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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QApplication>
#include <QHBoxLayout>
#include <QHeaderView>
#include <QPushButton>
#include <QScrollArea>
#include <QStandardItemModel>
#include <QTreeView>
#include <QTableView>
#include <QPainter>
#include <QItemDelegate>
#include <QListView>
class Delegate : public QItemDelegate
{
public:
// QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
// {
// // const int height = index.data(Qt::SizeHintRole).value<QSize>().height();
// // // get text width, see QItemDelegatePrivate::displayRect
// // const QString text = index.data(Qt::DisplayRole).toString();
// // const QRect textMaxRect(0, 0, INT_MAX / 256, height);
// // const QRect textLayoutRect = textRectangle(nullptr, textMaxRect, info.option.font, text);
// // const QRect textRect(info.textRect.x(), info.textRect.y(), textLayoutRect.width(), height);
// // const QRect layoutRect = info.checkRect | textRect;
// return QSize(100, 14);
// }
// void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
// {
// painter->save();
// painter->drawText(QPoint(0, 0), index.data(Qt::DisplayRole).toString());
// // painter->setFont(info.option.font);
// // drawBackground(painter, info.option, index);
// // drawText(painter, info.option, info.textRect, index);
// // drawCheck(painter, info.option, info.checkRect, info.checkState);
// painter->restore();
// }
};
#define KIND 1
#if KIND == 0
#define USE_TABLE 1
using Base = QTableView;
#elif KIND == 1
#define USE_TREE 1
using Base = QTreeView;
#elif KIND == 2
#define USE_LIST 1
using Base = QListView;
#endif
class View : public Base
{
public:
View()
{
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
// setItemDelegate(&m_delegate);
// headerView()->hide();
}
QSize minimumSizeHint() const final
{
return QSize(10, 10);
}
// Delegate m_delegate;
};
View *createView(QAbstractItemModel *model)
{
auto view = new View;
view->setSizeAdjustPolicy(QAbstractItemView::SizeAdjustPolicy::AdjustToContents);
view->setModel(model);
#if USE_TABLE
view->verticalHeader()->hide();
view->horizontalHeader()->hide();
#endif
#if USE_TREE
view->header()->hide();
view->resizeColumnToContents(0);
#endif
return view;
}
class MainWindow : public QWidget
{
public:
MainWindow()
{
for (int i = 0; i != 1; ++i)
model1.appendRow(QList{new QStandardItem(QString("1-%1").arg(i))});
for (int i = 0; i != 10; ++i)
model2.appendRow(QList{new QStandardItem(QString("2-%1").arg(i))});
for (int i = 0; i != 4; ++i)
model3.appendRow(QList{new QStandardItem(QString("3-%1").arg(i))});
view1 = createView(&model1);
view2 = createView(&model2);
view3 = createView(&model3);
auto scrolledWidget = new QWidget;
auto scrolledLayout = new QVBoxLayout(scrolledWidget);
scrolledLayout->addWidget(view1);
scrolledLayout->addWidget(view2);
scrolledLayout->addWidget(view3);
scrolledLayout->setSizeConstraint(QLayout::SetFixedSize);
auto scrollArea = new QScrollArea(this);
scrollArea->setSizeAdjustPolicy(QAbstractItemView::SizeAdjustPolicy::AdjustToContents);
scrollArea->setWidget(scrolledWidget);
auto button = new QPushButton("More");
connect(button, &QPushButton::clicked, this, [this, scrollArea] {
model2.appendRow(QList{new QStandardItem(QString("xxx"))});
#if USE_TREE
// Doesn't have any effect?
view1->resizeColumnToContents(0);
view2->resizeColumnToContents(0);
view3->resizeColumnToContents(0);
#endif
});
auto layout = new QVBoxLayout(this);
layout->addWidget(button);
layout->addWidget(scrollArea);
}
QStandardItemModel model1;
QStandardItemModel model2;
QStandardItemModel model3;
View *view1;
View *view2;
View *view3;
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.resize(300, 500);
w.show();
return a.exec();
}
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