From 60a1e27f154a516ce3de1045f0550a54de342cc7 Mon Sep 17 00:00:00 2001
From: Ed Page <eopage@byu.net>
Date: Wed, 12 Jan 2011 21:05:10 -0600
Subject: [PATCH] Reducing redraws when going through the rotations

---
 src/ejpi_qt.py        |    1 +
 src/util/qwrappers.py |   28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/src/ejpi_qt.py b/src/ejpi_qt.py
index 82cd74e..3210ec7 100755
--- 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
--- 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)
-- 
1.7.9.5