Question

我试图在单击按钮时显示一组操作，如果单击另一个按钮则显示其他选项集。以下是代码：

  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_())

单击按钮时，我可以看到值已更新，但未在主布局中更新。我该如何动态更新小部件？如果我需要根据动态值添加小部件，我该怎么做呢？我错过了信号和插槽吗？如果我错了，请纠正我。感谢

Answer 1

你的代码几乎就在那里。您看到的问题是小部件正在添加但从未删除。以下代码可以简化，但我试着让它靠近你的代码，这样你就可以更容易地看到变化。

现在主要的变化是有一个类成员screen_layout，并且在actions()内添加/删除了小部件。

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_())

Pyqt5更新虽然更新了小部件，但Widget未添加到布局中

1 个答案: