Custom QHeaderView doesn't adjust size

rudag

Hello

I'm subclassing QHeaderView based on this example and on @Oak77 's post here. The filters are working fine but I can't resize the headers or even click them for sorting. Method resizeColumnsToContents() also doesn't work. What might be wrong?

#include "filterheader.h"
#include "copytable.h"
#include <QHeaderView>
#include <QTableView>
#include <QLineEdit>
#include <QScrollBar>

FilterHeader::FilterHeader(QTableView *parent) :
    QHeaderView(Qt::Horizontal, parent)
{
    _padding = 4;
    setStretchLastSection(true);
    setSectionResizeMode(QHeaderView::Stretch);
    setDefaultAlignment(Qt::AlignLeft | Qt::AlignVCenter);
    setSortIndicatorShown(false);
    connect(this, &QHeaderView::sectionResized, this, &FilterHeader::adjustPositions);
    connect(parent->horizontalScrollBar(), &QScrollBar::valueChanged, this, &FilterHeader::adjustPositions);
}

FilterHeader::FilterHeader(CopyTable *parent) :
    QHeaderView(Qt::Horizontal, parent)
{
    _padding = 4;
    setStretchLastSection(true);
    setSectionResizeMode(QHeaderView::Stretch);
    setDefaultAlignment(Qt::AlignLeft | Qt::AlignVCenter);
    setSortIndicatorShown(false);
    connect(this, &QHeaderView::sectionResized, this, &FilterHeader::adjustPositions);
    connect(parent->horizontalScrollBar(), &QScrollBar::valueChanged, this, &FilterHeader::adjustPositions);
    show();
}

void FilterHeader::setFilterBoxes(int count)
{
    while (!_editors.empty())
    {
        QLineEdit* editor = _editors.back();
        _editors.pop_back();
        editor->deleteLater();
    }
    for (int i = 0; i < count; i++)
    {
        QLineEdit* editor = new QLineEdit(parentWidget());
        editor->setPlaceholderText("Filter");
        connect(editor, &QLineEdit::returnPressed, this, &FilterHeader::emitFilterActivated);
        _editors.push_back(editor);
        editor->show();
    }
    adjustPositions();
}

void FilterHeader::emitFilterActivated()
{
    emit filterActivated(_editors.indexOf(sender()));
}

QSize FilterHeader::sizeHint() const
{
    QSize size = QHeaderView::sizeHint();
    if (!_editors.empty())
    {
        int height = _editors[0]->sizeHint().height();
        size.setHeight(size.height() + height + _padding);
    }
    return size;
}

void FilterHeader::updateGeometries()
{
    if (!_editors.empty())
    {
        int height = _editors[0]->sizeHint().height();
        setViewportMargins(0, 0, 0, height + _padding);
    }
    else
        setViewportMargins(0, 0, 0, 0);

    QHeaderView::updateGeometries();
    adjustPositions();
}

void FilterHeader::adjustPositions()
{
    for (int i = 0; i < _editors.size(); i++)
    {
        QLineEdit* editor = _editors[i];
        int height = editor->sizeHint().height();
        editor->move(sectionPosition(i) - offset() + qobject_cast<QTableView*>(parent())->verticalHeader()->width(), height + (_padding / 2));
        editor->resize(sectionSize(i), height);
    }
}

QString FilterHeader::filterText(int index) const
{
    if (index >= 0 && index < _editors.size())
        return _editors[index]->text();

    return QString();
}

void FilterHeader::setFilterText(int index, const QString& text)
{
    if (index >= 0 && index < _editors.size())
        _editors[index]->setText(text);
}

void FilterHeader::clearFilters()
{
    for (auto editor : _editors)
        editor->clear();
}

Code below at the end of the function that loads the tableView

FilterHeader* header = new FilterHeader(ui->tableView);
ui->tableView->setHorizontalHeader(header);
header->setFilterBoxes(model->columnCount());
connect(header, &FilterHeader::filterActivated, this, &Extratos::handleFilterActivated);

SGaist

Hi,

setSectionResizeMode(QHeaderView::Stretch); <- this is why you cannot manually resize.

rudag

@SGaist resizing is working now! But still the headers are "unclickable", they dont even highlight if I move the cursor over them.

SGaist

If you want to sort, why are you setSortIndicatorShown(false); ?