Show parent window

[Qt Coder]

I want to call one of my mainwindow function on close event of child window ,how to connect this signal..


Previously I tried

connect(this,SIGNAL(destroyed()),this->parent(),SLOT(f_max()));

connect(this,SIGNAL(destroyed()),this->parent(),SLOT(f_max()));

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but as I m closing a child window using

this->close()

this->close()

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so "destroyed event "is not getting triggered ...