Java javax.swing.tree Class FixedHeightLayoutCache（JDK8）

Constructor Detail

• FixedHeightLayoutCache

  public FixedHeightLayoutCache()

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 rowHeight is less than or equal to 0 this will throw an IllegalArgumentException.

  Overrides:

  setRowHeight in class AbstractLayoutCache

  Parameters:

  rowHeight - the height of each cell, in pixels

• getRowCount

  public int getRowCount()

  Returns the number of visible rows.

  Specified by:

  getRowCount in class AbstractLayoutCache

  Returns:

  the number of rows being displayed

• invalidatePathBounds

  public void invalidatePathBounds(TreePath path)

  Does nothing, FixedHeightLayoutCache doesn't cache width, and that is all that could change.

  Specified by:

  invalidatePathBounds in class AbstractLayoutCache

  Parameters:

  path - the path being updated

• 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 row is currently expanded.

  Specified by:

  isExpanded in class AbstractLayoutCache

• getBounds

  public Rectangle getBounds(TreePath path,
                             Rectangle placeIn)

  Returns a rectangle giving the bounds needed to draw path.

  Specified by:

  getBounds in 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.

  Specified by:

  getPathForRow in class AbstractLayoutCache

  Parameters:

  row - the row being queried

  Returns:

  the TreePath for the given row

• 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.

  Specified by:

  getRowForPath in class AbstractLayoutCache

  Parameters:

  path - the TreePath being queried

  Returns:

  the row where the last item in path is visible or -1 if any elements in path aren't currently visible

• 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.

  Specified by:

  getPathClosestTo in class AbstractLayoutCache

  Parameters:

  x - the horizontal component of the desired location

  y - the vertical component of the desired location

  Returns:

  the TreePath closest to the specified point

• getVisibleChildCount

  public int getVisibleChildCount(TreePath path)

  Returns the number of visible children for row.

  Specified by:

  getVisibleChildCount in class AbstractLayoutCache

  Parameters:

  path - the path being queried

  Returns:

  the number of visible children for the specified path

• 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 starting location for the enumeration

  Returns:

  the Enumerator starting at the desired location

• 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 path being expanded or collapsed

  isExpanded - true if the path should be expanded, false otherwise

• 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, false otherwise

• 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

• 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

• 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

• 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