定制QT有标题的扁平化下拉框控件-QComboBox+QLineEdit+QListView

class QTComboBoxButton : public QLineEdit
{
    Q_OBJECT
public:
    QTComboBoxButton(QWidget *parent = 0);
    ~QTComboBoxButton();

protected:
    void mousePressEvent(QMouseEvent *);
};

QTComboBoxButton::QTComboBoxButton(QWidget *parent /* = 0 */) :
    QLineEdit(parent)
{
}

QTComboBoxButton::~QTComboBoxButton()
{
}

void QTComboBoxButton::mousePressEvent(QMouseEvent * e)
{
    QComboBox* combo = dynamic_cast<QComboBox*>(parent());
    if(combo)
        combo->showPopup();
}

QComboBox* myCombo = new QComboBox;
    myCombo->setView(new QListView());
    myCombo->setEditable(true);
    myCombo->setLineEdit(new QTComboBoxButton(m_pAnswer));
    myCombo->lineEdit()->setReadOnly(true);
    myCombo->addItem("Option1");
    myCombo->addItem("Option2");
    myCombo->addItem("Option3");
    myCombo->setMaxVisibleItems(myCombo->count());
    myCombo->lineEdit()->setText("Please select");
    QString arrowImagePath = "c:\arrow.png";
    myCombo->setStyleSheet("QComboBox {font-family: \"Arial\"; font-size: 13px; padding: 3px 0x 3px 5px;}"
        "QComboBox::drop-down {subcontrol-origin: padding; subcontrol-position: top right; width: 30 px; border: 0px;}"
        "QComboBox::down-arrow {image: url("+ arrowImagePath +");}");
    myCombo->view()->setStyleSheet("QListView {font-family: \"Arial\"; font-size: 13px; outline: 0px;}"
        "QListView::item {padding: 3px 0x 3px 5px; border-width: 0px;}"
        "QListView::item:selected {background-color: rgb(74, 144, 226);}");