added maximize/restore to MDISubWindow, changed frame_on/frame_off from FramelessWindowHint to custom hint

grum/mdi/mdiarea.py

@@ -67,6 +67,7 @@ class MDIArea(QMdiArea):
         self.menu.checkboxes["Multiple windows"].setChecked(True)
         self.enable_subwindow_view()
         for sub in self.subWindowList():
+            sub.restore()
             sub.frame_on()
 
     def enable_single_window_mode(self):
@@ -75,7 +76,7 @@ class MDIArea(QMdiArea):
         self.closeInactiveSubWindows()
         active = self.activeSubWindow()
         if active:
-            active.showMaximized()
+            active.maximize()
             active.frame_off()
 
     def enable_tabbed_mode(self):
@@ -104,7 +105,7 @@ class MDIArea(QMdiArea):
     def add_single(self, sub):
         self.closeAllSubWindows()
         self.addSubWindow(sub)
-        sub.showMaximized()
+        sub.maximize()
         sub.frame_off()
 
 

grum/mdi/mdisubwin.py

@@ -14,12 +14,27 @@ class MDISubWindow(QMdiSubWindow):
         # without this, the SubWindow is not removed from the subWindowList
         self.setAttribute(Qt.WA_DeleteOnClose)
 
+        self._previous_state = None
+
+
+    def maximize(self):
+        self._previous_state = state = self.windowState()
+        self.setWindowState(state | Qt.WindowMaximized)
+
+    def restore(self):
+        if self._previous_state:
+            self.setWindowState(self._previous_state)
+
 
     def frame_on(self):
-        self.setWindowFlag(Qt.FramelessWindowHint, False)
+        self.hide()
+        self.setWindowFlags(Qt.SubWindow)
+        self.show()
 
     def frame_off(self):
-        self.setWindowFlag(Qt.FramelessWindowHint, True)
+        self.hide()
+        self.setWindowFlags(Qt.CustomizeWindowHint | Qt.WindowTitleHint)
+        self.show()