698 lines
17 KiB
Plaintext
698 lines
17 KiB
Plaintext
<template>
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<view
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class="cl-draggable"
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:class="[
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{
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'cl-draggable--columns': props.columns > 1
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},
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pt.className
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]"
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>
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<!-- @vue-ignore -->
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<view
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v-for="(item, index) in list"
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:key="getItemKey(item, index)"
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class="cl-draggable__item"
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:class="[
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{
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'cl-draggable__item--disabled': disabled,
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'cl-draggable__item--dragging': dragging && dragIndex == index,
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'cl-draggable__item--animating': dragging && dragIndex != index
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}
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]"
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:style="getItemStyle(index)"
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@touchstart="
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(event: UniTouchEvent) => {
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onTouchStart(event, index, 'touch');
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}
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"
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@longpress="
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(event: UniTouchEvent) => {
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onTouchStart(event, index, 'longpress');
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}
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"
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@touchmove="onTouchMove"
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@touchend="onTouchEnd"
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>
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<slot
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name="item"
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:item="item"
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:index="index"
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:dragging="dragging"
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:dragIndex="dragIndex"
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:insertIndex="insertIndex"
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>
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</slot>
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</view>
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</view>
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</template>
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<script lang="ts" setup>
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import { computed, ref, getCurrentInstance, type PropType, watch } from "vue";
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import { isNull, parsePt, uuid } from "@/cool";
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import type { PassThroughProps } from "../../types";
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import { vibrate } from "@/uni_modules/cool-vibrate";
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defineOptions({
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name: "cl-draggable"
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});
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defineSlots<{
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item(props: {
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item: UTSJSONObject;
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index: number;
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dragging: boolean;
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dragIndex: number;
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insertIndex: number;
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}): any;
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}>();
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// 项目位置信息类型定义
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type ItemPosition = {
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top: number;
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left: number;
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width: number;
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height: number;
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};
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// 位移偏移量类型定义
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type TranslateOffset = {
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x: number;
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y: number;
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};
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const props = defineProps({
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/** PassThrough 样式配置 */
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pt: {
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type: Object,
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default: () => ({})
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},
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/** 数据数组，支持双向绑定 */
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modelValue: {
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type: Array as PropType<UTSJSONObject[]>,
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default: () => []
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},
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/** 是否禁用拖拽功能 */
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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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/** 列数：1为单列纵向布局，>1为多列网格布局 */
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columns: {
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type: Number,
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default: 1
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},
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// 是否需要长按触发
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longPress: {
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type: Boolean,
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default: true
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}
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});
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const emit = defineEmits(["update:modelValue", "change", "start", "end"]);
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const { proxy } = getCurrentInstance()!;
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// 透传样式类型定义
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type PassThrough = {
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className?: string;
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ghost?: PassThroughProps;
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};
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/** PassThrough 样式解析 */
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const pt = computed(() => parsePt<PassThrough>(props.pt));
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/** 数据列表 */
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const list = ref<UTSJSONObject[]>([]);
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/** 是否正在拖拽 */
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const dragging = ref(false);
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/** 当前拖拽元素的原始索引 */
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const dragIndex = ref(-1);
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/** 预期插入的目标索引 */
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const insertIndex = ref(-1);
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/** 触摸开始时的Y坐标 */
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const startY = ref(0);
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/** 触摸开始时的X坐标 */
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const startX = ref(0);
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/** Y轴偏移量 */
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const offsetY = ref(0);
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/** X轴偏移量 */
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const offsetX = ref(0);
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/** 当前拖拽的数据项 */
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const dragItem = ref<UTSJSONObject>({});
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/** 所有项目的位置信息缓存 */
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const itemPositions = ref<ItemPosition[]>([]);
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/** 是否处于放下动画状态 */
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const dropping = ref(false);
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/** 动态计算的项目高度 */
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const itemHeight = ref(0);
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/** 动态计算的项目宽度 */
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const itemWidth = ref(0);
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/** 是否已开始排序模拟（防止误触） */
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const sortingStarted = ref(false);
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/**
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* 重置所有拖拽相关的状态
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* 在拖拽结束后调用，确保组件回到初始状态
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*/
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function reset() {
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dragging.value = false; // 拖拽状态
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dropping.value = false; // 放下动画状态
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dragIndex.value = -1; // 拖拽元素索引
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insertIndex.value = -1; // 插入位置索引
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offsetX.value = 0; // X轴偏移
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offsetY.value = 0; // Y轴偏移
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dragItem.value = {}; // 拖拽的数据项
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itemPositions.value = []; // 位置信息缓存
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itemHeight.value = 0; // 动态计算的高度
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itemWidth.value = 0; // 动态计算的宽度
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sortingStarted.value = false; // 排序模拟状态
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}
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/**
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* 计算网格布局中元素的位移偏移
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* @param index 当前元素索引
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* @param dragIdx 拖拽元素索引
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* @param insertIdx 插入位置索引
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* @returns 包含 x 和 y 坐标偏移的对象
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*/
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function calculateGridOffset(index: number, dragIdx: number, insertIdx: number): TranslateOffset {
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const cols = props.columns;
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// 计算当前元素在网格中的行列位置
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const currentRow = Math.floor(index / cols);
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const currentCol = index % cols;
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// 计算元素在拖拽后的新位置索引
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let newIndex = index;
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if (dragIdx < insertIdx) {
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// 向后拖拽：dragIdx+1 到 insertIdx 之间的元素需要向前移动一位
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if (index > dragIdx && index <= insertIdx) {
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newIndex = index - 1;
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}
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} else if (dragIdx > insertIdx) {
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// 向前拖拽：insertIdx 到 dragIdx-1 之间的元素需要向后移动一位
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if (index >= insertIdx && index < dragIdx) {
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newIndex = index + 1;
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}
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}
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// 计算新位置的行列坐标
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const newRow = Math.floor(newIndex / cols);
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const newCol = newIndex % cols;
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// 使用动态计算的网格尺寸
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const cellWidth = itemWidth.value;
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const cellHeight = itemHeight.value;
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// 计算实际的像素位移
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const offsetX = (newCol - currentCol) * cellWidth;
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const offsetY = (newRow - currentRow) * cellHeight;
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return { x: offsetX, y: offsetY };
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}
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/**
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* 计算网格布局的插入位置
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* @param dragCenterX 拖拽元素中心点X坐标
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* @param dragCenterY 拖拽元素中心点Y坐标
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* @returns 最佳插入位置索引
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*/
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function calculateGridInsertIndex(dragCenterX: number, dragCenterY: number): number {
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if (itemPositions.value.length == 0) {
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return dragIndex.value;
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}
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let closestIndex = dragIndex.value;
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let minDistance = Infinity;
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// 使用欧几里得距离找到最近的网格位置（包括原位置）
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for (let i = 0; i < itemPositions.value.length; i++) {
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const position = itemPositions.value[i];
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// 计算到元素中心点的距离
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const centerX = position.left + position.width / 2;
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const centerY = position.top + position.height / 2;
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// 使用欧几里得距离公式
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const distance = Math.sqrt(
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Math.pow(dragCenterX - centerX, 2) + Math.pow(dragCenterY - centerY, 2)
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);
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// 更新最近的位置
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if (distance < minDistance) {
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minDistance = distance;
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closestIndex = i;
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}
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}
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return closestIndex;
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}
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/**
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* 计算单列布局的插入位置
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* @param clientY Y坐标
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* @returns 最佳插入位置索引
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*/
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function calculateSingleColumnInsertIndex(clientY: number): number {
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let closestIndex = dragIndex.value;
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let minDistance = Infinity;
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// 遍历所有元素，找到距离最近的元素中心
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for (let i = 0; i < itemPositions.value.length; i++) {
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const position = itemPositions.value[i];
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// 计算到元素中心点的距离
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const itemCenter = position.top + position.height / 2;
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const distance = Math.abs(clientY - itemCenter);
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if (distance < minDistance) {
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minDistance = distance;
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closestIndex = i;
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}
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}
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return closestIndex;
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}
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/**
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* 计算拖拽元素的最佳插入位置
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* @param clientPosition 在主轴上的坐标（仅用于单列布局的Y轴坐标）
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* @returns 最佳插入位置的索引
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*/
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function calculateInsertIndex(clientPosition: number): number {
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// 如果没有位置信息，保持原位置
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if (itemPositions.value.length == 0) {
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return dragIndex.value;
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}
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// 根据布局类型选择计算方式
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if (props.columns > 1) {
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// 多列网格布局：计算拖拽元素的中心点坐标，使用2D坐标计算最近位置
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const dragPos = itemPositions.value[dragIndex.value];
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const dragCenterX = dragPos.left + dragPos.width / 2 + offsetX.value;
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const dragCenterY = dragPos.top + dragPos.height / 2 + offsetY.value;
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return calculateGridInsertIndex(dragCenterX, dragCenterY);
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} else {
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// 单列布局：基于Y轴距离计算最近的元素中心
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return calculateSingleColumnInsertIndex(clientPosition);
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}
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}
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/**
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* 计算单列布局的位移偏移
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* @param index 元素索引
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* @param dragIdx 拖拽元素索引
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* @param insertIdx 插入位置索引
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* @returns 位移偏移对象
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*/
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function calculateSingleColumnOffset(
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index: number,
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dragIdx: number,
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insertIdx: number
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): TranslateOffset {
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if (dragIdx < insertIdx) {
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// 向下拖拽：dragIdx+1 到 insertIdx 之间的元素向上移动
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if (index > dragIdx && index <= insertIdx) {
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return { x: 0, y: -itemHeight.value };
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}
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} else if (dragIdx > insertIdx) {
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// 向上拖拽：insertIdx 到 dragIdx-1 之间的元素向下移动
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if (index >= insertIdx && index < dragIdx) {
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return { x: 0, y: itemHeight.value };
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}
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}
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return { x: 0, y: 0 };
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}
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/**
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* 计算非拖拽元素的位移偏移量
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* @param index 元素索引
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* @returns 包含 x 和 y 坐标偏移的对象
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*/
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function getItemTranslateOffset(index: number): TranslateOffset {
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// 只在满足所有条件时才计算位移：拖拽中、非放下状态、已开始排序
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if (!dragging.value || dropping.value || !sortingStarted.value) {
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return { x: 0, y: 0 };
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}
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const dragIdx = dragIndex.value;
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const insertIdx = insertIndex.value;
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// 跳过正在拖拽的元素（拖拽元素由位置控制）
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if (index == dragIdx) {
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return { x: 0, y: 0 };
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}
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// 没有位置变化时不需要位移（拖回原位置）
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if (dragIdx == insertIdx) {
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return { x: 0, y: 0 };
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}
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// 根据布局类型计算位移
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if (props.columns > 1) {
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// 多列网格布局：使用2D位移计算
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return calculateGridOffset(index, dragIdx, insertIdx);
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} else {
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// 单列布局：使用简单的纵向位移
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return calculateSingleColumnOffset(index, dragIdx, insertIdx);
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}
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}
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/**
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* 计算项目的完整样式对象
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* @param index 项目索引
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* @returns 样式对象
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*/
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function getItemStyle(index: number) {
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const style = {};
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const isCurrent = dragIndex.value == index;
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// 多列布局时设置等宽分布
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if (props.columns > 1) {
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const widthPercent = 100 / props.columns;
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style["flex-basis"] = `${widthPercent}%`;
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style["width"] = `${widthPercent}%`;
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style["box-sizing"] = "border-box";
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}
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// 放下动画期间，只保留基础样式
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if (dropping.value) {
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return style;
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}
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// 拖拽状态下的样式处理
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if (dragging.value) {
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if (isCurrent) {
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// 拖拽元素：跟随移动
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style["transform"] = `translate(${offsetX.value}px, ${offsetY.value}px)`;
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style["z-index"] = "100";
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} else {
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// 其他元素：显示排序预览位移
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const translateOffset = getItemTranslateOffset(index);
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style["transform"] = `translate(${translateOffset.x}px, ${translateOffset.y}px)`;
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}
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}
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return style;
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}
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/**
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* 获取所有项目的位置信息
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*/
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async function getItemPosition(): Promise<void> {
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return new Promise((resolve) => {
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uni.createSelectorQuery()
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.in(proxy)
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.select(".cl-draggable")
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.boundingClientRect()
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.exec((res) => {
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const box = res[0] as NodeInfo;
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itemWidth.value = (box.width ?? 0) / props.columns;
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uni.createSelectorQuery()
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.in(proxy)
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.selectAll(".cl-draggable__item")
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.boundingClientRect()
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.exec((res) => {
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const rects = res[0] as NodeInfo[];
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const positions: ItemPosition[] = [];
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for (let i = 0; i < rects.length; i++) {
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const rect = rects[i];
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if (i == 0) {
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itemHeight.value = rect.height ?? 0;
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}
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positions.push({
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top: rect.top ?? 0,
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left: rect.left ?? 0,
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width: itemWidth.value,
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height: itemHeight.value
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});
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}
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itemPositions.value = positions;
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resolve();
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});
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});
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});
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}
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/**
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* 获取项目是否禁用
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* @param index 项目索引
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* @returns 是否禁用
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*/
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function getItemDisabled(index: number): boolean {
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return !isNull(list.value[index]["disabled"]) && (list.value[index]["disabled"] as boolean);
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}
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/**
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* 检查拖拽元素的中心点是否移动到其他元素区域
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*/
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function checkMovedToOtherElement(): boolean {
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// 如果没有位置信息，默认未移出
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if (itemPositions.value.length == 0) return false;
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const dragIdx = dragIndex.value;
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const dragPosition = itemPositions.value[dragIdx];
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// 计算拖拽元素当前的中心点位置（考虑拖拽偏移）
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const dragCenterX = dragPosition.left + dragPosition.width / 2 + offsetX.value;
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const dragCenterY = dragPosition.top + dragPosition.height / 2 + offsetY.value;
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// 根据布局类型采用不同的判断策略
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if (props.columns > 1) {
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// 多列网格布局：检查中心点是否与其他元素区域重叠
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for (let i = 0; i < itemPositions.value.length; i++) {
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if (i == dragIdx) continue;
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const otherPosition = itemPositions.value[i];
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const isOverlapping =
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dragCenterX >= otherPosition.left &&
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dragCenterX <= otherPosition.left + otherPosition.width &&
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dragCenterY >= otherPosition.top &&
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dragCenterY <= otherPosition.top + otherPosition.height;
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if (isOverlapping) {
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return true;
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}
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}
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} else {
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// 检查是否向上移动超过上一个元素的中线
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if (dragIdx > 0) {
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const prevPosition = itemPositions.value[dragIdx - 1];
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const prevCenterY = prevPosition.top + prevPosition.height / 2;
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if (dragCenterY <= prevCenterY) {
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return true;
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}
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}
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// 检查是否向下移动超过下一个元素的中线
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if (dragIdx < itemPositions.value.length - 1) {
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const nextPosition = itemPositions.value[dragIdx + 1];
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||
const nextCenterY = nextPosition.top + nextPosition.height / 2;
|
||
if (dragCenterY >= nextCenterY) {
|
||
return true;
|
||
}
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/**
|
||
* 触摸开始事件处理
|
||
* @param event 触摸事件对象
|
||
* @param index 触摸的项目索引
|
||
*/
|
||
async function onTouchStart(event: UniTouchEvent, index: number, type: string) {
|
||
// 如果是长按触发，但未开启长按功能，则直接返回
|
||
if (type == "longpress" && !props.longPress) return;
|
||
// 如果是普通触摸触发，但已开启长按功能，则直接返回
|
||
if (type == "touch" && props.longPress) return;
|
||
|
||
// 检查是否禁用或索引无效
|
||
if (props.disabled) return;
|
||
if (getItemDisabled(index)) return;
|
||
if (index < 0 || index >= list.value.length) return;
|
||
|
||
// 获取触摸点
|
||
const touch = event.touches[0];
|
||
|
||
// 初始化拖拽状态
|
||
dragging.value = true;
|
||
|
||
// 初始化拖拽索引
|
||
dragIndex.value = index;
|
||
insertIndex.value = index; // 初始插入位置为原位置
|
||
startX.value = touch.clientX;
|
||
startY.value = touch.clientY;
|
||
offsetX.value = 0;
|
||
offsetY.value = 0;
|
||
// 初始化拖拽数据项
|
||
dragItem.value = list.value[index];
|
||
|
||
// 先获取所有项目的位置信息，为后续计算做准备
|
||
await getItemPosition();
|
||
|
||
// 触发开始事件
|
||
emit("start", index);
|
||
|
||
// 震动
|
||
vibrate(1);
|
||
|
||
// 阻止事件冒泡
|
||
event.stopPropagation();
|
||
// 阻止默认行为
|
||
event.preventDefault();
|
||
}
|
||
|
||
/**
|
||
* 触摸移动事件处理
|
||
* @param event 触摸事件对象
|
||
*/
|
||
function onTouchMove(event: TouchEvent): void {
|
||
if (!dragging.value) return;
|
||
|
||
const touch = event.touches[0];
|
||
|
||
// 更新拖拽偏移量
|
||
offsetX.value = touch.clientX - startX.value;
|
||
offsetY.value = touch.clientY - startY.value;
|
||
|
||
// 智能启动排序模拟：只有移出原元素区域才开始
|
||
if (!sortingStarted.value) {
|
||
if (checkMovedToOtherElement()) {
|
||
sortingStarted.value = true;
|
||
}
|
||
}
|
||
|
||
// 只有开始排序模拟后才计算插入位置
|
||
if (sortingStarted.value) {
|
||
// 计算拖拽元素当前的中心点坐标
|
||
const dragPos = itemPositions.value[dragIndex.value];
|
||
const dragCenterX = dragPos.left + dragPos.width / 2 + offsetX.value;
|
||
const dragCenterY = dragPos.top + dragPos.height / 2 + offsetY.value;
|
||
|
||
// 根据布局类型选择坐标轴：网格布局使用X坐标，单列布局使用Y坐标
|
||
const dragCenter = props.columns > 1 ? dragCenterX : dragCenterY;
|
||
|
||
// 计算最佳插入位置
|
||
const newIndex = calculateInsertIndex(dragCenter);
|
||
if (newIndex != insertIndex.value) {
|
||
insertIndex.value = newIndex;
|
||
}
|
||
}
|
||
|
||
// 阻止默认行为
|
||
event.preventDefault();
|
||
}
|
||
|
||
/**
|
||
* 触摸结束事件处理
|
||
*/
|
||
function onTouchEnd(): void {
|
||
if (!dragging.value) return;
|
||
|
||
// 旧索引
|
||
const oldIndex = dragIndex.value;
|
||
|
||
// 新索引
|
||
const newIndex = insertIndex.value;
|
||
|
||
// 如果位置发生变化，立即更新数组
|
||
if (oldIndex != newIndex && newIndex >= 0) {
|
||
const newList = [...list.value];
|
||
const item = newList.splice(oldIndex, 1)[0];
|
||
newList.splice(newIndex, 0, item);
|
||
list.value = newList;
|
||
|
||
// 触发变化事件
|
||
emit("update:modelValue", list.value);
|
||
emit("change", list.value);
|
||
}
|
||
|
||
// 开始放下动画
|
||
dropping.value = true;
|
||
dragging.value = false;
|
||
|
||
// 重置所有状态
|
||
reset();
|
||
|
||
// 等待放下动画完成后重置所有状态
|
||
emit("end", newIndex >= 0 ? newIndex : oldIndex);
|
||
}
|
||
|
||
/**
|
||
* 根据平台选择合适的key
|
||
* @param item 数据项
|
||
* @param index 索引
|
||
* @returns 合适的key
|
||
*/
|
||
function getItemKey(item: UTSJSONObject, index: number): string {
|
||
// #ifdef MP
|
||
// 小程序环境使用 index 作为 key，避免数据错乱
|
||
return `${index}`;
|
||
// #endif
|
||
|
||
// #ifndef MP
|
||
// 其他平台使用 uid，提供更好的性能
|
||
return item["uid"] as string;
|
||
// #endif
|
||
}
|
||
|
||
watch(
|
||
computed(() => props.modelValue),
|
||
(val: UTSJSONObject[]) => {
|
||
list.value = val.map((e) => {
|
||
return {
|
||
uid: e["uid"] ?? uuid(),
|
||
...e
|
||
};
|
||
});
|
||
},
|
||
{
|
||
immediate: true
|
||
}
|
||
);
|
||
</script>
|
||
|
||
<style lang="scss" scoped>
|
||
.cl-draggable {
|
||
@apply flex-col relative overflow-visible;
|
||
|
||
&--columns {
|
||
@apply flex-row flex-wrap;
|
||
}
|
||
|
||
&__item {
|
||
@apply relative z-10;
|
||
|
||
// #ifdef APP-IOS
|
||
@apply transition-none opacity-100;
|
||
// #endif
|
||
|
||
&--dragging {
|
||
@apply opacity-80 z-20;
|
||
}
|
||
|
||
&--disabled {
|
||
@apply opacity-60;
|
||
}
|
||
|
||
&--animating {
|
||
@apply duration-200;
|
||
transition-property: transform;
|
||
}
|
||
}
|
||
}
|
||
</style>
|