Minimize mainwindow (instead of closing) when tray icon is not supported by the OS

main/ui/src/main/java/org/cryptomator/ui/fxapp/FxApplicationComponent.java

@@ -5,8 +5,11 @@
  *******************************************************************************/
 package org.cryptomator.ui.fxapp;
 
+import dagger.BindsInstance;
 import dagger.Subcomponent;
 
+import javax.inject.Named;
+
 @FxApplicationScoped
 @Subcomponent(modules = FxApplicationModule.class)
 public interface FxApplicationComponent {
@@ -15,6 +18,9 @@ public interface FxApplicationComponent {
 
 	@Subcomponent.Builder
 	interface Builder {
+		
+		@BindsInstance
+		Builder trayMenuSupported(@Named("trayMenuSupported") boolean trayMenuSupported);
 
 		FxApplicationComponent build();
 	}

main/ui/src/main/java/org/cryptomator/ui/mainwindow/MainWindowController.java

@@ -20,15 +20,17 @@ public class MainWindowController implements FxController {
 
 	private final Stage window;
 	private final FxApplication application;
+	private final boolean minimizeToSysTray;
 	public HBox titleBar;
 	public Region resizer;
 	private double xOffset;
 	private double yOffset;
 
 	@Inject
-	public MainWindowController(@MainWindow Stage window, FxApplication application) {
+	public MainWindowController(@MainWindow Stage window, FxApplication application, @Named("trayMenuSupported") boolean minimizeToSysTray) {
 		this.window = window;
 		this.application = application;
+		this.minimizeToSysTray = minimizeToSysTray;
 	}
 
 	@FXML
@@ -51,7 +53,11 @@ public class MainWindowController implements FxController {
 
 	@FXML
 	public void close() {
-		window.close();
+		if (minimizeToSysTray) {
+			window.close();
+		} else {
+			window.setIconified(true);
+		}
 	}
 
 	@FXML

main/ui/src/main/java/org/cryptomator/ui/traymenu/FxApplicationStarter.java

@@ -24,9 +24,9 @@ public class FxApplicationStarter {
 		this.future = new CompletableFuture<>();
 	}
 
-	public synchronized FxApplication get() {
+	public synchronized FxApplication get(boolean fromTrayMenu) {
 		if (!future.isDone()) {
-			start();
+			start(fromTrayMenu);
 		}
 		try {
 			return future.get();
@@ -38,12 +38,12 @@ public class FxApplicationStarter {
 		}
 	}
 
-	private void start() {
+	private void start(boolean fromTrayMenu) {
 		LOG.debug("Starting JavaFX runtime...");
 		Platform.startup(() -> {
 			assert Platform.isFxApplicationThread();
 			LOG.debug("JavaFX Runtime started.");
-			FxApplication app = fxAppComponent.build().application();
+			FxApplication app = fxAppComponent.trayMenuSupported(fromTrayMenu).build().application();
 			app.start();
 			future.complete(app);
 		});

main/ui/src/main/java/org/cryptomator/ui/traymenu/TrayMenuComponent.java

@@ -15,11 +15,14 @@ public interface TrayMenuComponent {
 
 	TrayIconController trayIconController();
 
+	FxApplicationStarter fxAppStarter();
+
 	default void addIconToSystemTray() {
 		if (SystemTray.isSupported()) {
 			trayIconController().initializeTrayIcon();
 		} else {
-			// TODO what?
+			// show main window directly without any tray support:
+			fxAppStarter().get(false).showMainWindow();
 		}
 	}
 

main/ui/src/main/java/org/cryptomator/ui/traymenu/TrayMenuController.java

@@ -57,11 +57,11 @@ class TrayMenuController {
 	}
 
 	private void showMainWindow(ActionEvent actionEvent) {
-		fxApplicationStarter.get().showMainWindow();
+		fxApplicationStarter.get(true).showMainWindow();
 	}
 
 	private void showPreferencesWindow(EventObject actionEvent) {
-		fxApplicationStarter.get().showPreferencesWindow();
+		fxApplicationStarter.get(true).showPreferencesWindow();
 	}
 
 	private void quitApplication(ActionEvent actionEvent) {