void EXWaitingTreeCtrl::PreExpandItem(HTREEITEM hItem)
{
if (!NeedsChildren(hItem))
{
if (WantsRefresh(hItem))
{
// delete child items before populating
DeleteChildren(hItem);
}
else
{
// doesn't want new items
m_hItemToPopulate = NULL;
return;
}
}
// if it wants new child items, go on
m_hItemToPopulate = hItem;
// fix redraw when expanded programatically
UpdateWindow();
// hide changes until it's expanded
SetRedraw(FALSE);
// add wait msg, to allow item expansion
m_hItemMsg = InsertItem(m_sWaitMsg, m_hItemToPopulate);
// zero progress
m_iItemCount = 1;
m_iItemIndex = 0;
}
void CTangramHtmlTreeExWnd::PreExpandItem(HTREEITEM hItem)
{
if(hItem)
{
m_hCurSelectedItem = hItem;
CTangramXHtmlTreeNode *pXTCD = GetItemDataStruct(hItem);
if(pXTCD->m_hWaitItemMsg)
{
m_hItemToPopulate = hItem;
// fix redraw when expanded programatically
UpdateWindow();
// hide changes until it's expanded
SetRedraw(false);
// add wait msg, to allow item expansion
m_hItemMsg = pXTCD->m_hWaitItemMsg;//InsertItem(m_sWaitMsg, m_hItemToPopulate);
// zero progress
m_iItemCount = 1;
m_iItemIndex = 0;
return;
}
}
if (!NeedsChildren(hItem))
{
if (WantsRefresh(hItem))
{
// delete child items before populating
DeleteChildren(hItem);
}
else
{
// doesn't want new items
m_hItemToPopulate = NULL;
return;
}
}
// if it wants new child items, go on
m_hItemToPopulate = hItem;
// fix redraw when expanded programatically
UpdateWindow();
// hide changes until it's expanded
SetRedraw(false);
// add wait msg, to allow item expansion
m_hItemMsg = InsertItem(m_sWaitMsg, m_hItemToPopulate);
// zero progress
m_iItemCount = 1;
m_iItemIndex = 0;
}
void EXWaitingTreeCtrl::ExpandItem(HTREEITEM hItem)
{
if (m_hItemToPopulate == NULL)
return; // just expand, doesn't want new items
ASSERT(hItem == m_hItemToPopulate); // should never fail!!!
if (m_bShowWaitMsg)
{
// display wait msg now, make sure it's visible
SetRedraw();
EnsureVisible(m_hItemMsg);
UpdateWindow();
}
// setup animation thread, call PreAnimation
StartAnimation();
// draw icon
if (m_bShowWaitMsg)
DrawUserIcon();
// delay redraw after populating
SetRedraw(FALSE);
// take a snapshot of the background
TakeSnapshot();
// del temporary item (wait msg still shown)
DeleteItem(m_hItemMsg);
// fill in with sub items
BOOL bCheckChildren = PopulateItem(hItem);
// clean up animation thread, call PostAnimation
StopAnimation();
// change parent to reflect current children number
if (hItem != TVI_ROOT)
{
TVITEM item;
item.hItem = hItem;
item.mask = TVIF_HANDLE | TVIF_CHILDREN;
item.cChildren = NeedsChildren(hItem) ? 0 : 1;
if (bCheckChildren)
SetItem(&item);
else if (item.cChildren == 0)
// restore item's plus button if no children inserted
SetItemState(hItem, 0, TVIS_EXPANDED);
}
// clean up snapshot
DestroySnapshot();
// redraw now
SetRedraw(TRUE);
}