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我将用一个小例子来演示我的问题：

import sys
from PySide import QtCore, QtGui

class TaskModel(QtCore.QAbstractTableModel):
    def __init__(self, tasks=[[" ", " ", " ", " "]]):
    # def __init__(self, tasks=[[]]):
        super().__init__()
        self.__tasks = tasks
        self.__headers = ["Folder", "Command", "Patterns", "Active", "Recursive"]

    def rowCount(self, *args, **kwargs):
        return len(self.__tasks)

    def columnCount(self, *args, **kwargs):
        coln = len(self.__tasks[0])
        return coln

    def headerData(self, section, orientation, role):
        if role == QtCore.Qt.DisplayRole:
            if orientation == QtCore.Qt.Horizontal:
                return self.__headers[section]
            else:
                # set row names: color 0, color 1, ...
                return "%s" % str(section+1)

    def data(self, index, role):
        row = index.row()
        col = index.column()
        value = self.__tasks[row][col]

        # text content
        if role == QtCore.Qt.DisplayRole:
            return value


    def insertRows(self, position, rows, parent=QtCore.QModelIndex()):
        self.beginInsertRows(parent, position, position + rows - 1)
        row = ["a", "b", "c", "d"]
        for i in range(rows):
            self.__tasks.insert(position, row)
        self.endInsertRows()
        return True

class Mc(QtGui.QWidget):
    def __init__(self):
        super().__init__()
        self.tab = QtGui.QTableView()
        self.model = TaskModel()
        self.tab.setModel(self.model)
        self.addbtn = QtGui.QPushButton("Add")
        self.addbtn.clicked.connect(self.insert)
        layout = QtGui.QVBoxLayout()
        layout.addWidget(self.tab)
        layout.addWidget(self.addbtn)
        self.setLayout(layout)

    def insert(self):
        self.model.insertRow(0)

app = QtGui.QApplication(sys.argv)
mc = Mc()
mc.show()
sys.exit(app.exec_())

请注意，我__init__对 TaskModel 类有两行函数，第一行给出 [[" ", " ", " ", " "]] 作为 __task 的默认数据集，第二行给出 [[]]。

第一个工作正常：

在此处输入图像描述

除了有一个不需要的行坐在底部。

第二个__init__函数在尝试删除不需要的行时，使用 [[]] 作为默认数据集，但结果是灾难性的：

在此处输入图像描述

如何删除不需要的底行，同时仍使其正常工作（使用标题和所有内容）？

4

1 回答 1

1

The reason why you have the extra row, is because you are forcing each instance of the table-model have one by setting it as the default argument. (Also, it is almost always a bug to use mutable objects as default arguments. If you do so, the same object will end up being shared between all instances of the class).

The problem with the missing headers is caused by the way you have implemented columnCount. If the first task in the list is empty, the column count will be zero, and so no headers will be shown.

Here's one way to fix these issues:

class TaskModel(QtCore.QAbstractTableModel):
    def __init__(self, tasks=None):
        super().__init__()
        self.__tasks = [] if tasks is None else tasks
        self.__headers = ["Folder", "Command", "Patterns", "Active", "Recursive"]

    def rowCount(self, *args, **kwargs):
        return len(self.__tasks)

    def columnCount(self, *args, **kwargs):
        if self.__tasks:
            return len(self.__tasks[0])
        return len(self.__headers)
于 2014-09-19T20:01:16.633 回答