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using System;
using System.Linq;
using System.Collections.Generic;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
using System.ComponentModel;
namespace Xamarin.Forms.Controls
{
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Bugzilla, 44525, "Listview Row Height Does Not Adapt In iOS")]
public class Bugzilla44525 : TestContentPage
{
List<Person> _DataSource;
[Preserve(AllMembers = true)]
class CustomCell : ViewCell
{
public CustomCell()
{
Label age = new Label();
Label name = new Label();
StackLayout cellWrapper = new StackLayout();
age.SetBinding(Label.TextProperty, "Age");
name.SetBinding(Label.TextProperty, "Name");
age.PropertyChanged += UpdateCell;
name.PropertyChanged += UpdateCell;
cellWrapper.Children.Add(age);
cellWrapper.Children.Add(name);
View = cellWrapper;
}
void UpdateCell(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == Label.TextProperty.PropertyName)
{
ForceUpdateSize();
}
}
}
class Person : ViewModelBase
{
private string _Name;
public string Name
{
get
{
return _Name;
}
set
{
if (_Name == value)
return;
_Name = value;
OnPropertyChanged();
}
}
private string _Age;
public string Age
{
get
{
return _Age;
}
set
{
if (_Age == value)
return;
_Age = value;
OnPropertyChanged();
}
}
}
protected override void Init()
{
_DataSource = Enumerable.Range(1, 100).Select(c => new Person { Name = $"Person {c}", Age = $"{c} year(s) old" }).ToList();
var listView = new ListView(ListViewCachingStrategy.RecycleElement)
{
ItemTemplate = new DataTemplate(typeof(CustomCell)),
ItemsSource = _DataSource,
HasUnevenRows = true
};
var button = new Button { Text = "Click me" };
button.Clicked += (sender, e) =>
{
var target = _DataSource[1];
target.Name = "I am an exceptionally long string that should cause the label to wrap, thus increasing the size of the ViewCell such that the entirety of the string is readable by human eyes. Hurrah.";
};
Content = new StackLayout { Children = { button, listView } };
}
}
}
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