编辑2 vvvvv

Question

我在qTableWidget列9中设置了我的按钮。它包含3个值，因此当它被点击时，它会将带有这些值的信号发送到我的主要触发DoSomething()方法的主要信号。问题是这条线消耗的时间很长self.tableWidget.setCellWidget(i,9, button)。这是我的按钮的代码，PopulateTable()方法输出问题：

class MyPushButton(QtGui.QPushButton):
    def __init__(self, value1, value2, value3, main):
        super(MyPushButton, self).__init__()
        self.__value1   = value1
        self.__value2   = value2
        self.__value3   = value3
        self.__main     = main
        self.connect(self, QtCore.SIGNAL('clicked()'), self, QtCore.SLOT("triggerOutput()"))

    @QtCore.pyqtSlot()
    def triggerOutput(self):
        self.__main.emit(QtCore.SIGNAL("DoSomethingSignal(PyQt_PyObject, PyQt_PyObject, PyQt_PyObject)"), self.__value1 , self.__value2 , self.__value3)

我PopulateTable()中的

class PYQTEmaszForm(QtGui.QMainWindow)方法：

def PopulateTable(self, numberOfRows, rows):

编辑2 vvvvv

    self.tableWidget.setColumnCount(10)
    self.tableWidget.setEditTriggers(QtGui.QAbstractItemView.NoEditTriggers)
    self.tableWidget.setSelectionMode(QtGui.QAbstractItemView.NoSelection)
    self.tableWidget.setFocusPolicy(QtCore.Qt.NoFocus)
    self.tableWidget.verticalHeader().hide()
    self.tableWidget.setVerticalScrollMode(QtGui.QAbstractItemView.ScrollPerPixel)
#next line was the problem
    #self.tableWidget.verticalHeader().setResizeMode(QtGui.QHeaderView.ResizeToContents)
    self.tableWidget.horizontalHeader().setResizeMode(QtGui.QHeaderView.Fixed)
    self.tableWidget.resizeColumnsToContents()

的 ^^^^^

    self.tableWidget.setVisible(0)
    self.tableWidget.setSortingEnabled(0)
    self.tableWidget.setRowCount(numberOfRows)

    for i in range(0,numberOfRows):
        #I set columns 0-8 here like this self.tableWidget.setItem(i, colNum, QtGui.QTableWidgetItem(rows[i][colNum]))  

        #here is my problem:
        button = MyPushButton(value1, value2, value3, self)# note that tose 3 values I can get only here, in a loop, so I must store them in my button that I use as link
        button.setText("Click to do something")
        startTime = time.time()
        self.tableWidget.setCellWidget(i,9, button)
        print i," self.tableWidget.setCellWidget(i,9, button) time: ", time.time() - startTime

    self.tableWidget.resizeColumnsToContents()
    self.tableWidget.setSortingEnabled(1)
    self.tableWidget.sortByColumn(0,QtCore.Qt.AscendingOrder)
    self.tableWidget.setVisible(1)

每行增加cetCellWidget的时间。这是我获得的325行：

0 self.tableWidget.setCellWidget(i,9, button) time:  0.010999917984
1 self.tableWidget.setCellWidget(i,9, button) time:  0.0119998455048
2 self.tableWidget.setCellWidget(i,9, button) time:  0.0130000114441
3 self.tableWidget.setCellWidget(i,9, button) time:  0.0150001049042
# ....
100 self.tableWidget.setCellWidget(i,9, button) time:  0.141999959946
101 self.tableWidget.setCellWidget(i,9, button) time:  0.134000062943
102 self.tableWidget.setCellWidget(i,9, button) time:  0.144999980927
103 self.tableWidget.setCellWidget(i,9, button) time:  0.151000022888
# ....
321 self.tableWidget.setCellWidget(i,9, button) time:  0.209000110626
322 self.tableWidget.setCellWidget(i,9, button) time:  0.211999893188
323 self.tableWidget.setCellWidget(i,9, button) time:  0.213000059128
324 self.tableWidget.setCellWidget(i,9, button) time:  0.212000131607

所以填充表持续超过1分钟。

我的问题是为什么setCellWidget需要这么多时间以及为什么时间在增长？

我做错了什么？

EDIT1 我尝试过这样设置简单QPushButton：button = QtGui.QPushButton()，setCellWidget方法的时间消耗没有差异。所以它不依赖于MyPushButton小部件。

Answer 1

问题是setCellWidget只是一种方便的方法：它没有针对在单个表中添加数百个小部件进行优化，因此您看到的性能降低是不可避免的。

要获得最佳性能，您必须创建自定义委托，并使用QStyle在其paint方法中绘制按钮。当然，这也意味着你必须自己实现所有鼠标处理等等。

为了让您了解所涉及的内容，可以找到一些示例代码here。

修改：

这是一个基于问题中原始代码的测试脚本。对我来说，这在325行内完成了几分之一秒：

import time from PyQt4 import QtCore, QtGui class MyPushButton(QtGui.QPushButton): def __init__(self, value1, value2, value3, main): super(MyPushButton, self).__init__() self.__value1 = value1 self.__value2 = value2 self.__value3 = value3 self.__main = main self.connect(self, QtCore.SIGNAL('clicked()'), self, QtCore.SLOT("triggerOutput()")) @QtCore.pyqtSlot() def triggerOutput(self): self.__main.emit(QtCore.SIGNAL("DoSomethingSignal(PyQt_PyObject, PyQt_PyObject, PyQt_PyObject)"), self.__value1 , self.__value2 , self.__value3) class Window(QtGui.QWidget): def __init__(self): QtGui.QWidget.__init__(self) self.table = QtGui.QTableWidget(self) self.button = QtGui.QPushButton('Populate', self) self.button.clicked.connect(self.handleButton) layout = QtGui.QVBoxLayout(self) layout.addWidget(self.table) layout.addWidget(self.button) def handleButton(self): self.populateTable(325) def populateTable(self, numberOfRows): self.table.setVisible(0) self.table.setSortingEnabled(0) self.table.setRowCount(numberOfRows) self.table.setColumnCount(10) for i in range(0, numberOfRows): for colNum in range(10): text = 'Text(%d, %d)' % (i, colNum) self.table.setItem(i, colNum, QtGui.QTableWidgetItem(text)) button = MyPushButton(1, 2, 3, self) button.setText("Click") startTime = time.time() self.table.setCellWidget(i,9, button) print i," self.tableWidget.setCellWidget(i,9, button) time: ", time.time() - startTime self.table.resizeColumnsToContents() self.table.setSortingEnabled(1) self.table.sortByColumn(0, QtCore.Qt.AscendingOrder) self.table.setVisible(1) if __name__ == '__main__': import sys app = QtGui.QApplication(sys.argv) window = Window() window.setGeometry(600, 300, 1000, 600) window.show() sys.exit(app.exec_())

<强>更新：

我不确定完全你想要什么，但是可以通过在填充表格之前将resize-mode设置为Fixed来解决行调整大小问题，然后设置它之后到ResizeToContents：

... self.tableWidget.horizontalHeader().setResizeMode(QtGui.QHeaderView.Fixed) self.tableWidget.verticalHeader().setResizeMode(QtGui.QHeaderView.Fixed) # populate table self.table.verticalHeader().setResizeMode(QtGui.QHeaderView.ResizeToContents) self.table.resizeColumnsToContents() self.tableWidget.setSortingEnabled(1) self.tableWidget.sortByColumn(0, QtCore.Qt.AscendingOrder)

将自定义pushButton设置为单元格小部件会消耗很多时间

编辑2 vvvvv

的 ^^^^^

1 个答案: