Added an OSX-only method SystemTrayIconComponent::showDropdownMenu() and tweaked the highlighting of OSX tray icons.

modules/juce_gui_extra/misc/juce_SystemTrayIconComponent.h

@@ -84,6 +84,11 @@ public:
     void paint (Graphics&) override;
    #endif
 
+   #if JUCE_MAC
+    /** Shows a menu attached to the OSX menu bar icon. */
+    void showDropdownMenu (const PopupMenu& menu);
+   #endif
+
 private:
     //==============================================================================
     JUCE_PUBLIC_IN_DLL_BUILD (class Pimpl)

modules/juce_gui_extra/native/juce_mac_SystemTrayIcon.cpp

@@ -27,13 +27,16 @@ namespace MouseCursorHelpers
     extern NSImage* createNSImage (const Image&);
 }
 
-class SystemTrayIconComponent::Pimpl
+extern NSMenu* createNSMenu (const PopupMenu&, const String& name, int topLevelMenuId,
+                             int topLevelIndex, bool addDelegate);
+
+class SystemTrayIconComponent::Pimpl  : private Timer
 {
 public:
     Pimpl (SystemTrayIconComponent& iconComp, const Image& im)
         : owner (iconComp), statusItem (nil),
           statusIcon (MouseCursorHelpers::createNSImage (im)),
-          isHighlighted (false)
+          view (nil), isHighlighted (false)
     {
         static SystemTrayViewClass cls;
         view = [cls.createInstance() init];
@@ -104,6 +107,9 @@ public:
 
             if (isLeft || isRight)  // Only mouse up is sent by the OS, so simulate a down/up
             {
+                setHighlighted (true);
+                startTimer (150);
+
                 owner.mouseDown (MouseEvent (mouseSource, Point<float>(),
                                              eventMods.withFlags (isLeft ? ModifierKeys::leftButtonModifier
                                                                          : ModifierKeys::rightButtonModifier),
@@ -123,6 +129,17 @@ public:
         }
     }
 
+    void showMenu (const PopupMenu& menu)
+    {
+        if (NSMenu* m = createNSMenu (menu, "MenuBarItem", -2, -3, true))
+        {
+            setHighlighted (true);
+            stopTimer();
+            [statusItem popUpStatusItemMenu: m];
+            startTimer (1);
+        }
+    }
+
     SystemTrayIconComponent& owner;
     NSStatusItem* statusItem;
 
@@ -136,6 +153,12 @@ private:
         [statusIcon setSize: NSMakeSize (20.0f, 20.0f)];
     }
 
+    void timerCallback() override
+    {
+        stopTimer();
+        setHighlighted (false);
+    }
+
     struct SystemTrayViewClass : public ObjCClass<NSControl>
     {
         SystemTrayViewClass()  : ObjCClass<NSControl> ("JUCESystemTrayView_")
@@ -171,10 +194,7 @@ private:
         static void handleEventDown (id self, SEL, NSEvent* e)
         {
             if (Pimpl* const owner = getOwner (self))
-            {
-                owner->setHighlighted (! owner->isHighlighted);
                 owner->handleStatusItemAction (e);
-            }
         }
 
         static void drawRect (id self, SEL, NSRect)
@@ -244,3 +264,9 @@ void* SystemTrayIconComponent::getNativeHandle() const
 {
     return pimpl != nullptr ? pimpl->statusItem : nullptr;
 }
+
+void SystemTrayIconComponent::showDropdownMenu (const PopupMenu& menu)
+{
+    if (pimpl != nullptr)
+        pimpl->showMenu (menu);
+}