UIElements touch events?

Is there a way to get touch events? I'm using MouseDownEvent and MouseUpEvent, and MouseMoveEvent checking button presses for dragging. i see PointerDownEvent and PointerUpEvent, but PointerMoveEvent doesnt have a way to detect drag for touch. which is preferred?

 

I cannot get those to work at runtime, and I get errors when I try to build with them being used in the project.

error CS1069: The type name 'DragEnterEvent' could not be found in the namespace 'UnityEngine.UIElements'. This type has been forwarded to assembly 'UnityEngine.UIElementsModule, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' Enable the built in package 'UIElements' in the Package Manager window to fix this error.

Also as of preview 10 they have been removed from the Player.

• Removed ability to reference drag events in the Player, since those are never sent

 

Things to consider with PointerEvents : if you register to them, you might have more than one event per touch with the current event system.

For a swiping thing I implemented, I discarded imguiEvent and events not corresponding to the first finger touching the screen :

Code (CSharp):

1. private void _OnPointerDown(PointerDownEvent evt)
2. {
3.        if (evt.imguiEvent != null || evt.pointerId != 1)
4.            return;
5.  
6.        // Do your things here
7. }

(BTW, more information on pointerIds and multi-touch if needed : https://forum.unity.com/threads/does-multi-touch-work-at-runtime-for-android.956412/#post-6239945 )

There are still some issues with touch support though :\
If your PanelSettings rescale the panel, the y-coordinates of your touch events will be distorted or have an offset (so you might not receive some touch events).


@unity_griendeau , I think there is an issue inside UI Toolkit Event System could you take a look at the following code directly from the package ?

There is also an issue with delta position, which should be something like this :

Code (CSharp):

1. touch.deltaPosition = new Vector2(touch.deltaPosition.x, -touch.deltaPosition.y);

(PS : for whatever reason, I'm not allowed to post my message if I write the method names )

 

Latest UI Toolkit runtime version (preview.14), Unity 2020.2.6 : touch inputs are still offset when panel.scale is different from 1.

Bug seems(?) to be still there in DefaultEventSystem.cs lines 204 to 207.
I still think the "Flip Y Coordinates" should be made l.234 just before sending the position based event along the panel, as the event position will depend on the panel scale.
If the coordinates must be flipped after that, nevertheless, the panel height should be used : not the screen height (which is not depending on the panel scale).

Also I guess this :

Code (CSharp):

1. touch.deltaPosition = new Vector2(touch.deltaPosition.x, Screen.height - touch.deltaPosition.y);

Should be this :

Code (CSharp):

1. touch.deltaPosition = new Vector2(touch.deltaPosition.x, - touch.deltaPosition.y);

 

I can confirm this. I have a UIDocument that the buttons don't work unless it is the native resolution in the panel settings or same aspect ratio.

 

I regret upgrading to the "new" input system, from when I used to use Input.touches ..

I'm trying to use Pointer for both mouse events and touch events - is this the way to go? If so, PointerMoveEvent has different meaning - for a mouse drag, we can check whether a button was pressed, but what is the equivalent for non-mouse? do we just explicitly check that it's not a mouse pointer?