Use symbolic monochrome tray icon

Author: timschneeb

README.md

@@ -488,6 +488,8 @@ The D-Bus introspection XML is available here: https://github.com/Audio4Linux/JD
 
 This project is licensed under [GPLv3](LICENSE).
 
+The project makes use of [Papirus icons](https://github.com/PapirusDevelopmentTeam/papirus-icon-theme) licensed under [GPLv3](LICENSE).
+
 ```
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
 INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 

resources/icons/jamesdsp-tray-light.svg

@@ -97,5 +97,7 @@
         <file>translations/jamesdsp_ko.qm</file>
         <file>translations/jamesdsp_nl.qm</file>
         <file>translations/jamesdsp_no.qm</file>
+        <file>icons/jamesdsp-tray.svg</file>
+        <file>icons/jamesdsp-tray-light.svg</file>
     </qresource>
 </RCC>

resources/icons/jamesdsp-tray.svg

@@ -174,6 +174,8 @@ MainWindow::MainWindow(IAudioService* audioService,
         connect(_trayIcon, &TrayIcon::changeDisableFx, this,          &MainWindow::applyConfig);
 
         _trayIcon->setTrayVisible(AppConfig::instance().get<bool>(AppConfig::TrayIconEnabled) || _startupInTraySwitch);
+
+        connect(qApp, &QApplication::paletteChanged, _trayIcon, &TrayIcon::updateTheme);
     }
 
     // Populate preset lists

resources/resources.qrc

@@ -6,7 +6,11 @@
 
 #include <QApplication>
 #include <QMenu>
+#include <QDebug>
 #include <QDir>
+#include <QStyle>
+#include <QGuiApplication>
+#include <QStyleHints>
 
 namespace MenuIO
 {
@@ -107,10 +111,37 @@ void TrayIcon::createTrayIcon()
 {
 	menuOwner = new QWidget();
 	trayIcon  = new QSystemTrayIcon(this);
-    trayIcon->setToolTip(tr("JamesDSP for Linux"));
-    trayIcon->setIcon(QIcon::fromTheme("jamesdsp-tray", QIcon(":/icons/icon.png")));
+	trayIcon->setToolTip(tr("JamesDSP for Linux"));
 
-    connect(trayIcon, &QSystemTrayIcon::activated, this, &TrayIcon::iconEventHandler);
+	updateTheme();
+
+	connect(trayIcon, &QSystemTrayIcon::activated, this, &TrayIcon::iconEventHandler);
+}
+
+void TrayIcon::updateTheme()
+{
+    // Best effort theme detection
+    bool isDark = true;
+    QString gtkTheme = QString::fromLocal8Bit(qgetenv("GTK_THEME"));
+    Log::error(gtkTheme);
+    if (gtkTheme.contains("light"))
+        isDark = false;
+    else if (gtkTheme.contains("dark"))
+        isDark = true;
+    else {
+        // Try to derive from current app palette otherwise
+        QPalette pal = QApplication::palette();
+        isDark = pal.color(QPalette::Window).lightness() < 128;
+    }
+
+    if (isDark)
+    {
+        trayIcon->setIcon(QIcon::fromTheme("jamesdsp-tray", QIcon(":/icons/jamesdsp-tray.svg")));
+    }
+    else
+    {
+        trayIcon->setIcon(QIcon::fromTheme("jamesdsp-tray", QIcon(":/icons/jamesdsp-tray-light.svg")));
+    }
 }
 
 void TrayIcon::setTrayVisible(bool visible)

src/MainWindow.cpp

@@ -26,6 +26,7 @@ class TrayIcon :
 public slots:
 	void   changedDisableFx(bool disabled);
 	void   setTrayVisible(bool visible);
+	void   updateTheme();
 
 signals:
 	void   iconActivated();