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// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#pragma once
#include <QAbstractListModel>
#include <QFontMetrics>
#include <QList>
#include <QPointer>
QT_FORWARD_DECLARE_CLASS(QModelIndex)
class ListModelWidthCalculator : public QObject
{
Q_OBJECT
Q_PROPERTY(QAbstractItemModel *model READ model WRITE setModel NOTIFY modelChanged)
Q_PROPERTY(QString textRole MEMBER m_textRole WRITE setTextRole NOTIFY textRoleChanged)
Q_PROPERTY(QFont font MEMBER m_font WRITE setFont NOTIFY fontChanged)
Q_PROPERTY(int maxWidth READ maxWidth NOTIFY maxWidthChanged)
public:
explicit ListModelWidthCalculator(QObject *parent = nullptr);
void setModel(QAbstractItemModel *model);
void setTextRole(const QString &role);
void setFont(const QFont &font);
QAbstractItemModel *model() const;
int maxWidth() const;
signals:
void modelChanged();
void textRoleChanged(QString);
void fontChanged();
void maxWidthChanged(int);
private:
void clearConnections();
void reset();
bool updateRole();
void setMaxWidth(int maxWidth);
int widthOfText(const QString &str) const;
void onSourceItemsInserted(const QModelIndex &parent, int first, int last);
void onSourceItemsRemoved(const QModelIndex &parent, int first, int last);
void onSourceDataChanged(
const QModelIndex &topLeft, const QModelIndex &bottomRight, const QList<int> &roles);
bool isValidRow(int row);
QPointer<QAbstractItemModel> m_model;
QList<QMetaObject::Connection> m_connections;
QString m_textRole;
int m_role = -1;
QFont m_font;
QFontMetrics m_fontMetrics;
int m_maxWidth = 0;
QList<int> m_data;
};
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