GH-903 simple theme switching and dark theme

application/themes/DarkTheme.cpp

@@ -0,0 +1,37 @@
+#include "DarkTheme.h"
+
+QString DarkTheme::id()
+{
+	return "dark";
+}
+
+QString DarkTheme::name()
+{
+	return QObject::tr("Dark");
+}
+
+QPalette DarkTheme::colorScheme()
+{
+	QPalette darkPalette;
+	darkPalette.setColor(QPalette::Window, QColor(49,54,59));
+	darkPalette.setColor(QPalette::WindowText, Qt::white);
+	darkPalette.setColor(QPalette::Base, QColor(35,38,41));
+	darkPalette.setColor(QPalette::AlternateBase, QColor(49,54,59));
+	darkPalette.setColor(QPalette::ToolTipBase, Qt::white);
+	darkPalette.setColor(QPalette::ToolTipText, Qt::white);
+	darkPalette.setColor(QPalette::Text, Qt::white);
+	darkPalette.setColor(QPalette::Button, QColor(49,54,59));
+	darkPalette.setColor(QPalette::ButtonText, Qt::white);
+	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);
+	return darkPalette;
+}
+
+
+QString DarkTheme::appStyleSheet()
+{
+	return "QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }";
+}