Revision control
++ // Copyright (C) 2023 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "linenumbermodel.h"
++
++ #include <QQmlInfo>
++
++ /*!
++ When using an integer model based on the line count of the editor,
++ any changes in that line count cause all delegates to be destroyed
++ and recreated. That's inefficient, so instead, we add/remove model
++ items as necessary ourselves, based on the lineCount property.
++ */
++ LineNumberModel::LineNumberModel(QObject *parent)
++ : QAbstractListModel(parent)
++ {
++ }
++
++ int LineNumberModel::lineCount() const
++ {
++ return m_lineCount;
++ }
++
++ void LineNumberModel::setLineCount(int lineCount)
++ {
++ if (lineCount < 0) {
++ qmlWarning(this) << "lineCount must be greater than zero";
++ return;
++ }
++
++ if (m_lineCount == lineCount)
++ return;
++
++ if (m_lineCount < lineCount) {
++ beginInsertRows(QModelIndex(), m_lineCount, lineCount - 1);
++ m_lineCount = lineCount;
++ endInsertRows();
++ } else if (m_lineCount > lineCount) {
++ beginRemoveRows(QModelIndex(), lineCount, m_lineCount - 1);
++ m_lineCount = lineCount;
++ endRemoveRows();
++ }
++
++ emit lineCountChanged();
++ }
++
++ int LineNumberModel::rowCount(const QModelIndex &) const
++ {
++ return m_lineCount;
++ }
++
++ QVariant LineNumberModel::data(const QModelIndex &index, int role) const
++ {
++ if (!checkIndex(index) || role != Qt::DisplayRole)
++ return QVariant();
++
++ return index.row();
++ }