CTreeCtrl的用法

 今天简单的学了下CTreeCtrl，新建一个基于单文档的MFC工程，在resource的IDD_DIALOG1里添加一个tree control，将其styles勾上has buttons，has lines，lines at root，通过classWizard添加一个继承于CDialog的类CExDialog，添加私有成员变量CImageList m_imageList，然后就在OnInitDialog()函数里添加树控件的细节：

BOOL CExDialog::OnInitDialog()
{
    CDialog::OnInitDialog();
    HICON hlcon[8];
   
    m_imageList.Create( 16, 16, 0, 8, 8 );

    hlcon[0] = AfxGetApp()->LoadIcon( IDI_ICON1 );
    hlcon[1] = AfxGetApp()->LoadIcon( IDI_ICON2 );
    hlcon[2] = AfxGetApp()->LoadIcon( IDI_ICON3 );
    hlcon[3] = AfxGetApp()->LoadIcon( IDI_ICON4 );
    hlcon[4] = AfxGetApp()->LoadIcon( IDI_ICON5 );
    hlcon[5] = AfxGetApp()->LoadIcon( IDI_ICON6 );
    hlcon[6] = AfxGetApp()->LoadIcon( IDI_ICON7 );
    hlcon[7] = AfxGetApp()->LoadIcon( IDI_ICON8 );

    for ( int n =0; n <8; n ++ )
    {
        m_imageList.Add( hlcon[n] );
    }

    CTreeCtrl* pTree = (CTreeCtrl*)GetDlgItem( IDC_TREEVIEW1 );
    pTree->SetImageList( &m_imageList, TVSIL_NORMAL );
    TV_INSERTSTRUCT tvinsert;
    tvinsert.hParent = NULL;
    tvinsert.hInsertAfter = TVI_LAST;
    tvinsert.item.mask = TVIF_IMAGE | TVIF_SELECTEDIMAGE | TVIF_TEXT;
    tvinsert.item.hItem = NULL;
    tvinsert.item.state =0;
    tvinsert.item.stateMask =0;
    tvinsert.item.cchTextMax =6;
    tvinsert.item.iSelectedImage =1;
    tvinsert.item.cChildren =0;
    tvinsert.item.lParam =0;
    tvinsert.item.iImage =0;

/**///
    tvinsert.item.pszText ="HOMER";
    HTREEITEM hDad = pTree->InsertItem( &tvinsert );

/**///
    tvinsert.item.pszText ="Marge";
    HTREEITEM hMom = pTree->InsertItem( &tvinsert );

    tvinsert.hParent = hDad;
    tvinsert.item.pszText ="Bart";
    tvinsert.item.iImage =3;
    pTree->InsertItem( &tvinsert );

    tvinsert.hParent = hMom;
    tvinsert.item.pszText ="Lisa";
    tvinsert.item.iImage =6;
    pTree->InsertItem( &tvinsert );
   
    tvinsert.item.pszText ="Dilbart";
    HTREEITEM hOther = pTree->InsertItem( &tvinsert );

    tvinsert.hParent = hOther;
    tvinsert.item.pszText ="Dogbert";
    tvinsert.item.iImage =7;
    pTree->InsertItem( &tvinsert );

    tvinsert.item.pszText ="Ratbert";
    pTree->InsertItem( &tvinsert );
       
    return TRUE;  // return TRUE unless you set the focus to a control
                  // EXCEPTION: OCX Property Pages should return FALSE
}

这样就建立了两个父节点，HOMER和Marge，tvinsert.item.iSelectedImage
设置了当选中这项时显示什么图标，tvinsert.item.iImage设置了当没有选中时显示的图标，tvinsert.item.pszText设置显示出来的文本。如果没有对tvinsert.hParent进行更改设置，那么新添加的节点和上一个节点的父节点为同一节点。
下面这段代码实现了选中某一项进行的更改操作：

void CExDialog::OnSelchangedTreeview1(NMHDR* pNMHDR, LRESULT* pResult)
{
    NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
   
    CTreeCtrl* pTree = (CTreeCtrl*)GetDlgItem(IDC_TREEVIEW1);
    HTREEITEM hSelected = pNMTreeView->itemNew.hItem;
    if ( hSelected != NULL )
    {
        char text[31];
        TV_ITEM item;
        item.mask = TVIF_HANDLE | TVIF_TEXT;
        item.hItem = hSelected;
        item.pszText = text;
        item.cchTextMax =30;
        VERIFY( pTree->GetItem(&item) );
        SetDlgItemText( IDC_TREEVIEW1, text );
    }

    *pResult =0;
}

有了这些代码还是不够的，如果想显示的话，我们要把这个头文件加入到TreeTestView.cpp里，添加OnLButtonDown事件，并添加一段代码：

CExDialog dlg;     dlg.DoModal();

       ok，这样编译运行下，点击鼠标左键，就会出现一个树状控件，呵呵，简单吧。。。 这些只是实现了静态添加树节点。以后还要深入的学习！

 

 

 

转载于:https://www.cnblogs.com/toconnection/archive/2012/08/08/CTreeCtrl.html