Re: detaching a notebook tab

[Jim Charlton <charltn gmail com>]

It works fine for me on gtk3.  I am running on linux and the version of 
gtk3 is the most recent in the repository, I believe (3.10.8-0ubuntu1.5).
Depends: libgtk-3-common (>= 3.10.8), libatk-bridge2.0-0 (>= 2.5.3), 
libatk1.0-0 (>= 2.7.5), libc6 (>= 2.14), libcairo-gobject2 (>= 1.10.0),
         libcairo2 (>= 1.13.0~20140204), libcolord1 (>= 0.1.10), 
libcups2 (>= 1.6.2), libfontconfig1 (>= 2.9.0), libgdk-pixbuf2.0-0 (>=
         2.27.1), libglib2.0-0 (>= 2.39.4), libpango-1.0-0 (>= 1.32.4), 
libpangocairo-1.0-0 (>= 1.32.4), libpangoft2-1.0-0 (>= 1.32.4),
         libwayland-client0 (>= 1.3.92), libwayland-cursor0 (>= 1.2.0), 
libx11-6 (>= 2:1.4.99.1), libxcomposite1 (>= 1:0.3-1), libxcursor1
         (> 1.1.2), libxdamage1 (>= 1:1.1), libxext6, libxfixes3, 
libxi6 (>= 2:1.2.99.4), libxinerama1, libxkbcommon0 (>= 0.2.0-0ubuntu3~),
         libxrandr2 (>= 2:1.2.99.3), shared-mime-info

I saw your other message ... but I just used the code from your first 
message and got the libs and cflags from `pkg-config gtk+-3.0 --libs` 
`pkg-config gtk+-3.0 --cflags`.

jim...


On 15-07-06 08:36 AM, Allin Cottrell wrote:
> Hello all,
>
> My app has a collection of objects which can be viewed either 
> individually or in a tabbed viewer based on GtkNotebook. When objects 
> are being viewed in the latter way, the user is supposed to be able to 
> drag an object out of the tabbed viewer, with the effect of giving it 
> its own window.
>
> This works fine with gtk 2.24.28, but I'm getting a segfault with the 
> same code on gtk 3.16.4. This looks like a gtk bug, but maybe I'm 
> doing something wrong and before I file a report I'd be grateful if 
> anyone could take a look at minimal test case below.
>
> The idea is to start the program, switch to the second page in the 
> notebook, and try dragging the tab onto the root window. With gtk3
> I get a crash, preceded by the message
>
> Gtk-CRITICAL **: gtk_widget_get_frame_clock: assertion 'GTK_IS_WIDGET 
> (widget)' failed
>
> Here's the minimal code:
>
> #include <gtk/gtk.h>
>
> /* Minimal test case for dragging a tab out of a
>    notebook onto the root window
>
>    Allin Cottrell <cottrell wfu edu>, 2015-07-06
> */
>
> static GtkNotebook *detach_tab_callback (GtkNotebook *book,
>                      GtkWidget *page,
>                      gint x, gint y,
>                      gpointer data)
> {
>     GtkWidget *window;
>     gint pgnum;
>
>     g_object_ref(page);
>     pgnum = gtk_notebook_page_num(GTK_NOTEBOOK(book), page);
>     gtk_notebook_remove_page(GTK_NOTEBOOK(book), pgnum);
>
>     window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
>     gtk_container_add(GTK_CONTAINER(window), page);
>     g_object_unref(page);
>
>     gtk_widget_show_all(window);
>
>     /* return NULL since we're not adding the detached
>        tab to another GtkNotebook */
>
>     return NULL;
> }
>
> int main (int argc, char **argv)
> {
>     GtkWidget *window, *notebook, *child;
>
>     gtk_init(&argc, &argv);
>
>     window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
>     g_signal_connect(G_OBJECT(window), "destroy",
>              gtk_main_quit, NULL);
>
>     notebook = gtk_notebook_new();
>     g_signal_connect(G_OBJECT(notebook), "create-window",
>              G_CALLBACK(detach_tab_callback), NULL);
>
>     child = gtk_label_new("Content of first page");
>     gtk_widget_set_size_request(child, -1, 100);
>     gtk_notebook_append_page(GTK_NOTEBOOK(notebook), child, NULL);
>
>     child = gtk_label_new("Content of second page");
>     gtk_widget_set_size_request(child, -1, 100);
>     gtk_notebook_append_page(GTK_NOTEBOOK(notebook), child, NULL);
>     gtk_notebook_set_tab_detachable(GTK_NOTEBOOK(notebook),
>                     child, TRUE);
>
>     gtk_container_add(GTK_CONTAINER(window), notebook);
>     gtk_widget_show_all(window);
>
>     gtk_main();
>
>     return 0;
> }