Qt 5.11 | Qt Quick | Qt Quick Demo - StocQt | StockListModel.qml Example File

Qt 5.11.3 Reference Documentation

# StockListModel.qml Example File

demos/stocqt/content/StockListModel.qml

      /****************************************************************************
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      import QtQuick 2.0

      ListModel {
          id: stocks

          // pre-fetch data for all entries
          Component.onCompleted: {
              for (var idx = 0; idx < count; ++idx) {
                  getCloseValue(idx)
              }
          }

          function getCloseValue(index) {

              var endDate = new Date(); // today
              var startDate = new Date();
              endDate.setDate(startDate.getDate() - 1);
              startDate.setDate(endDate.getDate() - 7);

              var req = "data/" + get(index).stockId + ".csv"

              var xhr = new XMLHttpRequest;

              xhr.open("GET", req, true);

              xhr.onreadystatechange = function() {
                  if (xhr.readyState === XMLHttpRequest.LOADING || xhr.readyState === XMLHttpRequest.DONE) {
                      var records = xhr.responseText.split('\n');
                      var unknown = "n/a";
                      set(index, {"value": unknown, "change": unknown, "changePercentage": unknown});
                      if (records.length > 0 && xhr.status == 200) {
                          var r = records[1].split(',');
                          var today = parseFloat(r[4]);

                          if (!isNaN(today))
                              setProperty(index, "value", today.toFixed(2));
                          if (records.length > 2) {
                              r = records[2].split(',');
                              var yesterday = parseFloat(r[4]);
                              var change = today - yesterday;

                              if (change >= 0.0)
                                  setProperty(index, "change", "+" + change.toFixed(2));
                              else
                                  setProperty(index, "change", change.toFixed(2));

                              var changePercentage = (change / yesterday) * 100.0;
                              if (changePercentage >= 0.0)
                                  setProperty(index, "changePercentage", "+" + changePercentage.toFixed(2) + "%");
                              else
                                  setProperty(index, "changePercentage", changePercentage.toFixed(2) + "%");
                          }
                      }
                  }
              }
              xhr.send()
          }
          // Uncomment to test invalid entries
          // ListElement {name: "The Qt Company"; stockId: "TQTC"; value: "999.0"; change: "0.0"; changePercentage: "0.0"}

          // Offline data downloaded using the url, https://www.quandl.com/api/v3/datasets/WIKI/<stockId>.csv.
          ListElement {name: "Advanced Micro Devices Inc."; stockId: "AMD"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "Amazon.com Inc."; stockId: "AMZN"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "Apple Inc."; stockId: "AAPL"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "Autodesk Inc."; stockId: "ADSK"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "Cisco Systems Inc."; stockId: "CSCO"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "eBay Inc."; stockId: "EBAY"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "Electronic Arts Inc."; stockId: "EA"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "Intel Corp."; stockId: "INTC"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "Microsoft Corp."; stockId: "MSFT"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "NetApp Inc."; stockId: "NTAP"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "Netflix Inc."; stockId: "NFLX"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "Norwegian Cruise Line Holdings Ltd."; stockId: "NCLH"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "NVIDIA Corp."; stockId: "NVDA"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "PayPal Holdings Inc."; stockId: "PYPL"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "QUALCOMM Inc."; stockId: "QCOM"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "Tesla Motors Inc."; stockId: "TSLA"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "Texas Instruments Inc."; stockId: "TXN"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
          ListElement {name: "Facebook Inc."; stockId: "FB"; value: "0.0"; change: "0.0"; changePercentage: "0.0"}
      }