File indexing completed on 2024-11-24 04:53:27

 /* Copyright (C) 2006 - 2015 Jan Kundrát <jkt@kde.org>
    Copyright (C) 2016 Luís Pereira <luis.artur.pereira@gmail.com>
 
    This file is part of the Trojita Qt IMAP e-mail client,
    http://trojita.flaska.net/
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of
    the License or (at your option) version 3 or any later version
    accepted by the membership of KDE e.V. (or its successor approved
    by the membership of KDE e.V.), which shall act as a proxy
    defined in Section 14 of version 3 of the license.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include "IconLoader.h"
 #include <QCoreApplication>
 #include <QFileInfo>
 #include <QHash>
 
 namespace UiUtils {
 
 static void cleanup_icon_cache();
 namespace {
     struct Cache : public QHash<QString, QIcon>
     {
         Cache()
         {
             qAddPostRoutine(cleanup_icon_cache);
         }
     };
 }
 
 Q_GLOBAL_STATIC(Cache, iconDict)
 
 static void cleanup_icon_cache()
 {
     iconDict()->clear();
 }
 
 
 /** @short Wrapper around the QIcon::fromTheme with sane fallback
  *
  * The issue with the QIcon::fromTheme is that it does not really work on non-X11
  * platforms, unless you ship your own theme index and specify your theme name.
  * In Trojitá, we do not really want to hardcode anything, because the
  * preference is to use whatever is available from the current theme, but *also*
  * provide an icon as a fallback. And that is exactly why this function is here.
  * */
 QIcon loadIcon(const QString &name)
 {
     auto it = iconDict()->constFind(name);
     if (it != iconDict()->constEnd())
         return *it;
 
     auto overrideIcon = QStringLiteral(":/icons/%1/%2.svg").arg(QIcon::themeName(), name);
     if (QFileInfo(overrideIcon).exists()) {
         QIcon icon(overrideIcon);
         iconDict()->insert(name, icon);
         return icon;
     }
 
     // A QIcon(QString) constructor creates non-null QIcons, even though the resulting icon will
     // not ever return a valid and usable pixmap. This means that we have to actually look at the
     // icon's pixmap to find out what to return.
     // If we do not do that, the GUI shows empty pixmaps instead of a text fallback, which is
     // clearly suboptimal.
     QIcon res = QIcon::fromTheme(name, QIcon(QStringLiteral(":/icons/%1").arg(name)));
     if (res.pixmap(QSize(16, 16)).isNull()) {
         res = QIcon();
     }
     iconDict()->insert(name, res);
     return res;
 }
 
 }