develop a custom python qt widget

I have a pyqt widget that displays an image. This widget should be extended so that : * in case no image is set, it displays a dummy image * if an image is dropped on it, this new image is displayed * there are 3 buttons displayed next to the image : * 1 button to clear the image, and display the dummy again * 1 button to open a file browser and select a new image to display * 1 button to open the currently set widget with the default application * * 1 button to clear the image, and display the dummy again * 1 button to open a file browser and select a new image to display * 1 button to open the currently set widget with the default application