public static IDictionary <int, List <ITabStopElement> > GetTabIndexesOnParentPage(this ITabStopElement element, out int countChildrenWithTabStopWithoutThis)
{
var empty = new Dictionary <int, List <ITabStopElement> >();
countChildrenWithTabStopWithoutThis = 0;
Element parentPage = (element as Element)?.Parent;
while (parentPage != null && !(parentPage is Page))
{
parentPage = parentPage.Parent;
}
var descendantsOnPage = parentPage?.VisibleDescendants();
if (parentPage is IShellController shell)
{
descendantsOnPage = shell.GetItems();
}
if (descendantsOnPage == null)
{
return(empty);
}
var childrenWithTabStop = new List <ITabStopElement>();
foreach (var descendant in descendantsOnPage)
{
if (descendant is ITabStopElement visualElement && IsTabStop(descendant))
{
childrenWithTabStop.Add(visualElement);
}
}
countChildrenWithTabStopWithoutThis = childrenWithTabStop.Count - 1;
return(childrenWithTabStop.GroupToDictionary(c => c.TabIndex));
}
public static ITabStopElement FindNextElement(this ITabStopElement element, bool forwardDirection, IDictionary <int, List <ITabStopElement> > tabIndexes, ref int tabIndex)
{
if (!tabIndexes.TryGetValue(tabIndex, out var tabGroup))
{
return(null);
}
if (!forwardDirection)
{
// search prev element in same TabIndex group
var prevSubIndex = tabGroup.IndexOf(element) - 1;
if (prevSubIndex >= 0 && prevSubIndex < tabGroup.Count)
{
return(tabGroup[prevSubIndex]);
}
else // search prev element in prev TabIndex group
{
var smallerMax = int.MinValue;
var tabIndexesMax = int.MinValue;
foreach (var index in tabIndexes.Keys)
{
if (index < tabIndex && smallerMax < index)
{
smallerMax = index;
}
if (tabIndexesMax < index)
{
tabIndexesMax = index;
}
}
tabIndex = smallerMax != int.MinValue ? smallerMax : tabIndexesMax;
return(tabIndexes[tabIndex][0]);
}
}
else // Forward
{
// search next element in same TabIndex group
var nextSubIndex = tabGroup.IndexOf(element) + 1;
if (nextSubIndex > 0 && nextSubIndex < tabGroup.Count)
{
return(tabGroup[nextSubIndex]);
}
else // search next element in next TabIndex group
{
var biggerMin = int.MaxValue;
var tabIndexesMin = int.MaxValue;
foreach (var index in tabIndexes.Keys)
{
if (index > tabIndex && biggerMin > index)
{
biggerMin = index;
}
if (tabIndexesMin > index)
{
tabIndexesMin = index;
}
}
tabIndex = biggerMin != int.MaxValue ? biggerMin : tabIndexesMin;
return(tabIndexes[tabIndex][0]);
}
}
}
public static IDictionary <int, List <ITabStopElement> > GetTabIndexesOnParentPage(this ITabStopElement element, out int countChildrensWithTabStopWithoutThis, bool checkContainsElement = true)
{
countChildrensWithTabStopWithoutThis = 0;
Element parentPage = (element as NavigableElement).Parent;
while (parentPage != null && !(parentPage is Page))
{
parentPage = parentPage.Parent;
}
var descendantsOnPage = parentPage?.VisibleDescendants();
if (parentPage is Shell shell)
{
descendantsOnPage = shell.Items;
}
if (descendantsOnPage == null)
{
return(null);
}
var childrensWithTabStop = new List <ITabStopElement>();
foreach (var descendant in descendantsOnPage)
{
if (descendant is ITabStopElement visualElement && visualElement.IsTabStop)
{
childrensWithTabStop.Add(visualElement);
}
}
if (checkContainsElement && !childrensWithTabStop.Contains(element))
{
return(null);
}
countChildrensWithTabStopWithoutThis = childrensWithTabStop.Count - 1;
return(childrensWithTabStop.GroupToDictionary(c => c.TabIndex));
}
