PyQt5 从在开环中创建的多个按钮中检索 ID 和值

Question

我正在尝试基于条目 (QLineEdit) 创建按钮 (QPushButtons)。我的想法是，我希望用户能够根据需要创建尽可能多的按钮，只需在输入框中添加新文本，然后按“添加标签”（见下图）即可。

虽然我能够做到这一点，但我现在无法检索每个按钮的标签值，因为我使用的过程会删除所有以前的值（我只能检索最后输入的值） .我希望能够在单击每个按钮时打印每个特定的标签值。

我的代码如下：

from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton, QLineEdit
import sys

    class MyWindow(QMainWindow):
        def __init__(self):
            super(MyWindow, self).__init__()
            self.setGeometry(100, 100, 1500, 1500)
            self.setWindowTitle("My Program")
            self.labelButtons = []  # List of all the buttons displaying labels
            self.eraseButtons = []  # List of all the buttons displaying "X"
            self.Yposition = 50
            self.initUI()

        def initUI(self):
            self.labelEntry = QLineEdit(self)
            self.labelEntry.move(50, self.Yposition)
            self.labelEntry.resize(300, 40)

            self.addLabelButton = QPushButton(self)
            self.addLabelButton.setText("Add Label")
            self.addLabelButton.move(400, self.Yposition)
            self.addLabelButton.resize(300, 40)
            self.addLabelButton.clicked.connect(self.addNewLabel)

        def addNewLabel(self):
            self.Yposition += 50
            self.newLabelName = self.labelEntry.text()
            self.labelButtons.append(self.createButtonLabel(self.newLabelName))
            self.eraseButtons.append(self.eraseButtonLabel())
            self.updatelabels()

        def createButtonLabel(self, labelname):
            self.button = QPushButton(self)
            self.button.setText(str(labelname))
            self.button.resize(300, 40)
            self.button.move(50, self.Yposition)
            self.button.clicked.connect(self.printbutton)
            return self.button

        def eraseButtonLabel(self):
            self.buttonErase = QPushButton(self)
            self.buttonErase.setText("X")
            self.buttonErase.resize(40, 40)
            self.buttonErase.move(360, self.Yposition)
            self.buttonErase.clicked.connect(self.printbutton)
            return self.buttonErase

        def updatelabels(self):
            for button in self.labelButtons:
                button.show()
            for button in self.eraseButtons:
                button.show()

        def printbutton(self):
            print(self.button.text())


    if __name__ == '__main__':
        app = QApplication(sys.argv)
        win = MyWindow()
        win.show()
        sys.exit(app.exec_())

<!-- end snippet -->

Answer 1

使用 Google pyqt clicked event 我发现你必须使用

def printbutton(self):
    widget = self.sender()
    print(widget.text())

ZetCode: Events and signals in PyQt5

编辑：

至于 erease 按钮 - 您应该从 createButtonLabel 获取按钮并将其发送到 eraseButtonLabel

    labelbutton = self.createButtonLabel(self.newLabelName)
    erasebutton = self.eraseButtonLabel(labelbutton)

并且您可以使用 lambda 来使用参数

赋值函数

def eraseButtonLabel(self, labelbutton):
    # ... code ...
    self.buttonErase.clicked.connect(lambda: self.erasebutton(labelbutton))

函数应该得到这个参数

def erasebutton(self, button):
    widget = self.sender()
    print('clicked:', widget.text())
    print('  erase:', button.text())

或者你可以在 buttonErase

中将 button 赋给 own 变量

def eraseButtonLabel(self, labelbutton):
    # ... code ...
    self.buttonErase.assigned_button = labelbutton
    self.buttonErase.clicked.connect(self.erasebutton)

并在函数中使用它

def erasebutton(self):
    widget = self.sender()
    print('clicked:', widget.text())
    print('  erase:', widget.assigned_button.text())

同时使用两种方法的完整代码，但您只需要一种方法。

from PyQt5.QtWidgets import *
import sys

class MyWindow(QMainWindow):
    def __init__(self):
        super(MyWindow, self).__init__()
        self.setGeometry(100, 100, 1500, 1500)
        self.setWindowTitle("My Program")
        self.labelButtons = []  # List of all the buttons displaying labels
        self.eraseButtons = []  # List of all the buttons displaying "X"
        self.Yposition = 50
        self.initUI()

    def initUI(self):
        self.labelEntry = QLineEdit(self)
        self.labelEntry.move(50, self.Yposition)
        self.labelEntry.resize(300, 40)

        self.addLabelButton = QPushButton(self)
        self.addLabelButton.setText("Add Label")
        self.addLabelButton.move(400, self.Yposition)
        self.addLabelButton.resize(300, 40)
        self.addLabelButton.clicked.connect(self.addNewLabel)

    def addNewLabel(self):
        self.Yposition += 50
        self.newLabelName = self.labelEntry.text()
        
        labelbutton = self.createButtonLabel(self.newLabelName)
        erasebutton = self.eraseButtonLabel(labelbutton)
        
        self.labelButtons.append(labelbutton)
        self.eraseButtons.append(erasebutton)
        self.updatelabels()

    def createButtonLabel(self, labelname):
        self.button = QPushButton(self)
        self.button.setText(str(labelname))
        self.button.resize(300, 40)
        self.button.move(50, self.Yposition)
        self.button.clicked.connect(self.printbutton)
        return self.button

    def eraseButtonLabel(self, labelbutton):
        self.buttonErase = QPushButton(self)
        self.buttonErase.setText("X")
        self.buttonErase.resize(40, 40)
        self.buttonErase.move(360, self.Yposition)
        self.buttonErase.assigned_button = labelbutton
        self.buttonErase.clicked.connect(lambda: self.erasebutton(labelbutton))
        #self.buttonErase.clicked.connect(self.erasebutton)
        return self.buttonErase    

    def updatelabels(self):
        for button in self.labelButtons:
            button.show()
        for button in self.eraseButtons:
            button.show()

    def printbutton(self):
        print('clicked:', self.sender().text())

    def erasebutton(self, button):
        widget = self.sender()
        print('clicked:', widget.text())
        print('  erase:', button.text())
        print('  erase:', widget.assigned_button.text())

if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = MyWindow()
    win.show()
    sys.exit(app.exec_())

编辑：

另一种方法是创建自己的小部件，它有两个按钮 labelbutton 和 erasebutton 然后 erasebutton 只能直接访问自己的 labelbutton.

顺便说一句：出于类似的原因，我会将按钮成对放置

 self.buttons.append([labelbutton, erasebutton])

而不是分隔列表

 self.labelButtons.append(labelbutton)
 self.eraseButtons.append(erasebutton)

我创建自己的小部件的示例。

from PyQt5.QtWidgets import *
import sys

class MyWidget(QWidget):
    def __init__(self, parent, labelname, *args, **kwargs):
        super().__init__(parent, *args, **kwargs)

        self.resize(350, 40)
        
        self.labelButton = QPushButton(self)
        self.labelButton.setText(str(labelname))
        self.labelButton.resize(300, 40)
        self.labelButton.move(0, 0)
        self.labelButton.clicked.connect(self.printbutton)

        self.buttonErase = QPushButton(self)
        self.buttonErase.setText("X")
        self.buttonErase.resize(40, 40)
        self.buttonErase.move(310, 0)
        self.buttonErase.clicked.connect(self.erasebutton)

        self.show()

    def printbutton(self):
        print('clicked:', self.labelButton.text())

    def erasebutton(self):
        print('clicked:', self.buttonErase.text())
        print('  erase:', self.labelButton.text())


class MyWindow(QMainWindow):
    def __init__(self):
        super(MyWindow, self).__init__()
        self.setGeometry(100, 100, 1500, 1500)
        self.setWindowTitle("My Program")
        self.widgets = []
        self.Yposition = 50
        self.initUI()

    def initUI(self):
        self.labelEntry = QLineEdit(self)
        self.labelEntry.move(50, self.Yposition)
        self.labelEntry.resize(300, 40)

        self.addLabelButton = QPushButton(self)
        self.addLabelButton.setText("Add Label")
        self.addLabelButton.move(400, self.Yposition)
        self.addLabelButton.resize(300, 40)
        self.addLabelButton.clicked.connect(self.addNewLabel)

    def addNewLabel(self):
        self.Yposition += 50
        text = self.labelEntry.text()
                
        widget = MyWidget(self, text)
        widget.move(50, self.Yposition)
        
        self.widgets.append(widget)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = MyWindow()
    win.show()
    sys.exit(app.exec_())

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