Question

我有一个保存大量数据的QTableView，并且我正在尝试实现复制/粘贴功能，但是.selectedIndexes()和.data()的性能却很慢。我想加快此过程...复制粘贴到Excel中的1000x1000单元是瞬时的，但是在我的代码中，仅5秒钟即可获取表的索引，然后15秒钟即可读取所有索引。

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

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

    def columnCount(self, parent=None):
        return self.df.columns.size

    def rowCount(self, parent=None):
        return self.df.index.size

    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.df.iat[row,col])

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

        self.setModel(TableModel(df))

        self.horizontalHeader().hide()
        self.verticalHeader().hide()

    def copy(self):
        # Set up clipboard object
        app = QtWidgets.QApplication.instance()
        if not app:
            app = QtWidgets.QApplication(sys.argv)
        clipboard = app.clipboard()

        a = time.time()
        indexes = self.selectedIndexes()
        b = time.time()
        print('selectedIndexes runtime:',b-a)
        data_time = 0

        text = ""
        prev_row = None
        for ix in indexes:
            if prev_row is None:
                prev_row = ix.row()
            a = time.time()
            value = str(self.model().data(self.model().index(ix.row(), ix.column()), role=Qt.DisplayRole))
            b = time.time()

            data_time += b-a
            if text == "":
                # First item
                text = value
            elif ix.row() != prev_row:
                # New row
                text += '\n' + value
                prev_row = ix.row()
            else:
                text += '\t' + value
        print('.data runtime:', data_time)

        clipboard.setText(text)

    def keyPressEvent(self, event):

        QtWidgets.QTableView.keyPressEvent(self, event)

        if event.matches(QtGui.QKeySequence.Copy):
            print('Ctrl + C')
            self.copy()

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

    df = pd.DataFrame(np.random.randn(1000, 1000))

    view = TableView(df)
    view.show()

    sys.exit(app.exec_())

输出

selectedIndexes runtime: 4.855096101760864
.data runtime: 17.418293476104736

PyQt提高索引和读取QTableView的速度？

0 个答案: