git subrepo clone --branch=sono6good https://github.com/essej/JUCE.git deps/juce

subrepo:
  subdir:   "deps/juce"
  merged:   "b13f9084e"
upstream:
  origin:   "https://github.com/essej/JUCE.git"
  branch:   "sono6good"
  commit:   "b13f9084e"
git-subrepo:
  version:  "0.4.3"
  origin:   "https://github.com/ingydotnet/git-subrepo.git"
  commit:   "2f68596"

deps/juce/modules/juce_gui_basics/misc/juce_DropShadower.cpp

@@ -0,0 +1,220 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2020 - Raw Material Software Limited
+
+   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 6 End-User License
+   Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
+
+   End User License Agreement: www.juce.com/juce-6-licence
+   Privacy Policy: www.juce.com/juce-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
+{
+
+class DropShadower::ShadowWindow  : public Component
+{
+public:
+    ShadowWindow (Component* comp, const DropShadow& ds)
+        : target (comp), shadow (ds)
+    {
+        setVisible (true);
+        setAccessible (false);
+        setInterceptsMouseClicks (false, false);
+
+        if (comp->isOnDesktop())
+        {
+            setSize (1, 1); // to keep the OS happy by not having zero-size windows
+            addToDesktop (ComponentPeer::windowIgnoresMouseClicks
+                            | ComponentPeer::windowIsTemporary
+                            | ComponentPeer::windowIgnoresKeyPresses);
+        }
+        else if (Component* const parent = comp->getParentComponent())
+        {
+            parent->addChildComponent (this);
+        }
+    }
+
+    void paint (Graphics& g) override
+    {
+        if (Component* c = target)
+            shadow.drawForRectangle (g, getLocalArea (c, c->getLocalBounds()));
+    }
+
+    void resized() override
+    {
+        repaint();  // (needed for correct repainting)
+    }
+
+    float getDesktopScaleFactor() const override
+    {
+        if (target != nullptr)
+            return target->getDesktopScaleFactor();
+
+        return Component::getDesktopScaleFactor();
+    }
+
+private:
+    WeakReference<Component> target;
+    DropShadow shadow;
+
+    JUCE_DECLARE_NON_COPYABLE (ShadowWindow)
+};
+
+
+//==============================================================================
+DropShadower::DropShadower (const DropShadow& ds)  : shadow (ds)  {}
+
+DropShadower::~DropShadower()
+{
+    if (owner != nullptr)
+    {
+        owner->removeComponentListener (this);
+        owner = nullptr;
+    }
+
+    updateParent();
+
+    const ScopedValueSetter<bool> setter (reentrant, true);
+    shadowWindows.clear();
+}
+
+void DropShadower::setOwner (Component* componentToFollow)
+{
+    if (componentToFollow != owner)
+    {
+        if (owner != nullptr)
+            owner->removeComponentListener (this);
+
+        // (the component can't be null)
+        jassert (componentToFollow != nullptr);
+
+        owner = componentToFollow;
+        jassert (owner != nullptr);
+
+        updateParent();
+        owner->addComponentListener (this);
+
+        updateShadows();
+    }
+}
+
+void DropShadower::updateParent()
+{
+    if (Component* p = lastParentComp)
+        p->removeComponentListener (this);
+
+    lastParentComp = owner != nullptr ? owner->getParentComponent() : nullptr;
+
+    if (Component* p = lastParentComp)
+        p->addComponentListener (this);
+}
+
+void DropShadower::componentMovedOrResized (Component& c, bool /*wasMoved*/, bool /*wasResized*/)
+{
+    if (owner == &c)
+        updateShadows();
+}
+
+void DropShadower::componentBroughtToFront (Component& c)
+{
+    if (owner == &c)
+        updateShadows();
+}
+
+void DropShadower::componentChildrenChanged (Component&)
+{
+    updateShadows();
+}
+
+void DropShadower::componentParentHierarchyChanged (Component& c)
+{
+    if (owner == &c)
+    {
+        updateParent();
+        updateShadows();
+    }
+}
+
+void DropShadower::componentVisibilityChanged (Component& c)
+{
+    if (owner == &c)
+        updateShadows();
+}
+
+void DropShadower::updateShadows()
+{
+    if (reentrant)
+        return;
+
+    const ScopedValueSetter<bool> setter (reentrant, true);
+
+    if (owner == nullptr)
+    {
+        shadowWindows.clear();
+        return;
+    }
+
+    if (owner->isShowing()
+         && owner->getWidth() > 0 && owner->getHeight() > 0
+         && (Desktop::canUseSemiTransparentWindows() || owner->getParentComponent() != nullptr))
+    {
+        while (shadowWindows.size() < 4)
+            shadowWindows.add (new ShadowWindow (owner, shadow));
+
+        const int shadowEdge = jmax (shadow.offset.x, shadow.offset.y) + shadow.radius;
+        const int x = owner->getX();
+        const int y = owner->getY() - shadowEdge;
+        const int w = owner->getWidth();
+        const int h = owner->getHeight() + shadowEdge + shadowEdge;
+
+        for (int i = 4; --i >= 0;)
+        {
+            // there seem to be rare situations where the dropshadower may be deleted by
+            // callbacks during this loop, so use a weak ref to watch out for this..
+            WeakReference<Component> sw (shadowWindows[i]);
+
+            if (sw != nullptr)
+            {
+                sw->setAlwaysOnTop (owner->isAlwaysOnTop());
+
+                if (sw == nullptr)
+                    return;
+
+                switch (i)
+                {
+                    case 0: sw->setBounds (x - shadowEdge, y, shadowEdge, h); break;
+                    case 1: sw->setBounds (x + w, y, shadowEdge, h); break;
+                    case 2: sw->setBounds (x, y, w, shadowEdge); break;
+                    case 3: sw->setBounds (x, owner->getBottom(), w, shadowEdge); break;
+                    default: break;
+                }
+
+                if (sw == nullptr)
+                    return;
+
+                sw->toBehind (i == 3 ? owner.get() : shadowWindows.getUnchecked (i + 1));
+            }
+        }
+    }
+    else
+    {
+        shadowWindows.clear();
+    }
+}
+
+} // namespace juce