On Fri, 2003-10-17 at 17:20, David Bourguignon wrote: > Owen Taylor wrote: > > > > Not all widgets honor gtk_widget_set_extension_events(). If you look at > > the code for gtk_widget_realize(), you'll see how it is handled there. > > This default realize() handler is inherited by GtkDrawingArea, but most > > widgets aren't going to do anything with it. > > Indeed, it is more complicated than what I expected... :-) Registering extension > events seems impossible for most specialized widgets, such as buttons. However, > with the advent of the tablet as a de facto interface for many applications (in > tablet PCs for example), it could be interesting to consider extension events on > the same level as core pointer events, so that extension events would be enabled > by default for all widgets. Do you know if this kind of features are already > being considered for future gtk releases? No, I haven't really considered such a thing; the XInput extension has various quirks that would make me a bit nervous about always handling events through XInput. (Though making --with-xinput=xfree the default on Linux and similar *would* likely be a good idea.) Also, the problem of configuring the devices on a desktop-wide level would have to be solved. Note that handling *core* button-press-events on GtkButton also isn't supported. Basically, the standard GTK+ widgets have standard GTK+ event interpretations. Changing those event interpretations to make events from different devices do different things doesn't really fit in the GTK+ model. > Right now, if I understand correctly, I only have one option to know what device > pressed a button: derive a new class of button from the drawing area widget. Is > that correct? I don't think that would guarantee you any more future compatibility than the simpler hack of calling gdk_input_set_extension_events() on button->event_window in a ::realize signal handler. (There is no magic about derivation; if you are messing with the internal details of the widget, you are messing with the internal details of the widget, whether you are deriving or just connecting signal handlers.) I wouldn't guarantee absolutely that either will continue working forever, but they should be pretty safe for the next few years. Regards, Owen _______________________________________________ gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
