{

explicit FilterLineEdit(QWidget* parent, QList<FilterLineEdit*>* filters, int columnnum) : QLineEdit(parent), filterList(filters), columnNumber(columnnum)

{

setPlaceholderText(tr("Filter"));

#if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)

setClearButtonEnabled(true);

#endif

setProperty("column", columnnum); // Store the column number for later use

}

void keyReleaseEvent(QKeyEvent* event)

{

if(event->key() == Qt::Key_Tab)

{

if(columnNumber < filterList->size() - 1)

{

filterList->at(columnNumber + 1)->setFocus();

event->accept();

}

} else if(event->key() == Qt::Key_Backtab) {

if(columnNumber > 0)

{

filterList->at(columnNumber - 1)->setFocus();

event->accept();

}

}

}

QList<FilterLineEdit*>* filterList;

int columnNumber;

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()));

// Set custom context menu handling

setContextMenuPolicy(Qt::CustomContextMenu);

{

// 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)

{

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

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 resize 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);

{

foreach (FilterLineEdit* filterLineEdit, filterWidgets)

filterLineEdit->clear();

{

if(column < filterWidgets.size())

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