Reducing redraws when going through the rotations

diff --git a/src/ejpi_qt.py b/src/ejpi_qt.py
index 82cd74e..3210ec7 100755 (executable)
--- a/src/ejpi_qt.py
+++ b/src/ejpi_qt.py
@@ -133,6 +133,7 @@ class MainWindow(qwrappers.WindowWrapper):
        def __init__(self, parent, app):
                qwrappers.WindowWrapper.__init__(self, parent, app)
                self._window.setWindowTitle("%s" % constants.__pretty_app_name__)
+               self._freezer = qwrappers.AutoFreezeWindowFeature(self._app, self._window)
 
                self._historyView = qhistory.QCalcHistory(self._app.errorLog)
                self._userEntry = QValueEntry()

diff --git a/src/util/qwrappers.py b/src/util/qwrappers.py
index 8577e63..df69f41 100644 (file)
--- a/src/util/qwrappers.py
+++ b/src/util/qwrappers.py
@@ -74,6 +74,10 @@ class ApplicationWrapper(object):
                raise NotImplementedError("Booh")
 
        @property
+       def qapp(self):
+               return self._qapp
+
+       @property
        def constants(self):
                return self._constants
 
@@ -233,3 +237,27 @@ class WindowWrapper(object):
        def _on_close_window(self, checked = True):
                with qui_utils.notify_error(self._errorLog):
                        self.close()
+
+
+class AutoFreezeWindowFeature(object):
+
+       def __init__(self, app, window):
+               self._app = app
+               self._window = window
+               self._app.qapp.focusChanged.connect(self._on_focus_changed)
+               if self._app.qapp.focusWidget() is not None:
+                       self._window.setUpdatesEnabled(True)
+               else:
+                       self._window.setUpdatesEnabled(False)
+
+       def close(self):
+               self._app.qapp.focusChanged.disconnect(self._on_focus_changed)
+               self._window.setUpdatesEnabled(True)
+
+       @misc_utils.log_exception(_moduleLogger)
+       def _on_focus_changed(self, oldWindow, newWindow):
+               with qui_utils.notify_error(self._app.errorLog):
+                       if oldWindow is None and newWindow is not None:
+                               self._window.setUpdatesEnabled(True)
+                       elif oldWindow is not None and newWindow is None:
+                               self._window.setUpdatesEnabled(False)