QLineEdit losing focus when pressing the Shift-Key

Coding
1

I have a GUI that can float and also be docked. When the GUI is docked, my QLineEdit is losing focus whenever I press the Shift Key and the Mouse is outside the GUI extents.
I saw in the Bug Fixes for Maya 2014 that an issue with QLineEdits losing focus was addressed, however, it doesn’t seem to cover the case that QLineEdit is part of a Docked GUI.

Would be possible to install some kind of event filter on my QLineEdit to capture Shift Keys and FocusLost and restore Focus to the QLineEdit?

2

i had to subclass QLIneEdit to get maya not to steal focus, use it in place of QLineEdits


class LineEditSpaces(QtGui.QLineEdit):
    def keyPressEvent(self, event):
        key = event.key()
        if key == QtCore.Qt.Key.Key_Control or key == QtCore.Qt.Key.Key_Shift:
            pass
        else:
            super(LineEditSpaces, self).keyPressEvent(event)
3

A followup question out of laziness…
I have alot of UIs made in QtDesigner with lineEdits that have this problem… to avoid have to go through the hassle of creating a custom widget and getting it into QtDesigner, is there some kind of hack I can do per QMainWindow to trap the keys?

edit: found an answer maybe?
Since my UI was made in Qt Designer, it’s not trivial to replace all the line edits with custom line edits AFAIK…
so what i did was re-implement the keyPressEvent on the QMainWindow like so:


    def keyPressEvent(self, event):
        if event.key() in (QtCore.Qt.Key.Key_Shift, QtCore.Qt.Key.Key_Control):
            event.accept()
        else:
            event.ignore()
4

Does that work? As in, does it not break maya shortcuts, etc.?

5

while my UI has focus, Shift and Control will not be processed by the Maya Main Window, which stops the annoying change of focus. There may be unintended side-effects…

6

I know this is old, but figured i’d get it on the books: To fixup your line edits in the designer, right click > Promoted Widgets

In this window, give it the name of the class and the import string you’d use to get to it. So if your class is in /path/to/file.py and the class is MyLineEdit:

Promoted class name: MyLineEdit
Header file: path.to.file

It will ultimately result in a line at the end of the generated pythong file that looks like:

from path.to.file import MyLineEdit

Then you don’t have to muck around with it after you’ve loaded your ui file, everything is done in the deisgner