From 954663b8bb36cdc3f62f2211a8749a8d4db29317 Mon Sep 17 00:00:00 2001
From: ed <eddavies95@gmail.com>
Date: Tue, 18 Dec 2018 17:15:23 +0000
Subject: [PATCH] VST3:  Added a workaround for Cubase 10 resizing the host
 window after the plug-in on macOS

---
 .../VST3/juce_VST3_Wrapper.cpp                | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp b/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
index a3375a1b24..29049c17aa 100644
--- a/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
+++ b/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
@@ -811,6 +811,11 @@ private:
             editorScaleFactor = ec.lastScaleFactorReceived;
 
             component.reset (new ContentWrapperComponent (*this, p));
+
+           #if JUCE_MAC
+            if (getHostType().type == PluginHostType::SteinbergCubase10)
+                cubase10Workaround.reset (new Cubase10WindowResizeWorkaround (*this));
+           #endif
         }
 
         tresult PLUGIN_API queryInterface (const TUID targetIID, void** obj) override
@@ -907,6 +912,11 @@ private:
 
                     component->setSize (w, h);
 
+                   #if JUCE_MAC
+                    if (cubase10Workaround != nullptr)
+                        cubase10Workaround->triggerAsyncUpdate();
+                    else
+                   #endif
                     if (auto* peer = component->getPeer())
                         peer->updateBounds();
                 }
@@ -1211,6 +1221,23 @@ private:
        #if JUCE_MAC
         void* macHostWindow = nullptr;
         bool isNSView = false;
+
+        // On macOS Cubase 10 resizes the host window after calling onSize() resulting in the peer
+        // bounds being a step behind the plug-in. Calling updateBounds() asynchronously seems to fix things...
+        struct Cubase10WindowResizeWorkaround  : public AsyncUpdater
+        {
+            Cubase10WindowResizeWorkaround (JuceVST3Editor& o)  : owner (o) {}
+
+            void handleAsyncUpdate() override
+            {
+                if (auto* peer = owner.component->getPeer())
+                    peer->updateBounds();
+            }
+
+            JuceVST3Editor& owner;
+        };
+
+        std::unique_ptr<Cubase10WindowResizeWorkaround> cubase10Workaround;
        #endif
 
         float editorScaleFactor = 1.0f;