Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class VariableHeightLayoutCache - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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javax.swing.tree
Class VariableHeightLayoutCache

java.lang.Object
  |
  +--javax.swing.tree.AbstractLayoutCache
        |
        +--javax.swing.tree.VariableHeightLayoutCache

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. A future release of Swing will provide support for long term persistence.

Inner classes inherited from class javax.swing.tree.AbstractLayoutCache

AbstractLayoutCache.NodeDimensions

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 that the item identified by row will be drawn into.

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 passed in row.

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 that the last item identified in path is visible at.

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

Enumeration 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 row 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, getPreferredHeight, 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

Tags copied from class: AbstractLayoutCache

Parameters:: nd - a NodeDimensions object

setExpandedState

public void setExpandedState(TreePath path,
                             boolean isExpanded)

Marks the path path expanded state to isExpanded.

Overrides:: setExpandedState in class AbstractLayoutCache

getExpandedState

public boolean getExpandedState(TreePath path)

Returns true if the path is expanded, and visible.

Overrides:: getExpandedState in class AbstractLayoutCache

getBounds

public Rectangle getBounds(TreePath path,
                           Rectangle placeIn)

Returns the Rectangle enclosing the label portion that the item identified by row will be drawn into.

Overrides:: getBounds in class AbstractLayoutCache

Tags copied from class: AbstractLayoutCache

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 TreePath getPathForRow(int row)

Returns the path for passed in row. If row is not visible null is returned.

Overrides:: getPathForRow in class AbstractLayoutCache

getRowForPath

public 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.

Overrides:: getRowForPath in class AbstractLayoutCache

getRowCount

public int getRowCount()

Returns the number of visible rows.

Overrides:: getRowCount in class AbstractLayoutCache

invalidatePathBounds

public void invalidatePathBounds(TreePath path)

Instructs the LayoutCache that the bounds for path are invalid, and need to be updated.

Overrides:: invalidatePathBounds in class AbstractLayoutCache

getPreferredWidth

public int getPreferredWidth(Rectangle bounds)

Returns the preferred width and height for the region in visibleRegion.

Overrides:: getPreferredWidth in class AbstractLayoutCache

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'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.

Overrides:: getPathClosestTo in class AbstractLayoutCache

getVisiblePathsFrom

public Enumeration 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.

Overrides:: getVisiblePathsFrom in class AbstractLayoutCache

getVisibleChildCount

public int getVisibleChildCount(TreePath path)

Returns the number of visible children for row.

Overrides:: getVisibleChildCount in class AbstractLayoutCache

invalidateSizes

public void invalidateSizes()

Informs the TreeState that it needs to recalculate all the sizes it is referencing.

Overrides:: invalidateSizes in class AbstractLayoutCache

isExpanded

public boolean isExpanded(TreePath path)

Returns true if the value identified by row is currently expanded.

Overrides:: isExpanded in class AbstractLayoutCache

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).

Overrides:: treeNodesChanged in class AbstractLayoutCache

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.

Overrides:: treeNodesInserted in class AbstractLayoutCache

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.

Overrides:: treeNodesRemoved in class AbstractLayoutCache

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.

Overrides:: treeStructureChanged in class AbstractLayoutCache