如何捕获 PyQt5 QMainWindow 失去焦点

Question

我想要实现的目标：如果用户在 QMainWindow 之外单击，window 应该隐藏。

我是如何尝试解决这个问题的：找到一种方法来确定 QMainWindow 是否失去焦点，如果是，则使用后续函数隐藏 window。

不幸的是，我无法完全掌握如何实现这一目标。

可以使用标志 Qt::Popup 来完成，但是我无法向我的 QMainWindow 包含的小部件提供任何键盘输入。

Answer 1

void QApplication::focusChanged(QWidget *old, QWidget *now)

This signal is emitted when the widget that has keyboard focus changed from old to now, i.e., because the user pressed the tab-key, clicked into a widget or changed the active window. Both old and now can be the null-pointer.

import sys
from PyQt5 import QtCore, QtGui, QtWidgets


class MyWin(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        
        self.setFocus()
        QtWidgets.qApp.focusChanged.connect(self.on_focusChanged)       

    @QtCore.pyqtSlot("QWidget*", "QWidget*")
    def on_focusChanged(self, old, now):

        if now == None:
            print(f"\nwindow is the active window: {self.isActiveWindow()}")
            
            # window lost focus
            # do what you want
            
            self.setWindowState(QtCore.Qt.WindowMinimized)
            
        else: print(f"window is the active window: {self.isActiveWindow()}")
        

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = MyWin() 
    MainWindow.show()
    sys.exit(app.exec_())

如何捕获 PyQt5 QMainWindow 失去焦点

How to capture PyQt5 QMainWindow losing focus

python

focus

pyqt

python-3.x

pyqt5