зеркало из https://github.com/DeGsoft/maui-linux.git
174 строки
4.3 KiB
C#
174 строки
4.3 KiB
C#
using Xamarin.Forms.CustomAttributes;
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using Xamarin.Forms.Internals;
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using System.ComponentModel;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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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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// Apply the default category of "Issues" to all of the tests in this assembly
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// We use this as a catch-all for tests which haven't been individually categorized
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#if UITEST
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[assembly: NUnit.Framework.Category("Issues")]
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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, 55745, "[iOS] NRE in ListView with HasUnevenRows=true after changing content and rebinding", PlatformAffected.iOS)]
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public class Bugzilla55745 : TestContentPage
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{
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const string ButtonId = "button";
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ViewModel vm;
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protected override void Init()
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{
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vm = new ViewModel();
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BindingContext = vm;
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var listView = new ListView
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{
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HasUnevenRows = true,
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ItemTemplate = new DataTemplate(() =>
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{
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var label1 = new Label();
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label1.SetBinding(Label.TextProperty, nameof(DataViewModel.TextOne));
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var label2 = new Label();
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label2.SetBinding(Label.TextProperty, nameof(DataViewModel.TextTwo));
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return new ViewCell { View = new StackLayout { Children = { label1, label2 } } };
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})
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};
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listView.SetBinding(ListView.ItemsSourceProperty, nameof(vm.MyCollection));
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var button = new Button { Text = "Tap me twice. The app should not crash.", AutomationId = ButtonId };
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button.Clicked += Button_Clicked;
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Content = new StackLayout { Children = { button, listView } };
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}
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void Button_Clicked(object sender, System.EventArgs e)
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{
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vm.ToggleContent();
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}
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[Preserve(AllMembers = true)]
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class DataViewModel : INotifyPropertyChanged
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{
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string mTextOne;
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string mTextTwo;
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public event PropertyChangedEventHandler PropertyChanged;
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public string TextOne
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{
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get { return mTextOne; }
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set
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{
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mTextOne = value;
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OnPropertyChanged(nameof(TextOne));
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}
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}
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public string TextTwo
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{
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get { return mTextTwo; }
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set
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{
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mTextTwo = value;
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OnPropertyChanged(nameof(TextTwo));
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}
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}
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protected virtual void OnPropertyChanged(string propertyName)
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{
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
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}
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}
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[Preserve(AllMembers = true)]
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class ViewModel : INotifyPropertyChanged
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{
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public List<DataViewModel> myList = new List<DataViewModel>()
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{
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new DataViewModel() { TextOne = "Super", TextTwo = "Juuu"},
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new DataViewModel() { TextOne = "Michael", TextTwo = "Maier"},
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new DataViewModel() { TextOne = "House", TextTwo = "Cat"},
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new DataViewModel() { TextOne = "Flower", TextTwo = "Rock"},
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new DataViewModel() { TextOne = "Job", TextTwo = "Dog"},
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new DataViewModel() { TextOne = "Super", TextTwo = "Juuu"},
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new DataViewModel() { TextOne = "Michael", TextTwo = "Maier"},
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new DataViewModel() { TextOne = "House", TextTwo = "Cat"},
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new DataViewModel() { TextOne = "Flower", TextTwo = "Rock"},
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new DataViewModel() { TextOne = "Job", TextTwo = "Dog"}
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};
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ObservableCollection<DataViewModel> mMyCollection;
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DataViewModel mSelectedData;
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public ViewModel()
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{
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MyCollection = new ObservableCollection<DataViewModel>(myList);
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}
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public event PropertyChangedEventHandler PropertyChanged;
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public ObservableCollection<DataViewModel> MyCollection
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{
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get
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{
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return mMyCollection;
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}
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set
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{
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mMyCollection = value;
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OnPropertyChanged(nameof(MyCollection));
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}
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}
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public DataViewModel SelectedData
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{
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get { return mSelectedData; }
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set
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{
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mSelectedData = value;
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OnPropertyChanged(nameof(SelectedData));
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}
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}
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public void ToggleContent()
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{
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if (MyCollection.Count < 3)
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{
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MyCollection.Clear();
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MyCollection = new ObservableCollection<DataViewModel>(myList);
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}
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else
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{
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MyCollection.Clear();
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MyCollection.Add(myList[2]);
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}
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}
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protected virtual void OnPropertyChanged(string propertyName)
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{
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
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}
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}
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#if UITEST
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[Test]
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public void Bugzilla55745Test()
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{
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RunningApp.WaitForElement(q => q.Marked(ButtonId));
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RunningApp.Tap(q => q.Marked(ButtonId));
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RunningApp.Tap(q => q.Marked(ButtonId));
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}
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#endif
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}
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} |