[bugfix] ImagePreview: wrong index (#1961)

package.json

@@ -72,7 +72,7 @@
     "@babel/preset-env": "^7.1.0",
     "@vue/server-test-utils": "^1.0.0-beta.25",
     "@vue/test-utils": "^1.0.0-beta.25",
-    "autoprefixer": "^9.1.5",
+    "autoprefixer": "^9.3.0",
     "babel-core": "^7.0.0-0",
     "babel-jest": "^23.6.0",
     "babel-loader": "^8.0.4",
@@ -80,22 +80,22 @@
     "cross-env": "^5.2.0",
     "css-loader": "^1.0.0",
     "dependency-tree": "^6.2.1",
-    "eslint": "^5.6.1",
+    "eslint": "^5.7.0",
     "eslint-plugin-vue-libs": "^3.0.0",
     "fast-glob": "^2.2.3",
     "fast-vue-md-loader": "^1.0.3",
     "gh-pages": "^2.0.1",
     "gulp": "^3.9.1",
-    "gulp-iconfont": "^10.0.1",
+    "gulp-iconfont": "^10.0.2",
     "gulp-iconfont-css": "^2.3.0",
     "html-webpack-plugin": "3.2.0",
-    "husky": "^1.1.1",
+    "husky": "^1.1.2",
     "jest": "^23.6.0",
     "jest-serializer-vue": "^2.0.2",
     "lint-staged": "^7.3.0",
     "md5-file": "^4.0.0",
     "postcss": "^7.0.5",
-    "postcss-calc": "^6.0.2",
+    "postcss-calc": "^7.0.0",
     "postcss-loader": "^3.0.0",
     "precss": "3.1.2",
     "progress-bar-webpack-plugin": "^1.11.0",
@@ -106,17 +106,17 @@
     "stylelint": "^9.6.0",
     "stylelint-config-standard": "^18.2.0",
     "uppercamelcase": "^3.0.0",
-    "url-loader": "^1.1.1",
+    "url-loader": "^1.1.2",
-    "vant-doc": "1.0.17",
+    "vant-doc": "1.0.18",
     "vue": "2.5.17",
-    "vue-jest": "^2.6.0",
+    "vue-jest": "^3.0.0",
     "vue-loader": "^15.4.2",
     "vue-router": "^3.0.1",
     "vue-server-renderer": "^2.5.17",
     "vue-sfc-compiler": "^0.1.3",
     "vue-template-compiler": "2.5.17",
     "vue-template-es2015-compiler": "^1.6.0",
-    "webpack": "^4.20.2",
+    "webpack": "^4.22.0",
     "webpack-cli": "^3.1.2",
     "webpack-serve": "^2.0.2"
   }

packages/image-preview/ImagePreview.vue

@@ -83,7 +83,7 @@ export default create({
       moveY: 0,
       moving: false,
       zooming: false,
-      active: this.startPosition
+      active: 0
     };
   },
 
@@ -108,6 +108,10 @@ export default create({
   },
 
   watch: {
+    value() {
+      this.active = this.startPosition;
+    },
+
     startPosition(active) {
       this.active = active;
     }
@@ -122,7 +126,7 @@ export default create({
       event.preventDefault();
 
       const deltaTime = new Date() - this.touchStartTime;
-      const { offsetX, offsetY } = this.$refs.swipe;
+      const { offsetX = 0, offsetY = 0 } = this.$refs.swipe || {};
 
       // prevent long tap to close component
       if (deltaTime < 300 && offsetX < 10 && offsetY < 10) {
@@ -164,9 +168,10 @@ export default create({
     onTouchStart(event) {
       const { touches } = event;
       const { offsetX } = this.$refs.swipe;
+
       if (touches.length === 1 && this.scale !== 1) {
         this.startMove(event);
-      } else if (touches.length === 2 && !offsetX) {
+      } /* istanbul ignore else */ else if (touches.length === 2 && !offsetX) {
         this.startZoom(event);
       }
     },
@@ -194,6 +199,7 @@ export default create({
     },
 
     onTouchEnd(event) {
+      /* istanbul ignore else */
       if (this.moving || this.zooming) {
         let stopPropagation = true;
 

packages/image-preview/test/__snapshots__/index.spec.js.snap

@@ -19,3 +19,23 @@ exports[`render image 1`] = `
   </div>
 </div>
 `;
+
+exports[`zoom 1`] = `
+<div class="van-image-preview">
+  <div class="van-image-preview__index">1/3</div>
+  <div class="van-swipe">
+    <div class="van-swipe__track" style="width: 300px;">
+      <div class="van-swipe-item" style="width: 100px; height: 100%;">
+        <img src="https://img.yzcdn.cn/1.png" class="van-image-preview__image">
+      </div>
+      <div class="van-swipe-item" style="width: 100px; height: 100%;">
+        <img src="https://img.yzcdn.cn/2.png" class="van-image-preview__image">
+      </div>
+      <div class="van-swipe-item" style="width: 100px; height: 100%;">
+        <img src="https://img.yzcdn.cn/3.png" class="van-image-preview__image">
+      </div>
+    </div>
+    <!---->
+  </div>
+</div>
+`;

packages/image-preview/test/index.spec.js

@@ -1,7 +1,16 @@
 import Vue from 'vue';
 import ImagePreview from '..';
 import ImagePreviewVue from '../ImagePreview';
-import { mount, triggerDrag } from '../../../test/utils';
+import { mount, trigger, triggerDrag } from '../../../test/utils';
+
+function triggerZoom(el, x, y) {
+  trigger(el, 'touchstart', 0, 0, { x, y });
+  trigger(el, 'touchmove', -x / 4, -y / 4, { x, y });
+  trigger(el, 'touchmove', -x / 3, -y / 3, { x, y });
+  trigger(el, 'touchmove', -x / 2, -y / 2, { x, y });
+  trigger(el, 'touchmove', -x, -y, { x, y });
+  trigger(el, 'touchend', 0, 0, { touchList: [] });
+}
 
 const images = [
   'https://img.yzcdn.cn/1.png',
@@ -60,3 +69,18 @@ test('register component', () => {
   Vue.use(ImagePreview);
   expect(Vue.component(ImagePreviewVue.name)).toBeTruthy();
 });
+
+test('zoom', async() => {
+  const getBoundingClientRect = Element.prototype.getBoundingClientRect;
+  Element.prototype.getBoundingClientRect = jest.fn(() => ({ width: 100 }));
+
+  const wrapper = mount(ImagePreviewVue, {
+    propsData: { images, value: true }
+  });
+
+  const image = wrapper.find('img');
+  triggerZoom(image, 300, 300);
+  triggerDrag(image, 300, 300);
+  expect(wrapper).toMatchSnapshot();
+  Element.prototype.getBoundingClientRect = getBoundingClientRect;
+});

test/utils.js

@@ -8,10 +8,8 @@ export {
   mount
 };
 
-// Trigger pointer/touch event
+function getTouch(el, x, y) {
-export function trigger(wrapper, eventName, x = 0, y = 0) {
+  return {
-  const el = wrapper.element ? wrapper.element : wrapper;
-  const touch = {
     identifier: Date.now(),
     target: el,
     pageX: x,
@@ -23,12 +21,22 @@ export function trigger(wrapper, eventName, x = 0, y = 0) {
     rotationAngle: 10,
     force: 0.5
   };
+}
+
+// Trigger pointer/touch event
+export function trigger(wrapper, eventName, x = 0, y = 0, options = {}) {
+  const el = wrapper.element ? wrapper.element : wrapper;
+  const touchList = options.touchList || [getTouch(el, x, y)];
+
+  if (options.x || options.y) {
+    touchList.push(getTouch(el, options.x, options.y));
+  }
 
   const event = document.createEvent('CustomEvent');
   event.initCustomEvent(eventName, true, true, {});
-  event.touches = [touch];
+  event.touches = touchList;
-  event.targetTouches = [touch];
+  event.targetTouches = touchList;
-  event.changedTouches = [touch];
+  event.changedTouches = touchList;
   event.clientX = x;
   event.clientY = y;