hover.mjs
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import { isDragActive } from './drag/state/is-active.mjs';
import { setupGesture } from './utils/setup.mjs';
function isValidHover(event) {
return !(event.pointerType === "touch" || isDragActive());
}
/**
* Create a hover gesture. hover() is different to .addEventListener("pointerenter")
* in that it has an easier syntax, filters out polyfilled touch events, interoperates
* with drag gestures, and automatically removes the "pointerennd" event listener when the hover ends.
*
* @public
*/
function hover(elementOrSelector, onHoverStart, options = {}) {
const [elements, eventOptions, cancel] = setupGesture(elementOrSelector, options);
elements.forEach((element) => {
let isPressed = false;
let deferredHoverEnd = false;
let hoverEndCallback;
const removePointerLeave = () => {
element.removeEventListener("pointerleave", onPointerLeave);
};
const endHover = (event) => {
if (hoverEndCallback) {
hoverEndCallback(event);
hoverEndCallback = undefined;
}
removePointerLeave();
};
const onPointerUp = (event) => {
isPressed = false;
window.removeEventListener("pointerup", onPointerUp);
window.removeEventListener("pointercancel", onPointerUp);
if (deferredHoverEnd) {
deferredHoverEnd = false;
endHover(event);
}
};
const onPointerDown = () => {
isPressed = true;
window.addEventListener("pointerup", onPointerUp, eventOptions);
window.addEventListener("pointercancel", onPointerUp, eventOptions);
};
const onPointerLeave = (leaveEvent) => {
if (leaveEvent.pointerType === "touch")
return;
if (isPressed) {
deferredHoverEnd = true;
return;
}
endHover(leaveEvent);
};
const onPointerEnter = (enterEvent) => {
if (!isValidHover(enterEvent))
return;
deferredHoverEnd = false;
const onHoverEnd = onHoverStart(element, enterEvent);
if (typeof onHoverEnd !== "function")
return;
hoverEndCallback = onHoverEnd;
element.addEventListener("pointerleave", onPointerLeave, eventOptions);
};
element.addEventListener("pointerenter", onPointerEnter, eventOptions);
element.addEventListener("pointerdown", onPointerDown, eventOptions);
});
return cancel;
}
export { hover };
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