[PyQt] Mouse pointer changing shape (blinking) on signals and QLineEdit text cursor blink

[David Morris]

Any idea on how I can track down what signal / event / system interrupt /
whatever is causing this problem??

I tried creating a new user on my computer, fresh python install (3.6.2 for
something different), fresh pyqt5 install ... and same problem.

David

On Wed, May 15, 2019 at 1:40 AM Phil Thompson <phil at riverbankcomputing.com>
wrote:

> No, works fine for me.
>
> Phil
>
> On 14/05/2019 20:39, David Morris wrote:
> > Updates (but no fix):
> >
> > I updated my mac to MacOS 10.14.5 and the problem persists.
> > I tried some examples from PyQt5 and all exhibit the same behavior.
> >
> > However, Designer does NOT exhibit this behavior, and I understand it
> > is
> > written in Qt.  Is this a PyQt5 bug on MacOS?
> >
> > FYI, I installed PyQt5 using:  pip install pyqt5
> >
> > Can anyone on MacOS Mojave replicate this with my example code?
> >
> > David
> >
> > On Tue, May 14, 2019 at 4:22 PM David Morris <othalan at othalan.net>
> > wrote:
> >
> >> I am developing a small media player application using PyQt5 on MacOS
> >> Mojave. Any time the mouse is hovering over a widget where the mouse
> >> pointer changes shape, the mouse pointer begins to blink (flash?),
> >> changing
> >> shape between the normal mouse pointer and the alternate mouse
> >> pointer.
> >>
> >> For example, if I create a QLineEdit widget the mouse pointer changes
> >> to
> >> an I-Beam as the alternate pointer when hovering over the widget.
> >> Ordinarily this the mouse pointer simply changes shape so long as I am
> >> hovering over the widget. However, in the below test application the
> >> mouse
> >> pointer continually changes shape between the I-Beam pointer and the
> >> normal
> >> arrow mouse pointer, changing back and forth at the same rate as the
> >> input
> >> position cursor in the widget.
> >>
> >> Example code showing this behavior on my system:
> >>
> >> import sysfrom PyQt5               import QtWidgetsfrom PyQt5
> >>      import QtCore
> >>
> >> class MainWindow(QtWidgets.QMainWindow):
> >>     sig = QtCore.pyqtSignal()
> >>     def __init__(self):
> >>         super().__init__()
> >>         self.resize(400,400)
> >>         self.cw = QtWidgets.QWidget(self)
> >>         self.setCentralWidget(self.cw)
> >>         self.l = QtWidgets.QVBoxLayout(self.cw)
> >>         self.le = QtWidgets.QLineEdit(self.cw)
> >>         self.l.addWidget(self.le)
> >>         self.label = QtWidgets.QLabel()
> >>         self.l.addWidget(self.label)
> >>         self.show()
> >>
> >> app=QtWidgets.QApplication([sys.argv])
> >> w=MainWindow()
> >> app.setActiveWindow(w)
> >> exit_code = app.exec_()
> >>
> >> sys.exit(exit_code)
> >>
> >> In the above code I can fix the problem by disabling the line edit
> >> cursor
> >> flash using app.setCursorFlashTime(0). However, this does NOT fix the
> >> problem in my application. In my application, signals in other widgets
> >> will
> >> also cause the same mouse pointer shape changing (blinking) behavior.
> >>
> >> Version details:
> >> *MacOS* Mojave 10.14.1
> >> *PyQt5* 5.12.2
> >> *Python* 3.7.3
> >>
> >> I have developed QtApplications in the past and never observed this
> >> behavior and am at a loss as to why this is happening.
> >>
> >> It occurred to me this could be a MacOS bug, but I am unable to update
> >> my
> >> system at the moment (I am on a very poor internet connection and the
> >> update is huge).
> >>
> >> Does anyone have a solution for this highly irritating behavior?
> >>
> >> EDIT: Change "mouse cursor" to "mouse pointer" for clarity.
> >>
> >
> > _______________________________________________
> > PyQt mailing list    PyQt at riverbankcomputing.com
> > https://www.riverbankcomputing.com/mailman/listinfo/pyqt
>
>
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