From df23405bdee225c37efde3bcb634db8b368919d6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=8A=B1=E8=A3=A4=E8=A1=A9?= <panfree23@gmail.com>
Date: Wed, 17 Oct 2018 17:39:25 +0800
Subject: [PATCH] feature: add pagination component (#1213)

---
 src/components/Pagination/index.vue | 99 +++++++++++++++++++++++++++++
 src/utils/index.js                  | 11 ----
 src/utils/scrollTo.js               | 50 +++++++++++++++
 src/views/example/list.vue          | 14 +---
 src/views/table/complexTable.vue    | 22 ++-----
 5 files changed, 158 insertions(+), 38 deletions(-)
 create mode 100644 src/components/Pagination/index.vue
 create mode 100644 src/utils/scrollTo.js

diff --git a/src/components/Pagination/index.vue b/src/components/Pagination/index.vue
new file mode 100644
index 00000000..9698232b
--- /dev/null
+++ b/src/components/Pagination/index.vue
@@ -0,0 +1,99 @@
+<template>
+  <div :class="{'hidden':hidden}" class="pagination-container">
+    <el-pagination
+      :background="background"
+      :current-page.sync="currentPage"
+      :page-size.sync="pageSize"
+      :layout="layout"
+      :total="total"
+      v-bind="$attrs"
+      @size-change="handleSizeChange"
+      @current-change="handleCurrentChange"/>
+  </div>
+</template>
+
+<script>
+import { scrollTo } from '@/utils/scrollTo'
+
+export default {
+  name: 'Pagination',
+  props: {
+    total: {
+      required: true,
+      type: Number
+    },
+    page: {
+      type: Number,
+      default: 1
+    },
+    limit: {
+      type: Number,
+      default: 20
+    },
+    pageSizes: {
+      type: Array,
+      default() {
+        return [10, 20, 30, 50]
+      }
+    },
+    layout: {
+      type: String,
+      default: 'total, sizes, prev, pager, next, jumper'
+    },
+    background: {
+      type: Boolean,
+      default: true
+    },
+    autoScroll: {
+      type: Boolean,
+      default: true
+    },
+    hidden: {
+      type: Boolean,
+      default: false
+    }
+  },
+  computed: {
+    currentPage: {
+      get() {
+        return this.page
+      },
+      set(val) {
+        this.$emit('update:page', val)
+      }
+    },
+    pageSize: {
+      get() {
+        return this.limit
+      },
+      set(val) {
+        this.$emit('update:limit', val)
+      }
+    }
+  },
+  methods: {
+    handleSizeChange(val) {
+      this.$emit('pagination', { page: this.currentPage, limit: val })
+      if (this.autoScroll) {
+        scrollTo(0, 800)
+      }
+    },
+    handleCurrentChange(val) {
+      this.$emit('pagination', { page: val, limit: this.pageSize })
+      if (this.autoScroll) {
+        scrollTo(0, 800)
+      }
+    }
+  }
+}
+</script>
+
+<style scoped>
+.pagination-container {
+  background: #fff;
+  padding: 32px 16px;
+}
+.pagination-container.hidden {
+  display: none;
+}
+</style>
diff --git a/src/utils/index.js b/src/utils/index.js
index 3af8b29b..0445827b 100644
--- a/src/utils/index.js
+++ b/src/utils/index.js
@@ -164,17 +164,6 @@ export function objectMerge(target, source) {
   return target
 }
 
-export function scrollTo(element, to, duration) {
-  if (duration <= 0) return
-  const difference = to - element.scrollTop
-  const perTick = (difference / duration) * 10
-  setTimeout(() => {
-    element.scrollTop = element.scrollTop + perTick
-    if (element.scrollTop === to) return
-    scrollTo(element, to, duration - 10)
-  }, 10)
-}
-
 export function toggleClass(element, className) {
   if (!element || !className) {
     return
diff --git a/src/utils/scrollTo.js b/src/utils/scrollTo.js
new file mode 100644
index 00000000..8affede6
--- /dev/null
+++ b/src/utils/scrollTo.js
@@ -0,0 +1,50 @@
+Math.easeInOutQuad = function(t, b, c, d) {
+  t /= d / 2
+  if (t < 1) {
+    return c / 2 * t * t + b
+  }
+  t--
+  return -c / 2 * (t * (t - 2) - 1) + b
+}
+
+// requestAnimationFrame for Smart Animating http://goo.gl/sx5sts
+var requestAnimFrame = (function() {
+  return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function(callback) { window.setTimeout(callback, 1000 / 60) }
+})()
+
+// because it's so fucking difficult to detect the scrolling element, just move them all
+function move(amount) {
+  document.documentElement.scrollTop = amount
+  document.body.parentNode.scrollTop = amount
+  document.body.scrollTop = amount
+}
+
+function position() {
+  return document.documentElement.scrollTop || document.body.parentNode.scrollTop || document.body.scrollTop
+}
+
+export function scrollTo(to, duration, callback) {
+  const start = position()
+  const change = to - start
+  const increment = 20
+  let currentTime = 0
+  duration = (typeof (duration) === 'undefined') ? 500 : duration
+  var animateScroll = function() {
+    // increment the time
+    currentTime += increment
+    // find the value with the quadratic in-out easing function
+    var val = Math.easeInOutQuad(currentTime, start, change, duration)
+    // move the document.body
+    move(val)
+    // do the animation unless its over
+    if (currentTime < duration) {
+      requestAnimFrame(animateScroll)
+    } else {
+      if (callback && typeof (callback) === 'function') {
+        // the animation is done so lets callback
+        callback()
+      }
+    }
+  }
+  animateScroll()
+}
diff --git a/src/views/example/list.vue b/src/views/example/list.vue
index 4ab61d38..85ae4e43 100644
--- a/src/views/example/list.vue
+++ b/src/views/example/list.vue
@@ -50,26 +50,18 @@
       </el-table-column>
     </el-table>
 
-    <div class="pagination-container">
-      <el-pagination
-        :current-page="listQuery.page"
-        :page-sizes="[10,20,30, 50]"
-        :page-size="listQuery.limit"
-        :total="total"
-        background
-        layout="total, sizes, prev, pager, next, jumper"
-        @size-change="handleSizeChange"
-        @current-change="handleCurrentChange"/>
-    </div>
+    <pagination v-show="total>0" :total="total" :page.sync="listQuery.page" :limit.sync="listQuery.limit" @pagination="getList" />
 
   </div>
 </template>
 
 <script>
 import { fetchList } from '@/api/article'
+import Pagination from '@/components/Pagination' // Secondary package based on el-pagination
 
 export default {
   name: 'ArticleList',
+  components: { Pagination },
   filters: {
     statusFilter(status) {
       const statusMap = {
diff --git a/src/views/table/complexTable.vue b/src/views/table/complexTable.vue
index b7fc076c..cf7b5e4e 100644
--- a/src/views/table/complexTable.vue
+++ b/src/views/table/complexTable.vue
@@ -80,9 +80,7 @@
       </el-table-column>
     </el-table>
 
-    <div class="pagination-container">
-      <el-pagination v-show="total>0" :current-page="listQuery.page" :page-sizes="[10,20,30, 50]" :page-size="listQuery.limit" :total="total" background layout="total, sizes, prev, pager, next, jumper" @size-change="handleSizeChange" @current-change="handleCurrentChange"/>
-    </div>
+    <pagination v-show="total>0" :total="total" :page.sync="listQuery.page" :limit.sync="listQuery.limit" @pagination="getList" />
 
     <el-dialog :title="textMap[dialogStatus]" :visible.sync="dialogFormVisible">
       <el-form ref="dataForm" :rules="rules" :model="temp" label-position="left" label-width="70px" style="width: 400px; margin-left:50px;">
@@ -130,8 +128,9 @@
 
 <script>
 import { fetchList, fetchPv, createArticle, updateArticle } from '@/api/article'
-import waves from '@/directive/waves' // 水波纹指令
+import waves from '@/directive/waves' // Waves directive
 import { parseTime } from '@/utils'
+import Pagination from '@/components/Pagination' // Secondary package based on el-pagination
 
 const calendarTypeOptions = [
   { key: 'CN', display_name: 'China' },
@@ -148,9 +147,8 @@ const calendarTypeKeyValue = calendarTypeOptions.reduce((acc, cur) => {
 
 export default {
   name: 'ComplexTable',
-  directives: {
-    waves
-  },
+  components: { Pagination },
+  directives: { waves },
   filters: {
     statusFilter(status) {
       const statusMap = {
@@ -168,7 +166,7 @@ export default {
     return {
       tableKey: 0,
       list: null,
-      total: null,
+      total: 0,
       listLoading: true,
       listQuery: {
         page: 1,
@@ -228,14 +226,6 @@ export default {
       this.listQuery.page = 1
       this.getList()
     },
-    handleSizeChange(val) {
-      this.listQuery.limit = val
-      this.getList()
-    },
-    handleCurrentChange(val) {
-      this.listQuery.page = val
-      this.getList()
-    },
     handleModifyStatus(row, status) {
       this.$message({
         message: '操作成功',