added button click event handler

engine/layout.cpp

@@ -6,17 +6,6 @@ Plane NodeBorder::m_plane;
 Plane NodeImage::m_plane;
 Sampler NodeImage::m_sampler;
 
-Node* Node::find(const char* ids)
-{
-    uint16_t id = const_hash(ids);
-    if (id == m_nodeID)
-        return this;
-    for (auto& c : *this)
-        if (c.m_nodeID == id)
-            return &c;
-    return nullptr;
-}
-
 kEventResult Node::on_event(Event* e)
 {
     for (auto& c : m_children)