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#include "CheckableItemComboBox.hpp"
#include <QStyledItemDelegate>
#include <QStandardItemModel>
#include <QStandardItem>
#include <QLineEdit>
#include <QEvent>
#include <QListView>
class CheckableItemComboBoxStyledItemDelegate
: public QStyledItemDelegate
{
public:
explicit CheckableItemComboBoxStyledItemDelegate (QObject * parent = nullptr)
: QStyledItemDelegate {parent}
{
}
void paint (QPainter * painter, QStyleOptionViewItem const& option, QModelIndex const& index) const override
{
QStyleOptionViewItem& mutable_option = const_cast<QStyleOptionViewItem&> (option);
mutable_option.showDecorationSelected = false;
QStyledItemDelegate::paint (painter, mutable_option, index);
}
};
CheckableItemComboBox::CheckableItemComboBox (QWidget * parent)
: LazyFillComboBox {parent}
, model_ {new QStandardItemModel()}
{
setModel (model_.data ());
setEditable (true);
lineEdit ()->setReadOnly (true);
lineEdit ()->installEventFilter (this);
setItemDelegate (new CheckableItemComboBoxStyledItemDelegate {this});
connect (lineEdit(), &QLineEdit::selectionChanged, lineEdit(), &QLineEdit::deselect);
connect (static_cast<QListView *> (view ()), &QListView::pressed, this, &CheckableItemComboBox::item_pressed);
connect (model_.data (), &QStandardItemModel::dataChanged, this, &CheckableItemComboBox::model_data_changed);
}
QStandardItem * CheckableItemComboBox::addCheckItem (QString const& label, QVariant const& data
, Qt::CheckState checkState)
{
auto * item = new QStandardItem {label};
item->setCheckState (checkState);
item->setData (data);
item->setFlags (Qt::ItemIsUserCheckable | Qt::ItemIsEnabled);
model_->appendRow (item);
update_text ();
return item;
}
bool CheckableItemComboBox::eventFilter (QObject * object, QEvent * event)
{
if (object == lineEdit() && event->type () == QEvent::MouseButtonPress)
{
showPopup();
return true;
}
return false;
}
void CheckableItemComboBox::update_text()
{
QString text;
for (int i = 0; i < model_->rowCount (); ++i)
{
if (model_->item (i)->checkState () == Qt::Checked)
{
if (text.size ())
{
text+= ", ";
}
text += model_->item (i)->data ().toString ();
}
}
lineEdit ()->setText (text);
}
void CheckableItemComboBox::model_data_changed ()
{
update_text ();
}
void CheckableItemComboBox::item_pressed (QModelIndex const& index)
{
QStandardItem * item = model_->itemFromIndex (index);
item->setCheckState (item->checkState () == Qt::Checked ? Qt::Unchecked : Qt::Checked);
}
#include "widgets/moc_CheckableItemComboBox.cpp"
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