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#include "CheckableItemComboBox.h"
#include <QEvent>
#include <QLineEdit>
#include <QListView>
#include <QStandardItem>
#include <QStandardItemModel>
#include <QStyledItemDelegate>
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 "moc_CheckableItemComboBox.cpp"
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