QTabWidget custom draw and empty in designer problems.

[paulz]

I want to show an empty QTabWidget in the designer but it seems this is not possible, so I have to remove it in code?

After removing it in code I get an empty tab widget where I would like to display some text in a label in the middle of the tab widget. My question is how can I achieve this?

[paulz]

I managed to figure this out, it seemed pretty simple.

customtab.hpp

#ifndef CUSTOMTAB_HPP
#define CUSTOMTAB_HPP
 
#include <QTabWidget>
#include <QLabel>
 
class CustomTab : public QTabWidget
{
public:
    CustomTab( QWidget* aParent = 0 );
    ~CustomTab();
    virtual void tabInserted( int aIndex );
    virtual void tabRemoved( int aIndex );
    virtual void resizeEvent(QResizeEvent* aEvent );
protected:
    void SetLabelPosition();
private:
    QLabel* iLabel;
};
 
#endif // CUSTOMTAB_HPP

#ifndef CUSTOMTAB_HPP
#define CUSTOMTAB_HPP

#include <QTabWidget>
#include <QLabel>

class CustomTab : public QTabWidget
{
public:
    CustomTab( QWidget* aParent = 0 );
    ~CustomTab();
    virtual void tabInserted( int aIndex );
    virtual void tabRemoved( int aIndex );
    virtual void resizeEvent(QResizeEvent* aEvent );
protected:
    void SetLabelPosition();
private:
    QLabel* iLabel;
};

#endif // CUSTOMTAB_HPP

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customtab.cpp

#include "customtab.hpp"
#include <QTabBar>
 
CustomTab::CustomTab( QWidget* aParent )
        : QTabWidget( aParent ), iLabel( NULL )
{
    iLabel = new QLabel( this );
    iLabel->setText( "Double click on a file segment to open it." );
    if (count())
    {
        iLabel->setVisible(false);
    }
    iLabel->setWordWrap(true);
    SetLabelPosition();
}
 
CustomTab::~CustomTab()
{
    delete iLabel;
}
 
void CustomTab::tabInserted( int aIndex )
{
    if ( count() )
    {
        iLabel->setVisible(false);
    }
}
 
void CustomTab::tabRemoved( int aIndex )
{
    if ( !count() )
    {
        iLabel->setVisible(true);
    }
}
 
void CustomTab::resizeEvent( QResizeEvent* aEvent )
{
    QTabWidget::resizeEvent( aEvent );
    SetLabelPosition();
}
 
void CustomTab::SetLabelPosition()
{
    int xpos = width() /2 - iLabel->width() / 2;
    int ypos = height() /2 - iLabel->height() /2;
    iLabel->move( xpos, ypos );
}
 
// End of file

#include "customtab.hpp"
#include <QTabBar>

CustomTab::CustomTab( QWidget* aParent )
        : QTabWidget( aParent ), iLabel( NULL )
{
    iLabel = new QLabel( this );
    iLabel->setText( "Double click on a file segment to open it." );
    if (count())
    {
        iLabel->setVisible(false);
    }
    iLabel->setWordWrap(true);
    SetLabelPosition();
}

CustomTab::~CustomTab()
{
    delete iLabel;
}

void CustomTab::tabInserted( int aIndex )
{
    if ( count() )
    {
        iLabel->setVisible(false);
    }
}

void CustomTab::tabRemoved( int aIndex )
{
    if ( !count() )
    {
        iLabel->setVisible(true);
    }
}

void CustomTab::resizeEvent( QResizeEvent* aEvent )
{
    QTabWidget::resizeEvent( aEvent );
    SetLabelPosition();
}

void CustomTab::SetLabelPosition()
{
    int xpos = width() /2 - iLabel->width() / 2;
    int ypos = height() /2 - iLabel->height() /2;
    iLabel->move( xpos, ypos );
}

// End of file

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