Qt Quick 演示 - StocQt
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IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/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"} }