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node_modules/vant/es/mixins/touch.js

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+import { on } from '../utils/dom/event';
+
+function getDirection(x, y) {
+  if (x > y) {
+    return 'horizontal';
+  }
+
+  if (y > x) {
+    return 'vertical';
+  }
+
+  return '';
+}
+
+export var TouchMixin = {
+  data: function data() {
+    return {
+      direction: ''
+    };
+  },
+  methods: {
+    touchStart: function touchStart(event) {
+      this.resetTouchStatus();
+      this.startX = event.touches[0].clientX;
+      this.startY = event.touches[0].clientY;
+    },
+    touchMove: function touchMove(event) {
+      var touch = event.touches[0]; // safari back will set clientX to negative number
+
+      this.deltaX = touch.clientX < 0 ? 0 : touch.clientX - this.startX;
+      this.deltaY = touch.clientY - this.startY;
+      this.offsetX = Math.abs(this.deltaX);
+      this.offsetY = Math.abs(this.deltaY); // lock direction when distance is greater than a certain value
+
+      var LOCK_DIRECTION_DISTANCE = 10;
+
+      if (!this.direction || this.offsetX < LOCK_DIRECTION_DISTANCE && this.offsetY < LOCK_DIRECTION_DISTANCE) {
+        this.direction = getDirection(this.offsetX, this.offsetY);
+      }
+    },
+    resetTouchStatus: function resetTouchStatus() {
+      this.direction = '';
+      this.deltaX = 0;
+      this.deltaY = 0;
+      this.offsetX = 0;
+      this.offsetY = 0;
+    },
+    // avoid Vue 2.6 event bubble issues by manually binding events
+    // https://github.com/vant-ui/vant/issues/3015
+    bindTouchEvent: function bindTouchEvent(el) {
+      var onTouchStart = this.onTouchStart,
+          onTouchMove = this.onTouchMove,
+          onTouchEnd = this.onTouchEnd;
+      on(el, 'touchstart', onTouchStart);
+      on(el, 'touchmove', onTouchMove);
+
+      if (onTouchEnd) {
+        on(el, 'touchend', onTouchEnd);
+        on(el, 'touchcancel', onTouchEnd);
+      }
+    }
+  }
+};