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Python 如何将动态创建的小部件绑定到PyQt中的信号?_Python_User Interface_Pyqt - Fatal编程技术网

Python 如何将动态创建的小部件绑定到PyQt中的信号?

Python 如何将动态创建的小部件绑定到PyQt中的信号?,python,user-interface,pyqt,Python,User Interface,Pyqt,我有一个表格,里面满是通过按下一个按钮创建的组合框。我的问题是如何找出哪个组合框发生了变化?如果它是一个固定的组合框,我将使用以下选项: QtCore.QObject.connect(self.comboBox, QtCore.SIGNAL(_fromUtf8("currentIndexChanged(int)")), self.dosomething) QtCore.QObject.connect(self.comboBox, QtCore.SIGNAL("currentIndexChang

我有一个表格,里面满是通过按下一个按钮创建的组合框。我的问题是如何找出哪个组合框发生了变化?如果它是一个固定的组合框,我将使用以下选项:

QtCore.QObject.connect(self.comboBox, QtCore.SIGNAL(_fromUtf8("currentIndexChanged(int)")), self.dosomething)
QtCore.QObject.connect(self.comboBox, QtCore.SIGNAL("currentIndexChanged(int)"), lambda index: self.dosomething(combo_id, index))
我添加了下面的示例代码,以使其更加清晰:

from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    _fromUtf8 = lambda s: s

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName(_fromUtf8("Dialog"))
        Dialog.resize(332, 122)
        Dialog.setMinimumSize(QtCore.QSize(332, 122))
        Dialog.setMaximumSize(QtCore.QSize(332, 122))
        self.tableWidget = QtGui.QTableWidget(Dialog)
        self.tableWidget.setGeometry(QtCore.QRect(10, 10, 256, 101))
        self.tableWidget.setObjectName(_fromUtf8("tableWidget"))
        self.tableWidget.setColumnCount(2)   
        item = QtGui.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(0, item)
        item = QtGui.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(1, item)
        self.tableWidget.setRowCount(0)
        self.layoutWidget_6 = QtGui.QWidget(Dialog)
        self.layoutWidget_6.setGeometry(QtCore.QRect(280, 30, 40, 54))
        self.layoutWidget_6.setObjectName(_fromUtf8("layoutWidget_6"))
        self.verticalLayout_2 = QtGui.QVBoxLayout(self.layoutWidget_6)
        self.verticalLayout_2.setMargin(0)
        self.verticalLayout_2.setObjectName(_fromUtf8("verticalLayout_2"))
        self.pushButton_2 = QtGui.QPushButton(self.layoutWidget_6)
        self.pushButton_2.setAutoDefault(False)
        self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))
        self.verticalLayout_2.addWidget(self.pushButton_2)
        self.pushButton = QtGui.QPushButton(self.layoutWidget_6)
        self.pushButton.setAutoDefault(False)
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.verticalLayout_2.addWidget(self.pushButton)

        QtCore.QObject.connect(self.pushButton_2, QtCore.SIGNAL(_fromUtf8("clicked()")), self.add)

        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
        self.pushButton_2.setText(QtGui.QApplication.translate("Dialog", "+", None, QtGui.QApplication.UnicodeUTF8))
        self.pushButton.setText(QtGui.QApplication.translate("Dialog", "-", None, QtGui.QApplication.UnicodeUTF8))
        item = self.tableWidget.horizontalHeaderItem(0)
        item.setText(QtGui.QApplication.translate("Dialog", "New Column", None, QtGui.QApplication.UnicodeUTF8))
        item = self.tableWidget.horizontalHeaderItem(1)
        item.setText(QtGui.QApplication.translate("Dialog", "New Column", None, QtGui.QApplication.UnicodeUTF8))

    def change(self):
        '''Depending on the comboBox whose index has changed,
         find the row and insert the right options in the comboBox
          in the next column'''

        #Find the row
        ins = self.tableWidget.focusWidget()
        selected_row = self.tableWidget.indexAt(ins.pos()).row()
        choice = self.tableWidget.cellWidget(0, selected_row).currentText()

        #Select the appropriate options
        if choice == 'B':
            choices_list = ['4', '5', '6']
        if choice == 'A':
            choices_list = ['1', '2', '3']

        #Set ComboBox in the next column
        comboBox = QtGui.QComboBox(self.tableWidget)
        font = QtGui.QFont()
        font.setPointSize(10)
        comboBox.setFont(font)

        for combo_ind, i in enumerate(choices_list):
            comboBox.addItem(_fromUtf8(""))
            comboBox.setItemText(combo_ind, QtGui.QApplication.translate("Dialog", i, None, QtGui.QApplication.UnicodeUTF8))

    def add(self):
        index = self.tableWidget.rowCount()
        self.tableWidget.insertRow(index)

        comboBox = QtGui.QComboBox(self.tableWidget)
        font = QtGui.QFont()
        font.setPointSize(10)
        comboBox.setFont(font)

        for combo_ind, i in enumerate(["A", "B"]):
            comboBox.addItem(_fromUtf8(""))
            comboBox.setItemText(combo_ind, QtGui.QApplication.translate("Dialog", i, None, QtGui.QApplication.UnicodeUTF8))     
        self.tableWidget.setCellWidget(index, 0, comboBox)

        comboBox = QtGui.QComboBox(self.tableWidget)
        font = QtGui.QFont()
        font.setPointSize(10)
        comboBox.setFont(font)

        #[1,2,3] is for A
        #[4,5,6] is for B
        for combo_ind, i in enumerate(['1', '2', '3']):
            comboBox.addItem(_fromUtf8(""))
            comboBox.setItemText(combo_ind, QtGui.QApplication.translate("Dialog", i, None, QtGui.QApplication.UnicodeUTF8))
        self.tableWidget.setCellWidget(index, 1, comboBox) 

app = QApplication(sys.argv)
app.setApplicationName('MyWindow')
window = QDialog()
ui = Ui_Dialog()
ui.setupUi(window)
window.show()
sys.exit(app.exec_())

您可以尝试使用
lambda
,如下所示

在您的情况下,它可能看起来如下所示:

QtCore.QObject.connect(self.comboBox, QtCore.SIGNAL(_fromUtf8("currentIndexChanged(int)")), self.dosomething)
QtCore.QObject.connect(self.comboBox, QtCore.SIGNAL("currentIndexChanged(int)"), lambda index: self.dosomething(combo_id, index))
您相应地更改了
self.dosomething
方法,以获取一个额外的参数(例如,某种ID)。这将允许您传递有关事件的一些标识信息,即事件发生在哪个组合框上,并且作为奖励,您可以对所有组件重复使用一种方法,即使添加了新的组件

另请注意:在您的情况下,信号将向插槽传递一个值(int)。您也需要该信息,因此您将其捕获为lambda的一个参数(上面我称之为
index
),并将其与信号用于哪个组合框的标识信息(
combo\u id
)一起传递给slot方法

如果您的信号没有向插槽发送任何参数,例如单击按钮,则不需要使用lambda参数,如下所示:

QtCore.QObject.connect(self.button, QtCore.SIGNAL("clicked()"), lambda: self.dosomething(button_id))

希望这有帮助。

您需要重新实现要动态创建的小部件。基本上也是这个问题的答案。

那么,如何获得组合id和索引呢?
索引是用户在组合框中设置的新索引(信号中传递的int),它是为您设置的。当您动态创建组合框时,您必须以某种方式设置组合id。。。你想怎么做就怎么做,我只是举个例子。您可以在创建组合框并将其信号连接到插槽的同时执行此操作,就像上面所做的那样。有意义吗?在您的
add
方法中,您创建了一个组合框,但我看不出您曾经将它的任何信号连接到插槽。看起来您就快到了,只需添加我们已经讨论过的
QtCore.QObject.connect
,添加一个方法(上面的
dosomething
)来处理事件,使用我在下面的答案中展示的lambda技巧,我想您已经掌握了。