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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
#include "listmodelwidthcalculator.h"
#include <QApplication>
ListModelWidthCalculator::ListModelWidthCalculator(QObject *parent)
: QObject(parent)
, m_fontMetrics(qApp->font())
{}
void ListModelWidthCalculator::setModel(QAbstractItemModel *model)
{
if (m_model == model)
return;
clearConnections();
m_model = model;
if (m_model) {
m_connections << connect(
m_model,
&QAbstractItemModel::rowsInserted,
this,
&ListModelWidthCalculator::onSourceItemsInserted);
m_connections << connect(
m_model,
&QAbstractItemModel::rowsRemoved,
this,
&ListModelWidthCalculator::onSourceItemsRemoved);
m_connections << connect(
m_model,
&QAbstractItemModel::dataChanged,
this,
&ListModelWidthCalculator::onSourceDataChanged);
m_connections << connect(
m_model, &QAbstractItemModel::modelReset, this, &ListModelWidthCalculator::reset);
}
emit modelChanged();
if (!updateRole())
reset();
}
void ListModelWidthCalculator::setTextRole(const QString &role)
{
if (m_textRole == role)
return;
m_textRole = role;
emit textRoleChanged(m_textRole);
updateRole();
}
void ListModelWidthCalculator::setFont(const QFont &font)
{
if (m_font == font)
return;
m_font = font;
emit fontChanged();
reset();
}
QAbstractItemModel *ListModelWidthCalculator::model() const
{
return m_model.get();
}
int ListModelWidthCalculator::maxWidth() const
{
return m_maxWidth;
}
void ListModelWidthCalculator::clearConnections()
{
for (QMetaObject::Connection &connection : m_connections)
disconnect(connection);
m_connections.clear();
}
void ListModelWidthCalculator::reset()
{
int maxW = 0;
m_data.clear();
if (m_model) {
const int rows = m_model->rowCount();
m_data.reserve(rows);
for (int row = 0; row < rows; ++row) {
const QModelIndex &modelIdx = m_model->index(row, 0);
const QString &text = modelIdx.data(m_role).toString();
const int textWidth = widthOfText(text);
m_data.append(textWidth);
if (textWidth > maxW)
maxW = textWidth;
}
}
setMaxWidth(maxW);
}
/*!
* \internal
* \brief ListModelWidthCalculator::updateRole
* \return True if role is updated. It means that reset() is called.
*/
bool ListModelWidthCalculator::updateRole()
{
int newRole = -1;
if (m_model && !m_textRole.isEmpty())
newRole = m_model->roleNames().key(m_textRole.toUtf8());
if (m_role != newRole) {
m_role = newRole;
reset();
return true;
}
return false;
}
void ListModelWidthCalculator::setMaxWidth(int maxWidth)
{
if (m_maxWidth == maxWidth)
return;
m_maxWidth = maxWidth;
emit maxWidthChanged(m_maxWidth);
}
int ListModelWidthCalculator::widthOfText(const QString &str) const
{
const int nIdx = str.indexOf('\n');
const QString &firstLineText = (nIdx > -1) ? str.left(nIdx) : str;
return std::ceil(m_fontMetrics.boundingRect(firstLineText).width());
}
void ListModelWidthCalculator::onSourceItemsInserted(const QModelIndex &, int first, int last)
{
if (!isValidRow(first)) {
reset();
return;
}
int maxW = maxWidth();
m_data.reserve(m_data.size() + last - first + 1);
const QList<int> &tail = m_data.mid(first, -1);
m_data.remove(first, -1);
for (int row = first; row <= last; ++row) {
const QModelIndex &modelIdx = m_model->index(row, 0);
const QString &text = modelIdx.data(m_role).toString();
const int textWidth = widthOfText(text);
m_data.append(textWidth);
if (textWidth > maxW)
maxW = textWidth;
}
m_data.append(tail);
setMaxWidth(maxW);
}
void ListModelWidthCalculator::onSourceItemsRemoved(const QModelIndex &, int first, int last)
{
if (!isValidRow(first) || !isValidRow(last)) {
reset();
return;
}
int maxW = maxWidth();
bool resetRequired = false;
for (int row = first; row <= last; ++row) {
const int savedWidth = m_data.at(row);
if (savedWidth == maxW) {
resetRequired = true;
break;
}
}
if (resetRequired)
reset();
else
m_data.remove(first, last - first + 1);
}
void ListModelWidthCalculator::onSourceDataChanged(
const QModelIndex &topLeft, const QModelIndex &bottomRight, const QList<int> &roles)
{
if (!roles.contains(m_role))
return;
const int first = topLeft.row();
const int last = bottomRight.row();
if (!isValidRow(first) || !isValidRow(last)) {
reset();
return;
}
int maxW = maxWidth();
for (int row = first; row <= last; ++row) {
const QModelIndex &modelIdx = m_model->index(row, 0);
const QString &text = modelIdx.data(m_role).toString();
const int textWidth = widthOfText(text);
const int savedWidth = m_data.at(row);
if (textWidth == savedWidth)
continue;
if (textWidth > maxW)
maxW = textWidth;
m_data[row] = textWidth;
}
setMaxWidth(maxW);
}
bool ListModelWidthCalculator::isValidRow(int row)
{
return row > -1 && row < m_data.size();
}
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