如何设置主窗口的大小策略？

from PyQt5 import QtCore, QtGui, QtWidgets class Ui_CompanyCommanderLogin(object): def setupUi(self, CompanyCommanderLogin): CompanyCommanderLogin.setObjectName("CompanyCommanderLogin") CompanyCommanderLogin.resize(252, 227) sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Expanding) sizePolicy.setHorizontalStretch(0) sizePolicy.setVerticalStretch(0) sizePolicy.setHeightForWidth(CompanyCommanderLogin.sizePolicy().hasHeightForWidth()) CompanyCommanderLogin.setSizePolicy(sizePolicy) self.centralwidget = QtWidgets.QWidget(CompanyCommanderLogin) self.centralwidget.setObjectName("centralwidget") self.groupBox = QtWidgets.QGroupBox(self.centralwidget) self.groupBox.setGeometry(QtCore.QRect(10, 10, 231, 171)) self.groupBox.setObjectName("groupBox") self.label = QtWidgets.QLabel(self.groupBox) self.label.setGeometry(QtCore.QRect(20, 40, 71, 16)) self.label.setObjectName("label") self.label_3 = QtWidgets.QLabel(self.groupBox) self.label_3.setGeometry(QtCore.QRect(20, 70, 41, 16)) self.label_3.setObjectName("label_3") self.label_4 = QtWidgets.QLabel(self.groupBox) self.label_4.setGeometry(QtCore.QRect(20, 100, 41, 16)) self.label_4.setObjectName("label_4") self.lineEdit_x_location = QtWidgets.QLineEdit(self.groupBox) self.lineEdit_x_location.setGeometry(QtCore.QRect(100, 70, 51, 20)) self.lineEdit_x_location.setObjectName("lineEdit_x_location") self.lineEdit_y_location = QtWidgets.QLineEdit(self.groupBox) self.lineEdit_y_location.setGeometry(QtCore.QRect(100, 100, 51, 20)) self.lineEdit_y_location.setObjectName("lineEdit_y_location") self.pushButton_login = QtWidgets.QPushButton(self.groupBox) self.pushButton_login.setGeometry(QtCore.QRect(140, 140, 71, 21)) self.pushButton_login.setStyleSheet("background-color: rgb(0, 209, 255);\n" "color: rgb(255, 255, 255);\n" "background-color: rgb(0, 0, 127);") self.pushButton_login.setObjectName("pushButton_login") self.comboBox = QtWidgets.QComboBox(self.groupBox) self.comboBox.setGeometry(QtCore.QRect(100, 40, 51, 21)) self.comboBox.setObjectName("comboBox") CompanyCommanderLogin.setCentralWidget(self.centralwidget) self.menubar = QtWidgets.QMenuBar(CompanyCommanderLogin) self.menubar.setGeometry(QtCore.QRect(0, 0, 252, 18)) self.menubar.setObjectName("menubar") CompanyCommanderLogin.setMenuBar(self.menubar) self.statusbar = QtWidgets.QStatusBar(CompanyCommanderLogin) self.statusbar.setObjectName("statusbar") CompanyCommanderLogin.setStatusBar(self.statusbar) self.retranslateUi(CompanyCommanderLogin) QtCore.QMetaObject.connectSlotsByName(CompanyCommanderLogin) def retranslateUi(self, CompanyCommanderLogin): _translate = QtCore.QCoreApplication.translate CompanyCommanderLogin.setWindowTitle(_translate("CompanyCommanderLogin", "Company Commander Login")) self.groupBox.setTitle(_translate("CompanyCommanderLogin", "Login")) self.label.setText(_translate("CompanyCommanderLogin", "<html><head/><body>Company Number:</body></html>")) self.label_3.setText(_translate("CompanyCommanderLogin", "<html><head/><body>X Location:</body></html>")) self.label_4.setText(_translate("CompanyCommanderLogin", "<html><head/><body>Y Location:</body></html>")) self.pushButton_login.setText(_translate("CompanyCommanderLogin", "Login")) if __name__ == "__main__": import sys QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling) app = QtWidgets.QApplication(sys.argv) CompanyCommanderLogin = QtWidgets.QMainWindow() ui = Ui_CompanyCommanderLogin() ui.setupUi(CompanyCommanderLogin) CompanyCommanderLogin.show() sys.exit(app.exec_())

1条回答

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1楼 · 发布于 2024-09-30 01:32:32

正如the docs指出的：

The size policy of a widget is an expression of its willingness to be resized in various ways, and affects how the widget is treated by the layout engine. Each widget returns a QSizePolicy that describes the horizontal and vertical resizing policy it prefers when being laid out. You can change this for a specific widget by changing its QWidget::sizePolicy property.

QSizePolicy只在布局中工作，在您的情况下没有。你知道吗

因此，解决方案是使用QXLayout创建您的设计，如果您想在Qt设计器中使用它，您应该阅读Qt Designer Manual，尤其是Using Layouts in Qt Designer部分。你知道吗

在本例中，由于您没有提供允许我使用Qt Designer的.ui，我将从零开始快速提供解决方案

from PyQt5 import QtCore, QtGui, QtWidgets


class CompanyCommanderLogin(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.groupbox = QtWidgets.QGroupBox(self.tr("Login"))
        self.company_cb = QtWidgets.QComboBox()
        sp = self.company_cb.sizePolicy()
        sp.setHorizontalPolicy(QtWidgets.QSizePolicy.Expanding)
        self.company_cb.setSizePolicy(sp)
        self.xlocation_le = QtWidgets.QLineEdit()
        self.ylocation_le = QtWidgets.QLineEdit()
        self.login_button = QtWidgets.QPushButton(self.tr("Login"))
        self.login_button.setStyleSheet(
            "background-color: rgb(0, 209, 255);\n"
            "color: rgb(255, 255, 255);\n"
            "background-color: rgb(0, 0, 127);"
        )

        font = self.font()
        font.setPointSize(9)
        self.setFont(font)

        central_widget = QtWidgets.QWidget()
        self.setCentralWidget(central_widget)
        lay = QtWidgets.QVBoxLayout(central_widget)
        lay.addWidget(self.groupbox)

        flay = QtWidgets.QFormLayout()

        flay.addRow(
            self.tr("Company Number:"), self.company_cb,
        )
        flay.addRow(
            self.tr("X Location:"), self.xlocation_le,
        )
        flay.addRow(
            self.tr("Y Location:"), self.ylocation_le,
        )

        lay = QtWidgets.QVBoxLayout()
        lay.addLayout(flay)
        lay.addWidget(self.login_button, alignment=QtCore.Qt.AlignHCenter)
        lay.addStretch()
        self.groupbox.setLayout(lay)


if __name__ == "__main__":
    import sys

    if hasattr(QtCore.Qt, "AA_EnableHighDpiScaling"):
        QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)

    app = QtWidgets.QApplication(sys.argv)
    w = CompanyCommanderLogin()
    w.show()
    sys.exit(app.exec_())

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