| TreeWalker |

The `TreeWalkerviewView` is an interactive UI sample that displays the DOM tree. It show the progress of the tree traversal by moving the selection within the DOM tree. Buttons act as a control panel, allowing the user to interactively traverse the tree, remove nodes, add nodes, and view the results immediately in the tree.

The `TreeWalkerviewView` uses an example filter, `NameNodeFilter`, that can be controlled from the UI and a `DOMTreeFull` class that displays the full DOM tree with all the nodes.

The controls are called through to to the corresponding `TreeWalker` function. If you are familiar with the DOM Level 2 Traversal specification, these controls are fairly easy to understand.

| Document Order Traversal Group |

- Next - calls the `next()` functions and selects the next in the tree.
- Previous - calls the `previous()` function a and selects the previous node in the DOM tree.

| Walk Group |

| Parent, Previous Sibling, Next Sibling, First Child, Last Child - call the corresponding function in TreeWalker and show the result as a selected Node.

| Selected Node Group |

- current - set the current node to the selected node.
- remove - remove the selected node and update the tree. You must press a button to see next or previous node selection.
- add - add a text node. You must press a button to see next or previous node selection.

| Filter Settings Group |

- `createNodeTreeWalker` - calls the factory method to create a new `TreeWalker` with the corresponding `whatToShow` and `NodenameFilter` settings. The selected node becomes the TreeWalker root.
- `whatToShow` - you can singly or multiply select these values by pressing the control key and the `TreeWalker` is constrained to these types.
- `NodeNameFilter` - an empty string is converted to null and given to the `NodeNameFilter` example filter class provided.

- An empty string (null) matches ALL nodes.
- A non-empty string is forced to match node names.

| Running TreeWalker |

    java dom.traversal.TreeWalkerView <fileName>

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