QHeaderView(Qt::Horizontal, parent)

{

// Activate the click signals to allow sorting

setSectionsClickable(true);

// But use our own indicators allowing multi-column sorting

setSortIndicatorShown(false);

// Make sure to not automatically resize the columns according to the contents

setSectionResizeMode(QHeaderView::Interactive);

// Highlight column headers of selected cells to emulate spreadsheet behaviour

setHighlightSections(true);

// Do some connects: Basically just resize and reposition the input widgets whenever anything changes

connect(this, &FilterTableHeader::sectionResized, this, &FilterTableHeader::adjustPositions);

connect(parent->horizontalScrollBar(), &QScrollBar::valueChanged, this, &FilterTableHeader::adjustPositions);

connect(parent->verticalScrollBar(), &QScrollBar::valueChanged, this, &FilterTableHeader::adjustPositions);

// Set custom context menu handling

setContextMenuPolicy(Qt::CustomContextMenu);

{

// Delete all the current filter widgets

qDeleteAll(filterWidgets);

filterWidgets.clear();

// And generate a bunch of new ones

for(size_t i=0;i < number; ++i)

{

FilterLineEdit* l = new FilterLineEdit(this, &filterWidgets, i);

l->setVisible(i >= number_of_hidden_filters);

connect(l, &FilterLineEdit::delayedTextChanged, this, &FilterTableHeader::inputChanged);

connect(l, &FilterLineEdit::addFilterAsCondFormat, this, &FilterTableHeader::addFilterAsCondFormat);

connect(l, &FilterLineEdit::clearAllCondFormats, this, &FilterTableHeader::clearAllCondFormats);

connect(l, &FilterLineEdit::editCondFormats, this, &FilterTableHeader::editCondFormats);

filterWidgets.push_back(l);

}

// Position them correctly

updateGeometries();

{

// For the size hint just take the value of the standard implementation and add the height of a input widget to it if necessary

QSize s = QHeaderView::sizeHint();

if(filterWidgets.size())

s.setHeight(s.height() + filterWidgets.at(0)->sizeHint().height() + 4); // The 4 adds just adds some extra space

return s;

{

// If there are any input widgets add a viewport margin to the header to generate some empty space for them which is not affected by scrolling

if(filterWidgets.size())

setViewportMargins(0, 0, 0, filterWidgets.at(0)->sizeHint().height());

else

setViewportMargins(0, 0, 0, 0);

// Now just call the parent implementation and reposition the input widgets

QHeaderView::updateGeometries();

adjustPositions();

{

// Loop through all widgets

for(int i=0;i < static_cast<int>(filterWidgets.size()); ++i)

{

// Get the current widget, move it and resize it

QWidget* w = filterWidgets.at(static_cast<size_t>(i));

// The two adds some extra space between the header label and the input widget

int y = QHeaderView::sizeHint().height() + 2;

if (QApplication::layoutDirection() == Qt::RightToLeft)

w->move(width() - (sectionPosition(i) + sectionSize(i) - offset()), y);

else

w->move(sectionPosition(i) - offset(), y);

w->resize(sectionSize(i), w->sizeHint().height());

}

{

// Just get the column number and the new value and send them to anybody interested in filter changes

emit filterChanged(sender()->property("column").toUInt(), new_value);

{

// Just get the column number and the new value and send them to anybody interested in new conditional formatting

emit addCondFormat(sender()->property("column").toUInt(), filter);

{

// Just get the column number and send it to anybody responsible or interested in clearing conditional formatting

emit allCondFormatsCleared(sender()->property("column").toUInt());

{

// Just get the column number and the new value and send them to anybody interested in editing conditional formatting

emit condFormatsEdited(sender()->property("column").toUInt());

{

for(FilterLineEdit* filterLineEdit : filterWidgets)

filterLineEdit->clear();

{

if(column < filterWidgets.size())

filterWidgets.at(column)->setText(value);