From 5cdf3b1d793751a9e4d8529558c4cbd95955e7ee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BC=A0=E6=95=8F?= <cookfront@gmail.com>
Date: Thu, 15 Mar 2018 10:17:51 +0800
Subject: [PATCH] [new feature] Tabs: support switch tabs with swipe gestrue in
 the content (#694)

---
 docs/demos/views/tab.vue                   |  14 ++++-
 docs/markdown/en-US/tab.md                 |  14 +++++
 docs/markdown/zh-CN/tab.md                 |  13 +++++
 packages/stepper/index.vue                 |   1 +
 packages/tabs/index.vue                    |  58 +++++++++++++++++++--
 packages/vant-css/src/vant-icon-743c0e.ttf | Bin 0 -> 25804 bytes
 test/components/tabs.vue                   |  12 ++++-
 test/specs/tabs.spec.js                    |  33 +++++++++++-
 8 files changed, 137 insertions(+), 8 deletions(-)
 create mode 100644 packages/vant-css/src/vant-icon-743c0e.ttf

diff --git a/docs/demos/views/tab.vue b/docs/demos/views/tab.vue
index f44242dde..743e892bc 100644
--- a/docs/demos/views/tab.vue
+++ b/docs/demos/views/tab.vue
@@ -58,6 +58,14 @@
         </van-tab>
       </van-tabs>
     </demo-block>
+
+    <demo-block :title="$t('title8')">
+      <van-tabs :active="active" swipeable>
+        <van-tab :title="$t('tab') + index" v-for="index in tabs" :key="index">
+          {{ $t('content') }} {{ index }}
+        </van-tab>
+      </van-tabs>
+    </demo-block>
   </demo-section>
 </template>
 
@@ -71,7 +79,8 @@ export default {
       title4: '样式风格',
       title5: '点击事件',
       title6: '粘性布局',
-      title7: '自定义标签'
+      title7: '自定义标签',
+      title8: '滑动切换'
     },
     'en-US': {
       tab: 'Tab ',
@@ -81,7 +90,8 @@ export default {
       title4: 'Card Style',
       title5: 'Click Event',
       title6: 'Sticky',
-      title7: 'Custom Tab'
+      title7: 'Custom Tab',
+      title8: 'Swipeable'
     }
   },
 
diff --git a/docs/markdown/en-US/tab.md b/docs/markdown/en-US/tab.md
index f7d2a4e21..8cdb54a83 100644
--- a/docs/markdown/en-US/tab.md
+++ b/docs/markdown/en-US/tab.md
@@ -124,6 +124,18 @@ Use title slot to custom tab title
 </van-tabs>
 ```
 
+#### Swipeable
+
+In swipeable mode, you can switch tabs with swipe gestrue in the content
+
+```html
+<van-tabs :active="active" swipeable>
+  <van-tab v-for="index in 4" :title="'tab ' + index">
+    content {{ index }}
+  </van-tab>
+</van-tabs>
+```
+
 ### Tabs API
 
 | Attribute | Description | Type | Default | Accepted Values |
@@ -132,6 +144,8 @@ Use title slot to custom tab title
 | active | Index of active tab | `String` `Number` | `0` | - |
 | duration | Toggle tab's animation time | `Number` | `0.2` | - | - |
 | swipe-threshold | Set swipe tabs threshold | `Number` | `4` | - | - |
+| sticky | Whether to use sticky mode | `Boolean` | `false` | - |
+| swipeable | Whether to switch tabs with swipe gestrue in the content | `Boolean` | `false` | - |
 
 ### Tab API
 
diff --git a/docs/markdown/zh-CN/tab.md b/docs/markdown/zh-CN/tab.md
index 3ac38def3..c234922cc 100644
--- a/docs/markdown/zh-CN/tab.md
+++ b/docs/markdown/zh-CN/tab.md
@@ -124,6 +124,18 @@ export default {
 </van-tabs>
 ```
 
+#### 滑动切换
+
+通过`swipeable`属性可以开启滑动切换tab
+
+```html
+<van-tabs :active="active" swipeable>
+  <van-tab v-for="index in 4" :title="'选项 ' + index">
+    内容 {{ index }}
+  </van-tab>
+</van-tabs>
+```
+
 ### Tabs API
 
 | 参数 | 说明 | 类型 | 默认值 | 可选 |
@@ -133,6 +145,7 @@ export default {
 | duration | 切换 tab 的动画时间 | `Number` | `0.2` | - |
 | swipe-threshold | 滚动阀值，设置 Tab 超过多少个可滚动 | `Number` | `4` | - |
 | sticky | 是否使用粘性定位布局 | `Boolean` | `false` | - |
+| swipeable | 是否可以滑动内容切换 | `Boolean` | `false` | - |
 
 ### Tab API
 
diff --git a/packages/stepper/index.vue b/packages/stepper/index.vue
index 7b925c0e3..4ab313c3c 100644
--- a/packages/stepper/index.vue
+++ b/packages/stepper/index.vue
@@ -103,6 +103,7 @@ export default create({
     onInput(event) {
       const { value } = event.target;
       this.currentValue = value ? this.correctValue(+value) : value;
+      event.target.value = this.currentValue;
       this.emitInput();
     },
 
diff --git a/packages/tabs/index.vue b/packages/tabs/index.vue
index e55607139..f5bd1c9aa 100644
--- a/packages/tabs/index.vue
+++ b/packages/tabs/index.vue
@@ -26,7 +26,7 @@
         </div>
       </div>
     </div>
-    <div class="van-tabs__content">
+    <div class="van-tabs__content" ref="content">
       <slot />
     </div>
   </div>
@@ -63,7 +63,8 @@ export default create({
     swipeThreshold: {
       type: Number,
       default: 4
-    }
+    },
+    swipeable: Boolean
   },
 
   data() {
@@ -71,7 +72,11 @@ export default create({
       tabs: [],
       position: 'content-top',
       curActive: 0,
-      navBarStyle: {}
+      navBarStyle: {},
+      pos: {
+        x: 0,
+        y: 0
+      }
     };
   },
 
@@ -115,6 +120,9 @@ export default create({
       if (this.sticky) {
         this.scrollHandler(true);
       }
+      if (this.swipeable) {
+        this.swipeableHandler(true);
+      }
       this.scrollIntoView();
     });
   },
@@ -124,6 +132,10 @@ export default create({
     if (this.sticky) {
       this.scrollHandler(false);
     }
+    /* istanbul ignore next */
+    if (this.swipeable) {
+      this.swipeableHandler(false);
+    }
   },
 
   methods: {
@@ -136,6 +148,46 @@ export default create({
       }
     },
 
+    // whether to bind content swipe listener
+    swipeableHandler(init) {
+      const swipeableEl = this.$refs.content;
+
+      this.touchMoveHandler = scrollUtils.debounce(this.watchTouchMove.bind(this), 500);
+
+      (init ? on : off)(swipeableEl, 'touchstart', this.recordTouchStartPosition, true);
+      (init ? on : off)(swipeableEl, 'touchmove', this.touchMoveHandler, true);
+    },
+
+    // record swipe touch start position
+    recordTouchStartPosition(e) {
+      this.pos = {
+        x: e.touches[0].clientX,
+        y: e.touches[0].clientY
+      };
+    },
+
+    // watch swipe touch move
+    watchTouchMove(e) {
+      const { pos } = this;
+      const dx = e.touches[0].clientX - pos.x;
+      const dy = e.touches[0].clientY - pos.y;
+      const isForward = dx > 0;
+      const isHorizontal = Math.abs(dy) < Math.abs(dx);
+      const minSwipeDistance = 50;
+
+      /* istanbul ignore else */
+      if (isHorizontal && Math.abs(dx) >= minSwipeDistance) {
+        const active = +this.curActive;
+
+        /* istanbul ignore else */
+        if (isForward && active !== 0) {
+          this.curActive = active - 1;
+        } else if (!isForward && active !== this.tabs.length - 1) {
+          this.curActive = active + 1;
+        }
+      }
+    },
+
     // adjust tab position
     onScroll() {
       const scrollTop = scrollUtils.getScrollTop(this.scrollEl);
diff --git a/packages/vant-css/src/vant-icon-743c0e.ttf b/packages/vant-css/src/vant-icon-743c0e.ttf
new file mode 100644
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diff --git a/test/components/tabs.vue b/test/components/tabs.vue
index bb0773a75..71486b498 100644
--- a/test/components/tabs.vue
+++ b/test/components/tabs.vue
@@ -1,5 +1,12 @@
 <template>
-  <van-tabs :active="active" :duration="duration" @click="handleTabClick" @disabled="handleTabDisabledClick" :sticky="sticky">
+  <van-tabs
+    :active="active"
+    :duration="duration"
+    :sticky="sticky"
+    :swipeable="swipeable"
+    @click="handleTabClick"
+    @disabled="handleTabDisabledClick"
+  >
     <van-tab :title="firstTabTitle" :disabled="firstTabDisabled">内容一</van-tab>
     <van-tab title="选项二">内容二</van-tab>
     <van-tab title="选项三" disabled>内容三</van-tab>
@@ -17,7 +24,8 @@ export default {
     firstTabDisabled: {
       type: Boolean
     },
-    sticky: Boolean
+    sticky: Boolean,
+    swipeable: Boolean
   },
 
   data() {
diff --git a/test/specs/tabs.spec.js b/test/specs/tabs.spec.js
index 7dacb080f..8e7a3c2b2 100644
--- a/test/specs/tabs.spec.js
+++ b/test/specs/tabs.spec.js
@@ -2,6 +2,7 @@ import Tabs from 'packages/tabs';
 import { mount } from 'avoriaz';
 import TabsTestComponent from '../components/tabs';
 import MoreTabsTestComponent from '../components/more-tabs';
+import { triggerTouch } from '../utils';
 
 describe('Tabs', () => {
   let wrapper;
@@ -114,7 +115,7 @@ describe('Tabs', () => {
     });
   });
 
-  it('sticky', (done) => {
+  it('create a sticky tabs', (done) => {
     wrapper = mount(TabsTestComponent, {
       attachToDocument: true,
       propsData: {
@@ -129,4 +130,34 @@ describe('Tabs', () => {
       done();
     }, 30);
   });
+
+  it('create a swipeable tabs', (done) => {
+    wrapper = mount(TabsTestComponent, {
+      attachToDocument: true,
+      propsData: {
+        swipeable: true
+      }      
+    });
+
+    const tabsContainer = wrapper.find('.van-tabs')[0];
+    const tabContent = wrapper.find('.van-tabs__content')[0];
+
+    expect(tabsContainer.vNode.child.curActive).to.equal(0);
+
+    wrapper.vm.$nextTick(() => {
+      triggerTouch(tabContent, 'touchstart', 0, 0);
+      triggerTouch(tabContent, 'touchmove', -100, 0);
+  
+      setTimeout(() => {
+        expect(tabsContainer.vNode.child.curActive).to.equal(1);
+  
+        triggerTouch(tabContent, 'touchstart', 0, 0);
+        triggerTouch(tabContent, 'touchmove', 100, 0);
+        setTimeout(() => {
+          expect(tabsContainer.vNode.child.curActive).to.equal(0);
+          done();      
+        }, 500);
+      }, 500);
+    })
+  });
 });