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GdkColor is a structure that stores red, green, and blue values for a color as shown in the following code snippet. The pixel object automatically stores the index of the color when it is allocated in a color map, so there is usually no need for you to alter this value. struct GdkColor { guint32 pixel; guint16 red; guint16 green; guint16 blue; }; After creating a new GdkColor object, if you already know the red, green, and blue values of the color, you can specify them in the following manner. Red, green, and blue values are stored as unsigned integer values ranging from 0 to 65,535, where 65,535 indicates full color intensity. For example, the following color refers to white: color.red = 65535; color.green = 65535; color.blue = 65535; In most cases, you will be more familiar with the six-digit hexadecimal value for the color, such as #FFFFFF that refers to the color white. Therefore, GDK provides gdk_color_parse(), which parses the hexadecimal color into the correct RGB values. This function was used in Listing 4-9. gboolean gdk_color_parse (const gchar *color_string, GdkColor *color);

routes.MapRoute("catch-all", "{*catchall}", new {controller = "Error", action = "NotFound"});

After setting your initial color, you can choose the title that will be given to the color selection dialog with gtk_color_button_set_title(). By default, the title is Pick a Color , so it is not necessary to set this value if you are content with this title. void gtk_color_button_set_title (GtkColorButton *button, const gchar *title); The color selection dialog, covered in the next chapter in more detail, is shown when the user clicks the button. It allows the user to change the selected color. You can view the color selection dialog in Figure 4-9. When the color value is changed, the color-set signal is emitted for the widget. In Listing 4-5, the signal is caught and the foreground color of a GtkLabel changed with gtk_widget_modify_fg() as follows: gtk_color_button_get_color (button, &color); gtk_widget_modify_fg (label, GTK_STATE_NORMAL, &color);

The value catchall gives a name to the information that the catchall route picked up. You can retrieve this value by providing an action parameter with the same name.

Asymmetric encryption, in which Alice and Bob use different keys, is covered in the next chapter..

In Listing 4-9, the foreground color was set in the normal widget state, which is what state all labels will be in, by and large, unless they are selectable. There are five options for the GtkStateType enumeration that can be used in gtk_widget_modify_fg(), which were presented in the Widget Styles section. You can reset the widget s foreground color to the default value by passing a NULL color.

The usual way of handling 404 errors in an ASP.NET application is to use the custom errors section of the Web.config file to define a custom 404 page. Although this approach can still be used in an ASP.NET MVC application, catchall routes can be used to provide greater control in cases where the incoming request doesn t match any of the registered routes.

The GtkFileChooserButton widget provides an easy method for you to ask users to choose a file or a folder. It implements the functionality of the GtkFileChooser interface, the file selection framework provided by GTK+. Figure 4-10 shows a file chooser button set to select a folder and a button set to select a file.

As we examine many of the algorithms, it is important to understand what each one does. It is also important to learn what the inputs and outputs are, and understand the trade-offs in using the different algorithms.

public class ErrorController : Controller { public ActionResult Notfound() { Response.StatusCode = 404; return View("404"); } }

Figure 4-10. File chooser buttons When the user clicks a GtkFileChooserButton, an instance of GtkFileChooserDialog is opened that allows the user to browse and select one file or one folder, depending on the type of button you created.