Question

我已经在python中定义了自定义QAbstrtactTableModel，并实现了columnCount()，rowCount()，data()和headerData()，还向{{1} }新条目：

add()

数据是一个python字典，正在通过调用随机函数对其进行修改，该函数每1秒用1个条目填充字典，如下所示：

“ 0,0”：[随机值]
“ 0,1”：[随机值]
“ 0,2”：[随机值]
“ 1,0”：[随机值]
“ 1,1”：[随机值]
“ 1,2”：[随机值]

import sys from PySide2.QtUiTools import QUiLoader from PySide2.QtWidgets import QApplication, QMainWindow from PySide2.QtCore import QFile, QProcess, Signal,\ Slot, QObject, QThread, Qt, QAbstractTableModel, QModelIndex,\ QTimer import random class TableModel(QAbstractTableModel): def __init__(self, values): QAbstractTableModel.__init__(self) self.values = values def columnCount(self, parent=QModelIndex()): return 2 def rowCount(self, parent=QModelIndex()): return len(self.values) def data(self, index, role=Qt.DisplayRole): print("called") if 0 <= index.row() < self.rowCount() and 0 <= index.column() < self.columnCount(): if role == Qt.DisplayRole: print(index.row()) if index.column() == 0: return list(self.values.keys())[index.row()] else: return self.values[list(self.values.keys())[index.row()]] def add(self, data): self.values[data[0]] = data[1] def headerData(self, section, orientation, role=Qt.DisplayRole): if role == Qt.DisplayRole: if orientation == Qt.Horizontal: if section == 0: return "Parking,Meter" elif section == 1: return "Revenue" class Monitor(QObject): data_batch_ready = Signal(list) def __init__(self, parent=None): super(Monitor, self).__init__(parent) @Slot(list) def fill_batch(self): my_data = [] for parking in range(4): for index in range(10): my_data.append([str(parking)+","+str(index), random.randint(1,101)]) self.data_batch_ready.emit(my_data) class Gui(QMainWindow): system_process = QProcess() parking_model = TableModel(values={"0,0": "0"}) def __init__(self, parent=None): super(Gui, self).__init__(parent) file = QFile("minimal.ui") file.open(QFile.ReadOnly) loader = QUiLoader() ui = loader.load(file) self.setCentralWidget(ui) self.centralWidget().parking_table.setModel(self.parking_model) @Slot(list) def update_gui_revenue(self, data): print("fire") for row in data: self.parking_model.add(row) def main(): app = QApplication(sys.argv) gui = Gui() gui.show() thread = QThread() moni = Monitor() timer = QTimer(moni) timer.setInterval(1) moni.moveToThread(thread) moni.data_batch_ready.connect(gui.update_gui_revenue, Qt.QueuedConnection) timer.timeout.connect(moni.fill_batch, Qt.QueuedConnection) thread.started.connect(timer.start) thread.started.connect(lambda: print("time started")) thread.start() sys.exit(app.exec_()) if __name__ == "__main__": main()正确反映了数据rowCount()中的行数，但是values始终仅显示1行，而tableView仅请求{{1 }}

编辑：添加了data()

Answer 1

如果您不通知数据，模型将无法监视何时修改数据，在这种情况下，有两种类型的修改，第一种是行插入，另一种是更新。对于插入行，必须使用beginInsertRows()和endInsertRows()方法，对于第二行，必须通过启动dataChanged信号进行通知。

另一方面，不要在类中使模型变量变，而必须使它成为实例的变量。

import sys
from PySide2 import QtCore, QtWidgets, QtUiTools
import random


class TableModel(QtCore.QAbstractTableModel):
    def __init__(self, values={}, parent=None):
        super(TableModel, self).__init__(parent)
        self.values = values

    def columnCount(self, parent=QtCore.QModelIndex()):
        if parent.isValid(): return 0
        return 2

    def rowCount(self, parent=QtCore.QModelIndex()):
        if parent.isValid(): return 0
        return len(self.values)

    def data(self, index, role=QtCore.Qt.DisplayRole):
        if 0 <= index.row() < self.rowCount() and 0 <= index.column() < self.columnCount():
            if role == QtCore.Qt.DisplayRole:
                if index.column() == 0:
                    return list(self.values.keys())[index.row()]
                else:
                    return self.values[list(self.values.keys())[index.row()]]

    def add(self, data):
        key, value = data 
        if key in self.values:
            row = list(self.values.keys()).index(key)
            self.values[key] = value
            self.dataChanged.emit(self.index(row, 1), self.index(row, 1))
        else:
            self.add_row(key, value)

    def add_row(self, key, value):
        self.beginInsertRows(QtCore.QModelIndex(), self.rowCount(), self.rowCount())
        self.values[key] = value
        self.endInsertRows()

    def headerData(self, section, orientation, role=QtCore.Qt.DisplayRole):
        if role == QtCore.Qt.DisplayRole:
            if orientation == QtCore.Qt.Horizontal:
                if section == 0:
                    return "Parking,Meter"
                elif section == 1:
                    return "Revenue"


class Monitor(QtCore.QObject):
    data_batch_ready = QtCore.Signal(list)

    @QtCore.Slot(list)
    def fill_batch(self):
        my_data = []
        for parking in range(4):
            for index in range(10):
                my_data.append([str(parking)+","+str(index), random.randint(1,101)])
        self.data_batch_ready.emit(my_data)


class Gui(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(Gui, self).__init__(parent)
        file =QtCore.QFile("minimal.ui")
        file.open(QtCore.QFile.ReadOnly)
        self.parking_model = TableModel(values={"0,0": "0"}, parent=self)

        loader = QtUiTools.QUiLoader()
        ui = loader.load(file)
        self.setCentralWidget(ui)

        self.centralWidget().parking_table.setModel(self.parking_model)

    @QtCore.Slot(list)
    def update_gui_revenue(self, data):
        for row in data:
            self.parking_model.add(row)


def main():

    app = QtWidgets.QApplication(sys.argv)
    gui = Gui()
    gui.show()

    thread = QtCore.QThread()
    moni = Monitor()
    timer = QtCore.QTimer(moni)
    timer.setInterval(10)
    moni.moveToThread(thread)
    moni.data_batch_ready.connect(gui.update_gui_revenue, QtCore.Qt.QueuedConnection)
    timer.timeout.connect(moni.fill_batch, QtCore.Qt.QueuedConnection)
    thread.started.connect(timer.start)
    thread.started.connect(lambda: print("time started"))
    thread.start()
    app.aboutToQuit.connect(thread.quit)
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

QAbstractTabelModel.data（）总是获取index.row（）== 0并且仅显示1行

1 个答案: