尽管更新了Pyqt5，但未将Pyqt5更新的窗口小部件添加到布局中

Question

I am trying to show set of actions when a button is clicked and other set of options if another button is clicked. Below is the code:

  class Screen(QWidget):
    def __init__(self):
        super(Screen, self).__init__()
        layout = QHBoxLayout(self)
        self.all_running()
        layout.addWidget(self.running_full_widget)
        self.actions('1')
        layout.addWidget(self.actions_full_widget)
        self.setLayout(layout)
        self.show()
    def all_running(self):
        self.running_full_widget = QWidget()
        runnning_full_layout= QVBoxLayout()
        button1 = QPushButton("btn1")
        button2 = QPushButton("btn2")
        button1.clicked.connect(lambda: self.actions('2'))
        button2.clicked.connect(lambda: self.actions('3'))
        runnning_full_layout.addWidget(button1)
        runnning_full_layout.addWidget(button2)
        self.running_full_widget.setLayout(runnning_full_layout)
    def actions(self,value):
        self.actions_full_widget= QWidget()
        val = int(value)
        print(val)
        actions_layout = QVBoxLayout()
        for i in range(val):
           actions_item = QLabel(str(i))
           actions_layout.addWidget(actions_item)
        self.actions_full_widget.setLayout(actions_layout)

app = QApplication(sys.argv)
Gui = Screen()
sys.exit(app.exec_())

When button is clicked i can see the value is updated but it is not updated in the main layout. how can i dynamically update the widgets ? How can I do that in cases where i need to add widgets based on a dynamic value. did i miss anything with signals and slots? Kindly correct me if i am wrong. Thanks

Answer 1

Your code was almost there. The problem you are seeing is the widgets were being added but never removed. The following code could be simplified, but I tried to keep it close to yours so you could see the changes more easily.

The main change is now there is a class member screen_layout and the widgets are added/removed from it inside actions() .

import sys
from PyQt5.QtWidgets import QHBoxLayout, QVBoxLayout, QWidget, QPushButton, QLabel, QApplication

class Screen(QWidget):
    def __init__(self):
        super(Screen, self).__init__()
        layout = QHBoxLayout(self)
        self.screen_layout = layout
        self.all_running()
        layout.addWidget(self.running_full_widget)
        self.actions_full_widget = None
        self.actions('1')
        # layout.addWidget(self.actions_full_widget)
        self.setLayout(layout)
        self.show()
    def all_running(self):
        self.running_full_widget = QWidget()
        runnning_full_layout= QVBoxLayout()
        button1 = QPushButton("btn1")
        button2 = QPushButton("btn2")
        button1.clicked.connect(lambda: self.actions('2'))
        button2.clicked.connect(lambda: self.actions('3'))
        runnning_full_layout.addWidget(button1)
        runnning_full_layout.addWidget(button2)
        self.running_full_widget.setLayout(runnning_full_layout)
    def actions(self,value):
        # Remove any previously added widget
        if self.actions_full_widget is not None:
            self.screen_layout.removeWidget(self.actions_full_widget)
            self.actions_full_widget.deleteLater()
        self.actions_full_widget= QWidget()
        val = int(value)
        print(val)
        actions_layout = QVBoxLayout()
        for i in range(val):
           actions_item = QLabel(str(i))
           actions_layout.addWidget(actions_item)
        self.actions_full_widget.setLayout(actions_layout)
        self.screen_layout.addWidget(self.actions_full_widget)

app = QApplication(sys.argv)
Gui = Screen()
sys.exit(app.exec_())