bentraje6381 | 2020-11-29 05:33:05 UTC | #1
Hi,
I'm trying to center a log-in form relative to window space but the setAlignment(QtCore.Qt.AlignCenter) is not working as expected.
You can check the code below so far:
python
import sys import os import json import PySide2 from PySide2 import QtCore from PySide2.QtCore import Qt, QTimer from PySide2.QtWidgets import QApplication, QMainWindow, QSpinBox, QWidget, QPushButton, QTextEdit, QVBoxLayout, QHBoxLayout, QLineEdit, QLabel, QStackedLayout from PySide2 import QtWidgets class MainWindow(QMainWindow): def __init__(self): super().__init__() self.setWindowTitle("Quiz Application") self.setFixedWidth(500) self.setFixedHeight(500) # LOG IN LAYOUT self.login_layout = QVBoxLayout() login_form_layout = QtWidgets.QFormLayout() self.username_edit = QtWidgets.QLineEdit() self.password_edit = QtWidgets.QLineEdit() self.username_edit.setFixedWidth(120) self.password_edit.setFixedWidth(120) login_form_layout.addRow(QtWidgets.QLabel("Username"), self.username_edit) login_form_layout.addRow(QtWidgets.QLabel("Password"), self.password_edit) self.login_btn = QPushButton("Log In") self.login_btn.setFixedWidth(120) self.login_btn.pressed.connect(self.login_cmd) login_form_layout.addWidget(self.login_btn) self.login_layout.addLayout(login_form_layout) self.login_layout.addStretch() self.login_widget = QWidget() self.login_widget.setLayout(self.login_layout) # Main Menu Layout self.main_menu_layout = QVBoxLayout() self.logout_btn = QPushButton("Log Out") self.logout_btn.setFixedWidth(120) self.logout_btn.pressed.connect(self.logout_cmd) self.main_menu_layout.addWidget(self.logout_btn) self.main_menu_layout.addStretch() self.main_menu_widget = QWidget() self.main_menu_widget.setLayout(self.main_menu_layout ) # Stack Layout self.stack_layout = QStackedLayout() self.stack_layout.addWidget(self.login_widget) self.stack_layout.addWidget(self.main_menu_widget) self.stack_layout.setCurrentIndex(0) self.stack_layout.setAlignment(QtCore.Qt.AlignCenter) widget = QWidget() widget.setLayout(self.stack_layout) self.setCentralWidget(widget) def login_cmd(self): self.stack_layout.setCurrentIndex(1) def logout_cmd(self): self.stack_layout.setCurrentIndex(0) app = QApplication(sys.argv) window = MainWindow() window.show() app.exec_() 
Salem_Bream | 2020-12-01 14:14:54 UTC | #2
@bentraje6381
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There are several issues we need to address.
- You are adding stretches!
.addStrech(), stretches will try to eat most of the layout available space and forces the widgets inside the layout to be shrunk. Just delete the.addStretch()statements. - you are setting the alignment of the
QStackedLayoutwhich shows only 1 widget at any given time!, so its alignment is meaningless. You need to set the alignment for the layouts of widgets themselves inside it. - the
QFormLayoutis a special case, not as other layouts, it has special option to specify the layout, read the documentation to know more. Useform_layout_xx.setFormAlignment().
Here is a working code...
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import sys import os import json import PySide2 from PySide2 import QtCore from PySide2.QtCore import Qt, QTimer from PySide2.QtWidgets import QApplication, QMainWindow, QSpinBox, QWidget, QPushButton, QTextEdit, QVBoxLayout, QHBoxLayout, QLineEdit, QLabel, QStackedLayout from PySide2 import QtWidgets class MainWindow(QMainWindow): def __init__(self): super().__init__() self.setWindowTitle("Quiz Application") self.setFixedWidth(500) self.setFixedHeight(500) # LOG IN LAYOUT self.login_layout = QVBoxLayout() login_form_layout = QtWidgets.QFormLayout() self.username_edit = QtWidgets.QLineEdit() self.password_edit = QtWidgets.QLineEdit() self.username_edit.setFixedWidth(120) self.password_edit.setFixedWidth(120) login_form_layout.addRow(QtWidgets.QLabel( "Username"), self.username_edit) login_form_layout.addRow(QtWidgets.QLabel( "Password"), self.password_edit) self.login_btn = QPushButton("Log In") self.login_btn.setFixedWidth(120) self.login_btn.pressed.connect(self.login_cmd) login_form_layout.addWidget(self.login_btn) self.login_layout.addLayout(login_form_layout) login_form_layout.setFormAlignment(Qt.AlignCenter) self.login_widget = QWidget() self.login_widget.setLayout(self.login_layout) # Main Menu Layout self.main_menu_layout = QVBoxLayout() self.logout_btn = QPushButton("Log Out") self.logout_btn.setFixedWidth(120) self.logout_btn.pressed.connect(self.logout_cmd) self.main_menu_layout.addWidget(self.logout_btn) self.main_menu_layout.setAlignment(QtCore.Qt.AlignCenter) self.main_menu_widget = QWidget() self.main_menu_widget.setLayout(self.main_menu_layout) # Stack Layout self.stack_layout = QStackedLayout() self.stack_layout.addWidget(self.login_widget) self.stack_layout.addWidget(self.main_menu_widget) self.stack_layout.setCurrentIndex(0) widget = QWidget() widget.setLayout(self.stack_layout) self.setCentralWidget(widget) def login_cmd(self): self.stack_layout.setCurrentIndex(1) def logout_cmd(self): self.stack_layout.setCurrentIndex(0) app = QApplication(sys.argv) window = MainWindow() window.show() app.exec_() bentraje6381 | 2020-12-01 14:16:25 UTC | #3
Thanks for the explaining what I did wrong. The code work as expected.
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