Russian Qt Forum

C++ (Qt)
#include <QApplication>
#include <QLabel>
#include <QLineEdit>
#include <QFormLayout>
#include <QDebug>
 
class EditableLabel : public QLineEdit
{
	Q_OBJECT
public:
		EditableLabel( QWidget* p = 0 )
	: QLineEdit( p )
	{
		if( p )
		{
			QPalette pal = palette();
			pal.setColor( backgroundRole(), p->palette().color( p->backgroundRole() ) );
			setPalette( pal );
		}
		setFrame( false );
		setFocusPolicy( Qt::ClickFocus );
		connect( this, SIGNAL(textEdited(QString)), this, SLOT(resizeByContents()) );
	}
	QSize sizeHint() const
	{
		QRect r = fontMetrics().boundingRect( text() );
		int lm, rm, tm, bm;
		getTextMargins( &lm, &tm, &rm, &bm );
		return QSize( r.width() + lm + rm + 5, QLineEdit::sizeHint().height() );
	}
	QSize minimumSizeHint() const
	{
		return sizeHint();
	}
 
private Q_SLOTS:
		void resizeByContents()
	{
		setFixedWidth( sizeHint().width() );
		if( QWidget* p = parentWidget() )
			p->adjustSize();
	}
};
 
class MyWidget : public QFrame
{
	Q_OBJECT
public:
		MyWidget( QWidget* parent = 0 )
	: QFrame( parent )
	{
		QPalette pal;
		pal.setColor(QPalette::Window, Qt::white);
		this->setPalette( pal );
		this->setAutoFillBackground(true);
		this->setFrameShape(QFrame::Box);
		this->setLineWidth(1);
		fLayout = new QFormLayout(this);
		fLayout->setContentsMargins(5,5,5,5);
		this->setLayout(fLayout);
	}
 
	void addLabels()
	{
		QLineEdit *le = new EditableLabel(this);
		le->setText( "Editable Label" );
		QLabel *label2 = new QLabel("ShowLabel:", this);
		fLayout->addRow(label2, le);
	}
 
private:
	QFormLayout* fLayout;
};
 
int main( int argc, char** argv )
{
	QApplication app( argc, argv );
	MyWidget w;
	w.addLabels();
 
	w.show();
 
	return app.exec();
}
 

int textWidth = fontMetrics.width(text) + text.size() -1