private void RebuildMenu(LinkGroupCollection groups)
{
this.groupMap.Clear();
if (groups != null)
{
// fill the group map based on group key
foreach (var group in groups)
{
var groupKey = GetGroupKey(group);
ReadOnlyLinkGroupCollection groupCollection;
if (!this.groupMap.TryGetValue(groupKey, out groupCollection))
{
// create a new collection for this group key
groupCollection = new ReadOnlyLinkGroupCollection(new LinkGroupCollection());
this.groupMap.Add(groupKey, groupCollection);
}
// add the group
groupCollection.List.Add(group);
}
}
// update current selection
UpdateSelection();
}
private void UpdateSelection()
{
LinkGroup selectedGroup = null;
Link selectedLink = null;
Uri sourceNoFragment = NavigationHelper.RemoveFragment(this.SelectedSource);
if (this.LinkGroups != null)
{
// find the current select group and link based on the selected source
var linkInfo = (from g in this.LinkGroups
from l in g.Links
where l.Source == sourceNoFragment
select new {
Group = g,
Link = l
}).FirstOrDefault();
if (linkInfo != null)
{
selectedGroup = linkInfo.Group;
selectedLink = linkInfo.Link;
}
else
{
// could not find link and group based on selected source, fall back to selected link group
selectedGroup = this.SelectedLinkGroup;
// if selected group doesn't exist in available groups, select first group
if (!this.LinkGroups.Any(g => g == selectedGroup))
{
selectedGroup = this.LinkGroups.FirstOrDefault();
}
}
}
ReadOnlyLinkGroupCollection groups = null;
if (selectedGroup != null)
{
// ensure group itself maintains the selected link
selectedGroup.SelectedLink = selectedLink;
// find the collection this group belongs to
var groupKey = GetGroupKey(selectedGroup);
this.groupMap.TryGetValue(groupKey, out groups);
}
this.isSelecting = true;
// update selection
SetValue(VisibleLinkGroupsPropertyKey, groups);
SetCurrentValue(SelectedLinkGroupProperty, selectedGroup);
SetCurrentValue(SelectedLinkProperty, selectedLink);
this.isSelecting = false;
}
