From 10b9dbdb094b328e8efaee444a09b84a87e812b5 Mon Sep 17 00:00:00 2001
From: AkiraFukushima <h3.poteto@gmail.com>
Date: Fri, 11 May 2018 01:10:30 +0900
Subject: [PATCH] refs #282 Add lazyLoading in account profile timeline

---
 .../TimelineSpace/Contents/SideBar.vue        |  4 +-
 .../SideBar/AccountProfile/Timeline.vue       | 38 ++++++++++++++++++-
 .../store/TimelineSpace/Contents/Home.js      |  2 +-
 .../SideBar/AccountProfile/Timeline.js        | 31 ++++++++++++++-
 4 files changed, 70 insertions(+), 5 deletions(-)

diff --git a/src/renderer/components/TimelineSpace/Contents/SideBar.vue b/src/renderer/components/TimelineSpace/Contents/SideBar.vue
index 7492163e..b1d62a15 100644
--- a/src/renderer/components/TimelineSpace/Contents/SideBar.vue
+++ b/src/renderer/components/TimelineSpace/Contents/SideBar.vue
@@ -5,7 +5,7 @@
       <i class="el-icon-loading" v-show="loading"></i>
       <i class="el-icon-close" @click="close"></i>
     </div>
-    <div class="scrollable">
+    <div id="sidebar_scrollable">
       <account-profile v-if="component === 1" v-on:change-loading="changeLoading"></account-profile>
       <toot-detail v-if="component === 2"></toot-detail>
     </div>
@@ -72,7 +72,7 @@ export default {
     }
   }
 
-  .scrollable {
+  #sidebar_scrollable {
     overflow: auto;
     height: calc(100% - 30px);
   }
diff --git a/src/renderer/components/TimelineSpace/Contents/SideBar/AccountProfile/Timeline.vue b/src/renderer/components/TimelineSpace/Contents/SideBar/AccountProfile/Timeline.vue
index 96579879..bbbe7125 100644
--- a/src/renderer/components/TimelineSpace/Contents/SideBar/AccountProfile/Timeline.vue
+++ b/src/renderer/components/TimelineSpace/Contents/SideBar/AccountProfile/Timeline.vue
@@ -3,6 +3,8 @@
   <template v-for="message in timeline">
     <toot :message="message" :key="message.id" v-on:update="updateToot" v-on:delete="deleteToot"></toot>
   </template>
+  <div class="loading-card" v-loading="lazyLoading" :element-loading-background="backgroundColor">
+  </div>
 </div>
 </template>
 
@@ -16,12 +18,22 @@ export default {
   components: { Toot },
   computed: {
     ...mapState({
-      timeline: state => state.TimelineSpace.Contents.SideBar.AccountProfile.Timeline.timeline
+      timeline: state => state.TimelineSpace.Contents.SideBar.AccountProfile.Timeline.timeline,
+      lazyLoading: state => state.TimelineSpace.Contents.SideBar.AccountProfile.Timeline.lazyLoading,
+      backgroundColor: state => state.App.theme.background_color
     })
   },
   created () {
     this.load()
   },
+  mounted () {
+    document.getElementById('sidebar_scrollable').addEventListener('scroll', this.onScroll)
+  },
+  destroyed () {
+    if (document.getElementById('sidebar_scrollable') !== undefined && document.getElementById('sidebar_scrollable') !== null) {
+      document.getElementById('sidebar_scrollable').removeEventListener('scroll', this.onScroll)
+    }
+  },
   watch: {
     account: function (newAccount, oldAccount) {
       this.load()
@@ -37,6 +49,23 @@ export default {
           })
         })
     },
+    onScroll (event) {
+      // for lazyLoading
+      if (((event.target.clientHeight + event.target.scrollTop) >= document.getElementById('account_profile').clientHeight - 10) && !this.lazyloading) {
+        this.$store.dispatch(
+          'TimelineSpace/Contents/SideBar/AccountProfile/Timeline/lazyFetchTimeline',
+          {
+            account: this.account,
+            last: this.timeline[this.timeline.length - 1]
+          })
+          .catch(() => {
+            this.$message({
+              message: 'Could not fetch account timeline',
+              type: 'error'
+            })
+          })
+      }
+    },
     updateToot (message) {
       this.$store.commit('TimelineSpace/Contents/SideBar/AccountProfile/Timeline/updateToot', message)
     },
@@ -48,4 +77,11 @@ export default {
 </script>
 
 <style lang="scss" scoped>
+  .loading-card {
+    height: 60px;
+  }
+
+  .loading-card:empty {
+    height: 0;
+  }
 </style>
diff --git a/src/renderer/store/TimelineSpace/Contents/Home.js b/src/renderer/store/TimelineSpace/Contents/Home.js
index a36f04b3..edf281ec 100644
--- a/src/renderer/store/TimelineSpace/Contents/Home.js
+++ b/src/renderer/store/TimelineSpace/Contents/Home.js
@@ -97,9 +97,9 @@ const Home = {
             api_url: rootState.TimelineSpace.account.baseURL + '/api/v1'
           })
         client.get('/timelines/home', { max_id: last.id, limit: 40 }, (err, data, res) => {
+          commit('changeLazyLoading', false)
           if (err) return reject(err)
           commit('insertTimeline', data)
-          commit('changeLazyLoading', false)
         })
       })
     }
diff --git a/src/renderer/store/TimelineSpace/Contents/SideBar/AccountProfile/Timeline.js b/src/renderer/store/TimelineSpace/Contents/SideBar/AccountProfile/Timeline.js
index 4b2bc95a..6a9c2576 100644
--- a/src/renderer/store/TimelineSpace/Contents/SideBar/AccountProfile/Timeline.js
+++ b/src/renderer/store/TimelineSpace/Contents/SideBar/AccountProfile/Timeline.js
@@ -3,12 +3,19 @@ import Mastodon from 'mastodon-api'
 const Timeline = {
   namespaced: true,
   state: {
-    timeline: []
+    timeline: [],
+    lazyLoading: false
   },
   mutations: {
     updateTimeline (state, timeline) {
       state.timeline = timeline
     },
+    insertTimeline (state, messages) {
+      state.timeline = state.timeline.concat(messages)
+    },
+    changeLazyLoading (state, value) {
+      state.lazyLoading = value
+    },
     updateToot (state, message) {
       // Replace target message in timeline
       state.timeline = state.timeline.map((toot) => {
@@ -52,6 +59,28 @@ const Timeline = {
           resolve(res)
         })
       })
+    },
+    lazyFetchTimeline ({ state, commit, rootState }, info) {
+      const last = info.last
+      if (last === undefined || last === null) {
+        return null
+      }
+      return new Promise((resolve, reject) => {
+        if (state.lazyLoading) {
+          return resolve()
+        }
+        commit('changeLazyLoading', true)
+        const client = new Mastodon(
+          {
+            access_token: rootState.TimelineSpace.account.accessToken,
+            api_url: rootState.TimelineSpace.account.baseURL + '/api/v1'
+          })
+        client.get(`/accounts/${info.account.id}/statuses`, { max_id: last.id, limit: 40 }, (err, data, res) => {
+          commit('changeLazyLoading', false)
+          if (err) return reject(err)
+          commit('insertTimeline', data)
+        })
+      })
     }
   }
 }