How to find the presence of scroll bars at run time

**anju123** · 25th July 2007, 13:25

Rajesh,
these calls are the member function of QScrollView or QAbstractScrollArea.
I am using QTabWidget class.

**jpn** · 25th July 2007, 13:27

I presume you use QTextEdit for showing the text. QTextEdit is a QAbstractScrollArea.

**marcel** · 25th July 2007, 13:31

But a tab widget does not automatically adds scroll bars.
You must add them manually.

The only scroll it adds automatically is the scroll for the tab bar widgets.

Could you provide a screenshot?
Or at least make sure of who's adding the scroll bars...
Could it be one of the widgets in the tab widget?

Regards

**anju123** · 26th July 2007, 10:20

May be I had framed the query incorrectly. The scroll bar is added automatically by the tab bar widgets, property (use scrollbuttons)
I have also added the screenshot.

**marcel** · 26th July 2007, 10:33

Oh, in this case you need a hack. You have to subclass the tab widget in order to have access to its QTabBar.

Qt Code:

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bool TabWidget::hasVisibleScroll() 
{
  int tabCount = tabBar()->count();
  QRect tabBarRect = tabBar()->geometry();
  QPoint barTopRight = tabBarRect.topRight();
 
  QRect tabRect = tabBar()->tabRect(tabCount-1);
  if( tabRect.topLeft.x() >= barTopRight.x() )
     return true;
 return false;
}

bool TabWidget::hasVisibleScroll() 
{
  int tabCount = tabBar()->count();
  QRect tabBarRect = tabBar()->geometry();
  QPoint barTopRight = tabBarRect.topRight();
  
  QRect tabRect = tabBar()->tabRect(tabCount-1);
  if( tabRect.topLeft.x() >= barTopRight.x() )
     return true;
 return false;
}

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regards

**anju123** · 28th July 2007, 20:28

thanks marcel for the code..
just one thing the line if( tabRect.topLeft.x() >= barTopRight.x(i) ), is giving me the "true" status in both the cases.
In my case the TabWidget is given a resize event during the initialisation of the screen , but the above code always gives the default size, so I have modified the code to the code given below:
if(tabRect.topLeft().x() >= QApplication::desktop()->width() )
The tabbar is resized to desktop's width in the starting.

**marcel** · 28th July 2007, 20:30

Originally Posted by anju123

thanks marcel for the code..
just one thing the line if( tabRect.topLeft.x() >= barTopRight.x(i) ), is giving me the "true" status in both the cases.
In my case the TabWidget is given a resize event during the initialisation of the screen , but the above code always gives the default size, so I have modified the code to the code given below:
if(tabRect.topLeft().x() >= QApplication::desktop()->width() )
The tabbar is resized to desktop's width in the starting.

Well, OK then. I didn't know in exactly what moment you needed it.
I thought you wanted to know if scrollbars are present somewhere during runtime, after initialization.

Regards