自定义QStyledItemDelegate以绘制具有多种颜色的文本

#include <QStyledItemDelegate>
#include <QPainter>

class ColorDelegate : public QStyledItemDelegate
{
public:
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override
    {
        QStyledItemDelegate::paint(painter, option, index);

        // 获取项的文本
        QString text = index.data(Qt::DisplayRole).toString();

        // 设置绘制的颜色
        QColor color1(Qt::red);
        QColor color2(Qt::blue);

        // 绘制文本
        painter->save();
        painter->setPen(color1);
        painter->drawText(option.rect, Qt::AlignLeft | Qt::AlignVCenter, text.left(text.length() / 2));
        painter->setPen(color2);
        painter->drawText(option.rect, Qt::AlignRight | Qt::AlignVCenter, text.mid(text.length() / 2));
        painter->restore();
    }
};

#include <QApplication>
#include <QListView>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    // 创建一个QListView
    QListView listView;

    // 创建一个数据模型
    QStringListModel model;
    model.setStringList(QStringList() << "Item 1" << "Item 2" << "Item 3");

    // 将数据模型设置给QListView
    listView.setModel(&model);

    // 创建自定义代理
    ColorDelegate delegate;

    // 将自定义代理设置给QListView
    listView.setItemDelegate(&delegate);

    // 显示QListView
    listView.show();

    return app.exec();
}