It's easy to lose track of windows that pop up in front of QGIS. As soon as the user changes focus to move the main QGIS application window, your dialog can disappear behind it, forcing the user to rearrange their whole desktop to find the smaller window again. Fortunately, Qt has a window setting called hint, which allows you to force a window to stay on top. This type of dialog is called a modal dialog. In this recipe, we'll create a message dialog using hint.
Open the QGIS Python Console by selecting the Plugins menu and then clicking on Python Console.
In this recipe, we will create a simple message dialog and set it to stay on top, as follows:
from PyQt4.QtGui import * from PyQt4.QtCore import *
msg = " This window will always stay on top."
lbl = QLabel(msg, None, Qt.WindowStaysOnTopHint)
lbl.resize(400,400) lbl.show()