From 6006d47c1f3397862bb13c782d66689067135bdb Mon Sep 17 00:00:00 2001
From: Emiliano Ciavatta
Date: Sat, 9 May 2020 14:34:08 +0200
Subject: Add infinite scroll to connections, implement connection actions

---
 frontend/src/views/Connections.js | 94 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 87 insertions(+), 7 deletions(-)

(limited to 'frontend/src/views/Connections.js')

diff --git a/frontend/src/views/Connections.js b/frontend/src/views/Connections.js
index fa7798e..400f4e0 100644
--- a/frontend/src/views/Connections.js
+++ b/frontend/src/views/Connections.js
@@ -4,29 +4,107 @@ import axios from 'axios'
 import Connection from "../components/Connection";
 import Table from 'react-bootstrap/Table';
 import {Redirect} from 'react-router';
+import {objectToQueryString} from "../utils";
 
 class Connections extends Component {
+
     constructor(props) {
         super(props);
         this.state = {
+            loading: false,
             connections: [],
+            firstConnection: null,
+            lastConnection: null,
+            showHidden: false
         };
-    }
 
+        this.scrollTopThreashold = 0.00001;
+        this.scrollBottomThreashold = 0.99999;
+        this.maxConnections = 500;
+        this.queryLimit = 50;
 
+        this.handleScroll = this.handleScroll.bind(this);
+    }
+    
     componentDidMount() {
-        axios.get("/api/connections").then(res => this.setState({connections: res.data}))
+        this.loadConnections({limit: this.queryLimit, hidden: this.state.showHidden});
+    }
+
+    handleScroll(e) {
+        let relativeScroll = e.currentTarget.scrollTop / (e.currentTarget.scrollHeight - e.currentTarget.clientHeight);
+        if (!this.state.loading && relativeScroll > this.scrollBottomThreashold) {
+            this.loadConnections({
+                from: this.state.lastConnection.id, limit: this.queryLimit,
+                hidden: this.state.showHidden
+            });
+        }
+        if (!this.state.loading && relativeScroll < this.scrollTopThreashold) {
+            this.loadConnections({
+                to: this.state.firstConnection.id, limit: this.queryLimit,
+                hidden: this.state.showHidden
+            });
+        }
+
+    }
+
+    async loadConnections(params) {
+        let url = "/api/connections";
+        if (params !== undefined) {
+            url += "?" + objectToQueryString(params);
+        }
+        this.setState({loading: true});
+        let res = await axios.get(url);
+
+        let connections = this.state.connections;
+        let firstConnection = this.state.firstConnection;
+        let lastConnection = this.state.lastConnection;
+        if (res.data.length > 0) {
+            if (params !== undefined && params.from !== undefined) {
+                connections = this.state.connections.concat(res.data);
+                lastConnection = connections[connections.length - 1];
+                if (connections.length > this.maxConnections) {
+                    connections = connections.slice(connections.length - this.maxConnections,
+                        connections.length - 1);
+                    firstConnection = connections[0];
+                }
+            } else if (params !== undefined && params.to !== undefined) {
+                connections = res.data.concat(this.state.connections);
+                firstConnection = connections[0];
+                if (connections.length > this.maxConnections) {
+                    connections = connections.slice(0, this.maxConnections);
+                    lastConnection = connections[this.maxConnections - 1];
+                }
+            } else {
+                connections = res.data;
+                firstConnection = connections[0];
+                lastConnection = connections[connections.length - 1];
+            }
+        }
+
+        this.setState({
+            loading: false,
+            connections: connections,
+            firstConnection: firstConnection,
+            lastConnection: lastConnection
+        });
     }
 
+
     render() {
-        let redirect = ""
+        let redirect = "";
         if (this.state.selected) {
-            redirect = <Redirect push to={"/connections/" + this.state.selected} />;
+            redirect = <Redirect push to={"/connections/" + this.state.selected}/>;
         }
 
-        return (
+        let loading = null;
+        if (this.state.loading) {
+            loading = <tr>
+                <td colSpan={9}>Loading...</td>
+            </tr>;
+        }
 
-            <div className="connections">
+        return (
+            <div className="connections" onScroll={this.handleScroll}>
                 <div className="connections-header-padding"/>
                 <Table borderless size="sm">
                     <thead>
@@ -46,9 +124,11 @@ class Connections extends Component {
                     {
                         this.state.connections.map(c =>
                             <Connection key={c.id} data={c} onSelected={() => this.setState({selected: c.id})}
-                                selected={this.state.selected === c.id}/>
+                                        selected={this.state.selected === c.id} onMarked={marked => c.marked = marked}
+                                        onEnabled={enabled => c.hidden = !enabled}/>
                         )
                     }
+                    {loading}
                     </tbody>
                 </Table>
 
-- 
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