From 559dde96163736eadc648af495e65a0b11b77ae4 Mon Sep 17 00:00:00 2001
From: rex <rexkaneki@gmail.com>
Date: Fri, 23 Nov 2018 23:29:32 +0800
Subject: [PATCH] feat(Collapse): add new component Collapse @rex-zsd (#936)

---
 docs/src/Preview.vue              |   3 +-
 example/app.json                  |   7 +-
 example/config.js                 |   4 +
 example/pages/collapse/index.js   |  21 +++++
 example/pages/collapse/index.json |   3 +
 example/pages/collapse/index.wxml |  37 +++++++++
 example/pages/collapse/index.wxss |  12 +++
 packages/cell/index.less          |   6 +-
 packages/cell/index.ts            |   5 +-
 packages/collapse-item/index.json |   6 ++
 packages/collapse-item/index.less |  38 +++++++++
 packages/collapse-item/index.ts   |  96 ++++++++++++++++++++++
 packages/collapse-item/index.wxml |  39 +++++++++
 packages/collapse/README.md       | 127 ++++++++++++++++++++++++++++++
 packages/collapse/index.json      |   3 +
 packages/collapse/index.ts        |  52 ++++++++++++
 packages/collapse/index.wxml      |   3 +
 17 files changed, 454 insertions(+), 8 deletions(-)
 create mode 100644 example/pages/collapse/index.js
 create mode 100644 example/pages/collapse/index.json
 create mode 100644 example/pages/collapse/index.wxml
 create mode 100644 example/pages/collapse/index.wxss
 create mode 100644 packages/collapse-item/index.json
 create mode 100644 packages/collapse-item/index.less
 create mode 100644 packages/collapse-item/index.ts
 create mode 100644 packages/collapse-item/index.wxml
 create mode 100644 packages/collapse/README.md
 create mode 100644 packages/collapse/index.json
 create mode 100644 packages/collapse/index.ts
 create mode 100644 packages/collapse/index.wxml

diff --git a/docs/src/Preview.vue b/docs/src/Preview.vue
index 5bbeb849..d35ad5e4 100644
--- a/docs/src/Preview.vue
+++ b/docs/src/Preview.vue
@@ -49,7 +49,8 @@ const MAP = {
   transition: 'transition-20180821.png',
   'tree-select': 'tree-select-201808092138.png',
   checkbox: 'checkbox-20181110.jpeg',
-  rate: 'rate-20181120-1.png'
+  rate: 'rate-20181120-1.png',
+  collapse: 'collapse-20181123.png'
 };
 
 export default {
diff --git a/example/app.json b/example/app.json
index a6d39e66..7eec9973 100644
--- a/example/app.json
+++ b/example/app.json
@@ -36,7 +36,8 @@
     "pages/goods-action/index",
     "pages/swipe-cell/index",
     "pages/datetime-picker/index",
-    "pages/rate/index"
+    "pages/rate/index",
+    "pages/collapse/index"
   ],
   "window": {
     "navigationBarBackgroundColor": "#f8f8f8",
@@ -91,6 +92,8 @@
     "van-transition": "../../dist/transition/index",
     "van-tree-select": "../../dist/tree-select/index",
     "van-datetime-picker": "../../dist/datetime-picker/index",
-    "van-rate": "../../dist/rate/index"
+    "van-rate": "../../dist/rate/index",
+    "van-collapse": "../../dist/collapse/index",
+    "van-collapse-item": "../../dist/collapse-item/index"
   }
 }
diff --git a/example/config.js b/example/config.js
index 5c7c562d..696d756e 100644
--- a/example/config.js
+++ b/example/config.js
@@ -109,6 +109,10 @@ export default [
         path: '/notice-bar',
         title: 'NoticeBar 通告栏'
       },
+      {
+        path: '/collapse',
+        title: 'Collapse 折叠面板'
+      },
       {
         path: '/panel',
         title: 'Panel 面板'
diff --git a/example/pages/collapse/index.js b/example/pages/collapse/index.js
new file mode 100644
index 00000000..39e097f4
--- /dev/null
+++ b/example/pages/collapse/index.js
@@ -0,0 +1,21 @@
+import Page from '../../common/page';
+
+Page({
+  data: {
+    active1: [0],
+    active2: 0,
+    active3: [],
+    title1: '有赞微商城',
+    title2: '有赞零售',
+    title3: '有赞美业',
+    content1: '提供多样店铺模板，快速搭建网上商城',
+    content2: '网店吸粉获客、会员分层营销、一机多种收款，告别经营低效和客户流失',
+    content3: '线上拓客，随时预约，贴心顺手的开单收银'
+  },
+  onChange(event) {
+    const { key } = event.currentTarget.dataset;
+    this.setData({
+      [key]: event.detail
+    });
+  }
+});
diff --git a/example/pages/collapse/index.json b/example/pages/collapse/index.json
new file mode 100644
index 00000000..e2178559
--- /dev/null
+++ b/example/pages/collapse/index.json
@@ -0,0 +1,3 @@
+{
+  "navigationBarTitleText": "Collapse 折叠面板"
+}
diff --git a/example/pages/collapse/index.wxml b/example/pages/collapse/index.wxml
new file mode 100644
index 00000000..2a28e4e5
--- /dev/null
+++ b/example/pages/collapse/index.wxml
@@ -0,0 +1,37 @@
+<demo-block title="基础用法">
+  <van-collapse value="{{ active1 }}" data-key="active1" bind:change="onChange">
+    <van-collapse-item title="{{ title1 }}" content-class="van-collapse-item__content">{{ content1 }}</van-collapse-item>
+    <van-collapse-item title="{{ title2 }}" content-class="van-collapse-item__content">{{ content2 }}</van-collapse-item>
+    <van-collapse-item
+      title="{{ title3 }}"
+      content-class="van-collapse-item__content"
+      disabled
+    >
+      {{ content3 }}
+    </van-collapse-item>
+  </van-collapse>
+</demo-block>
+
+<demo-block title="手风琴">
+  <van-collapse value="{{ active2 }}" data-key="active2" accordion bind:change="onChange">
+    <van-collapse-item title="{{ title1 }}" content-class="van-collapse-item__content">{{ content1 }}</van-collapse-item>
+    <van-collapse-item title="{{ title2 }}" content-class="van-collapse-item__content">{{ content2 }}</van-collapse-item>
+    <van-collapse-item title="{{ title3 }}" content-class="van-collapse-item__content">{{ content3 }}</van-collapse-item>
+  </van-collapse>
+</demo-block>
+
+<demo-block title="自定义标题内容">
+  <van-collapse value="{{ active3 }}" data-key="active3" bind:change="onChange">
+    <van-collapse-item content-class="van-collapse-item__content">
+      <view slot="title">{{ title1 }}<van-icon name="question" custom-class="van-icon-question" /></view>
+      {{ content1 }}
+    </van-collapse-item>
+    <van-collapse-item
+      title="{{ title2 }}"
+      content-class="van-collapse-item__content"
+      value="内容"
+      icon="shop"
+    >{{ content2 }}</van-collapse-item>
+    <van-collapse-item title="{{ title3 }}" content-class="van-collapse-item__content">{{ content3 }}</van-collapse-item>
+  </van-collapse>
+</demo-block>
diff --git a/example/pages/collapse/index.wxss b/example/pages/collapse/index.wxss
new file mode 100644
index 00000000..71c599a9
--- /dev/null
+++ b/example/pages/collapse/index.wxss
@@ -0,0 +1,12 @@
+.van-collapse-item__content {
+  font-size: 13px;
+  line-height: 1.5;
+  color: #666;
+}
+
+.van-icon-question {
+  margin-left: 5px;
+  font-size: 15px !important;
+  color: #1989fa;
+  vertical-align: -3px;
+}
diff --git a/packages/cell/index.less b/packages/cell/index.less
index 1a40b533..e615a431 100644
--- a/packages/cell/index.less
+++ b/packages/cell/index.less
@@ -54,10 +54,13 @@
 
   &__left-icon-wrap {
     margin-right: 5px;
+    font-size: 16px;
   }
 
   &__right-icon-wrap {
     margin-left: 5px;
+    font-size: 12px;
+    color: @gray-dark;
 
     &--left {
       transform: rotate(180deg);
@@ -73,14 +76,11 @@
   }
 
   &__left-icon {
-    font-size: 16px !important;
     line-height: 24px;
     vertical-align: middle;
   }
 
   &__right-icon {
-    color: @gray-dark;
-    font-size: 12px !important;
     line-height: 24px;
   }
 
diff --git a/packages/cell/index.ts b/packages/cell/index.ts
index c4f50aab..709a4412 100644
--- a/packages/cell/index.ts
+++ b/packages/cell/index.ts
@@ -5,7 +5,8 @@ VantComponent({
   classes: [
     'title-class',
     'label-class',
-    'value-class'
+    'value-class',
+    'right-icon-class'
   ],
 
   mixins: [link],
@@ -47,7 +48,7 @@ VantComponent({
     },
 
     iconWrapClass(): string {
-      const prefix = 'van-cell__right-icon-wrap';
+      const prefix = 'van-cell__right-icon-wrap right-icon-class';
       return this.classNames(prefix, `${prefix}--${this.data.arrowDirection}`);
     }
   },
diff --git a/packages/collapse-item/index.json b/packages/collapse-item/index.json
new file mode 100644
index 00000000..0e5425cd
--- /dev/null
+++ b/packages/collapse-item/index.json
@@ -0,0 +1,6 @@
+{
+  "component": true,
+  "usingComponents": {
+    "van-cell": "../cell/index"
+  }
+}
diff --git a/packages/collapse-item/index.less b/packages/collapse-item/index.less
new file mode 100644
index 00000000..e883feb2
--- /dev/null
+++ b/packages/collapse-item/index.less
@@ -0,0 +1,38 @@
+@import '../common/style/var.less';
+
+.van-collapse-item {
+  &__title {
+    .van-cell__right-icon {
+      transform: rotate(90deg);
+      transition: 0.3s;
+    }
+
+    &--expanded {
+      .van-cell__right-icon {
+        transform: rotate(-90deg);
+      }
+    }
+
+    &--disabled {
+      & .van-cell,
+      & .van-cell__right-icon {
+        color: @gray !important;
+      }
+
+      &:active {
+        background-color: @white !important;
+      }
+    }
+  }
+
+  &__wrapper {
+    overflow: hidden;
+    will-change: max-height;
+    transition: max-height 0.3s ease-in-out;
+  }
+
+  &__content {
+    padding: 15px;
+    background-color: @white;
+  }
+}
diff --git a/packages/collapse-item/index.ts b/packages/collapse-item/index.ts
new file mode 100644
index 00000000..63aa4c6a
--- /dev/null
+++ b/packages/collapse-item/index.ts
@@ -0,0 +1,96 @@
+import { VantComponent } from '../common/component';
+
+VantComponent({
+  classes: ['content-class'],
+
+  relation: {
+    name: 'collapse',
+    type: 'ancestor',
+    linked(parent: Weapp.Component) {
+      this.parent = parent;
+    }
+  },
+
+  props: {
+    name: [String, Number],
+    icon: String,
+    label: String,
+    title: [String, Number],
+    value: [String, Number],
+    disabled: Boolean,
+    border: {
+      type: Boolean,
+      value: true
+    },
+    isLink: {
+      type: Boolean,
+      value: true
+    }
+  },
+
+  data: {
+    contentHeight: 0,
+    expanded: false
+  },
+
+  computed: {
+    titleClass() {
+      const { disabled, expanded } = this.data;
+      return this.classNames('van-collapse-item__title', {
+        'van-collapse-item__title--disabled': disabled,
+        'van-collapse-item__title--expanded': expanded
+      });
+    }
+  },
+
+  methods: {
+    updateExpanded() {
+      if (!this.parent) {
+        return null;
+      }
+
+      const { value, accordion, items } = this.parent.data;
+      const { name } = this.data;
+
+      const index = items.indexOf(this);
+      const currentName = name == null ? index : name;
+
+      const expanded = accordion
+        ? value === currentName
+        : value.some(name => name === currentName);
+
+      if (expanded !== this.data.expanded) {
+        this.updateStyle(expanded);
+      }
+
+      this.setData({ expanded });
+    },
+
+    updateStyle(expanded) {
+      if (expanded) {
+        this.getRect('.van-collapse-item__content').then(res => {
+          this.setData({
+            contentHeight: res.height ? res.height + 'px' : null
+          });
+        });
+      } else {
+        this.setData({
+          contentHeight: 0
+        });
+      }
+    },
+
+    onClick() {
+      if (this.data.disabled) {
+        return;
+      }
+
+      const { name, expanded } = this.data;
+
+      const index = this.parent.data.items.indexOf(this);
+      const currentName = name == null ? index : name;
+
+      this.parent.switch(currentName, !expanded);
+    }
+  }
+});
diff --git a/packages/collapse-item/index.wxml b/packages/collapse-item/index.wxml
new file mode 100644
index 00000000..f1fc9d3c
--- /dev/null
+++ b/packages/collapse-item/index.wxml
@@ -0,0 +1,39 @@
+<view class="van-collapse-item van-hairline--top custom-class">
+  <van-cell
+    title="{{ title }}"
+    icon="{{ icon }}"
+    is-link="{{ isLink }}"
+    value="{{ value }}"
+    label="{{ label }}"
+    border="{{ border && expanded }}"
+    class="{{ titleClass }}"
+    right-icon-class="van-cell__right-icon"
+    custom-class="van-cell"
+    arrow-direction="{{ expanded ? 'up' : 'down' }}"
+    bind:click="onClick"
+  >
+    <slot
+      name="title"
+      slot="title"
+    />
+    <slot
+      name="icon"
+      slot="icon"
+    />
+    <slot name="value" />
+    <slot
+      name="right-icon"
+      slot="right-icon"
+    />
+  </van-cell>
+  <view
+    class="van-collapse-item__wrapper"
+    style="max-height: {{ contentHeight }};"
+  >
+    <view
+      class="van-collapse-item__content content-class"
+    >
+      <slot />
+    </view>
+  </view>
+</view>
diff --git a/packages/collapse/README.md b/packages/collapse/README.md
new file mode 100644
index 00000000..2ff3813e
--- /dev/null
+++ b/packages/collapse/README.md
@@ -0,0 +1,127 @@
+## Collapse 折叠面板
+
+### 使用指南
+在 app.json 或 index.json 中引入组件
+```json
+"usingComponents": {
+  "van-collapse": "path/to/vant-weapp/dist/collapse/index",
+  "van-collapse-item": "path/to/vant-weapp/dist/collapse-item/index"
+}
+```
+
+### 代码演示
+
+#### 基础用法
+通过`value`控制展开的面板列表，`activeNames`为数组格式
+
+```html
+<van-collapse value="{{ activeNames }}">
+  <van-collapse-item title="有赞微商城" name="1">
+    提供多样店铺模板，快速搭建网上商城
+  </van-collapse-item>
+  <van-collapse-item title="有赞零售" name="2">
+    网店吸粉获客、会员分层营销、一机多种收款，告别经营低效和客户流失
+  </van-collapse-item>
+  <van-collapse-item title="有赞美业" name="3" disabled>
+    线上拓客，随时预约，贴心顺手的开单收银
+  </van-collapse-item>
+</van-collapse>
+```
+
+``` javascript
+Page({
+  data: {
+    activeNames: ['1']
+  }
+});
+```
+
+#### 手风琴
+通过`accordion`可以设置为手风琴模式，最多展开一个面板，此时`activeName`为字符串格式
+
+```html
+<van-collapse value="{{ activeName }}" accordion>
+  <van-collapse-item title="有赞微商城" name="1">
+    提供多样店铺模板，快速搭建网上商城
+  </van-collapse-item>
+  <van-collapse-item title="有赞零售" name="2">
+    网店吸粉获客、会员分层营销、一机多种收款，告别经营低效和客户流失
+  </van-collapse-item>
+  <van-collapse-item title="有赞美业" name="3">
+    线上拓客，随时预约，贴心顺手的开单收银
+  </van-collapse-item>
+</van-collapse>
+```
+
+``` javascript
+Page({
+  data: {
+    activeName: '1'
+  }
+});
+```
+
+#### 自定义标题内容
+
+```html
+<van-collapse value="{{ activeNames }}">
+  <van-collapse-item name="1">
+    <view slot="title">有赞微商城<van-icon name="question" /></view>
+    提供多样店铺模板，快速搭建网上商城
+  </van-collapse-item>
+  <van-collapse-item title="有赞零售" name="2">
+    网店吸粉获客、会员分层营销、一机多种收款，告别经营低效和客户流失
+  </van-collapse-item>
+</van-collapse>
+```
+
+
+
+### Collapse API
+
+| 参数 | 说明 | 类型 | 默认值 | 版本 |
+|------|------|------|------|------|
+| value | 当前展开面板的 name | `Array | String | Number` | - |
+| accordion | 是否开启手风琴模式 | `Boolean` | `false` |
+
+### Collapse Event
+
+| 事件名 | 说明 | 参数 |
+|------|------|------|
+| change | 切换面板时触发 | activeNames: `String | Array` |
+
+### CollapseItem API
+
+| 参数 | 说明 | 类型 | 默认值 |
+|------|------|------|------|------|
+| name | 唯一标识符，默认为索引值 | `String | Number` | `index` |
+| title | 标题栏左侧内容 | `String | Number` | - |
+| icon | 标题栏左侧图标，可选值见 Icon 组件 | `String` | - |
+| value | 标题栏右侧内容 | `String | Number` | - |
+| label | 标题栏描述信息 | `String` | - |
+| border | 是否显示内边框 | `Boolean` | `true` |
+| is-link | 是否展示标题栏右侧箭头并开启点击反馈 | `Boolean` | `true` |
+| disabled | 是否禁用面板 | `Boolean` | `false` |
+
+### CollapseItem Slot
+
+| 名称 | 说明 |
+|------|------|
+| - | 面板内容 |
+| value | 自定义显示内容 |
+| icon | 自定义`icon` |
+| title | 自定义`title` |
+| right-icon | 自定义右侧按钮，默认是`arrow` |
+
+### Collapse 外部样式类
+
+| 类名 | 说明 |
+|-----------|-----------|
+| custom-class | 根节点样式类 |
+
+### CollapseItem 外部样式类
+
+| 类名 | 说明 |
+|-----------|-----------|
+| custom-class | 根节点样式类 |
+| content-class | 内容样式类 |
diff --git a/packages/collapse/index.json b/packages/collapse/index.json
new file mode 100644
index 00000000..467ce294
--- /dev/null
+++ b/packages/collapse/index.json
@@ -0,0 +1,3 @@
+{
+  "component": true
+}
diff --git a/packages/collapse/index.ts b/packages/collapse/index.ts
new file mode 100644
index 00000000..56da046c
--- /dev/null
+++ b/packages/collapse/index.ts
@@ -0,0 +1,52 @@
+import { VantComponent } from '../common/component';
+
+VantComponent({
+  relation: {
+    name: 'collapse-item',
+    type: 'descendant',
+    linked(child: Weapp.Component) {
+      this.setData({
+        items: [...this.data.items, child]
+      }, () => {
+        child.updateExpanded();
+      });
+    }
+  },
+
+  props: {
+    accordion: Boolean,
+    value: null
+  },
+
+  data: {
+    items: []
+  },
+
+  watch: {
+    value() {
+      this.data.items.forEach(child => {
+        child.updateExpanded();
+      });
+    },
+    accordion() {
+      this.data.items.forEach(child => {
+        child.updateExpanded();
+      });
+    }
+  },
+
+  methods: {
+    switch(name, expanded) {
+      const { accordion, value } = this.data;
+      if (!accordion) {
+        name = expanded
+          ? value.concat(name)
+          : value.filter(activeName => activeName !== name);
+      } else {
+        name = expanded ? name : '';
+      }
+      this.$emit('change', name);
+      this.$emit('input', name);
+    }
+  }
+});
diff --git a/packages/collapse/index.wxml b/packages/collapse/index.wxml
new file mode 100644
index 00000000..49667522
--- /dev/null
+++ b/packages/collapse/index.wxml
@@ -0,0 +1,3 @@
+<view class="van-collapse van-hairline--top-bottom custom-class">
+  <slot />
+</view>