qt error: invalid use of incomplete type 'class TImgWidget'

D:\QT_Project\ImgViewTool\mainwindow.cpp:27: error: invalid use of incomplete type 'class TImgWidget'
..\mainwindow.cpp: In member function 'void MainWindow::recvImgShowSignal(QImage)':
..\mainwindow.cpp:27:44: error: invalid use of incomplete type 'class TImgWidget'
m_Image = new TImgWidget(&ConvertPixmap);//瀹炰緥鍖栫被TImgWidgett鐨勫璞_Image锛岃绫荤户鎵胯嚜QGraphicsItem锛屾槸鑷繁鍐欑殑绫�
^

无效使用不完整类型

解决方法：