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EventLoop V1

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This commit is contained in:
Ádám Kovács
2023-08-08 12:49:15 +02:00
parent 7b8764ac16
commit 52536b569d
21 changed files with 479 additions and 68 deletions
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97
src/Library/TerminalUI/Binding.cs
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@@ -1,4 +1,5 @@
using System.ComponentModel;
using System.Linq.Expressions;
using System.Reflection;
using TerminalUI.Controls;
using TerminalUI.Traits;
@@ -8,41 +9,103 @@ namespace TerminalUI;
public class Binding<TDataContext, TResult> : IDisposable
{
private readonly Func<TDataContext, TResult> _dataContextMapper;
private IView<TDataContext> _view;
private IView<TDataContext> _dataSourceView;
private object? _propertySource;
private PropertyInfo _targetProperty;
private readonly List<string> _rerenderProperties;
private readonly IDisposableCollection? _propertySourceDisposableCollection;
private INotifyPropertyChanged? _dataSourceLastDataContext;
public Binding(
IView<TDataContext> view,
Func<TDataContext, TResult> dataContextMapper,
object? propertySource,
PropertyInfo targetProperty
IView<TDataContext> dataSourceView,
Expression<Func<TDataContext?, TResult>> dataContextExpression,
object? propertySource,
PropertyInfo targetProperty,
IEnumerable<string>? rerenderProperties = null
)
{
_view = view;
_dataContextMapper = dataContextMapper;
ArgumentNullException.ThrowIfNull(dataSourceView);
ArgumentNullException.ThrowIfNull(dataContextExpression);
ArgumentNullException.ThrowIfNull(targetProperty);
_dataSourceView = dataSourceView;
_dataContextMapper = dataContextExpression.Compile();
_propertySource = propertySource;
_targetProperty = targetProperty;
view.PropertyChanged += View_PropertyChanged;
_targetProperty.SetValue(_propertySource, _dataContextMapper(_view.DataContext));
if(propertySource is IDisposableCollection disposableCollection)
disposableCollection.AddDisposable(this);
view.AddDisposable(this);
_rerenderProperties = rerenderProperties?.ToList() ?? new List<string>();
FindReactiveProperties(dataContextExpression);
dataSourceView.PropertyChanged += View_PropertyChanged;
var initialValue = _dataContextMapper(_dataSourceView.DataContext);
_targetProperty.SetValue(_propertySource, initialValue);
if (propertySource is IDisposableCollection propertySourceDisposableCollection)
{
propertySourceDisposableCollection.AddDisposable(this);
_propertySourceDisposableCollection = propertySourceDisposableCollection;
}
if (_dataSourceView.DataContext is INotifyPropertyChanged dataSourcePropertyChanged)
{
_dataSourceLastDataContext = dataSourcePropertyChanged;
dataSourcePropertyChanged.PropertyChanged += DataContext_PropertyChanged;
}
dataSourceView.AddDisposable(this);
}
private void FindReactiveProperties(Expression expression)
{
if (expression is LambdaExpression lambdaExpression)
{
FindReactiveProperties(lambdaExpression.Body);
}
else if (expression is ConditionalExpression conditionalExpression)
{
FindReactiveProperties(conditionalExpression.IfFalse);
FindReactiveProperties(conditionalExpression.IfTrue);
}
else if (expression is MemberExpression {Member: PropertyInfo dataContextPropertyInfo})
{
_rerenderProperties.Add(dataContextPropertyInfo.Name);
}
//TODO: Handle other expression types
}
private void View_PropertyChanged(object? sender, PropertyChangedEventArgs e)
{
if (e.PropertyName != nameof(IView<TDataContext>.DataContext)) return;
_targetProperty.SetValue(_propertySource, _dataContextMapper(_view.DataContext));
if (_dataSourceLastDataContext is not null)
{
_dataSourceLastDataContext.PropertyChanged -= DataContext_PropertyChanged;
}
if (_dataSourceView.DataContext is INotifyPropertyChanged dataSourcePropertyChanged)
{
_dataSourceLastDataContext = dataSourcePropertyChanged;
dataSourcePropertyChanged.PropertyChanged += DataContext_PropertyChanged;
}
UpdateTargetProperty();
}
private void DataContext_PropertyChanged(object? sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == null
|| !_rerenderProperties.Contains(e.PropertyName)) return;
UpdateTargetProperty();
}
private void UpdateTargetProperty()
=> _targetProperty.SetValue(_propertySource, _dataContextMapper(_dataSourceView.DataContext));
public void Dispose()
{
_view.PropertyChanged -= View_PropertyChanged;
_view = null!;
_propertySourceDisposableCollection?.RemoveDisposable(this);
_dataSourceView.RemoveDisposable(this);
_dataSourceView.PropertyChanged -= View_PropertyChanged;
_dataSourceView = null!;
_propertySource = null!;
_targetProperty = null!;
}