简单示例， QTreeView加进度条

#include  < QApplication >
#include  < QLineEdit >
#include  < qDebug >
#include  < QTime >
#include  < QTreeWidget >
#include  < QStringList >
#include  < QItemDelegate >
#include  < QProgressBar >
class  ImageDelegate :  public  QItemDelegate
{


public :
    ImageDelegate(QObject  * parent  =   0 ):QItemDelegate(parent){};
    QWidget  * createEditor(QWidget  * parent,  const  QStyleOptionViewItem  & option,
                 const  QModelIndex  & index)  const
    {
                QProgressBar  * progress  =   new  QProgressBar(parent);
                progress -> setValue( 20 );
                 return  progress;
     };
};
int  main( int  argc,  char   * argv[])
{
    QApplication a(argc, argv);
        QTreeWidget tree;
        tree.setColumnCount( 2 );
        tree.setHeaderLabels(QStringList()  <<   " colum " );
        tree.setItemDelegate( new  ImageDelegate( & tree));
        QTreeWidgetItem  * item1  =   new  QTreeWidgetItem( & tree);
        item1 -> setIcon( 0 , QIcon( " E:\\Audio_MIME.ico " ));
        tree.openPersistentEditor(item1);
        QTreeWidgetItem  * item2  =   new  QTreeWidgetItem( & tree);
        item2 -> setText( 0 ,  " aaaa " );
        tree.show();
     return  a.exec();
}