added tabbed mode

grum/mdi/mdiarea.py

@@ -10,6 +10,8 @@ class MDIArea(QMdiArea):
     def __init__(self, bar, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.logo = assets.logo()
+        self.setTabsClosable(True)
+        self.setTabsMovable(True)
         self._add_menu(bar)
 
 
@@ -17,17 +19,34 @@ class MDIArea(QMdiArea):
         menu = bar.addMenu("&Windows")
         menu.addAction("Cascade")
         menu.addAction("Tile")
+        menu.addAction("Tabbed")
         menu.addSeparator()
         menu.addAction("Close All")
         menu.triggered[QAction].connect(self.on_menu_select)
 
         self.actions = {
-            "Cascade":   self.cascadeSubWindows,
-            "Tile":      self.tileSubWindows,
+            "Cascade":   self.on_cascade,
+            "Tile":      self.on_tile,
+            "Tabbed":    self.enable_tabbed_view,
             "Close All": self.closeAllSubWindows
         }
 
 
+    def on_cascade(self):
+        self.enable_subwindow_view()
+        self.cascadeSubWindows()
+
+    def on_tile(self):
+        self.enable_subwindow_view()
+        self.tileSubWindows()
+
+    def enable_subwindow_view(self):
+        self.setViewMode(QMdiArea.SubWindowView)
+
+    def enable_tabbed_view(self):
+        self.setViewMode(QMdiArea.TabbedView)
+
+
     def on_menu_select(self, p):
         txt = p.text()
         self.actions[txt]()