How can the idea be implemented to display windows in overlay mode?

1 year ago
Sophia Anderson
2 minutes

To achieve window overlay display, follow these steps:

  1. Create a main window (referred to as Window A).
  2. Create a subwindow (called Window B) and set it as a child window of Window A.
  3. Position and resize window B so that it covers a portion of window A.
  4. Set the properties of window B to have a transparent background so that the content of window A can be displayed on the blank area of window B.
  5. Set window B to be visible so it appears on top of window A.

The specific implementation code may vary depending on the programming language and window library. Here is an example using Python and PyQt5, demonstrating how to achieve window overlay display.

import sys
from PyQt5.QtWidgets import QApplication, QWidget

class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        
        self.setGeometry(100, 100, 500, 500)
        self.setWindowTitle('Main Window')
        
        self.overlayWindow = OverlayWindow(self)
        self.overlayWindow.setGeometry(200, 200, 200, 200)
        self.overlayWindow.show()

class OverlayWindow(QWidget):
    def __init__(self, parent):
        super().__init__(parent, flags = Qt.Window | Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint)
        
        self.setAttribute(Qt.WA_TranslucentBackground)
        
        self.setStyleSheet('background-color: transparent;')
        self.setWindowOpacity(0.5)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    mainWindow = MainWindow()
    mainWindow.show()
    sys.exit(app.exec_())

In this example, the main window is a QWidget and a child window OverlayWindow is created during initialization. The parent window of OverlayWindow is set to the main window, making it a child window of the main window. OverlayWindow achieves a transparent background and semi-transparent effect by setting window attributes and style sheets. Finally, both windows are displayed by calling show().

Please note that this is just a simple example and the actual implementation may vary depending on the programming language and window library used.

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