Question

我需要拦截Spinbox按钮的升压和降压动作以启动一些代码来运行。但是，我相信我必须对抽象类进行子类化，但是我不确定如何正确地进行抽象。

我尚未尝试编写代码，无法通过谷歌搜索找到任何好的示例。我相信spinbox.py文件中的方向正确，但不确定我需要做什么。

spinboxui.py

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(200, 150)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        self.groupBox = QtWidgets.QGroupBox(self.centralwidget)
        self.groupBox.setObjectName("groupBox")
        self.gridLayout_2 = QtWidgets.QGridLayout(self.groupBox)
        self.gridLayout_2.setObjectName("gridLayout_2")
        self.spinBox = QtWidgets.QSpinBox(self.groupBox)
        self.spinBox.setObjectName("spinBox")
        self.gridLayout_2.addWidget(self.spinBox, 0, 0, 1, 1)
        self.label = QtWidgets.QLabel(self.groupBox)
        self.label.setText("")
        self.label.setObjectName("label")
        self.gridLayout_2.addWidget(self.label, 0, 1, 1, 1)
        self.gridLayout.addWidget(self.groupBox, 0, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)

spinbox.py

import sys
from spinboxui import Ui_MainWindow
from PyQt5 import QtCore, QtGui, QtWidgets

class Main(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super().__init__()
        self.setupUi(self)

    def do_something(self):
        pass


class QAbstractSpinBox(QtWidgets.QAbstractSpinBox):

    def __init__(self):
        QAbstractSpinBox.__init__(self)

    def stepUp(self):
        pass


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    spinbox = Main()
    spinbox.show()
    sys.exit(app.exec_())

我想拦截升压命令，运行一些代码，然后允许Spinbox执行。我将旋转框用作纯文本编辑字段的翻页程序，随着旋转框增加或减少，它会更改纯文本编辑器上的“页面”。我的代码需要在上一个页面上运行，然后再移动到下一个“页面”。

Answer 1

您不必：

从QAbstractSpinBox继承，因为使用与QSpinBox继承相同的名称创建一个类不会更改其行为
覆盖stepUp()方法，因为该方法仅由开发人员调用stepBy()方法，而您必须覆盖stepBy()方法并验证步骤是肯定的还是1如您所愿。

spinbox.py

from PyQt5 import QtWidgets


class SpinBox(QtWidgets.QSpinBox):
    def stepBy(self, steps):
        if steps > 0:
            print("execute function")
        super(SpinBox, self).stepBy(steps)

spinboxui.py

from PyQt5 import QtCore, QtGui, QtWidgets

from spinbox import SpinBox


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(200, 150)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        self.groupBox = QtWidgets.QGroupBox(self.centralwidget)
        self.groupBox.setObjectName("groupBox")
        self.gridLayout_2 = QtWidgets.QGridLayout(self.groupBox)
        self.gridLayout_2.setObjectName("gridLayout_2")
        self.spinBox = SpinBox(self.groupBox)
        self.spinBox.setObjectName("spinBox")
        self.gridLayout_2.addWidget(self.spinBox, 0, 0, 1, 1)
        self.label = QtWidgets.QLabel(self.groupBox)
        self.label.setText("")
        self.label.setObjectName("label")
        self.gridLayout_2.addWidget(self.label, 0, 1, 1, 1)
        self.gridLayout.addWidget(self.groupBox, 0, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)

main.py

import sys
from spinboxui import Ui_MainWindow
from PyQt5 import QtCore, QtGui, QtWidgets


class Main(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super().__init__()
        self.setupUi(self)


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    spinbox = Main()
    spinbox.show()
    sys.exit(app.exec_())

如果要执行main.py中的函数，最好创建一个信号：

spinbox.py

from PyQt5 import QtCore, QtWidgets


class SpinBox(QtWidgets.QSpinBox):
    upSignal = QtCore.pyqtSignal()

    def stepBy(self, steps):
        if steps > 0:
            self.upSignal.emit()
        super(SpinBox, self).stepBy(steps)

main.py

import sys
from spinboxui import Ui_MainWindow
from PyQt5 import QtCore, QtGui, QtWidgets


class Main(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super().__init__()
        self.setupUi(self)
        self.spinBox.upSignal.connect(self.on_up)

    @QtCore.pyqtSlot()
    def on_up(self):
        print("up")


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    spinbox = Main()
    spinbox.show()
    sys.exit(app.exec_())

子类抽象类

1 个答案: