void UpdateIsPresented()
{
// To update TabIndex order
CustomFocusManager.StartReorderTabIndex();
_mdpage.IsPresented = Element.IsPresented;
}
/// <summary>
/// Handles the process of switching between the displayed pages.
/// </summary>
/// <param name="sender">An object originating the request</param>
/// <param name="ea">Additional arguments to the event handler</param>
void OnCurrentPageChanged(object sender, EventArgs ea)
{
// To update TabIndex order
CustomFocusManager.StartReorderTabIndex();
Element.UpdateFocusTreePolicy();
if (IsChangedByScroll())
{
return;
}
if (Element.CurrentPage != Element.Children[_pageIndex])
{
var previousPageIndex = _pageIndex;
_pageIndex = Element.Children.IndexOf(Element.CurrentPage);
if (previousPageIndex != _pageIndex)
{
// notify disappearing/appearing pages and scroll to the requested page
(Element.Children[previousPageIndex] as IPageController)?.SendDisappearing();
_scroller.ScrollTo(_pageIndex, 0, false);
(Element.CurrentPage as IPageController)?.SendAppearing();
}
}
}
void OnCurrentPageChanged()
{
// To update TabIndex order
CustomFocusManager.StartReorderTabIndex();
if (_isUpdateByScroller || _isUpdateByToolbar || !_isInitialized)
{
return;
}
_isUpdateByCurrentPage = true;
Page oldPage = null;
if (_toolbar.SelectedItem != null && _itemToItemPage.ContainsKey(_toolbar.SelectedItem))
{
oldPage = _itemToItemPage[_toolbar.SelectedItem];
}
oldPage?.SendDisappearing();
Element.CurrentPage?.SendAppearing();
int index = MultiPage <Page> .GetIndex(Element.CurrentPage);
_toolbarItemList[index].IsSelected = true;
_scroller.ScrollTo(index, 0, true);
Element.UpdateFocusTreePolicy();
_isUpdateByCurrentPage = false;
}