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Thread: focusChanged signal being called numerous times every time I click on a widget?

  1. 24th January 2017, 18:07 #1
    aondra
    aondra is offline Beginner
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    Default focusChanged signal being called numerous times every time I click on a widget?

    EDIT WITH SOLUTION:
    The problem was simple. I connected to focusChanged in my custom line edit classes, so for every custom line edit, my slot was being called whenever a focusChanged event came in.

    Moderators: feel free to delete this post.


    Original post below:

    I have an app using QT 5.6.1 that I want to open the Windows Virtual Keyboard if a user clicks on a CustomLineEdit, and close the keyboard if the user clicks anywhere else.

    To do this, I have the focusChanged signal connected to a slot that checks if the "now" widget is a custom line edit, if so it opens the keyboard, if not, it closes the keyboard.

    However, I noticed that this was very laggy, so I added a print statement, and here's what I see every time I click on a custom line edit:

    Qt Code: 
    1. FocusChanged. previous: 00000000 current: 053B4DD0
    2. FocusChanged. previous: 00000000 current: 053B4DD0
    3. FocusChanged. previous: 00000000 current: 053B4DD0
    4. FocusChanged. previous: 00000000 current: 053B4DD0
    5. FocusChanged. previous: 00000000 current: 053B4DD0
    6. FocusChanged. previous: 00000000 current: 053B4DD0
    7. FocusChanged. previous: 00000000 current: 053B4DD0
    8. FocusChanged. previous: 00000000 current: 053B4DD0
    9. FocusChanged. previous: 00000000 current: 053B4DD0
    10. FocusChanged. previous: 00000000 current: 053B4DD0
    11. FocusChanged. previous: 053B4DD0 current: 08964B00
    12. FocusChanged. previous: 053B4DD0 current: 08964B00
    13. FocusChanged. previous: 053B4DD0 current: 08964B00
    14. FocusChanged. previous: 053B4DD0 current: 08964B00
    15. FocusChanged. previous: 053B4DD0 current: 08964B00
    16. FocusChanged. previous: 053B4DD0 current: 08964B00
    17. FocusChanged. previous: 053B4DD0 current: 08964B00
    18. FocusChanged. previous: 053B4DD0 current: 08964B00
    19. FocusChanged. previous: 053B4DD0 current: 08964B00
    20. FocusChanged. previous: 053B4DD0 current: 08964B00
    To copy to clipboard, switch view to plain text mode 

    Is there a reason this is being called so many times?

    Is there anything I can do short from keeping track of the last time I saw a focusChanged event and filtering duplicates?
    Last edited by aondra; 24th January 2017 at 22:07. Reason: Found the solution
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