My table does't not dynamic update.

architect23

I have next code, but my tableview does't update dynamic, where I wrong?

QSortFilterProxyModel proxyModel;
proxyModel.setSourceModel(&m_myModel);
tableView->setModel(&proxyModel);
tableView->setSortingEnabled(true);
proxyModel.setDynamicSortFilter(true); <-----------------

jsulm

@architect23 Isn't your proxyModel a local variable which is deleted as soon as it leaves its scope?

architect23

it is field of class(global variable)

architect23

simple sort by header column is worked, but dynamic does't work

JonB

@architect23
How do we know "dynamic does't work"? What do you do to cause it to be activated, how does it come out and what should it be? In the sample you provide what column are you expecting it to be sorted by anyway?

architect23

I solved my problem:
before beginInsertRows(), I set beginResetModel() and after endInsertRows(), I set endResetModel()

Christian Ehrlicher

This is no solution but a hacky workaround... You should better fix your problem instead.

architect23

No problem, help me:)

Christian Ehrlicher

You don't post valid, compileable code, how should we help?
This problem could be stripped down to maybe 50 lines of code. If you provide it and it still does not work we might be able to help.

JonB

As @Christian-Ehrlicher says. Start by checking your row number parameters to beginInsertRows() and which of the two models you are inserting into.

architect23

On the contrary, I just gave a piece of code where a sorting model was created and some methods were applied to it. If something was missing, then I expected to hear this: why do you need my entire code? No one will look at it.

Christian Ehrlicher

@architect23 said in My table does't not dynamic update.:

No one will look at it.

Correct, therefore I requested a minimal, compilable example - as I already wrote I would guess it's not more than 50 lines of code.
The code you gave told us only that you create a local QSortFilterProxyModel which will be destructed on function exit. Also you did not show use where and how you update the data...

architect23

Can you give me simple example for dynamic sort?

Pl45m4

@architect23

https://doc.qt.io/qt-6/qtwidgets-itemviews-customsortfiltermodel-example.html

architect23

		QVariant lhs_data = model->data(left, Qt::DisplayRole);<-------------- 0.00
		QVariant rhs_data = model->data(right, Qt::DisplayRole);<--------------5.37

In first string I always get zero, I don't understand why?

Christian Ehrlicher

This example works fine for me, prove us that there is an error in Qt:

int main(int argc, char* argv[])
{
	QApplication app(argc, argv);
	QTableView tv;
	tv.setSortingEnabled(true);
	auto model = new QStandardItemModel;
	for (int i = 0; i < 10; ++i)
		model->appendRow(new QStandardItem(QString::number(i + 1)));
	auto proxy = new QSortFilterProxyModel;
	proxy->setSourceModel(model);
	proxy->sort(0);
	proxy->setDynamicSortFilter(true);
	QTimer t;
	t.start(1000);
	auto rand = QRandomGenerator::global();
	QObject::connect(&t, &QTimer::timeout, [&]() {
		int row = rand->bounded(0, 9);
		auto item = model->item(row);
		item->setText(QString::number(rand->bounded(1, 200)));
	});
	tv.setModel(proxy);
	tv.show();
	return app.exec();
}

Attention: It sorts by DisplayRole so "123" < "80"

JonB

@architect23

In first string I always get zero, I don't understand why?

Depends what data you have in model->data(left), which nobody but you knows, and for that matter which model model refers to. How should anyone answer?

architect23

I solved my problem, no dynamic sort because no data yet, but I don't understand I have two string with two function:
function1()
function2()
in function1():

beginInsertRows(model_index, parent_filter->rowCount(), parent_filter->rowCount());
	parent_filter->InsertChild(filterNode);
	endInsertRows();

and it callback function lessThan()-OK
in function2():

beginInsertRows(model_index, parent_filter->rowCount(), parent_filter->rowCount());
	parent_filter->InsertChild(new_row);
	endInsertRows();

but it did't callback lessThan() after endInsertRows()-why?????

JonB

@architect23
Since the code is identical the difference must come from either the value of filterNode versus new_row or the content of the node pointed to by parent_filter.

Maybe lessThan(), which is needed for sorting, is not called because e.g. parent_filter has no children in one case so it does not need to compare to sort?