util.cpp

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/

#include "util.h"
#include <QSize>
#include <QApplication>
#include <QKeyEvent>
#include <QTimer>
#include <QLabel>
#include <QPainter>
#include <QStyleOptionViewItem>
#include <QtDebug>
#include <util/sll/prelude.h>
#include <util/sll/qtutil.h>
#include "geometry.h"

namespace LC::Util
{
    namespace
    {
        class AADisplayEventFilter : public QObject
        {
            QWidget * const Display_;
        public:
            explicit AADisplayEventFilter (QWidget *display)
            : QObject (display)
            , Display_ (display)
            {
            }
        protected:
            bool eventFilter (QObject*, QEvent *event) override
            {
                bool shouldClose = false;
                switch (event->type ())
                {
                case QEvent::KeyRelease:
                    shouldClose = static_cast<QKeyEvent*> (event)->key () == Qt::Key_Escape;
                    break;
                case QEvent::MouseButtonRelease:
                    shouldClose = true;
                    break;
                default:
                    break;
                }

                if (!shouldClose)
                    return false;

                QTimer::singleShot (0,
                        Display_,
                        &QWidget::close);
                return true;
            }
        };
    }

    QLabel* ShowPixmapLabel (const QPixmap& srcPx, const QPoint& centerPos)
    {
        const auto scaleFactor = 0.9;
        const auto& availGeom = AvailableGeometry (centerPos);
        const auto& availSize = availGeom.size () * scaleFactor;

        auto px = srcPx;
        if (px.size ().width () > availSize.width () ||
            px.size ().height () > availSize.height ())
            px = px.scaled (availSize, Qt::KeepAspectRatio, Qt::SmoothTransformation);

        auto topLeftPos = centerPos - QPoint { px.size ().width (), px.size ().height () } /2;
        if (!availGeom.contains (topLeftPos))
        {
            topLeftPos.setX (std::max (topLeftPos.x (), availGeom.left ()));
            topLeftPos.setY (std::max (topLeftPos.y (), availGeom.top ()));
        }

        const auto label = new QLabel;
        label->setWindowFlags (Qt::Tool);
        label->setAttribute (Qt::WA_DeleteOnClose);
        label->setFixedSize (px.size ());
        label->setPixmap (px);
        label->show ();
        label->activateWindow ();
        label->installEventFilter (new AADisplayEventFilter (label));
        label->move (topLeftPos);
        return label;
    }

    QColor TintColors (const QColor& c1, const QColor& c2, double alpha)
    {
        QColor color;
        color.setRedF (alpha * c1.redF () + (1 - alpha) * c2.redF ());
        color.setGreenF (alpha * c1.greenF () + (1 - alpha) * c2.greenF ());
        color.setBlueF (alpha * c1.blueF () + (1 - alpha) * c2.blueF ());
        return color;
    }

    QString ElideProgressBarText (const QString& text, const QStyleOptionViewItem& option)
    {
        return option.fontMetrics.elidedText (text, Qt::ElideRight, option.rect.width ());
    }

    void TintPalette (QWidget *widget, const QColor& color, double alpha, const QList<QPalette::ColorRole>& roles)
    {
        auto palette = widget->palette ();
        for (auto role : roles)
            palette.setColor (role, TintColors (palette.color (role), color, alpha));
        widget->setPalette (palette);
    }

    QString FormatName (const QString& name)
    {
        return "<em>" + name + "</em>";
    }

    QPixmap DrawOverlayText (QPixmap px,
            const QString& text, QFont font, const QPen& pen, const QBrush& brush)
    {
        const auto& iconSize = px.size () / px.devicePixelRatio ();

        const auto fontHeight = iconSize.height () * 0.45;
        const auto minFontHeight = 6.0;
        font.setPixelSize (static_cast<int> (std::max (minFontHeight, fontHeight)));

        const QFontMetrics fm (font);
        const auto width = fm.horizontalAdvance (text) + 2. * iconSize.width () / 10.;
        const auto height = fm.height () + 2. * iconSize.height () / 10.;
        const bool tooSmall = width > iconSize.width ();

        const QRectF textRect (iconSize.width () - width, iconSize.height () - height, width, height);

        QPainter p (&px);
        p.setBrush (brush);
        p.setFont (font);
        p.setPen (pen);
        p.setRenderHint (QPainter::Antialiasing);
        p.setRenderHint (QPainter::TextAntialiasing);
        p.drawRoundedRect (textRect, 4, 4);
        p.drawText (textRect,
                Qt::AlignCenter,
                tooSmall ? QStringLiteral ("#") : text);
        p.end ();

        return px;
    }

    // https://bugreports.qt.io/browse/QTBUG-53550
    QIcon FixupTrayIcon (const QIcon& icon)
    {
        if (!icon.availableSizes ().isEmpty ())
            return icon;

        constexpr auto pxSize = 256;
        return QIcon { icon.pixmap (pxSize, pxSize) };
    }

    namespace
    {
        QString MakeFileDialogFilterImpl (auto&& entries)
        {
            const auto toString = [] (const auto& e) { return e.Description_ + " (*." + e.Extension_ + ")"; };
            return MapAs<QList> (entries, toString).join (";;"_ql);
        }
    }

    QString MakeFileDialogFilter (std::initializer_list<FileDialogFilterEntry> entries)
    {
        return MakeFileDialogFilterImpl (entries);
    }

    QString MakeFileDialogFilter (const QList<FileDialogFilterEntry>& entries)
    {
        return MakeFileDialogFilterImpl (entries);
    }
}