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

[Colin McPhail]

Hi,

I can confirm that when I run your example program I too see the mouse pointer alternate between an arrow and an I-beam, so it's not just your setup. I'm running on macOS 10.14.4 with:
    Python: 3.7.3
    Sip: 4.19.17
    Qt: 5.12.3
    PyQt: 5.12.2

Regards,
Colin McPhail

On 15 May 2019, at 07:41, David Morris <othalan at othalan.net<mailto:othalan at othalan.net>> wrote:

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<mailto: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<mailto: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.
>>
>
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