static void UnloadChildrenOf(SubjectVM.RowVM parent)
{
if (parent.Status == SubjectVM.ChildrenStatus.YesLoaded)
{
parent.Status = SubjectVM.ChildrenStatus.YesPlaceholder;
}
}
void RefreshRoot()
{
//collect items from cache
var cachedRoots = Globals.BoxCache.GetTopNotes().ToArray();
//hold on to old row VMs for reuse
var oldRowVMs = VM.RootRows.ToArray();
VM.RootRows.Clear();
var newRows = new List <SubjectVM.RowVM>();
//quit if empty
if (cachedRoots.Length == 0)
{
return;
}
//rebuild list in current order using old row VMs
foreach (var cachedBox in cachedRoots)
{
var rootVM = oldRowVMs.FirstOrDefault(r => r.Persistent.RowId == cachedBox.RowId);
if (rootVM == null || rootVM.Persistent != cachedBox)
{
rootVM = new SubjectVM.RowVM(cachedBox, null);
}
newRows.Add(rootVM);
rootVM.Touch();
}
VM.RootRows.AddRange(newRows);
//handle placeholders under those nodes that have actual children
var rootIds = cachedRoots.Select(r => r.RowId).ToArray();
var withChildren = Globals.UI.BoxesWithChildren(rootIds, true);
foreach (var vm in VM.RootRows)
{
bool hasChildren = withChildren.Contains(vm.Persistent.RowId);
if (vm.Status == SubjectVM.ChildrenStatus.No && hasChildren)
{
vm.Status = SubjectVM.ChildrenStatus.YesPlaceholder;
}
else if (!hasChildren)
{
vm.Status = SubjectVM.ChildrenStatus.No;
}
}
}
/// <summary>
/// Load children and return true if any found
/// </summary>
static bool LoadChildrenOf(SubjectVM.RowVM parent)
{
var children = Globals.UI.LoadBoxesByParent(parent.Persistent.RowId, true);
parent.Status = children.Any() ? SubjectVM.ChildrenStatus.YesLoaded : SubjectVM.ChildrenStatus.No;
parent.Children.AddRange(children.Select(r => new SubjectVM.RowVM(r, parent)));
var ids = children.Select(r => r.RowId).ToArray();
var withChildren = Globals.UI.BoxesWithChildren(ids, true);
foreach (var id in withChildren)
{
var child = parent.Children.FirstOrDefault(r => r.Persistent.RowId == id);
if (child != null)
{
child.Status = SubjectVM.ChildrenStatus.YesPlaceholder;
}
}
return(parent.Status == SubjectVM.ChildrenStatus.YesLoaded);
}
/// <summary>
/// Recursively refresh rowVM's children if it contains the given box; return true if this or any descendant level
/// found the box
/// </summary>
/// <returns></returns>
bool RefreshChildrenOf(SubjectVM.RowVM rowVM, BoxEditingPool.Item changes)
{
long thisId = rowVM.Persistent.RowId;
bool reloadNeeded = false;
if (rowVM.Status == SubjectVM.ChildrenStatus.No)
{
reloadNeeded = changes.NewParentId == thisId;
}
else if (rowVM.Status == SubjectVM.ChildrenStatus.YesLoaded)
{
reloadNeeded = (changes.IsParentageChanged || changes.IsTitleChanged || changes.NewDoneDate != changes.OldDoneDate) &&
(changes.OldParentId == thisId || changes.NewParentId == thisId);
}
else if (rowVM.Status == SubjectVM.ChildrenStatus.YesPlaceholder)
{
reloadNeeded = false; //was: changes.IsParentageChanged && (changes.OldParentId == thisId || changes.NewParentId == thisId);
}
//found it, so reload (which collapses children)
if (reloadNeeded)
{
LoadChildrenOf(rowVM);
return(true);
}
//didn't find it, so recurse children and exit when found
if (rowVM.Status == SubjectVM.ChildrenStatus.YesLoaded)
{
foreach (var c in rowVM.Children)
{
if (RefreshChildrenOf(c, changes))
{
return(true);
}
}
}
return(false);
}
