I want do dynamically change the layout in Qt. For example, I want to change the QHBoxLayout
to QVBoxLayout
through a button. My test code is:
from PyQt5.QtWidgets import *
import sys
class SubWidget(QWidget):
def __init__(self):
super().__init__()
self.lay = QHBoxLayout()
self.label1 = QLabel('left')
self.label2 = QLabel('right')
self.lay.addWidget(self.label1)
self.lay.addWidget(self.label2)
self.setLayout(self.lay)
def change(self):
self.lay.removeWidget(self.label1)
self.lay.removeWidget(self.label2)
self.lay = QVBoxLayout()
self.setLayout(self.lay)
self.lay.addWidget(self.label2)
self.lay.addWidget(self.label1)
class Widget(QWidget):
def __init__(self):
super().__init__()
lay = QVBoxLayout()
self.btn = QPushButton('change layout')
self.btn.clicked.connect(self.btnClick)
self.subWidget = SubWidget()
lay.addWidget(self.btn)
lay.addWidget(self.subWidget)
self.setLayout(lay)
def btnClick(self, check=False):
self.subWidget.change()
if __name__ == '__main__':
app = QApplication(sys.argv)
win = Widget()
win.show()
app.exec_()
The code output GUI is:
And I hope it change to the following picture after click change layout
button:
Any suggestion is appreciated~~~
CodePudding user response:
The point of the solution is
- Make sure old layout is deleted, included both python wrapping reference and core Qt object, that's for
deleteLater()
is used. - Make sure new layout is assigned strictly after old was deleted, that's for need to use
destroyed()-switchlayout()
signal-slot chain.
I reproduced example with PySide6 (don't forget to switch on your version of PyQt or PySide package):
# from PyQt5.QtWidgets import *
from PySide6.QtWidgets import *
import sys
class SubWidget(QWidget):
def __init__(self):
super().__init__()
self.lay = QVBoxLayout()
self.label1 = QLabel('left')
self.label2 = QLabel('right')
self.lay.addWidget(self.label1)
self.lay.addWidget(self.label2)
self.setLayout(self.lay)
def change(self):
self.lay.removeWidget(self.label1)
self.lay.removeWidget(self.label2)
self.lay.deleteLater()
self.lay.destroyed.connect(self.switchlayout)
def switchlayout(self):
# print("***destroyed")
self.lay = QHBoxLayout()
self.lay.addWidget(self.label2)
self.lay.addWidget(self.label1)
self.setLayout(self.lay)
self.adjustSize()
class Widget(QWidget):
def __init__(self):
super().__init__()
lay = QVBoxLayout()
self.btn = QPushButton('change layout')
self.btn.clicked.connect(self.btnClick)
self.subWidget = SubWidget()
lay.addWidget(self.btn)
lay.addWidget(self.subWidget)
self.setLayout(lay)
def btnClick(self, check=False):
self.subWidget.change()
if __name__ == '__main__':
app = QApplication(sys.argv)
win = Widget()
win.show()
app.exec_()