transmission/qt/Utils.h

/*
 * This file Copyright (C) 2009-2015 Mnemosyne LLC
 *
 * It may be used under the GNU GPL versions 2 or 3
 * or any future license endorsed by Mnemosyne LLC.
 *
 */

#pragma once

#include <cctype> // isxdigit()
#include <functional>

#include <QHash>
#include <QPointer>
#include <QRect>
#include <QString>

class QAbstractItemView;
class QColor;
class QHeaderView;
class QIcon;
class QModelIndex;

#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)

namespace std
{

template<>
struct hash<QString>
{
    std::size_t operator()(QString const& s) const
    {
        return qHash(s);
    }
};

} // namespace std

#endif

class Utils
{
public:
    static QIcon getIconFromIndex(QModelIndex const& index);

    static QString removeTrailingDirSeparator(QString const& path);

    static void narrowRect(QRect& rect, int dx1, int dx2, Qt::LayoutDirection direction)
    {
        if (direction == Qt::RightToLeft)
        {
            qSwap(dx1, dx2);
        }

        rect.adjust(dx1, 0, -dx2, 0);
    }

    static int measureViewItem(QAbstractItemView const* view, QString const& text);
    static int measureHeaderItem(QHeaderView const* view, QString const& text);

    static QColor getFadedColor(QColor const& color);

    template<typename DialogT, typename... ArgsT>
    static void openDialog(QPointer<DialogT>& dialog, ArgsT&&... args)
    {
        if (dialog.isNull())
        {
            dialog = new DialogT(std::forward<ArgsT>(args)...);
            dialog->setAttribute(Qt::WA_DeleteOnClose);
            dialog->show();
        }
        else
        {
            dialog->raise();
            dialog->activateWindow();
        }
    }

    ///
    /// URLs
    ///

    static bool isMagnetLink(QString const& s)
    {
        return s.startsWith(QStringLiteral("magnet:?"));
    }

    static bool isHexHashcode(QString const& s)
    {
        if (s.length() != 40)
        {
            return false;
        }

        for (auto const& ch : s)
        {
            if (!isxdigit(ch.unicode()))
            {
                return false;
            }
        }

        return true;
    }

    static bool isUriWithSupportedScheme(QString const& s)
    {
        return s.startsWith(QStringLiteral("ftp://")) || s.startsWith(QStringLiteral("http://")) ||
            s.startsWith(QStringLiteral("https://"));
    }
};