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Java Standard Edition (SE)

VariableHeightLayoutCache


javax.swing.tree

Class 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.

    • 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
      • 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
      • 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
      • 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


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