qtreewidget基本使用_qtreewidget列宽自适应

#include <QTreeWidget>
#include <QTreeWidgetItem>
#include <QStringList>
#include <QSpinBox>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);

    QTreeWidget* treeWidget = new QTreeWidget(this);
    treeWidget->setWindowTitle("QTreeWidget");
    //设定头项名称
    treeWidget->setHeaderLabels(QStringList()<<"Key"<<"Value");
    
    treeWidget->setSortingEnabled(true);
    //treeWidget->header()->setSortIndicatorShown(true);//设置排序指示符是否显示
    treeWidget->header()->setSortIndicator(0,Qt::AscendingOrder);//为第0列设置排序指示符为升序

    //设定各个项
    QTreeWidgetItem* A = new QTreeWidgetItem(QStringList()<<"A");
    A->setIcon(0, QIcon(":/images/a.png"));//资源文件前缀为/
    A->setCheckState(0, Qt::Checked);

    QTreeWidgetItem* B = new QTreeWidgetItem(QStringList()<<"B");
    B->setIcon(0, QIcon(":/images/b.png"));
    B->setCheckState(0, Qt::Checked);

    QTreeWidgetItem* C = new QTreeWidgetItem(QStringList()<<"C");
    C->setIcon(0, QIcon(":/images/c.png"));
    C->setCheckState(0, Qt::Checked);

    treeWidget->addTopLevelItem(A);//添加顶级项A
    treeWidget->addTopLevelItem(B);//添加顶级项B
    treeWidget->addTopLevelItem(C);//添加顶级项C

    for(int i=0; i<3; ++i)//给A添加子项目
    {
        QStringList columItemList;
        QTreeWidgetItem *child;
        QString key, value;
        key += "a" + QString::number(i);
        value += QString::number(i);
        columItemList<<key<<value;
        child = new QTreeWidgetItem(columItemList);
        A->addChild(child);
        treeWidget->setItemWidget(child,1,new QSpinBox);//将QSpinBox显示到child项的第一列里
    }

    treeWidget->show();
}

treeWidget->setItemWidget(child,1,new QSpinBox)