[PyQt] Cannot connect to the clicked signal of a QPieSeries

[Tony Arnold]

Joseba,

You beat me to it!

I still think your original problem is a bug which you might consider submitting. Not sure how though!

Regards,
Tony.

On Wed, 2018-03-21 at 16:17 +0100, Joseba Echevarria García wrote:
Good evening again,

Connecting the `clicked` event for each QPieSeries to a slot and getting the originating QPieSlice with self.sender() inside the slot seems to be working fine.

Thank you all for your suggestions!

Joseba

El 21 mar. 2018 16:05, "Joseba Echevarria García" <josebagar at gmail.com<mailto:josebagar at gmail.com>> escribió:
Good evening to all,

Thank you very much for your quick responses!
I have not been able to make your suggestion work, Tony. I believe I have adapted your suggestion but connecting the signal still raises TypeError (in fact, even doing `print(series.clicked)` raises the TypeError).

I have been able to make Maurizio's suggestion work, although I'd rather go with a more elegant solution if possible.

Looking at the development snapshot changelogs of sip<https://www.riverbankcomputing.com/static/Downloads/sip/ChangeLog-4.19.9.dev1803171438> & PyQt I've seen some changes regarding PieSlices; maybe it's just unsupported as of now.
I'm trying to get the pie slice object with QObject.sender(); If that does not work I'll probably go with Maurizio's solution.

The code modified as per Tony's suggestion is shown below:
import sys
from PyQt5.QtCore import pyqtSlot, QObject

from PyQt5 import QtWidgets, QtChart, QtGui

@pyqtSlot(QtChart.QPieSlice)
def series_clicked(clicked_slice):
    print('Slice clicked!')
    print(clicked_slice.pieSize)


# Create the PyQt app and main window
app = QtWidgets.QApplication(sys.argv)
window = QtWidgets.QMainWindow()
# Create the QChart object and set a few options
chart = QtChart.QChart()
chart.legend().hide()
chart.setAnimationOptions(QtChart.QChart.SeriesAnimations)
chart.setTitle('My precious')
# Create the series with the plot data with some silly data in it.
series = QtChart.QPieSeries()
series.setObjectName('series')

series.setUseOpenGL(enable=True)
series.append('Gandalf', 3)
series.append('Frodo', 1)
# Show the labels in each of the slices
for i, pie_slice in enumerate(series.slices()):
    pie_slice.setLabelVisible()

# Connect the slice clicked signal to the slot
#     Traceback (most recent call last):
#       File "C:/Users/jechevarria/.PyCharm2017.3/config/scratches/scratch_5.py", line 32, in <module>
#         series.clicked.connect(series_clicked)
#     TypeError: C++ type 'QPieSlice*' is not supported as a signal argument type
series.clicked.connect(series_clicked)

# Add the series to the chart, create the view and add some more options
chart.addSeries(series)
view = QtChart.QChartView(chart)
view.setRenderHint(QtGui.QPainter.Antialiasing)

window.resize(640, 480)
window.setCentralWidget(view)
window.show()

# It's exec_ because exec is a reserved word in Python
sys.exit(app.exec_())

Regards,
Joseba

On Wed, Mar 21, 2018 at 3:05 PM, Tony Arnold <tony.arnold at manchester.ac.uk<mailto:tony.arnold at manchester.ac.uk>> wrote:
Joseba,

On Wed, 2018-03-21 at 12:45 +0100, Joseba Echevarria García wrote:

>
I'm trying to create a dynamic QChart plot based on QPieSeries. In
> this context I want to be able to detect which pie slice was
> clicked.and to do so I have set up a basic example (shown below).
>
> My problem is that I am unable to detect which slice was clicked;
> when connecting the `clicked` signal of a Series I get a TypeError
> exception stating:
> TypeError: C++ type 'QPieSlice*' is not supported as a signal
> argument type
>
> I'm guessing the feature is not yet implemented? I have
> unsuccessfully tried to connect each slice's `clicked` signal to the
> slot, but I'm always getting the latest value in the series (
> slice_clicked  always sees i=1 always in the example below).
>
> I'm getting the same exception when trying to connect the hovered
> signal. I have also tried passing the type name as a string by using
> the @pyqtSlot decorator, to no success.
>
> Is there anything I can do to be able to connect the `clicked` signal
> for the QPieSeries?
>
> I'm using Python 3.6.3 as bundled with Anaconda, Qt5.10.0, PyQt 5.10
> and PyQtChart 5.10 as downloaded from pip on Windows 7 64 bits.
>
> Sample code:
> import sys
> from PyQt5 import QtWidgets, QtChart, QtGui

I would add a PyQtSlot decorator for this signal and specify the
argument type, viz.,

from PyQt5.QtChart import QPieSlice

@pyqtSlot(QPieSlice)
def slice_clicked(slice):
    print('Slice clicked!')
    print(slice.pieSize)

Hope this helps.

Regards,
Tony.
--
Tony Arnold MBCS, CITP | Senior IT Security Analyst | Directorate of IT Services | G64, Kilburn Building | The University of Manchester | Manchester M13 9PL | T: +44 161 275 6093 | M: +44 773 330 0039



_______________________________________________
PyQt mailing list    PyQt at riverbankcomputing.com<mailto:PyQt at riverbankcomputing.com>
https://www.riverbankcomputing.com/mailman/listinfo/pyqt

--

Tony Arnold MBCS, CITP | Senior IT Security Analyst | Directorate of IT Services | G64, Kilburn Building | The University of Manchester | Manchester M13 9PL | T: +44 161 275 6093 | M: +44 773 330 0039
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.riverbankcomputing.com/pipermail/pyqt/attachments/20180321/c0fbe2b9/attachment.html>