chart-based route finding

src/charts/chart.js

@@ -1,10 +1,28 @@
 import {useChartOrderStore} from "@/orderbuild.js";
 import {invokeCallbacks, prototype} from "@/common.js";
-import datafeed from "@/charts/datafeed.js";
+import datafeed, {lookupSymbol} from "@/charts/datafeed.js";
 
 export let widget = null
 export let chart = null
 export let crosshairPoint = null
+let symbolChangedCbs = [] // callbacks for TV's chart.onSymbolChanged()
+let lastSymbolChangedArgs = null
+
+export function addSymbolChangedCallback(cb) {
+    symbolChangedCbs.push(cb)
+}
+
+export function removeSymbolChangedCallback(cb) {
+    symbolChangedCbs = symbolChangedCbs.filter((i)=>i!==cb)
+}
+
+function changeSymbol(symbol) {
+    console.log('tv changeSymbol', symbol)
+    const info = lookupSymbol(symbol.full_name)
+    lastSymbolChangedArgs = info
+    symbolChangedCbs.forEach((cb)=>cb(info))
+}
+
 
 const subscribeEvents = [
     'toggle_sidebar', 'indicators_dialog', 'toggle_header', 'edit_object_dialog', 'chart_load_requested',
@@ -51,7 +69,10 @@ function initChart() {
     console.log('init chart')
     chart = widget.activeChart()
     chart.crossHairMoved().subscribe(null, (point)=>setTimeout(()=>handleCrosshairMovement(point),0) )
+    chart.onSymbolChanged().subscribe(null, changeSymbol);
+    changeSymbol(chart.symbolExt())
     useChartOrderStore().chartReady = true
+    console.log('chart ready')
 }