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Only use asynchronous redraw methods when handling GUI events in Qt5Agg (fix #4604) by pwuertz · Pull Request #4612 · matplotlib/matplotlib · GitHub

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Only use asynchronous redraw methods when handling GUI events in Qt5Agg (fix #4604) #4612

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Merged
tacaswell merged 2 commits into from
Jul 22, 2015
Conversation 3 Commits 2 Checks 0 Files changed
Merged

Only use asynchronous redraw methods when handling GUI events in Qt5Agg (fix #4604) #4612

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0870c50
Deferred rendering for gui events in Qt5Agg (fixes #4604)
pwuertz Jul 8, 2015
7fb21c6
Revert to using update() instead of redraw() for Qt5/Win
pwuertz Jul 10, 2015
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16 changes: 0 additions & 16 deletions lib/matplotlib/backends/backend_qt4agg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -73,22 +73,6 @@ def __init__(self, figure):
self._drawRect = None
self.blitbox = None
self.setAttribute(QtCore.Qt.WA_OpaquePaintEvent)
# it has been reported that Qt is semi-broken in a windows
# environment. If `self.draw()` uses `update` to trigger a
# system-level window repaint (as is explicitly advised in the
# Qt documentation) the figure responds very slowly to mouse
# input. The work around is to directly use `repaint`
# (against the advice of the Qt documentation). The
# difference between `update` and repaint is that `update`
# schedules a `repaint` for the next time the system is idle,
# where as `repaint` repaints the window immediately. The
# risk is if `self.draw` gets called with in another `repaint`
# method there will be an infinite recursion. Thus, we only
# expose windows users to this risk.
if sys.platform.startswith('win'):
self._priv_update = self.repaint
else:
self._priv_update = self.update


FigureCanvas = FigureCanvasQTAgg
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17 changes: 3 additions & 14 deletions lib/matplotlib/backends/backend_qt5.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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):
Expand Down Expand Up @@ -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.update()


class MainWindow(QtWidgets.QMainWindow):
Expand Down Expand Up @@ -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)
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21 changes: 3 additions & 18 deletions lib/matplotlib/backends/backend_qt5agg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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:
Expand Down Expand Up @@ -146,7 +147,7 @@ def draw(self):
# causes problems with code that uses the result of the
# draw() to update plot elements.
FigureCanvasAgg.draw(self)
self._priv_update()
self.update()

def blit(self, bbox=None):
"""
Expand Down Expand Up @@ -183,22 +184,6 @@ def __init__(self, figure):
self._drawRect = None
self.blitbox = None
self.setAttribute(QtCore.Qt.WA_OpaquePaintEvent)
# it has been reported that Qt is semi-broken in a windows
# environment. If `self.draw()` uses `update` to trigger a
# system-level window repaint (as is explicitly advised in the
# Qt documentation) the figure responds very slowly to mouse
# input. The work around is to directly use `repaint`
# (against the advice of the Qt documentation). The
# difference between `update` and repaint is that `update`
# schedules a `repaint` for the next time the system is idle,
# where as `repaint` repaints the window immediately. The
# risk is if `self.draw` gets called with in another `repaint`
# method there will be an infinite recursion. Thus, we only
# expose windows users to this risk.
if sys.platform.startswith('win'):
self._priv_update = self.repaint
else:
self._priv_update = self.update


FigureCanvas = FigureCanvasQTAgg
Expand Down
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