Add Jump to bottom button

gajim/chat_control_base.py

@@ -175,8 +175,14 @@ def __init__(self, parent_win, widget_name, jid, acct,
         self._scrolled_view = ScrolledView()
         self._scrolled_view.add(self.conversation_view)
         self._scrolled_view.set_focus_vadjustment(Gtk.Adjustment())
-        self.xml.textview_box.add(self._scrolled_view)
-        self.xml.textview_box.reorder_child(self._scrolled_view, 2)
+
+        overlay = Gtk.Overlay()
+        overlay.add(self._scrolled_view)
+        overlay.add_overlay(self.xml.jump_to_end_button)
+        self.xml.textview_box.add(overlay)
+        self.xml.textview_box.reorder_child(overlay, 2)
+        self._scrolled_view.connect('autoscroll-changed',
+                                    self._on_autoscroll_changed)
         self._scrolled_view.connect('request-history',
                                     self.fetch_n_lines_history, 30)
 
@@ -929,6 +935,12 @@ def _on_message_textview_key_press_event(self, textview, event):
 
         return False
 
+    def _on_autoscroll_changed(self, _widget, autoscroll):
+        self.xml.jump_to_end_button.set_visible(not autoscroll)
+
+    def _on_jump_to_end(self, _button):
+        self.scroll_to_end(force=True)
+
     def _on_drag_data_received(self, widget, context, x, y, selection,
                                target_type, timestamp):
         """

gajim/gtk/conversation/scrolled.py

@@ -23,6 +23,11 @@ class ScrolledView(Gtk.ScrolledWindow):
             GObject.SignalFlags.RUN_LAST | GObject.SignalFlags.ACTION,
             None,
             ()
+        ),
+        'autoscroll-changed': (
+            GObject.SignalFlags.RUN_LAST,
+            None,
+            (bool,)
         )
     }
 
@@ -89,8 +94,10 @@ def _on_adj_value_changed(self, adj, *args):
         bottom = adj.get_upper() - adj.get_page_size()
         if (bottom - adj.get_value()) < 1:
             self._autoscroll = True
+            self.emit('autoscroll-changed', self._autoscroll)
         else:
             self._autoscroll = False
+            self.emit('autoscroll-changed', self._autoscroll)
 
         if self._complete:
             self._request_history_at_upper = None