feat(onLongPress): allow function as value in delay (#4979)

Author: keeplearning66

packages/core/onLongPress/index.test.ts

@@ -24,9 +24,9 @@ describe('onLongPress', () => {
     expect(onLongPressCallback).toHaveBeenCalledTimes(1)
   }
 
-  async function triggerCallbackWithDelay(isRef: boolean) {
+  async function triggerCallbackWithDelay(isRef: boolean, delayFunc?: (ev: PointerEvent) => number) {
     const onLongPressCallback = vi.fn()
-    onLongPress(isRef ? element : element.value, onLongPressCallback, { delay: 1000 })
+    onLongPress(isRef ? element : element.value, onLongPressCallback, { delay: delayFunc ?? 1000 })
     // first pointer down
     element.value.dispatchEvent(pointerdownEvent)
 
@@ -199,6 +199,7 @@ describe('onLongPress', () => {
       it('should remove event listeners after being stopped', () => stopEventListeners(isRef))
       it('should trigger longpress if pointer is moved', () => triggerCallbackWithThreshold(isRef))
       it('should trigger onMouseUp when pointer is released', () => triggerOnMouseUp(isRef))
+      it('should trigger longpress after options.delay ms when options.delay is a function', () => triggerCallbackWithDelay(isRef, () => 1000))
     })
   }
 

packages/core/onLongPress/index.ts

@@ -14,7 +14,7 @@ export interface OnLongPressOptions {
    *
    * @default 500
    */
-  delay?: number
+  delay?: number | ((ev: PointerEvent) => number)
 
   modifiers?: OnLongPressModifiers
 
@@ -64,6 +64,14 @@ export function onLongPress(
     hasLongPressed = false
   }
 
+  function getDelay(ev: PointerEvent): number {
+    const delay = options?.delay
+    if (typeof delay === 'function') {
+      return delay(ev)
+    }
+    return delay ?? DEFAULT_DELAY
+  }
+
   function onRelease(ev: PointerEvent) {
     const [_startTimestamp, _posStart, _hasLongPressed] = [startTimestamp, posStart, hasLongPressed]
     clear()
@@ -108,7 +116,7 @@ export function onLongPress(
         hasLongPressed = true
         handler(ev)
       },
-      options?.delay ?? DEFAULT_DELAY,
+      getDelay(ev),
     )
   }