title: Move items with ng2-dragula from special place
body: <p>I have an angular 4 application with the librairie <a href="https://github.com/valor-software/ng2-dragula" rel="nofollow noreferrer">ng2-dragula</a>. I want to drag and drop some items but just if we take the item from a special place (with an icon) and not from anywhere on the item.</p>
  
  <p>This is my code is my ts file:</p>
  
  <pre><code>constructor(private dragulaService: DragulaService) {
      dragulaService.drop.subscribe((value) =&gt; {
          this.onDrop(value);
      });
  }
  </code></pre>
  
  <p>And my html file :</p>
  
  <pre><code>&lt;tbody [dragula]='"other-bag"' [dragulaModel]='commands'&gt;
      ...
  &lt;/tbody&gt;
  </code></pre>
  
  <p>So, I have something like this picture but I want to allow the move just if we take the item from the 2 vertical bars.</p>
  
  <p><a href="https://i.stack.imgur.com/XP7Ef.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XP7Ef.png" alt="enter image description here"></a></p>
  
  <p>Do you know how I can do it ?</p>