private void ReplaceChildren(ObservableCollection <AppViewModel> freshApps)
{
UiDispatcherService.RunOnUiThread(() => Children.Clear());
foreach (TreeViewItemViewModel avm in freshApps)
{
UiDispatcherService.RunOnUiThread(() => Children.Add(avm));
}
if (Children.Count == 0)
{
UiDispatcherService.RunOnUiThread(() => Children.Add(EmptyPlaceholder));
}
else if (Children.Count > 1 && HasEmptyPlaceholder)
{
UiDispatcherService.RunOnUiThread(() => Children.Remove(EmptyPlaceholder));
}
}
/// <summary>
/// add any ovms to cfivm.Children which are in currentOrgs but not in cfivm.Children.
/// </summary>
/// <param name="cfivm"></param>
/// <param name="freshOrgs"></param>
private void AddNewOrgs(ObservableCollection <OrgViewModel> freshOrgs)
{
foreach (OrgViewModel newOVM in freshOrgs)
{
if (newOVM != null)
{
bool orgInChildren = Children.Any(ovm =>
{
var oldOVM = ovm as OrgViewModel;
return(oldOVM != null && oldOVM.Org.OrgId == newOVM.Org.OrgId);
});
if (!orgInChildren)
{
UiDispatcherService.RunOnUiThread(() => Children.Add(newOVM));
}
}
}
}
/// <summary>
/// Add any svms to Children which are in freshSpaces but not in Children.
/// </summary>
/// <param name="ovm"></param>
/// <param name="freshSpaces"></param>
private void AddNewSpaces(ObservableCollection <SpaceViewModel> freshSpaces)
{
foreach (SpaceViewModel newSVM in freshSpaces)
{
if (newSVM != null)
{
bool spaceInChildren = Children.Any(svm =>
{
var oldSVM = svm as SpaceViewModel;
return(oldSVM != null && oldSVM.Space.SpaceId == newSVM.Space.SpaceId);
});
if (!spaceInChildren)
{
UiDispatcherService.RunOnUiThread(() => Children.Add(newSVM));
}
}
}
}
/// <summary>
/// remove all ovms from cfivm.Children which don't appear in currentOrgs.
/// </summary>
/// <param name="cfivm"></param>
/// <param name="freshOrgs"></param>
private void RemoveNonexistentOrgs(ObservableCollection <OrgViewModel> freshOrgs)
{
var orgsToRemove = new ObservableCollection <OrgViewModel>();
foreach (TreeViewItemViewModel priorChild in Children)
{
if (priorChild is OrgViewModel oldOVM)
{
bool orgStillExists = freshOrgs.Any(ovm => ovm != null && ovm.Org.OrgId == oldOVM.Org.OrgId);
if (!orgStillExists)
{
orgsToRemove.Add(oldOVM);
}
}
}
foreach (OrgViewModel ovm in orgsToRemove)
{
UiDispatcherService.RunOnUiThread(() => Children.Remove(ovm));
}
}
/// <summary>
/// Remove all svms from Children which don't appear in freshSpaces.
/// </summary>
/// <param name="ovm"></param>
/// <param name="freshSpaces"></param>
private void RemoveNonexistentSpaces(ObservableCollection <SpaceViewModel> freshSpaces)
{
var spacesToRemove = new ObservableCollection <SpaceViewModel>();
foreach (TreeViewItemViewModel priorChild in Children)
{
if (priorChild is SpaceViewModel oldSVM)
{
bool spaceStillExists = freshSpaces.Any(svm => svm != null && svm.Space.SpaceId == oldSVM.Space.SpaceId);
if (!spaceStillExists)
{
spacesToRemove.Add(oldSVM);
}
}
}
foreach (SpaceViewModel svm in spacesToRemove)
{
UiDispatcherService.RunOnUiThread(() => Children.Remove(svm));
}
}
public override async Task RefreshChildren()
{
if (!IsRefreshing)
{
IsRefreshing = true;
var freshOrgs = await FetchChildren();
RemoveNonexistentOrgs(freshOrgs);
AddNewOrgs(freshOrgs);
if (Children.Count == 0)
{
UiDispatcherService.RunOnUiThread(() => Children.Add(EmptyPlaceholder));
}
else if (Children.Count > 1 && HasEmptyPlaceholder)
{
UiDispatcherService.RunOnUiThread(() => Children.Remove(EmptyPlaceholder));
}
IsRefreshing = false;
}
}