add experimental darkmode

relate #188

config.cc

@@ -219,6 +219,7 @@ Preferences::Preferences():
   selectWordBySingleClick( false ),
   autoScrollToTargetArticle( true ),
   escKeyHidesMainWindow( false ),
+  darkMode( false ),
   alwaysOnTop ( false ),
   searchInDock ( false ),
 
@@ -869,6 +870,9 @@ Class load()
     if ( !preferences.namedItem( "escKeyHidesMainWindow" ).isNull() )
       c.preferences.escKeyHidesMainWindow = ( preferences.namedItem( "escKeyHidesMainWindow" ).toElement().text() == "1" );
 
+    if ( !preferences.namedItem( "darkMode" ).isNull() )
+      c.preferences.darkMode = ( preferences.namedItem( "darkMode" ).toElement().text() == "1" );
+
     if ( !preferences.namedItem( "zoomFactor" ).isNull() )
       c.preferences.zoomFactor = preferences.namedItem( "zoomFactor" ).toElement().text().toDouble();
 
@@ -1711,6 +1715,10 @@ void save( Class const & c )
     opt.appendChild( dd.createTextNode( c.preferences.escKeyHidesMainWindow ? "1":"0" ) );
     preferences.appendChild( opt );
 
+    opt = dd.createElement( "darkMode" );
+    opt.appendChild( dd.createTextNode( c.preferences.darkMode ? "1":"0" ) );
+    preferences.appendChild( opt );
+
     opt = dd.createElement( "zoomFactor" );
     opt.appendChild( dd.createTextNode( QString::number( c.preferences.zoomFactor ) ) );
     preferences.appendChild( opt );

config.hh

@@ -307,6 +307,7 @@ struct Preferences
   bool selectWordBySingleClick;
   bool autoScrollToTargetArticle;
   bool escKeyHidesMainWindow;
+  bool darkMode;
   bool alwaysOnTop;
 
   /// An old UI mode when tranlateLine and wordList

mainwindow.cc

@@ -834,7 +834,7 @@ MainWindow::MainWindow( Config::Class & cfg_ ):
 
   translateLine->setFocus();
 
-  applyQtStyleSheet( cfg.preferences.displayStyle, cfg.preferences.addonStyle );
+  applyQtStyleSheet( cfg.preferences.displayStyle, cfg.preferences.addonStyle, cfg.preferences.darkMode );
 
   makeScanPopup();
 
@@ -1175,8 +1175,45 @@ QPrinter & MainWindow::getPrinter()
   return *printer;
 }
 
-void MainWindow::applyQtStyleSheet( QString const & displayStyle, QString const & addonStyle )
+void MainWindow::applyQtStyleSheet( QString const & displayStyle, QString const & addonStyle, bool const & darkMode )
 {
+  if( darkMode )
+  {
+    //https://forum.qt.io/topic/101391/windows-10-dark-theme
+    #ifdef Q_OS_WIN32
+    qApp->setStyle( QStyleFactory::create( "Fusion" ) );
+    #endif
+    QPalette darkPalette;
+    QColor darkColor     = QColor( 45, 45, 45 );
+    QColor disabledColor = QColor( 127, 127, 127 );
+    darkPalette.setColor( QPalette::Window, darkColor );
+    darkPalette.setColor( QPalette::WindowText, Qt::white );
+    darkPalette.setColor( QPalette::Base, QColor( 18, 18, 18 ) );
+    darkPalette.setColor( QPalette::AlternateBase, darkColor );
+    darkPalette.setColor( QPalette::ToolTipBase, Qt::white );
+    darkPalette.setColor( QPalette::ToolTipText, Qt::white );
+    darkPalette.setColor( QPalette::Text, Qt::white );
+    darkPalette.setColor( QPalette::Disabled, QPalette::Text, disabledColor );
+    darkPalette.setColor( QPalette::Button, darkColor );
+    darkPalette.setColor( QPalette::ButtonText, Qt::white );
+    darkPalette.setColor( QPalette::Disabled, QPalette::ButtonText, disabledColor );
+    darkPalette.setColor( QPalette::BrightText, Qt::red );
+    darkPalette.setColor( QPalette::Link, QColor( 42, 130, 218 ) );
+
+    darkPalette.setColor( QPalette::Highlight, QColor( 42, 130, 218 ) );
+    darkPalette.setColor( QPalette::HighlightedText, Qt::black );
+    darkPalette.setColor( QPalette::Disabled, QPalette::HighlightedText, disabledColor );
+
+    qApp->setPalette( darkPalette );
+  }
+  else
+  {
+  #ifdef Q_OS_WIN32
+    qApp->setStyle( QStyleFactory::create( "Windows" ) );
+  #endif
+    qApp->setPalette( QPalette() );
+  }
+
   QFile builtInCssFile( ":/qt-style.css" );
   builtInCssFile.open( QFile::ReadOnly );
   QByteArray css = builtInCssFile.readAll();
@@ -1210,6 +1247,10 @@ void MainWindow::applyQtStyleSheet( QString const & displayStyle, QString const
       css += addonCss.readAll();
   }
 
+  if(darkMode){
+    css += "QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }";
+  }
+
   setStyleSheet( css );
 }
 
@@ -2237,9 +2278,9 @@ void MainWindow::editPreferences()
     bool needReload = false;
 
     // See if we need to reapply stylesheets
-    if ( cfg.preferences.displayStyle != p.displayStyle || cfg.preferences.addonStyle != p.addonStyle )
+    if ( cfg.preferences.displayStyle != p.displayStyle || cfg.preferences.addonStyle != p.addonStyle || cfg.preferences.darkMode != p.darkMode)
     {
-      applyQtStyleSheet( p.displayStyle, p.addonStyle );
+      applyQtStyleSheet( p.displayStyle, p.addonStyle, p.darkMode );
       articleMaker.setDisplayStyle( p.displayStyle, p.addonStyle );
       needReload = true;
     }

mainwindow.hh

@@ -184,7 +184,7 @@ private:
   ResourceSchemeHandler * resourceSchemeHandler;
 
   /// Applies the qt's stylesheet, given the style's name.
-  void applyQtStyleSheet( QString const & displayStyle, QString const & addonStyle );
+  void applyQtStyleSheet( QString const & displayStyle, QString const & addonStyle, bool const & darkMode );
 
   /// Creates, destroys or otherwise updates tray icon, according to the
   /// current configuration and situation.

preferences.cc

@@ -181,6 +181,7 @@ Preferences::Preferences( QWidget * parent, Config::Class & cfg_ ):
   ui.selectBySingleClick->setChecked( p.selectWordBySingleClick);
   ui.autoScrollToTargetArticle->setChecked( p.autoScrollToTargetArticle );
   ui.escKeyHidesMainWindow->setChecked( p.escKeyHidesMainWindow );
+  ui.darkMode->setChecked(p.darkMode);
 
   ui.enableMainWindowHotkey->setChecked( p.enableMainWindowHotkey );
   ui.mainWindowHotkey->setHotKey( p.mainWindowHotkey );
@@ -400,6 +401,7 @@ Config::Preferences Preferences::getPreferences()
   p.autoScrollToTargetArticle = ui.autoScrollToTargetArticle->isChecked();
   p.escKeyHidesMainWindow = ui.escKeyHidesMainWindow->isChecked();
 
+  p.darkMode = ui.darkMode->isChecked();
   p.enableMainWindowHotkey = ui.enableMainWindowHotkey->isChecked();
   p.mainWindowHotkey = ui.mainWindowHotkey->getHotKey();
   p.enableClipboardHotkey = ui.enableClipboardHotkey->isChecked();

preferences.ui

@@ -412,6 +412,13 @@ be the last ones.</string>
          </item>
         </layout>
        </item>
+       <item row="12" column="0">
+        <widget class="QCheckBox" name="darkMode">
+         <property name="text">
+          <string>dark mode</string>
+         </property>
+        </widget>
+       </item>
       </layout>
      </widget>
      <widget class="QWidget" name="tab_4">