QHeaderView(Qt::Horizontal, parent)

{

// Activate the click signals to allow sorting

#if QT_VERSION >= 0x050000

setSectionsClickable(true);

#else

setClickable(true);

#endif

setSortIndicatorShown(true);

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

connect(this, SIGNAL(sectionResized(int,int,int)), this, SLOT(adjustPositions()));

connect(parent->horizontalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(adjustPositions()));

connect(parent->verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(adjustPositions()));

{

// Delete all the current filter widgets

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

delete filterWidgets.at(i);

filterWidgets.clear();

// And generate a bunch of new ones

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

{

QLineEdit* l = new QLineEdit(this);

l->setPlaceholderText(tr("Filter"));

l->setProperty("column", i); // Store the column number for later use

l->setVisible(i>0); // This hides the first input widget which belongs to the hidden rowid column

connect(l, SIGNAL(textChanged(QString)), this, SLOT(inputChanged(QString)));

filterWidgets.push_back(l);

}

// Position them correctly

adjustPositions();

{

// 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() + 5); // The 5 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 < filterWidgets.size(); ++i)

{

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

QWidget* w = filterWidgets.at(i);

w->move(sectionPosition(i) - offset(), filterWidgets.at(i)->sizeHint().height() + 2); // The two adds some extra space between the header label and the input widget

w->resize(sectionSize(i), filterWidgets.at(i)->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").toInt(), new_value);