// 样式 
    ui->treeView->setStyleSheet(
             "QTreeView::item{height: 60px;show-decoration-selected: 0;background-image:url(image/list_content_bg.png);}"
             "QTreeView::item:selected{background-image:url(image/list_select_bg.png);}"
             );
  
 //设置图标
 QVariant data(const QModelIndex &index, int role)
 {
 if (!index.isValid())
     return QVariant();
 if(role == Qt::UserRole)
 {
 
 }
  if(role ==Qt::BackgroundRole)
 {
     QImage  image("image/list_bg02.png");
     return QBrush(image);
 }
 if(index.column()==0)
 {
  
     if(role == Qt::DecorationRole)
     {
         QImage image;
         image.load("image/icon_user.png");
         return image;//QIcon("image/icon_user.png");
     }
 }
 图标大小  :属性 iconSize
 ui->treeView->setIconSize(QSize(32,32));