c++ - QComboBox : Can we make the entire combobox clickable, 不只是下拉按钮(箭头)本身？

Question

我想在组合框中显示“请选择一个选项”之类的文本，并且不在列表中显示文本，所以我将 setEditable 设置为 true，然后将文本设置为 lineEdit，但在此之后，只有下拉按钮(箭头)是可点击的，我们怎样才能让整个组合框都可以点击呢？我正在使用 QComboBox，如下所示:

QComboBox* combbox= new QComboBox;
combbox->setEditable(true);
combbox->lineEdit()->setReadOnly(true);
combbox->addItem("Option1");
combbox->addItem("Option2");
combbox->lineEdit()->setText("Please select one option");

Answer 1

我解决了这个问题如下:

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* combbox= new QComboBox;
combbox->setEditable(true);
combbox->setLineEdit(new QTComboBoxButton(combbox));
combbox->lineEdit()->setReadOnly(true);
combbox->addItem("Option1");
combbox->addItem("Option2");
combbox->lineEdit()->setText("Please select one option");