如何使用pyqt4刷新小部件中的内容？

Question

Here in my program I get the data from API. If any one ordered that data I want to see in my window without reopen the app. Here I declared the function when I press the refresh button I want to update data but same data, but when I press refresh button same data is adding in double times. Given below is my sample code here I mention dictionaries in place of my API. How can I update the data.

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

The simplest solution in this case is to remove the InfoWidget before adding the new ones, for this we can obtain them through findChildren() method:

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)