Module java.desktop
Package javax.swing.tree

Class AbstractLayoutCache

java.lang.Object
javax.swing.tree.AbstractLayoutCache
All Implemented Interfaces:
RowMapper
Direct Known Subclasses:
FixedHeightLayoutCache, VariableHeightLayoutCache
public abstract class AbstractLayoutCache extends Object implements RowMapper
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.

  • Field Details

    • nodeDimensions

      protected AbstractLayoutCache.NodeDimensions nodeDimensions
      Object responsible for getting the size of a node.

    • treeModel

      protected TreeModel treeModel
      Model providing information.

    • treeSelectionModel

      protected TreeSelectionModel treeSelectionModel
      Selection model.

    • rootVisible

      protected boolean rootVisible
      True if the root node is displayed, false if its children are the highest visible nodes.

    • rowHeight

      protected int rowHeight
      Height to use for each row. If this is <= 0 the renderer will be used to determine the height for each row.

  • Constructor Details

    • AbstractLayoutCache

      protected AbstractLayoutCache()
      Constructor for subclasses to call.

  • Method Details

    • setNodeDimensions

      public void setNodeDimensions(AbstractLayoutCache.NodeDimensions nd)
      Sets the renderer that is responsible for drawing nodes in the tree and which is therefore responsible for calculating the dimensions of individual nodes.
      Parameters:
      nd - a NodeDimensions object

    • getNodeDimensions

      public AbstractLayoutCache.NodeDimensions getNodeDimensions()
      Returns the object that renders nodes in the tree, and which is responsible for calculating the dimensions of individual nodes.
      Returns:
      the NodeDimensions object

    • setModel

      public void setModel(TreeModel newModel)
      Sets the TreeModel that will provide the data.
      Parameters:
      newModel - the TreeModel that is to provide the data

    • getModel

      public TreeModel getModel()
      Returns the TreeModel that is providing the data.
      Returns:
      the TreeModel that is providing the data

    • setRootVisible

      @BeanProperty(description="Whether or not the root node from the TreeModel is visible.") public void setRootVisible(boolean rootVisible)
      Determines whether or not the root node from the TreeModel is visible.
      Parameters:
      rootVisible - true if the root node of the tree is to be displayed
      See Also:

    • isRootVisible

      public boolean isRootVisible()
      Returns true if the root node of the tree is displayed.
      Returns:
      true if the root node of the tree is displayed
      See Also:

    • setRowHeight

      @BeanProperty(description="The height of each cell.") 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.
      Parameters:
      rowHeight - the height of each cell, in pixels

    • getRowHeight

      public int getRowHeight()
      Returns the height of each row. If the returned value is less than or equal to 0 the height for each row is determined by the renderer.
      Returns:
      the height of each row

    • setSelectionModel

      public void setSelectionModel(TreeSelectionModel newLSM)
      Sets the TreeSelectionModel used to manage the selection to new LSM.
      Parameters:
      newLSM - the new TreeSelectionModel

    • getSelectionModel

      public TreeSelectionModel getSelectionModel()
      Returns the model used to maintain the selection.
      Returns:
      the treeSelectionModel

    • getPreferredHeight

      public int getPreferredHeight()
      Returns the preferred height.
      Returns:
      the preferred height

    • getPreferredWidth

      public int getPreferredWidth(Rectangle bounds)
      Returns the preferred width for the passed in region. The region is defined by the path closest to (bounds.x, bounds.y) and ends at bounds.height + bounds.y. If bounds is null, the preferred width for all the nodes will be returned (and this may be a VERY expensive computation).
      Parameters:
      bounds - the region being queried
      Returns:
      the preferred width for the passed in region

    • isExpanded

      public abstract boolean isExpanded(TreePath path)
      Returns true if the value identified by row is currently expanded.
      Parameters:
      path - TreePath to check
      Returns:
      whether TreePath is expanded

    • getBounds

      public abstract Rectangle getBounds(TreePath path, Rectangle placeIn)
      Returns a rectangle giving the bounds needed to draw path.
      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 abstract TreePath getPathForRow(int row)
      Returns the path for passed in row. If row is not visible null is returned.
      Parameters:
      row - the row being queried
      Returns:
      the TreePath for the given row

    • getRowForPath

      public abstract 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.
      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 abstract 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.
      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

    • getVisiblePathsFrom

      public abstract 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. The first element of the returned enumeration will be path, unless it isn't visible, in which case null will be returned.
      Parameters:
      path - the starting location for the enumeration
      Returns:
      the Enumerator starting at the desired location

    • getVisibleChildCount

      public abstract int getVisibleChildCount(TreePath path)
      Returns the number of visible children for row.
      Parameters:
      path - the path being queried
      Returns:
      the number of visible children for the specified path

    • setExpandedState

      public abstract void setExpandedState(TreePath path, boolean isExpanded)
      Marks the path path expanded state to isExpanded.
      Parameters:
      path - the path being expanded or collapsed
      isExpanded - true if the path should be expanded, false otherwise

    • getExpandedState

      public abstract boolean getExpandedState(TreePath path)
      Returns true if the path is expanded, and visible.
      Parameters:
      path - the path being queried
      Returns:
      true if the path is expanded and visible, false otherwise

    • getRowCount

      public abstract int getRowCount()
      Number of rows being displayed.
      Returns:
      the number of rows being displayed

    • invalidateSizes

      public abstract void invalidateSizes()
      Informs the TreeState that it needs to recalculate all the sizes it is referencing.

    • invalidatePathBounds

      public abstract void invalidatePathBounds(TreePath path)
      Instructs the LayoutCache that the bounds for path are invalid, and need to be updated.
      Parameters:
      path - the path being updated

    • treeNodesChanged

      public abstract 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).

      Parameters:
      e - the TreeModelEvent

    • treeNodesInserted

      public abstract 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.

      Parameters:
      e - the TreeModelEvent

    • treeNodesRemoved

      public abstract 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.

      Parameters:
      e - the TreeModelEvent

    • treeStructureChanged

      public abstract 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.

      Parameters:
      e - the TreeModelEvent

    • getRowsForPaths

      public int[] getRowsForPaths(TreePath[] paths)
      Returns the rows that the TreePath instances in path are being displayed at. This method should return an array of the same length as that passed in, and if one of the TreePaths in path is not valid its entry in the array should be set to -1.
      Specified by:
      getRowsForPaths in interface RowMapper
      Parameters:
      paths - the array of TreePaths being queried
      Returns:
      an array of the same length that is passed in containing the rows that each corresponding where each TreePath is displayed; if paths is null, null is returned

    • getNodeDimensions

      protected Rectangle getNodeDimensions(Object value, int row, int depth, boolean expanded, Rectangle placeIn)
      Returns, by reference in placeIn, the size needed to represent value. If inPlace is null, a newly created Rectangle should be returned, otherwise the value should be placed in inPlace and returned. This will return null if there is no renderer.
      Parameters:
      value - the value to be represented
      row - row being queried
      depth - the depth of the row
      expanded - true if row is expanded, false otherwise
      placeIn - a Rectangle containing the size needed to represent value
      Returns:
      a Rectangle containing the node dimensions, or null if node has no dimension

    • isFixedRowHeight

      protected boolean isFixedRowHeight()
      Returns true if the height of each row is a fixed size.
      Returns:
      whether the height of each row is a fixed size