From Cristian.Maureira-Fredes at qt.io  Tue Aug  9 19:04:26 2022
From: Cristian.Maureira-Fredes at qt.io (=?UTF-8?Q?Cristi=c3=a1n_Maureira-Fredes?=)
Date: Tue, 9 Aug 2022 19:04:26 +0200
Subject: [PySide] Packaging Qt for Python for *Linux
Message-ID: <8a94b149-b48d-fa49-d6b5-8d5a5c175fbc@qt.io>

Hey there,

In case you are currently maintaining shiboken/pyside
for a *Linux OS, you might want to check a couple of issues
that were recently reported by the person currently
in charge of packaging Shiboken and PySide for Debian (thanks Lisandro!)

We have interacted in the past with folks maintaining the packages
for Fedora and Arch, but maybe someone else is on this list.

These issues contain some discussion on them:

https://bugreports.qt.io/browse/PYSIDE-2001 (signature_p.h, fixed)
https://bugreports.qt.io/browse/PYSIDE-2002 (shiboken path)
https://bugreports.qt.io/browse/PYSIDE-2003 (get_path scheme change)
https://bugreports.qt.io/browse/PYSIDE-2005 (soon to be merged)
https://bugreports.qt.io/browse/PYSIDE-2009 (cmake dir name change)
https://bugreports.qt.io/browse/PYSIDE-2010 (arch qualified so)
https://bugreports.qt.io/browse/PYSIDE-2020 (installation path)

Even if you have no problem with the suggested solution
or build process change, please let us know as well with a comment.

The changes might break your current packaging workflow,
so your opinion is crucial.

Thanks for your time!


-- 
Dr. Cristi?n Maureira-Fredes
Senior R&D Manager

The Qt Company GmbH
Erich-Thilo-Str. 10
D-12489 Berlin

Gesch?ftsf?hrer: Mika P?lsi,
Juha Varelius, Jouni Lintunen
Sitz der Gesellschaft: Berlin,
Registergericht: Amtsgericht
Charlottenburg, HRB 144331 B

From frank at ohufx.com  Thu Aug 25 10:36:01 2022
From: frank at ohufx.com (Frank Rueter)
Date: Thu, 25 Aug 2022 20:36:01 +1200
Subject: [PySide] editing selected cells in QTabelWidget
Message-ID: <CAB3gnPXQZk83+6EoYTX_c1+SFy-Do0XQ+VP2RLGdPW0GtQYufA@mail.gmail.com>

Hi all,

I have a simple table which will never hold much data, so I opted for
QTabelWidget rather than QTabelView.
Two columns have combo boxes set as cell widgets; all other cells house
straight up strings.

I have set the selection behaviour to QAbstractItemView.SelectRows and am
now trying to figure out how to enable editing of selected cells, so that
the user can select multiple rows, then double click a cell in that
selection and edit it, which will cause all other cells in the same column
within the selection to receive the new value.

I have hit a couple of issues:

   1. By default the selection is reset when I double click in a cell, so I
   assume I will have to override QTableWidget.mousePressEvent() to prevent
   that somehow. Any suggestions on how to best manage that best? I am not
   sure what I need to re-implement to just prevent the selection being reset.
   2. the cell widgets do not modify the actual cell item's value. Do I
   need to manually connect the widgets to a slot that will do that or is
   there a better way to do that?

Is there an example for this sort of functionality out there? I am trying
not to use the lower level model/view classes in this case if possible.
Any help would be greatly appreciated.

Cheers,
frank
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From dc at dcsoft.com  Thu Aug 25 18:51:14 2022
From: dc at dcsoft.com (David Ching)
Date: Thu, 25 Aug 2022 09:51:14 -0700
Subject: [PySide] editing selected cells in QTabelWidget
In-Reply-To: <mailman.1.1661421601.111187.pyside@qt-project.org>
References: <mailman.1.1661421601.111187.pyside@qt-project.org>
Message-ID: <037001d8b8a2$e3bee1a0$ab3ca4e0$@dcsoft.com>

> Date: Thu, 25 Aug 2022 20:36:01 +1200
> From: Frank Rueter <frank at ohufx.com>
> Subject: [PySide] editing selected cells in QTabelWidget
> Hi all,
>
> I have a simple table which will never hold much data, so I opted for
QTabelWidget rather than QTabelView.
> Two columns have combo boxes set as cell widgets; all other cells house
straight up strings.
>
> I have set the selection behaviour to QAbstractItemView.SelectRows and am
now trying to figure out how to enable
>  editing of selected cells, so that the user can select multiple rows,
then double click a cell in that selection and edit it,
>  which will cause all other cells in the same column within the selection
to receive the new value.
>
> I have hit a couple of issues:
>
>  1. By default the selection is reset when I double click in a cell, so I
   assume I will have to override QTableWidget.mousePressEvent() to prevent
   that somehow. Any suggestions on how to best manage that best? I am not
   sure what I need to re-implement to just prevent the selection being
reset.

In general, double clicking on a multiple selection doesn't work since as
you note, the first click (of the double click) selects the single item that
was clicked and de-selects the other items.  To edit multiple selected items
(my app runs on Windows) I select them and then start editing by pressing F2
(which Excel uses similarly) or a toolbar button, or right-clicking one of
the selected items which opens a context menu with an Edit item.


>   2. the cell widgets do not modify the actual cell item's value. Do I
>    need to manually connect the widgets to a slot that will do that or is
>    there a better way to do that?

I had a similar task:

MyTableWidget::MyTableWidget(QWidget *parent) : QTableWidget(parent)
{
    m_delegate = new MyTableItemDelegate();  // MyTableItemDelegate is
derived from QStyledItemDelegate
    setItemDelegate(m_delegate);
}

MyTableItemDelegate overrides createEditor(), setEditorData(),
setModelData(), updateEditorGeometry().

Apologies, this code is in C++.  It has been years since I developed this
code, so don't know more details off the top of my head.

Hope this helps,
David




From frank at ohufx.com  Thu Aug 25 21:58:46 2022
From: frank at ohufx.com (Frank Rueter)
Date: Fri, 26 Aug 2022 07:58:46 +1200
Subject: [PySide] editing selected cells in QTabelWidget
In-Reply-To: <037001d8b8a2$e3bee1a0$ab3ca4e0$@dcsoft.com>
References: <mailman.1.1661421601.111187.pyside@qt-project.org>
 <037001d8b8a2$e3bee1a0$ab3ca4e0$@dcsoft.com>
Message-ID: <CAB3gnPXdmtxuRba1VUyMggXnV0=k8E66jv-r9LS7Zp-U-duAhA@mail.gmail.com>

Thanks David,
I was thinking about a right click option as a Plan B. Will do that.
I will look into using a delegate as well. I had forgotten I could use
those with the TableWidget as well.

Thanks!
Frank


On Fri, Aug 26, 2022 at 4:52 AM David Ching <dc at dcsoft.com> wrote:

> > Date: Thu, 25 Aug 2022 20:36:01 +1200
> > From: Frank Rueter <frank at ohufx.com>
> > Subject: [PySide] editing selected cells in QTabelWidget
> > Hi all,
> >
> > I have a simple table which will never hold much data, so I opted for
> QTabelWidget rather than QTabelView.
> > Two columns have combo boxes set as cell widgets; all other cells house
> straight up strings.
> >
> > I have set the selection behaviour to QAbstractItemView.SelectRows and am
> now trying to figure out how to enable
> >  editing of selected cells, so that the user can select multiple rows,
> then double click a cell in that selection and edit it,
> >  which will cause all other cells in the same column within the selection
> to receive the new value.
> >
> > I have hit a couple of issues:
> >
> >  1. By default the selection is reset when I double click in a cell, so I
>    assume I will have to override QTableWidget.mousePressEvent() to prevent
>    that somehow. Any suggestions on how to best manage that best? I am not
>    sure what I need to re-implement to just prevent the selection being
> reset.
>
> In general, double clicking on a multiple selection doesn't work since as
> you note, the first click (of the double click) selects the single item
> that
> was clicked and de-selects the other items.  To edit multiple selected
> items
> (my app runs on Windows) I select them and then start editing by pressing
> F2
> (which Excel uses similarly) or a toolbar button, or right-clicking one of
> the selected items which opens a context menu with an Edit item.
>
>
> >   2. the cell widgets do not modify the actual cell item's value. Do I
> >    need to manually connect the widgets to a slot that will do that or is
> >    there a better way to do that?
>
> I had a similar task:
>
> MyTableWidget::MyTableWidget(QWidget *parent) : QTableWidget(parent)
> {
>     m_delegate = new MyTableItemDelegate();  // MyTableItemDelegate is
> derived from QStyledItemDelegate
>     setItemDelegate(m_delegate);
> }
>
> MyTableItemDelegate overrides createEditor(), setEditorData(),
> setModelData(), updateEditorGeometry().
>
> Apologies, this code is in C++.  It has been years since I developed this
> code, so don't know more details off the top of my head.
>
> Hope this helps,
> David
>
>
>
> _______________________________________________
> PySide mailing list
> PySide at qt-project.org
> https://lists.qt-project.org/listinfo/pyside
>
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From frank at ohufx.com  Fri Aug 26 09:04:55 2022
From: frank at ohufx.com (Frank Rueter)
Date: Fri, 26 Aug 2022 19:04:55 +1200
Subject: [PySide] editing selected cells in QTabelWidget
In-Reply-To: <CAB3gnPXdmtxuRba1VUyMggXnV0=k8E66jv-r9LS7Zp-U-duAhA@mail.gmail.com>
References: <mailman.1.1661421601.111187.pyside@qt-project.org>
 <037001d8b8a2$e3bee1a0$ab3ca4e0$@dcsoft.com>
 <CAB3gnPXdmtxuRba1VUyMggXnV0=k8E66jv-r9LS7Zp-U-duAhA@mail.gmail.com>
Message-ID: <CAB3gnPXtLK0xZyo7Ogab21Zz-QRXWjZiGKCt5JjK4n2yXvm5Ng@mail.gmail.com>

So I made some progress but am now having the problem that a right click on
a persistent editor (combo box) will lose the current table selection. I
tried reimplementing the mousePressEvent on both the editor widget and the
actual table widget to stop that behaviour but to no avail.
Here is a simplified version of the code that shows the problem:
https://pastebin.com/M9RSTFSJ
[image: image.png]
What I am trying to achieve is that a right click on the editor ithe "Type"
column will keep the current row selection, so that I can then pop up the
editor and apply the new value to all selected rows.

What am I missing?

Cheers,
frank

On Fri, Aug 26, 2022 at 7:58 AM Frank Rueter <frank at ohufx.com> wrote:

> Thanks David,
> I was thinking about a right click option as a Plan B. Will do that.
> I will look into using a delegate as well. I had forgotten I could use
> those with the TableWidget as well.
>
> Thanks!
> Frank
>
>
> On Fri, Aug 26, 2022 at 4:52 AM David Ching <dc at dcsoft.com> wrote:
>
>> > Date: Thu, 25 Aug 2022 20:36:01 +1200
>> > From: Frank Rueter <frank at ohufx.com>
>> > Subject: [PySide] editing selected cells in QTabelWidget
>> > Hi all,
>> >
>> > I have a simple table which will never hold much data, so I opted for
>> QTabelWidget rather than QTabelView.
>> > Two columns have combo boxes set as cell widgets; all other cells house
>> straight up strings.
>> >
>> > I have set the selection behaviour to QAbstractItemView.SelectRows and
>> am
>> now trying to figure out how to enable
>> >  editing of selected cells, so that the user can select multiple rows,
>> then double click a cell in that selection and edit it,
>> >  which will cause all other cells in the same column within the
>> selection
>> to receive the new value.
>> >
>> > I have hit a couple of issues:
>> >
>> >  1. By default the selection is reset when I double click in a cell, so
>> I
>>    assume I will have to override QTableWidget.mousePressEvent() to
>> prevent
>>    that somehow. Any suggestions on how to best manage that best? I am not
>>    sure what I need to re-implement to just prevent the selection being
>> reset.
>>
>> In general, double clicking on a multiple selection doesn't work since as
>> you note, the first click (of the double click) selects the single item
>> that
>> was clicked and de-selects the other items.  To edit multiple selected
>> items
>> (my app runs on Windows) I select them and then start editing by pressing
>> F2
>> (which Excel uses similarly) or a toolbar button, or right-clicking one of
>> the selected items which opens a context menu with an Edit item.
>>
>>
>> >   2. the cell widgets do not modify the actual cell item's value. Do I
>> >    need to manually connect the widgets to a slot that will do that or
>> is
>> >    there a better way to do that?
>>
>> I had a similar task:
>>
>> MyTableWidget::MyTableWidget(QWidget *parent) : QTableWidget(parent)
>> {
>>     m_delegate = new MyTableItemDelegate();  // MyTableItemDelegate is
>> derived from QStyledItemDelegate
>>     setItemDelegate(m_delegate);
>> }
>>
>> MyTableItemDelegate overrides createEditor(), setEditorData(),
>> setModelData(), updateEditorGeometry().
>>
>> Apologies, this code is in C++.  It has been years since I developed this
>> code, so don't know more details off the top of my head.
>>
>> Hope this helps,
>> David
>>
>>
>>
>> _______________________________________________
>> PySide mailing list
>> PySide at qt-project.org
>> https://lists.qt-project.org/listinfo/pyside
>>
>
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From keith.kyzivat at qt.io  Fri Aug 26 16:38:48 2022
From: keith.kyzivat at qt.io (Keith Kyzivat)
Date: Fri, 26 Aug 2022 14:38:48 +0000
Subject: [PySide] editing selected cells in QTabelWidget
In-Reply-To: <CAB3gnPXtLK0xZyo7Ogab21Zz-QRXWjZiGKCt5JjK4n2yXvm5Ng@mail.gmail.com>
References: <mailman.1.1661421601.111187.pyside@qt-project.org>
 <037001d8b8a2$e3bee1a0$ab3ca4e0$@dcsoft.com>
 <CAB3gnPXdmtxuRba1VUyMggXnV0=k8E66jv-r9LS7Zp-U-duAhA@mail.gmail.com>
 <CAB3gnPXtLK0xZyo7Ogab21Zz-QRXWjZiGKCt5JjK4n2yXvm5Ng@mail.gmail.com>
Message-ID: <DBAPR02MB61977CFE3FF7BE9E8DF9739CE0759@DBAPR02MB6197.eurprd02.prod.outlook.com>

Hi Frank,

You should be able to suppress the single click deselect using an event filter.
You create (or use an existing) QObject that will receive all events that are sent to the QObject that you install the event filter on, and from that, you define an `eventFilter(obj: QObject, event: QEvent) -> bool` method on that which will do the event filtering.

From that method, you can look at the events type, looking for `QEvent.MouseButtonPress` or `QEvent.MouseButtonRelease` (not sure which is actually triggering the unselect), and just return `True` from the event filter in those cases. All other cases, you just return the parent?s implementation of eventFilter, passing the same object and event.

This way you achieve suppression of the mousePress and mouseRelease.

(I tried my best to translate these to Python, but these might not be 100% correct).

~Keith

From: PySide <pyside-bounces at qt-project.org> On Behalf Of Frank Rueter
Sent: Friday, August 26, 2022 3:05 AM
To: David Ching <dc at dcsoft.com>
Cc: pyside at qt-project.org
Subject: Re: [PySide] editing selected cells in QTabelWidget

So I made some progress but am now having the problem that a right click on a persistent editor (combo box) will lose the current table selection. I tried reimplementing the mousePressEvent on both the editor widget and the actual table widget to stop that behaviour but to no avail.
Here is a simplified version of the code that shows the problem:
https://pastebin.com/M9RSTFSJ
[cid:image001.png at 01D8B937.5E6EA900]
What I am trying to achieve is that a right click on the editor ithe "Type" column will keep the current row selection, so that I can then pop up the editor and apply the new value to all selected rows.

What am I missing?

Cheers,
frank

On Fri, Aug 26, 2022 at 7:58 AM Frank Rueter <frank at ohufx.com<mailto:frank at ohufx.com>> wrote:
Thanks David,
I was thinking about a right click option as a Plan B. Will do that.
I will look into using a delegate as well. I had forgotten I could use those with the TableWidget as well.

Thanks!
Frank


On Fri, Aug 26, 2022 at 4:52 AM David Ching <dc at dcsoft.com<mailto:dc at dcsoft.com>> wrote:
> Date: Thu, 25 Aug 2022 20:36:01 +1200
> From: Frank Rueter <frank at ohufx.com<mailto:frank at ohufx.com>>
> Subject: [PySide] editing selected cells in QTabelWidget
> Hi all,
>
> I have a simple table which will never hold much data, so I opted for
QTabelWidget rather than QTabelView.
> Two columns have combo boxes set as cell widgets; all other cells house
straight up strings.
>
> I have set the selection behaviour to QAbstractItemView.SelectRows and am
now trying to figure out how to enable
>  editing of selected cells, so that the user can select multiple rows,
then double click a cell in that selection and edit it,
>  which will cause all other cells in the same column within the selection
to receive the new value.
>
> I have hit a couple of issues:
>
>  1. By default the selection is reset when I double click in a cell, so I
   assume I will have to override QTableWidget.mousePressEvent() to prevent
   that somehow. Any suggestions on how to best manage that best? I am not
   sure what I need to re-implement to just prevent the selection being
reset.

In general, double clicking on a multiple selection doesn't work since as
you note, the first click (of the double click) selects the single item that
was clicked and de-selects the other items.  To edit multiple selected items
(my app runs on Windows) I select them and then start editing by pressing F2
(which Excel uses similarly) or a toolbar button, or right-clicking one of
the selected items which opens a context menu with an Edit item.


>   2. the cell widgets do not modify the actual cell item's value. Do I
>    need to manually connect the widgets to a slot that will do that or is
>    there a better way to do that?

I had a similar task:

MyTableWidget::MyTableWidget(QWidget *parent) : QTableWidget(parent)
{
    m_delegate = new MyTableItemDelegate();  // MyTableItemDelegate is
derived from QStyledItemDelegate
    setItemDelegate(m_delegate);
}

MyTableItemDelegate overrides createEditor(), setEditorData(),
setModelData(), updateEditorGeometry().

Apologies, this code is in C++.  It has been years since I developed this
code, so don't know more details off the top of my head.

Hope this helps,
David



_______________________________________________
PySide mailing list
PySide at qt-project.org<mailto:PySide at qt-project.org>
https://lists.qt-project.org/listinfo/pyside
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From frank at ohufx.com  Sat Aug 27 00:30:41 2022
From: frank at ohufx.com (Frank Rueter)
Date: Sat, 27 Aug 2022 10:30:41 +1200
Subject: [PySide] PySide2 on OSX 12.5.1 not working?
Message-ID: <CAB3gnPUzAWcxwtzR_71LkGK9QhtYtYhHnvj6J=OCzrxLiA2u2g@mail.gmail.com>

Hi all,

I just set up PySide2 on my laptop but when I run a simple test like the
below all I get is an empty window which freezes/beachballs straight away.
No messages in the Console app or my python interpreter so I have no idea
what is going on.

I installed pyside2 into a virtual env as usual:

   python3.7 -m venv venv_pyside2

followed by:

   source venv_pyside2/bin/activate


Then ran this test code:


from PySide2 import QtWidgets

import sys
args = sys.argv
app = QtWidgets.QApplication(args)
w = QtWidgets.QMessageBox()
w.setText("Test")
w.show()
sys.exit(app.exec_())



Any ideas why PySide2 will just beachball? I used to do a lot of PySide on
my laptop but that was on older OSX versions, so I suspect some insanely
paranoid security settings in the latest version.


Cheers,

frank
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From frank at ohufx.com  Tue Aug 30 00:08:07 2022
From: frank at ohufx.com (Frank Rueter)
Date: Tue, 30 Aug 2022 10:08:07 +1200
Subject: [PySide] signal connection only works with lambda
Message-ID: <CAB3gnPUBuDCUm7KJVPkQHzopoNcMR2rx9=ajM5P-mc9eFg3E1g@mail.gmail.com>

Hi all,

probably a pre-coffee hiccup:
I have this weird issue where my signal connection only works when
utilising lambda, even though the data type sent by the signal is exactly
what the receiving slot needs.
This is my code:

In a worker class (QRunnable) I emit this signal

*    tasks_data_available = QtCore.Signal(list)*

In my main widget I connect it like this:

*        worker.tasks_data_available.connect(self.__prep_task_data)*
the slot looks like this:

*    def __prep_task_data(self, task_list):*
*        print(task_list)*

I have done this countless times, but for some reason in this case the code
never calls the slot when the QRunnable emits task_list.

When I do this it works though:

*        worker.tasks_data_available.connect(lambda t:
self.__prep_task_data(t))*

What am I missing? I should not have to use lambda in this case.

Cheers,
frank
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From dc at dcsoft.com  Tue Aug 30 01:35:39 2022
From: dc at dcsoft.com (David Ching)
Date: Mon, 29 Aug 2022 16:35:39 -0700
Subject: [PySide] PySide2 on OSX 12.5.1 not working?
In-Reply-To: <mailman.1.1661594401.96474.pyside@qt-project.org>
References: <mailman.1.1661594401.96474.pyside@qt-project.org>
Message-ID: <07a701d8bc00$0c753760$255fa620$@dcsoft.com>

> Date: Sat, 27 Aug 2022 10:30:41 +1200
> From: Frank Rueter <frank at ohufx.com>
> Subject: [PySide] PySide2 on OSX 12.5.1 not working?
>
> Hi all,
>
> I just set up PySide2 on my laptop but when I run a simple test like the
below all I get is an empty window which freezes/beachballs straight away.
...
> from PySide2 import QtWidgets

Are you sure you want PySide2 and not PySide6?  I did a test on OSX 12.5.1
with Python 3.10 and it works with PySide6.

Thanks,
David




From frank at ohufx.com  Tue Aug 30 02:06:13 2022
From: frank at ohufx.com (Frank Rueter)
Date: Tue, 30 Aug 2022 12:06:13 +1200
Subject: [PySide] PySide2 on OSX 12.5.1 not working?
In-Reply-To: <07a701d8bc00$0c753760$255fa620$@dcsoft.com>
References: <mailman.1.1661594401.96474.pyside@qt-project.org>
 <07a701d8bc00$0c753760$255fa620$@dcsoft.com>
Message-ID: <CAB3gnPWwMhoqPb86snCY3v890k3DJMf9JDfMw4VwsPxHhXsKTg@mail.gmail.com>

I'd prefer PySide2 as our industry is using that as the standard
<https://vfxplatform.com/> for all DCC apps which is what I am mostly
developing things for.
Will try PySide6 though just to see if that is the issue.

Cheers,
frank


On Tue, Aug 30, 2022 at 11:36 AM David Ching <dc at dcsoft.com> wrote:

> > Date: Sat, 27 Aug 2022 10:30:41 +1200
> > From: Frank Rueter <frank at ohufx.com>
> > Subject: [PySide] PySide2 on OSX 12.5.1 not working?
> >
> > Hi all,
> >
> > I just set up PySide2 on my laptop but when I run a simple test like the
> below all I get is an empty window which freezes/beachballs straight away.
> ...
> > from PySide2 import QtWidgets
>
> Are you sure you want PySide2 and not PySide6?  I did a test on OSX 12.5.1
> with Python 3.10 and it works with PySide6.
>
> Thanks,
> David
>
>
>
>
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From frank at ohufx.com  Tue Aug 30 07:48:19 2022
From: frank at ohufx.com (Frank Rueter)
Date: Tue, 30 Aug 2022 17:48:19 +1200
Subject: [PySide] Can't override paintEvent on QTableWidget
Message-ID: <CAB3gnPUAoTgScK8DP3gE6TV0KCOa=L=LFtZXqCNe3_L+_yxYLg@mail.gmail.com>

Hi all,

I am trying to override the paintEvent in a QTableWidget to draw a custom
progressbar into the table area until the table data is loaded. I have done
this with other widgets in the past but the table widget won't let me do
this.
I am getting these errors:
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::setBrush: Painter not active

Here is a simple code snippet for testing:
https://gist.github.com/frueter/a5b722926a847c291d1472a6fd145dbf

When I inherit from QWidget it works fine.
Is this sort of thing not possible with a QTableWidget?

Cheers,
frank
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From Cristian.Maureira-Fredes at qt.io  Tue Aug 30 09:21:08 2022
From: Cristian.Maureira-Fredes at qt.io (=?UTF-8?Q?Cristi=c3=a1n_Maureira-Fredes?=)
Date: Tue, 30 Aug 2022 09:21:08 +0200
Subject: [PySide] signal connection only works with lambda
In-Reply-To: <CAB3gnPUBuDCUm7KJVPkQHzopoNcMR2rx9=ajM5P-mc9eFg3E1g@mail.gmail.com>
References: <CAB3gnPUBuDCUm7KJVPkQHzopoNcMR2rx9=ajM5P-mc9eFg3E1g@mail.gmail.com>
Message-ID: <41b018a3-93a9-f5de-8581-1c785969763f@qt.io>



On 8/30/22 00:08, Frank Rueter wrote:
> Hi all,
> 

Hey Frank,

> probably a pre-coffee hiccup:
> I have this weird issue where my signal connection only works when 
> utilising lambda, even though the data type sent by the signal is 
> exactly what the receiving slot needs.
> This is my code:
> 
> In a worker class (QRunnable) I emit this signal
> *? ? tasks_data_available = QtCore.Signal(list)
> *
> 

Just a sanity check:
That's declared inside a class, but not inside any method, right?

> In my main widget I connect it like this:
> *? ? ? ? worker.tasks_data_available.connect(self.__prep_task_data)
> *
> the slot looks like this:
> *? ? def __prep_task_data(self, task_list):
> *
> *? ? ? ? print(task_list)*

Is this method decorated with a `@Slot(list)` ?

@Slot(list)
def __prep_task_data(elf, task_list):
     ...

> I have done this countless times, but for some reason?in this case the 
> code never calls the slot when the QRunnable emits task_list.
> 
> When I do this it works though:
> *? ? ? ? worker.tasks_data_available.connect(lambda t: 
> self.__prep_task_data(t))
> *

This might be due to the lazy registration of the lambda as a Slot,
without properly going through the Slot-registration process.

> What am I missing? I should not have to use lambda in this case.

It might be the missing @Slot,
but let me know if that's not the case.

> Cheers,
> frank


Cheers

-- 
Dr. Cristi?n Maureira-Fredes
Senior R&D Manager

The Qt Company GmbH
Erich-Thilo-Str. 10
D-12489 Berlin

Gesch?ftsf?hrer: Mika P?lsi,
Juha Varelius, Jouni Lintunen
Sitz der Gesellschaft: Berlin,
Registergericht: Amtsgericht
Charlottenburg, HRB 144331 B

From Cristian.Maureira-Fredes at qt.io  Tue Aug 30 09:37:31 2022
From: Cristian.Maureira-Fredes at qt.io (=?UTF-8?Q?Cristi=c3=a1n_Maureira-Fredes?=)
Date: Tue, 30 Aug 2022 09:37:31 +0200
Subject: [PySide] Can't override paintEvent on QTableWidget
In-Reply-To: <CAB3gnPUAoTgScK8DP3gE6TV0KCOa=L=LFtZXqCNe3_L+_yxYLg@mail.gmail.com>
References: <CAB3gnPUAoTgScK8DP3gE6TV0KCOa=L=LFtZXqCNe3_L+_yxYLg@mail.gmail.com>
Message-ID: <a1a4bf62-1c22-6770-9f0e-fc974e461ac7@qt.io>



On 8/30/22 07:48, Frank Rueter wrote:
> Hi all,

Hey there,

> I am trying to override the paintEvent in a QTableWidget to draw a 
> custom progressbar into the table area until the table data is loaded. I 
> have done this with other widgets in the past but the table widget won't 
> let me do this.
> I am getting these errors:
> QWidget::paintEngine: Should no longer be called
> QPainter::begin: Paint device returned engine == 0, type: 1
> QPainter::setBrush: Painter not active
> 
> Here is a simple code snippet for testing:
> https://gist.github.com/frueter/a5b722926a847c291d1472a6fd145dbf 
> <https://gist.github.com/frueter/a5b722926a847c291d1472a6fd145dbf>
> 
> When I inherit from QWidget it works fine.
> Is this sort of thing not possible with a QTableWidget?

It's because QTableWidget is a subclass of QTableView (and that's one 
from QAbstractScrollArea),
and AFAIK you need to open the painter based on the base viewport.

https://doc.qt.io/qt-6/qabstractscrollarea.html#paintEvent

and there you can see the hint to use the viewport.

In your code,
just replace:

painter = QtGui.QPainter(self)
by
painter = QtGui.QPainter(self.viewport())

and it should work. At least locally, I can see the gradient.

> Cheers,
> frank
> 

Cheers

-- 
Dr. Cristi?n Maureira-Fredes
Senior R&D Manager

The Qt Company GmbH
Erich-Thilo-Str. 10
D-12489 Berlin

Gesch?ftsf?hrer: Mika P?lsi,
Juha Varelius, Jouni Lintunen
Sitz der Gesellschaft: Berlin,
Registergericht: Amtsgericht
Charlottenburg, HRB 144331 B

From dc at dcsoft.com  Tue Aug 30 17:53:50 2022
From: dc at dcsoft.com (David Ching)
Date: Tue, 30 Aug 2022 08:53:50 -0700
Subject: [PySide] editing selected cells in QTabelWidget
In-Reply-To: <mailman.27779.1661524736.88364.pyside@qt-project.org>
References: <mailman.27779.1661524736.88364.pyside@qt-project.org>
Message-ID: <086b01d8bc88$b34a6140$19df23c0$@dcsoft.com>

Even if you got the right click to actually set focus to the combo box on
one item, I am not sure the user would find that intuitive.  Right-clicking
usually brings up a context menu.  On deeper thought, it seems to be a
conflict of using the persistent editor with a selection of multiple items.
It's not standard.  I would instead propose:

Insert a first column of checkmark controls.  Selecting an item checks this
checkbox.  In the end, multiple selections will have checkmarks.  Then you
can single click a combo box as normal, change the selection, and have it
apply to all the items with checkmarks.  Would that work for you?

Thanks,
David


> From: PySide <pyside-bounces at qt-project.org> On Behalf Of Frank Rueter
> Sent: Friday, August 26, 2022 3:05 AM
> Subject: Re: [PySide] editing selected cells in QTabelWidget

> So I made some progress but am now having the problem that a right click
>  on a persistent editor (combo box) will lose the current table selection.

> [...]




From glk at uchicago.edu  Wed Aug 31 00:58:30 2022
From: glk at uchicago.edu (Gordon L. Kindlmann)
Date: Tue, 30 Aug 2022 17:58:30 -0500
Subject: [PySide] examples/explainers for event filters?
Message-ID: <469963B3-1F3A-4BAE-8DEB-24FE9A099A33@uchicago.edu>

Hello,

I'm looking for simple examples or explainers on how to do event filtering in PySide6.  A google search result for:
pyside6 event filter examples
has as first result:
https://doc.qt.io/qtforpython/overviews/eventsandfilters.html#event-filters

But I have the feeling that this content represents some incomplete translation of C++ code and its description (the code has opening braces "{" and the text refers to true/false instead of True/False), so I'm not sure how much to trust this material.

I may be in the minority of PySide users in not having used Qt before, with only glancing interactions with C++, as I look to PySide as a better way to make guis for Python code.  These documentation glitches make me think I'm missing some other resources that are more specifically about PySide6.  Any advice?

Thank you,
Gordon


From frank at ohufx.com  Wed Aug 31 09:09:53 2022
From: frank at ohufx.com (Frank Rueter)
Date: Wed, 31 Aug 2022 19:09:53 +1200
Subject: [PySide] editing selected cells in QTabelWidget
In-Reply-To: <086b01d8bc88$b34a6140$19df23c0$@dcsoft.com>
References: <mailman.27779.1661524736.88364.pyside@qt-project.org>
 <086b01d8bc88$b34a6140$19df23c0$@dcsoft.com>
Message-ID: <CAB3gnPUJVw=sGrusfvm_WQzD0N0fxRHUGkyrmoNaRrrvqfir9w@mail.gmail.com>

Thanks, I solved that part by not using the persistent editor at all as
that seemed to interrupt things.
Instead I just use the mousePressEvent on the table to make single clicks
edit the cells. Then I have the delegate's setModelData method deal with
bulk editing selected rows.
This seems to work really well and is quite transparent in the code so I am
happy for now.

Thanks for holding my hand!

frank

On Wed, Aug 31, 2022 at 3:54 AM David Ching <dc at dcsoft.com> wrote:

> Even if you got the right click to actually set focus to the combo box on
> one item, I am not sure the user would find that intuitive.  Right-clicking
> usually brings up a context menu.  On deeper thought, it seems to be a
> conflict of using the persistent editor with a selection of multiple items.
> It's not standard.  I would instead propose:
>
> Insert a first column of checkmark controls.  Selecting an item checks this
> checkbox.  In the end, multiple selections will have checkmarks.  Then you
> can single click a combo box as normal, change the selection, and have it
> apply to all the items with checkmarks.  Would that work for you?
>
> Thanks,
> David
>
>
> > From: PySide <pyside-bounces at qt-project.org> On Behalf Of Frank Rueter
> > Sent: Friday, August 26, 2022 3:05 AM
> > Subject: Re: [PySide] editing selected cells in QTabelWidget
>
> > So I made some progress but am now having the problem that a right click
> >  on a persistent editor (combo box) will lose the current table
> selection.
>
> > [...]
>
>
>
>
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From Cristian.Maureira-Fredes at qt.io  Wed Aug 31 09:36:18 2022
From: Cristian.Maureira-Fredes at qt.io (=?UTF-8?Q?Cristi=c3=a1n_Maureira-Fredes?=)
Date: Wed, 31 Aug 2022 09:36:18 +0200
Subject: [PySide] examples/explainers for event filters?
In-Reply-To: <469963B3-1F3A-4BAE-8DEB-24FE9A099A33@uchicago.edu>
References: <469963B3-1F3A-4BAE-8DEB-24FE9A099A33@uchicago.edu>
Message-ID: <3dc981cd-bc62-a7ba-e258-9c8ba213e5e2@qt.io>



On 8/31/22 00:58, Gordon L. Kindlmann wrote:
> Hello,

Hey!

> I'm looking for simple examples or explainers on how to do event filtering in PySide6.  A google search result for:
> pyside6 event filter examples
> has as first result:
> https://doc.qt.io/qtforpython/overviews/eventsandfilters.html#event-filters

You can check this example
that implements eventFilter
https://code.qt.io/cgit/pyside/pyside-setup.git/tree/examples/network/googlesuggest 
(see googlesuggest.py)

> 
> But I have the feeling that this content represents some incomplete translation of C++ code and its description (the code has opening braces "{" and the text refers to true/false instead of True/False), so I'm not sure how much to trust this material.

Yeah, indeed that's one of the wrongly translated snippets,
because the process is automated. Could you please open a bug report to 
fix it?

> I may be in the minority of PySide users in not having used Qt before, with only glancing interactions with C++, as I look to PySide as a better way to make guis for Python code.  These documentation glitches make me think I'm missing some other resources that are more specifically about PySide6.  Any advice?

You are not missing out other material,
personally, I always recommend people to check the 'examples'
for learning purposes.

The reason of having those mistranslated snippets
is because before, that was a manual process,
and due to the amount of snippets in Qt,
it was never even 20% done. So the team decided
to automatically translate the snippets,
which can provide more context, but with a price
of having some of them wrongly translated.
For that, we require feedback (like the one you gave!)
of which are the snippets that require a fix.

> Thank you,
> Gordon

Regarding that page,
you can find the C++ code as well:
https://doc.qt.io/qt-6/eventsandfilters.html

Once you file the bug report, we can do a manual
translation and provide the proper code snippets in
https://doc.qt.io/qtforpython/overviews/eventsandfilters.html#event-filters


Cheers!

-- 
Dr. Cristian Maureira-Fredes
Senior R&D Manager

The Qt Company GmbH
Erich-Thilo-Str. 10
D-12489 Berlin

Gesch?ftsf?hrer: Mika P?lsi,
Juha Varelius, Mika Harjuaho
Sitz der Gesellschaft: Berlin,
Registergericht: Amtsgericht
Charlottenburg, HRB 144331 B
--

From dc at dcsoft.com  Wed Aug 31 18:08:49 2022
From: dc at dcsoft.com (David Ching)
Date: Wed, 31 Aug 2022 09:08:49 -0700
Subject: [PySide] editing selected cells in QTabelWidget
In-Reply-To: <CAB3gnPUJVw=sGrusfvm_WQzD0N0fxRHUGkyrmoNaRrrvqfir9w@mail.gmail.com>
References: <mailman.27779.1661524736.88364.pyside@qt-project.org>
 <086b01d8bc88$b34a6140$19df23c0$@dcsoft.com>
 <CAB3gnPUJVw=sGrusfvm_WQzD0N0fxRHUGkyrmoNaRrrvqfir9w@mail.gmail.com>
Message-ID: <099801d8bd53$f58a0cb0$e09e2610$@dcsoft.com>

> From: Frank Rueter mailto:frank at ohufx.com 
> Thanks, I solved that part by not using the persistent editor at all as that seemed to interrupt things.
> Instead I just use the mousePressEvent on the table to make single clicks edit the cells. Then I have 
> the delegate's setModelData method deal with bulk editing selected rows.
> This seems to work really well and is quite transparent in the code so I am happy for now.
> 
> Thanks for holding my hand!

Great! I am glad to help, I wish continued traffic on the mailing list as I think the PySide community is really great, but you don?t get a sense of that. It seems most of the users are very niche so there is not some industry swell around any one thing about it.

Cheers,
David





From glk at uchicago.edu  Wed Aug 31 18:17:27 2022
From: glk at uchicago.edu (Gordon L. Kindlmann)
Date: Wed, 31 Aug 2022 11:17:27 -0500
Subject: [PySide] examples/explainers for event filters?
In-Reply-To: <3dc981cd-bc62-a7ba-e258-9c8ba213e5e2@qt.io>
References: <469963B3-1F3A-4BAE-8DEB-24FE9A099A33@uchicago.edu>
 <3dc981cd-bc62-a7ba-e258-9c8ba213e5e2@qt.io>
Message-ID: <76636588-8398-407F-908A-0DCB4E026E98@uchicago.edu>



> On Aug 31, 2022, at 2:36 AM, Cristi?n Maureira-Fredes <Cristian.Maureira-Fredes at qt.io> wrote:
> 
> You can check this example
> that implements eventFilter
> https://code.qt.io/cgit/pyside/pyside-setup.git/tree/examples/network/googlesuggest (see googlesuggest.py)

Thanks for that suggestion; that's more useful than the other example I ran across:
https://forum.qt.io/topic/133106/installeventfilter-not-working-on-pyside6
which puts the event filter at the application level, rather than for a single widget.

>> But I have the feeling that this content represents some incomplete translation of C++ code ...
> 
> Yeah, indeed that's one of the wrongly translated snippets,
> because the process is automated. Could you please open a bug report to fix it?

Sure, can you point out how to open such a bug report?
I didn't see any links on the documentation page in question.

Thanks,
Gordon


From Cristian.Maureira-Fredes at qt.io  Wed Aug 31 20:33:26 2022
From: Cristian.Maureira-Fredes at qt.io (=?UTF-8?Q?Cristi=c3=a1n_Maureira-Fredes?=)
Date: Wed, 31 Aug 2022 20:33:26 +0200
Subject: [PySide] examples/explainers for event filters?
In-Reply-To: <76636588-8398-407F-908A-0DCB4E026E98@uchicago.edu>
References: <469963B3-1F3A-4BAE-8DEB-24FE9A099A33@uchicago.edu>
 <3dc981cd-bc62-a7ba-e258-9c8ba213e5e2@qt.io>
 <76636588-8398-407F-908A-0DCB4E026E98@uchicago.edu>
Message-ID: <fb4f145f-d4df-30f1-4934-dc91f9502a8b@qt.io>



On 8/31/22 18:17, Gordon L. Kindlmann wrote:
> 
> 
>> On Aug 31, 2022, at 2:36 AM, Cristi?n Maureira-Fredes <Cristian.Maureira-Fredes at qt.io> wrote:
>>
>> You can check this example
>> that implements eventFilter
>> https://code.qt.io/cgit/pyside/pyside-setup.git/tree/examples/network/googlesuggest (see googlesuggest.py)
> 
> Thanks for that suggestion; that's more useful than the other example I ran across:
> https://forum.qt.io/topic/133106/installeventfilter-not-working-on-pyside6
> which puts the event filter at the application level, rather than for a single widget.
> 
>>> But I have the feeling that this content represents some incomplete translation of C++ code ...
>>
>> Yeah, indeed that's one of the wrongly translated snippets,
>> because the process is automated. Could you please open a bug report to fix it?
> 
> Sure, can you point out how to open such a bug report?
> I didn't see any links on the documentation page in question.

Usually we put the community-focused content on the Public Wiki,
and we leave the documentation for tutorials, examples, and API comments.

When you go to pyside.org you will reach the public wiki,
where you can get:
https://wiki.qt.io/Qt_for_Python/Reporting_Bugs



> 
> Thanks,
> Gordon

Cheers!

-- 
Dr. Cristi?n Maureira-Fredes
Senior R&D Manager

The Qt Company GmbH
Erich-Thilo-Str. 10
D-12489 Berlin

Gesch?ftsf?hrer: Mika P?lsi,
Juha Varelius, Jouni Lintunen
Sitz der Gesellschaft: Berlin,
Registergericht: Amtsgericht
Charlottenburg, HRB 144331 B