Drawer: Add drawer component

components.json

@@ -78,5 +78,6 @@
   "infinite-scroll": "./packages/infinite-scroll/index.js",
   "page-header": "./packages/page-header/index.js",
   "cascader-panel": "./packages/cascader-panel/index.js",
-  "avatar": "./packages/avatar/index.js"
+  "avatar": "./packages/avatar/index.js",
+  "drawer": "./packages/drawer/index.js"
 }

examples/demo-styles/drawer.scss

@@ -0,0 +1,21 @@
+.demo-drawer {
+  &__content {
+    display: flex;
+    flex-direction: column;
+    height: 100%;
+    form {
+      flex: 1;
+    }
+  }
+
+  &__footer {
+    display: flex;
+    button {
+      flex: 1;
+    }
+  }
+}
+
+.el-drawer__body {
+  padding: 20px;
+}

examples/demo-styles/index.scss

@@ -43,4 +43,5 @@
 @import "./image.scss";
 @import "./infiniteScroll.scss";
 @import "./avatar.scss";
+@import "./drawer.scss";
 

examples/docs/en-US/drawer.md

@@ -0,0 +1,262 @@
+## Drawer
+
+Sometimes, `Dialog` does not always satisfy our requirements, let's say you have a massive form, or you need space to display something like `terms & conditions`, `Drawer` has almost identical API with `Dialog`, but it introduces different user experience.
+
+### Basic Usage
+
+Callout a temporary drawer, from multiple direction
+
+:::demo You must set `visible` for `Drawer` like `Dialog` does to control the visibility of `Drawer` itself, it's `boolean` type. `Drawer` has to parts: `title` & `body`, the `title` is a named slot, you can also set the title through attribute named `title`, default to an empty string, the `body` part is the main area of `Drawer`, which contains user defined content. When opening, `Drawer` expand itself from the **right corner to left** which size is **30%** of the browser window by default. You can change that default behavior by setting `direction` and `size` attribute. This show case also demonstrated how to use the `before-close` API, check the Attribute section for more detail
+
+```html
+<el-radio-group v-model="direction">
+  <el-radio label="ltr">left to right</el-radio>
+  <el-radio label="rtl">right to left</el-radio>
+  <el-radio label="ttb">top to bottom</el-radio>
+  <el-radio label="btt">bottom to top</el-radio>
+</el-radio-group>
+
+<el-button @click="drawer = true" type="primary" style="margin-left: 16px;">
+  open
+</el-button>
+
+<el-drawer
+  title="I am the title"
+  :visible.sync="drawer"
+  :direction="direction"
+  :before-close="handleClose">
+  <span>Hi, there!</span>
+</el-drawer>
+
+<script>
+  export default {
+    data() {
+      return {
+        drawer: false,
+        direction: 'rtl',
+      };
+    },
+    methods: {
+      handleClose(done) {
+        this.$confirm('Are you sure you want to close this?')
+          .then(_ => {
+            done();
+          })
+          .catch(_ => {});
+      }
+    }
+  };
+</script>
+```
+:::
+
+### Customization Content
+
+Like `Dialog`, `Drawer` can do many diverse interaction as you wanted.
+
+:::demo
+
+```html
+<el-button type="text" @click="table = true">Open Drawer with nested table</el-button>
+<el-button type="text" @click="dialog = true">Open Drawer with nested form</el-button>
+<el-drawer
+  title="I have a nested table inside!"
+  :visible.sync="table"
+  direction="rtl"
+  size="50%">
+   <el-table :data="gridData">
+      <el-table-column property="date" label="Date" width="150"></el-table-column>
+      <el-table-column property="name" label="Name" width="200"></el-table-column>
+      <el-table-column property="address" label="Address"></el-table-column>
+    </el-table>
+</el-drawer>
+
+<el-drawer
+  title="I have a nested form inside!"
+  :before-close="handleClose"
+  :visible.sync="dialog"
+  direction="ltr"
+  custom-class="demo-drawer"
+  ref="drawer"
+  >
+  <div class="demo-drawer__content">
+    <el-form :model="form">
+      <el-form-item label="Name" :label-width="formLabelWidth">
+        <el-input v-model="form.name" autocomplete="off"></el-input>
+      </el-form-item>
+      <el-form-item label="Area" :label-width="formLabelWidth">
+        <el-select v-model="form.region" placeholder="Please select activity area">
+          <el-option label="Area1" value="shanghai"></el-option>
+          <el-option label="Area2" value="beijing"></el-option>
+        </el-select>
+      </el-form-item>
+    </el-form>
+    <div class="demo-drawer__footer">
+      <el-button @click="dialog = false">Cancel</el-button>
+      <el-button type="primary" @click="$refs.drawer.closeDrawer()" :loading="loading">{{ loading ? 'Submitting ...' : 'Submit' }}</el-button>
+    </div>
+  </div>
+</el-drawer>
+
+<script>
+export default {
+  data() {
+    return {
+      table: false,
+      dialog: false,
+      loading: false,
+      gridData: [{
+        date: '2016-05-02',
+        name: 'Peter Parker',
+        address: 'Queens, New York City'
+      }, {
+        date: '2016-05-04',
+        name: 'Peter Parker',
+        address: 'Queens, New York City'
+      }, {
+        date: '2016-05-01',
+        name: 'Peter Parker',
+        address: 'Queens, New York City'
+      }, {
+        date: '2016-05-03',
+        name: 'Peter Parker',
+        address: 'Queens, New York City'
+      }],
+      form: {
+        name: '',
+        region: '',
+        date1: '',
+        date2: '',
+        delivery: false,
+        type: [],
+        resource: '',
+        desc: ''
+      },
+      formLabelWidth: '80px'
+    };
+  },
+  methods: {
+    handleClose(done) {
+      this.$confirm('Do you want to submit?')
+        .then(_ => {
+          this.loading = true;
+          setTimeout(() => {
+            this.loading = false;
+            done();
+          }, 2000);
+        })
+        .catch(_ => {});
+    }
+  }
+}
+</script>
+```
+:::
+
+### Nested Drawer
+
+You can also have multiple layer of `Drawer` just like `Dialog`.
+:::demo If you need multiple Drawer in different layer, you must set the `append-to-body` attribute to **true**
+
+```html
+
+<el-button @click="drawer = true" type="primary" style="margin-left: 16px;">
+  open
+</el-button>
+
+<el-drawer
+  title="I'm outer Drawer"
+  :visible.sync="drawer"
+  size="50%">
+  <div>
+   <el-button @click="innerDrawer = true">Click me!</el-button>
+   <el-drawer
+     title="I'm inner Drawer"
+     :append-to-body="true"
+     :before-close="handleClose"
+     :visible.sync="innerDrawer">
+     <p>_(:зゝ∠)_</p>
+   </el-drawer>
+  </div>
+</el-drawer>
+
+<script>
+  export default {
+    data() {
+      return {
+        drawer: false,
+        innerDrawer: false,
+      };
+    },
+    methods: {
+      handleClose(done) {
+        this.$confirm('You still have unsaved data, proceed?')
+          .then(_ => {
+            done();
+          })
+          .catch(_ => {});
+      }
+    }
+  };
+</script>
+
+```
+:::
+
+:::tip
+
+The content inside Drawer should be lazy rendered, which means that the content inside Drawer will not impact the initial render performance, therefore any DOM operation should be performed through `ref` or after `open` event emitted.
+
+:::
+
+:::tip
+
+Drawer provides an API called `destroyOnClose`, which is a flag variable that indicates should destroy the children content inside Drawer after Drawer was closed. You can use this API when you need your `mounted` life cycle to be called every time the Drawer opens.
+
+:::
+
+:::tip
+
+If the variable bound to `visible` is managed in Vuex store, the `.sync` can not work properly. In this case, please remove the `.sync` modifier, listen to `open` and `close` events of Dialog, and commit Vuex mutations to update the value of that variable in the event handlers.
+
+:::
+
+### Drawer Attributes
+
+| Parameter| Description | Type      | Acceptable Values                           | Defaults  |
+|---------- |-------------- |---------- |--------------------------------  |-------- |
+| append-to-body | Controls should Drawer be inserted to DocumentBody Element, nested Drawer must assign this param to **true**| boolean   | — | false |
+| before-close | If set, closing procedure will be halted | function(done), done is function type that accepts a boolean as parameter, calling done with true or without parameter will abort the close procedure | — | — |
+| close-on-press-escape | Indicates whether Drawer can be closed by pressing ESC | boolean | — | true |
+| custom-class | Extra class names for Drawer | string | — | — |
+| destroy-on-close | Indicates whether children should be destroyed after Drawer closed | boolean | - | false |
+| modal | Should show shadowing layer | boolean | — | true |
+| modal-append-to-body | Indicates should shadowing layer be insert into DocumentBody element | boolean   | — | true |
+| direction | Drawer's opening direction | Direction | rtl / ltr / ttb / tbb | rtl |
+| show-close | Should show close button at the top right of Drawer | boolean | — | true |
+| size | Drawer's size, if Drawer is horizontal mode, it effects the width property, otherwise it effects the height property, when size is `number` type, it describes the size by unit of pixels; when size is `string` type, it should be used with `x%` notation, other wise it will be interpreted to pixel unit | number / string | - | '30%' |
+| title | Drawer's title, can also be set by named slot, detailed descriptions can be found in the slot form | string | — | — |
+| visible | Should Drawer be displayed, also support the `.sync` notation | boolean | — | false |
+| wrapperClosable | Indicates whether user can close Drawer by clicking the shadowing layer. | boolean | - | true |
+
+### Drawer Slot
+
+| Name | Description |
+|------|--------|
+| — | Drawer's Content |
+| title | Drawer Title Section |
+
+### Drawer Methods
+
+| Name | Description |
+| ---- | ---  |
+| closeDrawer | In order to close Drawer, this method will call `before-close`. |
+
+### Drawer Events
+
+| Event Name | Description | Parameter |
+|---------- |-------- |---------- |
+| open  | Triggered before Drawer opening animation begins  | — |
+| opened  | Triggered after Drawer opening animation ended | — |
+| close  | Triggered before Drawer closing animation begins | — |
+| closed | Triggered after Drawer closing animation ended | — |