Jungfraujoch/viewer/widgets/CollapsibleSection.cpp

// SPDX-FileCopyrightText: 2026 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only

#include "CollapsibleSection.h"
#include "../ViewerTheme.h"

#include <algorithm>
#include <QToolButton>
#include <QVBoxLayout>

CollapsibleSection::CollapsibleSection(const QString &title, QWidget *parent) : QWidget(parent) {
    auto *v = new QVBoxLayout(this);
    v->setContentsMargins(0, 0, 0, 0);
    v->setSpacing(0);

    header_ = new QToolButton(this);
    header_->setText(title);
    header_->setCheckable(true);
    header_->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
    header_->setArrowType(Qt::RightArrow);
    header_->setCursor(Qt::PointingHandCursor);
    header_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
    SetThemedStyleSheet(header_, [] {
        return QString("QToolButton { color:%1; font-weight:bold; text-align:left;"
                       " padding:3px 6px 3px 6px; border:none;"
                       " border-left:3px solid #FA7268; border-bottom:1px solid #FA7268; background:transparent; }")
            .arg(AccentTextColor().name());
    });

    content_ = new QWidget(this);
    content_->setVisible(false);

    v->addWidget(header_);
    v->addWidget(content_);

    connect(header_, &QToolButton::toggled, this, [this](bool on) {
        content_->setVisible(on);
        header_->setArrowType(on ? Qt::DownArrow : Qt::RightArrow);
    });
}

void CollapsibleSection::setContentLayout(QLayout *layout) {
    content_->setLayout(layout);
}

void CollapsibleSection::setExpanded(bool on) {
    header_->setChecked(on);
}

QSize CollapsibleSection::minimumSizeHint() const {
    // A hidden widget does not count towards its parent's layout, so the folded content is measured here.
    QSize s = QWidget::minimumSizeHint();
    s.setWidth(std::max(s.width(), content_->minimumSizeHint().width()));
    return s;
}