如何使用pyqt4刷新小部件中的内容？

Question

在我的程序中，我从API获取数据。如果任何人订购了我希望在窗口中看到的数据，而无需重新打开应用程序。在这里我按下刷新按钮时我声明了这个功能我要更新数据但数据相同，但是当我按下刷新按钮时，相同的数据会加倍。下面给出的是我的示例代码，我提到了代替我的API的字典。如何更新数据。

from PyQt4 import QtCore, QtGui
import sys, collections
from functools import partial
class InfoWidget(QtGui.QWidget):
    clicked = QtCore.pyqtSignal()

    def __init__(self, info, parent=None):
        super(InfoWidget, self).__init__(parent)
        self._info = info

        date_label = QtGui.QLabel("{}   {}".format(info["Date"], info["Id"]), alignment= QtCore.Qt.AlignCenter, objectName="small")
        amount_label = QtGui.QLabel("Amount:{}".format(info["Amount"]))
        shopping_label = QtGui.QLabel("Shopping :{}".format(info["Shopping"]))
        ordercity_label = QtGui.QLabel("Order City :{}".format(info["Order_City"]))
        orderstate_label = QtGui.QLabel("Order State :{}".format(info["Order_State"]))
        hline = QtGui.QFrame(frameShape=QtGui.QFrame.HLine)

        lay = QtGui.QVBoxLayout(self)
        lay.addWidget(date_label)
        lay.addWidget(amount_label)
        lay.addWidget(shopping_label)
        lay.addWidget(ordercity_label)
        lay.addWidget(orderstate_label)
        lay.addWidget(hline)

    @property
    def info(self):
        return self._info

    def mousePressEvent(self, event):
        self.clicked.emit()
        super(InfoWidget, self).mousePressEvent(event)

class Orders(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(Orders, self).__init__(parent)
        self.Online_order_dict = [
            {"Date" : "jan-24-2019", "Id" : "#175", "Amount" : "191 rs", "Shopping" : "Online", "Order_City" : "Hyderbad", "Order_State" : "TELANGANA"},
            {"Date" : "jan-25-2019", "Id" : "#186", "Amount" : "200 Rs", "Shopping" : "Online", "Order_City" : "Hyderbad", "Order_State" : "TELANGANA"},
            {"Date" : "jan-29-2019", "Id" : "#188", "Amount" : "250 Rs", "Shopping" : "Online", "Order_City" : "Hyderbad", "Order_State" : "TELANGANA"},
            {"Date" : "jan-25-2019", "Id" : "#176", "Amount" : "200 Rs", "Shopping" : "Online", "Order_City" : "Hyderbad", "Order_State" : "TELANGANA"},
            {"Date" : "jan-28-2019", "Id" : "#201", "Amount" : "250 Rs", "Shopping" : "Online", "Order_City" : "Hyderbad", "Order_State" : "TELANGANA"}
        ]

        self.qvw1 = QtGui.QWidget()
        self.scrollArea = QtGui.QScrollArea(widgetResizable=True)
        self.scrollArea.setWidget(self.qvw1)

        self.online_order_hbox = QtGui.QVBoxLayout(self.qvw1)
        self.online_label = QtGui.QPushButton("Online Order")
        self.refreshlabel = QtGui.QPushButton("Refresh")
        self.refreshlabel.setStyleSheet("QPushButton{ background-color: #FF8C00; color: white;outline : None;}")
        self.refreshlabel.clicked.connect(self.refresh_orders)
        self.online_label.setStyleSheet("QPushButton{ background-color: #FF8C00; color: white;outline : None;}")
        self.online_order_hbox.addWidget(self.online_label,QtCore.Qt.AlignTop)
        self.online_order_hbox.addWidget(self.refreshlabel,QtCore.Qt.AlignBottom)
        self.qvw1.setFixedWidth(550)

        self.refresh_orders()
    def refresh_orders(self):
        for i in self.Online_order_dict:

            w = InfoWidget(i)
            w.clicked.connect(self.on_info_clicked)
            self.online_order_hbox.addWidget(w)
        self.setCentralWidget(self.scrollArea)

    #self.Online_order_dict = self.result_data[1]
    # for j in self.Online_order_dict:
    #     l=j['created'].split("T")
    #     self.online = {"Date": str(l[0]),"Id" : "#"+str(j['pk']),"Total Amount":str(j['totalAmount']),"Order City":j['billingCity'],"Order State":j['billingState']}
    #     onlineList.append(self.online)
    # 
    # for index, i in enumerate(onlineList):
    #     w = InfoWidget1(index, i)
    #     w.clicked.connect(partial(self.on_info_clicked,"online"))
    #     self.online_order_hbox.addWidget(w)

    @QtCore.pyqtSlot()
    def on_info_clicked(self):
        w = self.sender()
        print(w.info)

if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    settingobj= Orders()
    settingobj.showFullScreen()
    sys.exit(app.exec_())

Answer 1

在这种情况下最简单的解决方案是在添加新的InfoWidget之前删除InfoWidget，为此我们可以通过findChildren()方法获取它们：

def refresh_orders(self):
    for w in self.online_order_hbox.parentWidget().findChildren(InfoWidget):
        w.deleteLater()
    for i in self.Online_order_dict:
        w = InfoWidget(i)
        w.clicked.connect(self.on_info_clicked)
        self.online_order_hbox.addWidget(w)
    self.setCentralWidget(self.scrollArea)