private void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
int index = e.NewStartingIndex;
for (int i = 0; i < e.NewItems.Count; i++)
{
var page = e.NewItems[i] as Page;
Widget.AddPage(index, page);
_pages.Add(new PageContainer(page, i));
index++;
}
var newPages = new List <object>();
foreach (var pc in _pages)
{
newPages.Add(pc.Page);
}
e.Apply(Page.Children, newPages);
break;
case NotifyCollectionChangedAction.Remove:
for (int i = 0; i < e.OldItems.Count; i++)
{
var page = e.OldItems[i];
Widget.RemovePage(page);
var pageContainer = _pages.FirstOrDefault(p => p.Page == page);
_pages.Remove(pageContainer);
}
var oldPages = new List <object>();
foreach (var pc in _pages)
{
oldPages.Add(pc.Page);
}
e.Apply(Page.Children, oldPages);
UpdateCurrentPage();
break;
case NotifyCollectionChangedAction.Reset:
Widget?.Reset();
UpdateSource();
break;
}
}
void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply(Element.Children, Control.Items);
// Potential performance issue, UpdateLayout () is called for every page change
Control.UpdateLayout();
}
void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply(Element.Children, Control.Items);
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
case NotifyCollectionChangedAction.Remove:
case NotifyCollectionChangedAction.Replace:
if (e.NewItems != null)
{
for (int i = 0; i < e.NewItems.Count; i++)
{
((Page)e.NewItems[i]).PropertyChanged += OnChildPagePropertyChanged;
}
}
if (e.OldItems != null)
{
for (int i = 0; i < e.OldItems.Count; i++)
{
((Page)e.OldItems[i]).PropertyChanged -= OnChildPagePropertyChanged;
}
}
break;
case NotifyCollectionChangedAction.Reset:
foreach (var page in Element.Children)
{
page.PropertyChanged += OnChildPagePropertyChanged;
}
break;
}
Control.UpdateLayout();
EnsureBarColors(e.Action);
}
void OnItemsSourceCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply(
insert: (item, _, __) => CreatePin(item),
removeAt: (item, _) => RemovePin(item),
reset: () => _pins.Clear());
}
void OnChildrenCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply((o, i, c) => SetupPage((Page)o), (o, i) => TeardownPage((Page)o), Reset);
FormsViewPager pager = _viewPager;
TabLayout tabs = _tabLayout;
((FormsFragmentPagerAdapter <Page>)pager.Adapter).CountOverride = Element.Children.Count;
pager.Adapter.NotifyDataSetChanged();
if (Element.Children.Count == 0)
{
tabs.RemoveAllTabs();
tabs.SetupWithViewPager(null);
}
else
{
tabs.SetupWithViewPager(pager);
UpdateTabIcons();
tabs.SetOnTabSelectedListener(this);
}
UpdateIgnoreContainerAreas();
}
void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply((o, i, c) => SetupPage((Page)o, i), (o, i) => TeardownPage((Page)o), Reset);
SetControllers();
UpdateChildrenOrderIndex();
SetSelectedTabViewItem();
}
private void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (this.Element != null && this.Control != null)
{
e.Apply(this.Element.Children, this.Control.Items);
}
if (this.Control != null)
{
this.Control.UpdateLayout();
}
}
public static void Apply <TFrom>(this NotifyCollectionChangedEventArgs self, IList <TFrom> from, IList <object> to)
{
self.Apply((o, i, b) => to.Insert(i, o), (o, i) => to.RemoveAt(i), () =>
{
to.Clear();
for (var i = 0; i < from.Count; i++)
{
to.Add(from[i]);
}
});
}
void OnChildrenCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply((o, i, c) => SetupPage((Page)o), (o, i) => TeardownPage((Page)o), Reset);
ViewPager2 pager = _viewPager;
var adapter = (MultiPageFragmentStateAdapter <Page>)pager.Adapter;
adapter.CountOverride = Element.Children.Count;
if (IsBottomTabPlacement)
{
BottomNavigationView bottomNavigationView = _bottomNavigationView;
adapter.NotifyDataSetChanged();
if (Element.Children.Count == 0)
{
bottomNavigationView.Menu.Clear();
}
else
{
SetupBottomNavigationView(e);
bottomNavigationView.SetOnItemSelectedListener(_listeners);
}
UpdateIgnoreContainerAreas();
}
else
{
TabLayout tabs = _tabLayout;
adapter.NotifyDataSetChanged();
if (Element.Children.Count == 0)
{
tabs.RemoveAllTabs();
tabs.SetupWithViewPager(null);
}
else
{
new TabLayoutMediator(tabs, _viewPager, _listeners)
.Attach();
UpdateTabIcons();
#pragma warning disable CS0618 // Type or member is obsolete
tabs.AddOnTabSelectedListener(_listeners);
#pragma warning restore CS0618 // Type or member is obsolete
}
UpdateIgnoreContainerAreas();
}
}
void OnChildrenCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply((o, i, c) => SetupPage((Page)o), (o, i) => TeardownPage((Page)o), Reset);
if (IsBottomTabPlacement)
{
FormsViewPager pager = _viewPager;
BottomNavigationView bottomNavigationView = _bottomNavigationView;
((FormsFragmentPagerAdapter <Page>)pager.Adapter).CountOverride = Element.Children.Count;
pager.Adapter.NotifyDataSetChanged();
if (Element.Children.Count == 0)
{
bottomNavigationView.Menu.Clear();
}
else
{
SetupBottomNavigationView(e);
bottomNavigationView.SetOnNavigationItemSelectedListener(this);
}
UpdateIgnoreContainerAreas();
}
else
{
FormsViewPager pager = _viewPager;
TabLayout tabs = _tabLayout;
((FormsFragmentPagerAdapter <Page>)pager.Adapter).CountOverride = Element.Children.Count;
pager.Adapter.NotifyDataSetChanged();
if (Element.Children.Count == 0)
{
tabs.RemoveAllTabs();
tabs.SetupWithViewPager(null);
}
else
{
tabs.SetupWithViewPager(pager);
UpdateTabIcons();
#pragma warning disable CS0618 // Type or member is obsolete
tabs.AddOnTabSelectedListener(this);
#pragma warning restore CS0618 // Type or member is obsolete
}
UpdateIgnoreContainerAreas();
}
}
void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply((o, i, c) => SetupPage((Page)o, i), (o, i) => TeardownPage((Page)o, i), Reset);
SetControllers();
UIViewController controller = null;
if (Tabbed.CurrentPage != null)
controller = GetViewController(Tabbed.CurrentPage);
if (controller != null && controller != base.SelectedViewController)
base.SelectedViewController = controller;
UpdateBarBackgroundColor();
UpdateBarTextColor();
UpdateSelectedTabColors();
}
void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply((o, i, c) => SetupPage((Page)o, i), (o, i) => TeardownPage((Page)o, i), Reset);
SetControllers();
UIViewController controller = null;
if (Tabbed.CurrentPage != null)
{
controller = GetViewController(Tabbed.CurrentPage);
}
if (controller != null && controller != base.SelectedViewController)
{
base.SelectedViewController = controller;
}
}
private void Vms_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
var collection = (IList)sender;
e.Apply(
//insert
(o, i, b) => {
Insert(o, i, b);
},
//remove
(o, i) => {
Remove(o, i);
},
//reset
() => {
Reset(collection);
});
}
void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply((o, i, c) => SetupPage((Page)o, i), (o, i) => TeardownPage((Page)o, i), Reset);
SetControllers();
UIViewController controller = null;
if (Tabbed.CurrentPage != null)
{
controller = GetViewController(Tabbed.CurrentPage);
}
if (controller != null && controller != SelectedViewController)
{
SelectedViewController = controller;
var index = ViewControllers.IndexOf(SelectedViewController);
MoveToByIndex(index);
TabBar.SelectedIndex = index;
}
}
void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
_ignoreNativeScrolling = true;
NotifyCollectionChangedAction action = e.Apply((o, i, c) => InsertPage((ContentPage)o, i), (o, i) => RemovePage((ContentPage)o, i), Reset);
PositionChildren();
_ignoreNativeScrolling = false;
if (action == NotifyCollectionChangedAction.Reset)
{
int index = Carousel.CurrentPage != null?CarouselPage.GetIndex(Carousel.CurrentPage) : 0;
if (index < 0)
{
index = 0;
}
ScrollToPage(index);
}
}
void CurrentTabbedPageChildrenChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (CurrentTabbedPage == null)
{
return;
}
_ignoreAndroidSelection = true;
e.Apply((o, index, create) => AddTab((Page)o, index), (o, index) => RemoveTab((Page)o, index), Reset);
if (CurrentTabbedPage.CurrentPage != null)
{
Page page = CurrentTabbedPage.CurrentPage;
int index = TabbedPage.GetIndex(page);
if (index >= 0 && index < CurrentTabbedPage.Children.Count)
{
ActionBar.GetTabAt(index).Select();
}
}
_ignoreAndroidSelection = false;
}
void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply(Element.Children, Control.Items);
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
case NotifyCollectionChangedAction.Remove:
case NotifyCollectionChangedAction.Replace:
if (e.NewItems != null)
{
for (int i = 0; i < e.NewItems.Count; i++)
{
(e.NewItems[i] as Page).PropertyChanged += OnChildPagePropertyChanged;
}
}
if (e.OldItems != null)
{
for (int i = 0; i < e.OldItems.Count; i++)
{
(e.OldItems[i] as Page).PropertyChanged -= OnChildPagePropertyChanged;
}
}
break;
case NotifyCollectionChangedAction.Reset:
foreach (var p in Element.Children)
{
p.PropertyChanged += OnChildPagePropertyChanged;
}
break;
default:
break;
}
// Potential performance issue, UpdateLayout () is called for every page change
Control.UpdateLayout();
}
void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply(Page.Children, _tabs.Items);
}
void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply(InsertItem, RemoveItem, Reset);
}
void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply(Element.Children, Control.ItemsSource);
}
void OnChildrenChanged(object sender, NotifyCollectionChangedEventArgs e)
{
e.Apply(Element.Children, Items);
}