QTableView horizo​​ntalHeader使其很滞后吗?

时间:2019-05-08 08:02:41

标签: python pyqt pyqt5 qtableview

我有下面的代码,我注意到当我按ctrl + A来选择所有行时,感觉有些迟钝,大约需要1秒钟才能完成选择。但是,我还注意到,如果用self.horizontalHeader().hide()隐藏水平标题,则滞后完全消失了!为什么会这样?而如何摆脱滞后但保留标题呢?

from PyQt5 import QtGui, QtCore, QtWidgets
from PyQt5.QtCore import Qt
import pandas as pd
import numpy as np
import sys

class SeriesModel(QtCore.QAbstractTableModel):
    def __init__(self, series):
        super().__init__()
        self.series = series

    def columnCount(self, parent=None):
        return 1

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

    def data(self, index, role=None):
        row = index.row()
        col = index.column()
        if role == QtCore.Qt.DisplayRole or role == QtCore.Qt.ToolTipRole:
            return str(self.series[row])

    # The headers of this table will show the level names of the MultiIndex
    def headerData(self, section, orientation, role=None):
        if role in [QtCore.Qt.DisplayRole, QtCore.Qt.ToolTipRole]:
            if orientation == Qt.Horizontal:
                return str(self.series.name)

class SeriesView(QtWidgets.QTableView):
    def __init__(self, series):
        super().__init__()

        self.setModel(SeriesModel(series))

        # self.horizontalHeader().hide()

# Examples
if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)

    series = pd.Series(np.random.randn(1000000)).rename('MyData')

    view = SeriesView(series)
    view.show()

    sys.exit(app.exec_())

1 个答案:

答案 0 :(得分:2)

问题在于QTableView标头中默认启用了highlightSections属性。此属性意味着,如果选择了某个项目,则标头中暗示重绘的项目也会被选中,在您的情况下,您有1000000,因此它将被重绘类似的次数。因此,可能的解决方案是禁用该属性:

class SeriesView(QtWidgets.QTableView):
    def __init__(self, series):
        super().__init__()
        self.setModel(SeriesModel(series))
        self.horizontalHeader().setHighlightSections(False)