HTREEITEM CTreeCtrlEx::GetPrevSelectedItem( HTREEITEM hItem )
{
for ( hItem = GetPrevVisibleItem( hItem ); hItem!=NULL; hItem = GetPrevVisibleItem( hItem ) )
if ( GetItemState( hItem, TVIS_SELECTED ) & TVIS_SELECTED )
return hItem;
return NULL;
}
void CLibraryFolderCtrl::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
if ( ( nChar == VK_UP || nChar == VK_DOWN ) && ( GetKeyState( VK_SHIFT ) & 0x8000 ) && m_bMultiSelect )
{
if ( ! m_hFirstSelected )
{
m_hFirstSelected = GetFirstSelectedItem();
ClearSelection( m_hFirstSelected );
}
HTREEITEM hItemPrevSel = GetSelectedItem();
HTREEITEM hItemNext;
if ( nChar == VK_UP )
hItemNext = GetPrevVisibleItem( hItemPrevSel );
else
hItemNext = GetNextVisibleItem( hItemPrevSel );
if ( hItemNext )
{
BOOL bReselect = ! ( GetItemState( hItemNext, TVIS_SELECTED ) & TVIS_SELECTED );
SelectItem( hItemNext );
if ( bReselect ) SetItemState( hItemPrevSel, TVIS_SELECTED, TVIS_SELECTED );
}
NotifySelectionChanged();
return;
}
else if ( nChar >= VK_SPACE )
{
m_hFirstSelected = NULL;
ClearSelection();
}
else if ( nChar == 'A' && ( GetAsyncKeyState( VK_CONTROL ) & 0x8000 ) && m_bMultiSelect )
{
BOOL bChanged = FALSE;
for ( HTREEITEM hItem = GetRootItem() ; hItem != NULL ; hItem = GetNextItem( hItem, TVGN_NEXTVISIBLE ) )
{
if ( ( GetItemState( hItem, TVIS_SELECTED ) & TVIS_SELECTED ) == 0 )
{
SetItemState( hItem, TVIS_SELECTED, TVIS_SELECTED );
bChanged = TRUE;
}
}
if ( bChanged ) NotifySelectionChanged();
return;
}
CTreeCtrl::OnKeyDown( nChar, nRepCnt, nFlags );
}
void CTreeCtrlFolder::SelectNextItem(BOOL selectNext)
{
HTREEITEM item = GetSelectedItem();
if (selectNext)
item = GetNextVisibleItem(item);
else
item = GetPrevVisibleItem(item);
if (item != NULL)
{ SelectItem(item);
Inform();
}
}
HTREEITEM CEditTreeCtrl::GetDropTarget(EDropHint & hint) {
ASSERT(m_pDragData != 0);
CPoint pt;
GetCursorPos(&pt);
ScreenToClient(&pt);
UINT flags;
HTREEITEM hDrop = HitTest(pt, &flags);
hint = GetDropHint(flags);
m_pDragData->SetDropTarget(hDrop);
if(hDrop) {
m_pDragData->DragLeave(); // allow updates
SelectDropTarget(hDrop);
if(m_pDragData->CheckExpand(hDrop))
Expand(hDrop, TVE_EXPAND);
// Make sure the surrounding items are visible, too
// This will scroll the tree if necessary.
HTREEITEM hPrev = GetPrevVisibleItem(hDrop);
if(hPrev)
EnsureVisible(hPrev);
HTREEITEM hNext = GetNextVisibleItem(hDrop);
if(hNext)
EnsureVisible(hNext);
// if the drop target is a descendent of the dragged item, then
// disallow dropping the item here...
if(IsAncestor(m_pDragData->GetDragItem(), hDrop) || !CanDropItem(m_pDragData->GetDragItem(), hDrop, hint))
hint = DROP_NODROP;
m_pDragData->DragEnter(pt);
} else if(hint != DROP_NODROP && !CanDropItem(m_pDragData->GetDragItem(), hDrop, hint))
hint = DROP_NODROP;
return hDrop;
}
BOOL CMultiSelTreeCtrl::ScrollTree( int linesToScroll )
{
BOOL moved= FALSE;
HTREEITEM firstItem;
HTREEITEM currentItem;
if( linesToScroll < 0 )
{
// Scrolling down
firstItem=GetFirstVisibleItem();
long visible=GetVisibleCount();
int count=0;
for(int i=0; i < visible - linesToScroll; i++)
{
currentItem= firstItem;
firstItem= GetNextVisibleItem(currentItem);
if( firstItem == NULL )
{
firstItem= currentItem;
break;
}
else
count++;
}
if( count >= visible )
moved= TRUE;
}
else if( linesToScroll > 0 )
{
// Scrolling up
firstItem=GetFirstVisibleItem();
for(int i=0; i < linesToScroll; i++)
{
currentItem= firstItem;
firstItem= GetPrevVisibleItem(currentItem);
if( firstItem == NULL )
{
firstItem= currentItem;
break;
}
else
moved= TRUE;
}
}
else
{
ASSERT(0);
return moved;
}
// Turn on redraws
if(moved)
{
EnsureVisible(firstItem);
// Redraw w/out erase to avoid slow video update
RedrawWindow( NULL, NULL, RDW_UPDATENOW );
}
return moved;
}
void CTreeCtrlEx::OnKeyDown( UINT nChar, UINT nRepCnt, UINT nFlags )
{
CWnd* pWnd = GetParent();
if ( nChar==VK_NEXT || nChar==VK_PRIOR )
{
if ( !( GetKeyState( VK_SHIFT )&0x8000 ) )
{
// User pressed Pg key without holding 'Shift':
// Clear multiple selection (if multiple) and let base class do
// normal selection work!
if ( GetSelectedCount()>1 )
ClearSelection( TRUE );
CTreeCtrl::OnKeyDown( nChar, nRepCnt, nFlags );
m_hFirstSelectedItem = GetSelectedItem();
return;
}
// Flag signaling that selection process is NOT complete.
// (Will prohibit TVN_SELCHANGED from being sent to parent)
m_bSelectionComplete = FALSE;
// Let base class select the item
CTreeCtrl::OnKeyDown( nChar, nRepCnt, nFlags );
HTREEITEM hSelectedItem = GetSelectedItem();
// Then select items in between
SelectItems( m_hFirstSelectedItem, hSelectedItem );
// Selection process is now complete. Since we have 'eaten' the TVN_SELCHANGED
// notification provided by Windows' treectrl, we must now produce one ourselves,
// so that our parent gets to know about the change of selection.
m_bSelectionComplete = TRUE;
if (pWnd)
{
NM_TREEVIEW tv;
memset(&tv.itemOld, 0, sizeof(tv.itemOld));
tv.hdr.hwndFrom = GetSafeHwnd();
tv.hdr.idFrom = GetWindowLong(GetSafeHwnd(), GWL_ID);
tv.hdr.code = TVN_SELCHANGED;
tv.itemNew.hItem = hSelectedItem;
tv.itemNew.state = GetItemState(hSelectedItem, 0xffffffff);
tv.itemNew.lParam = GetItemData(hSelectedItem);
tv.itemNew.mask = TVIF_HANDLE|TVIF_STATE|TVIF_PARAM;
tv.action = TVC_UNKNOWN;
pWnd->SendMessage(WM_NOTIFY, tv.hdr.idFrom, (LPARAM)&tv);
}
}
else if ( nChar==VK_UP || nChar==VK_DOWN )
{
// Find which item is currently selected
HTREEITEM hSelectedItem = GetSelectedItem();
HTREEITEM hNextItem;
if ( nChar==VK_UP )
hNextItem = GetPrevVisibleItem( hSelectedItem );
else
hNextItem = GetNextVisibleItem( hSelectedItem );
if ( !( GetKeyState( VK_SHIFT )&0x8000 ) )
{
// User pressed arrow key without holding 'Shift':
// Clear multiple selection (if multiple) and let base class do
// normal selection work!
if ( GetSelectedCount()>1 )
ClearSelection( TRUE );
if ( hNextItem )
CTreeCtrl::OnKeyDown( nChar, nRepCnt, nFlags );
m_hFirstSelectedItem = GetSelectedItem();
return;
}
if ( hNextItem )
{
// Flag signaling that selection process is NOT complete.
// (Will prohibit TVN_SELCHANGED from being sent to parent)
m_bSelectionComplete = FALSE;
// If the next item is already selected, we assume user is
// "moving back" in the selection, and thus we should clear
// selection on the previous one
BOOL bSelect = !( GetItemState( hNextItem, TVIS_SELECTED ) & TVIS_SELECTED );
// Select the next item (this will also deselect the previous one!)
SelectItem( hNextItem );
// Now, re-select the previously selected item
if ( bSelect || ( !( GetItemState( hSelectedItem, TVIS_SELECTED ) & TVIS_SELECTED ) ) )
SelectItems( m_hFirstSelectedItem, hNextItem );
// Selection process is now complete. Since we have 'eaten' the TVN_SELCHANGED
// notification provided by Windows' treectrl, we must now produce one ourselves,
// so that our parent gets to know about the change of selection.
m_bSelectionComplete = TRUE;
if (pWnd)
{
NM_TREEVIEW tv;
memset(&tv.itemOld, 0, sizeof(tv.itemOld));
tv.hdr.hwndFrom = GetSafeHwnd();
tv.hdr.idFrom = GetWindowLong(GetSafeHwnd(), GWL_ID);
tv.hdr.code = TVN_SELCHANGED;
tv.itemNew.hItem = hNextItem;
tv.itemNew.state = GetItemState(hNextItem, 0xffffffff);
tv.itemNew.lParam = GetItemData(hNextItem);
tv.itemNew.mask = TVIF_HANDLE|TVIF_STATE|TVIF_PARAM;
tv.action = TVC_UNKNOWN;
pWnd->SendMessage(WM_NOTIFY, tv.hdr.idFrom, (LPARAM)&tv);
}
}
// Since the base class' OnKeyDown() isn't called in this case,
// we must provide our own TVN_KEYDOWN notification to the parent
CWnd* pWnd = GetParent();
if ( pWnd )
{
NMTVKEYDOWN tvk;
tvk.hdr.hwndFrom = GetSafeHwnd();
tvk.hdr.idFrom = GetWindowLong( GetSafeHwnd(), GWL_ID );
tvk.hdr.code = TVN_KEYDOWN;
tvk.wVKey = nChar;
tvk.flags = 0;
pWnd->SendMessage( WM_NOTIFY, tvk.hdr.idFrom, (LPARAM)&tvk );
}
}
else
// Behave normally
CTreeCtrl::OnKeyDown( nChar, nRepCnt, nFlags );
}
