Add Interaction::Released (Detect the release of a UIButton)

[Weibye]

Objective

Fix #5769

Solution

Change to Interaction::Released instead of Interaction::None for 1 frame as the button is released.

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Changelog

Added

• Interaction now be considered Interaction::Released for 1 frame when the user has released interaction on the button.

Feedback Wanted / Unresolved Questions

This solution relies on the ui_focus system running for 1 more frame after the interaction has been released, meaning that it does not work currently work when using the "DesktopMode" winit setting that only runs systems when user-input has occurred. It will be stuck in "Released" state until some new input is provided by the user.

Any ideas as to how that can be solved?

[alice-i-cecile]

Suggested change

	/// The node has been released from
	/// The node has just been released

[alice-i-cecile]

This solution relies on the ui_focus system running for 1 more frame after the interaction has been released, meaning that it does not work currently work when using the "DesktopMode" winit setting that only runs systems when user-input has occurred. It will be stuck in "Released" state until some new input is provided by the user.

That's pretty unfortunate. We could add another system at the end of the frame to reset them? Or run for two frames on interaction in DesktopMode.

[Weibye]

We could add another system at the end of the frame to reset them?

When does input reset their "just_pressed" / "just_released" states? Is it within the same frame but at the end of the update stage?

[alice-i-cecile]

When does input reset their "just_pressed" / "just_released" states? Is it within the same frame but at the end of the update stage?

Near the start of each frame in PreUpdate. I actually think this is a bit of a mistake, as it wreaks havoc with things like fixed time steps, but that's the current strategy.

[alice-i-cecile]

This is relatively complex, and we haven't reached consensus on the design. Removing from the 0.10 milestone.

[shanecelis]

I thought I wanted Released too, but I was convinced that Released is a transition not a state by @Shatur. I added a longer comment here.