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annotate src/render/StreamedGraph.ts @ 109:cbcd82d21356

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cleanup
author drewp@bigasterisk.com
date Fri, 18 Mar 2022 12:00:33 -0700
parents 5e6840229a05
children 3cdbbd913f1d
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1 import { html, LitElement, render, TemplateResult } from "lit";
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2 import { customElement, property } from "lit/decorators.js";
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3 import { Store } from "n3";
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4 import { StreamedGraphClient } from "../layout/StreamedGraphClient";
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5 import { ViewConfig } from "../layout/ViewConfig";
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6 import { GraphView } from "./GraphView";
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7 import { addFontToRootPage, style } from "./style";
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8
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9 export interface VersionedGraph {
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10 version: number;
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11 store: Store;
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12 }
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13
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14 @customElement("streamed-graph")
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15 export class StreamedGraph extends LitElement {
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16 @property({ type: String })
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17 url: string = "";
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18 @property({ type: String })
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19 view: string = "";
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20 @property({ type: Object })
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21 graph!: VersionedGraph;
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22
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23 @property({ type: Boolean })
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24 expanded: boolean = false;
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25
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26 @property({ type: String })
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27 status: string = "";
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28
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29 sg!: StreamedGraphClient;
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30 graphViewDirty = true;
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31
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32 static styles = style;
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33
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34 render() {
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35 const expandAction = this.expanded ? "-" : "+";
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36 return html`
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37 <div id="ui">
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38 <span class="expander"
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39 ><button @click="${this.toggleExpand}">${expandAction}</button></span
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40 >
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41 StreamedGraph <a href="${this.url}">[source]</a>: ${this.status}
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42 </div>
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43 <div id="graphView"></div>
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44 `;
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45 }
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46
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47 connectedCallback() {
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48 super.connectedCallback();
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49 addFontToRootPage();
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50 const emptyStore = new Store();
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51 this.graph = { version: -1, store: emptyStore };
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52
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53 this._onUrl(this.url); // todo: watch for changes and rebuild
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54 if (this.expanded) {
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55 this.redrawGraph();
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56 }
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57 }
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58
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59 toggleExpand() {
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60 this.expanded = !this.expanded;
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61 if (this.expanded) {
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62 this.redrawGraph();
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63 } else {
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64 this.graphViewDirty = false;
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65 this._graphAreaClose();
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66 }
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67 }
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68
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69 redrawGraph() {
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70 this.graphViewDirty = true;
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71 const rl: () => Promise<void> = this._redrawLater.bind(this);
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72 requestAnimationFrame(rl);
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73 }
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74
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75 _onUrl(url: string) {
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76 if (this.sg) {
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77 this.sg.close();
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78 }
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79 this.sg = new StreamedGraphClient(
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80 url,
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81 this.onGraphChanged.bind(this),
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82 (st) => {
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83 this.status = st;
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84 },
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85 [], //window.NS,
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86 []
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87 );
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88 }
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89
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90 onGraphChanged() {
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91 this.graph = {
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92 version: this.graph.version + 1,
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93 store: this.sg.store,
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94 };
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95 if (this.expanded) {
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96 this.redrawGraph();
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97 }
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98 this.dispatchEvent(
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99 new CustomEvent("graph-changed", { detail: { graph: this.graph } })
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100 );
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101 }
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102
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103 async _redrawLater() {
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104 if (!this.graphViewDirty) return;
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105
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106 if ((this.graph as VersionedGraph).store && this.graph.store) {
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107 const vc = new ViewConfig();
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108
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109 await this._graphAreaShowGraph(
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110 new GraphView([this.url], this.graph.store, vc)
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111 );
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112 this.graphViewDirty = false;
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113 } else {
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114 this._graphAreaShowPending();
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115 }
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116 }
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117
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118 _graphAreaClose() {
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119 this._setGraphArea(html``);
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120 }
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121
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122 _graphAreaShowPending() {
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123 this._setGraphArea(html` <span>waiting for data...</span> `);
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124 }
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125
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126 async _graphAreaShowGraph(graphView: GraphView) {
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127 this._setGraphArea(await graphView.makeTemplate());
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128 }
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129
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130 _setGraphArea(tmpl: TemplateResult) {
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131 const el = this.shadowRoot?.getElementById("graphView");
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132 if (!el) {
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133 return;
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134 }
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135 render(tmpl, el);
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136 }
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137 }
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138
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139 declare global {
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140 interface HTMLElementTagNameMap {
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141 "streamed-graph": StreamedGraph;
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142 }
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143 }
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144
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145 // // allow child nodes to combine a few graphs and statics
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146 // //<streamed-graph id="timebankGraph" graph="{{graph}}" expanded="true">
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147 // // <member-graph url="graph/timebank/events"></member-graph>
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148 // // <member-graph url="/some/static.n3"></member-graph>
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149 // //</streamed-graph>