Deferred rendering for gui events in Qt5Agg (fixes #4604)

pwuertz · pwuertz · commit 0870c5028aca · 2015-07-16T08:16:49.000+02:00
diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
@@ -334,8 +334,7 @@ def resizeEvent(self, event):
         hinch = h / dpival
         self.figure.set_size_inches(winch, hinch)
         FigureCanvasBase.resize_event(self)
-        self.draw()
-        self.update()
+        self.draw_idle()
         QtWidgets.QWidget.resizeEvent(self, event)
 
     def sizeHint(self):
@@ -417,17 +416,7 @@ def stop_event_loop(self):
     stop_event_loop.__doc__ = FigureCanvasBase.stop_event_loop_default.__doc__
 
     def draw_idle(self):
-        'update drawing area only if idle'
-        d = self._idle
-        self._idle = False
-
-        def idle_draw(*args):
-            try:
-                self.draw()
-            finally:
-                self._idle = True
-        if d:
-            QtCore.QTimer.singleShot(0, idle_draw)
+        self._priv_update()
 
 
 class MainWindow(QtWidgets.QMainWindow):
@@ -666,7 +655,7 @@ def zoom(self, *args):
         self._update_buttons_checked()
 
     def dynamic_update(self):
-        self.canvas.draw()
+        self.canvas.draw_idle()
 
     def set_message(self, s):
         self.message.emit(s)
diff --git a/lib/matplotlib/backends/backend_qt5agg.py b/lib/matplotlib/backends/backend_qt5agg.py
@@ -63,14 +63,15 @@ class FigureCanvasQTAggBase(object):
 
     def drawRectangle(self, rect):
         self._drawRect = rect
-        self.repaint()
+        self.draw_idle()
 
     def paintEvent(self, e):
         """
         Copy the image from the Agg canvas to the qt.drawable.
         In Qt, all drawing should be done inside of here when a widget is
         shown onscreen.
         """
+        FigureCanvasAgg.draw(self)
 
         # FigureCanvasQT.paintEvent(self, e)
         if DEBUG:
