partial void OnHandlerChangingPartial(HandlerChangingEventArgs args)
{
if (args.OldHandler != null && args.NewHandler == null)
{
DisconnectHandler();
}
}
private protected override void OnHandlerChangingCore(HandlerChangingEventArgs args)
{
_gestureManager?.Dispose();
_gestureManager = null;
base.OnHandlerChangingCore(args);
}
partial void OnHandlerChangingPartial(HandlerChangingEventArgs args)
{
_connectedToHandler = false;
if (args.OldHandler != null && args.NewHandler == null)
{
OnHandlerDisconnected(args.OldHandler.PlatformView as FrameworkElement);
}
}
partial void OnHandlerChangingPartial(HandlerChangingEventArgs args)
{
_callConnectHandler = false;
if (args.OldHandler != null && args.NewHandler == null)
{
OnDisconnectHandler(args.OldHandler.PlatformView as FrameworkElement);
}
else if (args.OldHandler == null && args.NewHandler != null)
{
_callConnectHandler = true;
}
}
private protected override void OnHandlerChangingCore(HandlerChangingEventArgs args)
{
base.OnHandlerChangingCore(args);
if (args.NewHandler == null)
{
PagesChanged -= OnPagesChanged;
WireUnwireChanges(false);
}
else if (args.OldHandler == null)
{
PagesChanged += OnPagesChanged;
WireUnwireChanges(true);
}
OnHandlerChangingPartial(args);
void OnPagesChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
WireUnwireChanges(false);
Handler?.UpdateValue(TabbedPage.ItemsSourceProperty.PropertyName);
WireUnwireChanges(true);
}
void WireUnwireChanges(bool wire)
{
foreach (var page in Children)
{
if (wire)
{
page.PropertyChanged += OnPagePropertyChanged;
}
else
{
page.PropertyChanged -= OnPagePropertyChanged;
}
}
}
void OnPagePropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (e.PropertyName == Page.TitleProperty.PropertyName)
{
Handler?.UpdateValue(TabbedPage.ItemsSourceProperty.PropertyName);
}
}
}
private protected override void OnHandlerChangingCore(HandlerChangingEventArgs args)
{
base.OnHandlerChangingCore(args);
if (Device.Idiom == TargetIdiom.Phone)
{
return;
}
if (args.NewHandler == null)
{
DeviceDisplay.MainDisplayInfoChanged -= OnMainDisplayInfoChanged;
}
else if (args.OldHandler == null)
{
DeviceDisplay.MainDisplayInfoChanged += OnMainDisplayInfoChanged;
}
}
partial void OnHandlerChangingPartial(HandlerChangingEventArgs args);
