qabstractfileiconengine.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qabstractfileiconengine_p.h"
 
#include <qpixmapcache.h>
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
QPixmap QAbstractFileIconEngine::pixmap(const QSize &size, QIcon::Mode mode,
                                        QIcon::State state)
{
    Q_UNUSED(mode);
    Q_UNUSED(state);
 
    if (!size.isValid())
        return QPixmap();
 
    QString key = cacheKey();
    if (key.isEmpty())
        return filePixmap(size, mode, state);
 
    key += u'_' + QString::number(size.width());
 
    QPixmap result;
    if (!QPixmapCache::find(key, &result)) {
        result = filePixmap(size, mode, state);
        if (!result.isNull())
            QPixmapCache::insert(key, result);
    }
 
    return result;
}
 
QPixmap QAbstractFileIconEngine::scaledPixmap(const QSize &size, QIcon::Mode mode, QIcon::State state, qreal scale)
{
    Q_UNUSED(scale); // (size is pre-multiplied by scale)
    return pixmap(size, mode, state);
}
 
QSize QAbstractFileIconEngine::actualSize(const QSize &size, QIcon::Mode mode,
                                          QIcon::State state)
{
    const QList<QSize> &sizes = availableSizes(mode, state);
    const int numberSizes = sizes.size();
    if (numberSizes == 0)
        return QSize();
 
    // Find the smallest available size whose area is still larger than the input
    // size. Otherwise, use the largest area available size. (We don't assume the
    // platform theme sizes are sorted, hence the extra logic.)
    const int sizeArea = size.width() * size.height();
    QSize actualSize = sizes.first();
    int actualArea = actualSize.width() * actualSize.height();
    for (int i = 1; i < numberSizes; ++i) {
        const QSize &s = sizes.at(i);
        const int a = s.width() * s.height();
        if ((sizeArea <= a && a < actualArea) || (actualArea < sizeArea && actualArea < a)) {
            actualSize = s;
            actualArea = a;
        }
    }
 
    if (!actualSize.isNull() && (actualSize.width() > size.width() || actualSize.height() > size.height()))
        actualSize.scale(size, Qt::KeepAspectRatio);
 
    return actualSize;
}
 
/* Reimplement to return a cache key for the entry. An empty result indicates
 * the icon should not be cached (for example, directory icons having custom icons). */
QString QAbstractFileIconEngine::cacheKey() const
{
    if (!m_fileInfo.isFile() || m_fileInfo.isSymLink() || m_fileInfo.isExecutable())
        return QString();
 
    const QString &suffix = m_fileInfo.suffix();
    return "qt_."_L1
        + (suffix.isEmpty() ? m_fileInfo.fileName() : suffix); // handle "Makefile"                                    ;)
}
 
QT_END_NAMESPACE