fix macOS build (following Projucer changes made in Windows, which removed /Applications/JUCE/modules from its headers). move JUCE headers under source control, so that Windows and macOS can both build against same version of JUCE. remove AUv3 target (I think it's an iOS thing, so it will never work with this macOS fluidsynth dylib).

modules/juce_gui_basics/mouse/juce_MouseInactivityDetector.h

@@ -0,0 +1,113 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2017 - ROLI Ltd.
+
+   JUCE is an open source library subject to commercial or open-source
+   licensing.
+
+   By using JUCE, you agree to the terms of both the JUCE 5 End-User License
+   Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
+   27th April 2017).
+
+   End User License Agreement: www.juce.com/juce-5-licence
+   Privacy Policy: www.juce.com/juce-5-privacy-policy
+
+   Or: You may also use this code under the terms of the GPL v3 (see
+   www.gnu.org/licenses).
+
+   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
+   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
+   DISCLAIMED.
+
+  ==============================================================================
+*/
+
+namespace juce
+{
+
+//==============================================================================
+/**
+    This object watches for mouse-events happening within a component, and if
+    the mouse remains still for long enough, triggers an event to indicate that
+    it has become inactive.
+
+    You'd use this for situations where e.g. you want to hide the mouse-cursor
+    when the user's not actively using the mouse.
+
+    After creating an instance of this, use addListener to get callbacks when
+    the activity status changes.
+
+    @tags{GUI}
+*/
+class JUCE_API  MouseInactivityDetector  : private Timer,
+                                           private MouseListener
+{
+public:
+    /** Creates an inactivity watcher, attached to the given component.
+        The target component must not be deleted while this - it will be monitored
+        for any mouse events in it or its child components.
+    */
+    MouseInactivityDetector (Component& target);
+
+    /** Destructor. */
+    ~MouseInactivityDetector();
+
+    /** Sets the time for which the mouse must be still before the callback
+        is triggered.
+    */
+    void setDelay (int newDelayMilliseconds) noexcept;
+
+    /** Sets the number of pixels by which the cursor is allowed to drift before it is
+        considered to be actively moved.
+    */
+    void setMouseMoveTolerance (int pixelsNeededToTrigger) noexcept;
+
+    //==============================================================================
+    /** Classes should implement this to receive callbacks from a MouseInactivityDetector
+        when the mouse becomes active or inactive.
+    */
+    class Listener
+    {
+    public:
+        virtual ~Listener() {}
+
+        /** Called when the mouse is moved or clicked for the first time
+            after a period of inactivity. */
+        virtual void mouseBecameActive() = 0;
+
+        /** Called when the mouse hasn't been moved for the timeout period. */
+        virtual void mouseBecameInactive() = 0;
+    };
+
+    /** Registers a listener. */
+    void addListener (Listener* listener);
+
+    /** Removes a previously-registered listener. */
+    void removeListener (Listener* listener);
+
+private:
+    //==============================================================================
+    Component& targetComp;
+    ListenerList<Listener> listenerList;
+    Point<int> lastMousePos;
+    int delayMs = 1500, toleranceDistance = 15;
+    bool isActive = true;
+
+    void timerCallback() override;
+    void wakeUp (const MouseEvent&, bool alwaysWake);
+    void setActive (bool);
+
+    void mouseMove  (const MouseEvent& e) override   { wakeUp (e, false); }
+    void mouseEnter (const MouseEvent& e) override   { wakeUp (e, false); }
+    void mouseExit  (const MouseEvent& e) override   { wakeUp (e, false); }
+    void mouseDown  (const MouseEvent& e) override   { wakeUp (e, true); }
+    void mouseDrag  (const MouseEvent& e) override   { wakeUp (e, true); }
+    void mouseUp    (const MouseEvent& e) override   { wakeUp (e, true); }
+    void mouseWheelMove (const MouseEvent& e, const MouseWheelDetails&) override  { wakeUp (e, true); }
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MouseInactivityDetector)
+};
+
+} // namespace juce