Add a button to toggel reference mode to the toolbar

src/calibre/gui2/viewer/toolbars.py

@@ -50,6 +50,7 @@ def all_actions():
             'previous': Action('previous.png', _('Previous page'), 'previous'),
             'toc': Action('toc.png', _('Table of Contents'), 'toggle_toc'),
             'bookmarks': Action('bookmarks.png', _('Bookmarks'), 'toggle_bookmarks'),
+            'reference': Action('lookfeel.png', _('Toggle Reference mode'), 'toggle_reference_mode'),
             'lookup': Action('generic-library.png', _('Lookup words'), 'toggle_lookup'),
             'chrome': Action('tweaks.png', _('Show viewer controls'), 'show_chrome'),
             'mode': Action('scroll.png', _('Toggle paged mode'), 'toggle_paged_mode'),
@@ -62,7 +63,7 @@ def all_actions():
 
 DEFAULT_ACTIONS = (
         'back', 'forward', None, 'open', 'copy', 'increase_font_size', 'decrease_font_size', 'fullscreen',
-        None, 'previous', 'next', None, 'toc', 'bookmarks', 'lookup', 'chrome', None, 'mode', 'print', 'preferences',
+        None, 'previous', 'next', None, 'toc', 'bookmarks', 'lookup', 'reference', 'chrome', None, 'mode', 'print', 'preferences',
         'metadata'
 )
 
@@ -121,6 +122,7 @@ class ActionsToolBar(ToolBar):
         self.action_triggered.connect(web_view.trigger_shortcut)
         page = web_view.page()
         web_view.paged_mode_changed.connect(self.update_mode_action)
+        web_view.reference_mode_changed.connect(self.update_reference_mode_action)
         web_view.standalone_misc_settings_changed.connect(self.update_visibility)
         web_view.customize_toolbar.connect(self.customize, type=Qt.QueuedConnection)
 
@@ -147,6 +149,8 @@ class ActionsToolBar(ToolBar):
 
         self.toc_action = shortcut_action('toc')
         self.bookmarks_action = shortcut_action('bookmarks')
+        self.reference_action = a = shortcut_action('reference')
+        a.setCheckable(True)
         self.lookup_action = shortcut_action('lookup')
         self.chrome_action = shortcut_action('chrome')
 
@@ -180,6 +184,9 @@ class ActionsToolBar(ToolBar):
             a.setChecked(True)
             a.setToolTip(_('Switch to paged mode -- where the text is broken into pages'))
 
+    def update_reference_mode_action(self, enabled):
+        self.reference_action.setChecked(enabled)
+
     def set_tooltips(self, rmap):
         for sc, a in iteritems(self.shortcut_actions):
             if a.isCheckable():

src/calibre/gui2/viewer/web_view.py

@@ -252,6 +252,7 @@ class ViewerBridge(Bridge):
     copy_image = from_js(object)
     change_background_image = from_js(object)
     overlay_visibility_changed = from_js(object)
+    reference_mode_changed = from_js(object)
     show_loading_message = from_js(object)
     show_error = from_js(object, object, object)
     export_shortcut_map = from_js(object)
@@ -418,6 +419,7 @@ class WebView(RestartingWebEngineView):
     view_image = pyqtSignal(object)
     copy_image = pyqtSignal(object)
     overlay_visibility_changed = pyqtSignal(object)
+    reference_mode_changed = pyqtSignal(object)
     show_loading_message = pyqtSignal(object)
     show_error = pyqtSignal(object, object, object)
     print_book = pyqtSignal()
@@ -456,6 +458,7 @@ class WebView(RestartingWebEngineView):
         self.bridge.view_image.connect(self.view_image)
         self.bridge.copy_image.connect(self.copy_image)
         self.bridge.overlay_visibility_changed.connect(self.overlay_visibility_changed)
+        self.bridge.reference_mode_changed.connect(self.reference_mode_changed)
         self.bridge.show_loading_message.connect(self.show_loading_message)
         self.bridge.show_error.connect(self.show_error)
         self.bridge.print_book.connect(self.print_book)

src/pyj/read_book/view.pyj

@@ -976,7 +976,10 @@ class View:
 
     def toggle_reference_mode(self):
         self.reference_mode_enabled = not self.reference_mode_enabled
+        self.on_reference_item_changed()
         self.iframe_wrapper.send_message('set_reference_mode', enabled=self.reference_mode_enabled)
+        if ui_operations.reference_mode_changed:
+            ui_operations.reference_mode_changed(self.reference_mode_enabled)
 
     def on_reference_item_changed(self, data):
         data = data or {'refnum': None, 'index': None}

src/pyj/viewer-main.pyj

@@ -369,6 +369,8 @@ if window is window.top:
         to_python.quit()
     ui_operations.overlay_visibility_changed = def(visible):
         to_python.overlay_visibility_changed(visible)
+    ui_operations.reference_mode_changed = def(enabled):
+        to_python.reference_mode_changed(enabled)
     ui_operations.show_loading_message = def(msg):
         to_python.show_loading_message(msg)
     ui_operations.export_shortcut_map = def(smap):