Convert SysTray to use JPopupMenu for Unicode support

Correct Systray_zh.properties to ISO 8859-1 instead of UTF-8.

Added SysTray test to GuiTests

src/main/java/org/qora/gui/SysTray.java

@@ -1,15 +1,22 @@
 package org.qora.gui;
 
 import java.awt.AWTException;
-import java.awt.MenuItem;
-import java.awt.PopupMenu;
 import java.awt.SystemTray;
 import java.awt.TrayIcon;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowFocusListener;
 import java.net.URL;
 
+import javax.swing.JDialog;
+import javax.swing.JMenuItem;
+import javax.swing.JPopupMenu;
 import javax.swing.SwingWorker;
+import javax.swing.event.PopupMenuEvent;
+import javax.swing.event.PopupMenuListener;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -24,15 +31,47 @@ public class SysTray {
 
 	private static SysTray instance;
 	private TrayIcon trayIcon = null;
-	private PopupMenu popupMenu = null;
+	private JPopupMenu popupMenu = null;
+	/** The hidden dialog has 'focus' when menu displayed so closes the menu when user clicks elsewhere. */
+	private JDialog hiddenDialog = null;
 
 	private SysTray() {
 		if (!SystemTray.isSupported())
 			return;
 
-		this.popupMenu = createPopupMenu();
+		this.popupMenu = createJPopupMenu();
 
-		this.trayIcon = new TrayIcon(Gui.loadImage("icons/icon32.png"), "qora-core", popupMenu);
+		// Build TrayIcon without AWT PopupMenu (which doesn't support Unicode)...
+		this.trayIcon = new TrayIcon(Gui.loadImage("icons/icon32.png"), "qora-core", null);
+		// ...and attach mouse listener instead so we can use JPopupMenu (which does support Unicode)
+		this.trayIcon.addMouseListener(new MouseAdapter() {
+			@Override
+			public void mousePressed (MouseEvent me) {
+				this.maybePopupMenu(me);
+			}
+
+			@Override
+			public void mouseReleased (MouseEvent me) {
+				this.maybePopupMenu(me);
+			}
+
+			private void maybePopupMenu(MouseEvent me) {
+				if (me.isPopupTrigger()) {
+					// We destroy, then recreate, the hidden dialog to prevent taskbar entries on X11
+					if (!popupMenu.isVisible())
+						destroyHiddenDialog();
+
+					createHiddenDialog();
+					hiddenDialog.setLocation(me.getX() + 1, me.getY() - 1);
+					popupMenu.setLocation(me.getX() + 1, me.getY() - 1);
+
+					popupMenu.setInvoker(hiddenDialog);
+
+					hiddenDialog.setVisible(true);
+					popupMenu.setVisible(true);
+				}
+			}
+		});
 
 		this.trayIcon.setImageAutoSize(true);
 
@@ -43,6 +82,81 @@ public class SysTray {
 		}
 	}
 
+	private void createHiddenDialog() {
+		if (hiddenDialog != null)
+			return;
+
+		hiddenDialog = new JDialog();
+		hiddenDialog.setUndecorated(true);
+		hiddenDialog.setSize(10, 10);
+		hiddenDialog.addWindowFocusListener(new WindowFocusListener () {
+			@Override
+			public void windowLostFocus (WindowEvent we ) {
+				destroyHiddenDialog();
+			}
+
+			@Override
+			public void windowGainedFocus (WindowEvent we) {
+			}
+		});
+	}
+
+	private void destroyHiddenDialog() {
+		if (hiddenDialog == null)
+			return;
+
+		hiddenDialog.setVisible(false);
+		hiddenDialog.dispose();
+		hiddenDialog = null;
+	}
+
+	private JPopupMenu createJPopupMenu() {
+		JPopupMenu menu = new JPopupMenu();
+
+		menu.addPopupMenuListener(new PopupMenuListener() {
+			@Override
+			public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
+			}
+
+			@Override
+			public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
+				destroyHiddenDialog();
+			}
+
+			@Override
+			public void popupMenuCanceled(PopupMenuEvent e) {
+			}
+		});
+
+		JMenuItem openUi = new JMenuItem(Translator.INSTANCE.translate("SysTray", "OPEN_NODE_UI"));
+		openUi.addActionListener(new ActionListener() {
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				destroyHiddenDialog();
+
+				try {
+					URLViewer.openWebpage(new URL("http://localhost:" + Settings.getInstance().getUiPort()));
+				} catch (Exception e1) {
+					LOGGER.error("Unable to open node UI in browser");
+				}
+			}
+		});
+		menu.add(openUi);
+
+		JMenuItem exit = new JMenuItem(Translator.INSTANCE.translate("SysTray", "EXIT"));
+		exit.addActionListener(new ActionListener() {
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				destroyHiddenDialog();
+
+				new ClosingWorker().execute();
+			}
+		});
+		menu.add(exit);
+
+		return menu;
+	}
+
 	class ClosingWorker extends SwingWorker<Void, Void> {
 		@Override
 		protected Void doInBackground() {
@@ -56,32 +170,6 @@ public class SysTray {
 		}
 	}
 
-	private PopupMenu createPopupMenu() {
-		PopupMenu menu = new PopupMenu();
-
-		MenuItem openUi = new MenuItem(Translator.INSTANCE.translate("SysTray", "OPEN_NODE_UI"));
-		openUi.addActionListener(new ActionListener() {
-			public void actionPerformed(ActionEvent e) {
-				try {
-					URLViewer.openWebpage(new URL("http://localhost:" + Settings.getInstance().getUiPort()));
-				} catch (Exception e1) {
-					LOGGER.error("Unable to open node UI in browser");
-				}
-			}
-		});
-		menu.add(openUi);
-
-		MenuItem exit = new MenuItem(Translator.INSTANCE.translate("SysTray", "EXIT"));
-		exit.addActionListener(new ActionListener() {
-			public void actionPerformed(ActionEvent e) {
-				new ClosingWorker().execute();
-			}
-		});
-		menu.add(exit);
-
-		return menu;
-	}
-
 	public static SysTray getInstance() {
 		if (instance == null)
 			instance = new SysTray();