void OnToolbarItemSelected(object sender, EToolbarItemEventArgs e)
{
if (_toolbar.SelectedItem == null || _isResettingToolbarItems)
{
return;
}
if (_isUpdateByCurrentPage || _isUpdateByScroller)
{
return;
}
_isUpdateByToolbar = true;
var oldPage = Element.CurrentPage;
var newPage = _itemToItemPage[_toolbar.SelectedItem];
if (oldPage != newPage)
{
oldPage?.SendDisappearing();
Element.CurrentPage = newPage;
newPage?.SendAppearing();
int index = MultiPage <Page> .GetIndex(newPage);
_scroller.ScrollTo(index, 0, true);
Element.UpdateFocusTreePolicy();
}
_isUpdateByToolbar = false;
}
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;
}
void OnInnerLayoutUpdate()
{
if (!_isInitialized)
{
return;
}
int baseX = _innerBox.Geometry.X;
ERect bound = _scroller.Geometry;
int index = 0;
foreach (var page in Element.Children)
{
var nativeView = Platform.GetRenderer(page).NativeView;
bound.X = baseX + index * bound.Width;
nativeView.Geometry = bound;
index++;
}
_innerBox.MinimumWidth = Element.Children.Count * bound.Width;
if (_toolbar.SelectedItem == null)
{
return;
}
int currentPage = MultiPage <Page> .GetIndex(_itemToItemPage[_toolbar.SelectedItem]);
_scroller.ScrollTo(currentPage, 0, false);
}
/*
* public override void WillRotate (UIInterfaceOrientation toInterfaceOrientation, double duration)
* {
* this.ignoreNativeScrolling = true;
* }
*
* public override void DidRotate (UIInterfaceOrientation fromInterfaceOrientation)
* {
* this.ignoreNativeScrolling = false;
* }
*/
private void UpdateCurrentPage(bool animated = true)
{
ContentPage currentPage = this.Carousel.CurrentPage;
if (currentPage == null)
{
return;
}
this.ScrollToPage(MultiPage <ContentPage> .GetIndex(currentPage), animated);
}
private static void TabbedPageOnCurrentPageChanged(object sender, EventArgs e)
{
if (sender is SJTabbedPage sJTabbedPage && sJTabbedPage.IsEnabled)
{
var currentIndex = MultiPage <Page> .GetIndex(sJTabbedPage.CurrentPage);
sJTabbedPage.SelectedIndex = currentIndex;
var command = GetCurrentPageChangedCommand(sJTabbedPage);
if (command != null && command.CanExecute(currentIndex))
{
command.Execute(currentIndex);
}
}
}
void SelectedNextTab(int direction)
{
int nextIndex = MultiPage <Page> .GetIndex(Tabbed.CurrentPage) + direction;
if (nextIndex < 0 || nextIndex >= Tabbed.Children.Count)
{
return;
}
var nextPage = Tabbed.Children[nextIndex];
UIView.Transition(
Platform.GetRenderer(Tabbed.CurrentPage).NativeView,
Platform.GetRenderer(nextPage).NativeView,
0.05,
UIViewAnimationOptions.TransitionCrossDissolve,
null);
Tabbed.CurrentPage = nextPage;
}
private void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
this.ignoreNativeScrolling = true;
int num1 = (int)NotifyCollectionChangedEventArgsExtensions.Apply(e, (Action <object, int, bool>)((o, i, c) => this.InsertPage((ContentPage)o, i)), (Action <object, int>)((o, i) => this.RemovePage((ContentPage)o, i)), new Action(this.Reset));
this.PositionChildren();
this.ignoreNativeScrolling = false;
int num2 = 4;
if (num1 != num2)
{
return;
}
int index = this.Carousel.CurrentPage != null ? MultiPage <ContentPage> .GetIndex(this.Carousel.CurrentPage) : 0;
if (index < 0)
{
index = 0;
}
this.ScrollToPage(index, true);
}
void OnToolbarItemSelected(object sender, EToolbarItemEventArgs e)
{
if (_toolbar.SelectedItem == null || _isResettingToolbarItems)
{
return;
}
var oldPage = Element.CurrentPage;
var newPage = _itemToItemPage[_toolbar.SelectedItem];
if (oldPage == newPage)
{
return;
}
oldPage?.SendDisappearing();
Element.CurrentPage = newPage;
newPage?.SendAppearing();
int index = MultiPage <Page> .GetIndex(newPage);
_scroller.ScrollTo(index, 0, true);
}