Allow to choose Qt style

PR #21553.

.github/workflows/ci_windows.yaml

@@ -95,7 +95,7 @@ jobs:
       - name: Install Qt
         uses: jurplel/install-qt-action@v4
         with:
-          version: "6.7.0"
+          version: "6.7.3"
           archives: qtbase qtsvg qttools
           cache: true
 

src/app/main.cpp

@@ -1,6 +1,6 @@
 /*
  * Bittorrent Client using Qt and libtorrent.
- * Copyright (C) 2014-2023  Vladimir Golovnev <glassez@yandex.ru>
+ * Copyright (C) 2014-2024  Vladimir Golovnev <glassez@yandex.ru>
  * Copyright (C) 2006  Christophe Dumez <chris@qbittorrent.org>
  *
  * This program is free software; you can redistribute it and/or
@@ -58,10 +58,6 @@
 #include <QSplashScreen>
 #include <QTimer>
 
-#ifdef Q_OS_WIN
-#include <QOperatingSystemVersion>
-#endif
-
 #ifdef QBT_STATIC_QT
 #include <QtPlugin>
 Q_IMPORT_PLUGIN(QICOPlugin)
@@ -189,11 +185,6 @@ int main(int argc, char *argv[])
     // We must save it here because QApplication constructor may change it
     const bool isOneArg = (argc == 2);
 
-#if !defined(DISABLE_GUI) && defined(Q_OS_WIN)
-    if (QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows10)
-        QApplication::setStyle(u"Fusion"_s);
-#endif
-
     // `app` must be declared out of try block to allow display message box in case of exception
     std::unique_ptr<Application> app;
     try

src/base/preferences.cpp

@@ -429,6 +429,19 @@ void Preferences::setWinStartup(const bool b)
         settings.remove(profileID);
     }
 }
+
+QString Preferences::getStyle() const
+{
+    return value<QString>(u"Appearance/Style"_s);
+}
+
+void Preferences::setStyle(const QString &styleName)
+{
+    if (styleName == getStyle())
+        return;
+
+    setValue(u"Appearance/Style"_s, styleName);
+}
 #endif // Q_OS_WIN
 
 // Downloads

src/base/preferences.h

@@ -130,6 +130,8 @@ public:
 #ifdef Q_OS_WIN
     bool WinStartup() const;
     void setWinStartup(bool b);
+    QString getStyle() const;
+    void setStyle(const QString &styleName);
 #endif
 
     // Downloads

src/gui/optionsdialog.cpp

@@ -44,6 +44,10 @@
 #include <QSystemTrayIcon>
 #include <QTranslator>
 
+#ifdef Q_OS_WIN
+#include <QStyleFactory>
+#endif
+
 #include "base/bittorrent/session.h"
 #include "base/bittorrent/sharelimitaction.h"
 #include "base/exceptions.h"
@@ -236,6 +240,8 @@ void OptionsDialog::loadBehaviorTabOptions()
     initializeLanguageCombo();
     setLocale(pref->getLocale());
 
+    initializeStyleCombo();
+
     m_ui->checkUseCustomTheme->setChecked(Preferences::instance()->useCustomUITheme());
     m_ui->customThemeFilePath->setSelectedPath(Preferences::instance()->customUIThemePath());
     m_ui->customThemeFilePath->setMode(FileSystemPathEdit::Mode::FileOpen);
@@ -345,7 +351,11 @@ void OptionsDialog::loadBehaviorTabOptions()
 
     m_ui->checkBoxPerformanceWarning->setChecked(session->isPerformanceWarningEnabled());
 
-    connect(m_ui->comboI18n, qComboBoxCurrentIndexChanged, this, &ThisType::enableApplyButton);
+    connect(m_ui->comboLanguage, qComboBoxCurrentIndexChanged, this, &ThisType::enableApplyButton);
+
+#ifdef Q_OS_WIN
+    connect(m_ui->comboStyle, qComboBoxCurrentIndexChanged, this, &ThisType::enableApplyButton);
+#endif
 
 #if (defined(Q_OS_UNIX) && !defined(Q_OS_MACOS))
     connect(m_ui->checkUseSystemIcon, &QAbstractButton::toggled, this, &ThisType::enableApplyButton);
@@ -443,6 +453,10 @@ void OptionsDialog::saveBehaviorTabOptions() const
     }
     pref->setLocale(locale);
 
+#ifdef Q_OS_WIN
+    pref->setStyle(m_ui->comboStyle->currentText());
+#endif
+
 #if (defined(Q_OS_UNIX) && !defined(Q_OS_MACOS))
     pref->useSystemIcons(m_ui->checkUseSystemIcon->isChecked());
 #endif
@@ -1387,7 +1401,7 @@ void OptionsDialog::initializeLanguageCombo()
     for (const QString &langFile : langFiles)
     {
         const QString langCode = QStringView(langFile).sliced(12).chopped(3).toString(); // remove "qbittorrent_" and ".qm"
-        m_ui->comboI18n->addItem(Utils::Misc::languageToLocalizedString(langCode), langCode);
+        m_ui->comboLanguage->addItem(Utils::Misc::languageToLocalizedString(langCode), langCode);
     }
 }
 
@@ -1672,6 +1686,30 @@ bool OptionsDialog::isSplashScreenDisabled() const
     return !m_ui->checkShowSplash->isChecked();
 }
 
+void OptionsDialog::initializeStyleCombo()
+{
+#ifdef Q_OS_WIN
+    const QString prefStyleName = Preferences::instance()->getStyle();
+    const QString selectedStyleName = prefStyleName.isEmpty() ? QApplication::style()->name() : prefStyleName;
+    QStringList styleNames = QStyleFactory::keys();
+    for (qsizetype i = 1, stylesCount = styleNames.size(); i < stylesCount; ++i)
+    {
+        if (selectedStyleName.compare(styleNames.at(i), Qt::CaseInsensitive) == 0)
+        {
+            styleNames.swapItemsAt(0, i);
+            break;
+        }
+    }
+    m_ui->comboStyle->addItems(styleNames);
+#else
+    m_ui->labelStyle->hide();
+    m_ui->comboStyle->hide();
+    m_ui->UISettingsBoxLayout->removeWidget(m_ui->labelStyle);
+    m_ui->UISettingsBoxLayout->removeWidget(m_ui->comboStyle);
+    m_ui->UISettingsBoxLayout->removeItem(m_ui->spacerStyle);
+#endif
+}
+
 #ifdef Q_OS_WIN
 bool OptionsDialog::WinStartup() const
 {
@@ -1721,7 +1759,7 @@ QString OptionsDialog::getProxyPassword() const
 // Locale Settings
 QString OptionsDialog::getLocale() const
 {
-    return m_ui->comboI18n->itemData(m_ui->comboI18n->currentIndex(), Qt::UserRole).toString();
+    return m_ui->comboLanguage->itemData(m_ui->comboLanguage->currentIndex(), Qt::UserRole).toString();
 }
 
 void OptionsDialog::setLocale(const QString &localeStr)
@@ -1746,7 +1784,7 @@ void OptionsDialog::setLocale(const QString &localeStr)
             name = locale.name();
     }
     // Attempt to find exact match
-    int index = m_ui->comboI18n->findData(name, Qt::UserRole);
+    int index = m_ui->comboLanguage->findData(name, Qt::UserRole);
     if (index < 0)
     {
         //Attempt to find a language match without a country
@@ -1754,16 +1792,16 @@ void OptionsDialog::setLocale(const QString &localeStr)
         if (pos > -1)
         {
             QString lang = name.left(pos);
-            index = m_ui->comboI18n->findData(lang, Qt::UserRole);
+            index = m_ui->comboLanguage->findData(lang, Qt::UserRole);
         }
     }
     if (index < 0)
     {
         // Unrecognized, use US English
-        index = m_ui->comboI18n->findData(u"en"_s, Qt::UserRole);
+        index = m_ui->comboLanguage->findData(u"en"_s, Qt::UserRole);
         Q_ASSERT(index >= 0);
     }
-    m_ui->comboI18n->setCurrentIndex(index);
+    m_ui->comboLanguage->setCurrentIndex(index);
 }
 
 Path OptionsDialog::getTorrentExportDir() const

src/gui/optionsdialog.h

@@ -1,6 +1,6 @@
 /*
  * Bittorrent Client using Qt and libtorrent.
- * Copyright (C) 2023  Vladimir Golovnev <glassez@yandex.ru>
+ * Copyright (C) 2023-2024  Vladimir Golovnev <glassez@yandex.ru>
  * Copyright (C) 2006  Christophe Dumez <chris@qbittorrent.org>
  *
  * This program is free software; you can redistribute it and/or
@@ -143,6 +143,7 @@ private:
 
     // General options
     void initializeLanguageCombo();
+    void initializeStyleCombo();
     QString getLocale() const;
     bool isSplashScreenDisabled() const;
 #ifdef Q_OS_WIN

src/gui/optionsdialog.ui

@@ -132,9 +132,9 @@
               <property name="title">
                <string>Interface</string>
               </property>
-              <layout class="QGridLayout" name="gridLayout_81">
+              <layout class="QGridLayout" name="UISettingsBoxLayout">
                <item row="0" column="0" colspan="3">
-                <widget class="QLabel" name="label_15">
+                <widget class="QLabel" name="labelRestartRequired">
                  <property name="font">
                   <font>
                    <italic>true</italic>
@@ -146,17 +146,17 @@
                 </widget>
                </item>
                <item row="1" column="0">
-                <widget class="QLabel" name="label_9">
+                <widget class="QLabel" name="labelLanguage">
                  <property name="text">
                   <string>Language:</string>
                  </property>
                 </widget>
                </item>
                <item row="1" column="1">
-                <widget class="QComboBox" name="comboI18n"/>
+                <widget class="QComboBox" name="comboLanguage"/>
                </item>
                <item row="1" column="2">
-                <spacer name="horizontalSpacer_111">
+                <spacer name="spacerLanguage">
                  <property name="orientation">
                   <enum>Qt::Horizontal</enum>
                  </property>
@@ -168,7 +168,30 @@
                  </property>
                 </spacer>
                </item>
-               <item row="2" column="0" colspan="3">
+               <item row="2" column="0">
+                <widget class="QLabel" name="labelStyle">
+                 <property name="text">
+                  <string>Style:</string>
+                 </property>
+                </widget>
+               </item>
+               <item row="2" column="1">
+                <widget class="QComboBox" name="comboStyle"/>
+               </item>
+               <item row="2" column="2">
+                <spacer name="spacerStyle">
+                 <property name="orientation">
+                  <enum>Qt::Orientation::Horizontal</enum>
+                 </property>
+                 <property name="sizeHint" stdset="0">
+                  <size>
+                   <width>40</width>
+                   <height>20</height>
+                  </size>
+                 </property>
+                </spacer>
+               </item>
+               <item row="3" column="0" colspan="3">
                 <widget class="QGroupBox" name="checkUseCustomTheme">
                  <property name="title">
                   <string>Use custom UI Theme</string>
@@ -190,14 +213,14 @@
                  </layout>
                 </widget>
                </item>
-               <item row="3" column="0" colspan="2">
+               <item row="4" column="0" colspan="2">
                 <widget class="QCheckBox" name="checkUseSystemIcon">
                  <property name="text">
                   <string>Use icons from system theme</string>
                  </property>
                 </widget>
                </item>
-               <item row="4" column="0" colspan="2">
+               <item row="5" column="0" colspan="2">
                 <widget class="QPushButton" name="buttonCustomizeUITheme">
                  <property name="text">
                   <string>Customize UI Theme...</string>
@@ -3881,7 +3904,7 @@ Use ';' to split multiple entries. Can use wildcard '*'.</string>
  </customwidgets>
  <tabstops>
   <tabstop>tabOption</tabstop>
-  <tabstop>comboI18n</tabstop>
+  <tabstop>comboLanguage</tabstop>
   <tabstop>checkUseCustomTheme</tabstop>
   <tabstop>customThemeFilePath</tabstop>
   <tabstop>checkAddStopped</tabstop>

src/gui/uithememanager.cpp

@@ -37,6 +37,10 @@
 #include <QStyle>
 #include <QStyleHints>
 
+#ifdef Q_OS_WIN
+#include <QOperatingSystemVersion>
+#endif
+
 #include "base/global.h"
 #include "base/logger.h"
 #include "base/path.h"
@@ -80,6 +84,12 @@ UIThemeManager::UIThemeManager()
     , m_useSystemIcons {Preferences::instance()->useSystemIcons()}
 #endif
 {
+#ifdef Q_OS_WIN
+    const QString defaultStyle = (QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows10) ? u"Fusion"_s : QString();
+    if (const QString styleName = Preferences::instance()->getStyle(); !QApplication::setStyle(styleName.isEmpty() ? defaultStyle : styleName))
+        LogMsg(tr("Set app style failed. Unknown style: \"%1\"").arg(styleName), Log::WARNING);
+#endif
+
     // NOTE: Qt::QueuedConnection can be omitted as soon as support for Qt 6.5 is dropped
     connect(QApplication::styleHints(), &QStyleHints::colorSchemeChanged, this, &UIThemeManager::onColorSchemeChanged, Qt::QueuedConnection);