src/gui/uithememanager.h

   1 /*
   2  * Bittorrent Client using Qt and libtorrent.
   3  * Copyright (C) 2019  Prince Gupta <jagannatharjun11@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
  18  * USA.
  19  *
  20  * In addition, as a special exception, the copyright holders give permission to
  21  * link this program with the OpenSSL project's "OpenSSL" library (or with
  22  * modified versions of it that use the same license as the "OpenSSL" library),
  23  * and distribute the linked executables. You must obey the GNU General Public
  24  * License in all respects for all of the code used other than "OpenSSL".  If
  25  * you modify file(s), you may extend this exception to your version of the
  26  * file(s), but you are not obligated to do so. If you do not wish to do so,
  27  * delete this exception statement from your version.
  28  */
  29
  30 #pragma once
  31
  32 #include <QtGlobal>
  33 #include <QColor>
  34 #include <QHash>
  35 #include <QIcon>
  36 #include <QObject>
  37 #include <QString>
  38
  39 #include "base/pathfwd.h"
  40
  41 class UIThemeSource
  42 {
  43 public:
  44     virtual ~UIThemeSource() = default;
  45
  46     virtual QByteArray readStyleSheet() = 0;
  47     virtual QByteArray readConfig() = 0;
  48     virtual Path iconPath(const QString &iconId) const = 0;
  49 };
  50
  51 class UIThemeManager : public QObject
  52 {
  53     Q_OBJECT
  54     Q_DISABLE_COPY_MOVE(UIThemeManager)
  55
  56 public:
  57     static void initInstance();
  58     static void freeInstance();
  59     static UIThemeManager *instance();
  60
  61     Path getIconPath(const QString &iconId) const;
  62     QIcon getIcon(const QString &iconId, const QString &fallback = {}) const;
  63     QIcon getFlagIcon(const QString &countryIsoCode) const;
  64
  65     QColor getColor(const QString &id, const QColor &defaultColor) const;
  66
  67 #ifndef Q_OS_MACOS
  68     QIcon getSystrayIcon() const;
  69 #endif
  70
  71 private:
  72     UIThemeManager(); // singleton class
  73     Path getIconPathFromResources(const QString &iconId, const QString &fallback = {}) const;
  74     void loadColorsFromJSONConfig();
  75     void applyPalette() const;
  76     void applyStyleSheet() const;
  77
  78     static UIThemeManager *m_instance;
  79     const bool m_useCustomTheme;
  80     std::unique_ptr<UIThemeSource> m_themeSource;
  81     QHash<QString, QColor> m_colors;
  82     mutable QHash<QString, QIcon> m_iconCache;
  83     mutable QHash<QString, QIcon> m_flagCache;
  84 };