show() on parent widget doesn't show the child widgets

[sraju]

Thanks for the response.

We are not explicitly creating hidden windows. Just normal Widget Creation. Are these widgets hidden if we create using new operator ?

We have an old application and they window management has been written using list in C++. I am trying to port that application to Qt such that Qt can take over the window management. So, the order in which the windows are managed in old code should be done in Qt as well.

Is there a way to inform the Qt to process the show() event once after the event loop started.? Or Calling show() does is sufficient?

Please advice

Regards
SRaju

[anda_skoa]

We are not explicitly creating hidden windows. Just normal Widget Creation. Are these widgets hidden if we create using new operator ?

I meant the main window. Do you call show() somewhere in main() before starting the event loop or are you calling show() after creating the children?

By default all widgets are not yet visible and need to be shown. Children are shown with their parent unless they have been explicitly hidden.

So it depends if your main window has already been shown at the time of child creation. If it has, then the children will remain hidden (their parent didn't get shown after their creation).

We have an old application and they window management has been written using list in C++. I am trying to port that application to Qt such that Qt can take over the window management. So, the order in which the windows are managed in old code should be done in Qt as well.

Is this an MDI application? Are you using QMdiArea?

Is there a way to inform the Qt to process the show() event once after the event loop started.? Or Calling show() does is sufficient?

Calling show() is sufficient, it results in an event being sent to the respective widget, so it needs a running event loop to get processed.

Cheers,
_

[sraju]

I meant the main window. Do you call show() somewhere in main() before starting the event loop or are you calling show() after creating the children?

No. I will not be calling the show() I will call the show() on Main Widget After creating the child widgets and it is after the event loop starts.

By default all widgets are not yet visible and need to be shown. Children are shown with their parent unless they have been explicitly hidden.

So it depends if your main window has already been shown at the time of child creation. If it has, then the children will remain hidden (their parent didn't get shown after their creation).

It has answered my query and concludes that each child widgets needs to be shown when they are added after the event loop starts.

Is this an MDI application? Are you using QMdiArea?

No, it's not designed using QMdiArea. We are considering each QWidget as a Window and it is serving our purpose.

Thanks for the support.


Regards
SRaju