180 строки
4.3 KiB
C#
180 строки
4.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Linq;
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using Xamarin.Forms.Internals;
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using Xamarin.Forms.CustomAttributes;
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#if UITEST
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using Xamarin.UITest;
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using NUnit.Framework;
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#endif
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namespace Xamarin.Forms.Controls.Issues
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{
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[Preserve(AllMembers = true)]
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[Issue(IssueTracker.Bugzilla, 60524, "NRE when rendering ListView with grouping enabled and HasUnevenRows set to true", PlatformAffected.iOS)]
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public class Bugzilla60524 : TestNavigationPage
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{
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[Preserve(AllMembers = true)]
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public class GroupedItemsPage : ContentPage
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{
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private ObservableCollection<Grouping<string, GroupedItem>> model;
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private ListView listView;
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public GroupedItemsPage()
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{
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listView = new ListView(ListViewCachingStrategy.RetainElement) { HasUnevenRows = true };
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listView.IsGroupingEnabled = true;
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listView.ItemTemplate = new GroupedItemsDataTemplateSelector();
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var headerCell = new DataTemplate(typeof(TextCell));
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headerCell.SetBinding(TextCell.TextProperty, "Key");
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this.listView.GroupHeaderTemplate = headerCell;
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this.model = new ObservableCollection<Grouping<string, GroupedItem>>();
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this.GetItems();
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this.SetMainContent();
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}
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private void GetItems()
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{
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var zeroGroup = new Grouping<string, GroupedItem>("Group 0", new List<GroupedItem> {
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});
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var firstGroup = new Grouping<string, GroupedItem>("Group 1", new List<GroupedItem> {
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new GroupedItem("Group 1", "Item 1"),
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new GroupedItem("Group 1", "Item 2")
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});
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var secondGroup = new Grouping<string, GroupedItem>("Group 2", new List<GroupedItem> {
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new GroupedItem("Group 2", "Item 3"),
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new GroupedItem("Group 2", "Item 4")
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});
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model.Add(zeroGroup);
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model.Add(firstGroup);
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model.Add(secondGroup);
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this.listView.ItemsSource = model;
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}
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private void SetMainContent()
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{
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var content = new StackLayout
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{
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VerticalOptions = LayoutOptions.FillAndExpand,
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Children = { new Label { Text = "If this page does not crash, this test has passed." }, this.listView }
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};
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Content = content;
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}
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}
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[Preserve(AllMembers = true)]
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public class GroupedItemsDataTemplateSelector : Xamarin.Forms.DataTemplateSelector
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{
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private readonly DataTemplate firstGroupTemplate;
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private readonly DataTemplate secondGroupTemplate;
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public GroupedItemsDataTemplateSelector()
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{
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// Retain instances
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var firstTemplate = new DataTemplate(typeof(TextCell));
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firstTemplate.SetBinding(TextCell.TextProperty, "Item");
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this.firstGroupTemplate = firstTemplate;
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var secondTemplate = new DataTemplate(typeof(ImageCell));
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secondTemplate.SetBinding(ImageCell.TextProperty, "Item");
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this.secondGroupTemplate = secondTemplate;
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}
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protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
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{
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var model = item as GroupedItem;
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if (model == null)
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{
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return null;
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}
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return model.Group == "Group 1" ? this.firstGroupTemplate : this.secondGroupTemplate;
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}
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}
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[Preserve(AllMembers = true)]
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public class GroupedItem
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{
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public string Group { get; set; }
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public string Item { get; set; }
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public GroupedItem(string group, string item)
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{
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this.Group = group;
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this.Item = item;
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}
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}
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[Preserve(AllMembers = true)]
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public class Grouping<K, T> : ObservableCollection<T>
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{
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public K Key { get; private set; }
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public IList<T> Values
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{
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get { return this.Items; }
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}
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public Grouping(K key, IEnumerable<T> items)
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{
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Key = key;
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foreach (var item in items)
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{
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this.Items.Add(item);
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}
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}
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public Grouping(IGrouping<K, T> grouping)
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{
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Key = grouping.Key;
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foreach (var item in grouping)
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{
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this.Items.Add(item);
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}
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}
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public void AddRange(IList<T> values)
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{
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foreach (var item in values)
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{
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this.Items.Add(item);
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}
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}
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}
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[Preserve(AllMembers = true)]
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public class GroupingKey
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{
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public string Title { get; private set; }
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public string Abbreviation { get; private set; }
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public GroupingKey(string Title, string abbrevation)
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{
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this.Title = Title;
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this.Abbreviation = abbrevation;
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}
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}
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protected override void Init()
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{
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Navigation.PushAsync(new GroupedItemsPage());
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}
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#if UITEST
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[Test]
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public void Bugzilla60524Test()
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{
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RunningApp.WaitForElement(q => q.Marked("Group 1"));
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}
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#endif
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}
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} |