeModelEvent of interest

treeNodesRemoved

public 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.

Specified by:
treeNodesRemoved in class AbstractLayoutCache
Parameters:
e - the TreeModelEvent of interest

treeStructureChanged

public 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.

Specified by:
treeStructureChanged in class AbstractLayoutCache
Parameters:
e - the TreeModelEvent of interest

Java™ Platform
Standard Ed. 6

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