Are there any signals emitting while minimize/maximize the application

if main application is maximized/minimized are their any signals emitting?

Yes. These things are unrelated.

then how to known when the app. is maximized/minimized , my problem is, if i known when app. is maximized/minimized then i can resize widget in that app.

One way you can re-implement void QWidget::changeEvent ( QEvent * event );
and look for QEvent::WindowStateChange

or install an event filter to catch QEvent::WindowStateChange

I somehow have a feeling that this will not solve your propblem:(

Quote:

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Originally Posted by narlapavan

then how to known when the app. is maximized/minimized , my problem is, if i known when app. is maximized/minimized then i can resize widget in that app.

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resizing should be done with layouts otherwise you are asking for trouble (unless you really know what you are doing.)

Quote:

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Originally Posted by narlapavan

then how to known when the app. is maximized/minimized , my problem is, if i known when app. is maximized/minimized then i can resize widget in that app.

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Why do you want to resize a widget if it is minimized to the taskbar (i.e. its window is not visible)?