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using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.CompilerServices;
namespace LibBeatmapDownload;
public class DownloadTaskList : INotifyPropertyChanged {
public DownloadTaskList() {
Tasks.CollectionChanged += (sender, args) => {
if (args.NewItems is { Count: > 0 })
foreach (var downloadTask in args.NewItems) {
if (downloadTask is not DownloadTask task) {
Debug.WriteLine($"[DownloadTaskList] New task is {downloadTask?.GetType().FullName ?? "null"}!");
continue;
}
task.PropertyChanged += (taskSender, taskArgs) => {
if (taskArgs.PropertyName == nameof(DownloadTask.Status)) {
if (task.Status == Status.Finished) {
Task.Run(async () => {
await Task.Delay(1000);
Tasks.Remove(task);
});
}
SetField(ref _tasks,
new ObservableCollection<DownloadTask>(
_tasks
.OrderByDescending(x => x.Progress)
.ThenByDescending(x => x.Status)
),
nameof(Tasks));
OnPropertyChanged(nameof(Tasks));
}
};
}
// OnPropertyChanged(nameof(Tasks));
};
}
public event PropertyChangedEventHandler? PropertyChanged;
private ObservableCollection<DownloadTask> _tasks = new();
public ObservableCollection<DownloadTask> Tasks {
get => _tasks;
set => SetField(ref _tasks, value);
}
protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null) {
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
protected bool SetField<T>(ref T field, T value, [CallerMemberName] string? propertyName = null) {
//check ObservableCollection by order
if (EqualityComparer<T>.Default.Equals(field, value)) return false;
field = value;
OnPropertyChanged(propertyName);
return true;
}
}
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