Agfdhyk

I'm making a program to specify a specific area using pyqt5.
If I click on the capture button, I will hide the MainWindow and display a screen to specify the area. I want to clear the screen and return to the mainwindow by pressing the esc key. But MainWindow does not show again. How should I work it?

form_class = uic.loadUiType("prototype.ui")[0]

class MainWindow(QtWidgets.QMainWindow, form_class) :

    def __init__(self):

        super().__init__()

        self.setupUi(self)



        self.Capture_Button.clicked.connect(self.Capture_Btn_clicked)

        self.CaptureWindow = CaptureWidget()

        self.CaptureWindow.hide()



    def Capture_Btn_clicked(self) :

        self.hide()

        self.CaptureWindow.close()

        self.CaptureWindow.__init__()

        self.CaptureWindow.show()

        QtWidgets.QApplication.setOverrideCursor(QtGui.QCursor(QtCore.Qt.CrossCursor)) 



    def enterEvent(self, QEvent):

         QtWidgets.QApplication.setOverrideCursor(QtGui.QCursor(QtCore.Qt.ArrowCursor)) 

         self.setWindowOpacity(1)

This is the class that specifies the area (some of the code is omitted).

class CaptureWidget(QtWidgets.QDialog):



    def __init__(self):

        super().__init__()

        root = tk.Tk()

        self.setupUi(self)



    def setupUi(self) :

        self.screen_width = root.winfo_screenwidth()

        self.screen_height = root.winfo_screenheight()

        self.setGeometry(0, 0, self.screen_width, self.screen_height)

        self.setWindowTitle(' ')

        self.begin = QtCore.QPoint()  

        self.end = QtCore.QPoint()

        self.setWindowOpacity(0.3) 

        QtWidgets.QApplication.setOverrideCursor(QtGui.QCursor(QtCore.Qt.CrossCursor)) 

        self.setWindowFlags(QtCore.Qt.FramelessWindowHint|QtCore.Qt.WindowStaysOnTopHint) 

        print('Capture the screen...')



        self.is_set_region = False 

        self.is_mouse_click = False

        self.show()    



    def keyPressEvent(self, event):

        key = event.key()

        if key == Qt.Key_Escape:



            print('esc')

            self.close()



        elif key == Qt.Key_F1:

            self.close()

            self.__init__()

First of all, instead of overwriting the keyPressEvent method, it is easier to use QShortcut. On the other hand for this case it is better to create a signal that indicates when the escape key is pressed connecting it to the show method.

from PyQt5 import QtCore, QtGui, QtWidgets, uic



class CaptureWidget(QtWidgets.QDialog):

    escape_pressed = QtCore.pyqtSignal()



    def __init__(self):

        super().__init__()

        self.setupUi()



    def setupUi(self):

        self.setWindowOpacity(0.3) 

        QtWidgets.QApplication.setOverrideCursor(QtGui.QCursor(QtCore.Qt.CrossCursor)) 

        self.setWindowFlags(QtCore.Qt.FramelessWindowHint | QtCore.Qt.WindowStaysOnTopHint)

        shorcut_scaped = QtWidgets.QShortcut(QtCore.Qt.Key_Escape, self)

        shorcut_scaped.activated.connect(self.escape_pressed)

        shorcut_scaped.activated.connect(self.close)



        shorcut = QtWidgets.QShortcut(QtCore.Qt.Key_F1, self)

        shorcut.activated.connect(self.close)



form_class, _ = uic.loadUiType("prototype.ui")



class MainWindow(QtWidgets.QMainWindow, form_class):

    def __init__(self):

        super().__init__()

        self.setupUi(self)

        self.Capture_Button.clicked.connect(self.Capture_Btn_clicked)

        self.CaptureWindow = CaptureWidget()

        self.CaptureWindow.escape_pressed.connect(self.show)



    @QtCore.pyqtSlot()

    def Capture_Btn_clicked(self):

        self.hide()

        self.CaptureWindow.showFullScreen()

        QtWidgets.QApplication.setOverrideCursor(QtGui.QCursor(QtCore.Qt.CrossCursor)) 



    def enterEvent(self, QEvent):

         QtWidgets.QApplication.setOverrideCursor(QtGui.QCursor(QtCore.Qt.ArrowCursor)) 

         self.setWindowOpacity(1)



if __name__ == '__main__':

    import sys

    app = QtWidgets.QApplication(sys.argv)

    w = MainWindow()

    w.show()

    sys.exit(app.exec_())