我可以通过拉伸pyqt5窗口并保持原始宽高比（无布局）来调整其大小吗

Question

我制作了一个不使用布局的用户界面，但是当我制作全屏按钮时，按钮只是停留在左上角，并且看起来很小。

像素化对我来说并不重要，我只是想让事情变得更大。 （当分辨率为 1920x1080 时，这是正常的，但是当我们将其设为 4k 时，事情会变大 4 倍）

使用pyqt5可以拉伸所有窗口内容吗？

就像我在 mspaint 中制作的这个例子：

主要代码⬇️

from PyQt5.QtWidgets import QMainWindow, QApplication
import sys
from converted_ui import Ui_MainWindow

class MainUI(QMainWindow):
    def __init__(self):
        super(MainUI, self).__init__()

        # Initialize the user interface
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    ui = MainUI()
    ui.show()
    sys.exit(app.exec_())

converted_ui ⬇️

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(70, 80, 250, 250))
        self.pushButton.setObjectName("pushButton")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(465, 170, 106, 46))
        self.label.setObjectName("label")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 26))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))
        self.label.setText(_translate("MainWindow", "Lorem Ipsum"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

Answer 1

是的，您可以使用 resizeEvent() 方法 您可以更改小部件的大小和位置。

但这并不实用，最好使用布局管理器。

import sys
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QMainWindow, QApplication

#from converted_ui import Ui_MainWindow
class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
# ---------------------------------------------> vvvvvvvvvvvvvvvv <----  
#       self.pushButton.setGeometry(QtCore.QRect(70, 80, 250, 250))      
        self.pushButton.setGeometry(QtCore.QRect(80, 60, 200, 200))
        self.pushButton.setObjectName("pushButton")
        
        self.label = QtWidgets.QLabel(self.centralwidget)
# ----------------------------------------> vvvvvvvvvvvvvvvvv <----        
#       self.label.setGeometry(QtCore.QRect(465, 170, 106, 46))
        self.label.setGeometry(QtCore.QRect(460, 60, 200, 200))
        
        self.label.setObjectName("label")
        
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 26))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))
        self.label.setText(_translate("MainWindow", "Lorem Ipsum"))
        

class MainUI(QMainWindow, Ui_MainWindow):
    def __init__(self):
        super(MainUI, self).__init__()

        self.setupUi(self)
        
        self.label.setStyleSheet("background-color: #1E5F74; color: #47F5E1;")
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.w = 800
        self.h = 600
        self.x = 80
        self.y = 60
        self.setMinimumSize(self.w/3, self.h/3)
        self.widthFactor  = 1
        self.heightFactor = 1
        
    def resizeEvent(self, event):
        self.widthFactor  = self.rect().width() / 800
        self.heightFactor = self.rect().height()/ 600  
        w = self.w * 0.25 * self.widthFactor

        self.pushButton.resize(w, w)
        self.pushButton.move(self.x * self.widthFactor , self.y * self.heightFactor)
        
        self.label.resize(w, w)
        self.label.move((self.x * self.widthFactor + w * 2), self.y * self.heightFactor)

        super(MainUI, self).resizeEvent(event)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    ui = MainUI()
    ui.show()
    sys.exit(app.exec_())