Ensure iframe is focused after controls help is shown

src/pyj/read_book/globals.pyj

@@ -80,4 +80,5 @@ ui_operations = {
     'update_font_size': None,
     'goto_bookpos': None,
     'delete_book': None,
+    'focus_iframe': None,
 }

src/pyj/read_book/ui.pyj

@@ -67,6 +67,7 @@ class ReadUI:
         ui_operations.update_font_size = self.update_font_size.bind(self)
         ui_operations.goto_bookpos = self.goto_bookpos.bind(self)
         ui_operations.delete_book = self.delete_book.bind(self)
+        ui_operations.focus_iframe = self.focus_iframe.bind(self)
 
     def on_resize(self):
         self.view.on_resize()
@@ -162,6 +163,9 @@ class ReadUI:
     def delete_book(self, book, proceed):
         self.db.delete_book(book, proceed)
 
+    def focus_iframe(self):
+        self.view.focus_iframe()
+
     def update_color_scheme(self):
         self.view.update_color_scheme()
 

src/pyj/read_book/view.pyj

@@ -47,7 +47,8 @@ def show_controls_help():
     if not show_controls_help.listener_added:
         show_controls_help.listener_added = True
         container.addEventListener('click', def():
-                document.getElementById('controls-help-overlay').style.display = 'none'
+            document.getElementById('controls-help-overlay').style.display = 'none'
+            ui_operations.focus_iframe()
         )
     def msg(txt):
         return set_css(E.div(txt), padding='1ex 1em', text_align='center', margin='auto')

src/pyj/viewer-main.pyj

@@ -251,6 +251,8 @@ if window is window.top:
         view.update_color_scheme()
     ui_operations.update_font_size = def():
         view.update_font_size()
+    ui_operations.focus_iframe = def():
+        view.focus_iframe()
     ui_operations.goto_bookpos = def(cfi):
         return view.goto_bookpos(cfi)
     ui_operations.toggle_toc = def():
@@ -267,6 +269,7 @@ if window is window.top:
         to_python.report_cfi(request_id, data)
     ui_operations.ask_for_open = def(path):
         to_python.ask_for_open(path)
+
     document.body.appendChild(E.div(id='view'))
     window.onerror = onerror
     create_modal_container()