Question

我正在寻找一种在主窗口的中心位置打开QDialog widget的方法。我已将主窗口的位置设置为居中。

 centerPoint = qtw.QDesktopWidget().availableGeometry().center()
        qtRectangle.moveCenter(centerPoint)

将对话框小部件置于主窗口的位置我已将其设置为

msgb.move(self.pos().x(), self.pos().y())

对话框窗口位于主窗口的正后方，但在主窗口的左上方打开，如何将其位置更改为主窗口的中心？

#!/usr/bin/env python

"""
startscreen

base window remit to specific tests

"""

import os
import sys
from PyQt5 import QtWidgets as qtw
from PyQt5 import QtCore as qtc




class Startscreen(qtw.QWidget):
    '''
    remit to one of three tests if widgets toggled/clicked
    hide its self after
    '''

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # your code will go here

        # interface

        # position
        qtRectangle = self.frameGeometry()
        centerPoint = qtw.QDesktopWidget().availableGeometry().center()
        qtRectangle.moveCenter(centerPoint)
        self.move(qtRectangle.topLeft())
        # size
        self.resize(700, 410)
        # frame title
        self.setWindowTitle("Lambda")

        # heading
        heading_label = qtw.QLabel("Lambda Version 1.0")
        heading_label.setAlignment(qtc.Qt.AlignHCenter)

        # active user
        activeuser_label = qtw.QLabel('Benutzer: ' + os.getlogin())
        activeuser_label.setStyleSheet("background-color: rgb(234, 246, 22)")
        activeuser_label.setAlignment(qtc.Qt.AlignRight | qtc.Qt.AlignTop)

        # groubox for widget positioning
        self.groupbox = qtw.QGroupBox(self)
        # groupbox.setAlignment(qtc.Qt.AlignHCenter)

        # layout and widgets
        vlayout = qtw.QVBoxLayout()
        vlayout.setAlignment(qtc.Qt.AlignHCenter)

        self.particlesize_radiobutton = qtw.QRadioButton("test1")
        vlayout.addWidget(self.particlesize_radiobutton)
        self.dimensionalchange_radiobutton = qtw.QRadioButton("test2")
        vlayout.addWidget(self.dimensionalchange_radiobutton)
        self.dimensionalchangecook_radiobutton = qtw.QRadioButton("test3")
        vlayout.addWidget(self.dimensionalchangecook_radiobutton)
        self.select_button = qtw.QPushButton('select')
        vlayout.addWidget(self.select_button)

        self.groupbox.setLayout(vlayout)

        # mainlayout
        main_layout = qtw.QFormLayout()
        main_layout.addRow(activeuser_label)
        main_layout.addRow(heading_label)
        main_layout.setVerticalSpacing(40)
        main_layout.addRow(self.groupbox)

        self.setLayout(main_layout)

        # functionality
        self.select_button.clicked.connect(self.open_box)


        self.show()


    def open_box(self):
        msgb = qtw.QMessageBox()
        msgb.setWindowTitle("title")
        msgb.setText("hier sthet was")
        msgb.move(self.pos().x(), self.pos().y())
        run = msgb.exec_()

        # msgb = qtw.QMessageBox()
        # msgb.addButton()
        # if x open new windwo
        #



if __name__ == '__main__':
    app = qtw.QApplication(sys.argv)
    w = Startscreen()
    sys.exit(app.exec_())

Answer 1

小部件具有相对于其父级的位置，如果它没有父级，则它将相对于屏幕。在msgb的情况下，它属于第二种情况，因此您必须将窗口中心的坐标转换为全局坐标（也就是说，相对于屏幕）。即使执行上述操作，它也不会居中，因为该位置是相对于左上角的，即msgb topleft将位于屏幕的中央，这是不希望的，因此您还必须考虑msgb的大小。而且显示前后的msgb大小是不同的，因此使用QTimer就足够了：

def open_box(self):
    msgb = qtw.QMessageBox()
    msgb.setWindowTitle("title")
    msgb.setText("hier sthet was")
    qtc.QTimer.singleShot(
        0,
        lambda: msgb.move(
            self.mapToGlobal(self.rect().center() - msgb.rect().center())
        ),
    )
    run = msgb.exec_()

如何在主窗口的中心位置打开QDialog小部件

1 个答案: