guiutil.cpp

// Copyright (c) 2011-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <qt/guiutil.h>

#include <qt/bitcoinaddressvalidator.h>
#include <qt/bitcoinunits.h>
#include <qt/qvalidatedlineedit.h>
#include <qt/sendcoinsrecipient.h>

#include <base58.h>
#include <chainparams.h>
#include <interfaces/node.h>
#include <key_io.h>
#include <policy/policy.h>
#include <primitives/transaction.h>
#include <protocol.h>
#include <script/script.h>
#include <script/standard.h>
#include <util/system.h>

#ifdef WIN32
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <shellapi.h>
#include <shlobj.h>
#include <shlwapi.h>
#endif

#include <QAbstractItemView>
#include <QApplication>
#include <QClipboard>
#include <QDateTime>
#include <QDesktopServices>
#include <QDoubleValidator>
#include <QFileDialog>
#include <QFont>
#include <QFontDatabase>
#include <QFontMetrics>
#include <QGuiApplication>
#include <QJsonObject>
#include <QKeyEvent>
#include <QLatin1String>
#include <QLineEdit>
#include <QList>
#include <QLocale>
#include <QMenu>
#include <QMouseEvent>
#include <QPluginLoader>
#include <QProgressDialog>
#include <QScreen>
#include <QSettings>
#include <QShortcut>
#include <QSize>
#include <QString>
#include <QStringBuilder>
#include <QTextDocument> // for Qt::mightBeRichText
#include <QThread>
#include <QUrlQuery>
#include <QtGlobal>

#include <chrono>

#if defined(Q_OS_MAC)

#include <QProcess>

void ForceActivation();
#endif

namespace GUIUtil {

QString dateTimeStr(const QDateTime &date)
{
    return QLocale::system().toString(date.date(), QLocale::ShortFormat) + QString(" ") + date.toString("hh:mm");
}

QString dateTimeStr(qint64 nTime)
{
    return dateTimeStr(QDateTime::fromTime_t((qint32)nTime));
}

QFont fixedPitchFont(bool use_embedded_font)
{
    if (use_embedded_font) {
        return {"Roboto Mono"};
    }
    return QFontDatabase::systemFont(QFontDatabase::FixedFont);
}

// Just some dummy data to generate a convincing random-looking (but consistent) address
static const uint8_t dummydata[] = {0xeb,0x15,0x23,0x1d,0xfc,0xeb,0x60,0x92,0x58,0x86,0xb6,0x7d,0x06,0x52,0x99,0x92,0x59,0x15,0xae,0xb1,0x72,0xc0,0x66,0x47};

// Generate a dummy address with invalid CRC, starting with the network prefix.
static std::string DummyAddress(const CChainParams &params)
{
    std::vector<unsigned char> sourcedata = params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
    sourcedata.insert(sourcedata.end(), dummydata, dummydata + sizeof(dummydata));
    for(int i=0; i<256; ++i) { // Try every trailing byte
        std::string s = EncodeBase58(sourcedata);
        if (!IsValidDestinationString(s)) {
            return s;
        }
        sourcedata[sourcedata.size()-1] += 1;
    }
    return "";
}

void setupAddressWidget(QValidatedLineEdit *widget, QWidget *parent)
{
    parent->setFocusProxy(widget);

    widget->setFont(fixedPitchFont());
    // We don't want translators to use own addresses in translations
    // and this is the only place, where this address is supplied.
    widget->setPlaceholderText(QObject::tr("Enter a Bitcoin address (e.g. %1)").arg(
        QString::fromStdString(DummyAddress(Params()))));
    widget->setValidator(new BitcoinAddressEntryValidator(parent));
    widget->setCheckValidator(new BitcoinAddressCheckValidator(parent));
}

bool parseBitcoinURI(const QUrl &uri, SendCoinsRecipient *out)
{
    // return if URI is not valid or is no bitcoin: URI
    if(!uri.isValid() || uri.scheme() != QString("bitcoin"))
        return false;

    SendCoinsRecipient rv;
    rv.address = uri.path();
    // Trim any following forward slash which may have been added by the OS
    if (rv.address.endsWith("/")) {
        rv.address.truncate(rv.address.length() - 1);
    }
    rv.amount = 0;

    QUrlQuery uriQuery(uri);
    QList<QPair<QString, QString> > items = uriQuery.queryItems();
    for (QList<QPair<QString, QString> >::iterator i = items.begin(); i != items.end(); i++)
    {
        bool fShouldReturnFalse = false;
        if (i->first.startsWith("req-"))
        {
            i->first.remove(0, 4);
            fShouldReturnFalse = true;
        }

        if (i->first == "label")
        {
            rv.label = i->second;
            fShouldReturnFalse = false;
        }
        if (i->first == "message")
        {
            rv.message = i->second;
            fShouldReturnFalse = false;
        }
        else if (i->first == "amount")
        {
            if(!i->second.isEmpty())
            {
                if(!BitcoinUnits::parse(BitcoinUnits::BTC, i->second, &rv.amount))
                {
                    return false;
                }
            }
            fShouldReturnFalse = false;
        }

        if (fShouldReturnFalse)
            return false;
    }
    if(out)
    {
        *out = rv;
    }
    return true;
}

bool parseBitcoinURI(QString uri, SendCoinsRecipient *out)
{
    QUrl uriInstance(uri);
    return parseBitcoinURI(uriInstance, out);
}

QString formatBitcoinURI(const SendCoinsRecipient &info)
{
    bool bech_32 = info.address.startsWith(QString::fromStdString(Params().Bech32HRP() + "1"));

    QString ret = QString("bitcoin:%1").arg(bech_32 ? info.address.toUpper() : info.address);
    int paramCount = 0;

    if (info.amount)
    {
        ret += QString("?amount=%1").arg(BitcoinUnits::format(BitcoinUnits::BTC, info.amount, false, BitcoinUnits::SeparatorStyle::NEVER));
        paramCount++;
    }

    if (!info.label.isEmpty())
    {
        QString lbl(QUrl::toPercentEncoding(info.label));
        ret += QString("%1label=%2").arg(paramCount == 0 ? "?" : "&").arg(lbl);
        paramCount++;
    }

    if (!info.message.isEmpty())
    {
        QString msg(QUrl::toPercentEncoding(info.message));
        ret += QString("%1message=%2").arg(paramCount == 0 ? "?" : "&").arg(msg);
        paramCount++;
    }

    return ret;
}

bool isDust(interfaces::Node& node, const QString& address, const CAmount& amount)
{
    CTxDestination dest = DecodeDestination(address.toStdString());
    CScript script = GetScriptForDestination(dest);
    CTxOut txOut(amount, script);
    return IsDust(txOut, node.getDustRelayFee());
}

QString HtmlEscape(const QString& str, bool fMultiLine)
{
    QString escaped = str.toHtmlEscaped();
    if(fMultiLine)
    {
        escaped = escaped.replace("\n", "<br>\n");
    }
    return escaped;
}

QString HtmlEscape(const std::string& str, bool fMultiLine)
{
    return HtmlEscape(QString::fromStdString(str), fMultiLine);
}

void copyEntryData(const QAbstractItemView *view, int column, int role)
{
    if(!view || !view->selectionModel())
        return;
    QModelIndexList selection = view->selectionModel()->selectedRows(column);

    if(!selection.isEmpty())
    {
        // Copy first item
        setClipboard(selection.at(0).data(role).toString());
    }
}

QList<QModelIndex> getEntryData(const QAbstractItemView *view, int column)
{
    if(!view || !view->selectionModel())
        return QList<QModelIndex>();
    return view->selectionModel()->selectedRows(column);
}

bool hasEntryData(const QAbstractItemView *view, int column, int role)
{
    QModelIndexList selection = getEntryData(view, column);
    if (selection.isEmpty()) return false;
    return !selection.at(0).data(role).toString().isEmpty();
}

QString getDefaultDataDirectory()
{
    return boostPathToQString(GetDefaultDataDir());
}

QString getSaveFileName(QWidget *parent, const QString &caption, const QString &dir,
    const QString &filter,
    QString *selectedSuffixOut)
{
    QString selectedFilter;
    QString myDir;
    if(dir.isEmpty()) // Default to user documents location
    {
        myDir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
    }
    else
    {
        myDir = dir;
    }
    /* Directly convert path to native OS path separators */
    QString result = QDir::toNativeSeparators(QFileDialog::getSaveFileName(parent, caption, myDir, filter, &selectedFilter));

    /* Extract first suffix from filter pattern "Description (*.foo)" or "Description (*.foo *.bar ...) */
    QRegExp filter_re(".* \\(\\*\\.(.*)[ \\)]");
    QString selectedSuffix;
    if(filter_re.exactMatch(selectedFilter))
    {
        selectedSuffix = filter_re.cap(1);
    }

    /* Add suffix if needed */
    QFileInfo info(result);
    if(!result.isEmpty())
    {
        if(info.suffix().isEmpty() && !selectedSuffix.isEmpty())
        {
            /* No suffix specified, add selected suffix */
            if(!result.endsWith("."))
                result.append(".");
            result.append(selectedSuffix);
        }
    }

    /* Return selected suffix if asked to */
    if(selectedSuffixOut)
    {
        *selectedSuffixOut = selectedSuffix;
    }
    return result;
}

QString getOpenFileName(QWidget *parent, const QString &caption, const QString &dir,
    const QString &filter,
    QString *selectedSuffixOut)
{
    QString selectedFilter;
    QString myDir;
    if(dir.isEmpty()) // Default to user documents location
    {
        myDir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
    }
    else
    {
        myDir = dir;
    }
    /* Directly convert path to native OS path separators */
    QString result = QDir::toNativeSeparators(QFileDialog::getOpenFileName(parent, caption, myDir, filter, &selectedFilter));

    if(selectedSuffixOut)
    {
        /* Extract first suffix from filter pattern "Description (*.foo)" or "Description (*.foo *.bar ...) */
        QRegExp filter_re(".* \\(\\*\\.(.*)[ \\)]");
        QString selectedSuffix;
        if(filter_re.exactMatch(selectedFilter))
        {
            selectedSuffix = filter_re.cap(1);
        }
        *selectedSuffixOut = selectedSuffix;
    }
    return result;
}

Qt::ConnectionType blockingGUIThreadConnection()
{
    if(QThread::currentThread() != qApp->thread())
    {
        return Qt::BlockingQueuedConnection;
    }
    else
    {
        return Qt::DirectConnection;
    }
}

bool checkPoint(const QPoint &p, const QWidget *w)
{
    QWidget *atW = QApplication::widgetAt(w->mapToGlobal(p));
    if (!atW) return false;
    return atW->window() == w;
}

bool isObscured(QWidget *w)
{
    return !(checkPoint(QPoint(0, 0), w)
        && checkPoint(QPoint(w->width() - 1, 0), w)
        && checkPoint(QPoint(0, w->height() - 1), w)
        && checkPoint(QPoint(w->width() - 1, w->height() - 1), w)
        && checkPoint(QPoint(w->width() / 2, w->height() / 2), w));
}

void bringToFront(QWidget* w)
{
#ifdef Q_OS_MAC
    ForceActivation();
#endif

    if (w) {
        // activateWindow() (sometimes) helps with keyboard focus on Windows
        if (w->isMinimized()) {
            w->showNormal();
        } else {
            w->show();
        }
        w->activateWindow();
        w->raise();
    }
}

void handleCloseWindowShortcut(QWidget* w)
{
    QObject::connect(new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_W), w), &QShortcut::activated, w, &QWidget::close);
}

void openDebugLogfile()
{
    fs::path pathDebug = GetDataDir() / "debug.log";

    /* Open debug.log with the associated application */
    if (fs::exists(pathDebug))
        QDesktopServices::openUrl(QUrl::fromLocalFile(boostPathToQString(pathDebug)));
}

bool openBitcoinConf()
{
    fs::path pathConfig = GetConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME));

    /* Create the file */
    fsbridge::ofstream configFile(pathConfig, std::ios_base::app);

    if (!configFile.good())
        return false;

    configFile.close();

    /* Open bitcoin.conf with the associated application */
    bool res = QDesktopServices::openUrl(QUrl::fromLocalFile(boostPathToQString(pathConfig)));
#ifdef Q_OS_MAC
    // Workaround for macOS-specific behavior; see #15409.
    if (!res) {
        res = QProcess::startDetached("/usr/bin/open", QStringList{"-t", boostPathToQString(pathConfig)});
    }
#endif

    return res;
}

ToolTipToRichTextFilter::ToolTipToRichTextFilter(int _size_threshold, QObject *parent) :
    QObject(parent),
    size_threshold(_size_threshold)
{

}

bool ToolTipToRichTextFilter::eventFilter(QObject *obj, QEvent *evt)
{
    if(evt->type() == QEvent::ToolTipChange)
    {
        QWidget *widget = static_cast<QWidget*>(obj);
        QString tooltip = widget->toolTip();
        if(tooltip.size() > size_threshold && !tooltip.startsWith("<qt") && !Qt::mightBeRichText(tooltip))
        {
            // Envelop with <qt></qt> to make sure Qt detects this as rich text
            // Escape the current message as HTML and replace \n by <br>
            tooltip = "<qt>" + HtmlEscape(tooltip, true) + "</qt>";
            widget->setToolTip(tooltip);
            return true;
        }
    }
    return QObject::eventFilter(obj, evt);
}

LabelOutOfFocusEventFilter::LabelOutOfFocusEventFilter(QObject* parent)
    : QObject(parent)
{
}

bool LabelOutOfFocusEventFilter::eventFilter(QObject* watched, QEvent* event)
{
    if (event->type() == QEvent::FocusOut) {
        auto focus_out = static_cast<QFocusEvent*>(event);
        if (focus_out->reason() != Qt::PopupFocusReason) {
            auto label = qobject_cast<QLabel*>(watched);
            if (label) {
                auto flags = label->textInteractionFlags();
                label->setTextInteractionFlags(Qt::NoTextInteraction);
                label->setTextInteractionFlags(flags);
            }
        }
    }

    return QObject::eventFilter(watched, event);
}

#ifdef WIN32
fs::path static StartupShortcutPath()
{
    std::string chain = gArgs.GetChainName();
    if (chain == CBaseChainParams::MAIN)
        return GetSpecialFolderPath(CSIDL_STARTUP) / "Bitcoin.lnk";
    if (chain == CBaseChainParams::TESTNET) // Remove this special case when CBaseChainParams::TESTNET = "testnet4"
        return GetSpecialFolderPath(CSIDL_STARTUP) / "Bitcoin (testnet).lnk";
    return GetSpecialFolderPath(CSIDL_STARTUP) / strprintf("Bitcoin (%s).lnk", chain);
}

bool GetStartOnSystemStartup()
{
    // check for Bitcoin*.lnk
    return fs::exists(StartupShortcutPath());
}

bool SetStartOnSystemStartup(bool fAutoStart)
{
    // If the shortcut exists already, remove it for updating
    fs::remove(StartupShortcutPath());

    if (fAutoStart)
    {
        CoInitialize(nullptr);

        // Get a pointer to the IShellLink interface.
        IShellLinkW* psl = nullptr;
        HRESULT hres = CoCreateInstance(CLSID_ShellLink, nullptr,
            CLSCTX_INPROC_SERVER, IID_IShellLinkW,
            reinterpret_cast<void**>(&psl));

        if (SUCCEEDED(hres))
        {
            // Get the current executable path
            WCHAR pszExePath[MAX_PATH];
            GetModuleFileNameW(nullptr, pszExePath, ARRAYSIZE(pszExePath));

            // Start client minimized
            QString strArgs = "-min";
            // Set -testnet /-regtest options
            strArgs += QString::fromStdString(strprintf(" -chain=%s", gArgs.GetChainName()));

            // Set the path to the shortcut target
            psl->SetPath(pszExePath);
            PathRemoveFileSpecW(pszExePath);
            psl->SetWorkingDirectory(pszExePath);
            psl->SetShowCmd(SW_SHOWMINNOACTIVE);
            psl->SetArguments(strArgs.toStdWString().c_str());

            // Query IShellLink for the IPersistFile interface for
            // saving the shortcut in persistent storage.
            IPersistFile* ppf = nullptr;
            hres = psl->QueryInterface(IID_IPersistFile, reinterpret_cast<void**>(&ppf));
            if (SUCCEEDED(hres))
            {
                // Save the link by calling IPersistFile::Save.
                hres = ppf->Save(StartupShortcutPath().wstring().c_str(), TRUE);
                ppf->Release();
                psl->Release();
                CoUninitialize();
                return true;
            }
            psl->Release();
        }
        CoUninitialize();
        return false;
    }
    return true;
}
#elif defined(Q_OS_LINUX)

// Follow the Desktop Application Autostart Spec:
// https://specifications.freedesktop.org/autostart-spec/autostart-spec-latest.html

fs::path static GetAutostartDir()
{
    char* pszConfigHome = getenv("XDG_CONFIG_HOME");
    if (pszConfigHome) return fs::path(pszConfigHome) / "autostart";
    char* pszHome = getenv("HOME");
    if (pszHome) return fs::path(pszHome) / ".config" / "autostart";
    return fs::path();
}

fs::path static GetAutostartFilePath()
{
    std::string chain = gArgs.GetChainName();
    if (chain == CBaseChainParams::MAIN)
        return GetAutostartDir() / "bitcoin.desktop";
    return GetAutostartDir() / strprintf("bitcoin-%s.desktop", chain);
}

bool GetStartOnSystemStartup()
{
    fsbridge::ifstream optionFile(GetAutostartFilePath());
    if (!optionFile.good())
        return false;
    // Scan through file for "Hidden=true":
    std::string line;
    while (!optionFile.eof())
    {
        getline(optionFile, line);
        if (line.find("Hidden") != std::string::npos &&
            line.find("true") != std::string::npos)
            return false;
    }
    optionFile.close();

    return true;
}

bool SetStartOnSystemStartup(bool fAutoStart)
{
    if (!fAutoStart)
        fs::remove(GetAutostartFilePath());
    else
    {
        char pszExePath[MAX_PATH+1];
        ssize_t r = readlink("/proc/self/exe", pszExePath, sizeof(pszExePath) - 1);
        if (r == -1)
            return false;
        pszExePath[r] = '\0';

        fs::create_directories(GetAutostartDir());

        fsbridge::ofstream optionFile(GetAutostartFilePath(), std::ios_base::out | std::ios_base::trunc);
        if (!optionFile.good())
            return false;
        std::string chain = gArgs.GetChainName();
        // Write a bitcoin.desktop file to the autostart directory:
        optionFile << "[Desktop Entry]\n";
        optionFile << "Type=Application\n";
        if (chain == CBaseChainParams::MAIN)
            optionFile << "Name=Bitcoin\n";
        else
            optionFile << strprintf("Name=Bitcoin (%s)\n", chain);
        optionFile << "Exec=" << pszExePath << strprintf(" -min -chain=%s\n", chain);
        optionFile << "Terminal=false\n";
        optionFile << "Hidden=false\n";
        optionFile.close();
    }
    return true;
}

#else

bool GetStartOnSystemStartup() { return false; }
bool SetStartOnSystemStartup(bool fAutoStart) { return false; }

#endif

void setClipboard(const QString& str)
{
    QClipboard* clipboard = QApplication::clipboard();
    clipboard->setText(str, QClipboard::Clipboard);
    if (clipboard->supportsSelection()) {
        clipboard->setText(str, QClipboard::Selection);
    }
}

fs::path qstringToBoostPath(const QString &path)
{
    return fs::path(path.toStdString());
}

QString boostPathToQString(const fs::path &path)
{
    return QString::fromStdString(path.string());
}

QString NetworkToQString(Network net)
{
    switch (net) {
    case NET_UNROUTABLE: return QObject::tr("Unroutable");
    case NET_IPV4: return "IPv4";
    case NET_IPV6: return "IPv6";
    case NET_ONION: return "Onion";
    case NET_I2P: return "I2P";
    case NET_CJDNS: return "CJDNS";
    case NET_INTERNAL: return QObject::tr("Internal");
    case NET_MAX: assert(false);
    } // no default case, so the compiler can warn about missing cases
    assert(false);
}

QString ConnectionTypeToQString(ConnectionType conn_type, bool prepend_direction)
{
    QString prefix;
    if (prepend_direction) {
        prefix = (conn_type == ConnectionType::INBOUND) ? QObject::tr("Inbound") : QObject::tr("Outbound") + " ";
    }
    switch (conn_type) {
    case ConnectionType::INBOUND: return prefix;
    case ConnectionType::OUTBOUND_FULL_RELAY: return prefix + QObject::tr("Full Relay");
    case ConnectionType::BLOCK_RELAY: return prefix + QObject::tr("Block Relay");
    case ConnectionType::MANUAL: return prefix + QObject::tr("Manual");
    case ConnectionType::FEELER: return prefix + QObject::tr("Feeler");
    case ConnectionType::ADDR_FETCH: return prefix + QObject::tr("Address Fetch");
    } // no default case, so the compiler can warn about missing cases
    assert(false);
}

QString formatDurationStr(int secs)
{
    QStringList strList;
    int days = secs / 86400;
    int hours = (secs % 86400) / 3600;
    int mins = (secs % 3600) / 60;
    int seconds = secs % 60;

    if (days)
        strList.append(QObject::tr("%1 d").arg(days));
    if (hours)
        strList.append(QObject::tr("%1 h").arg(hours));
    if (mins)
        strList.append(QObject::tr("%1 m").arg(mins));
    if (seconds || (!days && !hours && !mins))
        strList.append(QObject::tr("%1 s").arg(seconds));

    return strList.join(" ");
}

QString formatServicesStr(quint64 mask)
{
    QStringList strList;

    for (const auto& flag : serviceFlagsToStr(mask)) {
        strList.append(QString::fromStdString(flag));
    }

    if (strList.size())
        return strList.join(" & ");
    else
        return QObject::tr("None");
}

QString formatPingTime(std::chrono::microseconds ping_time)
{
    return (ping_time == std::chrono::microseconds::max() || ping_time == 0us) ?
        QObject::tr("N/A") :
        QObject::tr("%1 ms").arg(QString::number((int)(count_microseconds(ping_time) / 1000), 10));
}

QString formatTimeOffset(int64_t nTimeOffset)
{
  return QObject::tr("%1 s").arg(QString::number((int)nTimeOffset, 10));
}

QString formatNiceTimeOffset(qint64 secs)
{
    // Represent time from last generated block in human readable text
    QString timeBehindText;
    const int HOUR_IN_SECONDS = 60*60;
    const int DAY_IN_SECONDS = 24*60*60;
    const int WEEK_IN_SECONDS = 7*24*60*60;
    const int YEAR_IN_SECONDS = 31556952; // Average length of year in Gregorian calendar
    if(secs < 60)
    {
        timeBehindText = QObject::tr("%n second(s)","",secs);
    }
    else if(secs < 2*HOUR_IN_SECONDS)
    {
        timeBehindText = QObject::tr("%n minute(s)","",secs/60);
    }
    else if(secs < 2*DAY_IN_SECONDS)
    {
        timeBehindText = QObject::tr("%n hour(s)","",secs/HOUR_IN_SECONDS);
    }
    else if(secs < 2*WEEK_IN_SECONDS)
    {
        timeBehindText = QObject::tr("%n day(s)","",secs/DAY_IN_SECONDS);
    }
    else if(secs < YEAR_IN_SECONDS)
    {
        timeBehindText = QObject::tr("%n week(s)","",secs/WEEK_IN_SECONDS);
    }
    else
    {
        qint64 years = secs / YEAR_IN_SECONDS;
        qint64 remainder = secs % YEAR_IN_SECONDS;
        timeBehindText = QObject::tr("%1 and %2").arg(QObject::tr("%n year(s)", "", years)).arg(QObject::tr("%n week(s)","", remainder/WEEK_IN_SECONDS));
    }
    return timeBehindText;
}

QString formatBytes(uint64_t bytes)
{
    if (bytes < 1'000)
        return QObject::tr("%1 B").arg(bytes);
    if (bytes < 1'000'000)
        return QObject::tr("%1 kB").arg(bytes / 1'000);
    if (bytes < 1'000'000'000)
        return QObject::tr("%1 MB").arg(bytes / 1'000'000);

    return QObject::tr("%1 GB").arg(bytes / 1'000'000'000);
}

qreal calculateIdealFontSize(int width, const QString& text, QFont font, qreal minPointSize, qreal font_size) {
    while(font_size >= minPointSize) {
        font.setPointSizeF(font_size);
        QFontMetrics fm(font);
        if (TextWidth(fm, text) < width) {
            break;
        }
        font_size -= 0.5;
    }
    return font_size;
}

void ClickableLabel::mouseReleaseEvent(QMouseEvent *event)
{
    Q_EMIT clicked(event->pos());
}

void ClickableProgressBar::mouseReleaseEvent(QMouseEvent *event)
{
    Q_EMIT clicked(event->pos());
}

bool ItemDelegate::eventFilter(QObject *object, QEvent *event)
{
    if (event->type() == QEvent::KeyPress) {
        if (static_cast<QKeyEvent*>(event)->key() == Qt::Key_Escape) {
            Q_EMIT keyEscapePressed();
        }
    }
    return QItemDelegate::eventFilter(object, event);
}

void PolishProgressDialog(QProgressDialog* dialog)
{
#ifdef Q_OS_MAC
    // Workaround for macOS-only Qt bug; see: QTBUG-65750, QTBUG-70357.
    const int margin = TextWidth(dialog->fontMetrics(), ("X"));
    dialog->resize(dialog->width() + 2 * margin, dialog->height());
    dialog->show();
#else
    Q_UNUSED(dialog);
#endif
}

int TextWidth(const QFontMetrics& fm, const QString& text)
{
#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
    return fm.horizontalAdvance(text);
#else
    return fm.width(text);
#endif
}

void LogQtInfo()
{
#ifdef QT_STATIC
    const std::string qt_link{"static"};
#else
    const std::string qt_link{"dynamic"};
#endif
#ifdef QT_STATICPLUGIN
    const std::string plugin_link{"static"};
#else
    const std::string plugin_link{"dynamic"};
#endif
    LogPrintf("Qt %s (%s), plugin=%s (%s)\n", qVersion(), qt_link, QGuiApplication::platformName().toStdString(), plugin_link);
    const auto static_plugins = QPluginLoader::staticPlugins();
    if (static_plugins.empty()) {
        LogPrintf("No static plugins.\n");
    } else {
        LogPrintf("Static plugins:\n");
        for (const QStaticPlugin& p : static_plugins) {
            QJsonObject meta_data = p.metaData();
            const std::string plugin_class = meta_data.take(QString("className")).toString().toStdString();
            const int plugin_version = meta_data.take(QString("version")).toInt();
            LogPrintf(" %s, version %d\n", plugin_class, plugin_version);
        }
    }

    LogPrintf("Style: %s / %s\n", QApplication::style()->objectName().toStdString(), QApplication::style()->metaObject()->className());
    LogPrintf("System: %s, %s\n", QSysInfo::prettyProductName().toStdString(), QSysInfo::buildAbi().toStdString());
    for (const QScreen* s : QGuiApplication::screens()) {
        LogPrintf("Screen: %s %dx%d, pixel ratio=%.1f\n", s->name().toStdString(), s->size().width(), s->size().height(), s->devicePixelRatio());
    }
}

void PopupMenu(QMenu* menu, const QPoint& point, QAction* at_action)
{
    // The qminimal plugin does not provide window system integration.
    if (QApplication::platformName() == "minimal") return;
    menu->popup(point, at_action);
}

QDateTime StartOfDay(const QDate& date)
{
#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
    return date.startOfDay();
#else
    return QDateTime(date);
#endif
}

bool HasPixmap(const QLabel* label)
{
#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
    return !label->pixmap(Qt::ReturnByValue).isNull();
#else
    return label->pixmap() != nullptr;
#endif
}

QImage GetImage(const QLabel* label)
{
    if (!HasPixmap(label)) {
        return QImage();
    }

#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
    return label->pixmap(Qt::ReturnByValue).toImage();
#else
    return label->pixmap()->toImage();
#endif
}

QString MakeHtmlLink(const QString& source, const QString& link)
{
    return QString(source).replace(
        link,
        QLatin1String("<a href=\"") % link % QLatin1String("\">") % link % QLatin1String("</a>"));
}

void PrintSlotException(
    const std::exception* exception,
    const QObject* sender,
    const QObject* receiver)
{
    std::string description = sender->metaObject()->className();
    description += "->";
    description += receiver->metaObject()->className();
    PrintExceptionContinue(exception, description.c_str());
}

} // namespace GUIUtil