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interface the property presents to other consumers. When defining get and set explicitly, the set method must return void, and the get method must return the type of the property. The parameter list for get must be void, and the parameter list for set must be the type of the property. Properties need not map onto a field s value. For example, you could eliminate the atomicWeight field from the class and simply compute the value whenever get is called. The set method would then have to be eliminated. This is fine, though, since if only a get method is defined, the property can be retrieved but not set. As these methods get more complicated, you ll want to move them out of the class declaration. When defining property get and set methods out of the body of the class, use the class name and property name as qualifiers, as in Listing 7-3. Listing 7-3. Defining Property Accessors Outside of a Class value class ElementType { public: property double AtomicWeight { double get(); } }; double ElementType::AtomicWeight::get() { // same implementation as before } In fact, this notation is how the property accessor is referred to when you need to refer to the method name, such as when you assign a delegate to a get or set method; you use the name of the property in the qualified name, as shown in Listing 7-4. Listing 7-4. Using a Delegate with a Property Accessor // property_accessor_delegate.cpp using namespace System; delegate double ValueAccessor(); value class ElementType { public: property double AtomicWeight; };

The Client-Dispatcher-Server pattern is implemented using three architectural blocks. The first block is the base architecture, which is illustrated in Figure 4-9.

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TK+ is a system that relies on signals and callback functions. A signal is a notification to your application that the user has performed some action. When a signal is emitted, you can tell GTK+ to run a function named a callback function. To connect a signal, you can use g_signal_connect(). This function accepts four parameters. The first is the GObject you are watching for the signal. The signal_name is a string representing the signal; a list of signal names can be found in the tables throughout this appendix. gulong g_signal_connect (gpointer object, const gchar *signal_name, GCallback handler, gpointer data); The third parameter is the name of the callback function that will be called when the signal is emitted. The form for each callback function can be found in the GTK+ API documentation. However, many of the function prototypes have incomplete documentation, so you can find more information about nonstandard parameters in the signal reference tables throughout this appendix. The last parameter of g_signal_connect() allows you to send data of an arbitrary pointer type to the callback function. You can do this because gpointer is equivalent to C s void pointer type. You can also use g_signal_connect_swapped(), which works the same way as g_signal_ connect(), except the order of the object and data parameters is switched. This allows you to call a function on the data parameter pointer. This appendix provides a complete list of events and signals available to GTK+ objects and widgets. The first section provides information about the GDK event types available to GtkWidget and derivative classes. The sections that follow provide a complete list of signals names and a description for every object with signals in GTK+.

int main() { ElementType oxygen; oxygen.AtomicWeight = 15.9994; ValueAccessor^ get_method = gcnew ValueAccessor(oxygen, &ElementType::AtomicWeight::get); Console::WriteLine("{0}", get_method->Invoke()); } Say we d like to also have some static properties in our Element class. In fact, we d like to make a periodic table class with a static array property. There is nothing special about a static property; all the rules for static methods and fields apply. Static properties are intended to be used for properties of a type, not properties of a particular instance. Listing 7-5 is a first attempt at this. Listing 7-5. Trying to Define a Static Property // property_static.cpp value class ElementType { public: // Periodic Table of the Elements static property array<ElementType>^ PeriodicTable; static ElementType() { PeriodicTable = gcnew array<ElementType>(120); // Initialize each element and its properties. } }; That s great, but if we later want to change the implementation from an array to a List or Hashtable, we might need to rewrite the code that uses the property. A better way to implement collection-like properties is to use vector properties, also called indexed properties.

Events are a special type of signal that are emitted by the X Window System. Once emitted, they are sent from the window manager to your application to be interpreted by the signal system provided by GLib. In doing this, you can use the same signal connection and callback function methods as with normal signals. One difference is that event callback functions return a gboolean value.

Figure 4-9. UML architecture of the Client-Dispatcher-Server pattern The Client type uses the Dispatcher type, which has two methods: CanCreate and CreateInstance. The Dispatcher is a controller class that references a number of IResolver interface implementations. The purpose of the IResolver interface is to provide a mechanism whereby a type identifier can be converted into an object instance. The Dispatcher manages a collection of IResolver implementations, allowing servers to be registered and defined using multiple techniques. Both IResolver and Dispatcher use the type Identifier, which is a black box that makes type definition as flexible as possible.

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