我是MFC的新手,我想复制确切的 Ctrl + Page Down 和 Ctrl + Page Up 没有任何支持键的常规 Page Down / Page Up 键的行为( Ctrl / Shift )。我一直试图清除项目的焦点,该项目在敲击键 Page Up 和 Page Down 时自动被选中。
我已尝试使用此代码,但无效:
case VK_NEXT: // pagedown
case VK_PRIOR: // pageup
lhItem = GetFocusedItem();
if (IsSelected(lhItem))
{
CTreeCtrl::SetItemState(lhItem, 0, TVIS_SELECTED);
}
break;
任何人都可以帮我解决它
答案 0 :(得分:0)
本守则需要用OnSelChanging& amp; OnSelChanged事件处理程序函数
void CTreeCtrl::OnSelchanging(NMHDR *pNMHDR, LRESULT *pResult)
{
HTREEITEM hNew = pNMTreeView->itemNew.hItem;
HTREEITEM hOld = pNMTreeView->itemOld.hItem;
m_bOldItemSelected = hOld && (CTreeCtrl::GetItemState(hOld, UINT(TVIS_SELECTED)) & TVIS_SELECTED);
if (GetSelectedCount() > 1)
{
if (m_bPgUpState || m_bPgDownState)
{
//Check the state of New Item
if ((pNMTreeView->itemNew.state & TVIS_SELECTED))
{
// If the item is selected, so make sure OnSelchanged()
// will "select" it !
m_bNewItemSelected = TRUE;
}
else if (!(pNMTreeView->itemNew.state & TVIS_SELECTED))
{
// The New item is not selected, so make sure OnSelchanged()
// will not "re-select" it !
m_bNewItemSelected = FALSE;
CTreeCtrl::SetItemState(hNew, UINT(~TVIS_SELECTED), UINT(TVIS_SELECTED));
}
}
}
void TreeCtrl::OnSelchanged(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
HTREEITEM itemNew = pNMTreeView->itemNew.hItem;
HTREEITEM itemOld = pNMTreeView->itemOld.hItem;
if ((m_bPgUpState || m_bPgDownState) && (GetSelectedCount() > 1)
&& (pNMTreeView->itemOld.hItem != NULL || pNMTreeView->itemNew.hItem != NULL))
{
// It had the focus so Keep selection at old item
if (itemOld && m_bOldItemSelected)
{
CTreeCtrl::SetItemState(itemOld, UINT(TVIS_SELECTED), UINT(TVIS_SELECTED));
m_bOldItemSelected = FALSE;
}
else
{
// Do-not select the item if it is not selected
CTreeCtrl::SetItemState(itemOld, UINT(~TVIS_SELECTED), UINT(TVIS_SELECTED));
}
}
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