title: How to deal with click events in qt3d?
body: <p>I want to do something when click or doubleclick in the scene3d. But nothing to show in my console</p>
  
  <pre><code>Scene3D {
      aspects: ["logic", "input"]
      ...
      MouseDevice { id: mouse_device }
      MouseHandler {
          sourceDevice: mouse_device
          onPressed: { ... }
          onPositionChanged: { ... }
          onWheel: { ... } 
          onClicked: { console.log("click") } // failed
          onDoubleClicked: { ... } // failed
      }
      ...
  }
  </code></pre>
  
  <p>Maybe I am missing something? Or is there another way to do it?</p>