Jungfraujoch/viewer/widgets/ToolbarIcons.cpp

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

#include "ToolbarIcons.h"

#include <QPainter>
#include <QPainterPath>
#include <QPolygonF>
#include <functional>

namespace {
    constexpr int S = 32;
    const QColor INK("#2B2B2B");
    const QColor DISABLED("#9AA6B3");

    using DrawFn = std::function<void(QPainter &, const QColor &)>;

    QPixmap render(const DrawFn &fn, const QColor &color) {
        QPixmap pm(S, S);
        pm.fill(Qt::transparent);
        QPainter p(&pm);
        p.setRenderHint(QPainter::Antialiasing);
        fn(p, color);
        return pm;
    }

    // Toggle-capable icon: ink when off, white when on (checked, navy background), grey when disabled.
    QIcon toggleIcon(const DrawFn &fn) {
        QIcon ic;
        ic.addPixmap(render(fn, INK), QIcon::Normal, QIcon::Off);
        ic.addPixmap(render(fn, Qt::white), QIcon::Normal, QIcon::On);
        ic.addPixmap(render(fn, Qt::white), QIcon::Active, QIcon::On);
        ic.addPixmap(render(fn, DISABLED), QIcon::Disabled, QIcon::Off);
        return ic;
    }

    void fillTriangle(QPainter &p, const QColor &c, QPointF a, QPointF b, QPointF tip) {
        p.setPen(Qt::NoPen);
        p.setBrush(c);
        p.drawPolygon(QPolygonF({a, b, tip}));
    }

    void bar(QPainter &p, const QColor &c, double x) {
        p.setPen(Qt::NoPen);
        p.setBrush(c);
        p.drawRoundedRect(QRectF(x, 9, 3.2, 14), 1.2, 1.2);
    }

    // A pair of curved arrows forming a refresh/sync ring.
    void syncArrows(QPainter &p, const QColor &c) {
        QPen pen(c, 2.4, Qt::SolidLine, Qt::RoundCap);
        p.setPen(pen);
        p.setBrush(Qt::NoBrush);
        const QRectF r(9, 9, 14, 14);
        p.drawArc(r, 40 * 16, 230 * 16);
        p.drawArc(r, (40 + 180) * 16, 230 * 16);
        // arrowheads at the two open ends
        p.setPen(Qt::NoPen);
        p.setBrush(c);
        p.drawPolygon(QPolygonF({QPointF(22, 7.5), QPointF(22, 13.5), QPointF(17.5, 11)}));
        p.drawPolygon(QPolygonF({QPointF(10, 24.5), QPointF(10, 18.5), QPointF(14.5, 21)}));
    }
}

namespace ToolbarIcons {

QIcon first() {
    return toggleIcon([](QPainter &p, const QColor &c) {
        bar(p, c, 9);
        fillTriangle(p, c, {24, 9}, {24, 23}, {14, 16});
    });
}

QIcon prev() {
    return toggleIcon([](QPainter &p, const QColor &c) {
        fillTriangle(p, c, {22, 8}, {22, 24}, {11, 16});
    });
}

QIcon next() {
    return toggleIcon([](QPainter &p, const QColor &c) {
        fillTriangle(p, c, {10, 8}, {10, 24}, {21, 16});
    });
}

QIcon last() {
    return toggleIcon([](QPainter &p, const QColor &c) {
        fillTriangle(p, c, {8, 9}, {8, 23}, {18, 16});
        bar(p, c, 19.8);
    });
}

QIcon movie() {
    return toggleIcon([](QPainter &p, const QColor &c) {
        // Two reels on top of a camera body with a lens barrel — an old-fashioned movie camera.
        p.setBrush(Qt::NoBrush);
        p.setPen(QPen(c, 1.8));
        p.drawEllipse(QPointF(10, 11.5), 3.0, 3.0);
        p.drawEllipse(QPointF(16.5, 11.5), 3.0, 3.0);
        p.setPen(Qt::NoPen);
        p.setBrush(c);
        p.drawRoundedRect(QRectF(5, 15, 16, 10), 2, 2);
        p.drawRoundedRect(QRectF(21, 17, 5, 6), 1, 1);   // lens barrel
    });
}

QIcon openFile() {
    return toggleIcon([](QPainter &p, const QColor &c) {
        // 3.5" diskette ("save" floppy): square jacket with a cut top-right corner, the metal
        // shutter across the top, and a label panel below.
        p.setPen(QPen(c, 1.8));
        p.setBrush(Qt::NoBrush);
        QPolygonF body({{6, 6}, {20, 6}, {26, 12}, {26, 26}, {6, 26}});
        p.drawPolygon(body);                              // jacket
        p.setPen(Qt::NoPen);
        p.setBrush(c);
        p.drawRect(QRectF(10, 6, 8, 5.5));                // metal shutter (top)
        p.setBrush(Qt::NoBrush);
        p.setPen(QPen(c, 1.6));
        p.drawRect(QRectF(9.5, 15.5, 13, 8.5));           // label panel
    });
}

QIcon reanalyzeImage() {
    return toggleIcon([](QPainter &p, const QColor &c) {
        p.setPen(QPen(c, 2.0));
        p.setBrush(Qt::NoBrush);
        p.drawRoundedRect(QRectF(8, 8, 16, 16), 2.5, 2.5);
        p.setBrush(c);
        p.drawEllipse(QPointF(16, 16), 2.2, 2.2);
    });
}

QIcon reanalyzeDataset() {
    return toggleIcon([](QPainter &p, const QColor &c) {
        p.setPen(QPen(c, 2.0));
        p.setBrush(Qt::NoBrush);
        for (int i = 2; i >= 0; --i)
            p.drawRoundedRect(QRectF(5 + i * 4.0, 5 + i * 4.0, 14, 14), 2.0, 2.0);
        p.setBrush(c);
        p.drawEllipse(QPointF(12, 12), 2.0, 2.0);
    });
}

QIcon httpSync(HttpState state) {
    QColor dot;
    switch (state) {
        case HttpState::Disconnected: dot = QColor("#9AA6B3"); break;   // grey
        case HttpState::Live:         dot = QColor("#5CB85C"); break;   // green
        case HttpState::Frozen:       dot = QColor("#E9A23B"); break;   // amber
    }
    auto draw = [dot](QPainter &p, const QColor &c) {
        syncArrows(p, c);
        p.setPen(QPen(Qt::white, 1.2));
        p.setBrush(dot);
        p.drawEllipse(QPointF(24, 24), 4.2, 4.2);   // status dot
    };
    QIcon ic;
    ic.addPixmap(render(draw, INK), QIcon::Normal, QIcon::Off);
    ic.addPixmap(render(draw, DISABLED), QIcon::Disabled, QIcon::Off);
    return ic;
}

QString buttonStyle() {
    return QStringLiteral(
        "QToolButton { border:none; border-radius:4px; padding:4px 6px; color:#2B2B2B;"
        " background:transparent; }"
        " QToolButton:hover { background:rgba(250,114,104,0.20); }"
        " QToolButton:checked { background:#1F3A5F; color:white; }"
        " QToolButton:disabled { color:#9AA6B3; }");
}

}  // namespace ToolbarIcons