Delete widget

[mahd96]

what happens to child widgets when the parent is deleted?
no deconstructor is implemented.
i have a crash in deleting a parent widget and i guess its because of some thing i didn't consider with children.

[JKSH]

@mahd96 said in Delete widget:

what happens to child widgets when the parent is deleted?

The children are deleted too: https://doc.qt.io/qt-5/objecttrees.html

i have a crash in deleting a parent widget and i guess its because of some thing i didn't consider with children.

Try using deleteLater() instead of delete.

Also, use a debugger and look at the stack trace when it crashes.

[mahd96]

This post is deleted!

[mahd96]

@JKSH it's not working. there is some point that i got to.
for child that has pointer-like defenition(Qwidget *widget=new ...!) must use "this" keyword for initialzing them ( using setparent after creating object cause crash!)
child that are not pointer like must be added to a layout.(again setparent will cause crash!)

these behavior seems odd to me!

[mahd96]

@JKSH i think theres issue with Construction/Destruction Order of QObjects.

[jsulm]

@mahd96 said in Delete widget:

for child that has pointer-like defenition(Qwidget *widget=new ...!) must use "this" keyword for initialzing them ( using setparent after creating object cause crash!)
child that are not pointer like must be added to a layout.(again setparent will cause crash!)

I don't really understand what you're trying to say. Can you show your code? How you're setting parent and how you're deleting?

"i think theres issue with Construction/Destruction Order of QObjects" - I would first check my own code before saying that there is something wrong in the framework (which can, of course, be the case!).

[JKSH]

@mahd96 said in Delete widget:

@JKSH i think theres issue with Construction/Destruction Order of QObjects.

Read the link I gave you: https://doc.qt.io/qt-5/objecttrees.html