private NavigationViewItem GetParentNavigationViewItemForContainer(NavigationViewItemBase nvib)
{
//TODO: This scenario does not find parent items when in a flyout, which causes problems if item if first loaded
//straight in the flyout. Fix.This logic can be merged with the 'GetIndexPathForContainer' logic below.
var parent = GetParentItemsRepeaterForContainer(nvib);
if (!IsRootItemsRepeater(parent))
{
return(parent.FindAncestorOfType <NavigationViewItem>());
}
return(null);
}
private ItemsRepeater GetParentRootItemsRepeaterForContainer(NavigationViewItemBase nvib)
{
var parentIR = GetParentItemsRepeaterForContainer(nvib);
while (!IsRootItemsRepeater(parentIR))
{
nvib = GetParentNavigationViewItemForContainer(nvib);
if (nvib == null)
{
return(null);
}
parentIR = GetParentItemsRepeaterForContainer(nvib);
}
return(parentIR);
}
private bool IsContainerTheSelectedItemInTheSelectionModel(NavigationViewItemBase nvib)
{
var selItem = _selectionModel.SelectedItem;
if (selItem == null)
{
return(false);
}
var selItemCont = selItem as NavigationViewItemBase;
if (selItemCont == null)
{
selItemCont = GetContainerForIndexPath(_selectionModel.SelectedIndex);
}
return(selItemCont == nvib);
}
private IndexPath GetIndexPathForContainer(NavigationViewItemBase nvib)
{
var path = new List <int>(4);
bool isInFooterMenu = false;
IControl child = nvib;
var parent = nvib.GetVisualParent();
if (parent == null)
{
return(IndexPath.CreateFromIndices(path));
}
// Search through VisualTree for a root ItemsRepeater
while (parent != null && !IsRootItemsRepeater(parent) && !IsRootGridOfFlyout(parent))
{
if (parent is ItemsRepeater ir)
{
path.Insert(0, ir.GetElementIndex(child));
}
child = (IControl)parent;
parent = parent.GetVisualParent();
}
// If the item is in a flyout, then we need to final index of its parent
if (IsRootGridOfFlyout(parent))
{
if (_lastItemExpandedIntoFlyout != null)
{
child = _lastItemExpandedIntoFlyout;
parent = IsTopNavigationView ? _topNavRepeater : _leftNavRepeater;
}
}
// If item is in one of the disconnected ItemRepeaters, account for that in IndexPath calculations
if (parent == _topNavRepeaterOverflowView)
{
// Convert index of selected item in overflow to index in datasource
var contIndex = _topNavRepeaterOverflowView.GetElementIndex(child);
var item = _topDataProvider.GetOverflowItems()[contIndex];
var indexAtRoot = _topDataProvider.IndexOf(item);
path.Insert(0, indexAtRoot);
}
else if (parent == _topNavRepeater)
{
// Convert index of selected item in overflow to index in datasource
var contIndex = _topNavRepeater.GetElementIndex(child);
var item = _topDataProvider.GetPrimaryItems()[contIndex];
var indexAtRoot = _topDataProvider.IndexOf(item);
path.Insert(0, indexAtRoot);
}
else if (parent is ItemsRepeater parentIR)
{
path.Insert(0, parentIR.GetElementIndex(child));
}
isInFooterMenu = parent == _leftNavFooterMenuRepeater || parent == _topNavFooterMenuRepeater;
path.Insert(0, isInFooterMenu ? _footerMenuBlockIndex : _mainMenuBlockIndex);
return(IndexPath.CreateFromIndices(path));
}
private ItemsRepeater GetParentItemsRepeaterForContainer(NavigationViewItemBase nvib)
{
return(nvib?.FindAncestorOfType <ItemsRepeater>());
}
private bool IsTopLevelItem(NavigationViewItemBase nvib)
{
return(IsRootItemsRepeater(GetParentItemsRepeaterForContainer(nvib)));
}