Toolkit.Avalonia
This commit is contained in:
TheXamlGuy
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using Avalonia.Controls;
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using Avalonia.Controls.Primitives;
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using FluentAvalonia.UI.Navigation;
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using System.Reflection;
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using Toolkit.Foundation;
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using Toolkit.UI.Controls.Avalonia;
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namespace Toolkit.Avalonia;
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public class FrameHandler(INavigationContext navigationContext) :
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INavigateHandler<Frame>,
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INavigateBackHandler<Frame>
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{
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public Task Handle(Navigate<Frame> args,
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CancellationToken cancellationToken)
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{
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if (args.Context is Frame frame)
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{
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frame.NavigationPageFactory ??= new NavigationPageFactory();
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if (args.Template is Control control)
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{
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void NavigatingFrom(object? sender,
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Control control)
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{
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async void HandleNavigatingFrom(object? _,
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NavigatingCancelEventArgs args)
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{
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Dictionary<string,object> results = [];
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control.RemoveHandler(Frame.NavigatingFromEvent, HandleNavigatingFrom);
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NavigatedFrom(sender, control, () => results);
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if (control.DataContext is object content)
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{
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if (content is IPrimaryConfirmation confirmNavigation &&
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!await confirmNavigation.Confirm())
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{
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args.Cancel = true;
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}
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if (!args.Cancel)
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{
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if (content is IDeactivating deactivating)
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{
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await deactivating.Deactivating();
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}
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Type contentType = content.GetType();
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if (contentType.GetInterfaces() is Type[] contracts)
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{
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foreach (Type contract in contracts)
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{
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if (contract.Name == typeof(IDeactivating<>).Name &&
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contract.GetGenericArguments() is { Length: 1 } arguments)
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{
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if (contentType.GetMethods().FirstOrDefault(x =>
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x.Name == "Deactivating" && x.ReturnType == typeof(Task<>)
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.MakeGenericType(arguments[0]))
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is MethodInfo methodInfo)
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{
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if (methodInfo.GetCustomAttribute<NavigationContextAttribute>()
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is NavigationContextAttribute attribute)
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{
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if (await methodInfo.InvokeAsync<object?>(content) is object result)
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{
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results.Add(attribute.Name, result);
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}
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}
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}
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}
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}
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}
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}
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}
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}
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control.AddHandler(Frame.NavigatingFromEvent, HandleNavigatingFrom);
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}
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void NavigatedFrom(object? sender,
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Control control,
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Func<Dictionary<string, object>> resultCallBack)
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{
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async void HandleNavigatedFrom(object? _,
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NavigationEventArgs args)
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{
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control.RemoveHandler(Frame.NavigatedFromEvent, HandleNavigatedFrom);
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if (args.NavigationMode == NavigationMode.New)
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{
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NavigatedTo(sender, control);
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}
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Dictionary<string, object> results = resultCallBack.Invoke();
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async Task DoNavigatedFromAsync(object? content)
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{
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if (content is not null)
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{
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if (content is IDeactivated deactivated)
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{
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await deactivated.Deactivated();
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}
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Type contentType = content.GetType();
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if (contentType.GetInterfaces() is Type[] contracts)
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{
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foreach (Type contract in contracts)
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{
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if (contract.Name == typeof(IActivated<>).Name &&
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contract.GetGenericArguments() is { Length: 1 } arguments)
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{
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if (contentType.GetMethods().FirstOrDefault(x =>
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x.Name == "NavigatedToAsync" &&
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x.GetCustomAttribute<NavigationContextAttribute>()
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is NavigationContextAttribute attribute && results.ContainsKey(attribute.Name))
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is MethodInfo methodInfo)
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{
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if (methodInfo.GetCustomAttribute<NavigationContextAttribute>()
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is NavigationContextAttribute attribute)
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{
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if (results.TryGetValue(attribute.Name, out object? value))
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{
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await methodInfo.InvokeAsync(content, value);
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}
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}
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}
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}
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}
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}
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}
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}
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if (args.Source is TemplatedControl sourceTemplate)
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{
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if (sourceTemplate.DataContext is object content)
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{
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await DoNavigatedFromAsync(content);
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}
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}
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if (sender is TemplatedControl senderTemplate)
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{
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if (senderTemplate.DataContext is object content)
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{
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await DoNavigatedFromAsync(content);
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}
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}
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else
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{
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await DoNavigatedFromAsync(sender);
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}
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}
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control.AddHandler(Frame.NavigatedFromEvent, HandleNavigatedFrom);
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}
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void NavigatedTo(object? sender,
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Control control)
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{
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async void HandleNavigatedTo(object? _,
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NavigationEventArgs __)
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{
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control.RemoveHandler(Frame.NavigatedToEvent, HandleNavigatedTo);
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NavigatingFrom(sender, control);
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if (control.DataContext is object content)
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{
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if (content is IInitializer initializer)
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{
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await initializer.Initialize();
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}
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if (content is IActivated activated)
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{
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await activated.Activated();
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}
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}
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}
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control.AddHandler(Frame.NavigatedToEvent, HandleNavigatedTo);
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}
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control.DataContext = args.Content;
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navigationContext.Set(control);
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NavigatedTo(args.Sender, control);
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frame.NavigateFromObject(control);
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}
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}
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return Task.CompletedTask;
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}
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public Task Handle(NavigateBack<Frame> args,
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CancellationToken cancellationToken = default)
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{
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if (args.Context is Frame frame)
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{
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frame.GoBack();
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}
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return Task.CompletedTask;
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}
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}
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