protected override void KeyDownHandler(Event e)
{
if (!Enabled)
{
return;
}
KeyboardEvent ke = (KeyboardEvent)e;
if (!DropDownController.ProcessKeyDown(e))
{
var navigationKey = ke.KeyCode;
var navigationUnit = NavigationUnitUtil.GetNavigationUnit(navigationKey);
/*if (findKey(ke.charCode))
* {
* event.preventDefault();
* return;
* }*/
if (!NavigationUnitUtil.IsNavigationUnit(navigationKey))
{
return;
}
var proposedNewIndex = NO_SELECTION;
int currentIndex;
if (IsDropDownOpen)
{
// Normalize the proposed index for getNavigationDestinationIndex
currentIndex = UserProposedSelectedIndex < NO_SELECTION ? NO_SELECTION : UserProposedSelectedIndex;
proposedNewIndex = Layout.GetNavigationDestinationIndex(currentIndex, navigationUnit, ArrowKeysWrapFocus);
if (proposedNewIndex != NO_SELECTION)
{
ChangeHighlightedSelection(proposedNewIndex);
e.PreventDefault();
}
}
else if (null != DataProvider)
{
var maxIndex = DataProvider.Length - 1;
// Normalize the proposed index for getNavigationDestinationIndex
currentIndex = CaretIndex < NO_SELECTION ? NO_SELECTION : CaretIndex;
switch (navigationUnit)
{
case NavigationUnit.Up:
{
if (ArrowKeysWrapFocus &&
(currentIndex == 0 ||
currentIndex == NO_SELECTION ||
currentIndex == CUSTOM_SELECTED_ITEM))
{
proposedNewIndex = maxIndex;
}
else
{
proposedNewIndex = currentIndex - 1;
}
e.PreventDefault();
break;
}
case NavigationUnit.Down:
{
if (ArrowKeysWrapFocus &&
(currentIndex == maxIndex ||
currentIndex == NO_SELECTION ||
currentIndex == CUSTOM_SELECTED_ITEM))
{
proposedNewIndex = 0;
}
else
{
proposedNewIndex = currentIndex + 1;
}
e.PreventDefault();
break;
}
case NavigationUnit.PageUp:
{
proposedNewIndex = currentIndex == NO_SELECTION ?
NO_SELECTION : Math.Max(currentIndex - PAGE_SIZE, 0);
e.PreventDefault();
break;
}
case NavigationUnit.PageDown:
{
proposedNewIndex = currentIndex == NO_SELECTION ?
PAGE_SIZE : (currentIndex + PAGE_SIZE);
e.PreventDefault();
break;
}
case NavigationUnit.Home:
{
proposedNewIndex = 0;
e.PreventDefault();
break;
}
case NavigationUnit.End:
{
proposedNewIndex = maxIndex;
e.PreventDefault();
break;
}
}
proposedNewIndex = Math.Min(proposedNewIndex, maxIndex);
if (proposedNewIndex >= 0)
{
SetSelectedIndex(proposedNewIndex, true);
}
}
}
else
{
e.PreventDefault();
}
}
