C++ & Qt

24 March 2026 14:18

Are you using, by any chance, any call to view->setIndexWidget()? This implies a huge performance penalty. Also, if you can move to QML, it reuses delegates and has no calls to paint(), which is quite likely to be executed in CPU instead of GPU.

C++ & Qt

24 March 2026 14:05

no I did not. i guess the table resize entire table at once. if i will manage to run profiler i will get back to you

C++ & Qt

24 March 2026 14:03

l have change resizeToContents and Stretch to FIxed and yes it is fast alright

C++ & Qt

24 March 2026 13:57

so, what can I do regarding the performance????

C++ & Qt

24 March 2026 13:55

i have this log_view inherited from table view that uses custom table model to show logs. i want the logs to have 4 columns: timestamp, level, service, message. first 3 columns should be sized to fit, fotrh should stretch to the widget end and use word wrap. i have accomplished there requirements with

log_view::log_view(log_model* lm) {
 setModel(lm);
 setAlternatingRowColors(true);
 setSelectionMode(QAbstractItemView::SelectionMode::SingleSelection);
 setSelectionBehavior(QAbstractItemView::SelectionBehavior::SelectRows);
 verticalHeader()->setSectionResizeMode(QHeaderView::ResizeMode::ResizeToContents);

 auto header = horizontalHeader();

 header->setSectionResizeMode(0, QHeaderView::ResizeMode::ResizeToContents);
 header->setSectionResizeMode(1, QHeaderView::ResizeMode::ResizeToContents);
 header->setSectionResizeMode(2, QHeaderView::ResizeMode::ResizeToContents);

 header->setSectionResizeMode(3, QHeaderView::ResizeMode::Stretch);
 setWordWrap(true);
 connect(header, &QHeaderView::sectionResized, this, 
  [this](int logicalIndex, int /*oldSize*/, int /*newSize*/) {
    if (logicalIndex == 3)
   resizeRowsToContents();
  }
 );
 
};

C++ & Qt

24 March 2026 06:32

Report sent⁣⁣⁣⁣

C++ & Qt

23 March 2026 19:07

The qmlls improvements sounds nice

C++ & Qt

16 March 2026 06:32

@Rasmussen_Maja [8318401428] banned.

C++ & Qt

16 March 2026 04:58

@admin

C++ & Qt

10 March 2026 22:15

Welcome to the group, @hishamzidanx! :-)

Wanna share your story of how you started with Qt, QML or C++? Maybe some nice feature that made you stick with it.
Rules are set on the description of the group. :)

C++ & Qt

02 March 2026 10:45

https://treelinev1.devpost.com/ anyone wants to team up for this,dm....

C++ & Qt

01 March 2026 02:24

It's been a while, I've managed to solve that, thanks anyway

C++ & Qt

28 February 2026 17:34

Good explanation, thanks!

C++ & Qt

28 February 2026 11:18

Qt’s maintainers have repeatedly clarified:

Qt is not an acronym and has no full form. It is a trademark with upper case 'Q' followed by a lower case 't'

The name was chosen to be short, distinctive, and pleasant-sounding - hence the pronunciation “cute.”

C++ & Qt

28 February 2026 11:16

“Q” as a Prefix

One of Qt’s original creators, Haavard Nord, used the letter Q as a prefix in his internal class library before Qt existed.

When Qt was being developed at Trolltech (the original company behind Qt), they continued using Q as a naming convention.

That’s why many Qt classes start with Q (e.g., QObject, QWidget, QString).

C++ & Qt

24 March 2026 14:05

I think there may be ways to make the size estimation faster

C++ & Qt

24 March 2026 14:04

Did you try running callgrind (or any other profiler) to reveal where the bootleneck is in?

C++ & Qt

24 March 2026 13:59

Is it faster if all columns have fixed with?

C++ & Qt

24 March 2026 13:57

the before and after. as you can see i get desired behaivour, the first long message row gets resized to fit the message well

C++ & Qt

24 March 2026 06:57

@GerdSimonsen [8367815543] banned.

C++ & Qt

24 March 2026 06:32

@admin

C++ & Qt

16 March 2026 07:45

Welcome to the group, @rickliu2000! :-)

Wanna share your story of how you started with Qt, QML or C++? Maybe some nice feature that made you stick with it.
Rules are set on the description of the group. :)

C++ & Qt

16 March 2026 04:58

Report sent⁣⁣⁣⁣

C++ & Qt

13 March 2026 21:02

Welcome to the group, -! :-)

Wanna share your story of how you started with Qt, QML or C++? Maybe some nice feature that made you stick with it.
Rules are set on the description of the group. :)

C++ & Qt

04 March 2026 11:11

Welcome to the group, @imrandogan46! :-)

Wanna share your story of how you started with Qt, QML or C++? Maybe some nice feature that made you stick with it.
Rules are set on the description of the group. :)

C++ & Qt

02 March 2026 09:20

Welcome to the group, @Le_Burrito! :-)

Wanna share your story of how you started with Qt, QML or C++? Maybe some nice feature that made you stick with it.
Rules are set on the description of the group. :)

C++ & Qt

01 March 2026 02:24

Everything in 3d is calculated (mostly) as vec4, mat4. In html/qml it's not your concern but in custom -- should copy past some boilerplate-repetitive template code

C++ & Qt

28 February 2026 11:30

If you have commercial Qt license, you can go for the LTS version Qt 6.8.5 or Qt 6.8.6.

If using open source pre-built libraries, then 6.9.4 and above.

These library versions support latest Android requirement: 16KB page size alignment: https://developer.android.com/guide/practices/page-sizes

For compatible NDK, JDK and Gradle versions, refer to the respective version's platform support page.

C++ & Qt

28 February 2026 11:16

The “t” from Xt (X Toolkit)

Early versions of Qt were built on top of the Xt (X Toolkit Intrinsics) framework used in the X11 windowing system on Unix.

The “t” in Qt is commonly attributed to Toolkit, influenced by Xt.

So the name “Qt” loosely reflected:
- Q (their internal prefix)
- t (from Toolkit / Xt)

C++ & Qt

28 February 2026 03:22

Welcome to the group, @hamid914! :-)

Wanna share your story of how you started with Qt, QML or C++? Maybe some nice feature that made you stick with it.
Rules are set on the description of the group. :)