Package docking.widgets.tree

Class GTreeLazyNode

java.lang.Object
docking.widgets.tree.GTreeNode
docking.widgets.tree.GTreeLazyNode
All Implemented Interfaces:
Cloneable, Comparable<GTreeNode>
Direct Known Subclasses:
DomainFolderNode, GTreeSlowLoadingNode
public abstract class GTreeLazyNode extends GTreeNode
Base class for GTreeNodes that populate their children on demand (typically when expanded). Also, children of this node can be unloaded by calling unloadChildren(). This can be used by nodes in large trees to save memory by unloading children that are no longer in the current tree view (collapsed). Of course, that decision would need to be balanced against the extra time to reload the nodes in the event that a filter is applied. Also, if some external event occurs that changes the set of children for a GTreeLazyNode, you can call unloadChildren() to clear any previously loaded children.

  • Constructor Details

    • GTreeLazyNode

      public GTreeLazyNode()

  • Method Details

    • generateChildren

      protected abstract List<GTreeNode> generateChildren()
      Subclasses must be able to generate their children nodes on demand by implementing this method.
      Overrides:
      generateChildren in class GTreeNode
      Returns:
      the list of GTreeNodes that make up the children for this node.

    • unloadChildren

      public void unloadChildren()
      Sets this lazy node back to the "unloaded" state such that if its children are accessed, it will reload its children as needed.

    • addNode

      public void addNode(GTreeNode node)
      Description copied from class: GTreeNode
      Adds the given node as a child to this node. Note: this method may be inefficient so if you have many nodes to add, you should use either GTreeNode.addNodes(List) or GTreeNode.setChildren(List)
      Overrides:
      addNode in class GTreeNode
      Parameters:
      node - the node to add as a child

    • addNode

      public void addNode(int index, GTreeNode node)
      Description copied from class: GTreeNode
      Adds the given node at the given index as a child to this node
      Overrides:
      addNode in class GTreeNode
      Parameters:
      index - the index to place the node
      node - the node to add as a child of this node

    • addNodes

      public void addNodes(List<GTreeNode> nodes)
      Description copied from class: GTreeNode
      Adds the given nodes as children to this node
      Overrides:
      addNodes in class GTreeNode
      Parameters:
      nodes - the nodes to add

    • removeAll

      public void removeAll()
      Description copied from class: GTreeNode
      Removes all children from this node. The children nodes will be disposed.
      Overrides:
      removeAll in class GTreeNode

    • removeNode

      public void removeNode(GTreeNode node)
      Description copied from class: GTreeNode
      Remove the given node from this node
      Overrides:
      removeNode in class GTreeNode
      Parameters:
      node - the to be removed

    • getParent

      public final GTreeNode getParent()
      Returns the parent of this node. Note: this method is deliberately not synchronized (See comments above)
      Returns:
      the parent of this node.

    • isRoot

      public final boolean isRoot()
      Returns true if this is a root node of a GTree
      Returns:
      true if this is a root node of a GTree

    • children

      protected final List<GTreeNode> children()

    • doSetChildrenAndFireEvent

      protected void doSetChildrenAndFireEvent(List<GTreeNode> childList)
      Sets the children of this node to the given list of child nodes and fires the appropriate tree event to kick the tree to update the display. Note: This method must be called from the swing thread because it will notify the underlying JTree.
      Parameters:
      childList - the list of child nodes to assign as children to this node
      See Also:

    • doSetChildren

      protected void doSetChildren(List<GTreeNode> childList)
      Sets the children of this node to the given list of child nodes, but does not notify the tree. This method does not have to be called from the swing thread. It is intended to be used by background threads that want to populate all or part of the tree, but wait until the bulk operations are completed before notifying the tree.
      Parameters:
      childList - the list of child nodes to assign as children to this node

    • doAddNode

      protected void doAddNode(GTreeNode node)
      Adds a node to this node's children. Must be called from the swing thread.
      Parameters:
      node - the node to add as a child to this node

    • doAddNode

      protected void doAddNode(int index, GTreeNode node)
      Adds a node to this node's children at the given index and notifies the tree. Must be called from the swing thread.
      Parameters:
      index - the index at which to add the new node
      node - the node to add as a child to this node

    • doRemoveNode

      protected void doRemoveNode(GTreeNode node)
      Removes the node from this node's children and notifies the tree. Must be called from the swing thread.
      Parameters:
      node - the node to remove

    • doAddNodes

      protected void doAddNodes(List<GTreeNode> nodes)
      Adds the given nodes to this node's children. Must be called from the swing thread.
      Parameters:
      nodes - the nodes to add to the children this node

    • clone

      public GTreeNode clone() throws CloneNotSupportedException
      Creates a clone of this node. The clone should contain a shallow copy of all the node's attributes except that the parent and children are null.
      Overrides:
      clone in class Object
      Returns:
      the clone of this object.
      Throws:
      CloneNotSupportedException - if some implementation prevents itself from being cloned.

    • dispose

      public void dispose()

    • isInProgress

      public final boolean isInProgress()
      Returns true if the node is in the process of loading its children. See GTreeSlowLoadingNode
      Returns:
      true if the node is in the process of loading its children.

    • isLoaded

      public boolean isLoaded()
      True if the children for this node have been loaded yet. Some GTree nodes are lazy in that they don't load their children until needed. Nodes that have the IN_PROGRESS node as it child is considered loaded if in the swing thread, otherwise they are considered not loaded.
      Returns:
      true if the children for this node have been loaded.

    • getTree

      public GTree getTree()
      Returns the GTree that this node is attached to
      Returns:
      the GTree that this node is attached to

    • doFireNodeAdded

      protected void doFireNodeAdded(GTreeNode newNode)

    • doFireNodeRemoved

      protected void doFireNodeRemoved(GTreeNode removedNode, int index)

    • doFireNodeStructureChanged

      protected void doFireNodeStructureChanged()

    • doFireNodeChanged

      protected void doFireNodeChanged()