@tarojs/components/dist/esm/taro-movable-area-core_2.entry.js

Taro 组件库

import { r as registerInstance, h, g as getElement, H as Host, c as createEvent } from './index-ab3c86da.js';
import { i as isElement } from './index-a00a7418.js';

const areaCss = "taro-movable-area-core{width:10px;height:10px;display:block;position:relative}";

const MovableArea = class {
  constructor(hostRef) {
    registerInstance(this, hostRef);
    /** 子元素集合 */
    this.views = [];
    /** 手势缩放 */
    this.scaleLength = 0;
    this.viewsChanged = () => {
      this.views = [];
      const elements = this.element.querySelectorAll('taro-movable-view-core');
      Array.from(elements).forEach((element) => {
        this.views.push(element);
      });
      this.updateArea();
    };
    this.handleTouchStart = (e) => {
      const touches = e.touches;
      if (!touches || touches.length <= 1) {
        return;
      }
      const gap = {
        width: touches[1].pageX - touches[0].pageX,
        height: touches[1].pageY - touches[0].pageY
      };
      this.scaleLength = Math.sqrt(gap.width * gap.width + gap.height * gap.height);
      if (this.scaleArea) {
        return;
      }
      const find = (target, views) => {
        const loop = (e, t) => {
          if (!(e = e.parentNode)) {
            return false;
          }
          return (!isElement(e) || e !== document.body) && (e === t || e === t.element || e.element === t || loop(e, t));
        };
        for (let i = 0; i < views.length; i++) {
          const view = views[i];
          if (target === view["element"] || loop(target, view)) {
            return view;
          }
        }
      };
      const touch1 = find(touches[0].target, this.views);
      const touch2 = find(touches[1].target, this.views);
      this.scaleTarget = touch1 && touch1 === touch2 ? touch1 : undefined;
    };
    this.handleTouchMove = (e) => {
      const touches = e.touches;
      if (!touches || touches.length <= 1) {
        return;
      }
      e.preventDefault();
      const gap = {
        width: touches[1].pageX - touches[0].pageX,
        height: touches[1].pageY - touches[0].pageY
      };
      if (this.scaleLength > 0) {
        this.updateScale(Math.sqrt(gap.width * gap.width + gap.height * gap.height) / this.scaleLength);
      }
    };
    this.handleTouchEnd = (e) => {
      var _a, _b;
      if ((e.touches && e.touches.length) || !e.changedTouches) {
        return;
      }
      this.scaleLength = 0;
      if (this.scaleArea) {
        this.views.forEach((element) => {
          var _a;
          (_a = element["endScale"]) === null || _a === void 0 ? void 0 : _a.call(element);
        });
      }
      else {
        (_b = (_a = this.scaleTarget) === null || _a === void 0 ? void 0 : _a["endScale"]) === null || _b === void 0 ? void 0 : _b.call(_a);
      }
      this.scaleTarget = undefined;
    };
    this.updateScale = (scale) => {
      var _a, _b;
      if (!scale || scale === 1) {
        return;
      }
      if (this.scaleArea) {
        this.views.forEach((element) => {
          var _a;
          (_a = element["setScale"]) === null || _a === void 0 ? void 0 : _a.call(element, scale);
        });
      }
      else {
        (_b = (_a = this.scaleTarget) === null || _a === void 0 ? void 0 : _a["setScale"]) === null || _b === void 0 ? void 0 : _b.call(_a, scale);
      }
    };
    this.updateArea = () => {
      const computedStyle = window.getComputedStyle(this.element);
      const clientRect = this.element.getBoundingClientRect();
      const horizontal = ["Left", "Right"].map((e) => {
        return parseFloat(computedStyle["border" + e + "Width"]) + parseFloat(computedStyle["padding" + e]);
      });
      const vertical = ["Top", "Bottom"].map((e) => {
        return parseFloat(computedStyle["border" + e + "Width"]) + parseFloat(computedStyle["padding" + e]);
      });
      this.views.forEach((element) => {
        var _a;
        (_a = element["setParent"]) === null || _a === void 0 ? void 0 : _a.call(element, {
          element: this.element,
          area: {
            height: clientRect.height - vertical[0] - vertical[1],
            width: clientRect.width - horizontal[0] - horizontal[1]
          }
        });
      });
    };
    this.scaleArea = undefined;
  }
  connectedCallback() {
    this.observer = new MutationObserver((mutations) => {
      mutations.forEach((mutation) => {
        var _a, _b;
        if (mutation.attributeName === "class" || mutation.attributeName === "style") {
          const offsetWidth = this.element.offsetWidth;
          const offsetHeight = this.element.offsetHeight;
          if (offsetWidth !== ((_a = this.offset) === null || _a === void 0 ? void 0 : _a.width) || offsetHeight !== ((_b = this.offset) === null || _b === void 0 ? void 0 : _b.height)) {
            this.updateArea();
          }
          this.offset = {
            width: offsetWidth,
            height: offsetHeight
          };
        }
      });
    });
    this.observer.observe(this.element, {
      attributes: true
    });
  }
  disconnectedCallback() {
    var _a;
    (_a = this.observer) === null || _a === void 0 ? void 0 : _a.disconnect();
  }
  componentDidLoad() {
    this.viewsChanged();
  }
  render() {
    return (h(Host, { onTouchStart: this.handleTouchStart, onTouchMove: this.handleTouchMove, onTouchEnd: this.handleTouchEnd }));
  }
  get element() { return getElement(this); }
};
MovableArea.style = areaCss;

const viewCss = "taro-movable-view-core{width:10px;height:10px;display:inline-block;position:absolute;top:0;left:0}";

const MovableView = class {
  constructor(hostRef) {
    registerInstance(this, hostRef);
    this.onChange = createEvent(this, "change", 7);
    this.onScale = createEvent(this, "scale", 7);
    this.onHTouchMove = createEvent(this, "htouchmove", 7);
    this.onVTouchMove = createEvent(this, "vtouchmove", 7);
    /** 当前水平偏移 */
    this.translateX = 0;
    /** 当前垂直偏移 */
    this.translateY = 0;
    /** touch-start 原点 */
    this.origin = { x: 0, y: 0 };
    /** 父容器大小 */
    this.area = { width: 0, height: 0 };
    /** 原始缩放倍数 */
    this.originScale = 1;
    /** 当前缩放倍数 */
    this.currentScale = 1;
    /** 宽度 */
    this.width = 0;
    /** 高度 */
    this.height = 0;
    /** 移动边界 */
    this.minX = 0;
    this.minY = 0;
    this.maxX = 0;
    this.maxY = 0;
    /** 移动基础位置 */
    this.baseX = 0;
    this.baseY = 0;
    /** 偏移量 */
    this.offset = { x: 0, y: 0 };
    this.scaleOffset = { x: 0, y: 0 };
    this.getLimitXY = (x, y) => {
      let outOfBounds = false;
      x > this.maxX ? (x = this.maxX, outOfBounds = true) : x < this.minX && (x = this.minX, outOfBounds = true);
      y > this.maxY ? (y = this.maxY, outOfBounds = true) : y < this.minY && (y = this.minY, outOfBounds = true);
      return { x, y, outOfBounds };
    };
    this.animationTo = (x, y, scale, source, noEmitChange, emitScale, callback) => {
      if (this.animation) {
        this.setTransform(x, y, scale, source, noEmitChange, emitScale);
        callback === null || callback === void 0 ? void 0 : callback();
      }
      else {
        this.setTransform(x, y, scale, source, noEmitChange, emitScale);
      }
    };
    this.setTransform = (x, y, scale, source, noEmitChange, emitScale) => {
      x = Number(x.toFixed(1));
      y = Number(y.toFixed(1));
      scale = Number((scale !== null && scale !== void 0 ? scale : this.currentScale).toFixed(3));
      if (!this.outOfBounds) {
        const limit = this.getLimitXY(x, y);
        x = limit.x;
        y = limit.y;
      }
      const subtract = (e, t) => {
        return +((1e3 * e - 1e3 * t) / 1e3).toFixed(1);
      };
      const realX = subtract(x, this.scaleOffset.x);
      const realY = subtract(y, this.scaleOffset.y);
      if (this.translateX !== x || this.translateY !== y) {
        !noEmitChange && this.onChange.emit({
          x: realX,
          y: realY,
          source
        });
      }
      if (scale !== this.currentScale) {
        emitScale && this.onScale.emit({
          scale,
          x: realX,
          y: realY
        });
      }
      const transform = `translateX(${x}px) translateY(${y}px) translateZ(0px) scale(${scale})`;
      this.element.style.transform = transform;
      this.element.style.webkitTransform = transform;
      this.translateX = x;
      this.translateY = y;
      this.currentScale = scale;
    };
    this.updateOffset = () => {
      const offset = (element, parent) => {
        if (element === parent || !element.offsetParent) {
          return { left: 0, top: 0 };
        }
        const current = offset(element.offsetParent, parent);
        return {
          left: element.offsetLeft + current.left,
          top: element.offsetTop + current.top
        };
      };
      if (!this.parent) {
        return;
      }
      const current = offset(this.element, this.parent);
      this.offset.x = current.left;
      this.offset.y = current.top;
    };
    this.updateScaleOffset = (scale = this.currentScale) => {
      const rect = this.element.getBoundingClientRect();
      this.height = rect.height / this.currentScale;
      this.width = rect.width / this.currentScale;
      this.scaleOffset.x = (this.width * scale - this.width) / 2;
      this.scaleOffset.y = (this.height * scale - this.height) / 2;
    };
    this.updateBoundary = () => {
      const x1 = 0 - this.offset.x + this.scaleOffset.x;
      const x2 = this.area.width - this.width - this.offset.x - this.scaleOffset.x;
      this.minX = Math.min(x1, x2);
      this.maxX = Math.max(x1, x2);
      const y1 = 0 - this.offset.y + this.scaleOffset.y;
      const y2 = this.area.height - this.height - this.offset.y - this.scaleOffset.y;
      this.minY = Math.min(y1, y2);
      this.maxY = Math.max(y1, y2);
    };
    this.updateScale = (scale, animation, animationCallback) => {
      if (!this.scale) {
        return;
      }
      const target = this.adjustScale(scale);
      this.updateScaleOffset(target);
      this.updateBoundary();
      const { x, y } = this.getLimitXY(this.translateX, this.translateY);
      if (animation) {
        this.animationTo(x, y, target, "", true, true, animationCallback);
      }
      else if (!this.updating) {
        this.updating = true;
        requestAnimationFrame(() => {
          this.setTransform(x, y, target, "", true, true);
          this.updating = false;
        });
      }
    };
    this.setOriginScale = (scale) => {
      this.originScale = scale;
    };
    this.adjustScale = (scale) => {
      return Math.min(10, this.scaleMax, Math.max(.5, this.scaleMin, scale));
    };
    this.handleTouchStart = (e) => {
      const touches = e.touches;
      if (this.disabled || touches.length > 1 || !this.element) {
        return;
      }
      const touch = touches[0];
      this.touching = true;
      this.firstMoveFireEvent = false;
      this.origin.x = touch.screenX;
      this.origin.y = touch.screenY;
      this.baseX = this.translateX;
      this.baseY = this.translateY;
      this.element.style.willChange = "transform";
    };
    this.handleTouchMove = (e) => {
      const touches = e.touches;
      if (this.disabled || !this.element || this.scaling || !this.touching || touches.length > 1) {
        return;
      }
      if (this.direction !== "horizontal") {
        e.preventDefault();
      }
      const touch = touches[0];
      const x = touch.screenX - this.origin.x;
      const y = touch.screenY - this.origin.y;
      this.setTransform(this.xMove ? (x + this.baseX) : 0, this.yMove ? (y + this.baseY) : 0);
      if (!this.firstMoveFireEvent) {
        this.firstMoveFireEvent = true;
        const onTouchMove = Math.abs(x) > Math.abs(y) ? this.onHTouchMove : this.onVTouchMove;
        onTouchMove.emit({
          originalEvent: e,
          bubbles: false,
          capturePhase: false,
          composed: true,
          extraFields: {
            touches: e.touches || {},
            changedTouches: e.changedTouches || {}
          }
        });
      }
    };
    this.handleTouchEnd = (e) => {
      const touch = e.changedTouches[0];
      if (this.disabled || !this.touching || !touch) {
        return;
      }
      this.touching = false;
      const x = touch.screenX - this.origin.x;
      const y = touch.screenY - this.origin.y;
      this.setTransform(this.xMove ? (x + this.baseX) : 0, this.yMove ? (y + this.baseY) : 0);
    };
    this.x = 0;
    this.y = 0;
    this.direction = "none";
    this.outOfBounds = false;
    this.inertia = false;
    this.friction = 2;
    this.damping = 20;
    this.disabled = false;
    this.scale = false;
    this.scaleMin = .5;
    this.scaleMax = 10;
    this.scaleValue = 1;
    this.animation = true;
  }
  watchX(newValue) {
    this.setTransform(parseFloat(`${newValue || 0}`), this.translateY);
  }
  watchY(newValue) {
    this.setTransform(this.translateX, parseFloat(`${newValue || 0}`));
  }
  watchScaleMinOrMax() {
    if (!this.scale)
      return false;
    this.updateScale(this.currentScale, true);
    this.setOriginScale(this.currentScale);
  }
  watchScaleValue(scale) {
    if (!this.scale) {
      return false;
    }
    this.updateScale(scale, true);
    this.setOriginScale(scale);
    return scale;
  }
  /**
   * 设置父节点
   */
  async setParent({ element, area }) {
    const scale = this.scale ? this.scaleValue : 1;
    this.area = area;
    this.parent = element;
    this.updateOffset();
    this.updateScaleOffset(scale);
    this.updateBoundary();
    this.setTransform(Number(this.x) + this.scaleOffset.x, Number(this.y) + this.scaleOffset.y, scale, "", true);
    this.setOriginScale(scale);
  }
  /**
   * 结束缩放
   */
  async endScale() {
    this.scaling = false;
    this.setOriginScale(this.currentScale);
  }
  /**
   * 更新缩放
   */
  async setScale(scale) {
    if (!this.scale) {
      return;
    }
    this.scaling = true;
    this.updateScale(scale * this.originScale);
  }
  connectedCallback() {
    this.observer = new MutationObserver((mutations) => {
      mutations.forEach((mutation) => {
        const name = mutation.attributeName;
        if (name && ["class", "style"].includes(name)) {
          const oldValue = mutation.oldValue;
          const newValue = mutation.target.getAttribute(name);
          if (oldValue === newValue) {
            return;
          }
          const filter = (input) => {
            return input === null || input === void 0 ? void 0 : input.split(";").filter((item) => {
              return !["transform", "will-change"].find((key) => {
                return item.trim().startsWith(key);
              });
            }).join(";");
          };
          if (name === "style" && filter(newValue) === filter(oldValue)) {
            return;
          }
          this.updateOffset();
          this.updateScaleOffset();
          this.updateBoundary();
          this.setTransform(this.translateX, this.translateY);
        }
      });
    });
    this.observer.observe(this.element, {
      attributes: true,
      attributeOldValue: true
    });
  }
  disconnectedCallback() {
    var _a;
    (_a = this.observer) === null || _a === void 0 ? void 0 : _a.disconnect();
  }
  componentDidLoad() {
    this.element.style.transformOrigin = "center";
    this.xMove = ["horizontal", "all"].includes(this.direction);
    this.yMove = ["vertical", "all"].includes(this.direction);
    if (this.friction <= 0) {
      this.friction = 2;
    }
    if (this.x || this.y) {
      const x = parseFloat(`${this.x || 0}`);
      const y = parseFloat(`${this.y || 0}`);
      this.setTransform(x, y);
    }
  }
  render() {
    return (h(Host, { onTouchStart: this.handleTouchStart, onTouchMove: this.handleTouchMove, onTouchEnd: this.handleTouchEnd }));
  }
  get element() { return getElement(this); }
  static get watchers() { return {
    "x": ["watchX"],
    "y": ["watchY"],
    "scaleMin": ["watchScaleMinOrMax"],
    "scaleMax": ["watchScaleMinOrMax"],
    "scaleValue": ["watchScaleValue"]
  }; }
};
MovableView.style = viewCss;

export { MovableArea as taro_movable_area_core, MovableView as taro_movable_view_core };