Description
Bug summary
This bug is similar to #11607. In my case, I get it when I combine PyQt5 and matplotlib 3.5.1. In any of the other combinations (PyQt5 and matplotlib==3.4.3 or PyQt6 and matplotlib==3.5.1) it works as expected.
Code for reproduction
# change this to use PyQt5 or PyQt6
qt = 'qt5'
import sys
import matplotlib
from matplotlib.figure import Figure
if qt == 'qt6':
from PyQt6.QtWidgets import *
from PyQt6.QtCore import *
from PyQt6.QtGui import *
if matplotlib.__version__ == '3.4.3':
raise ValueError('For PyQt6 Install matplotlib 3.5.1')
from matplotlib.backends.backend_qtagg import (FigureCanvas, NavigationToolbar2QT as NavigationToolbar)
else:
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from matplotlib.backends.backend_qt5agg import (FigureCanvasQTAgg as FigureCanvas,
NavigationToolbar2QT as NavigationToolbar)
import numpy as np
print('Matplotlib version:', matplotlib.__version__)
class ChartsBase(QMdiSubWindow):
def __init__(self):
super(ChartsBase, self).__init__()
self.setMinimumSize(400, 400)
self.mainwidgetmdi = QMainWindow() # must be QMainWindow to handle the toolbar
self.setWidget(self.mainwidgetmdi)
fig = Figure()
self.figure_canvas = FigureCanvas(fig)
self.fig = self.figure_canvas.figure
self.mainwidgetmdi.setCentralWidget(self.figure_canvas)
# similar to figure canvas
self.mpl_toolbar = NavigationToolbar(self.figure_canvas, self)
self.mpl_toolbar.setVisible(True)
if qt == 'qt6':
area = Qt.ToolBarArea.BottomToolBarArea
else:
area = Qt.BottomToolBarArea
self.mainwidgetmdi.addToolBar(area, self.mpl_toolbar)
t = np.linspace(0, 10, 501)
self.axes = self.fig.subplots(1, 1)
line_plot_ax = self.axes.plot(t)
class MDIWindow(QMainWindow):
count = 0
def __init__(self):
super().__init__()
self.mdi = QMdiArea()
self.setCentralWidget(self.mdi)
bar = self.menuBar()
file = bar.addMenu("File")
file.addAction("New")
file.triggered[QAction].connect(self.add_new)
self.setWindowTitle("MDI Application with matplotlib")
def add_new(self, p):
if p.text() == "New":
sub = ChartsBase()
sub.setWindowTitle("Matplotlib example")
self.mdi.addSubWindow(sub)
sub.show()
if __name__ == '__main__':
app = QApplication(sys.argv)
mdi = MDIWindow()
mdi.show()
sys.exit(app.exec())Actual outcome
To reproduce:
- execute the app
- Menu "File"
- "New"
- Maximize the subwindow
When the subwindow is maximized I get this error:
Traceback (most recent call last):
File "/home/mario/programs/miniconda/lib/python3.8/site-packages/matplotlib/backends/backend_qt.py", line 262, in enterEvent
x, y = self.mouseEventCoords(self._get_position(event))
AttributeError: 'QResizeEvent' object has no attribute 'pos'
Expected outcome
The maximized subwindow
Additional information
What are the conditions under which this bug happens? input parameters, edge cases, etc?
Using matplotlib==3.5.1 with PyQt5. Not happen with other combinations matplotlib==3.5.1 and PyQt6 or matplotlib==3.4.3 and PyQt5
Do you know why this bug is happening?
This bug is related to the QEvents methods. QResizeEvent does have not any method to get the position in PyQt5, unlike PyQt6 which does have it
Do you maybe even know a fix?
Add a try-except clausule to this method
matplotlib/lib/matplotlib/backends/backend_qt.py
Lines 264 to 266 in 60d0c33
def enterEvent(self, event):
try:
x, y = self.mouseEventCoords(self._get_position(event))
except AttributeError:
# QResizeEvent has no attribute pos
x = y = None
FigureCanvasBase.enter_notify_event(self, guiEvent=event, xy=(x, y))After this, work as expected!
Happy to open a PR if it is needed!
Operating system
Linux Mint 20.2
Matplotlib Version
3.5.1
Matplotlib Backend
QtAgg
Python version
Python 3.8.5
Jupyter version
No response
Installation
pip