variantdelegate.cpp Example File

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#include <QtWidgets> #include "variantdelegate.h" VariantDelegate::VariantDelegate(QObject *parent) : QItemDelegate(parent) { boolExp.setPattern("true|false"); boolExp.setPatternOptions(QRegularExpression::CaseInsensitiveOption); byteArrayExp.setPattern("[\\x00-\\xff]*"); charExp.setPattern("."); colorExp.setPattern("^\\(([0-9]*),([0-9]*),([0-9]*),([0-9]*)\\)$"); doubleExp.setPattern(""); pointExp.setPattern("^\\((-?[0-9]*),(-?[0-9]*)\\)$"); rectExp.setPattern("^\\((-?[0-9]*),(-?[0-9]*),(-?[0-9]*),(-?[0-9]*)\\)$"); signedIntegerExp.setPattern("-?[0-9]*"); sizeExp = pointExp; unsignedIntegerExp.setPattern("[0-9]*"); dateExp.setPattern("([0-9]{,4})-([0-9]{,2})-([0-9]{,2})"); timeExp.setPattern("([0-9]{,2}):([0-9]{,2}):([0-9]{,2})"); dateTimeExp.setPattern(dateExp.pattern() + 'T' + timeExp.pattern()); } void VariantDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const { if (index.column() == 2) { QVariant value = index.model()->data(index, Qt::UserRole); if (!isSupportedType(value.type())) { QStyleOptionViewItem myOption = option; myOption.state &= ~QStyle::State_Enabled; QItemDelegate::paint(painter, myOption, index); return; } } QItemDelegate::paint(painter, option, index); } QWidget *VariantDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem & /* option */, const QModelIndex &index) const { if (index.column() != 2) return 0; QVariant originalValue = index.model()->data(index, Qt::UserRole); if (!isSupportedType(originalValue.type())) return 0; QLineEdit *lineEdit = new QLineEdit(parent); lineEdit->setFrame(false); QRegularExpression regExp; switch (originalValue.type()) { case QVariant::Bool: regExp = boolExp; break; case QVariant::ByteArray: regExp = byteArrayExp; break; case QVariant::Char: regExp = charExp; break; case QVariant::Color: regExp = colorExp; break; case QVariant::Date: regExp = dateExp; break; case QVariant::DateTime: regExp = dateTimeExp; break; case QVariant::Double: regExp = doubleExp; break; case QVariant::Int: case QVariant::LongLong: regExp = signedIntegerExp; break; case QVariant::Point: regExp = pointExp; break; case QVariant::Rect: regExp = rectExp; break; case QVariant::Size: regExp = sizeExp; break; case QVariant::Time: regExp = timeExp; break; case QVariant::UInt: case QVariant::ULongLong: regExp = unsignedIntegerExp; break; default: ; } if (regExp.isValid()) { QValidator *validator = new QRegularExpressionValidator(regExp, lineEdit); lineEdit->setValidator(validator); } return lineEdit; } void VariantDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const { QVariant value = index.model()->data(index, Qt::UserRole); if (QLineEdit *lineEdit = qobject_cast<QLineEdit *>(editor)) lineEdit->setText(displayText(value)); } void VariantDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const { QLineEdit *lineEdit = qobject_cast<QLineEdit *>(editor); if (!lineEdit->isModified()) return; QString text = lineEdit->text(); const QValidator *validator = lineEdit->validator(); if (validator) { int pos; if (validator->validate(text, pos) != QValidator::Acceptable) return; } QVariant originalValue = index.model()->data(index, Qt::UserRole); QVariant value; QRegularExpressionMatch match; switch (originalValue.type()) { case QVariant::Char: value =; break; case QVariant::Color: match = colorExp.match(text); value = QColor(qMin(match.captured(1).toInt(), 255), qMin(match.captured(2).toInt(), 255), qMin(match.captured(3).toInt(), 255), qMin(match.captured(4).toInt(), 255)); break; case QVariant::Date: { QDate date = QDate::fromString(text, Qt::ISODate); if (!date.isValid()) return; value = date; } break; case QVariant::DateTime: { QDateTime dateTime = QDateTime::fromString(text, Qt::ISODate); if (!dateTime.isValid()) return; value = dateTime; } break; case QVariant::Point: match = pointExp.match(text); value = QPoint(match.captured(1).toInt(), match.captured(2).toInt()); break; case QVariant::Rect: match = rectExp.match(text); value = QRect(match.captured(1).toInt(), match.captured(2).toInt(), match.captured(3).toInt(), match.captured(4).toInt()); break; case QVariant::Size: match = sizeExp.match(text); value = QSize(match.captured(1).toInt(), match.captured(2).toInt()); break; case QVariant::StringList: value = text.split(','); break; case QVariant::Time: { QTime time = QTime::fromString(text, Qt::ISODate); if (!time.isValid()) return; value = time; } break; default: value = text; value.convert(originalValue.type()); } model->setData(index, displayText(value), Qt::DisplayRole); model->setData(index, value, Qt::UserRole); } bool VariantDelegate::isSupportedType(QVariant::Type type) { switch (type) { case QVariant::Bool: case QVariant::ByteArray: case QVariant::Char: case QVariant::Color: case QVariant::Date: case QVariant::DateTime: case QVariant::Double: case QVariant::Int: case QVariant::LongLong: case QVariant::Point: case QVariant::Rect: case QVariant::Size: case QVariant::String: case QVariant::StringList: case QVariant::Time: case QVariant::UInt: case QVariant::ULongLong: return true; default: return false; } } QString VariantDelegate::displayText(const QVariant &value) { switch (value.type()) { case QVariant::Bool: case QVariant::ByteArray: case QVariant::Char: case QVariant::Double: case QVariant::Int: case QVariant::LongLong: case QVariant::String: case QVariant::UInt: case QVariant::ULongLong: return value.toString(); case QVariant::Color: { QColor color = qvariant_cast<QColor>(value); return QString("(%1,%2,%3,%4)") .arg( .arg(; } case QVariant::Date: return value.toDate().toString(Qt::ISODate); case QVariant::DateTime: return value.toDateTime().toString(Qt::ISODate); case QVariant::Invalid: return "<Invalid>"; case QVariant::Point: { QPoint point = value.toPoint(); return QString("(%1,%2)").arg(point.x()).arg(point.y()); } case QVariant::Rect: { QRect rect = value.toRect(); return QString("(%1,%2,%3,%4)") .arg(rect.x()).arg(rect.y()) .arg(rect.width()).arg(rect.height()); } case QVariant::Size: { QSize size = value.toSize(); return QString("(%1,%2)").arg(size.width()).arg(size.height()); } case QVariant::StringList: return value.toStringList().join(','); case QVariant::Time: return value.toTime().toString(Qt::ISODate); default: break; } return QString("<%1>").arg(value.typeName()); }

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