How to auto-scroll a gtk.scrolledwindow?

After widening my search-radius, i found a ruby-related answer. since the problem is gtk-related, it should be able to be solved in any language like this:

you connect the widget which changes, in my case the treeview, with gtk.widget's 'size-allocate' signal and set the gtk.scrolledwindow value to "upper - page_size". example:

self.treeview.connect('size-allocate', self.treeview_changed)

...

def treeview_changed(self, widget, event, data=None):
    adj = self.scrolled_window.get_vadjustment()
    adj.set_value( adj.upper - adj.page_size )

link to the original post at ruby-forum.com:

hint hint

Python Gtk 3 version:

adj.set_value(adj.get_upper() - adj.get_page_size())

fookatchu's answer can be improved so that the callback could be used by multiple widgets:

def treeview_changed( self, widget, event, data=None ):
    adj = widget.get_vadjustment()
    adj.set_value( adj.upper - adj.pagesize )

The accepted answer has helped me figure out a Rust solution in gtk-rs to the auto-scroll to end of content issue.

Here's a Rust snippet that might help others:

// Imports used for reference
use gtk::{TextBuffer, TextView, TextBufferBuilder, ScrolledWindow, ScrolledWindowBuilder};

// The text buffer where the text is appended later
let text_buffer: TextBuffer = TextBufferBuilder::new().build();

// The containing text view that holds the text buffer
let text_view: TextView = TextView::new_with_buffer(&text_buffer);

// The scrolled window container with fixed height/width that holds the text view
let scrolled_window: ScrolledWindow = ScrolledWindowBuilder::new()
        .min_content_height(400)
        .min_content_width(600)
        .child(&text_view)
        .build();

// Have the text view connect to signal "size-allocate"
text_view.connect_size_allocate(clone!(@weak scrolled_window => move |_,_| {
   let adj = scrolled_window.get_vadjustment().unwrap();
   adj.set_value(adj.get_upper() - adj.get_page_size());
}));

// ...
// Later on, fill buffer with some text.
text_buffer.insert(&mut text_buffer.get_end_iter(), "This is my text I'm adding");