protected override void OnAttachedTo(ContentPage bindable)
{
ListView = bindable.FindByName <SfListView>("listView");
button = bindable.FindByName <Button>("Button");
scrollview = ListView.GetScrollView();
button.Clicked += Button_Clicked;
base.OnAttachedTo(bindable);
}
protected override void OnAttachedTo(BindableObject bindable)
{
listView = bindable as SfListView;
searchBar = (bindable as SfListView).FindByName <SearchBar>("filterText");
searchBar.TextChanged += SearchBar_TextChanged;
scrollview = listView.GetScrollView();
base.OnAttachedTo(bindable);
}
protected override void OnDetachingFrom(SfListView bindable)
{
base.OnDetachingFrom(bindable);
scrollview.Scrolled -= Scrollview_Scrolled;
container = null;
scrollview = null;
listview = null;
}
protected override void OnAttachedTo(SfListView bindable)
{
base.OnAttachedTo(bindable);
listview = bindable as SfListView;
viewModel = new ViewModel();
listview.BindingContext = viewModel;
container = listview.GetVisualContainer();
scrollview = listview.GetScrollView();
scrollview.Scrolled += Scrollview_Scrolled;
}
private void SetScrollStatus(ExtendedScrollView view)
{
try
{
this.ScrollEnabled = view.ScrollingEnabled;
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
}
}
public SettingTabView()
{
InitializeComponent();
BindingContext = viewModel;
UpdateSettingItem();
viewModel.heightImages = 150;
this.listView.DragDropController.UpdateSource = true;
container = listView.GetVisualContainer();
scrollview = listView.GetScrollView();
scrollview.Scrolled += Scrollview_Scrolled;
}
private void SetScrollBarStatus(ExtendedScrollView view)
{
try
{
this.ShowsVerticalScrollIndicator = view.ScrollBarEnabled;
this.ShowsHorizontalScrollIndicator = view.ScrollBarEnabled;
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ExtendedScrollViewPage"/> class.
/// </summary>
public ExtendedScrollViewPage()
{
InitializeComponent();
var container = new StackLayout()
{
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand
};
var buttonToScroll = new Button()
{
Text = "Scroll to end"
};
container.Children.Add(buttonToScroll);
for (var i = 0; i < 10; i++)
{
container.Children.Add(new Image
{
Aspect = Aspect.AspectFill,
Source = ImageSource.FromUri(new Uri("http://www.stockvault.net/data/2011/05/31/124348/small.jpg")),
HeightRequest = IMAGE_HEIGHT
});
}
var sv = new ExtendedScrollView
{
Content = container,
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand
};
sv.Scrolled += async(arg1, arg2) =>
{
if (!(arg2.Y > sv.Bounds.Height) || _displayAlert)
{
return;
}
_displayAlert = true;
await DisplayAlert("Scroll event", "User scrolled pass bounds", "Ok", "cancel");
};
buttonToScroll.Clicked += (sender, e) =>
{
sv.Position = new Point(sv.Position.X, sv.ContentSize.Height - IMAGE_HEIGHT);
};
Content = sv;
}
protected override void OnElementChanged(VisualElementChangedEventArgs e)
{
base.OnElementChanged(e);
this.Scrolled += (sender, ev) => {
ExtendedScrollView sv = (ExtendedScrollView)Element;
sv.UpdateBounds(this.Bounds.ToRectangle());
};
if (e.OldElement != null)
{
e.OldElement.PropertyChanged -= OnElementPropertyChanged;
}
e.NewElement.PropertyChanged += OnElementPropertyChanged;
}
protected void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == ExtendedScrollView.PositionProperty.PropertyName)
{
ExtendedScrollView sv = (ExtendedScrollView)Element;
Point pt = sv.Position;
if (System.Math.Abs(this.Bounds.Location.Y - pt.Y) < EPSILON &&
System.Math.Abs(this.Bounds.Location.X - pt.X) < EPSILON)
{
return;
}
this.ScrollRectToVisible(
new RectangleF((float)pt.X, (float)pt.Y, Bounds.Width, Bounds.Height), sv.AnimateScroll);
}
}
private void rightImage_BindingContextChanged(object sender, EventArgs e)
{
Image rightImage = sender as Image;
Grid grid1 = (Grid)rightImage.Parent;
Grid grid2 = (Grid)grid1.Parent;
Grid grid3 = (Grid)grid2.Parent;
SwipeView swipeView = (SwipeView)grid3.Parent;
VisualContainer visualContainer = (VisualContainer)swipeView.Parent;
ExtendedScrollView extendedScrollView = (ExtendedScrollView)visualContainer.Parent;
SfListView sfListView = (SfListView)extendedScrollView.Parent;
Collection <Lado> Source = (Collection <Lado>)sfListView.ItemsSource;
Lado item = Source[itemIndex];
DeleteEvent evento = new DeleteEvent(item);
evento.executeEvent += Evento_executeEvent;
(rightImage.Parent as View).GestureRecognizers.Clear();
(rightImage.Parent as View).GestureRecognizers.Add(new TapGestureRecognizer()
{
Command = evento
});
rightImage.Source = "Delete.png";
}
