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annotate src/index.ts @ 84:067d66a45a51

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enable more code. factor out setGraphView
author drewp@bigasterisk.com
date Wed, 17 Nov 2021 16:45:10 -0800
parents b973d7f95fdf
children 6ec759f9009f
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1 import { LitElement, html, css, render, TemplateResult } from "lit";
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2 import { customElement, property } from "lit/decorators.js";
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4 import { Store } from "n3";
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6 import { GraphView } from "./graph_view";
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7 import { StreamedGraphClient } from "./streamed_graph_client";
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8 import { style, addFontToRootPage } from './style';
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9
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10 // export * from "./graph_queries";
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12 export interface VersionedGraph {
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13 version: number;
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14 store: Store;
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15 }
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17 @customElement("streamed-graph")
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18 export class StreamedGraph extends LitElement {
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19 @property({ type: String })
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20 url: string = "";
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22 @property({ type: Object })
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23 graph!: VersionedGraph;
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25 @property({ type: Boolean })
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26 expanded: boolean = false;
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27
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28 @property({ type: String })
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29 status: string = "";
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31 sg!: StreamedGraphClient;
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32 graphViewDirty = true;
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34 static styles=style;
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35 render() {
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36 const expandAction = this.expanded ? "-" : "+";
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37 return html`
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38 <div id="ui">
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39 <span class="expander"
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40 ><button @click="${this.toggleExpand}">${expandAction}</button></span
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41 >
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42 StreamedGraph <a href="${this.url}">[source]</a>: ${this.status}
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43 </div>
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44 <div id="graphView"></div>
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45 `;
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46 }
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48 connectedCallback() {
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49 super.connectedCallback();
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50 addFontToRootPage();
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51 const emptyStore = new Store();
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52 this.graph = { version: -1, store: emptyStore };
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54 this._onUrl(this.url); // todo: watch for changes and rebuild
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55 if (this.expanded) {
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56 this.redrawGraph();
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57 }
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58 }
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60 toggleExpand() {
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61 this.expanded = !this.expanded;
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62 if (this.expanded) {
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63 this.redrawGraph();
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64 } else {
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65 this.graphViewDirty = false;
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66 this._graphAreaClose();
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67 }
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68 }
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70 redrawGraph() {
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71 this.graphViewDirty = true;
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72 requestAnimationFrame(this._redrawLater.bind(this));
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73 }
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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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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 _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 this._graphAreaShowGraph(new GraphView(this.url, this.graph.store));
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108 this.graphViewDirty = false;
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109 } else {
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110 this._graphAreaShowPending();
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111 }
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112 }
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113
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114 _graphAreaClose() {
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115 this._setGraphArea(html``);
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116 }
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117
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118 _graphAreaShowPending() {
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119 this._setGraphArea(html` <span>waiting for data...</span> `);
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120 }
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121
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122 _graphAreaShowGraph(graphView: GraphView) {
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123 this._setGraphArea(graphView.makeTemplate());
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124 }
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125
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126 _setGraphArea(tmpl: TemplateResult) {
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127 const el = this.shadowRoot?.getElementById("graphView");
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128 if (!el) {
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129 return;
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130 }
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131 render(tmpl, el);
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132 }
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133 }
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134
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135 // // allow child nodes to combine a few graphs and statics
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136 // //<streamed-graph id="timebankGraph" graph="{{graph}}" expanded="true">
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137 // // <member-graph url="graph/timebank/events"></member-graph>
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138 // // <member-graph url="/some/static.n3"></member-graph>
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139 // //</streamed-graph>