PyQt5 - nextCheckState() method for Check Box
In PyQt5, the nextCheckState() method of the QCheckBox class is used to cycle through the available check states of a checkbox. This method can be handy if you want to programmatically change the state of the checkbox.
The QCheckBox can be in one of three states:
Qt.Unchecked: Checkbox is unchecked.Qt.PartiallyChecked: Checkbox is partially checked (often called the "indeterminate" state). This is typically used when the checkbox represents a group of options and not all of those options are selected.Qt.Checked: Checkbox is checked.
When you call the nextCheckState() method on a QCheckBox, it will change its state to the next one in the order mentioned above.
Here's a demonstration:
import sys from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QPushButton, QCheckBox from PyQt5.QtCore import Qt class CheckBoxDemo(QWidget): def __init__(self): super().__init__() self.init_ui() def init_ui(self): layout = QVBoxLayout() self.checkbox = QCheckBox("Check me", self) self.checkbox.setTristate(True) # Enables the PartiallyChecked state btn = QPushButton("Next State", self) btn.clicked.connect(self.on_click) layout.addWidget(self.checkbox) layout.addWidget(btn) self.setLayout(layout) def on_click(self): self.checkbox.nextCheckState() # Cycle to the next check state app = QApplication(sys.argv) window = CheckBoxDemo() window.show() app.exec_() In the above code, a QCheckBox and a QPushButton are added to a window. When the button is clicked, the on_click method is called, which then calls the nextCheckState() method on the checkbox, causing the checkbox to cycle through its available states.
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