331 lines
7.0 KiB
Plaintext
331 lines
7.0 KiB
Plaintext
<template>
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<view
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class="cl-slider"
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:class="[
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{
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'cl-slider--disabled': disabled
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},
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pt.className
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]"
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>
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<view
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class="cl-slider__inner"
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:style="{
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height: blockSize + 'px'
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}"
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>
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<view class="cl-slider__track" :class="[pt.track?.className]">
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<view
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class="cl-slider__progress"
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:style="{
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width: percentage + '%'
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}"
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></view>
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<view class="cl-slider__thumb" :class="[pt.thumb?.className]" :style="thumbStyle">
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</view>
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</view>
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<view
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class="cl-slider__picker"
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:style="{
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height: blockSize * 1.5 + 'px'
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}"
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@touchstart="onTouchStart"
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@touchmove="onTouchMove"
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@touchend="onTouchEnd"
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@touchcancel="onTouchEnd"
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></view>
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</view>
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<cl-text
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v-if="showValue"
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:pt="{
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className: parseClass(['text-center w-[100rpx]', pt.value?.className])
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}"
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>
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{{ value }}
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</cl-text>
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</view>
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</template>
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<script setup lang="ts">
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import { computed, getCurrentInstance, nextTick, onMounted, ref, watch } from "vue";
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import { parseClass, parsePt } from "@/cool";
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import type { PassThroughProps } from "../../types";
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defineOptions({
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name: "cl-slider"
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});
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// 组件属性定义
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const props = defineProps({
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// 样式穿透对象
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pt: {
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type: Object,
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default: () => ({})
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},
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// v-model 绑定的值
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modelValue: {
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type: Number,
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default: 0
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},
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// 最小值
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min: {
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type: Number,
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default: 0
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},
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// 最大值
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max: {
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type: Number,
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default: 100
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},
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// 步长
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step: {
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type: Number,
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default: 1
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},
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// 是否禁用
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disabled: {
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type: Boolean,
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default: false
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},
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// 滑块的大小（px）
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blockSize: {
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type: Number,
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default: 20
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},
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// 是否显示当前值
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showValue: {
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type: Boolean,
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default: false
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}
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});
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const emit = defineEmits(["update:modelValue", "change", "changing"]);
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const { proxy } = getCurrentInstance()!;
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// 样式穿透类型定义
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type PassThrough = {
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className?: string;
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track?: PassThroughProps;
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progress?: PassThroughProps;
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thumb?: PassThroughProps;
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value?: PassThroughProps;
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};
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// 计算样式穿透对象
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const pt = computed(() => parsePt<PassThrough>(props.pt));
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// 当前滑块的值，受控于v-model
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const value = ref<number>(props.modelValue);
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// 轨道宽度（像素）
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const trackWidth = ref<number>(0);
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// 轨道左侧距离屏幕的距离（像素）
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const trackLeft = ref<number>(0);
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// 计算当前值在[min, max]区间内的百分比
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const percentage = computed(() => {
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// 公式：(当前值 - 最小值) / (最大值 - 最小值) * 100
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// 结果为0~100之间的百分比
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return ((value.value - props.min) / (props.max - props.min)) * 100;
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});
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// 计算滑块thumb的样式
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const thumbStyle = computed(() => {
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const style = new Map<string, string>();
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// 如果轨道宽度还没获取到，先用百分比定位
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if (trackWidth.value == 0) {
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style.set("left", `${percentage.value}%`);
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style.set("width", `${props.blockSize}px`);
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style.set("height", `${props.blockSize}px`);
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style.set("transform", `translateX(-50%)`);
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}
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// 使用像素定位，确保滑块始终在轨道范围内
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// 可滑动的有效区域 = 轨道宽度 - 滑块宽度
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const effectiveTrackWidth = trackWidth.value - props.blockSize;
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// 滑块左边距 = 百分比 * 有效轨道宽度
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const leftPosition = (percentage.value / 100) * effectiveTrackWidth;
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// 限制在有效范围内
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const finalLeft = Math.max(0, Math.min(effectiveTrackWidth, leftPosition));
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// 返回样式对象，使用像素定位
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style.set("left", `${finalLeft}px`);
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style.set("width", `${props.blockSize}px`);
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style.set("height", `${props.blockSize}px`);
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return style;
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});
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// 获取滑块轨道的宽度和左边距，用于后续触摸计算
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function getTrackInfo() {
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uni.createSelectorQuery()
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.in(proxy)
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.select(".cl-slider__track")
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.boundingClientRect((node) => {
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trackWidth.value = (node as NodeInfo).width ?? 0;
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trackLeft.value = (node as NodeInfo).left ?? 0;
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})
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.exec();
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}
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// 根据触摸点的clientX计算对应的滑块值
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function calculateValue(clientX: number): number {
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// 如果轨道宽度为0，直接返回当前值
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if (trackWidth.value == 0) return value.value;
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// 计算触摸点距离轨道左侧的偏移
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const offset = clientX - trackLeft.value;
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// 计算百分比，限制在0~1之间
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const percentage = Math.max(0, Math.min(1, offset / trackWidth.value));
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// 计算值区间
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const range = props.max - props.min;
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// 计算实际值
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let val = props.min + percentage * range;
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// 按步长取整
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if (props.step > 0) {
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val = Math.round((val - props.min) / props.step) * props.step + props.min;
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}
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// 限制在[min, max]区间
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return Math.max(props.min, Math.min(props.max, val));
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}
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// 更新滑块的值，并触发v-model和changing事件
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function updateValue(val: number) {
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if (val !== value.value) {
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value.value = val;
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emit("update:modelValue", val);
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emit("changing", val);
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}
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}
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// 触摸开始事件，获取轨道信息并初步设置值
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function onTouchStart(e: UniTouchEvent) {
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if (props.disabled) return;
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getTrackInfo();
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// 延迟10ms，确保轨道信息已获取
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setTimeout(() => {
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const clientX = e.touches[0].clientX;
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const value = calculateValue(clientX);
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updateValue(value);
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}, 10);
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}
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// 触摸移动事件，实时更新滑块值
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function onTouchMove(e: UniTouchEvent) {
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if (props.disabled) return;
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e.preventDefault();
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const clientX = e.touches[0].clientX;
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const value = calculateValue(clientX);
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updateValue(value);
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}
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// 触摸结束事件，触发change事件
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function onTouchEnd() {
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if (props.disabled) return;
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emit("change", value.value);
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}
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// 监听外部v-model的变化，保持内部value同步
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watch(
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computed(() => props.modelValue),
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(val: number) => {
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if (val !== value.value) {
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// 限制同步值在[min, max]区间
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value.value = Math.max(props.min, Math.min(props.max, val));
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}
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},
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{ immediate: true }
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);
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// 监听max的变化，确保value不会超过max
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watch(
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computed(() => props.max),
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(val: number) => {
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if (value.value > val) {
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updateValue(val);
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}
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},
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{
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immediate: true
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}
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);
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// 监听min的变化，确保value不会小于min
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watch(
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computed(() => props.min),
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(val: number) => {
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if (value.value < val) {
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updateValue(val);
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}
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},
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{
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immediate: true
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}
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);
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watch(
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computed(() => props.showValue),
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() => {
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nextTick(() => {
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getTrackInfo();
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});
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}
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);
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onMounted(() => {
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getTrackInfo();
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});
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</script>
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<style lang="scss" scoped>
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.cl-slider {
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@apply flex flex-row items-center w-full;
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overflow: visible;
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&--disabled {
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opacity: 0.6;
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pointer-events: none;
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}
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&__inner {
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@apply flex-1 relative h-full flex flex-row items-center;
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overflow: visible;
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}
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&__picker {
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@apply absolute left-0 w-full;
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}
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&__track {
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@apply relative w-full rounded-full;
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@apply bg-surface-200;
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height: 8rpx;
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overflow: visible;
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}
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&__progress {
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@apply absolute top-0 left-0 h-full rounded-full;
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@apply bg-primary-400;
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}
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&__thumb {
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@apply absolute top-1/2 rounded-full border border-solid border-white;
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@apply bg-primary-500;
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transform: translateY(-50%);
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pointer-events: none;
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}
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}
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</style>
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