<template>
  <div
    :style="style"
    :class="[
      {
        [classNameActive]: enabled,
        [classNameDragging]: dragging,
        [classNameResizing]: resizing,
        [classNameDraggable]: draggable,
        [classNameResizable]: resizable
      },
      className
    ]"
    @mousedown="elementMouseDown"
    @touchstart="elementTouchDown"
  >
    <div
      v-for="handle in actualHandles"
      :key="handle"
      :class="[classNameHandle, classNameHandle + '-' + handle]"
      :style="handleStyle(handle)"
      @mousedown.stop.prevent="handleDown(handle, $event)"
      @touchstart.stop.prevent="handleTouchDown(handle, $event)"
    >
      <slot :name="handle"></slot>
    </div>
    <slot></slot>
  </div>
</template>

<script>
import { matchesSelectorToParentElements, getComputedSize, addEvent, removeEvent } from './dom';
import { computeWidth, computeHeight, restrictToBounds, snapToGrid } from './fns';

const events = {
  mouse: {
    start: 'mousedown',
    move: 'mousemove',
    stop: 'mouseup'
  },
  touch: {
    start: 'touchstart',
    move: 'touchmove',
    stop: 'touchend'
  }
};

// 禁止用户选取
const userSelectNone = {
  userSelect: 'none',
  MozUserSelect: 'none',
  WebkitUserSelect: 'none',
  MsUserSelect: 'none'
};
// 用户选中自动
const userSelectAuto = {
  userSelect: 'auto',
  MozUserSelect: 'auto',
  WebkitUserSelect: 'auto',
  MsUserSelect: 'auto'
};

let eventsFor = events.mouse;

export default {
  replace: true,
  name: 'vue-draggable-resizable',
  props: {
    className: {
      type: String,
      default: 'vdr'
    },
    classNameDraggable: {
      type: String,
      default: 'draggable'
    },
    classNameResizable: {
      type: String,
      default: 'resizable'
    },
    classNameDragging: {
      type: String,
      default: 'dragging'
    },
    classNameResizing: {
      type: String,
      default: 'resizing'
    },
    classNameActive: {
      type: String,
      default: 'active'
    },
    classNameHandle: {
      type: String,
      default: 'handle'
    },
    disableUserSelect: {
      type: Boolean,
      default: true
    },
    enableNativeDrag: {
      type: Boolean,
      default: false
    },
    preventDeactivation: {
      type: Boolean,
      default: false
    },
    active: {
      type: Boolean,
      default: false
    },
    draggable: {
      type: Boolean,
      default: true
    },
    resizable: {
      type: Boolean,
      default: true
    },
    // 锁定宽高比
    lockAspectRatio: {
      type: Boolean,
      default: false
    },
    w: {
      type: [Number, String],
      default: 200,
      validator: val => {
        if (typeof val === 'number') {
          return val > 0;
        }
        return val === 'auto';
      }
    },
    h: {
      type: [Number, String],
      default: 200,
      validator: val => {
        if (typeof val === 'number') {
          return val > 0;
        }
        return val === 'auto';
      }
    },
    minWidth: {
      type: Number,
      default: 0,
      validator: val => val >= 0
    },
    minHeight: {
      type: Number,
      default: 0,
      validator: val => val >= 0
    },
    maxWidth: {
      type: Number,
      default: null,
      validator: val => val >= 0
    },
    maxHeight: {
      type: Number,
      default: null,
      validator: val => val >= 0
    },
    x: {
      type: Number,
      default: 0
    },
    y: {
      type: Number,
      default: 0
    },
    z: {
      type: [String, Number],
      default: 'auto',
      validator: val => (typeof val === 'string' ? val === 'auto' : val >= 0)
    },
    handles: {
      type: Array,
      default: () => ['tl', 'tm', 'tr', 'mr', 'br', 'bm', 'bl', 'ml'],
      validator: val => {
        const s = new Set(['tl', 'tm', 'tr', 'mr', 'br', 'bm', 'bl', 'ml']);
        return new Set(val.filter(h => s.has(h))).size === val.length;
      }
    },
    dragHandle: {
      type: String,
      default: null
    },
    dragCancel: {
      type: String,
      default: null
    },
    axis: {
      type: String,
      default: 'both',
      validator: val => ['x', 'y', 'both'].includes(val)
    },
    grid: {
      type: Array,
      default: () => [1, 1]
    },
    parent: {
      type: [Boolean, String],
      default: false
    },
    onDragStart: {
      type: Function,
      default: () => true
    },
    onDrag: {
      type: Function,
      default: () => true
    },
    onResizeStart: {
      type: Function,
      default: () => true
    },
    onResize: {
      type: Function,
      default: () => true
    },
    // 冲突检测
    isConflictCheck: {
      type: Boolean,
      default: false
    },
    // 元素对齐
    snap: {
      type: Boolean,
      default: false
    },
    // 新增 是否对齐容器边界
    snapBorder: {
      type: Boolean,
      default: false
    },
    // 当调用对齐时，用来设置组件与组件之间的对齐距离，以像素为单位
    snapTolerance: {
      type: Number,
      default: 5,
      validator: function (val) {
        return typeof val === 'number';
      }
    },
    // 缩放比例
    scaleRatio: {
      type: Number,
      default: 1,
      validator: val => typeof val === 'number'
    },
    // handle是否缩放
    handleInfo: {
      type: Object,
      default: () => {
        return {
          size: 8,
          offset: -4,
          switch: true
        };
      }
    }
  },

  data: function () {
    return {
      left: this.x,
      top: this.y,
      right: null,
      bottom: null,

      width: null,
      height: null,
      widthTouched: false,
      heightTouched: false,
      // 纵横比变量
      aspectFactor: null,
      // 容器的大小
      parentWidth: null,
      parentHeight: null,
      // 设置最小和最大尺寸
      minW: this.minWidth,
      minH: this.minHeight,

      maxW: this.maxWidth,
      maxH: this.maxHeight,
      // 定义控制手柄
      handle: null,
      enabled: this.active,
      resizing: false,
      dragging: false,
      zIndex: this.z
    };
  },

  created: function () {
    if (this.maxWidth && this.minWidth > this.maxWidth) console.warn('[Vdr warn]: Invalid prop: minWidth cannot be greater than maxWidth');
    if (this.maxWidth && this.minHeight > this.maxHeight) console.warn('[Vdr warn]: Invalid prop: minHeight cannot be greater than maxHeight');

    this.resetBoundsAndMouseState();
  },
  mounted: function () {
    if (!this.enableNativeDrag) {
      this.$el.ondragstart = () => false;
    }

    const [parentWidth, parentHeight] = this.getParentSize();

    this.parentWidth = parentWidth;
    this.parentHeight = parentHeight;
    const [width, height] = getComputedSize(this.$el);
    this.aspectFactor = (this.w !== 'auto' ? this.w : width) / (this.h !== 'auto' ? this.h : height);
    this.width = this.w !== 'auto' ? this.w : width;
    this.height = this.h !== 'auto' ? this.h : height;
    this.right = this.parentWidth - this.width - this.left;
    this.bottom = this.parentHeight - this.height - this.top;

    this.settingAttribute();

    addEvent(document.documentElement, 'mousedown', this.deselect);
    addEvent(document.documentElement, 'touchend touchcancel', this.deselect);

    addEvent(window, 'resize', this.checkParentSize);
  },
  beforeDestroy: function () {
    removeEvent(document.documentElement, 'mousedown', this.deselect);
    removeEvent(document.documentElement, 'touchstart', this.handleUp);
    removeEvent(document.documentElement, 'mousemove', this.move);
    removeEvent(document.documentElement, 'touchmove', this.move);
    removeEvent(document.documentElement, 'mouseup', this.handleUp);
    removeEvent(document.documentElement, 'touchend touchcancel', this.deselect);

    removeEvent(window, 'resize', this.checkParentSize);
  },

  methods: {
    // 重置边界和鼠标状态
    resetBoundsAndMouseState() {
      this.mouseClickPosition = { mouseX: 0, mouseY: 0, x: 0, y: 0, w: 0, h: 0 };

      this.bounds = {
        minLeft: null,
        maxLeft: null,
        minRight: null,
        maxRight: null,
        minTop: null,
        maxTop: null,
        minBottom: null,
        maxBottom: null
      };
    },
    // 检查父元素大小
    checkParentSize() {
      if (this.parent) {
        const [newParentWidth, newParentHeight] = this.getParentSize();
        // 修复父元素改变大小后，组件resizing时活动异常
        this.right = newParentWidth - this.width - this.left;
        this.bottom = newParentHeight - this.height - this.top;

        this.parentWidth = newParentWidth;
        this.parentHeight = newParentHeight;
      }
    },
    // 获取父元素大小
    getParentSize() {
      if (this.parent === true) {
        const style = window.getComputedStyle(this.$el.parentNode, null);
        return [Math.round(parseFloat(style.getPropertyValue('width'), 10)), Math.round(parseFloat(style.getPropertyValue('height'), 10))];
      }
      if (typeof this.parent === 'string') {
        const parentNode = document.querySelector(this.parent);
        if (!(parentNode instanceof HTMLElement)) {
          throw new Error(`The selector ${this.parent} does not match any element`);
        }
        return [parentNode.offsetWidth, parentNode.offsetHeight];
      }

      return [null, null];
    },
    // 元素触摸按下
    elementTouchDown(e) {
      eventsFor = events.touch;

      this.elementDown(e);
    },
    elementMouseDown(e) {
      eventsFor = events.mouse;
      this.elementDown(e);
    },
    // 元素按下
    elementDown(e) {
      if (e instanceof MouseEvent && e.which !== 1) {
        return;
      }

      const target = e.target || e.srcElement;

      if (this.$el.contains(target)) {
        if (this.onDragStart(e) === false) {
          return;
        }
        if (
          (this.dragHandle && !matchesSelectorToParentElements(target, this.dragHandle, this.$el)) ||
          (this.dragCancel && matchesSelectorToParentElements(target, this.dragCancel, this.$el))
        ) {
          this.dragging = false;

          return;
        }

        if (!this.enabled) {
          this.enabled = true;

          this.$emit('activated');
          this.$emit('update:active', true);
        }

        if (this.draggable) {
          this.dragging = true;
        }

        this.mouseClickPosition.mouseX = e.touches ? e.touches[0].pageX : e.pageX;
        this.mouseClickPosition.mouseY = e.touches ? e.touches[0].pageY : e.pageY;

        this.mouseClickPosition.left = this.left;
        this.mouseClickPosition.right = this.right;
        this.mouseClickPosition.top = this.top;
        this.mouseClickPosition.bottom = this.bottom;
        this.mouseClickPosition.w = this.width;
        this.mouseClickPosition.h = this.height;

        if (this.parent) {
          this.bounds = this.calcDragLimits();
        }

        addEvent(document.documentElement, eventsFor.move, this.move);
        addEvent(document.documentElement, eventsFor.stop, this.handleUp);
      }
    },
    // 计算移动范围
    calcDragLimits() {
      return {
        minLeft: this.left % this.grid[0],
        maxLeft: Math.floor((this.parentWidth - this.width - this.left) / this.grid[0]) * this.grid[0] + this.left,
        minRight: this.right % this.grid[0],
        maxRight: Math.floor((this.parentWidth - this.width - this.right) / this.grid[0]) * this.grid[0] + this.right,
        minTop: this.top % this.grid[1],
        maxTop: Math.floor((this.parentHeight - this.height - this.top) / this.grid[1]) * this.grid[1] + this.top,
        minBottom: this.bottom % this.grid[1],
        maxBottom: Math.floor((this.parentHeight - this.height - this.bottom) / this.grid[1]) * this.grid[1] + this.bottom
      };
    },
    // 取消
    deselect(e) {
      const target = e.target || e.srcElement;
      const regex = new RegExp(this.className + '-([trmbl]{2})', '');

      if (!this.$el.contains(target) && !regex.test(target.className)) {
        if (this.enabled && !this.preventDeactivation) {
          this.enabled = false;
          this.$emit('deactivated');
          this.$emit('update:active', false);
        }

        removeEvent(document.documentElement, eventsFor.move, this.move);
      }

      this.resetBoundsAndMouseState();
    },
    // 控制柄触摸按下
    handleTouchDown(handle, e) {
      eventsFor = events.touch;

      this.handleDown(handle, e);
    },
    // 控制柄按下
    handleDown(handle, e) {
      if (e instanceof MouseEvent && e.which !== 1) {
        return;
      }

      if (this.onResizeStart(handle, e) === false) {
        return;
      }

      if (e.stopPropagation) e.stopPropagation();

      if (this.lockAspectRatio && !handle.includes('m')) {
        this.handle = 'm' + handle.substring(1);
      } else {
        this.handle = handle;
      }
      this.resizing = true;

      this.mouseClickPosition.mouseX = e.touches ? e.touches[0].pageX : e.pageX;
      this.mouseClickPosition.mouseY = e.touches ? e.touches[0].pageY : e.pageY;
      this.mouseClickPosition.left = this.left;
      this.mouseClickPosition.right = this.right;
      this.mouseClickPosition.top = this.top;
      this.mouseClickPosition.bottom = this.bottom;
      this.mouseClickPosition.w = this.width;
      this.mouseClickPosition.h = this.height;

      this.bounds = this.calcResizeLimits();

      addEvent(document.documentElement, eventsFor.move, this.move);
      addEvent(document.documentElement, eventsFor.stop, this.handleUp);
    },
    // 计算调整大小范围
    calcResizeLimits() {
      let minW = this.minW;
      let minH = this.minH;
      let maxW = this.maxW;
      let maxH = this.maxH;

      const aspectFactor = this.aspectFactor;
      const [gridX, gridY] = this.grid;
      const width = this.width;
      const height = this.height;
      const left = this.left;
      const top = this.top;
      const right = this.right;
      const bottom = this.bottom;

      if (this.lockAspectRatio) {
        if (minW / minH > aspectFactor) {
          minH = minW / aspectFactor;
        } else {
          minW = aspectFactor * minH;
        }

        if (maxW && maxH) {
          maxW = Math.min(maxW, aspectFactor * maxH);
          maxH = Math.min(maxH, maxW / aspectFactor);
        } else if (maxW) {
          maxH = maxW / aspectFactor;
        } else if (maxH) {
          maxW = aspectFactor * maxH;
        }
      }

      maxW = maxW - (maxW % gridX);
      maxH = maxH - (maxH % gridY);

      const limits = {
        minLeft: null,
        maxLeft: null,
        minTop: null,
        maxTop: null,
        minRight: null,
        maxRight: null,
        minBottom: null,
        maxBottom: null
      };

      if (this.parent) {
        limits.minLeft = left % gridX;
        limits.maxLeft = left + Math.floor((width - minW) / gridX) * gridX;
        limits.minTop = top % gridY;
        limits.maxTop = top + Math.floor((height - minH) / gridY) * gridY;
        limits.minRight = right % gridX;
        limits.maxRight = right + Math.floor((width - minW) / gridX) * gridX;
        limits.minBottom = bottom % gridY;
        limits.maxBottom = bottom + Math.floor((height - minH) / gridY) * gridY;

        if (maxW) {
          limits.minLeft = Math.max(limits.minLeft, this.parentWidth - right - maxW);
          limits.minRight = Math.max(limits.minRight, this.parentWidth - left - maxW);
        }

        if (maxH) {
          limits.minTop = Math.max(limits.minTop, this.parentHeight - bottom - maxH);
          limits.minBottom = Math.max(limits.minBottom, this.parentHeight - top - maxH);
        }

        if (this.lockAspectRatio) {
          limits.minLeft = Math.max(limits.minLeft, left - top * aspectFactor);
          limits.minTop = Math.max(limits.minTop, top - left / aspectFactor);
          limits.minRight = Math.max(limits.minRight, right - bottom * aspectFactor);
          limits.minBottom = Math.max(limits.minBottom, bottom - right / aspectFactor);
        }
      } else {
        limits.minLeft = null;
        limits.maxLeft = left + Math.floor((width - minW) / gridX) * gridX;
        limits.minTop = null;
        limits.maxTop = top + Math.floor((height - minH) / gridY) * gridY;
        limits.minRight = null;
        limits.maxRight = right + Math.floor((width - minW) / gridX) * gridX;
        limits.minBottom = null;
        limits.maxBottom = bottom + Math.floor((height - minH) / gridY) * gridY;

        if (maxW) {
          limits.minLeft = -(right + maxW);
          limits.minRight = -(left + maxW);
        }

        if (maxH) {
          limits.minTop = -(bottom + maxH);
          limits.minBottom = -(top + maxH);
        }

        if (this.lockAspectRatio && (maxW && maxH)) {
          limits.minLeft = Math.min(limits.minLeft, -(right + maxW));
          limits.minTop = Math.min(limits.minTop, -(maxH + bottom));
          limits.minRight = Math.min(limits.minRight, -left - maxW);
          limits.minBottom = Math.min(limits.minBottom, -top - maxH);
        }
      }

      return limits;
    },
    // 移动
    move(e) {
      if (this.resizing) {
        this.handleResize(e);
      } else if (this.dragging) {
        this.handleDrag(e);
      }
    },
    // 元素移动
    async handleDrag(e) {
      const axis = this.axis;
      const grid = this.grid;
      const bounds = this.bounds;
      const mouseClickPosition = this.mouseClickPosition;

      const tmpDeltaX = axis && axis !== 'y' ? mouseClickPosition.mouseX - (e.touches ? e.touches[0].pageX : e.pageX) : 0;
      const tmpDeltaY = axis && axis !== 'x' ? mouseClickPosition.mouseY - (e.touches ? e.touches[0].pageY : e.pageY) : 0;
      const [deltaX, deltaY] = snapToGrid(grid, tmpDeltaX, tmpDeltaY, this.scaleRatio);

      const left = restrictToBounds(mouseClickPosition.left - deltaX, bounds.minLeft, bounds.maxLeft);
      const top = restrictToBounds(mouseClickPosition.top - deltaY, bounds.minTop, bounds.maxTop);
      if (this.onDrag(left, top) === false) {
        return;
      }
      const right = restrictToBounds(mouseClickPosition.right + deltaX, bounds.minRight, bounds.maxRight);
      const bottom = restrictToBounds(mouseClickPosition.bottom + deltaY, bounds.minBottom, bounds.maxBottom);
      this.left = left;
      this.top = top;
      this.right = right;
      this.bottom = bottom;
      await this.snapCheck();
      this.$emit('dragging', this.left, this.top);
    },
    moveHorizontally(val) {
      const [deltaX, _] = snapToGrid(this.grid, val, this.top, this.scale); // eslint-disable-line no-unused-vars
      const left = restrictToBounds(deltaX, this.bounds.minLeft, this.bounds.maxLeft);
      this.left = left;
      this.right = this.parentWidth - this.width - left;
    },
    moveVertically(val) {
      const [_, deltaY] = snapToGrid(this.grid, this.left, val, this.scale); // eslint-disable-line no-unused-vars
      const top = restrictToBounds(deltaY, this.bounds.minTop, this.bounds.maxTop);
      this.top = top;
      this.bottom = this.parentHeight - this.height - top;
    },
    // 控制柄移动
    handleResize(e) {
      let left = this.left;
      let top = this.top;
      let right = this.right;
      let bottom = this.bottom;

      const mouseClickPosition = this.mouseClickPosition;
      const aspectFactor = this.aspectFactor;

      const tmpDeltaX = mouseClickPosition.mouseX - (e.touches ? e.touches[0].pageX : e.pageX);
      const tmpDeltaY = mouseClickPosition.mouseY - (e.touches ? e.touches[0].pageY : e.pageY);

      if (!this.widthTouched && tmpDeltaX) {
        this.widthTouched = true;
      }
      if (!this.heightTouched && tmpDeltaY) {
        this.heightTouched = true;
      }

      const [deltaX, deltaY] = snapToGrid(this.grid, tmpDeltaX, tmpDeltaY, this.scaleRatio);

      if (this.handle.includes('b')) {
        bottom = restrictToBounds(mouseClickPosition.bottom + deltaY, this.bounds.minBottom, this.bounds.maxBottom);
        if (this.lockAspectRatio && this.resizingOnY) {
          right = this.right - (this.bottom - bottom) * aspectFactor;
        }
      } else if (this.handle.includes('t')) {
        top = restrictToBounds(mouseClickPosition.top - deltaY, this.bounds.minTop, this.bounds.maxTop);
        if (this.lockAspectRatio && this.resizingOnY) {
          left = this.left - (this.top - top) * aspectFactor;
        }
      }

      if (this.handle.includes('r')) {
        right = restrictToBounds(mouseClickPosition.right + deltaX, this.bounds.minRight, this.bounds.maxRight);
        if (this.lockAspectRatio && this.resizingOnX) {
          bottom = this.bottom - (this.right - right) / aspectFactor;
        }
      } else if (this.handle.includes('l')) {
        left = restrictToBounds(mouseClickPosition.left - deltaX, this.bounds.minLeft, this.bounds.maxLeft);
        if (this.lockAspectRatio && this.resizingOnX) {
          top = this.top - (this.left - left) / aspectFactor;
        }
      }

      const width = computeWidth(this.parentWidth, left, right);
      const height = computeHeight(this.parentHeight, top, bottom);
      if (this.onResize(this.handle, left, top, width, height) === false) {
        return;
      }
      this.left = left;
      this.top = top;
      this.right = right;
      this.bottom = bottom;
      this.width = width;
      this.height = height;
      this.snapCheck(false)
      this.$emit('resizing', this.left, this.top, this.width, this.height);
    },
    changeWidth(val) {
      const [newWidth, _] = snapToGrid(this.grid, val, 0, this.scale); // eslint-disable-line no-unused-vars
      const right = restrictToBounds(this.parentWidth - newWidth - this.left, this.bounds.minRight, this.bounds.maxRight);
      let bottom = this.bottom;
      if (this.lockAspectRatio) {
        bottom = this.bottom - (this.right - right) / this.aspectFactor;
      }
      const width = computeWidth(this.parentWidth, this.left, right);
      const height = computeHeight(this.parentHeight, this.top, bottom);
      this.right = right;
      this.bottom = bottom;
      this.width = width;
      this.height = height;
    },
    changeHeight(val) {
      const [_, newHeight] = snapToGrid(this.grid, 0, val, this.scale); // eslint-disable-line no-unused-vars

      const bottom = restrictToBounds(this.parentHeight - newHeight - this.top, this.bounds.minBottom, this.bounds.maxBottom);
      let right = this.right;
      if (this.lockAspectRatio) {
        right = this.right - (this.bottom - bottom) * this.aspectFactor;
      }
      const width = computeWidth(this.parentWidth, this.left, right);
      const height = computeHeight(this.parentHeight, this.top, bottom);
      this.right = right;
      this.bottom = bottom;
      this.width = width;
      this.height = height;
    },
    // 从控制柄松开
    async handleUp(e) {
      this.handle = null;

      // 初始化辅助线数据
      const temArr = new Array(3).fill({ display: false, position: '', origin: '', lineLength: '' });
      const refLine = { vLine: [], hLine: [] };
      for (const i in refLine) {
        refLine[i] = JSON.parse(JSON.stringify(temArr));
      }

      if (this.resizing) {
        this.resizing = false;
        await this.conflictCheck();
        this.$emit('refLineParams', refLine);
        this.$emit('resizestop', this.left, this.top, this.width, this.height);
      }
      if (this.dragging) {
        this.dragging = false;
        await this.conflictCheck();
        this.$emit('refLineParams', refLine);
        this.$emit('dragstop', this.left, this.top);
      }
      this.resetBoundsAndMouseState();
      removeEvent(document.documentElement, eventsFor.move, this.move);
    },
    // 新增方法 ↓↓↓
    // 设置属性
    settingAttribute() {
      // 设置冲突检测
      this.$el.setAttribute('data-is-check', `${this.isConflictCheck}`);
      // 设置对齐元素
      this.$el.setAttribute('data-is-snap', `${this.snap}`);
    },
    // 冲突检测
    conflictCheck() {
      const top = this.top;
      const left = this.left;
      const width = this.width;
      const height = this.height;

      if (this.isConflictCheck) {
        const nodes = this.$el.parentNode.childNodes; // 获取当前父节点下所有子节点
        for (const item of nodes) {
          if (
            item.className !== undefined &&
            !item.className.includes(this.classNameActive) &&
            item.getAttribute('data-is-check') !== null &&
            item.getAttribute('data-is-check') !== 'false'
          ) {
            const tw = item.offsetWidth;
            const th = item.offsetHeight;
            // 正则获取left与right
            const [tl, tt] = this.formatTransformVal(item.style.transform);

            // 左上角与右下角重叠
            const tfAndBr = (top >= tt && left >= tl && tt + th > top && tl + tw > left) || (top <= tt && left < tl && top + height > tt && left + width > tl);
            // 右上角与左下角重叠
            const brAndTf = (left <= tl && top >= tt && left + width > tl && top < tt + th) || (top < tt && left > tl && top + height > tt && left < tl + tw);
            // 下边与上边重叠
            const bAndT = (top <= tt && left >= tl && top + height > tt && left < tl + tw) || (top >= tt && left <= tl && top < tt + th && left > tl + tw);
            // 上边与下边重叠（宽度不一样）
            const tAndB = (top <= tt && left >= tl && top + height > tt && left < tl + tw) || (top >= tt && left <= tl && top < tt + th && left > tl + tw);
            // 左边与右边重叠
            const lAndR = (left >= tl && top >= tt && left < tl + tw && top < tt + th) || (top > tt && left <= tl && left + width > tl && top < tt + th);
            // 左边与右边重叠（高度不一样）
            const rAndL = (top <= tt && left >= tl && top + height > tt && left < tl + tw) || (top >= tt && left <= tl && top < tt + th && left + width > tl);

            // 如果冲突，就将回退到移动前的位置
            if (tfAndBr || brAndTf || bAndT || tAndB || lAndR || rAndL) {
              this.top = this.mouseClickPosition.top;
              this.left = this.mouseClickPosition.left;
              this.right = this.mouseClickPosition.right;
              this.bottom = this.mouseClickPosition.bottom;
              this.width = this.mouseClickPosition.w;
              this.height = this.mouseClickPosition.h;
            }
          }
        }
      }
    },
    // 检测对齐元素
    async snapCheck(flag = true) {
      let width = this.width;
      let height = this.height;
      if (this.snap) {
        let activeLeft = this.left;
        let activeRight = this.left + width;
        let activeTop = this.top;
        let activeBottom = this.top + height;

        // 初始化辅助线数据
        const temArr = new Array(3).fill({ display: false, position: '', origin: '', lineLength: '' });
        const refLine = { vLine: [], hLine: [] };
        for (const i in refLine) {
          refLine[i] = JSON.parse(JSON.stringify(temArr));
        }
        const tem = {
          value: { x: [[], [], []], y: [[], [], []] },
          display: [],
          position: []
        };
        // 获取当前父节点下所有子节点
        const nodes = this.$el.parentNode.childNodes;
        const { groupWidth, groupHeight, groupLeft, groupTop, bln } = await this.getActiveAll(nodes);
        if (!bln) {
          width = groupWidth;
          height = groupHeight;
          activeLeft = groupLeft;
          activeRight = groupLeft + groupWidth;
          activeTop = groupTop;
          activeBottom = groupTop + groupHeight;
        }
        for (const item of nodes) {
          if (
            item.className !== undefined &&
            !item.className.includes(this.classNameActive) &&
            item.getAttribute('data-is-snap') !== null &&
            item.getAttribute('data-is-snap') !== 'false'
          ) {
            const w = item.offsetWidth;
            const h = item.offsetHeight;
            const [l, t] = this.formatTransformVal(item.style.transform);
            const r = l + w; // 对齐目标right
            const b = t + h; // 对齐目标的bottom

            const hc = Math.abs(activeTop + height / 2 - (t + h / 2)) <= this.snapTolerance; // 水平中线
            const vc = Math.abs(activeLeft + width / 2 - (l + w / 2)) <= this.snapTolerance; // 垂直中线

            const ts = Math.abs(t - activeBottom) <= this.snapTolerance; // 从上到下
            const TS = Math.abs(b - activeBottom) <= this.snapTolerance; // 从上到下
            const bs = Math.abs(t - activeTop) <= this.snapTolerance; // 从下到上
            const BS = Math.abs(b - activeTop) <= this.snapTolerance; // 从下到上

            const ls = Math.abs(l - activeRight) <= this.snapTolerance; // 外左
            const LS = Math.abs(r - activeRight) <= this.snapTolerance; // 外左
            const rs = Math.abs(l - activeLeft) <= this.snapTolerance; // 外右
            const RS = Math.abs(r - activeLeft) <= this.snapTolerance; // 外右

            tem.display = [ts, TS, bs, BS, hc, hc, ls, LS, rs, RS, vc, vc];
            tem.position = [t, b, t, b, t + h / 2, t + h / 2, l, r, l, r, l + w / 2, l + w / 2];
            if (bln) {
              if (ts) {
                if (flag) {
                  this.top = t - height
                  this.bottom = this.parentHeight - this.top - height
                }
                tem.value.y[0].push(l, r, activeLeft, activeRight);
              }
              if (bs) {
                if (flag) {
                  this.top = t
                  this.bottom = this.parentHeight - this.top - height
                }
                tem.value.y[0].push(l, r, activeLeft, activeRight);
              }

              if (TS) {
                if (flag) {
                  this.top = b - height
                  this.bottom = this.parentHeight - this.top - height
                }
                tem.value.y[1].push(l, r, activeLeft, activeRight);
              }
              if (BS) {
                if (flag) {
                  this.top = b
                  this.bottom = this.parentHeight - this.top - height
                }

                tem.value.y[1].push(l, r, activeLeft, activeRight);
              }

              if (ls) {
                if (flag) {
                  this.left = l - width
                  this.right = this.parentWidth - this.left - width
                }

                tem.value.x[0].push(t, b, activeTop, activeBottom);
              }
              if (rs) {
                if (flag) {
                  this.left = l
                  this.right = this.parentWidth - this.left - width
                }

                tem.value.x[0].push(t, b, activeTop, activeBottom);
              }
              if (LS) {
                if (flag) {
                  this.left = r - width
                  this.right = this.parentWidth - this.left - width
                }

                tem.value.x[1].push(t, b, activeTop, activeBottom);
              }
              if (RS) {
                if (flag) {
                  this.left = r
                  this.right = this.parentWidth - this.left - width
                }

                tem.value.x[1].push(t, b, activeTop, activeBottom);
              }
              if (hc) {
                if (flag) {
                  this.top = t + h / 2 - height / 2
                  this.bottom = this.parentHeight - this.top - height
                }

                tem.value.y[2].push(l, r, activeLeft, activeRight);
              }
              if (vc) {
                if (flag) {
                  this.left = l + w / 2 - width / 2
                  this.right = this.parentWidth - this.left - width
                }

                tem.value.x[2].push(t, b, activeTop, activeBottom);
              }
              // 和容器贴边
              if (this.snapBorder) {
                if (Math.abs(this.left - 0) <= this.snapTolerance) {
                  this.left = 0
                  this.right = this.parentWidth - this.left - width
                }
                if (Math.abs(this.right - 0) <= this.snapTolerance) {
                  this.right = 0
                  this.left = this.parentWidth - this.width - this.right
                }
                if (Math.abs(this.top - 0) <= this.snapTolerance) {
                  this.top = 0
                  this.bottom = this.parentHeight - this.top - height
                }
                if (Math.abs(this.bottom - 0) <= this.snapTolerance) {
                  this.bottom = 0
                  this.top = this.parentHeight - this.bottom - height
                }
              }
            }
            // 再次进行边界处理
            let bounds = this.bounds
            this.left = restrictToBounds(this.left, bounds.minLeft, bounds.maxLeft);
            this.top = restrictToBounds(this.top, bounds.minTop, bounds.maxTop);
            this.right = restrictToBounds(this.right, bounds.minRight, bounds.maxRight);
            this.bottom = restrictToBounds(this.bottom, bounds.minBottom, bounds.maxBottom);

            // 辅助线坐标与是否显示(display)对应的数组,易于循环遍历
            const arrTem = [0, 1, 0, 1, 2, 2, 0, 1, 0, 1, 2, 2];
            for (let i = 0; i <= arrTem.length; i++) {
              // 前6为Y辅助线,后6为X辅助线
              const xory = i < 6 ? 'y' : 'x';
              const horv = i < 6 ? 'hLine' : 'vLine';
              if (tem.display[i]) {
                const { origin, length } = this.calcLineValues(tem.value[xory][arrTem[i]]);
                refLine[horv][arrTem[i]].display = tem.display[i];
                refLine[horv][arrTem[i]].position = tem.position[i] + 'px';
                refLine[horv][arrTem[i]].origin = origin;
                refLine[horv][arrTem[i]].lineLength = length;
              }
            }
          }
        }
        this.$emit('refLineParams', refLine);
      }
    },
    calcLineValues(arr) {
      const length = Math.max(...arr) - Math.min(...arr) + 'px';
      const origin = Math.min(...arr) + 'px';
      return { length, origin };
    },
    async getActiveAll(nodes) {
      const activeAll = [];
      const XArray = [];
      const YArray = [];
      let groupWidth = 0;
      let groupHeight = 0;
      let groupLeft = 0;
      let groupTop = 0;
      for (const item of nodes) {
        if (item.className !== undefined && item.className.includes(this.classNameActive)) {
          activeAll.push(item);
        }
      }
      const AllLength = activeAll.length;
      if (AllLength > 1) {
        for (const i of activeAll) {
          const l = i.offsetLeft;
          const r = l + i.offsetWidth;
          const t = i.offsetTop;
          const b = t + i.offsetHeight;
          XArray.push(l, r);
          YArray.push(t, b);
        }
        groupWidth = Math.max(...XArray) - Math.min(...XArray)
        groupHeight = Math.max(...YArray) - Math.min(...YArray)
        groupLeft = Math.min(...XArray)
        groupTop = Math.min(...YArray)
      }
      const bln = AllLength === 1;
      return { groupWidth, groupHeight, groupLeft, groupTop, bln };
    },
    // 修复 正则获取left与top
    formatTransformVal(string) {
      let [left, top, rotate] = string.match(/[\d|\.]+/g);
      if (top === undefined) top = 0;
      return [Number(left), Number(top), rotate];
    }
  },
  computed: {
    handleStyle() {
      return stick => {
        if (!this.handleInfo.switch) return { display: this.enabled ? 'block' : 'none' };

        const size = (this.handleInfo.size / this.scaleRatio).toFixed(2);
        const offset = (this.handleInfo.offset / this.scaleRatio).toFixed(2);
        const center = (size / 2).toFixed(2);

        const styleMap = {
          tl: {
            top: `${offset}px`,
            left: `${offset}px`
          },
          tm: {
            top: `${offset}px`,
            left: `calc(50% - ${center}px)`
          },
          tr: {
            top: `${offset}px`,
            right: `${offset}px`
          },
          mr: {
            top: `calc(50% - ${center}px)`,
            right: `${offset}px`
          },
          br: {
            bottom: `${offset}px`,
            right: `${offset}px`
          },
          bm: {
            bottom: `${offset}px`,
            right: `calc(50% - ${center}px)`
          },
          bl: {
            bottom: `${offset}px`,
            left: `${offset}px`
          },
          ml: {
            top: `calc(50% - ${center}px)`,
            left: `${offset}px`
          }
        };
        const stickStyle = {
          width: `${size}px`,
          height: `${size}px`,
          top: styleMap[stick].top,
          left: styleMap[stick].left,
          right: styleMap[stick].right,
          bottom: styleMap[stick].bottom
        };
        stickStyle.display = this.enabled ? 'block' : 'none';
        return stickStyle;
      };
    },
    style() {
      return {
        transform: `translate(${this.left}px, ${this.top}px)`,
        width: this.computedWidth,
        height: this.computedHeight,
        zIndex: this.zIndex,
        ...(this.dragging && this.disableUserSelect ? userSelectNone : userSelectAuto)
      };
    },
    // 控制柄显示与否
    actualHandles() {
      if (!this.resizable) return [];

      return this.handles;
    },
    //  根据left right 算出元素的宽度
    computedWidth() {
      if (this.w === 'auto') {
        if (!this.widthTouched) {
          return 'auto';
        }
      }
      return this.width + 'px';
    },
    // 根据top bottom 算出元素的宽度
    computedHeight() {
      if (this.h === 'auto') {
        if (!this.heightTouched) {
          return 'auto';
        }
      }
      return this.height + 'px';
    },
    resizingOnX() {
      return Boolean(this.handle) && (this.handle.includes('l') || this.handle.includes('r'));
    },
    resizingOnY() {
      return Boolean(this.handle) && (this.handle.includes('t') || this.handle.includes('b'));
    },
    isCornerHandle() {
      return Boolean(this.handle) && ['tl', 'tr', 'br', 'bl'].includes(this.handle);
    }
  },

  watch: {
    active(val) {
      this.enabled = val;

      if (val) {
        this.$emit('activated');
      } else {
        this.$emit('deactivated');
      }
    },
    z(val) {
      if (val >= 0 || val === 'auto') {
        this.zIndex = val;
      }
    },
    x(val) {
      if (this.resizing || this.dragging) {
        return;
      }
      if (this.parent) {
        this.bounds = this.calcDragLimits();
      }

      this.moveHorizontally(val);
    },
    y(val) {
      if (this.resizing || this.dragging) {
        return;
      }

      if (this.parent) {
        this.bounds = this.calcDragLimits();
      }

      this.moveVertically(val);
    },
    lockAspectRatio(val) {
      if (val) {
        this.aspectFactor = this.width / this.height;
      } else {
        this.aspectFactor = undefined;
      }
    },
    minWidth(val) {
      if (val > 0 && val <= this.width) {
        this.minW = val;
      }
    },
    minHeight(val) {
      if (val > 0 && val <= this.height) {
        this.minH = val;
      }
    },
    maxWidth(val) {
      this.maxW = val;
    },
    maxHeight(val) {
      this.maxH = val;
    },
    w(val) {
      if (this.resizing || this.dragging) {
        return;
      }

      if (this.parent) {
        this.bounds = this.calcResizeLimits();
      }

      this.changeWidth(val);
    },
    h(val) {
      if (this.resizing || this.dragging) {
        return;
      }

      if (this.parent) {
        this.bounds = this.calcResizeLimits();
      }

      this.changeHeight(val);
    }
  }
};
</script>

<style scoped>
.vdr {
  touch-action: none;
  position: absolute;
  box-sizing: border-box;
}
.handle {
  box-sizing: border-box;
  position: absolute;
  background: #ffffff;
  border: 1px solid #333;
}
.handle-tl {
  cursor: nw-resize;
}
.handle-tm {
  cursor: n-resize;
}
.handle-tr {
  cursor: ne-resize;
}
.handle-ml {
  cursor: w-resize;
}
.handle-mr {
  cursor: e-resize;
}
.handle-bl {
  cursor: sw-resize;
}
.handle-bm {
  cursor: s-resize;
}
.handle-br {
  cursor: se-resize;
}
</style>
