Java javax.swing.tree Class VariableHeightLayoutCache（JDK8）

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