public PippoCollectionUserControl()
{
InitializeComponent();
DataContextChanged += (sender, args) =>
{
if (_pippoCollection == args.NewValue || args.NewValue == null)
{
return;
}
_pippoCollection = (PippoCollection)args.NewValue;
if (RootGrid.ColumnDefinitions.Count != _pippoCollection.Count)
{
RootGrid.Children.Clear();
RootGrid.ColumnDefinitions.Clear();
for (var index = 0; index < _pippoCollection.Count; index++)
{
RootGrid.ColumnDefinitions.Add(new ColumnDefinition
{
Width = new GridLength(1, GridUnitType.Star)
});
var border = new Border
{
BorderBrush = new SolidColorBrush(Colors.BlueViolet),
BorderThickness = new Thickness(1),
Child = new TextBlock {
VerticalAlignment = VerticalAlignment.Center
}
};
Grid.SetColumn(border, index);
RootGrid.Children.Add(border);
}
}
for (var index = 0; index < _pippoCollection.Count; index++)
{
Pippo pippo = _pippoCollection[index];
((TextBlock)((Border)RootGrid.Children[index]).Child).Text = pippo.Intero.ToString();
}
};
RootGrid.Tapped += async(sender, args) =>
{
Point position = args.GetPosition(null);
List <UIElement> elements =
VisualTreeHelper.FindElementsInHostCoordinates(position, RootGrid).ToList();
if (elements.Count > 0 && elements[0] is TextBlock textBlock)
{
args.Handled = true;
await BigDynamicListPage.DoSomething(textBlock.Text);
}
};
RootGrid.Tapped += async(sender, args) =>
{
await BigDynamicListPage.DoSomething("second tap");
};
}
public PageViewModel()
{
var random = new Random(DateTime.UtcNow.Millisecond);
var ints = new List <PippoCollection>();
for (var i = 0; i < 100000; i++)
{
var a = new PippoCollection();
for (var j = 0; j < 30; j++)
{
a.Add(new Pippo {
Intero = random.Next()
});
}
ints.Add(a);
}
Ints = ints;
}
