QTableView 的 setCurrentIndex 将 currentIndex 放到了错误的地方

Question

我有一个 QTableView，我在上面覆盖了 keyPressEvent 方法，例如当用户按下右下角的 tab 键时，一个新行附加到基础 (pandas) 模型。完成后，我希望当前索引位于新的右下角。这是一个原则上应该完成工作的分类示例：

from PyQt5 import QtCore, QtWidgets

class DL50TableView(QtWidgets.QTableView):

    def keyPressEvent(self, event):

        key = event.key()

        model = self.model()

        current_index = self.currentIndex()
        row = current_index.row()
        column = current_index.column()

        if key == QtCore.Qt.Key_Tab:
            if column == model.columnCount() - 1 and row == model.rowCount() - 1:
                model.insertRows(model.rowCount())
                index = model.index(model.rowCount() - 1,model.columnCount() - 1)
                self.setCurrentIndex(index)

        elif key == QtCore.Qt.Key_Backspace:
            if column == 0 and row == model.rowCount() - 1:
                model.removeRows(model.rowCount() - 1)
                index = model.index(model.rowCount() - 1,0)
                self.setCurrentIndex(index)

        super(DL50TableView, self).keyPressEvent(event)  

import pandas as pd

from PyQt5 import QtCore, QtGui

class DL50Model(QtCore.QAbstractTableModel):

    def __init__(self, *args, **kwargs):

        super(DL50Model,self).__init__(*args, **kwargs)        

        self._data = pd.DataFrame([self.default_line()], columns=['include',
                                                                  'dose',
                                                                  'response',
                                                                  'nominal',
                                                                  'log10(dose)',
                                                                  'contrib.\ndae',
                                                                  'prob.\nof\nresponse',
                                                                  'likelihood\ncontrib.',
                                                                  'prob.\nof\nresponse\n(sub)',
                                                                  'likelihood\ncontrib.\n(sub)',
                                                                  'prob.\nof\nresponse\n(over)',
                                                                  'likelihood\ncontrib.\n(over)'])

    def columnCount(self, parent=None):
        return len(self._data.columns)

    def data(self, index, role):

        if not index.isValid():
            return False

        row = index.row()
        col = index.column()
        if role == QtCore.Qt.BackgroundRole and col >= 3:
            return QtGui.QBrush(QtCore.Qt.gray)
        elif role == QtCore.Qt.CheckStateRole and col in [0,2,3]:
            return self._data.iloc[row][col]
        elif role == QtCore.Qt.DisplayRole:
            if col in [0,2,3]:
                return None
            return str(self._data.iloc[row][col])
        return None

    def default_line(self):
        return [False, 0.0,False, False, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
    
    def insertRows(self, position, rows=1, index=QtCore.QModelIndex()):
        """Insert row(s) into the model.
        
        Args:
            position (int): the position of the row(s) to iunsert
            rows (int): the number of rows to insert
            index (QModelIndex): the parent index
        """
        
        self.beginInsertRows(QtCore.QModelIndex(), position, position + rows - 1)

        default = [self.default_line()]*rows
        lines = pd.DataFrame(default, columns=self._data.columns)
        self._data = pd.concat([self._data.iloc[:position], lines, self._data.iloc[position:]]).reset_index(drop=True)

        self.endInsertRows()

        return True

    def removeRows(self, position, rows=1, parent=QtCore.QModelIndex()):
        """Remove row(s) from the model.

        Args:
            position (int): the position of the row(s) to delete
            rows (int): the number of rows to delete
            index (QModelIndex): the parent index
        """

        self.beginRemoveRows(QtCore.QModelIndex(), position, position + rows - 1)

        print('BEFORE', len(self._data.index))
        self._data.drop(self._data.index[position:position+rows], inplace=True)
        print('AFTER', len(self._data.index))

        self.endRemoveRows()

        return True

    def rowCount(self, parent=None):
        return len(self._data.index)

当 运行 该代码时，当我按 Tab 但 时实际上会附加一个新行， currentIndex 设置为 (0,0)正如我编写的代码所期望的那样位于右下角。你知道我的 view/model 有什么问题吗？

Answer 1

通过覆盖 keyPressEvent 方法，因为在实现您的自定义逻辑后，您将调用选项卡用于移动 currentIndex 的默认代码，并且由于您的 currentIndex 位于 bottonRight 中，因此它将移动到 topLeft。

一种可能的解决方案是使用“return”语句来阻止 运行 的默认行为：

# ...
if key == QtCore.Qt.Key_Tab:
    if column == model.columnCount() - 1 and row == model.rowCount() - 1:
        model.insertRows(model.rowCount())
        index = model.index(model.rowCount() - 1, model.columnCount() - 1)
        self.setCurrentIndex(index)
        <b>return</b>
# ...