Tip: use Event.current.delta to make text label scroll on touch devices

Hey colleagues, thought I would post a tip for those still using Unity's old GUI (which imho still has essential uses).

I was trying to get a label scroll on mobile devices when the user swipes up/down. Instead of handling touch events separately, I simply used Event.current.delta in my GUI code since Unity records touch locations as if they are mouse pointer ones in Event. It's not perfect (and sometimes jittery) but since it's a feature for debugging in my app, i didn't mind. It could easily be couched in a Lerp or something to make it more professional. Anyways, thought I would share the code as I didn't find any info on this when I searched for it and others may have the same challenge.

Here's a quick-n-dirty message box code:

Code (CSharp):

1. void MessageWindow(int windowID)
2. {
3. // for my needs I simply used GUILayout as in many of my GUI windows they change based on input.
4. //So could'nt be bothered with precise Rects
5.  
6.         GUILayout.Space(5f);
7.         GUILayout.BeginVertical();
8.  
9.         msg_scroll = GUILayout.BeginScrollView(msg_scroll);
10.         GUILayout.Label(message);
11.         GUILayout.EndScrollView();
12.        
13.     GUILayout.Space(10f);
14.         GUILayout.FlexibleSpace();
15.  
16. // HERE is the code that interprets touch/swipe movement to make the label scroll vertically
17. // To minimize jitter when user touches different locations
18. // i ignore touch events that are too far apart using "Mathf.Abs(Event.current.delta.y) < 15f"
19.         msg_scroll.y += Mathf.Abs(Event.current.delta.y) < 15f ? Event.current.delta.y : 0;
20.        
21.  
22.         if (GUILayout.Button("Ok") || Event.current.keyCode == KeyCode.Return || Event.current.keyCode == KeyCode.KeypadEnter)
23.         {
24.             CloseWindow();
25.     }
26.        
27.     GUILayout.EndVertical();
28. }