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For most widgets, you will need to create your own pop-up menu. In this section, you are going to learn how to supply a pop-up menu to a GtkProgressBar widget. The pop-up menu we are going to implement is presented in Figure 9-1.

Another way to separate the two error levels is to define a default and custom configuration for each error level The default configuration would log all FATAL priorities, and a custom configuration would assign a priority to log all ERROR priorities There s nothing wrong with this approach, except that the default wouldn t be to log both priorities, and the administrator would need to inform the developer of his or her deployment solution What hasn t yet been covered, and would clarify the reasoning of the decision, is the ability of a destination to filter messages, making it possible to define a priority filter in two places Following is an example of an appender that can filter messages: <appender name="PanicAppender" type="log4netAppenderSmtpAppender"> <filter type="log4netFilterLevelRangeFilter"> <levelMin value="FATAL" /> <levelMax value="FATAL" /> </filter> <layout type="log4netLayout SimpleLayout " /> </appender>.

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Figure 9-1. A simple pop-up menu with three menu items The three pop-up menu items are used to pulse the progress bar, set it as 100 percent complete, and clear it. You will notice that, in Listing 9-1, an event box contains the progress bar. Because GtkProgressBar, like GtkLabel, is not able to detect GDK events by itself, we need to catch button-press-event signals using an event box. Listing 9-1. Simple Pop-up Menu (popupmenus.c) #include <gtk/gtk.h> static static static static static void create_popup_menu (GtkWidget*, GtkWidget*); void pulse_activated (GtkMenuItem*, GtkProgressBar*); void clear_activated (GtkMenuItem*, GtkProgressBar*); void fill_activated (GtkMenuItem*, GtkProgressBar*); gboolean button_press_event (GtkWidget*, GdkEventButton*, GtkWidget*);

#include <msclr\gcroot.h> using namespace msclr; class N { gcroot<R^> r; void f() { r = gcnew R(); r->F(); // Call method F on r. } };

replaced with a requirement. I didn t mention requirements because often requirements are like the complex idea Creating an invoice with a client and contain multiple requirements that are implied. Developers need to break those requirements into microrequirements.

int main (int argc, char *argv[]) { GtkWidget *window, *progress, *eventbox, *menu; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Pop-up Menus"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 250, -1);

/* Create all of the necessary widgets and initialize the pop-up menu. */ menu = gtk_menu_new (); eventbox = gtk_event_box_new (); progress = gtk_progress_bar_new (); gtk_progress_bar_set_text (GTK_PROGRESS_BAR (progress), "Nothing Yet Happened"); create_popup_menu (menu, progress); gtk_progress_bar_set_pulse_step (GTK_PROGRESS_BAR (progress), 0.05); gtk_event_box_set_above_child (GTK_EVENT_BOX (eventbox), FALSE); g_signal_connect (G_OBJECT (eventbox), "button_press_event", G_CALLBACK (button_press_event), menu); gtk_container_add (GTK_CONTAINER (eventbox), progress); gtk_container_add (GTK_CONTAINER (window), eventbox); gtk_widget_set_events (eventbox, GDK_BUTTON_PRESS_MASK); gtk_widget_realize (eventbox); gtk_widget_show_all (window); gtk_main (); return 0; } /* Create the pop-up menu and attach it to the progress bar. This will make sure * that the accelerators will work from application load. */ static void create_popup_menu (GtkWidget *menu, GtkWidget *progress) { GtkWidget *pulse, *fill, *clear, *separator; pulse = gtk_menu_item_new_with_label ("Pulse Progress"); fill = gtk_menu_item_new_with_label ("Set as Complete"); clear = gtk_menu_item_new_with_label ("Clear Progress"); separator = gtk_separator_menu_item_new (); g_signal_connect (G_OBJECT (pulse), "activate", G_CALLBACK (pulse_activated), progress); g_signal_connect (G_OBJECT (fill), "activate", G_CALLBACK (fill_activated), progress); g_signal_connect (G_OBJECT (clear), "activate", G_CALLBACK (clear_activated), progress);

#include <msclr\auto_gcroot.h> using namespace msclr; class N { auto_gcroot<R^> r; void f() { r = gcnew R(); r->F(); // Call method F on r. } }; // r's destructor is called when containing object is deleted.

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