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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Xamarin.Forms.Controls
{
public class RandomSizeCell
: TextCell
{
static readonly Random Rand = new Random (42);
public RandomSizeCell()
{
SetBinding (TextProperty, new Binding ("."));
Height = Rand.Next (25, 60);
}
}
public class ListScrollTo
: ContentPage
{
readonly List<List<string>> _items = new List<List<string>> ();
bool _animate = true;
readonly ListView _listView;
public ListScrollTo()
{
Title = "ListView ScrollTo";
for (int i = 0; i < 10; i++) {
List<string> subItems = new List<string> ();
for (int x = 0; x < 10; x++) {
subItems.Add (((i * 10) + x + 1).ToString());
}
_items.Add (subItems);
}
_listView = new ListView {
Header = "Fooooo",
Footer = "Baaaaar",
ItemsSource = _items,
IsGroupingEnabled = true,
GroupDisplayBinding = new Binding ("[0]"),
GroupShortNameBinding = new Binding("[0]"),
HasUnevenRows = true,
ItemTemplate = new DataTemplate (typeof(RandomSizeCell))
};
_listView.ScrollTo (_items[2][1], _items[2], ScrollToPosition.Center, true);
var visible = new Button { Text = "Visible" };
visible.Clicked += (sender, args) => _listView.ScrollTo (_items[4][4], _items[4], ScrollToPosition.MakeVisible, _animate);
var start = new Button { Text = "Start" };
start.Clicked += (sender, args) => _listView.ScrollTo (_items[4][4], _items[4], ScrollToPosition.Start, _animate);
var center = new Button { Text = "Center"};
center.Clicked += (sender, args) => _listView.ScrollTo (_items[4][4], _items[4], ScrollToPosition.Center, _animate);
var end = new Button { Text = "End" };
end.Clicked += (sender, args) => _listView.ScrollTo (_items[4][4], _items[4], ScrollToPosition.End, _animate);
var animate = new Button { Text = "Animate" };
animate.Clicked += (sender, args) => {
_animate = !_animate;
animate.Text = (_animate) ? "Animate" : "No Animate";
};
var buttons = new StackLayout {
Orientation = StackOrientation.Horizontal,
Spacing = 1,
HorizontalOptions = LayoutOptions.Center,
Children = {
visible,
start,
center,
end,
animate
}
};
Content = new StackLayout {
Children = {
buttons,
_listView
}
};
}
}
}
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