style selector

Unfortunately Qt developers removed some old native skins from support, only 3 skins are supported on Linux.
Number of native skins depends on OS and Qt built system.

src/misc/settings.cpp

@@ -137,6 +137,7 @@ void Settings::load()
         timestampFormat = s.value("timestampFormat", "hh:mm").toString();
         minimizeOnClose = s.value("minimizeOnClose", false).toBool();
         useNativeStyle = s.value("nativeStyle", false).toBool();
+        style = s.value("style", "None").toString();
     s.endGroup();
 
     s.beginGroup("State");
@@ -243,6 +244,7 @@ void Settings::save(QString path)
         s.setValue("timestampFormat", timestampFormat);
         s.setValue("minimizeOnClose", minimizeOnClose);
         s.setValue("nativeStyle", useNativeStyle);
+        s.setValue("style",style);
     s.endGroup();
 
     s.beginGroup("State");
@@ -360,6 +362,16 @@ bool Settings::getAutostartInTray() const
     return autostartInTray;
 }
 
+QString Settings::getStyle() const
+{
+    return style;
+}
+
+void Settings::setStyle(const QString& newStyle) 
+{
+    style = newStyle;
+}
+
 void Settings::setAutostartInTray(bool newValue)
 {
     autostartInTray = newValue;

src/misc/settings.h

@@ -51,6 +51,9 @@ public:
 
     bool getAutostartInTray() const;
     void setAutostartInTray(bool newValue);
+    
+    QString getStyle() const;
+    void setStyle(const QString& newValue);
 
     QString getCurrentProfile() const;
     void setCurrentProfile(QString profile);
@@ -202,7 +205,8 @@ private:
     QByteArray windowGeometry;
     QByteArray windowState;
     QByteArray splitterState;
-
+    QString style;
+    
     // ChatView
     int firstColumnHandlePos;
     int secondColumnHandlePosFromRight;

src/widget/form/settings/generalform.cpp

@@ -21,6 +21,7 @@
 #include "src/misc/settings.h"
 #include "src/misc/smileypack.h"
 #include <QMessageBox>
+#include <QStyleFactory>
 
 GeneralForm::GeneralForm() :
     GenericForm(tr("General Settings"), QPixmap(":/img/settings/general.png"))
@@ -39,7 +40,14 @@ GeneralForm::GeneralForm() :
     }
     bodyUI->smileyPackBrowser->setCurrentIndex(bodyUI->smileyPackBrowser->findData(Settings::getInstance().getSmileyPack()));
     reloadSmiles();
-
+   
+    bodyUI->styleBrowser->addItems(QStyleFactory::keys());
+    bodyUI->styleBrowser->addItem("None");
+    if(QStyleFactory::keys().contains(Settings::getInstance().getStyle()))
+        bodyUI->styleBrowser->setCurrentText(Settings::getInstance().getStyle());
+    else
+        bodyUI->styleBrowser->setCurrentText("None");
+    
     bodyUI->cbUDPDisabled->setChecked(Settings::getInstance().getForceTCP());
     bodyUI->proxyAddr->setText(Settings::getInstance().getProxyAddr());
     int port = Settings::getInstance().getProxyPort();
@@ -59,6 +67,7 @@ GeneralForm::GeneralForm() :
     connect(bodyUI->proxyAddr, &QLineEdit::editingFinished, this, &GeneralForm::onProxyAddrEdited);
     connect(bodyUI->proxyPort, SIGNAL(valueChanged(int)), this, SLOT(onProxyPortEdited(int)));
     connect(bodyUI->cbUseProxy, &QCheckBox::stateChanged, this, &GeneralForm::onUseProxyUpdated);
+    connect(bodyUI->styleBrowser, SIGNAL(currentTextChanged(QString)), this, SLOT(onStyleSelected(QString)));
 }
 
 GeneralForm::~GeneralForm()
@@ -86,6 +95,12 @@ void GeneralForm::onSetAutostartInTray()
     Settings::getInstance().setAutostartInTray(bodyUI->startInTray->isChecked());
 }
 
+void GeneralForm::onStyleSelected(QString style)
+{
+    Settings::getInstance().setStyle(style);
+    this->setStyle(QStyleFactory::create(style));
+}
+
 void GeneralForm::onSmileyBrowserIndexChanged(int index)
 {
     QString filename = bodyUI->smileyPackBrowser->itemData(index).toString();

src/widget/form/settings/generalform.h

@@ -42,6 +42,7 @@ private slots:
     void onProxyAddrEdited();
     void onProxyPortEdited(int port);
     void onUseProxyUpdated();
+    void onStyleSelected(QString style);    
 
 private:
     Ui::GeneralSettings *bodyUI;

src/widget/form/settings/generalsettings.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>527</width>
-    <height>421</height>
+    <height>397</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -126,6 +126,16 @@
         </item>
        </layout>
       </item>
+      <item>
+       <widget class="QLabel" name="styleLabel">
+        <property name="text">
+         <string>Style</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QComboBox" name="styleBrowser"/>
+      </item>
      </layout>
     </widget>
    </item>

src/widget/widget.cpp

@@ -44,6 +44,7 @@
 #include <QInputDialog>
 #include <QTimer>
 #include <tox/tox.h>
+#include <QStyleFactory>
 
 Widget *Widget::instance{nullptr};
 
@@ -75,7 +76,16 @@ Widget::Widget(QWidget *parent)
     ui->mainHead->setLayout(new QVBoxLayout());
     ui->mainHead->layout()->setMargin(0);
     ui->mainHead->layout()->setSpacing(0);
-    ui->mainHead->setStyleSheet(Style::getStylesheet(":ui/settings/mainHead.css"));
+    
+
+    if(QStyleFactory::keys().contains(Settings::getInstance().getStyle())
+            && Settings::getInstance().getStyle() != "None")
+    {
+        ui->mainHead->setStyle(QStyleFactory::create(Settings::getInstance().getStyle()));
+        ui->mainContent->setStyle(QStyleFactory::create(Settings::getInstance().getStyle()));
+    }
+    
+    ui->mainHead->setStyleSheet(Style::getStylesheet(":ui/settings/mainHead.css"));    
     ui->mainContent->setStyleSheet(Style::getStylesheet(":ui/settings/mainContent.css"));
 
     contactListWidget = new FriendListWidget();

ui/settings/mainContent.css

@@ -11,7 +11,11 @@ QLabel
 QGroupBox::title
 {
     color: black;
-    background-color: white;
+}
+
+QGroupBox
+{
+    background-color: white;    
 }
 
 QWidget