From 540cc21839d663a4f8aa2ab428adc1b057ba0c10 Mon Sep 17 00:00:00 2001
From: Trent Larson <trent@trentlarson.com>
Date: Thu, 14 Dec 2023 21:54:15 -0700
Subject: [PATCH] add infinite scroll to the home page feed

---
 project.task.yaml      |  1 +
 src/views/HomeView.vue | 96 ++++++++++++++++++++++++++----------------
 2 files changed, 60 insertions(+), 37 deletions(-)

diff --git a/project.task.yaml b/project.task.yaml
index 18fec304..80997875 100644
--- a/project.task.yaml
+++ b/project.task.yaml
@@ -50,6 +50,7 @@ tasks:
   - Other features - donation vs give, show offers, show give & outstanding totals, show network view, restrict registration, connect to contacts
   blocks: ref:https://raw.githubusercontent.com/trentlarson/lives-of-gifts/master/project.yaml#kickstarter%20for%20time
 
+- remove 'rowid' references (that are sqlite-specific)
 - make identicons for contacts into more-memorable faces (and maybe change project identicons, too)
 - 01 make the prod build copy the sw_scripts
 - 01 send visibility signal as a VC and store it
diff --git a/src/views/HomeView.vue b/src/views/HomeView.vue
index 395f4ae2..b28c1235 100644
--- a/src/views/HomeView.vue
+++ b/src/views/HomeView.vue
@@ -103,42 +103,52 @@
       showGivenToUser="true"
     />
 
+    <!-- Results List -->
     <div class="bg-slate-100 rounded-md overflow-hidden px-4 py-3 mb-4">
       <h2 class="text-xl font-bold mb-4">Latest Activity</h2>
+      <InfiniteScroll @reached-bottom="loadMoreGives">
+        <ul class="border-t border-slate-300">
+          <li
+            class="border-b border-slate-300 py-2"
+            v-for="record in feedData"
+            :key="record.jwtId"
+          >
+            <div
+              class="border-b border-dashed border-slate-400 text-orange-400 pb-2 mb-2 font-bold uppercase text-sm"
+              v-if="record.jwtId == feedLastViewedClaimId"
+            >
+              You've seen all the following
+            </div>
+
+            <div class="flex">
+              <fa icon="gift" class="pt-1 pr-2 text-slate-500"></fa>
+              <span class="">{{ this.giveDescription(record) }}</span>
+              <a @click="onClickLoadClaim(record.jwtId)">
+                <fa icon="circle-info" class="pl-2 pt-1 text-slate-500"></fa>
+              </a>
+            </div>
+          </li>
+        </ul>
+      </InfiniteScroll>
       <div :class="{ hidden: isHiddenSpinner }">
         <p class="text-slate-500 text-center italic mt-4 mb-4">
           <fa icon="spinner" class="fa-spin-pulse"></fa> Loading&hellip;
         </p>
       </div>
-      <ul class="border-t border-slate-300">
-        <li
-          class="border-b border-slate-300 py-2"
-          v-for="record in feedData"
-          :key="record.jwtId"
-        >
-          <div
-            class="border-b border-dashed border-slate-400 text-orange-400 pb-2 mb-2 font-bold uppercase text-sm"
-            v-if="record.jwtId == feedLastViewedId"
-          >
-            You've seen all the following
-          </div>
-          <div class="flex">
-            <fa icon="gift" class="pt-1 pr-2 text-slate-500"></fa>
-            <span class="">{{ this.giveDescription(record) }}</span>
-            <a @click="onClickLoadClaim(record.jwtId)">
-              <fa icon="circle-info" class="pl-2 pt-1 text-slate-500"></fa>
-            </a>
-          </div>
-        </li>
-      </ul>
     </div>
   </section>
 </template>
 
 <script lang="ts">
 import { Component, Vue } from "vue-facing-decorator";
+
+import EntityIcon from "@/components/EntityIcon.vue";
 import GiftedDialog from "@/components/GiftedDialog.vue";
+import InfiniteScroll from "@/components/InfiniteScroll.vue";
+import QuickNav from "@/components/QuickNav.vue";
 import { db, accountsDB } from "@/db/index";
+import { Account } from "@/db/tables/accounts";
+import { Contact } from "@/db/tables/contacts";
 import { MASTER_SETTINGS_KEY, Settings } from "@/db/tables/settings";
 import { accessToken } from "@/libs/crypto";
 import {
@@ -146,11 +156,7 @@ import {
   GiverInputInfo,
   GiveServerRecord,
 } from "@/libs/endorserServer";
-import { Contact } from "@/db/tables/contacts";
-import QuickNav from "@/components/QuickNav.vue";
-import EntityIcon from "@/components/EntityIcon.vue";
 import { IIdentifier } from "@veramo/core";
-import { Account } from "@/db/tables/accounts";
 
 interface Notification {
   group: string;
@@ -160,7 +166,7 @@ interface Notification {
 }
 
 @Component({
-  components: { GiftedDialog, QuickNav, EntityIcon },
+  components: { GiftedDialog, QuickNav, EntityIcon, InfiniteScroll },
 })
 export default class HomeView extends Vue {
   $notify!: (notification: Notification, timeout?: number) => void;
@@ -169,10 +175,9 @@ export default class HomeView extends Vue {
   allContacts: Array<Contact> = [];
   allMyDids: Array<string> = [];
   apiServer = "";
-  feedAllLoaded = false;
   feedData = [];
   feedPreviousOldestId?: string;
-  feedLastViewedId?: string;
+  feedLastViewedClaimId?: string;
   isHiddenSpinner = true;
   isRegistered = false;
   numAccounts = 0;
@@ -212,9 +217,12 @@ export default class HomeView extends Vue {
       this.apiServer = settings?.apiServer || "";
       this.activeDid = settings?.activeDid || "";
       this.allContacts = await db.contacts.toArray();
-      this.feedLastViewedId = settings?.lastViewedClaimId;
+      this.feedLastViewedClaimId = settings?.lastViewedClaimId;
       this.isRegistered = !!settings?.isRegistered;
+
+      // this returns a Promise but we don't need to wait for it
       this.updateAllFeed();
+
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
     } catch (err: any) {
       this.$notify(
@@ -257,24 +265,33 @@ export default class HomeView extends Vue {
     return headers;
   }
 
+  /**
+   * Data loader used by infinite scroller
+   * @param payload is the flag from the InfiniteScroll indicating if it should load
+   **/
+  public async loadMoreGives(payload: boolean) {
+    if (payload) {
+      this.updateAllFeed();
+    }
+  }
+
   public async updateAllFeed() {
     this.isHiddenSpinner = false;
-    await this.retrieveClaims(this.apiServer, this.feedPreviousOldestId)
+    await this.retrieveGives(this.apiServer, this.feedPreviousOldestId)
       .then(async (results) => {
         if (results.data.length > 0) {
           this.feedData = this.feedData.concat(results.data);
-          this.feedAllLoaded = results.hitLimit;
           this.feedPreviousOldestId =
             results.data[results.data.length - 1].jwtId;
+          // The following update is only done on the first load.
           if (
-            this.feedLastViewedId == null ||
-            this.feedLastViewedId < results.data[0].jwtId
+            this.feedLastViewedClaimId == null ||
+            this.feedLastViewedClaimId < results.data[0].jwtId
           ) {
             await db.open();
             db.settings.update(MASTER_SETTINGS_KEY, {
               lastViewedClaimId: results.data[0].jwtId,
             });
-            // but not for this page because we need to remember what it was before
           }
         }
       })
@@ -284,17 +301,22 @@ export default class HomeView extends Vue {
           {
             group: "alert",
             type: "danger",
-            title: "Export Error",
+            title: "Feed Error",
             text: e.userMessage || "There was an error retrieving feed data.",
           },
           -1,
         );
       });
-
     this.isHiddenSpinner = true;
   }
 
-  public async retrieveClaims(endorserApiServer: string, beforeId?: string) {
+  /**
+   * Retrieve claims in reverse chronological order
+   *
+   * @param beforeId the earliest ID (of previous searches) to search earlier
+   * @return claims in reverse chronological order
+   */
+  public async retrieveGives(endorserApiServer: string, beforeId?: string) {
     const beforeQuery = beforeId == null ? "" : "&beforeId=" + beforeId;
     const response = await fetch(
       endorserApiServer + "/api/v2/report/gives?" + beforeQuery,