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What s stressful about this entire situation is that SecondMethod doesn t know whether the RunningTotal type instance is a value type or a reference type The method SecondMethod is making changes via method calls on the RunningTotal interface, assuming that the changes are kept Yet those changes aren t kept when the SecondMethod returns control, resulting in code that could potentially create buggy results The observant reader will say that my example is biased because the behavior for a value type passed as a parameter for a method has already been illustrated The same behavior could have been illustrated without a method call The same happens when a value type is downcast to an interface, as illustrated by the following example: ((RunningTotal)cls1)IncrementValue(); The class instance cls1 is downcast to RunningTotal, then the method IncrementValue is executed When the method cls1.

The following function requests the title bar and taskbar to display Hello World! as the title of the window Since gtk_window_set_title() requires a GtkWindow object as it s the first parameter, we must cast our window using the GTK_WINDOW() function void gtk_window_set_title (GtkWindow *window, const gchar *title); The second parameter of gtk_window_set_title() is the title that will be displayed by the window It uses GLib s implementation of char, which is called gchar When you see a parameter listed as gchar*, it will also accept const char*, because gchar* is defined as a typedef of the standard C string object The last function of interest in this section is gtk_widget_show(), which tells GTK+ to set the specified widget as visible The widget may not be immediately shown when you call gtk_widget_show(), because GTK+ queues the widget until all preprocessing is complete before it is drawn onto the screen.

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Like properties, there is a simple form and a more complex form of the declaration You saw the simple form in 2 As a reminder, the simple form of the declaration looks like this: event EventHandler^ anEvent; Like the more complex form of the property declaration, the more complex form of the event declaration lets you define your own methods for adding and removing event handlers, and raising events (see Listing 7-15) The arguments to add and remove must match the event s declared type Listing 7-15.

It is important to note that gtk_widget_show() will only show the widget it is called on If the widget has children that are not already set as visible, they will not be drawn on the screen Furthermore, if the widget s parent is not visible, it will not be drawn on the screen Instead, it will be queued until its parent is set as visible as well In addition to showing a widget, it is also possible to use gtk_widget_hide() to hide a widget from the user s view void gtk_widget_hide (GtkWidget *widget); This will hide all child widgets from view, but you should be careful This function only sets the specified widget as hidden If you show the widget at a later time, its children will be visible as well, since they were never marked as hidden.

GetValue is called, the results of the method IncrementValue will have disappeared A simple rule of thumb is not to subclass interfaces in a struct type unless you have a good reason..

Customizing Methods for an Event Handler event EventHandler^ Start { void add(EventHandler^ handler) { /* code to add an event handler to the invocation list */ } void remove(EventHandler^ handler) { /* code to remove an event handler from the invocation list */ } void raise(Object^ sender, EventArgs^ args) { /* code to fire the event */ } } Let s look at Listing 7-16 In this code, we create a managed class called Events that declares two events, Start and Exit The type EventHandler, defined in the NET Framework System namespace, is used There are many types derived from EventHandler that could also be used In fact, any delegate type could be used.

This will become an important distinction to make when you learn how to show and hide multiple widgets at once..

Now that you ve learned about the differences between inheritance and structs, it s time to move on to simple inheritance. The simplest kind of inheritance is when one type defines a method and a subclass redefines that method. Here s an example: class BaseClass { public void SimpleMethod() { DebugMgr.start( 10, "BaseClass.SimpleMethod"); DebugMgr.end( 10); } }

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