[Qt-interest] statusBar()

[Denton Vis]

Sorry, just fixing some typos

"Denton Vis" <vistapro7 at hotmail.com> wrote in message 
news:gqh79b$f5j$1 at eple.troll.no...
> Hi Alex,
> I may be wrong but I do not think the problem is with calling methods of a 
> class in C++. It may seem obvious later, but when new to Qt, it may not be 
> as obvious how to get to the top widget sometimes.
>
> I understand that it has more to do with having a main window and several 
> subclasses (widgets) and then getting access to the main window in order 
> to update the status during an operation.
>
By subclasses, I mean child widgets.

> Sujan:
> It is generally a good idea when creating child widgets of your 
> MainWindow, to pass the MainWindow as the parent object. That way, it 
> becomes easy to make a call on the parent and update the status. You could 
> create a method
>
> void ChildWidget::updateStatus(const QString & message) {
> QObject * parent = mainWindow.parent();

    QObject * parent = parent();  //forget the mainWindow.parent(). my bad

> QMainWindow * mainWindow = qobject_cast<QMainWindow*>(parent);
> if (mainWindow) // if cast was successful
>    mainWindow->statusBar()->showMessage(message, 2000);
> return;
> }
>
> and then make a call to this method each time you wish to update the 
> status on the status Bar.
>
> If you update your status bar message a lot, it may help to create a 
> QStatusBar* widget in your child widget and run
> the code once to get a pointer to the status bar: like so.
> QStatusBar* mStatusBar = mainWindow->statusBar();
>

    Of course, only after you have done a cast to get the QMainWindow parent 
as shown above.

> then each time you update the status bar, it is only necessary to call 
> mStatusBar->showMessage(...)
>
> Hope this helps you out.
>
> "Malyushytsky, Alex" <alex at wai.com> wrote in message 
> news:F8145CF983B4DB42855E9BB7F5BE8FCC113ED004 at camail2.wai.com...
>> There is no way to help you, until you read and understand basics of 
>> C++.
>> Don't take it as offence, this is just a reason why you can't be helped 
>> here and you don't get any answer on your second time asked question.
>>
>> Giving you a solution just encourages you to keep flouding this mailing 
>> list with basic C++ question. That makes nothing good even to you.
>> Hope you finally will follow people advice. Start with definition of the 
>> class and object.
>>
>> Once you get it, you will find your first way to do what you want.
>>
>> Regads,
>>     Alex
>>
>>
>> ________________________________________
>> From: qt-interest-bounces at trolltech.com 
>> [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Sujan 
>> Dasmahapatra
>> Sent: Thursday, March 26, 2009 2:55 AM
>> To: qt-interest at trolltech.com
>> Subject: [Qt-interest] statusBar()
>>
>> Dear Friends
>> In my prpoject I have many classes and the  main class is "MainWindow" 
>> which is derived  from QMainWindow. So I am able to show message in my 
>> 'MainWindow' class......How could I show message on the statusBar from 
>> any other class. When I am trying to do that its not happening.Plss tell 
>> me some idea to show message from other class than MainWindow..
>>
>> Kind regards,
>> LM Glasfiber R&D (India) Pvt. Ltd.
>>
>> Sujan Dasmahapatra
>> Project Engineer - CFD
>>
>> Telephone: +91 80 66470248
>> Mobile:
>> E-mail: sdh at lmglasfiber.com
>>
>>
>>
>>
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