Dragging an ImageView using touch events

Now that we have allowed the user to select a funny face image from our four animated ImageView controls, we need to allow them to adjust the position of their own photo so it fits within the transparent hole that makes up the face portion of our funny face. We will do this using the touch events available to us in the ImageView control.

How to do it…

The simplest way to perform this task is by capturing the x and y touch points and moving the ImageView to that location. The code for this is simple; just add the following code after your declaration of the imageViewFace control, but before you add this control to your window:

imageViewFace.addEventListener('touchmove', function(e){
  imageViewMe.left = e.x;
  imageViewMe.top = e.y;
});

Now run your app in the emulator and, after selecting a funny face image, attempt to touch and drag your photograph around the screen. You should notice that it works but it doesn't seem quite right, does it? This is because...