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void CdemoDlg::OnNcLButtonDown(UINT nHitTest, CPoint point){
if (m_RectTitle_Tablectrl.PtInRect(point)&& TabPage !=1){ //!=1 is wrote to prevent program to draw again
TabPage = 1; //tabpage是页面代号
InvalidateRect(CRect(m_rect_axial.left, m_rect_axial.top, m_dig_rect5.right+15, m_dig_rect2.bottom+20), TRUE);
InvalidateRect(CRect(1030, 150, 1270, 800), TRUE); // 这两句都是将背景里的线擦除
previousBtn.ShowWindow(TRUE);
GetDlgItem(IDC_EDIT1)->ShowWindow(TRUE);
}
page2 类似