Toolbar's Action Disable Problem [SOLVED]

[kingsta]

Hello guys.

I want to disable a toolbar button sometimes. I mean toolbar button is unclickable and visible. I look for the internet but I cant find the solution.

This code crush my program.
@filterAction->setEnabled(false);@

createActions()
@filterAction = new QAction(tr("&Filter Data"), this);
filterAction->setIcon(QIcon("filter.ico"));
connect(filterAction, SIGNAL(triggered()), this, SLOT(filterData()));
...
@

createToolbars()
@QToolBar *toolbar;
toolbar = addToolBar(tr("Processes"));
toolbar->addAction(filterAction);
...
@

[mbnoimi]

I suggest to use this instead:

@connect(filterAction, SIGNAL(triggered(bool)), this, SLOT(filterData()));@

and this conection for the slot:

@if (checked)
filterAction->setEnabled(true);
else
filterAction->setEnabled(false);@

[mbnoimi]

don't forget to add:

@filterAction->setCheckable(true);@

[raven-worx]

@mbnoimi:
He wanted to know how to "disable ":http://qt-project.org/doc/qt-4.8/qaction.html#enabled-propan action not to make it checkable. So i think this is not what the intended.

[quote author="kingsta" date="1367141772"]
This code crush my program.
@filterAction->setEnabled(false);
[/quote]
What do you mean with "crush"? You program crashes when you do this? If so make sure that the pointer has been already initialized.

[kingsta]

[quote author="mbnoimi" date="1367142196"]I suggest to use this instead:

@connect(filterAction, SIGNAL(triggered(bool)), this, SLOT(filterData()));@
[/quote]

Okey. I changed the code. I dont know the different between triggered() and triggered(bool). Can you tell to me?

[quote author="raven-worx" date="1367143959"]
What do you mean with "crush"? You program crashes when you do this? If so make sure that the pointer has been already initialized.
[/quote]

You totally right. I realize I have a pointer problem. I fix it. It works.

I have a question. How can i connect the toolbar view changing?
I write that code but I got the message;
@ QObject::connect: Cannot connect (null)::visibilityChanged(bool) to MainWindow::controlToolBarView()@

code
@ connect(toolbar, SIGNAL(visibilityChanged(bool)), this, SLOT(controlToolBarView()));
@

[SGaist]

triggered(bool) is for when your tool button is checkable. The parameter tells you where you checked it (true) or unchecked it.

The error message says that your connecting a NULL pointer. Are you sure you toolbar variable points to a valid QToolbar when calling connect ?

[kingsta]

[quote author="SGaist" date="1367185839"]triggered(bool) is for when your tool button is checkable. The parameter tells you where you checked it (true) or unchecked it.

The error message says that your connecting a NULL pointer. Are you sure you toolbar variable points to a valid QToolbar when calling connect ?[/quote]
You right. I fix the error.

Thank all of you guys.