整个屏幕上的鼠标释放事件

Question

我有一个pyqt小部件，启动时会在所有窗口上显示。我需要它保持关闭状态，直到用户决定为止。无论在哪里进行鼠标单击，每次执行鼠标单击事件时，都可能捕获到鼠标释放事件：在QtWidget窗口内部还是外部？

这里是我使用的样本：

class Release_check(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()


    def initUI(self):
        self.canvas = iface.mapCanvas()
        self.setWindowFlags(self.windowFlags() | QtCore.Qt.WindowStaysOnTopHint)
        self.grid = QGridLayout()
        self.grid.setSpacing(10)
        self.setGeometry(500, 500, 400, 100)

        self.text_out = QTextEdit()

        self.setLayout(self.grid)
        self.grid.addWidget(self.text_out, 0, 1, 1, 2)

        self.show()


    def mouseReleaseEvent(self, e):
        screen_coordinate = f"x:{e.x()}, y:{e.y()}"
        self.text_out.setText(screen_coordinate)
        super(Release_check, self).mouseReleaseEvent(e)


app = Release_check()

Answer 1

Qt仅检测窗口小部件内部的单击，如果要检测窗口小部件外部，则必须使用另一个使用OS资源来监视OS事件的库，例如pyinput：

import sys
from pynput import mouse
from PyQt5 import QtCore, QtGui, QtWidgets


class ButtonReleaseManager(QtCore.QObject):
    released = QtCore.pyqtSignal(int, int)

    def __init__(self, parent=None):
        super().__init__(parent)
        self._listener = mouse.Listener(on_click=self._handle_click)
        self._listener.start()

    def _handle_click(self, x, y, button, pressed):
        if not pressed:
            self.released.emit(x, y)


class Release_check(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
        self.manager = ButtonReleaseManager()
        self.manager.released.connect(self.show_position)

    def initUI(self):
        self.setWindowFlags(self.windowFlags() | QtCore.Qt.WindowStaysOnTopHint)
        self.setGeometry(500, 500, 400, 100)

        self.text_out = QtWidgets.QTextEdit()

        grid = QtWidgets.QGridLayout(self)
        grid.setSpacing(10)
        grid.addWidget(self.text_out, 0, 1, 1, 2)

    @QtCore.pyqtSlot(int, int)
    def show_position(self, x, y):
        screen_coordinate = f"x:{x}, y:{x}"
        self.text_out.setText(screen_coordinate)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    w = Release_check()
    w.show()
    sys.exit(app.exec_())