Move focused tab to forward / backward by shortcuts

mu/app.py

@@ -472,6 +472,8 @@ def load_theme(theme):
     editor_window.connect_find_again(find_again_handlers, "F3")
     editor_window.connect_toggle_comments(editor.toggle_comments, "Ctrl+K")
     editor_window.connect_close_tab(editor.close_tab, "Ctrl+W")
+    editor_window.connect_move_forward_tab(editor.move_forward_tab, "Ctrl+.")
+    editor_window.connect_move_backward_tab(editor.move_backward_tab, "Ctrl+,")
     editor.connect_to_status_bar(editor_window.status_bar)
 
     # Restore the previous session along with files passed by the os

mu/interface/main.py

@@ -499,6 +499,22 @@ def focus_tab(self, tab):
         self.tabs.setCurrentIndex(index)
         tab.setFocus()
 
+    def move_tab(self, tab, is_forward):
+        """
+        Move focused tab to forward / backward.
+        """
+        tab_cnt = len(self.tabs)
+        if tab_cnt:
+            index = self.tabs.indexOf(tab)
+            if is_forward:
+                index += 1
+                if index == tab_cnt: index = 0
+            else:
+                index -= 1
+                if index < 0: index = tab_cnt - 1
+            self.tabs.setCurrentIndex(index)
+            tab.setFocus()
+
     @property
     def tab_count(self):
         """
@@ -1366,11 +1382,27 @@ def connect_close_tab(self, handler, shortcut):
 
     def close_tab(self):
         """
-        Delete complete line on the cursor in the currently active tab.
+        Close the currently active tab.
         """
         if self.current_tab:
             self.tabs.removeTab(self.widgets.index(self.current_tab))
 
+    def connect_move_forward_tab(self, handler, shortcut):
+        """
+        Create a keyboard shortcut and associate it with a handler for moving 
+        a current active tab forward.
+        """
+        self.move_forward_tab_shortcut = QShortcut(QKeySequence(shortcut), self)
+        self.move_forward_tab_shortcut.activated.connect(handler)
+
+    def connect_move_backward_tab(self, handler, shortcut):
+        """
+        Create a keyboard shortcut and associate it with a handler for moving 
+        a current active tab backward.
+        """
+        self.move_backward_tab_shortcut = QShortcut(QKeySequence(shortcut), self)
+        self.move_backward_tab_shortcut.activated.connect(handler)
+
     def show_device_selector(self):
         """
         Reveals the device selector in the status bar

mu/logic.py

@@ -2011,6 +2011,18 @@ def close_tab(self):
         """
         self._view.close_tab()
 
+    def move_forward_tab(self):
+        """
+        Handle a shortcut for moving the current tab forward.
+        """
+        self._view.move_tab(self._view.current_tab, True)
+
+    def move_backward_tab(self):
+        """
+        Handle a shortcut for moving the current tab backward.
+        """
+        self._view.move_tab(self._view.current_tab, False)
+
     def tidy_code(self):
         """
         Prettify code with Black.