按钮的单按钮事件处理程序

时间：2012-11-21 17:14:20

标签： python qt button pyqt4 signals-slots

我想创建一个带有一些按钮的GUI应用程序，并希望以相同的方式处理按钮按下事件（即所有按键按下的单个事件句柄）。但我不明白button_hanlder如何理解按下了哪个按钮。

这是代码

from PyQt4 import QtCore, QtGui

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

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(800, 600)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.pushButton = QtGui.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(350, 190, 98, 27))
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.pushButton_2 = QtGui.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(240, 220, 98, 27))
        self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))
        self.pushButton_3 = QtGui.QPushButton(self.centralwidget)
        self.pushButton_3.setGeometry(QtCore.QRect(350, 250, 98, 27))
        self.pushButton_3.setObjectName(_fromUtf8("pushButton_3"))
        self.pushButton_4 = QtGui.QPushButton(self.centralwidget)
        self.pushButton_4.setGeometry(QtCore.QRect(460, 220, 98, 27))
        self.pushButton_4.setObjectName(_fromUtf8("pushButton_4"))
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtGui.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 25))
        self.menubar.setObjectName(_fromUtf8("menubar"))
        self.menuFile = QtGui.QMenu(self.menubar)
        self.menuFile.setObjectName(_fromUtf8("menuFile"))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName(_fromUtf8("statusbar"))
        MainWindow.setStatusBar(self.statusbar)
        self.menubar.addAction(self.menuFile.menuAction())

        self.retranslateUi(MainWindow)
        QtCore.QObject.connect(self.pushButton_2, QtCore.SIGNAL(_fromUtf8("pressed()")), self.button_handler)
        QtCore.QObject.connect(self.pushButton, QtCore.SIGNAL(_fromUtf8("pressed()")), self.button_handler)
        QtCore.QObject.connect(self.pushButton_4, QtCore.SIGNAL(_fromUtf8("pressed()")), self.button_handler)
        QtCore.QObject.connect(self.pushButton_3, QtCore.SIGNAL(_fromUtf8("pressed()")), self.button_handler)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(QtGui.QApplication.translate("MainWindow", "MainWindow", None, QtGui.QApplication.UnicodeUTF8))
        self.pushButton.setText(QtGui.QApplication.translate("MainWindow", "Up", None, QtGui.QApplication.UnicodeUTF8))
        self.pushButton_2.setText(QtGui.QApplication.translate("MainWindow", "Right", None, QtGui.QApplication.UnicodeUTF8))
        self.pushButton_3.setText(QtGui.QApplication.translate("MainWindow", "Down", None, QtGui.QApplication.UnicodeUTF8))
        self.pushButton_4.setText(QtGui.QApplication.translate("MainWindow", "Left", None, QtGui.QApplication.UnicodeUTF8))
        self.menuFile.setTitle(QtGui.QApplication.translate("MainWindow", "File", None, QtGui.QApplication.UnicodeUTF8))

    def button_handler(self):
        # Which button was pressed?

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    MainWindow = QtGui.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

我想在button_handler中确定按下了哪个按钮，例如按钮标题。

2 个答案:

答案 0 :(得分：1)

QButtonGroup专为此而设计。它适用于继承QAbstractButton的任何类型的按钮，例如QPushButton，QRadioButton，QCheckBox等。

只需使用addButton将所有按钮添加到按钮组，然后将buttonClicked信号连接到处理程序。

注意：将所有按钮放在容器小部件中可能是个好主意，例如QGroupBox，QFrame或只是普通QWidget。这将允许您循环容器的子项并自动将所有按钮添加到按钮组。

示例代码：

btngroup.py ：

from PyQt4 import QtGui, QtCore
from btngroup_ui import Ui_ButtonGroup

class Window(QtGui.QWidget, Ui_ButtonGroup):
    def __init__(self):
        QtGui.QWidget.__init__(self)
        self.setupUi(self)
        self.buttonGroup = QtGui.QButtonGroup(self)
        for button in self.buttonBox.findChildren(QtGui.QAbstractButton):
            self.buttonGroup.addButton(button)
        self.buttonGroup.buttonClicked.connect(self.handleButtonClicked)

    def handleButtonClicked(self, button):
        print('"%s" was clicked' % button.text())

if __name__ == '__main__':

    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

btngroup_ui.py ：

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'btngroup.ui'
#
# Created: Wed Nov 21 17:50:42 2012
#      by: PyQt4 UI code generator 4.9.5
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

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

class Ui_ButtonGroup(object):
    def setupUi(self, ButtonGroup):
        ButtonGroup.setObjectName(_fromUtf8("ButtonGroup"))
        ButtonGroup.resize(240, 167)
        self.horizontalLayout = QtGui.QHBoxLayout(ButtonGroup)
        self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
        self.buttonBox = QtGui.QWidget(ButtonGroup)
        self.buttonBox.setObjectName(_fromUtf8("buttonBox"))
        self.verticalLayout = QtGui.QVBoxLayout(self.buttonBox)
        self.verticalLayout.setMargin(0)
        self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
        self.buttonA = QtGui.QPushButton(self.buttonBox)
        self.buttonA.setObjectName(_fromUtf8("buttonA"))
        self.verticalLayout.addWidget(self.buttonA)
        self.buttonB = QtGui.QPushButton(self.buttonBox)
        self.buttonB.setObjectName(_fromUtf8("buttonB"))
        self.verticalLayout.addWidget(self.buttonB)
        self.buttonC = QtGui.QPushButton(self.buttonBox)
        self.buttonC.setObjectName(_fromUtf8("buttonC"))
        self.verticalLayout.addWidget(self.buttonC)
        self.buttonD = QtGui.QPushButton(self.buttonBox)
        self.buttonD.setObjectName(_fromUtf8("buttonD"))
        self.verticalLayout.addWidget(self.buttonD)
        self.horizontalLayout.addWidget(self.buttonBox)

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

    def retranslateUi(self, ButtonGroup):
        ButtonGroup.setWindowTitle(QtGui.QApplication.translate("ButtonGroup", "Button Group", None, QtGui.QApplication.UnicodeUTF8))
        self.buttonA.setText(QtGui.QApplication.translate("ButtonGroup", "Button A", None, QtGui.QApplication.UnicodeUTF8))
        self.buttonB.setText(QtGui.QApplication.translate("ButtonGroup", "Button B", None, QtGui.QApplication.UnicodeUTF8))
        self.buttonC.setText(QtGui.QApplication.translate("ButtonGroup", "Button C", None, QtGui.QApplication.UnicodeUTF8))
        self.buttonD.setText(QtGui.QApplication.translate("ButtonGroup", "Button D", None, QtGui.QApplication.UnicodeUTF8))

答案 1 :(得分：0)

您可能想要使用QtCore.QSignalMapper。

有关详细说明，请参阅http://srinikom.github.com/pyside-docs/PySide/QtCore/QSignalMapper.html。

基本上，它允许您将字符串值与按钮和插槽之间的每个连接相关联，因此您可以通过分析信号的字符串参数的内容来检查点击来自哪个按钮。

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