Qt之qSort

http://blog.sina.com.cn/s/blog_a6fb6cc90102v617.html

 Qt中可以使用qSort可以对容器排序,助手中有很多示例,大多数关于int、QString的排序,今天这里主要讲解qSort如何对结构体进行排序的。


Qt对整形排序:
QList list;
list << 33 << 12 << 68 << 6 << 12;
qSort(list.begin(), list.end());
// list: [ 6, 12, 12, 33, 68 ]

Qt对字符串排序:
bool caseInsensitiveLessThan(const QString &s1, const QString &s2)
{
    return s1.toLower() < s2.toLower();
}

int doSomething()
{
    QStringList list;
    list << "AlPha" << "beTA" << "gamma" << "DELTA";
    qSort(list.begin(), list.end(), caseInsensitiveLessThan);
    // list: [ "AlPha", "beTA", "DELTA", "gamma" ]
}

Qt对结构体排序:
struct BarAmount
{
    int barLevel;  //钢筋级别
    QString diameter;  //钢筋直径
    double planAmount;  //计划量
    double purchaseAmount;  //采购量
    double amount;  //总量
};
结构体如上所示, 对QList barDataList可通过以下方式进行排序!
void OverdraftControl::sortBarData(QList *barDataList)
{
    qSort(barDataList->begin(), barDataList->end(), compareBarData);
}
bool compareBarData(const BarAmount &barAmount1, const BarAmount &barAmount2)
{
    if (barAmount1.barLevel < barAmount2.barLevel)
    {
        return true;
    }
    else if (barAmount1.barLevel > barAmount2.barLevel)
    {
        return false;
    }
    else
    {
        QString strDiameter1 = barAmount1.diameter;
        QString strDiameter2 = barAmount2.diameter;
        int nCompare = compareDiameterDescription(strDiameter1,strDiameter2);
        if (nCompare == -1)
        {
            return true;
        }
        else if (nCompare == 1)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
}
直接调用sortBarData(&barDataList)就可以完成对QList barDataList的排序了!

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