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

All Methods

Instance Methods

Concrete Methods
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.
  - 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

Class VariableHeightLayoutCache

Nested Class Summary

Nested classes/interfaces inherited from class javax.swing.tree.AbstractLayoutCache

Field Summary

Fields inherited from class javax.swing.tree.AbstractLayoutCache

Constructor Summary

Constructors

Method Summary

Methods inherited from class javax.swing.tree.AbstractLayoutCache

Methods inherited from class java.lang.Object

Constructor Detail

VariableHeightLayoutCache

Method Detail

setModel

setRootVisible

setRowHeight

setNodeDimensions

setExpandedState

getExpandedState

getBounds

getPathForRow

getRowForPath

getRowCount

invalidatePathBounds

getPreferredHeight

getPreferredWidth

getPathClosestTo

getVisiblePathsFrom

getVisibleChildCount

invalidateSizes

isExpanded

treeNodesChanged

treeNodesInserted

treeNodesRemoved

treeStructureChanged