C++ & Qt

04 April 2026 19:14

I want to ask something straight

What are the chances to get a job being proficient in QT as compared to being proficient in backend development in Java in the current job market especially in countries like India?

I am on the aisle deciding which edge to choose

Genuine help would be appreciated
Thank you reading

C++ & Qt

03 April 2026 00:50

Welcome to the group, @Wincreato! :-)

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 April 2026 13:24

@kay_triller03 [1426681789] banned.

C++ & Qt

01 April 2026 13:16

@admin

C++ & Qt

28 March 2026 20:00

Welcome to the group, @Gencemiri! :-)

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

25 March 2026 10:26

maybe i am missing something

C++ & Qt

25 March 2026 10:22

and this works with 10k messages well

C++ & Qt

25 March 2026 10:20

and damn right it is faster

C++ & Qt

25 March 2026 09:57

perhaps it doesn't have to be perfect either? Skipping some lines when resizing isn't that much of a problem perhaps?

C++ & Qt

25 March 2026 09:55

also wondering what will happen if i will just be getting element in the vierwport and calling the resizeRowToContents

C++ & Qt

25 March 2026 09:53

or only on visible elements

C++ & Qt

25 March 2026 09:43

resizeToContents on first 3 columns also make gui thread go up to 100% but without visible lag. this could be made fixed size thats all

C++ & Qt

25 March 2026 09:40

so if i set all resize policies to fixed without word wrap and the 4th column to stretch(cant see full mesage) or interactive(this could work but word wrap + stretch would be beter), i get decent performance

if on to of previous i do word wrap, nothing is changing because the row height is fixed, but if i enable resizeToContents on the vertical header i get huuuge performance penalty

C++ & Qt

25 March 2026 09:26

god damn there is no valgrind on mac arm yet, constant pain in the butt, i have to use pc for this purposes

C++ & Qt

25 March 2026 09:04

so this behave same on my air m2. scroll is takin 2-3% of cpu is short bursts (idk seems ok), resize with mouse eats up entire gui thread/core to 100%

C++ & Qt

04 April 2026 17:08

just a showcase: the daw / media sequencer I've been building for some years, ossia score (https://ossia.io) with its Qt RHI shader pipeline finally running through QRhi in a webbrowser:

C++ & Qt

01 April 2026 13:25

@Gencemiri [5515683351] banned.

C++ & Qt

01 April 2026 13:16

Report sent⁣⁣⁣⁣

C++ & Qt

30 March 2026 14:55

For members serious about growth, Alex Gonzalez is the mentor to follow. His crypto trading tips enabled me to realize $6,000 in profits this month.

C++ & Qt

25 March 2026 11:46

I think the main thing is to not let it recalculate everything at 60 Hz (or worse)

C++ & Qt

25 March 2026 10:26

i would like to hear some suggestions bout the "not letting the table view do something by itself on resize for all rows/columns"

C++ & Qt

25 March 2026 10:22

but yea the scroll bar does not feel alright

C++ & Qt

25 March 2026 10:19

so i managed to make this

log_view::log_view(log_model* lm)
    : QTableView(nullptr) {
 setModel(lm);
 setAlternatingRowColors(true);
 setSelectionMode(QAbstractItemView::SingleSelection);
 setSelectionBehavior(QAbstractItemView::SelectRows);
 setWordWrap(true);

 verticalHeader()->setSectionResizeMode(QHeaderView::Fixed);
 verticalHeader()->setDefaultSectionSize(24);

 auto header = horizontalHeader();
 // i gave up on dynamic columns, just eyeballed the default size and let the
 // user change it god damn
 header->setSectionResizeMode(0, QHeaderView::Interactive);
 header->resizeSection(0, 140);
 header->setSectionResizeMode(1, QHeaderView::Interactive);
 header->resizeSection(1, 80);
 header->setSectionResizeMode(2, QHeaderView::Interactive);
 header->resizeSection(2, 73);
 header->setSectionResizeMode(3, QHeaderView::Stretch);

 connect(
  header, &QHeaderView::sectionResized,
  this, &log_view::on_section_resized
 );

 connect(
  verticalScrollBar(), &QScrollBar::valueChanged,
  this, &log_view::schedule_visible_row_resize
 );

 connect(
  model(), &QAbstractItemModel::dataChanged, this,
  [this](const QModelIndex& topLeft, const QModelIndex& bottomRight) {
   if (topLeft.column() == 3) {
    for (int r = topLeft.row(); r <= bottomRight.row(); ++r)
    if (visualRect(model()->index(r, 0)).intersects(viewport()->rect()))
     resizeRowToContents(r);
   }
  }
 );

 QMetaObject::invokeMethod(this, &log_view::schedule_visible_row_resize, Qt::QueuedConnection);
}

void log_view::on_section_resized(int logicalIndex, int oldSize, int newSize) {
 if (logicalIndex == 3)
  schedule_visible_row_resize();
}

void log_view::schedule_visible_row_resize() {
 QMetaObject::invokeMethod(
  this, &log_view::update_visible_row_heights,
  Qt::QueuedConnection
 );
}

void log_view::update_visible_row_heights() {
 if (!model() || model()->rowCount() == 0)
  return;

 setUpdatesEnabled(false);

 const int first = rowAt(0);
 if (first < 0) {
  setUpdatesEnabled(true);
  return;
 }

 int last = rowAt(viewport()->height() - 1);
 if (last < 0)
  last = model()->rowCount() - 1;

 for (int row = first; row <= last; ++row)
  resizeRowToContents(row);

 setUpdatesEnabled(true);
}

void log_view::resizeEvent(QResizeEvent* ev) {
 setUpdatesEnabled(false); // importand to not let the table view do nothin by itlself
 QTableView::resizeEvent(ev);
 setUpdatesEnabled(true);
 schedule_visible_row_resize();
}

Qt’s standard “do it once, later” pattern

When the current event loop finishes processing all the resize/scroll/paint events that are already queued, then run this once

C++ & Qt

25 March 2026 09:55

but the scrollbar wont cbe in correct scale

C++ & Qt

25 March 2026 09:54

it has to look at all elements above at least (and perhaps the rest of them to get the scrollbar size right)

C++ & Qt

25 March 2026 09:52

With dynamic row height it has to do that i suppose, but perhaps it could happen less often

C++ & Qt

25 March 2026 09:41

i wonder as if the widget tries to recalculate all the heights, maybe this could be optimized to only update visible elements somehow

C++ & Qt

25 March 2026 09:27

not as bad as this though

C++ & Qt

25 March 2026 09:13

this defenitetly helps with performance with 200 elements. but with 10k it is not enough

C++ & Qt

25 March 2026 07:09

@Dolfost i tried this and it doesn't feel that slow on my machine:

QStandardItemModel* lm = new QStandardItemModel();
lm->setColumnCount(4);

for(int i = 0; i < 2000; ++i)
{
QList<QStandardItem*> row;

row << new QStandardItem(QString::number(i)) << new QStandardItem("A") << new QStandardItem("B");
if(i % 20 == 0)
row << new QStandardItem("CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC CCCCCCCCCC ");
else
row << new QStandardItem("C");

lm->appendRow(row);
}

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

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