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Issue7395.cs
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Issue7395.cs
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using System;
using System.Collections.Generic;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
#if UITEST
using NUnit.Framework;
using Xamarin.Forms.Core.UITests;
using System.Linq;
#endif
namespace Xamarin.Forms.Controls.Issues
{
#if UITEST
[Category(UITestCategories.CollectionView)]
#endif
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Github, 7395, "Changing ItemTemplate does not work as expected", PlatformAffected.Android)]
public class Issue7395 : TestContentPage
{
CollectionView _collectionView;
public Issue7395()
{
Title = "Issue 7395";
}
protected override void Init()
{
var instructions = new Label
{
Text = "Click Two Columns. If all cells render correctly with 2 columns, then click Three Columns. If all cells render correctly with 3 columns, then the test passes."
};
var button1 = new Button
{
Text = "Two columns",
AutomationId = "TwoCol"
};
button1.Clicked += OnButton1Clicked;
var button2 = new Button
{
Text = "Three columns",
AutomationId = "ThreeCol"
};
button2.Clicked += OnButton2Clicked;
_collectionView = new CollectionView
{
BackgroundColor = Color.LightGreen,
SelectionMode = SelectionMode.None,
HeightRequest = 500
};
var lines = new List<Issue7395Model>();
for (int i = 0; i < 30; i++)
{
lines.Add(new Issue7395Model() { Text = i.ToString() });
}
_collectionView.ItemsSource = lines;
var stack = new StackLayout();
stack.Children.Add(instructions);
stack.Children.Add(button1);
stack.Children.Add(button2);
stack.Children.Add(_collectionView);
Content = stack;
}
void OnButton1Clicked(object sender, EventArgs e)
{
_collectionView.ItemTemplate = CreateDataGridTemplate(2);
}
void OnButton2Clicked(object sender, EventArgs e)
{
_collectionView.ItemTemplate = CreateDataGridTemplate(3);
}
DataTemplate CreateDataGridTemplate(int columns)
{
DataTemplate template = new DataTemplate(() =>
{
var grid = new Grid() { Padding = new Thickness(0), Margin = 0, RowSpacing = 0, ColumnSpacing = 0 };
grid.RowDefinitions.Clear();
grid.ColumnDefinitions.Clear();
grid.Children.Clear();
grid.RowDefinitions.Add(new RowDefinition() { Height = 40 });
grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(1, GridUnitType.Star) });
Label cell;
cell = new Label() { };
cell.SetBinding(Label.TextProperty, "Text");
cell.FontSize = 20;
cell.FontAttributes = FontAttributes.Bold;
cell.BackgroundColor = Color.LightBlue;
grid.Children.Add(cell, 0, 0);
for (int i = 0; i < columns; i++)
{
grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(1, GridUnitType.Star) });
cell = new Label() { };
cell.Text = "Col:" + i;
cell.FontAttributes = FontAttributes.Bold;
cell.BackgroundColor = Color.Beige;
grid.Children.Add(cell, i + 1, 0);
}
return grid;
});
return template;
}
}
[Preserve(AllMembers = true)]
public class Issue7395Model
{
public string Text { get; set; }
}
}