QAction Group Vs. Vector and Array

masoug

Hi,
I am just wondering what is so special about QActionGroup. Why can't I use arrays? (when I did, I ran into Segmentation Faults) and/or vectors? Is QActionGroup a special class that cannot be initiated in the form of an array?

Also;

@
...
ActionGroup->addAction(myAction);
delete myAction;
@

is "myAction" now part of "ActionGroup" or is it now deleted? Does QActionGroup store action objects?

Thanks!

-Masoug

? Offline

[quote author="masoug" date="1285381463"]Hi,
I am just wondering what is so special about QActionGroup. ... Does QActionGroup store action objects?
-Masoug[/quote]

Have you checked the docs for QActionGroup in the Qt Assistant?

@
delete myAction;
@

If you want to remove myAction from the group, you should just use removeAction(myAction). Calling delete will "delete" myAction.

Franzk

You can set a QActionGroup to be exclusive (only one action can be checked at a time). And more probably.

masoug

[quote author="chetankjain" date="1285398264"]
If you want to remove myAction from the group, you should just use removeAction(myAction). Calling delete will "delete" myAction.[/quote]

So if I just call @delete myAction;@ will I still be able to find "myAction" in "ActionGroup"? Or does "ActionGroup" have a copy of "myAction"?

Thanks!

-Masoug

Franzk

[quote author="masoug" date="1285433909"]So if I just call @delete myAction;@ will I still be able to find "myAction" in "ActionGroup"? Or does "ActionGroup" have a copy of "myAction"?[/quote]

Most certainly note. QActionGroups holds a pointer to myAction. When myAction is deleted, QActionGroup receives the destroyed() signal from myAction and removes it from it's internal list.

Having said that, it's always better/safer to call deleteLater() on QObjects:

@myAction->deleteLater()@

masoug

Okay, Thanks! I got it now.

-Masoug

masoug

Oh, and by the way, why does the compiler complain about a segmentation fault when I:

@

myAction[index] = QAction(tr("HI"), this);

@

That was kinda the basis of my question...

Thanks!

-Masoug

DenisKormalev

masoug, what is myAction in this case and how have it been inititalized?

Franzk

Do remember that QAction is a QObject and can therefore not be copied. If you want to pass the QAction around, use pointers to the thing.

@myAction[index] = new QAction(tr("HI"), this);@

Of course myAction has to be of the type QAction *[].