onLongPress
监听元素上的长按事件。返回一个停止函数。
示例
用法
vue
<script setup lang="ts">
import { onLongPress } from '@vueuse/core'
import { shallowRef, useTemplateRef } from 'vue'
const htmlRefHook = useTemplateRef('htmlRefHook')
const longPressedHook = shallowRef(false)
function onLongPressCallbackHook(e: PointerEvent) {
longPressedHook.value = true
}
function resetHook() {
longPressedHook.value = false
}
onLongPress(
htmlRefHook,
onLongPressCallbackHook,
{
modifiers: {
prevent: true
}
}
)
</script>
<template>
<p>长按状态:{{ longPressedHook }}</p>
<button ref="htmlRefHook" class="ml-2 button small">
长按
</button>
<button class="ml-2 button small" @click="resetHook">
重置
</button>
</template>自定义延迟
默认情况下,处理函数在 500 毫秒后触发。你可以通过 delay 选项自定义延迟时间。delay 可以是一个数字,也可以是接收 PointerEvent 的函数。
ts
import { onLongPress } from '@vueuse/core'
// 固定延迟
onLongPress(target, handler, { delay: 1000 })
// 根据事件动态延迟
onLongPress(target, handler, {
delay: ev => ev.pointerType === 'touch' ? 800 : 500,
})移动距离阈值
如果指针移动超过阈值(默认是 10 像素),长按将被取消。设置为 false 可禁用移动检测。
ts
import { onLongPress } from '@vueuse/core'
// 自定义阈值
onLongPress(target, handler, { distanceThreshold: 20 })
// 禁用移动检测
onLongPress(target, handler, { distanceThreshold: false })鼠标弹起回调
你可以提供一个 onMouseUp 回调,在指针释放时接收通知。
ts
import { onLongPress } from '@vueuse/core'
onLongPress(target, handler, {
onMouseUp(duration, distance, isLongPress) {
console.log(`按住了 ${duration} 毫秒,移动了 ${distance} 像素,是否长按:${isLongPress}`)
},
})修饰符
以下是可用的修饰符:
| 修饰符 | 说明 |
|---|---|
stop | 调用 event.stopPropagation() |
once | 事件触发后移除监听器 |
prevent | 调用 event.preventDefault() |
capture | 使用事件捕获模式监听事件 |
self | 仅当事件目标是绑定元素本身时触发 |
ts
onLongPress(target, handler, {
modifiers: {
prevent: true,
stop: true,
},
})组件用法
vue
<script setup lang="ts">
import { OnLongPress } from '@vueuse/components'
import { shallowRef } from 'vue'
const longPressedComponent = shallowRef(false)
function onLongPressCallbackComponent(e: PointerEvent) {
longPressedComponent.value = true
}
function resetComponent() {
longPressedComponent.value = false
}
</script>
<template>
<p>长按状态:{{ longPressedComponent }}</p>
<OnLongPress
as="button"
class="ml-2 button small"
@trigger="onLongPressCallbackComponent"
>
长按
</OnLongPress>
<button class="ml-2 button small" @click="resetComponent">
重置
</button>
</template>指令用法
vue
<script setup lang="ts">
import { vOnLongPress } from '@vueuse/components'
import { shallowRef } from 'vue'
const longPressedDirective = shallowRef(false)
function onLongPressCallbackDirective(e: PointerEvent) {
longPressedDirective.value = true
}
function resetDirective() {
longPressedDirective.value = false
}
</script>
<template>
<p>长按状态:{{ longPressedDirective }}</p>
<button
v-on-long-press.prevent="onLongPressCallbackDirective"
class="ml-2 button small"
>
长按
</button>
<button
v-on-long-press="[onLongPressCallbackDirective, { delay: 1000, modifiers: { stop: true } }]"
class="ml-2 button small"
>
长按(带选项)
</button>
<button class="ml-2 button small" @click="resetDirective">
重置
</button>
</template>类型声明
显示类型声明
ts
export interface OnLongPressOptions {
/**
* 长按触发 `longpress` 的时间(毫秒)
*
* @default 500
*/
delay?: number | ((ev: PointerEvent) => number)
modifiers?: OnLongPressModifiers
/**
* 允许的移动距离(像素),
* 当移动距离超过该值时,动作将被取消。
* @default 10
*/
distanceThreshold?: number | false
/**
* Function called when the ref element is released.
* @param duration how long the element was pressed in ms
* @param distance distance from the pointerdown position
* @param isLongPress whether the action was a long press or not
*/
onMouseUp?: (duration: number, distance: number, isLongPress: boolean) => void
}
export interface OnLongPressModifiers {
stop?: boolean
once?: boolean
prevent?: boolean
capture?: boolean
self?: boolean
}
export type OnLongPressReturn = () => void
/** @deprecated use {@link OnLongPressReturn} instead */
export type UseOnLongPressReturn = OnLongPressReturn
export declare function onLongPress(
target: MaybeElementRef,
handler: (evt: PointerEvent) => void,
options?: OnLongPressOptions,
): OnLongPressReturn