Allow styling with QSS stylesheets

src/app/application.cpp

@@ -56,6 +56,7 @@
 #endif // Q_OS_MAC
 #include "addnewtorrentdialog.h"
 #include "gui/guiiconprovider.h"
+#include "gui/uithememanager.h"
 #include "gui/utils.h"
 #include "mainwindow.h"
 #include "shutdownconfirmdialog.h"
@@ -558,7 +559,9 @@ int Application::exec(const QStringList &params)
     }
 #endif // DISABLE_WEBUI
 #else
+    UIThemeManager::initInstance();
     m_window = new MainWindow;
+    UIThemeManager::instance()->applyStyleSheet();
 #endif // DISABLE_GUI
 
     m_running = true;
@@ -727,6 +730,7 @@ void Application::cleanup()
             shutdownBRDestroy(reinterpret_cast<HWND>(m_window->effectiveWinId()));
 #endif // Q_OS_WIN
         delete m_window;
+        UIThemeManager::freeInstance();
     }
 #endif // DISABLE_GUI
 

src/base/preferences.cpp

@@ -105,6 +105,27 @@ void Preferences::setLocale(const QString &locale)
     setValue("Preferences/General/Locale", locale);
 }
 
+bool Preferences::useCustomUITheme() const
+{
+    return value("Preferences/General/UseCustomUITheme", false).toBool()
+           && !customUIThemePath().isEmpty();
+}
+
+void Preferences::setUseCustomUITheme(const bool use)
+{
+    setValue("Preferences/General/UseCustomUITheme", use);
+}
+
+QString Preferences::customUIThemePath() const
+{
+    return value("Preferences/General/CustomUIThemePath").toString();
+}
+
+void Preferences::setCustomUIThemePath(const QString &path)
+{
+    setValue("Preferences/General/CustomUIThemePath", path);
+}
+
 bool Preferences::deleteTorrentFilesAsDefault() const
 {
     return value("Preferences/General/DeleteTorrentsFilesAsDefault", false).toBool();

src/base/preferences.h

@@ -98,6 +98,10 @@ public:
     // General options
     QString getLocale() const;
     void setLocale(const QString &locale);
+    bool useCustomUITheme() const;
+    void setUseCustomUITheme(bool use);
+    QString customUIThemePath() const;
+    void setCustomUIThemePath(const QString &path);
     bool deleteTorrentFilesAsDefault() const;
     void setDeleteTorrentFilesAsDefault(bool del);
     bool confirmOnExit() const;

src/gui/CMakeLists.txt

@@ -57,6 +57,7 @@ transferlistfilterswidget.h
 transferlistmodel.h
 transferlistsortmodel.h
 transferlistwidget.h
+uithememanager.h
 updownratiodialog.h
 utils.h
 
@@ -102,6 +103,7 @@ transferlistfilterswidget.cpp
 transferlistmodel.cpp
 transferlistsortmodel.cpp
 transferlistwidget.cpp
+uithememanager.cpp
 updownratiodialog.cpp
 utils.cpp
 

src/gui/gui.pri

@@ -62,6 +62,7 @@ HEADERS += \
     $$PWD/transferlistmodel.h \
     $$PWD/transferlistsortmodel.h \
     $$PWD/transferlistwidget.h \
+    $$PWD/uithememanager.h \
     $$PWD/updownratiodialog.h \
     $$PWD/utils.h
 
@@ -118,6 +119,7 @@ SOURCES += \
     $$PWD/transferlistmodel.cpp \
     $$PWD/transferlistsortmodel.cpp \
     $$PWD/transferlistwidget.cpp \
+    $$PWD/uithememanager.cpp \
     $$PWD/updownratiodialog.cpp \
     $$PWD/utils.cpp
 

src/gui/optionsdialog.cpp

@@ -175,6 +175,8 @@ OptionsDialog::OptionsDialog(QWidget *parent)
     // Languages supported
     initializeLanguageCombo();
 
+    initializeThemeCombo();
+
     // Load week days (scheduler)
     m_ui->comboBoxScheduleDays->addItems(translatedWeekdayNames());
 
@@ -216,6 +218,7 @@ OptionsDialog::OptionsDialog(QWidget *parent)
     // Apply button is activated when a value is changed
     // General tab
     connect(m_ui->comboI18n, qComboBoxCurrentIndexChanged, this, &ThisType::enableApplyButton);
+    connect(m_ui->comboTheme, qComboBoxCurrentIndexChanged, this, &ThisType::enableApplyButton);
     connect(m_ui->confirmDeletion, &QAbstractButton::toggled, this, &ThisType::enableApplyButton);
     connect(m_ui->checkAltRowColors, &QAbstractButton::toggled, this, &ThisType::enableApplyButton);
     connect(m_ui->checkHideZero, &QAbstractButton::toggled, this, &ThisType::enableApplyButton);
@@ -493,6 +496,38 @@ void OptionsDialog::initializeLanguageCombo()
     }
 }
 
+void OptionsDialog::initializeThemeCombo()
+{
+    m_ui->comboTheme->addItem(tr("Default"));
+    const QString customUIThemePath = Preferences::instance()->customUIThemePath();
+    if (!customUIThemePath.isEmpty())
+        m_ui->comboTheme->addItem(Utils::Fs::toNativePath(customUIThemePath));
+    m_ui->comboTheme->insertSeparator(m_ui->comboTheme->count());
+    m_ui->comboTheme->addItem(tr("Select..."));
+    m_ui->comboTheme->setCurrentIndex(Preferences::instance()->useCustomUITheme() ? 1 : 0);
+
+    connect(m_ui->comboTheme, qOverload<int>(&QComboBox::currentIndexChanged), this, [this](const int index)
+    {
+        if (index != (m_ui->comboTheme->count() - 1))
+            return;
+
+        m_uiThemeFilePath = QFileDialog::getOpenFileName(this, tr("Select qBittorrent theme file"), {}, tr("qBittorrent Theme File (*.qbtheme)"));
+        m_ui->comboTheme->blockSignals(true);
+        if (!m_uiThemeFilePath.isEmpty()) {
+            if (m_ui->comboTheme->count() == 3)
+                m_ui->comboTheme->insertItem(1, Utils::Fs::toNativePath(m_uiThemeFilePath));
+            else
+                m_ui->comboTheme->setItemText(1, Utils::Fs::toNativePath(m_uiThemeFilePath));
+            m_ui->comboTheme->setCurrentIndex(1);
+        }
+        else {
+            // don't leave "Select..." as current text
+            m_ui->comboTheme->setCurrentIndex(Preferences::instance()->useCustomUITheme() ? 1 : 0);
+        }
+        m_ui->comboTheme->blockSignals(false);
+    });
+}
+
 // Main destructor
 OptionsDialog::~OptionsDialog()
 {
@@ -563,6 +598,15 @@ void OptionsDialog::saveOptions()
 
     // General preferences
     pref->setLocale(locale);
+
+    if (!m_uiThemeFilePath.isEmpty()
+        && (m_ui->comboTheme->currentIndex() == 1)) {
+        // only change if current selection is still new m_uiThemeFilePath
+        pref->setCustomUIThemePath(m_uiThemeFilePath);
+        m_uiThemeFilePath.clear();
+    }
+    pref->setUseCustomUITheme(m_ui->comboTheme->currentIndex() == 1);
+
     pref->setConfirmTorrentDeletion(m_ui->confirmDeletion->isChecked());
     pref->setAlternatingRowColors(m_ui->checkAltRowColors->isChecked());
     pref->setHideZeroValues(m_ui->checkHideZero->isChecked());

src/gui/optionsdialog.h

@@ -117,6 +117,7 @@ private:
     void saveOptions();
     void loadOptions();
     void initializeLanguageCombo();
+    void initializeThemeCombo();
     static QString languageToLocalizedString(const QLocale &locale);
     // General options
     QString getLocale() const;
@@ -183,6 +184,7 @@ private:
     AdvancedSettings *m_advancedSettings;
     QList<QString> m_addedScanDirs;
     QList<QString> m_removedScanDirs;
+    QString m_uiThemeFilePath;
 };
 
 #endif // OPTIONSDIALOG_H

src/gui/optionsdialog.ui

@@ -130,19 +130,17 @@
             <item>
              <widget class="QGroupBox" name="UISettingsBox">
               <property name="title">
-               <string>Language</string>
+               <string>Interface</string>
               </property>
-              <layout class="QVBoxLayout" name="verticalLayout_8">
+              <layout class="QGridLayout" name="gridLayout_81">
-               <item>
+               <item row="0" column="0">
-                <layout class="QHBoxLayout">
-                 <item>
                 <widget class="QLabel" name="label_9">
                  <property name="text">
-                    <string>User Interface Language:</string>
+                  <string>Language:</string>
                  </property>
                 </widget>
                </item>
-                 <item>
+               <item row="0" column="1">
                 <widget class="QComboBox" name="comboI18n">
                  <property name="minimumSize">
                   <size>
@@ -158,7 +156,7 @@
                  </property>
                 </widget>
                </item>
-                 <item>
+               <item row="0" column="2">
                 <widget class="QLabel" name="lbl_i18n_info_2">
                  <property name="font">
                   <font>
@@ -173,20 +171,43 @@
                  </property>
                 </widget>
                </item>
-                 <item>
+               <item row="0" column="3">
-                  <spacer>
+                <spacer name="horizontalSpacer_111">
                  <property name="orientation">
                   <enum>Qt::Horizontal</enum>
                  </property>
                  <property name="sizeHint" stdset="0">
                   <size>
-                     <width>40</width>
+                   <width>200</width>
                    <height>20</height>
                   </size>
                  </property>
                 </spacer>
                </item>
-                </layout>
+               <item row="1" column="0">
+                <widget class="QLabel" name="label_15">
+                 <property name="text">
+                  <string>Theme:</string>
+                 </property>
+                </widget>
+               </item>
+               <item row="1" column="1">
+                <widget class="QComboBox" name="comboTheme"/>
+               </item>
+               <item row="1" column="2">
+                <widget class="QLabel" name="lbl_i18n_info_3">
+                 <property name="font">
+                  <font>
+                   <italic>true</italic>
+                  </font>
+                 </property>
+                 <property name="text">
+                  <string>(Requires restart)</string>
+                 </property>
+                 <property name="alignment">
+                  <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignVCenter</set>
+                 </property>
+                </widget>
                </item>
               </layout>
              </widget>

src/gui/uithememanager.cpp

@@ -0,0 +1,84 @@
+/*
+ * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2019  Prince Gupta <jagannatharjun11@gmail.com>
+ *
+ * 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) any later version.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link this program with the OpenSSL project's "OpenSSL" library (or with
+ * modified versions of it that use the same license as the "OpenSSL" library),
+ * and distribute the linked executables. You must obey the GNU General Public
+ * License in all respects for all of the code used other than "OpenSSL".  If
+ * you modify file(s), you may extend this exception to your version of the
+ * file(s), but you are not obligated to do so. If you do not wish to do so,
+ * delete this exception statement from your version.
+ */
+
+#include "uithememanager.h"
+
+#include <QApplication>
+#include <QFile>
+#include <QResource>
+
+#include "base/logger.h"
+#include "base/preferences.h"
+
+UIThemeManager *UIThemeManager::m_instance = nullptr;
+
+void UIThemeManager::freeInstance()
+{
+    if (m_instance) {
+        delete m_instance;
+        m_instance = nullptr;
+    }
+}
+
+void UIThemeManager::initInstance()
+{
+    if (!m_instance)
+        m_instance = new UIThemeManager;
+}
+
+UIThemeManager::UIThemeManager()
+{
+    const Preferences *const pref = Preferences::instance();
+    if (pref->useCustomUITheme()
+        && !QResource::registerResource(pref->customUIThemePath(), "/uitheme"))
+        LogMsg(tr("Failed to load UI theme from file: \"%1\"").arg(pref->customUIThemePath()), Log::WARNING);
+}
+
+UIThemeManager *UIThemeManager::instance()
+{
+    return m_instance;
+}
+
+void UIThemeManager::applyStyleSheet() const
+{
+    if (!Preferences::instance()->useCustomUITheme()) {
+        qApp->setStyleSheet({});
+        return;
+    }
+
+    QFile qssFile(":uitheme/stylesheet.qss");
+    if (!qssFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        qApp->setStyleSheet({});
+        LogMsg(tr("Couldn't apply theme stylesheet. stylesheet.qss couldn't be opened. Reason: %1").arg(qssFile.errorString())
+               , Log::WARNING);
+        return;
+    }
+
+    qApp->setStyleSheet(qssFile.readAll());
+}

src/gui/uithememanager.h

@@ -0,0 +1,52 @@
+/*
+ * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2019  Prince Gupta <jagannatharjun11@gmail.com>
+ *
+ * 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) any later version.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ *
+ * In addition, as a special exception, the copyright holders give permission to
+ * link this program with the OpenSSL project's "OpenSSL" library (or with
+ * modified versions of it that use the same license as the "OpenSSL" library),
+ * and distribute the linked executables. You must obey the GNU General Public
+ * License in all respects for all of the code used other than "OpenSSL".  If
+ * you modify file(s), you may extend this exception to your version of the
+ * file(s), but you are not obligated to do so. If you do not wish to do so,
+ * delete this exception statement from your version.
+ */
+
+#pragma once
+
+#include <QObject>
+
+class QString;
+
+class UIThemeManager : public QObject
+{
+    Q_OBJECT
+    Q_DISABLE_COPY(UIThemeManager)
+
+public:
+    static void initInstance();
+    static void freeInstance();
+    static UIThemeManager *instance();
+
+    void applyStyleSheet() const;
+
+private:
+    UIThemeManager(); // singleton class
+
+    static UIThemeManager *m_instance;
+};