How to control click vs drag threshold?

[Tsuguri]

Hello 👋🏻

I'm rendering my UI in VR space and want user to control it with laser pointer. In general it works but I have problem with buttons rejecting my triggers because laser pointer moves too much when user is pressing the trigger (one has to very carefully keep controller in place).

Is there a way to control that behaviour to allow bigger movement before EGUI decides it's a drag instead of click?

Currently I'm doing that manually (reporting pointer to stay in the same position before it moves more than X units) but I'm afraid it will mess up other controls, eg. sliders. I'm kinda assuming that controls that do not click will ignore that threshold and start dragging right away but I'm not very experienced with UIs tbh.

[YgorSouza]

That is controlled by the InputOptions struct:

egui/crates/egui/src/input_state/mod.rs

Lines 20 to 38 in 6ccb768

	/// Options for input state handling.
	#[derive(Clone, Debug, PartialEq)]
	#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
	pub struct InputOptions {
	/// After a pointer-down event, if the pointer moves more than this, it won't become a click.
	pub max_click_dist: f32,
	/// If the pointer is down for longer than this it will no longer register as a click.
	///
	/// If a touch is held for this many seconds while still, then it will register as a
	/// "long-touch" which is equivalent to a secondary click.
	///
	/// This is to support "press and hold for context menu" on touch screens.
	pub max_click_duration: f64,
	/// The new pointer press must come within this many seconds from previous pointer release
	/// for double click (or when this value is doubled, triple click) to count.
	pub max_double_click_delay: f64,
	}

It's not in the docs for some reason, but it is a public type, and you can modify it like this:

ui.ctx().options_mut(|opt| {
    opt.input_options.max_click_dist = 200.0;
    opt.input_options.max_click_duration = 1.0;
});

[Tsuguri]

Thank you very much! I was just able to remove my hack and set max_click_dist = 100.0 and I can click properly now (I should definitely do controller rotation smoothing though).