Now PaintNodes can handle input events coming from the editor plugin.

modules/paint/nodes/paint_node.cpp

@@ -34,6 +34,13 @@ Color PaintNode::util_random_color_alt() {
 	return PaintUtilities::random_color_alt();
 }
 
+bool PaintNode::forward_canvas_gui_input(const Ref<InputEvent> &p_event) {
+	return call("_forward_canvas_gui_input", p_event);
+}
+bool PaintNode::_forward_canvas_gui_input(const Ref<InputEvent> &p_event) {
+	return false;
+}
+
 PaintProject *PaintNode::get_paint_project() {
 	PaintNode *p = this;
 
@@ -87,5 +94,9 @@ void PaintNode::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("util_random_color"), &PaintNode::util_random_color);
 	ClassDB::bind_method(D_METHOD("util_random_color_alt"), &PaintNode::util_random_color_alt);
 
+	BIND_VMETHOD(MethodInfo(Variant::BOOL, "_forward_canvas_gui_input", PropertyInfo(Variant::OBJECT, "event", PROPERTY_HINT_RESOURCE_TYPE, "InputEvent")));
+	ClassDB::bind_method(D_METHOD("forward_canvas_gui_input", "event"), &PaintNode::forward_canvas_gui_input);
+	ClassDB::bind_method(D_METHOD("_forward_canvas_gui_input", "event"), &PaintNode::_forward_canvas_gui_input);
+
 	ClassDB::bind_method(D_METHOD("get_paint_project"), &PaintNode::get_paint_project);
 }

modules/paint/nodes/paint_node.h

@@ -24,6 +24,9 @@ public:
 	Color util_random_color();
 	Color util_random_color_alt();
 
+	bool forward_canvas_gui_input(const Ref<InputEvent> &p_event);
+	bool _forward_canvas_gui_input(const Ref<InputEvent> &p_event);
+
 	PaintProject *get_paint_project();
 
 	String get_configuration_warning() const;

modules/paint/paint_editor_plugin.cpp

@@ -44,7 +44,9 @@ String PaintEditorPlugin::get_name() const {
 }
 
 void PaintEditorPlugin::edit(Object *p_object) {
-	_sidebar->on_paint_node_selected(Object::cast_to<PaintNode>(p_object));
+	_active_node = Object::cast_to<PaintNode>(p_object);
+
+	_sidebar->on_paint_node_selected(_active_node);
 }
 bool PaintEditorPlugin::handles(Object *p_object) const {
 	return p_object->is_class("PaintNode");
@@ -53,7 +55,16 @@ void PaintEditorPlugin::edited_scene_changed() {
 }
 
 bool PaintEditorPlugin::forward_canvas_gui_input(const Ref<InputEvent> &p_event) {
-	return false;
+	if (!_active_node) {
+		return false;
+	}
+
+	if (!ObjectDB::instance_validate(_active_node)) {
+		_active_node = NULL;
+		return false;
+	}
+
+	return _active_node->forward_canvas_gui_input(p_event);
 }
 void PaintEditorPlugin::forward_canvas_draw_over_viewport(Control *p_overlay) {
 }
@@ -61,6 +72,8 @@ void PaintEditorPlugin::forward_canvas_force_draw_over_viewport(Control *p_overl
 }
 
 PaintEditorPlugin::PaintEditorPlugin(EditorNode *p_node) {
+	_active_node = NULL;
+
 	editor = p_node;
 
 	EDITOR_DEF("editors/paint/editor_side", 0);
@@ -88,6 +101,12 @@ PaintEditorPlugin::~PaintEditorPlugin() {
 	Engine::get_singleton()->remove_global("PaintEditorPlugin");
 }
 
+void PaintEditorPlugin::on_node_removed(Node *node) {
+	if (_active_node == node) {
+		_active_node = NULL;
+	}
+}
+
 void PaintEditorPlugin::_notification(int p_what) {
 	if (p_what == EditorSettings::NOTIFICATION_EDITOR_SETTINGS_CHANGED) {
 		switch ((int)EditorSettings::get_singleton()->get("editors/paint/editor_side")) {
@@ -98,9 +117,14 @@ void PaintEditorPlugin::_notification(int p_what) {
 				CanvasItemEditor::get_singleton()->move_control_to_right_panel(_sidebar);
 			} break;
 		}
+	} else if (p_what == NOTIFICATION_READY) {
+		if (!get_tree()->is_connected("node_removed", this, "on_node_removed")) {
+			get_tree()->connect("node_removed", this, "on_node_removed");
+		}
 	}
 }
 
 void PaintEditorPlugin::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_sidebar"), &PaintEditorPlugin::get_sidebar);
+	ClassDB::bind_method(D_METHOD("on_node_removed", "node"), &PaintEditorPlugin::on_node_removed);
 }

modules/paint/paint_editor_plugin.h

@@ -29,6 +29,7 @@ SOFTWARE.
 class PaintWindow;
 class Texture;
 class PaintSidebar;
+class PaintNode;
 
 class PaintEditorPlugin : public EditorPlugin {
 	GDCLASS(PaintEditorPlugin, EditorPlugin);
@@ -53,11 +54,14 @@ public:
 	EditorNode *editor;
 
 protected:
+	void on_node_removed(Node *node);
+
 	void _notification(int p_what);
 
 	static void _bind_methods();
 
 	PaintSidebar *_sidebar;
+	PaintNode *_active_node;
 };
 
 #endif