使用 QAbstractTableModel 在 pyqts QTableView 中插入和删除行

Question

如何使用 QAbstractTableModel 在 QTableView 中插入和删除单行。

将在一个单独的线程中给出一个新行，该线程通过 pyqtsignal 连接到 QAbstractTableModel。 目标是每次给出新的发射时添加一行。如果表格达到 10 行的最大数量，则应添加新发出的行并删除第一行。所以我有一个 maxlen 为 10 个条目的运行表。

目前一切正常，除了删除和添加一行

import sys
import time
from PyQt5.QtWidgets import QApplication, QMainWindow, QToolBar, QAction, QTableView
from PyQt5.QtCore import QSize, Qt,QAbstractTableModel, pyqtSlot, pyqtSignal, QThread

import sys
import time
from PyQt5.QtWidgets import QApplication, QMainWindow, QToolBar, QAction, QTableView
from PyQt5.QtCore import QSize, Qt,QAbstractTableModel, pyqtSlot, pyqtSignal, QThread

class Table(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.resize(800, 600)
        self.setMinimumSize(QSize(800, 600))

        self.table = QTableView()
        self.setCentralWidget(self.table)

        toolbar = QToolBar("Toolbar")
        con = QAction("Connect", self)
        con.triggered.connect(self.updateTable)
        discon = QAction("Disconnect", self)
        discon.triggered.connect(self.terminateThread)

        toolbar.addAction(con)
        toolbar.addAction(discon)
        self.addToolBar(toolbar)

    def updateTable(self):
        print("Connect")
        data = [
            ["This", "is", "test", 1],
            ["This", "is", "test", 2],
            ["This", "is", "test", 3],
        ]

        self.model = TableModel(data)
        self.table.setModel(self.model)

        self.thread = QTableThread()
        self.thread.sig1.connect(self.model.addRow)
        self.thread.start()

    def terminateThread(self):
        self.thread1.terminate()

class QTableThread(QThread):
    sig1 = pyqtSignal(list)

    def __init__(self):
        super(QTableThread, self).__init__()
        self.count = 4

    def run(self):
        for i in range(20):
            self.sig1.emit(["This", "is", "test", self.count])
            self.count += 1
            time.sleep(0.5)

class TableModel(QAbstractTableModel):
    def __init__(self, data):
        super(TableModel, self).__init__()
        self._data = data

    def data(self, index, role):
        if role == Qt.DisplayRole:
            return self._data[index.row()][index.column()]

    def rowCount(self, index):
        return len(self._data)

    def columnCount(self, index):
        return len(self._data[0])

    @pyqtSlot(list)
    def addRow(self,status):
        print(status)
        # What to implement here?


if __name__ == "__main__":
    app = QApplication(sys.argv)
    win = Table()
    win.show()
    sys.exit( app.exec_() )

Answer 1

我已为您标记了我所做的更改。试试看：

import sys
#import time
from PyQt5.QtWidgets import QApplication, QMainWindow, QToolBar, QAction, QTableView
from PyQt5.QtCore import (QSize, Qt, QAbstractTableModel, pyqtSlot, pyqtSignal, 
    QThread, QModelIndex)


class QTableThread(QThread):
    sig1 = pyqtSignal(list)

    def __init__(self):
        super(QTableThread, self).__init__()
        self.count = 4

    def run(self):
        for i in range(20):
            self.sig1.emit(["This", "is", "test", self.count])
            self.count += 1
            self.msleep(500)                                            # !!!


class TableModel(QAbstractTableModel):
    def __init__(self, _data):
        super(TableModel, self).__init__()
        self._data = _data

    def data(self, index, role):
        if role == Qt.DisplayRole:
            return self._data[index.row()][index.column()]

    def rowCount(self, index=QModelIndex()):                     # +
        return  0 if index.isValid() else len(self._data)        # +

    def columnCount(self, index=QModelIndex()):                  
        return len(self._data[0])

# +++ vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
    def insertRows(self, new_row, position, rows, parent=QModelIndex()):
        position = (position + self.rowCount()) if position < 0 else position
        start = position
        end = position + rows - 1

        if end <= 8:
            self.beginInsertRows(parent, start, end)
            self._data.append(new_row) 
            self.endInsertRows()
            return True
        else:
            self.beginInsertRows(parent, start, end)
            self._data.append(new_row) 
            self.endInsertRows()
            self.removeRows(0, 0)
            return True

    def removeRows(self, position, rows, parent=QModelIndex()):
        start, end = position, rows 
        self.beginRemoveRows(parent, start, end)
        del self._data[start:end + 1]
        self.endRemoveRows()
        return True
# +++ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^


class Table(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.resize(800, 600)
        self.setMinimumSize(QSize(800, 600))

        self.table = QTableView()
        self.setCentralWidget(self.table)

        toolbar = QToolBar("Toolbar")
        con = QAction("Connect", self)
        con.triggered.connect(self.updateTable)
        discon = QAction("Disconnect", self)
        discon.triggered.connect(self.terminateThread)

        toolbar.addAction(con)
        toolbar.addAction(discon)
        self.addToolBar(toolbar)
        
        self.thread = None                                                             # +++

    def updateTable(self):
        print("Connect")
        data = [
            ["This", "is", "test", 1],
            ["This", "is", "test", 2],
            ["This", "is", "test", 3],
        ]
        self.model = TableModel(data)
        self.table.setModel(self.model)

        self.thread = QTableThread()
#        self.thread.sig1.connect(self.model.addRow)                                    # ---
        self.thread.sig1.connect(lambda new_row: self.model.insertRows(new_row, -1, 1)) # +++
        self.thread.start()

    def terminateThread(self):
        if self.thread and self.thread.isRunning():                                     # +++
            self.thread.terminate()
        

if __name__ == "__main__":
    app = QApplication(sys.argv)
    win = Table()
    win.show()
    sys.exit( app.exec_() )