public XamarinListViewScrollToBugPage1()
{
Title = "Scroll To in OnAppearing";
for (int i = 0; i < 100; i++)
{
var item = new ListObj {
Name = string.Format("{0} {0} {0} {0} {0} {0}", i)
};
_collection.Add(item);
}
_listView = new ListView
{
ItemsSource = _collection,
ItemTemplate = new DataTemplate(typeof(CellTemplateScrollTo))
};
_listView.AutomationId = "listView";
Content = new StackLayout
{
Children =
{
_listView
}
};
}
void BtnAddOnClicked(object sender, EventArgs eventArgs)
{
var str = string.Format("Item {0}", _i++);
var item = new ListObj {
Name = string.Format("{0} {0} {0} {0} {0} {0}", _i)
};
_collection.Add(item);
_listView.ScrollTo(item, ScrollToPosition.End, true);
}
public XamarinListViewScrollToBugPage2()
{
Padding = new Thickness(10, 50, 10, 0);
Title = "Crash in ScrollToPosition.End";
for (int i = 0; i < 100; i++)
{
var item = new ListObj {
Name = string.Format("2 {0} {0} {0} {0} {0} {0}", i)
};
_collection.Add(item);
}
_listView = new ListView
{
ItemsSource = _collection,
ItemTemplate = new DataTemplate(typeof(CellTemplateScrollTo))
};
var endButton = new Button
{
Text = "ScrollToPosition.End End - Not animated",
Command = new Command(() =>
{
_listView.ScrollTo(_collection.Last(), ScrollToPosition.End, false);
})
};
var endButtonAnimated = new Button
{
Text = "ScrollToPosition.MakeVisible End - Animated",
Command = new Command(() =>
{
_listView.ScrollTo(_collection.Last(), ScrollToPosition.MakeVisible, true);
})
};
Content = new StackLayout
{
Children =
{
endButton,
endButtonAnimated,
_listView
}
};
}
public XamarinListViewScrollToBugPage3()
{
Title = "Scroll To in OnAppearing Uneven";
bool runTest = true;
// This test will fail in iOS < 9 because using ScrollTo with UnevenRows with estimation is currently not working.
// It did not previously fail because this test used `TakePerformanceHit` to turn off row estimation. However, as
// that was never a public feature, it was never a valid fix for the test.
// https://bugzilla.xamarin.com/show_bug.cgi?id=28277
#if !UITEST
if (App.IOSVersion < 9)
{
runTest = false;
}
#endif
if (!runTest)
{
_collection.Add(new ListObj {
Name = DontRun
});
}
else
{
for (_i = 0; _i < 100; _i++)
{
var item = new ListObj {
Name = string.Format("{0} {0} {0} {0} {0} {0}", _i)
};
_collection.Add(item);
}
}
var btnAdd = new Button
{
Text = "Add item",
WidthRequest = 100
};
btnAdd.Clicked += BtnAddOnClicked;
var btnBottom = new Button
{
Text = "Scroll to end",
WidthRequest = 100
};
btnBottom.Clicked += BtnBottomOnClicked;
var btnPanel = new StackLayout
{
Orientation = StackOrientation.Horizontal,
HorizontalOptions = LayoutOptions.Center,
Children =
{
btnAdd,
btnBottom
}
};
_listView = new ListView
{
ItemsSource = _collection,
BackgroundColor = Color.Transparent,
VerticalOptions = LayoutOptions.FillAndExpand,
HasUnevenRows = true,
ItemTemplate = new DataTemplate(typeof(CellTemplateScrollToUneven))
};
_listView.ItemTapped += (sender, e) => ((ListView)sender).SelectedItem = null;
_listView.AutomationId = "listView";
Content = new StackLayout
{
Children =
{
btnPanel,
_listView
}
};
}
