StockModel.qml Example File

demos/stocqt/content/StockModel.qml
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import QtQuick 2.0 ListModel { id: model property string stockId: "" property string stockName: "" property var newest property var oldest property bool ready: false property real stockPrice: 0.0 property real stockPriceChanged: 0.0 signal dataReady function indexOf(date) { if (model.count == 0) return -1; if (newest <= date) date = new Date(newest.getYear(), newest.getMonth(), newest.getDate() - 7); if (oldest >= date) return model.count - 1; var currDiff = 0; var bestDiff = Math.abs(date.getTime() - newest.getTime()); var retval = 0; for (var i = 0; i < model.count; i++) { var d = new Date(model.get(i).date); currDiff = Math.abs(d.getTime() - date.getTime()); if (currDiff < bestDiff) { bestDiff = currDiff; retval = i + 1; } if (currDiff > bestDiff) return retval; } return -1; } function createStockPrice(r) { return { "date": r[0], "open":r[1], "high":r[2], "low":r[3], "close":r[4], "volume":r[5], }; } function updateStock() { if (stockId === "") return; var startDate = new Date(2011, 4, 25); var endDate = new Date(); //today var req = "data/" + stockId + ".csv" if (!req) return; var xhr = new XMLHttpRequest; xhr.open("GET", req, true); model.ready = false; model.clear(); var i = 1; //skip the first line xhr.onreadystatechange = function() { if (xhr.readyState === XMLHttpRequest.LOADING || xhr.readyState === XMLHttpRequest.DONE) { var records = xhr.responseText.split('\n'); for (;i < records.length; i++ ) { var r = records[i].split(','); if (r.length >= 6) model.append(createStockPrice(r)); } if (xhr.readyState === XMLHttpRequest.DONE) { if (model.count > 0) { model.ready = true; model.stockPrice = model.get(0).close; model.stockPriceChanged = model.count > 1 ? (Math.round((model.stockPrice - model.get(1).close) * 100) / 100) : 0; newest = new Date(model.get(0).date); oldest = new Date(model.get(model.count - 1).date); } else { model.stockPrice = 0; model.stockPriceChanged = 0; } model.dataReady(); // emit signal - model.ready indicates whether the data is valid } } } xhr.send() } }