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

[Joseba Echevarria García]

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>
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>
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
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