AddressBar.cpp Example File

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 #include "AddressBar.h"

 #include <QtCore>
 #include <QtGui>

 class LineEdit: public QLineEdit
 {
 public:
     LineEdit(QWidget *parent = 0): QLineEdit(parent) {}

     void paintEvent(QPaintEvent *event) {
         QLineEdit::paintEvent(event);
         if (text().isEmpty()) {
             QPainter p(this);
             int flags = Qt::AlignLeft | Qt::AlignVCenter;
             p.setPen(palette().color(QPalette::Disabled, QPalette::Text));
             p.drawText(rect().adjusted(10, 0, 0, 0), flags, "Enter address or search terms");
             p.end();
         }
     }
 };

 AddressBar::AddressBar(QWidget *parent)
     : QWidget(parent)
 {
     m_lineEdit = new LineEdit(parent);
     connect(m_lineEdit, SIGNAL(returnPressed()), SLOT(processAddress()));
     m_toolButton = new QToolButton(parent);
     m_toolButton->setText("Go");
     connect(m_toolButton, SIGNAL(clicked()), SLOT(processAddress()));
 }

 QSize AddressBar::sizeHint() const
 {
     return m_lineEdit->sizeHint();
 }

 void AddressBar::processAddress()
 {
     if (!m_lineEdit->text().isEmpty())
         emit addressEntered(m_lineEdit->text());
 }

 void AddressBar::resizeEvent(QResizeEvent *event)
 {
     int x, y, w, h;

     m_toolButton->adjustSize();
     x = width() - m_toolButton->width();
     y = 0;
     w = m_toolButton->width();
     h = height() - 1;
     m_toolButton->setGeometry(x, y, w, h);
     m_toolButton->show();

     x = 0;
     y = 0;
     w = width() - m_toolButton->width();
     h = height() - 1;
     m_lineEdit->setGeometry(x, y, w, h);
     m_lineEdit->show();
 }

 void AddressBar::focusInEvent(QFocusEvent *event)
 {
     m_lineEdit->setFocus();
     QWidget::focusInEvent(event);
 }