单文档建的树,想实现双击展开/闭合,且图标要变化
void TreeView::OnLButtonDblClk(UINT nFlags, CPoint point)
{
HTREEITEM hItem = ptheTree->HitTest(point, &nFlags); //获得鼠标点击相关项
CString s = ptheTree->GetItemText(hItem);
if (hItem != NULL && !JudgeIsNotebook(hItem) && s !="回收站")
{
if (isExpand == false) //还没展开,将其展开
{
changeRootBitmap(point, nFlags); //切换图标
ptheTree->SetItemState(hItem, 0, LVIS_SELECTED | LVIS_FOCUSED); //取消根项高亮
if (ptheTree->GetChildItem(hItem))
{
HTREEITEM hChildItem = ptheTree->GetChildItem(hItem);
ptheTree->SetItemState(hChildItem, LVIS_SELECTED | LVIS_FOCUSED, LVIS_SELECTED | LVIS_FOCUSED); //将子项高亮
}
}
else //已经展开,将其闭合
{
changeRootBitmap(point, nFlags); //切换图标
ptheTree->SetItemState(hItem, LVIS_SELECTED | LVIS_FOCUSED, LVIS_SELECTED | LVIS_FOCUSED); //将根项高亮
}
isExpand = !isExpand; //更改状态标识
}
//HTREEITEM item = ptheTree->GetSelectedItem();
//ptheTree->SetItemState(item, 0, TVIS_SELECTED);
CTreeView::OnLButtonDblClk(nFlags, point);
}
在根项未展开时,双击后一切正常,根项展开了,图标1也切换为了图标2,但再次双击时(想要闭合根项)就不行了,图标2也切换不回图标1了。
以下是用到的切换图标的函数:
void TreeView::changeRootBitmap(CPoint point, UINT nFlags)
{
HTREEITEM hItem = ptheTree->HitTest(point, &nFlags);
if (hItem != NULL && !JudgeIsNotebook(hItem) && isExpand == false)
{
ptheTree->SetItemImage(hItem, 1, 2);
}
else
ptheTree->SetItemImage(hItem, 2, 1);
/*CMainFrame *pMain = (CMainFrame *)AfxGetApp()->m_pMainWnd;
CDocument * pCurrentDoc = (CDocument *)pMain->GetActiveDocument();
pCurrentDoc->UpdateAllViews(NULL);*/
}