160 lines
3.2 KiB
C++
160 lines
3.2 KiB
C++
/*
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* This file Copyright (C) 2009-2015 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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*/
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#include "IconCache.h"
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#ifdef _WIN32
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#include <windows.h>
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#include <shellapi.h>
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#endif
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#include <QFile>
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#include <QFileIconProvider>
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#include <QFileInfo>
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#include <QIcon>
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#include <QObject>
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#ifdef _WIN32
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#include <QPixmapCache>
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#include <QtWin>
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#else
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#include <QMimeDatabase>
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#include <QMimeType>
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#endif
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#include <libtransmission/transmission.h>
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/***
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****
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***/
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IconCache& IconCache::get()
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{
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// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
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static auto& singleton = *new IconCache();
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return singleton;
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}
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IconCache::IconCache() :
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folder_icon_(QFileIconProvider().icon(QFileIconProvider::Folder)),
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file_icon_(QFileIconProvider().icon(QFileIconProvider::File))
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{
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}
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QIcon IconCache::guessMimeIcon(QString const& filename, QIcon fallback) const
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{
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QIcon icon;
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#ifdef _WIN32
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if (!filename.isEmpty())
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{
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QFileInfo const file_info(filename);
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addAssociatedFileIcon(file_info, SHGFI_SMALLICON, icon);
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addAssociatedFileIcon(file_info, 0, icon);
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addAssociatedFileIcon(file_info, SHGFI_LARGEICON, icon);
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}
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#else
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icon = getMimeIcon(filename);
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#endif
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if (icon.isNull())
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{
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icon = fallback;
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}
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return icon;
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}
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/***
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****
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***/
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#ifdef _WIN32
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void IconCache::addAssociatedFileIcon(QFileInfo const& file_info, UINT icon_size, QIcon& icon) const
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{
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QString const pixmap_cache_key = QStringLiteral("tr_file_ext_") + QString::number(icon_size) + QLatin1Char('_') +
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file_info.suffix();
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QPixmap pixmap;
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if (!QPixmapCache::find(pixmap_cache_key, &pixmap))
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{
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auto const filename = file_info.fileName().toStdWString();
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SHFILEINFO shell_file_info;
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if (::SHGetFileInfoW(filename.data(), FILE_ATTRIBUTE_NORMAL, &shell_file_info,
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sizeof(shell_file_info), SHGFI_ICON | icon_size | SHGFI_USEFILEATTRIBUTES) != 0)
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{
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if (shell_file_info.hIcon != nullptr)
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{
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pixmap = QtWin::fromHICON(shell_file_info.hIcon);
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::DestroyIcon(shell_file_info.hIcon);
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}
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}
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QPixmapCache::insert(pixmap_cache_key, pixmap);
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}
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if (!pixmap.isNull())
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{
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icon.addPixmap(pixmap);
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}
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}
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#else
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QIcon IconCache::getMimeIcon(QString const& filename) const
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{
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if (suffixes_.empty())
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{
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for (auto const& type : QMimeDatabase().allMimeTypes())
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{
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auto const tmp = type.suffixes();
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suffixes_.insert(tmp.begin(), tmp.end());
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}
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}
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auto const ext = QFileInfo(filename).suffix();
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if (suffixes_.count(ext) == 0)
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{
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return {};
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}
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QIcon& icon = icon_cache_[ext];
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if (icon.isNull()) // cache miss
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{
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QMimeDatabase mime_db;
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QMimeType type = mime_db.mimeTypeForFile(filename, QMimeDatabase::MatchExtension);
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if (icon.isNull())
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{
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icon = QIcon::fromTheme(type.iconName());
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}
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if (icon.isNull())
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{
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icon = QIcon::fromTheme(type.genericIconName());
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}
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if (icon.isNull())
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{
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icon = {};
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}
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}
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return icon;
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}
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#endif
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