Center TabBar horizontally on the TabWidget

[forrestfsu]

I'm trying to center a tabBar horizontally on a tabWidget.

Example:

instead of
| TAB 1 | TAB 2 | Tab 3 |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

I desire
XXXXXXXXXXXXXXXXXX| TAB 1 | TAB 2 | Tab 3 |XXXXXXXXXXXXXXXXXX

I should also state that I'm already using a certain style...so I can't simply switch to the Mac-style (which I believe by default aligns tab horizontally centered).

Any pointers are appreciated.

[guilugi]

Maybe you can tweak the TabBar position using a custom QStyle.
I know there are some elements you can reimplement in there :

http://doc.trolltech.com/4.2/qstyle....ubElement-enum

[forrestfsu]

Thanks for the tip. I'm trying to do something like this, but unfortunately it is not centering it:

int CenterTab::styleHint(StyleHint hint, const QStyleOption *option, const QWidget *widget, QStyleHintReturn *returnData) const
{
  switch (hint)
  {
    case SH_TabBar_Alignment:
       return int(Qt::AlignHCenter);
    default:
       return QWindowsStyle::styleHint(hint, option, widget, returnData);
  }
}

int CenterTab::styleHint(StyleHint hint, const QStyleOption *option, const QWidget *widget, QStyleHintReturn *returnData) const
{
  switch (hint)
  {
    case SH_TabBar_Alignment:
       return int(Qt::AlignHCenter);
    default:
       return QWindowsStyle::styleHint(hint, option, widget, returnData);
  }
}

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Any pointers?

[spud]

If you are using a QTabWidget I would try out

void QTabWidget::setCornerWidget ( QWidget * widget, Qt::Corner corner = Qt::TopRightCorner )

void QTabWidget::setCornerWidget ( QWidget * widget, Qt::Corner corner = Qt::TopRightCorner )

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If you set one expanding widget in each corner, that might center the tabs. If you are not using QTabWidget, you can still have a look at the source code for the above function and do it yourself.

[forrestfsu]

spud, i've been looking into your advice...but I can't seem to understand how to make an expandable widget...can you explain a bit more please?

[forrestfsu]

I'm trying to do something similar to what I demonstrate below...however the size hint is not correctly being shown:

Create a CenterTab class which will be used as the TopLeftCorner widget:

class CenterTab : public QWidget
{
QOBJECT
public:
 CenterTab(int width, int height);
protected:
 QSize sizeHint() const;
private:
 int width;
 int height;
}
 
CenterTab::CenterTab(int width, int height)
{
  width = width;
  height = height;
}
 
QSize CenterTab::sizeHint () const
{
  return QSize(width, height);
}

class CenterTab : public QWidget
{
QOBJECT
public:
 CenterTab(int width, int height);
protected:
 QSize sizeHint() const;
private:
 int width;
 int height;
}

CenterTab::CenterTab(int width, int height)
{
  width = width;
  height = height;
}

QSize CenterTab::sizeHint () const
{
  return QSize(width, height);
}

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Then within your QTabWidget constructor:

centerTab = new CenterTab(100, 25); // You can use any width and height you like
this->setCornerWidget(centerTab, Qt::TopLeftCorner);

centerTab = new CenterTab(100, 25); // You can use any width and height you like
this->setCornerWidget(centerTab, Qt::TopLeftCorner);

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Thanks for the help guys...

[forrestfsu]

Ha, great. I got it...the above works as long as you change:

width= width;
height=height;

width= width;
height=height;

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to:

this->width= width;
this->height=height;

this->width= width;
this->height=height;

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It was a silly mistake. Thanks for all the help!

[fullmetalcoder]

Your code won't center tabs unless there is only a fixed number. You'd better compute the size hint of your center widget according to the number of tabs (or better to their actual size)...

[forrestfsu]

thanks fullmetalcoder...I have already taken that into account in my code. I just gave an example of what I did above incase anyone else runs into the same problem.