src/gui/uithememanager.cpp

   1 /*
   2  * Bittorrent Client using Qt and libtorrent.
   3  * Copyright (C) 2023  Vladimir Golovnev <glassez@yandex.ru>
   4  * Copyright (C) 2019, 2021  Prince Gupta <jagannatharjun11@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
  19  * USA.
  20  *
  21  * In addition, as a special exception, the copyright holders give permission to
  22  * link this program with the OpenSSL project's "OpenSSL" library (or with
  23  * modified versions of it that use the same license as the "OpenSSL" library),
  24  * and distribute the linked executables. You must obey the GNU General Public
  25  * License in all respects for all of the code used other than "OpenSSL".  If
  26  * you modify file(s), you may extend this exception to your version of the
  27  * file(s), but you are not obligated to do so. If you do not wish to do so,
  28  * delete this exception statement from your version.
  29  */
  30
  31 #include "uithememanager.h"
  32
  33 #include <QPalette>
  34 #include <QPixmapCache>
  35 #include <QResource>
  36
  37 #include "base/global.h"
  38 #include "base/logger.h"
  39 #include "base/path.h"
  40 #include "base/preferences.h"
  41 #include "uithemecommon.h"
  42
  43 namespace
  44 {
  45     bool isDarkTheme()
  46     {
  47         const QPalette palette = qApp->palette();
  48         const QColor &color = palette.color(QPalette::Active, QPalette::Base);
  49         return (color.lightness() < 127);
  50     }
  51 }
  52
  53 UIThemeManager *UIThemeManager::m_instance = nullptr;
  54
  55 void UIThemeManager::freeInstance()
  56 {
  57     delete m_instance;
  58     m_instance = nullptr;
  59 }
  60
  61 void UIThemeManager::initInstance()
  62 {
  63     if (!m_instance)
  64         m_instance = new UIThemeManager;
  65 }
  66
  67 UIThemeManager::UIThemeManager()
  68     : m_useCustomTheme {Preferences::instance()->useCustomUITheme()}
  69 #if (defined(Q_OS_UNIX) && !defined(Q_OS_MACOS))
  70     , m_useSystemIcons {Preferences::instance()->useSystemIcons()}
  71 #endif
  72 {
  73     if (m_useCustomTheme)
  74     {
  75         const Path themePath = Preferences::instance()->customUIThemePath();
  76
  77         if (themePath.hasExtension(u".qbtheme"_s))
  78         {
  79             if (QResource::registerResource(themePath.data(), u"/uitheme"_s))
  80                 m_themeSource = std::make_unique<QRCThemeSource>();
  81             else
  82                 LogMsg(tr("Failed to load UI theme from file: \"%1\"").arg(themePath.toString()), Log::WARNING);
  83         }
  84         else if (themePath.filename() == CONFIG_FILE_NAME)
  85         {
  86             m_themeSource = std::make_unique<FolderThemeSource>(themePath.parentPath());
  87         }
  88     }
  89
  90     if (!m_themeSource)
  91         m_themeSource = std::make_unique<DefaultThemeSource>();
  92
  93     if (m_useCustomTheme)
  94     {
  95         applyPalette();
  96         applyStyleSheet();
  97     }
  98 }
  99
 100 UIThemeManager *UIThemeManager::instance()
 101 {
 102     return m_instance;
 103 }
 104
 105 void UIThemeManager::applyStyleSheet() const
 106 {
 107     qApp->setStyleSheet(QString::fromUtf8(m_themeSource->readStyleSheet()));
 108 }
 109
 110 QIcon UIThemeManager::getIcon(const QString &iconId, [[maybe_unused]] const QString &fallback) const
 111 {
 112     const auto colorMode = isDarkTheme() ? ColorMode::Dark : ColorMode::Light;
 113     auto &icons = (colorMode == ColorMode::Dark) ? m_darkModeIcons : m_icons;
 114
 115     const auto iter = icons.find(iconId);
 116     if (iter != icons.end())
 117         return *iter;
 118
 119 #if (defined(Q_OS_UNIX) && !defined(Q_OS_MACOS))
 120     // Don't cache system icons because users might change them at run time
 121     if (m_useSystemIcons)
 122     {
 123         auto icon = QIcon::fromTheme(iconId);
 124         if (icon.isNull() || icon.availableSizes().isEmpty())
 125             icon = QIcon::fromTheme(fallback, QIcon(m_themeSource->getIconPath(iconId, colorMode).data()));
 126         return icon;
 127     }
 128 #endif
 129
 130     const QIcon icon {m_themeSource->getIconPath(iconId, colorMode).data()};
 131     icons[iconId] = icon;
 132     return icon;
 133 }
 134
 135 QIcon UIThemeManager::getFlagIcon(const QString &countryIsoCode) const
 136 {
 137     if (countryIsoCode.isEmpty())
 138         return {};
 139
 140     const QString key = countryIsoCode.toLower();
 141     const auto iter = m_flags.find(key);
 142     if (iter != m_flags.end())
 143         return *iter;
 144
 145     const QIcon icon {u":/icons/flags/" + key + u".svg"};
 146     m_flags[key] = icon;
 147     return icon;
 148 }
 149
 150 QPixmap UIThemeManager::getScaledPixmap(const QString &iconId, const int height) const
 151 {
 152     // (workaround) svg images require the use of `QIcon()` to load and scale losslessly,
 153     // otherwise other image classes will convert it to pixmap first and follow-up scaling will become lossy.
 154
 155     Q_ASSERT(height > 0);
 156
 157     const QString cacheKey = iconId + u'@' + QString::number(height);
 158
 159     QPixmap pixmap;
 160     if (!QPixmapCache::find(cacheKey, &pixmap))
 161     {
 162         pixmap = getIcon(iconId).pixmap(height);
 163         QPixmapCache::insert(cacheKey, pixmap);
 164     }
 165
 166     return pixmap;
 167 }
 168
 169 QColor UIThemeManager::getColor(const QString &id) const
 170 {
 171     const QColor color = m_themeSource->getColor(id, (isDarkTheme() ? ColorMode::Dark : ColorMode::Light));
 172     Q_ASSERT(color.isValid());
 173
 174     return color;
 175 }
 176
 177 void UIThemeManager::applyPalette() const
 178 {
 179     struct ColorDescriptor
 180     {
 181         QString id;
 182         QPalette::ColorRole colorRole;
 183         QPalette::ColorGroup colorGroup;
 184     };
 185
 186     const ColorDescriptor paletteColorDescriptors[] =
 187     {
 188         {u"Palette.Window"_s, QPalette::Window, QPalette::Normal},
 189         {u"Palette.WindowText"_s, QPalette::WindowText, QPalette::Normal},
 190         {u"Palette.Base"_s, QPalette::Base, QPalette::Normal},
 191         {u"Palette.AlternateBase"_s, QPalette::AlternateBase, QPalette::Normal},
 192         {u"Palette.Text"_s, QPalette::Text, QPalette::Normal},
 193         {u"Palette.ToolTipBase"_s, QPalette::ToolTipBase, QPalette::Normal},
 194         {u"Palette.ToolTipText"_s, QPalette::ToolTipText, QPalette::Normal},
 195         {u"Palette.BrightText"_s, QPalette::BrightText, QPalette::Normal},
 196         {u"Palette.Highlight"_s, QPalette::Highlight, QPalette::Normal},
 197         {u"Palette.HighlightedText"_s, QPalette::HighlightedText, QPalette::Normal},
 198         {u"Palette.Button"_s, QPalette::Button, QPalette::Normal},
 199         {u"Palette.ButtonText"_s, QPalette::ButtonText, QPalette::Normal},
 200         {u"Palette.Link"_s, QPalette::Link, QPalette::Normal},
 201         {u"Palette.LinkVisited"_s, QPalette::LinkVisited, QPalette::Normal},
 202         {u"Palette.Light"_s, QPalette::Light, QPalette::Normal},
 203         {u"Palette.Midlight"_s, QPalette::Midlight, QPalette::Normal},
 204         {u"Palette.Mid"_s, QPalette::Mid, QPalette::Normal},
 205         {u"Palette.Dark"_s, QPalette::Dark, QPalette::Normal},
 206         {u"Palette.Shadow"_s, QPalette::Shadow, QPalette::Normal},
 207         {u"Palette.WindowTextDisabled"_s, QPalette::WindowText, QPalette::Disabled},
 208         {u"Palette.TextDisabled"_s, QPalette::Text, QPalette::Disabled},
 209         {u"Palette.ToolTipTextDisabled"_s, QPalette::ToolTipText, QPalette::Disabled},
 210         {u"Palette.BrightTextDisabled"_s, QPalette::BrightText, QPalette::Disabled},
 211         {u"Palette.HighlightedTextDisabled"_s, QPalette::HighlightedText, QPalette::Disabled},
 212         {u"Palette.ButtonTextDisabled"_s, QPalette::ButtonText, QPalette::Disabled}
 213     };
 214
 215     QPalette palette = qApp->palette();
 216     for (const ColorDescriptor &colorDescriptor : paletteColorDescriptors)
 217     {
 218         // For backward compatibility, the palette color overrides are read from the section of the "light mode" colors
 219         const QColor newColor = m_themeSource->getColor(colorDescriptor.id, ColorMode::Light);
 220         if (newColor.isValid())
 221             palette.setColor(colorDescriptor.colorGroup, colorDescriptor.colorRole, newColor);
 222     }
 223
 224     qApp->setPalette(palette);
 225 }