Re:Help replacing GtkDrawingArea with GtkLayout
I have constructed the following minimal example, it creates a GtkLayout
with one label inside it, sets the GDK_STRUCTURE_MASK on the GdkWindow
of the GtkLayout and connects the configure-event signal to a routine
that would just exit the main loop. Instead of exiting, the window is
created without the configure-event signal firing. The GdkWindow and its
mask are printed out and appear to be set as per the documentation.
Please can someone explain what is wrong!
#include gtk/gtk.h
static gboolean
configure_event ()
{
fprintf (stderr, configure-event\n);
gtk_main_quit ();
return FALSE;
}
int main(int argc, char *argv[])
{
GtkWidget *window;
GtkWidget *layout;
GtkWidget *label1;
gtk_init (argc, argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
layout = gtk_layout_new (NULL, NULL);
gtk_container_add (GTK_CONTAINER (window), layout);
label1 = gtk_label_new (label 1);
gtk_layout_put (GTK_LAYOUT (layout), label1, 10, 50);
gtk_widget_show_all (window);
GdkWindow *win = gtk_widget_get_window(layout);
g_print(win is %p initial mask 0x%x\n, win, gdk_window_get_events (win));
gdk_window_set_events (win, gdk_window_get_events (win) |
GDK_STRUCTURE_MASK);
g_print(After adding GDK_STRUCTURE_MASK mask 0x%x\n,
gdk_window_get_events (win));
gtk_widget_add_events (layout, GDK_ALL_EVENTS_MASK);
g_signal_connect (layout, configure-event, G_CALLBACK (configure_event),
NULL);
gtk_main ();
return 0;
}
Richard Shann
From: Richard Shann rich...@rshann.plus.com
To: gtk-app-devel-list@gnome.org
Subject: Help replacing GtkDrawingArea with GtkLayout
Message-ID: 1393771664.4221.117.ca...@debianbox.loc
Content-Type: text/plain; charset=UTF-8
I want to replace the existing GtkDrawingArea with a GtkLayout in a
large application (GNU Denemo).
When I do this just by substituting gtk_drawing_area_new() with
gtk_layout_new(NULL, NULL) I do not receive the configure_event and
scroll_event signals, although the code gtk_widget_add_events ..
GDK_EXPOSURE_MASK is still in place.
I suspect this is to do with the cryptic note that drawing has to be
done to the bin_window instead of window, but beyond that I am stumped.
The draw event is being handled fine, and mouse button clicks etc are
all working.
Any help in migrating from GtkDrawingArea to GtkLayout would be much
appreciated.
Richard Shann
___
gtk-app-devel-list mailing list
gtk-app-devel-list@gnome.org
https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Re:Help replacing GtkDrawingArea with GtkLayout
On Mon, 2014-03-03 at 15:17 +, Richard Shann wrote: I have constructed the following minimal example, Yes indeed, https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-set-events This function must be called while a widget is unrealized. ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Re:Help replacing GtkDrawingArea with GtkLayout
On Mon, 2014-03-03 at 15:17 +, Richard Shann wrote: gtk_widget_show_all (window); GdkWindow *win = gtk_widget_get_window(layout); g_print(win is %p initial mask 0x%x\n, win, gdk_window_get_events (win)); gdk_window_set_events (win, gdk_window_get_events (win) | GDK_STRUCTURE_MASK); g_print(After adding GDK_STRUCTURE_MASK mask 0x%x\n, gdk_window_get_events (win)); gtk_widget_add_events (layout, GDK_ALL_EVENTS_MASK); Just a stupid guess, sorry: May it be necessary to set event mask BEFORE displaying the window with gtk_widget_show_all (window); ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Re:Help replacing GtkDrawingArea with GtkLayout
On Mon, 2014-03-03 at 16:49 +0100, Stefan Salewski wrote: On Mon, 2014-03-03 at 15:17 +, Richard Shann wrote: I have constructed the following minimal example, Yes indeed, https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-set-events This function must be called while a widget is unrealized. Thank you for giving this some thought. I think it is not the case however that the gtk_widget_show_all() call causes the widget to be realized in gtk-speak, it just sets a flag on the widget to say it should be visible (I am guessing). I think I have just made a breakthrough with my problem however - setting the configure-event signal handler on the parent GtkWindow widget instead of the GtkLayout window it contains causes it to fire off. I have tried this with the scroll-event too and that works. Why this should be different from the case where I use a GtkDrawingArea I have no idea, but it looks like I am cooking with gas! Thank you once more Richard ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Re:Help replacing GtkDrawingArea with GtkLayout
On Mon, Mar 3, 2014 at 5:26 PM, Richard Shann rich...@rshann.plus.com wrote: On Mon, 2014-03-03 at 16:49 +0100, Stefan Salewski wrote: On Mon, 2014-03-03 at 15:17 +, Richard Shann wrote: I have constructed the following minimal example, Yes indeed, https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-set-events This function must be called while a widget is unrealized. Thank you for giving this some thought. I think it is not the case however that the gtk_widget_show_all() call causes the widget to be realized in gtk-speak, it just sets a flag on the widget to say it should be visible (I am guessing). I think I have just made a breakthrough with my problem however - setting the configure-event signal handler on the parent GtkWindow widget instead of the GtkLayout window it contains causes it to fire off. I have tried this with the scroll-event too and that works. Why this should be different from the case where I use a GtkDrawingArea I have no idea, but it looks like I am cooking with gas! Either - I strongly recommend to stick to gdk_window_add_events (win, GDK_STRUCTURE_MASK); which does not have any dependency on widget/window realization. (I found myself in that very same pit some time ago). Best Bernhard ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Re:Help replacing GtkDrawingArea with GtkLayout
On Mon, 2014-03-03 at 16:38 +0001, Bernhard Schuster wrote: On Mon, Mar 3, 2014 at 5:26 PM, Richard Shann rich...@rshann.plus.com wrote: On Mon, 2014-03-03 at 16:49 +0100, Stefan Salewski wrote: On Mon, 2014-03-03 at 15:17 +, Richard Shann wrote: I have constructed the following minimal example, Yes indeed, https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-set-events This function must be called while a widget is unrealized. Thank you for giving this some thought. I think it is not the case however that the gtk_widget_show_all() call causes the widget to be realized in gtk-speak, it just sets a flag on the widget to say it should be visible (I am guessing). I think I have just made a breakthrough with my problem however - setting the configure-event signal handler on the parent GtkWindow widget instead of the GtkLayout window it contains causes it to fire off. I have tried this with the scroll-event too and that works. Why this should be different from the case where I use a GtkDrawingArea I have no idea, but it looks like I am cooking with gas! Either - I strongly recommend to stick to gdk_window_add_events (win, GDK_STRUCTURE_MASK); which does not have any dependency on widget/window realization. (I found myself in that very same pit some time ago). The docs indicate that this may be set anyway: The ::configure-event signal will be emitted when the size, position or stacking of the widget's window has changed. To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_STRUCTURE_MASK mask. GDK will enable this mask automatically for all new windows. Once I moved the signal handler attachment upwards in the widget hierarchy it sprang into life without any explicit setting of the GdkWindow mask. Richard ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
