private static PackageItem FindPackageItemPageUpOrPageDown(PackageItem item, bool isPageUp)
{
PackageItem targetItem = null;
if (item.packageGroup.IsExpanded)
{
targetItem = (isPageUp ? item.parent.Children().FirstOrDefault(p => !UIUtils.IsElementDisplayNone(p))
: item.parent.Children().LastOrDefault(p => !UIUtils.IsElementDisplayNone(p))) as PackageItem;
}
if (targetItem == item)
{
targetItem = null;
}
if (targetItem == null)
{
Func <VisualElement, bool> expandedNonEmptyGroup = (element) =>
{
var group = element as PackageGroup;
return(group.IsExpanded && group.packageItems.Any(p => !UIUtils.IsElementDisplayNone(p)));
};
var nextGroup = FindNextSiblingByCondition(item.packageGroup, expandedNonEmptyGroup, isPageUp) as PackageGroup;
if (nextGroup != null)
{
targetItem = (isPageUp ? nextGroup.packageItems.LastOrDefault(p => p != item && !UIUtils.IsElementDisplayNone(p))
: nextGroup.packageItems.FirstOrDefault(p => p != item && !UIUtils.IsElementDisplayNone(p))) as PackageItem;
}
}
return(targetItem);
}
private void UpdateGroups()
{
foreach (var group in Groups)
{
UIUtils.SetElementDisplay(group, group.packageItems.Any(item => !UIUtils.IsElementDisplayNone(item)));
}
}
private static PackageItem FindNextVisiblePackageItem(PackageItem item, bool reverseOrder)
{
PackageItem nextVisibleItem = null;
if (item.packageGroup.IsExpanded)
{
nextVisibleItem = FindNextSiblingByCondition(item, UIUtils.IsElementVisible, reverseOrder) as PackageItem;
}
if (nextVisibleItem == null)
{
Func <VisualElement, bool> expandedNonEmptyGroup = (element) =>
{
var group = element as PackageGroup;
return(group.IsExpanded && group.packageItems.Any(p => !UIUtils.IsElementDisplayNone(p)));
};
var nextGroup = FindNextSiblingByCondition(item.packageGroup, expandedNonEmptyGroup, reverseOrder) as PackageGroup;
if (nextGroup != null)
{
nextVisibleItem = reverseOrder ? nextGroup.packageItems.LastOrDefault(p => !UIUtils.IsElementDisplayNone(p)) : nextGroup.packageItems.FirstOrDefault(p => !UIUtils.IsElementDisplayNone(p));
}
}
return(nextVisibleItem);
}
