private ISelectableItem FindNextVisibleSelectableItem(bool reverseOrder)
{
// We use the `lastSelection` here as that is the one the user interacted last and it feels more natural that way when navigating with keyboard
var lastSelection = m_PageManager.GetSelection().lastSelection;
var packageItem = GetPackageItem(lastSelection?.packageUniqueId);
if (packageItem == null)
{
return(null);
}
// First we try to look for the next visible options within all the versions of the current package when the list is expanded
if (packageItem.visualState.expanded)
{
m_PackageDatabase.GetPackageAndVersion(lastSelection, out var package, out var version);
var selectedVersion = version ?? package?.versions.primary;
var versionItem = packageItem.versionItems.FirstOrDefault(v => v.targetVersion == selectedVersion);
var nextVersionItem = UIUtils.FindNextSibling(versionItem, reverseOrder, UIUtils.IsElementVisible) as PackageVersionItem;
if (nextVersionItem != null)
{
return(nextVersionItem);
}
}
var nextPackageItem = FindNextVisiblePackageItem(packageItem, reverseOrder);
if (nextPackageItem == null)
{
return(null);
}
if (nextPackageItem.visualState.expanded)
{
var nextVersionItem = reverseOrder ? nextPackageItem.versionItems.LastOrDefault() : nextPackageItem.versionItems.FirstOrDefault();
if (nextVersionItem != null)
{
return(nextVersionItem);
}
}
return(nextPackageItem);
}
private static PackageItem FindNextVisiblePackageItem(PackageItem packageItem, bool reverseOrder)
{
var nextVisibleItem = UIUtils.FindNextSibling(packageItem, reverseOrder, UIUtils.IsElementVisible) as PackageItem;
if (nextVisibleItem == null)
{
Func <VisualElement, bool> nonEmptyGroup = (element) =>
{
var group = element as PackageGroup;
return(group.packageItems.Any(p => UIUtils.IsElementVisible(p)));
};
var nextGroup = UIUtils.FindNextSibling(packageItem.packageGroup, reverseOrder, nonEmptyGroup) as PackageGroup;
if (nextGroup != null)
{
nextVisibleItem = reverseOrder ? nextGroup.packageItems.LastOrDefault(p => UIUtils.IsElementVisible(p))
: nextGroup.packageItems.FirstOrDefault(p => UIUtils.IsElementVisible(p));
}
}
return(nextVisibleItem);
}