Re: Handling Unix signals in a GTK+ application
Add a unix signal number in the signal handler, and suck it out again in a custom event source's prepare method. The prepare method can return -1 for its timeout contribution, and true/false if there's something in the queue. So... poll *will* exit because of the signal... but will it check its event sources and everything... if no file descriptor is ready and timeout isnt reached ? you'll have to test it out with an idle main loop... because for the same reasons... you cant call g_main_context_wakeup(). I'll have to check the Glib source when I get back in about three weeks time... If I remember (the discussion will probably be well and truely over by then... heh). It SHOULD do the checks, as long as the main loop does a full cycle when it gets an EAGAIN from poll(), and doesn't just skip right back into the poll() call (which I personally think would be a very bad design idea). Returning -1 as the timeout basically tells the main loop to wait indefinately in the poll() call (unless a different event source, such as a timeout or idle, tells it to finish sooner). The source prepare methods, as I understand from the documentation, are the part that really drives the whole thing. They prepare the list of file descriptors that are passed to poll(), and it's the prepare methods that set up the timeout value that will be given to poll(). The event sources that indicated that there was an event waiting are then given a chance to dispatch those events after the poll() call. So it's sort of like an idler in that it'll get called every time through the loop (in fact, it should get called EVERY time though the loop, unlike an idler), but it's different from an idler in that it won't cause the poll() call to exit prematurely, and hence you won't get a busy wait happening. Fredderic ___ Join Excite! - http://www.excite.com The most personalized portal on the Web! ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
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-- -- Yueyu Lin ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Widgets inside a GtkDrawingArea
Sander Marechal wrote: Hello, I am writing a hearts game for GNOME using glade and the libglade XML loader. The main playing area is a big GtkDrawingArea. I need to add a button in the middle of the drawing area during the beginning of the game (when you are passing cards to another player). This button needs to disappear during the main play. Is there a way to add a button inside (or on top) a GtkDrawingArea using glade? Or using Gtk directly in C? Glade wouldn't let me add one. If it isn't possible, is there an easy way I can fake the effect of a button sitting in the middle of the drawing area? This is my first Gtk application (heck it's my first app since I moved away from the Win32 platform) so I'm not terribly experienced yet. Hi, You can't add a children widget to drawing area (it's not so easy, at least). Take a look at GtkLayout instead of GtkDrawingArea. This widget provides a window GtkLayout::bin_window that can be used for custom drawing like GtkDrawingArea and also it is a container like GtkFixed. http://developer.gnome.org/doc/API/2.0/gtk/GtkLayout.html Olexiy ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Find Signal Name, in callback handler.
Muthiah Annamalai wrote:
Dear friend,
I want to know if its possible to find Signal Name, in
callback handler.
Im writing language bindings and I need to evaluate
some designs on routing callbacks; with a fair
amount of searching on archives of this ML,
I dont find this question answered well, enough.
Q: void handler(GObject *obj,gpointer *ptr)
{
//how do I know which signal
// eg: changed, clicked, or whatever
// triggered this handler?
}
I can see some of the folks trying to show me the
thing called closures, but I dont want to tackle
1) Use g_signal_handler_find() to find the signal's id.
2) Use g_signal_name() to get the signal's name.
http://developer.gnome.org/doc/API/2.0/gobject/gobject-Signals.html#g-signal-handler-find
http://developer.gnome.org/doc/API/2.0/gobject/gobject-Signals.html#g-signal-name
Olexiy
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Re: Widgets inside a GtkDrawingArea
Olexiy Avramchenko wrote: Sander Marechal wrote: Is there a way to add a button inside (or on top) a GtkDrawingArea using glade? Or using Gtk directly in C? Glade wouldn't let me add one. If it isn't possible, is there an easy way I can fake the effect of a button sitting in the middle of the drawing area? Hi, You can't add a children widget to drawing area (it's not so easy, at least). Take a look at GtkLayout instead of GtkDrawingArea. This widget provides a window GtkLayout::bin_window that can be used for custom drawing like GtkDrawingArea and also it is a container like GtkFixed. http://developer.gnome.org/doc/API/2.0/gtk/GtkLayout.html Thank you, I got it partially how I want it. The button is sitting neatly on top of the playing area now, but it has a small grey box around it. See the screenshot at [1]. I think that the 1 pixel grey border is added by an invisible container widget that holds the button in question somehow. I have set all the border values on the button to 0 already, so I think it's not the button itself. Is it possible to remove that container, or set it's grey background to transparent so that the rounded button shape is drawn directly on the green canvas? A GIMPed mockup of the desired result is at [2]. It's no problem if it can't be done in Glade directly. I can simply load the glade XML file in C and execute a couple additional GTK commands on the button or it's container. Thanks again! [1] http://www.jejik.com/sander/hearts.png [2] http://www.jejik.com/sander/hearts2.png -- Sander Marechal ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Widgets inside a GtkDrawingArea
Olexiy Avramchenko wrote: Take a look at GtkLayout instead of GtkDrawingArea. This widget provides a window GtkLayout::bin_window that can be used for custom drawing like GtkDrawingArea and also it is a container like GtkFixed. I'm also having trouble getting the GtkLayout resized properly if the main window changes size. It looks like GtkLayout and it's container element GtkScrolledWindow do not send out configure_event's when the main GtkWindow is resized. Is this true? I have tried attaching a configure_event to the window itself and calling getting the size of the GtkScrolledWindow in the code, but that doesn't work. The resizing of the GtkLayout starts to lag a couple of frames behind the actual resize so it ends up at an incorrect size. Setting the configure_event to shoot after the class function improved it a little, but it still lags. Any solutions to this? Thanks! -- Sander Marechal ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
