From 765051e1048a0564c139fd12682ce400bc945588 Mon Sep 17 00:00:00 2001
From: Fabio Alessandrelli <fabio.alessandrelli@gmail.com>
Date: Mon, 15 Jan 2018 00:36:57 +0100
Subject: [PATCH] ViewportContainer passes input down to children viewports

---
 scene/gui/viewport_container.cpp | 28 ++++++++++++++++++++++++++++
 scene/gui/viewport_container.h   |  1 +
 2 files changed, 29 insertions(+)

diff --git a/scene/gui/viewport_container.cpp b/scene/gui/viewport_container.cpp
index af849589cf0..ac5e6020ebc 100644
--- a/scene/gui/viewport_container.cpp
+++ b/scene/gui/viewport_container.cpp
@@ -30,6 +30,7 @@
 
 #include "viewport_container.h"
 
+#include "core/engine.h"
 #include "scene/main/viewport.h"
 
 Size2 ViewportContainer::get_minimum_size() const {
@@ -139,8 +140,34 @@ void ViewportContainer::_notification(int p_what) {
 	}
 }
 
+void ViewportContainer::_input(const Ref<InputEvent> &p_event) {
+
+	if (Engine::get_singleton()->is_editor_hint())
+		return;
+
+	Transform2D xform = get_global_transform();
+
+	if (stretch) {
+		Transform2D scale_xf;
+		scale_xf.scale(Vector2(shrink, shrink));
+		xform *= scale_xf;
+	}
+
+	Ref<InputEvent> ev = p_event->xformed_by(xform.affine_inverse());
+
+	for (int i = 0; i < get_child_count(); i++) {
+
+		Viewport *c = Object::cast_to<Viewport>(get_child(i));
+		if (!c || c->is_input_disabled())
+			continue;
+
+		c->input(ev);
+	}
+}
+
 void ViewportContainer::_bind_methods() {
 
+	ClassDB::bind_method(D_METHOD("_input", "event"), &ViewportContainer::_input);
 	ClassDB::bind_method(D_METHOD("set_stretch", "enable"), &ViewportContainer::set_stretch);
 	ClassDB::bind_method(D_METHOD("is_stretch_enabled"), &ViewportContainer::is_stretch_enabled);
 
@@ -155,4 +182,5 @@ ViewportContainer::ViewportContainer() {
 
 	stretch = false;
 	shrink = 1;
+	set_process_input(true);
 }
diff --git a/scene/gui/viewport_container.h b/scene/gui/viewport_container.h
index cd8b4dd5c10..45c4cd03a1b 100644
--- a/scene/gui/viewport_container.h
+++ b/scene/gui/viewport_container.h
@@ -48,6 +48,7 @@ public:
 	void set_stretch(bool p_enable);
 	bool is_stretch_enabled() const;
 
+	void _input(const Ref<InputEvent> &p_event);
 	void set_stretch_shrink(int p_shrink);
 	int get_stretch_shrink() const;