javax.swing.tree

Class VariableHeightLayoutCache

java.lang.Object

javax.swing.tree.AbstractLayoutCache

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 JavaBeans™ 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

Constructors

Constructor and Description
VariableHeightLayoutCache()

Method Summary

Modifier and Type	Method and Description
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