如何在QCombobox中为分隔符添加样式表

Question

我在qcombobox中添加了两个带分隔符的项目

addItem("New");
addItem("Delete");
insertSeparator(2);

为了突出选择具有不同风格的项目,我使用QLIstView作为QComboBox视图,样式表为

QListView * listView = new QListView(this);
this->setView(listView);

listView->setStyleSheet("QListView::item {                              \
                            color: black;                                    \
                            background: white;                           }  \
                            QListView::item:selected {                     \
                            color: white;                                  \
                            background-color: #0093D6  \
                            }                                               \
                            ");

现在问题是分隔符根本不可见..它在项目之间显示一个空的空白区域.我对样式表不太好,所以我对如何为分隔符制作新样式表没有太多明确的想法.

Answer 1

您必须itemDelegate为自己创建一个自定义QListView.

您可以QItemDelegate创建自己的委托类.使用sizeHint函数设置分隔符的大小并在paint函数中绘制它.检查项目是否为分隔符index.data(Qt::AccessibleDescriptionRole).toString().

#ifndef COMBOBOXDELEGATE_H
#define COMBOBOXDELEGATE_H

#include <QItemDelegate>

class ComboBoxDelegate : public QItemDelegate
{
    Q_OBJECT
public:
    explicit ComboBoxDelegate(QObject *parent = 0);

protected:
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
    QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
};

#endif // COMBOBOXDELEGATE_H

 

void ComboBoxDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    if(index.data(Qt::AccessibleDescriptionRole).toString() == QLatin1String("separator"))
    {
        painter->setPen(Qt::red);
        painter->drawLine(option.rect.left(), option.rect.center().y(), option.rect.right(), option.rect.center().y());
    }
    else
        QItemDelegate::paint(painter, option, index);
}

QSize ComboBoxDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QString type = index.data(Qt::AccessibleDescriptionRole).toString();
    if(type == QLatin1String("separator"))
        return QSize(0, 2);
    return QItemDelegate::sizeHint( option, index );
}

然后将您的自定义委托设置为listView:

listView->setItemDelegate(new ComboBoxDelegate);.