Meshes and Scenes support OnDoublePickTrigger and OnLongPressTrigger.
But how can we handle double-click and long-press triggers for a GUI Button?
In the Docs: GUI - Events I can see that we can handle a click (onPointerClickObservable) and this works in the Playground
Am I missing something, or is this just a missing Feature?
If so: is there an easy way to implement this? Maybe I can reuse the ActionManager somehow or use RxJs (based on onPointerEnterObservable and onPointerOutObservable)?
Let’s ping @PolygonalSun here 
AFAIK, the only way to get double click and long click to work would be to manually implement something using the button’s observables (@carolhmj or @RaananW, feel free to correct me if I’m wrong). For example, you could always store the current time that a pointerdown occurred and then check it in the onPointerClick to see if the time exceeded some value:
var time = 0;
...
button.onPointerDownObservable.add(function() {
time = Date.now();
});
button.onPointerClickObservable.add(function () {
const deltaTime = Date.now() - time;
if (deltaTime >= 500) {
console.log("Long Click");
}
...
For double-click, you’d have to check the time between clicks and determine if it’s less than some value:
var clickTime = 0;
...
button.onPointerClickObservable.add(function () {
const deltaDoubleTime = Date.now() - clickTime;
if (deltaDoubleTime < 500) {
console.log("Double Click");
// If we have a double-click, reset the timer so that a third click doesn't trigger another double-click
clickTime = 0;
}
else {
clickTime = Date.now();
}
...
Putting these together may require some timing checks and logic to prevent unnecessary clicks but this would be the gist of it.
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@PolygonalSun thanks for the answer. I see what you mean.
This logic becomes quite complicated when we also want to have longPress (then we need a timer).
Should I file a feature-request on GitHub, so that these events will eventually be added to GUI elements in the future?
I’d recommend posting a request on the Feature Requests page of the forum to start out.