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Listing 9-2. Callback Functions for the Simple Pop-up Menu (popupmenus.c) static gboolean button_press_event (GtkWidget *eventbox, GdkEventButton *event, GtkWidget *menu) { if ((event->button == 3) && (event->type == GDK_BUTTON_PRESS)) { gtk_menu_popup (GTK_MENU (menu), NULL, NULL, NULL, NULL, event->button, event->time); return TRUE; } return FALSE; } static void pulse_activated (GtkMenuItem *item, GtkProgressBar *progress) { gtk_progress_bar_pulse (progress); gtk_progress_bar_set_text (progress, "Pulse!"); } static void fill_activated (GtkMenuItem *item, GtkProgressBar *progress) { gtk_progress_bar_set_fraction (progress, 1.0); gtk_progress_bar_set_text (progress, "One Hundred Percent"); } static void clear_activated (GtkMenuItem *item, GtkProgressBar *progress) { gtk_progress_bar_set_fraction (progress, 0.0); gtk_progress_bar_set_text (progress, "Reset to Zero"); }

Although we ve said that preexisting code should compile in mixed mode just by turning on the /clr option, there are many changes to the standard libraries that first appeared in Visual C++ 2005 that will cause compilation errors and warnings. For example, the C Runtime Library was updated to support more secure versions of many functions; depending on your warning level setting, the unsafe versions of these functions may generate compiler warnings. Also, numerous changes were made to better conform with the C++ and C standards. Refer to the What s New section in the Visual C++ documentation for details on these changes and how to disable the warnings, if necessary. Library changes aside, most code written for native C++ that works in Visual C++ 2003 will work when compiled with the /clr option in Visual C++ 2005 or Visual C++ 2008.

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In the button-press-event callback function in Listing 9-2, you can use gtk_menu_popup() to display the menu on the screen. void gtk_menu_popup (GtkMenu *menu, GtkWidget *parent_menu_shell, GtkWidget *parent_menu_item, GtkMenuPositionFunc func, gpointer func_data, guint button, guint32 event_time); In Listing 9-2, all parameters were set to NULL except for the mouse button that was clicked to cause the event (event->button) and the time when the event occurred (event->time). If the pop-up menu was activated by something other than a button, you should supply 0 to the button parameter.

The new code context is one of the most complex and demanding contexts. This should be the context where the least amount of time is spent, because when writing new code, there are no boundaries, no test scripts just brand new code and brand new tests. A good development strategy is to write new code that is then extended using the extension context. The idea is to define an infrastructure and overall architecture using the new code context. And then to finish the application, the team only needs to implement a series of extensions. Extensions are simpler to implement and test and lead to an overall development process that is controllable.

Note If the action was invoked by a popup-menu signal, the event time will not be available. In that case,

The CLR implements a layer that abstracts the processor architecture. Of course, it is true that the IL itself contained in managed assemblies is independent of any specific processor architecture. However, as you ve seen, code compiled with /clr rather than /clr:pure or /clr:safe may contain platform-specific code. Also, even in pure mode, you can invoke platform-specific functions. If you want to produce an application that is capable of running on any implementation of the CLI, you should use the /clr:safe option. If you know you ll be using the Microsoft Windows platform, but want the output code to be neutral with respect to CPU architecture, then you can use /clr:safe. There are x64 and Itanium versions of the CLR, and these versions of the CLR will run the same platform-neutral assemblies compiled with /clr:safe, natively on the x64 architecture. If the x64 CLR is not available (for example, if the 64-bit computer has only a 32-bit operating system installed), the code can be executed by the 32-bit CLR. If you want to produce an application specific to a particular architecture that still runs under the CLR, use the /clr option but use the particular compiler (or cross-compiler) for that architecture. Visual C++ 2005 and Visual C++ 2008 ship cross-compilers for x64 and Intel Itanium architectures, so you can generate code on an x86 computer that will execute natively on a 64-bit computer.

you can use gtk_get_current_event_time(). This function returns the timestamp of the current event or GDK_CURRENT_TIME if there are no recent events.

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