lulouis-vant/lib/swipe/index.js

Lightweight Mobile UI Components built on Vue

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

exports.__esModule = true;
exports.default = void 0;

var _utils = require("../utils");

var _touch = _interopRequireDefault(require("../mixins/touch"));

var _event = require("../utils/event");

var _use = (0, _utils.use)('swipe'),
    sfc = _use[0],
    bem = _use[1];

var _default = sfc({
  mixins: [_touch.default],
  props: {
    width: Number,
    height: Number,
    autoplay: Number,
    vertical: Boolean,
    initialSwipe: Number,
    indicatorColor: String,
    loop: {
      type: Boolean,
      default: true
    },
    touchable: {
      type: Boolean,
      default: true
    },
    showIndicators: {
      type: Boolean,
      default: true
    },
    duration: {
      type: Number,
      default: 500
    }
  },
  data: function data() {
    return {
      computedWidth: 0,
      computedHeight: 0,
      offset: 0,
      active: 0,
      deltaX: 0,
      deltaY: 0,
      swipes: [],
      swiping: false
    };
  },
  mounted: function mounted() {
    this.initialize();

    if (!this.$isServer) {
      (0, _event.on)(window, 'resize', this.onResize, true);
    }
  },
  activated: function activated() {
    if (this.rendered) {
      this.initialize();
    }

    this.rendered = true;
  },
  destroyed: function destroyed() {
    this.clear();

    if (!this.$isServer) {
      (0, _event.off)(window, 'resize', this.onResize, true);
    }
  },
  watch: {
    swipes: function swipes() {
      this.initialize();
    },
    initialSwipe: function initialSwipe() {
      this.initialize();
    },
    autoplay: function autoplay(_autoplay) {
      if (!_autoplay) {
        this.clear();
      } else {
        this.autoPlay();
      }
    }
  },
  computed: {
    count: function count() {
      return this.swipes.length;
    },
    delta: function delta() {
      return this.vertical ? this.deltaY : this.deltaX;
    },
    size: function size() {
      return this[this.vertical ? 'computedHeight' : 'computedWidth'];
    },
    trackSize: function trackSize() {
      return this.count * this.size;
    },
    activeIndicator: function activeIndicator() {
      return (this.active + this.count) % this.count;
    },
    isCorrectDirection: function isCorrectDirection() {
      var expect = this.vertical ? 'vertical' : 'horizontal';
      return this.direction === expect;
    },
    trackStyle: function trackStyle() {
      var _ref;

      var mainAxis = this.vertical ? 'height' : 'width';
      var crossAxis = this.vertical ? 'width' : 'height';
      return _ref = {}, _ref[mainAxis] = this.trackSize + "px", _ref[crossAxis] = this[crossAxis] ? this[crossAxis] + "px" : '', _ref.transitionDuration = (this.swiping ? 0 : this.duration) + "ms", _ref.transform = "translate" + (this.vertical ? 'Y' : 'X') + "(" + this.offset + "px)", _ref;
    },
    indicatorStyle: function indicatorStyle() {
      return {
        backgroundColor: this.indicatorColor
      };
    }
  },
  methods: {
    // initialize swipe position
    initialize: function initialize(active) {
      if (active === void 0) {
        active = this.initialSwipe;
      }

      clearTimeout(this.timer);

      if (this.$el) {
        var rect = this.$el.getBoundingClientRect();
        this.computedWidth = this.width || rect.width;
        this.computedHeight = this.height || rect.height;
      }

      this.swiping = true;
      this.active = active;
      this.offset = this.count > 1 ? -this.size * this.active : 0;
      this.swipes.forEach(function (swipe) {
        swipe.offset = 0;
      });
      this.autoPlay();
    },
    onResize: function onResize() {
      this.initialize(this.activeIndicator);
    },
    onTouchStart: function onTouchStart(event) {
      if (!this.touchable) return;
      this.clear();
      this.swiping = true;
      this.touchStart(event);
      this.correctPosition();
    },
    onTouchMove: function onTouchMove(event) {
      if (!this.touchable || !this.swiping) return;
      this.touchMove(event);

      if (this.isCorrectDirection) {
        event.preventDefault();
        event.stopPropagation();
        this.move(0, Math.min(Math.max(this.delta, -this.size), this.size));
      }
    },
    onTouchEnd: function onTouchEnd() {
      if (!this.touchable || !this.swiping) return;

      if (this.delta && this.isCorrectDirection) {
        var offset = this.vertical ? this.offsetY : this.offsetX;
        this.move(offset > 0 ? this.delta > 0 ? -1 : 1 : 0);
      }

      this.swiping = false;
      this.autoPlay();
    },
    move: function move(_move, offset) {
      if (_move === void 0) {
        _move = 0;
      }

      if (offset === void 0) {
        offset = 0;
      }

      var delta = this.delta,
          active = this.active,
          count = this.count,
          swipes = this.swipes,
          trackSize = this.trackSize;
      var atFirst = active === 0;
      var atLast = active === count - 1;
      var outOfBounds = !this.loop && (atFirst && (offset > 0 || _move < 0) || atLast && (offset < 0 || _move > 0));

      if (outOfBounds || count <= 1) {
        return;
      }

      if (swipes[0]) {
        swipes[0].offset = atLast && (delta < 0 || _move > 0) ? trackSize : 0;
      }

      if (swipes[count - 1]) {
        swipes[count - 1].offset = atFirst && (delta > 0 || _move < 0) ? -trackSize : 0;
      }

      if (_move && active + _move >= -1 && active + _move <= count) {
        this.active += _move;
      }

      this.offset = offset - this.active * this.size;
    },
    swipeTo: function swipeTo(index) {
      var _this = this;

      this.swiping = true;
      this.resetTouchStatus();
      this.correctPosition();
      setTimeout(function () {
        _this.swiping = false;

        _this.move(index % _this.count - _this.active);
      }, 30);
    },
    correctPosition: function correctPosition() {
      if (this.active <= -1) {
        this.move(this.count);
      }

      if (this.active >= this.count) {
        this.move(-this.count);
      }
    },
    clear: function clear() {
      clearTimeout(this.timer);
    },
    autoPlay: function autoPlay() {
      var _this2 = this;

      var autoplay = this.autoplay;

      if (autoplay && this.count > 1) {
        this.clear();
        this.timer = setTimeout(function () {
          _this2.swiping = true;

          _this2.resetTouchStatus();

          _this2.correctPosition();

          setTimeout(function () {
            _this2.swiping = false;

            _this2.move(1);

            _this2.autoPlay();
          }, 30);
        }, autoplay);
      }
    },
    onTransitionend: function onTransitionend(event) {
      event.stopPropagation();
      this.$emit('change', this.activeIndicator);
    }
  },
  render: function render(h) {
    var _this3 = this;

    var count = this.count,
        activeIndicator = this.activeIndicator;
    var Indicator = this.$slots.indicator || this.showIndicators && count > 1 && h("div", {
      "class": bem('indicators', {
        vertical: this.vertical
      }),
      "on": {
        "transitionend": _event.stop
      }
    }, [Array.apply(void 0, Array(count)).map(function (empty, index) {
      return h("i", {
        "class": bem('indicator', {
          active: index === activeIndicator
        }),
        "style": index === activeIndicator ? _this3.indicatorStyle : null
      });
    })]);
    return h("div", {
      "class": bem()
    }, [h("div", {
      "style": this.trackStyle,
      "class": bem('track'),
      "on": {
        "touchstart": this.onTouchStart,
        "touchmove": this.onTouchMove,
        "touchend": this.onTouchEnd,
        "touchcancel": this.onTouchEnd,
        "transitionend": this.onTransitionend
      }
    }, [this.$slots.default]), Indicator]);
  }
});

exports.default = _default;