feature: add drag dialog (#477)

src/views/components-demo/dragDialog.vue

@@ -0,0 +1,43 @@
+<template>
+  <div class="components-container">
+    <el-button type="primary" @click="dialogTableVisible = true">open a Drag Dialog</el-button>
+    <el-dialog v-el-drag-dialog title="Shipping address" :visible.sync="dialogTableVisible">
+      <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-dialog>
+  </div>
+</template>
+
+<script>
+import elDragDialog from '@/directive/el-dragDialog' // base on element-ui
+
+export default {
+  name: 'dragDialog-demo',
+  directives: { elDragDialog },
+  data() {
+    return {
+      dialogTableVisible: false,
+      gridData: [{
+        date: '2016-05-02',
+        name: 'John Smith',
+        address: 'No.1518,  Jinshajiang Road, Putuo District'
+      }, {
+        date: '2016-05-04',
+        name: 'John Smith',
+        address: 'No.1518,  Jinshajiang Road, Putuo District'
+      }, {
+        date: '2016-05-01',
+        name: 'John Smith',
+        address: 'No.1518,  Jinshajiang Road, Putuo District'
+      }, {
+        date: '2016-05-03',
+        name: 'John Smith',
+        address: 'No.1518,  Jinshajiang Road, Putuo District'
+      }]
+    }
+  }
+}
+</script>