QHeaderView background color for each section

[rudag]

I have the same problem as in this topic:
https://forum.qt.io/topic/144127/how-paint-a-background-section-in-a-qheaderview

I have a QTableView with dynamic number of headers and would like to have them in different colors (logic will come later, just need to paint right now)

My last attempt was:

void HeaderView::paintSection(QPainter * painter, const QRect & rect, int logicalIndex) const
{
    QVariant bg = model()->headerData(logicalIndex, Qt::Horizontal, Qt::BackgroundRole);
    painter->save();
    QHeaderView::paintSection(painter, rect, logicalIndex);
    painter->restore();
    if(bg.isValid())
        painter->fillRect(rect, bg.value<QBrush>());
}

Also I dont know how to override initStyleOptionForIndex() as @Christian-Ehrlicher mentioned in the topic above. Any help?

[Christian Ehrlicher]

@rudag said in QHeaderView background color for each section:

bg.value<QBrush>()

Do you really return a QBrush in headerData() for Qt::BackgroundRole?

[jsulm]

This post is deleted!

[rudag]

@Christian-Ehrlicher Yes, like below:

modelM->clear();
modelM->setColumnCount(ops.count());
modelM->setRowCount(funcs.count());
modelM->setHorizontalHeaderLabels(ops);
modelM->setVerticalHeaderLabels(funcs);
//setting only one headerData to test
modelM->setHeaderData(0, Qt::Horizontal, QBrush(Qt::blue), Qt::BackgroundRole);

[Christian Ehrlicher]

@rudag said in QHeaderView background color for each section:

modelM->setHeaderData(0, Qt::Horizontal, QBrush(Qt::blue), Qt::BackgroundRole);

Here you only call setData()... but i asked what data() returns.

[jeremy_k]

@rudag said in QHeaderView background color for each section:

I have a QTableView with dynamic number of headers and would like to have them in different colors (logic will come later, just need to paint right now)

My last attempt was:

You didn't say what is unsatisfactory about this attempt.

Is there another reason to implement a custom header view? QHeaderView already supports a background color.

#include <QApplication>
#include <QTableView>
#include <QStandardItemModel>
#include <QColor>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QStandardItemModel model;
    QStandardItem h1("test");
    model.appendRow(&h1);

    model.setHeaderData(0, Qt::Orientation::Horizontal, QColorConstants::Green, Qt::ItemDataRole::BackgroundRole);

    QTableView view;
    view.setModel(&model);
    view.show();
    return a.exec();
}

[rudag]

@Christian-Ehrlicher said in QHeaderView background color for each section:

Here you only call setData()... but i asked what data() returns.

It's working now. I didn't know I had to call QHeaderView's show() explicitly.

painter->drawText(rect, Qt::AlignCenter, model()->headerData(logicalIndex, Qt::Horizontal, Qt::DisplayRole).toString());

But it's lost the mouse hover effect, bold text when column is selected, etc.. do I really have to write all these effects?

@jeremy_k said in QHeaderView background color for each section:

You didn't say what is unsatisfactory about this attempt.

Is there another reason to implement a custom header view? QHeaderView already supports a background color.

Tried your setHeaderData() and didn't work. I really would like a solution without subclass. I tried like bellow and background is okay, but it doesn't show the text.

QStandardItem *i = new QStandardItem("Test");
i->setBackground(QBrush(Qt::yellow));
modelM->setHorizontalHeaderItem(0, i);

[jeremy_k]

@rudag said in QHeaderView background color for each section:

Tried your setHeaderData() and didn't work. I really would like a solution without subclass. I tried like bellow and background is okay, but it doesn't show the text.

Did you try the full and unmodified program? That suggests that you've found a bug in Qt. If it was instead adapted into a non-working program, that doesn't tell me anything meaningful. The snippets of the nonworking program posted so far aren't enough to work with.