Re: A couple of questions
- From: Vlad Harchev <hvv hippo ru>
- To: rhfreeman <rhfreeman micron com>
- Cc: "'gtk-list gnome org'" <gtk-list gnome org>
- Subject: Re: A couple of questions
- Date: Wed, 16 Aug 2000 17:31:07 +0500 (SAMST)
On Wed, 16 Aug 2000, rhfreeman wrote:
Hi,
> Hi folks,
>
> Just need to pick your brains about somethings!
>
> I've got this few lines of code scattered around in my code (in this
> order)....
>
> gtk_signal_emit_by_name(GTK_OBJECT(w_layout[current].drawing_area),
> "expose_event", GINT_TO_POINTER(current));
>
> static void expose_event(GtkWidget *widget, GdkEventExpose *event, gpointer
> current_ptr)
> {
> gint current=GPOINTER_TO_INT(current_ptr);
> gdk_draw_pixmap(widget->window,
> widget->style->fg_gc[GTK_WIDGET_STATE(widget)],
> w_layout[current].drawing_pixmap, 0, 0, 0, 0,
> w_layout[current].width, w_layout[current].height);
> }
>
> gtk_signal_connect(GTK_OBJECT(w_layout[current].drawing_area),
> "expose_event", GTK_SIGNAL_FUNC(expose_event), GINT_TO_POINTER(current));
>
> When the gtk_signal_emit_by_name() is called, I get this warning:
>
> Gtk-WARNING **: gtk_signal_collect_params(): invalid NULL pointer for return
> argument type `gboolean'
gtk_signal_emit_by_name accepts a variable list of arguments, the last one is
ptr to return value (you don't pass it). Also, GINT_TO_POINTER(current) you
pass to it will be used for GdkEventExpose *event, not for 'current_ptr'
(it's bound when you connect the signal!).
> Any ideas?
>
> On a second similar-ish front, if I've got this:
>
> gtk_signal_connect(GTK_OBJECT(w_layout[i].drawing_area),
> "button_press_event", (GtkSignalFunc) button_press_event,
> GINT_TO_POINTER(i));
>
> to detect mouse clicks. Is there anyway I can tell if the shift button was
> being held down at the same time as the click????
The .state member of GdkEventButton passed contains the currently pressed
modifiers (it means the same as in GdkEventKey).
> Ta folks!!
>
> Rich
>
Best regards,
-Vlad
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