title: How to receive touch-hold-drag event in Unreal Engine 4 Mobile Game Development C++
body: <p>I'm a UE4 newbie and am starting to make my very first mobile game with this engine. </p>
  
  <p>I'm really having trouble with implementing the event as described in the title. Basically, there are a bunch of tiles on screen. All I want is when the user touches any tile and hold his finger and drag it across other tiles, all the 'touched' tiles will change color. </p>
  
  <p>What Action/Axis Mappings do I need to add in Engine-Input? I also tried using <code>TilekMesh-&gt;OnInputTouchEnter.AddDynamic(this, &amp;AMyProjectBlock::OnFingerPressedBlock);</code>, but even when I touch-hold and drag, the tiles do not seem to change color. But when I use <code>OnInputTouchBegin</code> instead, it works successfully but I don't want to singly touch and let go each tile. Any help would be greatly appreciated.</p>