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using System;
using System.Collections.ObjectModel;
using Xamarin.Forms;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
#if UITEST
using NUnit.Framework;
using Xamarin.UITest;
#endif
namespace Xamarin.Forms.Controls.Issues
{
[Preserve (AllMembers=true)]
[Issue (IssueTracker.Github, 2259, "ListView.ScrollTo crashes app", PlatformAffected.iOS)]
public class Issue2259 : TestContentPage
{
[Preserve (AllMembers = true)]
public class Person
{
public string Name { private set; get; }
public DateTime Birthday { private set; get; }
public Color FavoriteColor { private set; get; }
public Person (string name, DateTime birthday, Color favoriteColor)
{
Name = name;
Birthday = birthday;
FavoriteColor = favoriteColor;
}
};
int _count = 1;
protected override void Init ()
{
var people = new ObservableCollection<Person> {
new Person ("Abigail", new DateTime (1975, 1, 15), Color.Aqua),
new Person ("Bob", new DateTime (1976, 2, 20), Color.Black),
new Person ("Cathy", new DateTime (1977, 3, 10), Color.Blue),
#pragma warning disable 618
new Person ("David", new DateTime (1978, 4, 25), Color.Fuschia),
#pragma warning restore 618
};
var buttonAdd = new Button {
Text = "Add",
HorizontalOptions = LayoutOptions.Start,
VerticalOptions = LayoutOptions.Center,
};
var buttonRemove = new Button {
Text = "Remove",
HorizontalOptions = LayoutOptions.Center,
VerticalOptions = LayoutOptions.Center,
};
var buttonScrollToBottom = new Button {
Text = "Bottom",
HorizontalOptions = LayoutOptions.Start,
VerticalOptions = LayoutOptions.Center,
};
var buttonStack = new StackLayout {
Orientation = StackOrientation.Horizontal,
Children = {
buttonAdd,
buttonRemove,
buttonScrollToBottom,
}
};
var listView = new ListView {
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
ItemsSource = people,
ItemTemplate = new DataTemplate (() =>
{
var nameLabel = new Label ();
var birthdayLabel = new Label ();
var boxView = new BoxView ();
var stack = new StackLayout {
Padding = new Thickness (0, 5),
Orientation = StackOrientation.Horizontal,
BackgroundColor = Color.Black,
Children = {
boxView,
new StackLayout {
VerticalOptions = LayoutOptions.Center,
Spacing = 0,
Children = {
nameLabel,
birthdayLabel
}
}
}
};
nameLabel.SetBinding (Label.TextProperty, "Name");
birthdayLabel.SetBinding (Label.TextProperty, new Binding ("Birthday", BindingMode.OneWay, null, null, "Born {0:d}"));
boxView.SetBinding (BoxView.ColorProperty, "FavoriteColor");
stack.SetBinding (BackgroundColorProperty, "BackgroundColor");
return new ViewCell {
View = stack
};
})
};
buttonAdd.Clicked += (sender, e) =>
{
var person = new Person (string.Format ("Name {0}", _count++), DateTime.Today, Color.Blue);
people.Add (person);
listView.ScrollTo (person, ScrollToPosition.End, true);
};
buttonRemove.Clicked += (sender, e) => people.RemoveAt (people.Count - 1);
buttonScrollToBottom.Clicked += (sender, e) =>
{
var person = people[people.Count - 1];
listView.ScrollTo (person, ScrollToPosition.End, true);
};
Padding = new Thickness (10, Device.OnPlatform (20, 0, 0), 10, 5);
Content = new StackLayout {
Orientation = StackOrientation.Vertical,
Children = {
buttonStack,
listView,
}
};
}
#if UITEST
[Test]
[UiTest (typeof(ListView), "ScrollTo")]
public void Issue2259Tests ()
{
for (int i = 0; i < 20; i++) {
RunningApp.Tap (q => q.Button ("Add"));
RunningApp.WaitForElement (q => q.Marked ("Name " + (i + 1).ToString ()));
RunningApp.Screenshot ("Added Cell");
}
}
#endif
}
}
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