[提问]继承的QtreeWidgetItem类希望能够得到QTreewidget的信号 [复制链接]

QCustomTreeWidgetItem 继承自QTreeWidgetItem，希望能够得到QTreewidget发出的信号比如ItemChanged，但是itemchanged的信号参数是QTreeWidgetItem,如果强制connect就会产生内存错误，请问怎么才能解决这个问题

有人来指导指导吗

在你处理ItemChanged信号的槽里 强制将QTreeWidgetItem转化成QCustomTreeWidgetItem

不行的，在没有收到itemchanged的信号之前，程序就挂掉了

可以呀......

QTreeTest::QTreeTest(QWidget *parent, Qt::WFlags flags)
    : QWidget(parent, flags)
{
    ui.setupUi(this);


    ui.treeWidget->setColumnCount(1);
    QList<QTreeWidgetItem *> items;
    for (int i = 0; i < 10; ++i)
        items.append(new QCustomTreeWidgetItem((QTreeWidget*)0, QStringList(QString("item: %1").arg(i))));
    ui.treeWidget->insertTopLevelItems(0, items);
    connect(ui.treeWidget , SIGNAL(itemClicked ( QTreeWidgetItem * , int  )) , this , SLOT(doSomething(QTreeWidgetItem * , int)));
    connect(ui.treeWidget , SIGNAL(itemChanged ( QTreeWidgetItem * , int  )) , this , SLOT(hasChangde(QTreeWidgetItem * , int)));
}


QTreeTest::~QTreeTest()
{


}


void QTreeTest::doSomething(QTreeWidgetItem * item, int column)
{
    QString str("changed");
    item->setData ( column, 0, str);
}


void QTreeTest::hasChangde(QTreeWidgetItem * item, int column)
{
    ((QCustomTreeWidgetItem *)item) ->useMe();
}


QCustomTreeWidgetItem::QCustomTreeWidgetItem ( QTreeWidget * parent, const QStringList & strings)
: QTreeWidgetItem(parent , strings)
{
    
}
QCustomTreeWidgetItem::~QCustomTreeWidgetItem()
{
    
}
void QCustomTreeWidgetItem::useMe()
{
    QString str;
    str.sprintf("%5d" , 4);
}


---------------------------------------------
useMe是能进入的并执行的

我这里只要connect过，然后点击tree，就会挂掉了

代码呢？

用qRegisterMetaType试试

Q_DECLARE_METATYPE(QCustomTreeWidgetItem);
qRegisterMetaType<QCustomTreeWidgetItem>( );

再
connect(....)