创建依赖window？

Question

我想创建一个相对于主要 window 自由浮动的辅助 window。但我也希望它在主 window 关闭时关闭。事实上，我希望应用程序在主 window 关闭时完全结束，并假设这是默认行为。

MRE:

from PyQt5.QtWidgets import QMainWindow, QApplication, QWidget, QLabel, QVBoxLayout
import sys

class MainWindow( QMainWindow ):
    def __init__( self ):
        super().__init__()
        
        self.secondary_window = SecondaryWindow()
        # self.secondary_window = SecondaryWindow( self )

class SecondaryWindow( QWidget ):
    def __init__( self, *args ):
        super().__init__( *args )
        layout = QVBoxLayout()
        self.label = QLabel( 'Another Window' )
        layout.addWidget(self.label )
        self.setLayout(layout)

app = QApplication([])
application = MainWindow()
application.move( 500, 500 )
application.show()

application.secondary_window.show()

sys.exit(app.exec())

如代码所示，关闭主要 window 不会关闭次要 window。

我认为可能使“主”window 成为次要 window 的父级可能会产生这种开箱即用的行为，但似乎不会：相反，次要 window 然后“合并”到主要 window.

这是完成特定任务的一种方法：

class MainWindow( QMainWindow ):
    ...
    def closeEvent( self, event ):
        super().closeEvent( event )
        QApplication.instance().exit()

...但这本身并不能解决如何使一个 window 依赖于另一个的问题。

也许您必须明确地对其进行硬编码？ IE。密切关注任何辅助 windows（例如在 list 中），然后在“主人”window 经历 closeEvent 时明确关闭它们 ... ?

Answer 1

flags Qt::WindowFlags

This enum type is used to specify various window-system properties for the widget. They are fairly unusual but necessary in a few cases. Some of these flags depend on whether the underlying window manager supports them.

Qt::Window
Indicates that the widget is a window, usually with a window system frame and a title bar, irrespective of whether the widget has a parent or not. Note that it is not possible to unset this flag if the widget does not have a parent.

https://doc.qt.io/qt-5/qt.html#WindowType-enum

import sys
from PyQt5.QtWidgets import QMainWindow, QApplication, QWidget, QLabel, QVBoxLayout
from PyQt5.QtCore import Qt


class SecondaryWindow( QWidget ):
    def __init__( self, parent):
        super(SecondaryWindow, self).__init__(parent, Qt.Window)       # <<<=== Qt.Window
        self.setWindowTitle("SecondaryWindow")
        layout = QVBoxLayout()
        self.label = QLabel( 'Another Window' )
        layout.addWidget(self.label )
        self.setLayout(layout)


class MainWindow( QMainWindow ):
    def __init__( self ):
        super().__init__()
        self.setWindowTitle("MainWindow")
        
#        self.secondary_window = SecondaryWindow()
        self.secondary_window = SecondaryWindow( self )                # self 
        self.secondary_window.show()

app = QApplication([])
application = MainWindow()
application.move( 500, 500 )
application.show()
#application.secondary_window.show()
sys.exit(app.exec_())

创建依赖window？

Create a dependent window?

python

pyqt5

qwidget

qmainwindow