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Strictly speaking, routed events can be bubbling (as just described) or tunneling in nature. Tunneling events (which all begin with the Preview suffix e.g., PreviewMouseDown) drill down from the topmost element into the inner scopes of the object tree. By and large, each bubbling event in the WPF base class libraries is paired with a related tunneling event that fires before the bubbling counterpart. For example, before the bubbling MouseDown event fires, the tunneling PreviewMouseDown event fires first. Handling a tunneling event looks just like the processing of handling any other events; simply assign the event handler name in XAML (or, if needed, use the corresponding C# event-handling syntax in your code file) and implement the handler in the code file. Just to illustrate the interplay of tunneling and bubbling events, begin by handling the PreviewMouseDown event for the outerEllipse object: <Ellipse Name = "outerEllipse" Fill ="Green" Height ="25" MouseDown ="outerEllipse_MouseDown" PreviewMouseDown ="outerEllipse_PreviewMouseDown" Width ="50" Cursor="Hand" Canvas.Left="25" Canvas.Top="12"/> Next, retrofit the current C# class definition by updating each event handler (for all objects) to append data about the current event into a string member variable named mouseActivity, using the incoming event args object. This will allow you to observe the flow of events firing in the background:

When you want to give your custom type the ability to return an identical copy of itself to the caller, you may implement the standard ICloneable interface. As shown at the start of this chapter, this type defines a single method named Clone(): public interface ICloneable { object Clone(); }

Caching Data with cache_set()

Note The usefulness of the ICloneable interface is a topic of debate within the .NET community. The problem has to do with the fact that the official specification does not explicitly say that objects implementing this interface must return a deep copy of the object (i.e., internal reference types of an object result in brand-new objects with identical state). Thus, it is technically possible that objects implementing ICloneable actually return a shallow copy of the interface (i.e., internal references point to the same object on the heap), which clearly generates a good deal of confusion. In our example, I am assuming we are implementing Clone() to return a full, deep copy of the object.

Obviously, the implementation of the Clone() method varies among types. However, the basic functionality tends to be the same: copy the values of your member variables into a new object instance of the same type, and return it to the user. To illustrate, ponder the following update to the Point class: // The Point public class { public int public int now supports "clone-ability." Point : ICloneable X { get; set; } Y { get; set; }

cache_set() is used for writing data to the cache. The function signature follows: cache_set($cid, $data, $bin = 'cache', $expire = CACHE_PERMANENT) And the function parameters are as follows: $cid: A unique cache ID string that acts as a key to the data. Colons are used to delimit the hierarchy of possibilities. $bin: The name of the cache bin to store the data in. Valid core values are 'cache_block', 'cache_bootstrap', 'cache_field', 'cache_filter', 'cache_form', 'cache_menu', 'cache_page', 'cache_update', or 'cache' for the default cache. $data: The data to store in the cache. PHP objects and arrays will be automatically serialized. $expire: The length of time for which the cached data is valid. Possible values are CACHE_PERMANENT, CACHE_TEMPORARY, or a Unix timestamp. If a Unix timestamp is given, the data will be treated as if it were marked CACHE_TEMPORARY after the current time exceeds the Unix timestamp.

public Point(int xPos, int yPos) { X = xPos; Y = yPos; } public Point() { } // Override Object.ToString(). public override string ToString() { return string.Format("X = {0}; Y = {1}", X, Y); } // Return a copy of the current object. public object Clone() { return new Point(this.X, this.Y); } } In this way, you can create exact stand-alone copies of the Point type, as illustrated by the following code: static void Main(string[] args) { Console.WriteLine("***** Fun with Object Cloning *****\n"); // Notice Clone() returns a plain object type. // You must perform an explicit cast to obtain the derived type. Point p3 = new Point(100, 100);

Point p4 = (Point)p3.Clone(); // Change p4.X (which will not change p3.X). p4.X = 0; // Print each object. Console.WriteLine(p3); Console.WriteLine(p4); Console.ReadLine(); } While the current implementation of Point fits the bill, you can streamline things just a bit. Because the Point type does not contain any internal reference type variables, you could simplify the implementation of the Clone() method as follows: public object Clone() { // Copy each field of the Point member by member. return this.MemberwiseClone(); } Be aware, however, that if the Point did contain any reference type member variables, MemberwiseClone() will copy the references to those objects (i.e., a shallow copy). If you wish to support a true deep copy, you will need to create a new instance of any reference type variables during the cloning process. Let s see an example.

A common iteration pattern for cache_set() can be seen in modules/filter/filter.module: // Store in cache with a minimum expiration time of 1 day. if ($cache) { cache_set($cid, $text, 'cache_filter', REQUEST_TIME + (60 * 60 * 24)); }