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* Reminder for future me. * Move compiled bindings to Avalonia base. * Update suppressions. * Update API suppressions --------- Co-authored-by: Julien Lebosquain <julien@lebosquain.net>pull/20480/head
Steven Kirk
3 weeks ago
committed by
GitHub
GitHub
11 changed files with 258 additions and 230 deletions
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using System; |
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using System.Collections.Generic; |
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using System.ComponentModel; |
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using System.Globalization; |
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using Avalonia.Controls; |
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using Avalonia.Data.Converters; |
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using Avalonia.Data.Core; |
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using Avalonia.Data.Core.ExpressionNodes; |
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using Avalonia.Data.Core.Parsers; |
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namespace Avalonia.Data; |
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/// <summary>
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/// A binding which does not use reflection to access members.
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/// </summary>
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public class CompiledBinding : BindingBase |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="CompiledBinding"/> class.
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/// </summary>
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public CompiledBinding() { } |
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/// <summary>
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/// Initializes a new instance of the <see cref="CompiledBinding"/> class.
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/// </summary>
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/// <param name="path">The binding path.</param>
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public CompiledBinding(CompiledBindingPath path) => Path = path; |
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/// <summary>
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/// Gets or sets the amount of time, in milliseconds, to wait before updating the binding
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/// source after the value on the target changes.
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/// </summary>
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/// <remarks>
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/// There is no delay when the source is updated via <see cref="UpdateSourceTrigger.LostFocus"/>
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/// or <see cref="BindingExpressionBase.UpdateSource"/>. Nor is there a delay when
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/// <see cref="BindingMode.OneWayToSource"/> is active and a new source object is provided.
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/// </remarks>
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public int Delay { get; set; } |
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/// <summary>
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/// Gets or sets the <see cref="IValueConverter"/> to use.
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/// </summary>
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public IValueConverter? Converter { get; set; } |
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/// <summary>
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/// Gets or sets the culture in which to evaluate the converter.
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/// </summary>
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/// <value>The default value is null.</value>
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/// <remarks>
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/// If this property is not set then <see cref="CultureInfo.CurrentCulture"/> will be used.
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/// </remarks>
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[TypeConverter(typeof(CultureInfoIetfLanguageTagConverter))] |
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public CultureInfo? ConverterCulture { get; set; } |
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/// <summary>
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/// Gets or sets a parameter to pass to <see cref="Converter"/>.
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/// </summary>
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public object? ConverterParameter { get; set; } |
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/// <summary>
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/// Gets or sets the value to use when the binding is unable to produce a value.
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/// </summary>
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public object? FallbackValue { get; set; } = AvaloniaProperty.UnsetValue; |
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/// <summary>
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/// Gets or sets the binding mode.
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/// </summary>
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public BindingMode Mode { get; set; } |
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/// <summary>
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/// Gets or sets the binding path.
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/// </summary>
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public CompiledBindingPath? Path { get; set; } |
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/// <summary>
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/// Gets or sets the binding priority.
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/// </summary>
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public BindingPriority Priority { get; set; } |
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/// <summary>
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/// Gets or sets the source for the binding.
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/// </summary>
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public object? Source { get; set; } = AvaloniaProperty.UnsetValue; |
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/// <summary>
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/// Gets or sets the string format.
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/// </summary>
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public string? StringFormat { get; set; } |
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/// <summary>
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/// Gets or sets the value to use when the binding result is null.
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/// </summary>
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public object? TargetNullValue { get; set; } = AvaloniaProperty.UnsetValue; |
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/// <summary>
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/// Gets or sets a value that determines the timing of binding source updates for
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/// <see cref="BindingMode.TwoWay"/> and <see cref="BindingMode.OneWayToSource"/> bindings.
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/// </summary>
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public UpdateSourceTrigger UpdateSourceTrigger { get; set; } |
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internal WeakReference? DefaultAnchor { get; set; } |
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internal WeakReference<INameScope?>? NameScope { get; set; } |
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internal override BindingExpressionBase CreateInstance( |
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AvaloniaObject target, |
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AvaloniaProperty? targetProperty, |
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object? anchor) |
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{ |
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var enableDataValidation = targetProperty?.GetMetadata(target).EnableDataValidation ?? false; |
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var nodes = new List<ExpressionNode>(); |
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var isRooted = false; |
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Path?.BuildExpression(nodes, out isRooted); |
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// If the binding isn't rooted (i.e. doesn't have a Source or start with $parent, $self,
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// #elementName etc.) then we need to add a data context source node.
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if (Source == AvaloniaProperty.UnsetValue && !isRooted) |
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nodes.Insert(0, ExpressionNodeFactory.CreateDataContext(targetProperty)); |
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// If the first node is an ISourceNode then allow it to select the source; otherwise
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// use the binding source if specified, falling back to the target.
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var source = nodes?.Count > 0 && nodes[0] is SourceNode sn |
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? sn.SelectSource(Source, target, anchor ?? DefaultAnchor?.Target) |
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: Source != AvaloniaProperty.UnsetValue ? Source : target; |
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var (mode, trigger) = ResolveDefaultsFromMetadata(target, targetProperty); |
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return new BindingExpression( |
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source, |
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nodes, |
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FallbackValue, |
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delay: TimeSpan.FromMilliseconds(Delay), |
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converter: Converter, |
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converterCulture: ConverterCulture, |
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converterParameter: ConverterParameter, |
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enableDataValidation: enableDataValidation, |
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mode: mode, |
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priority: Priority, |
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stringFormat: StringFormat, |
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targetNullValue: TargetNullValue, |
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targetProperty: targetProperty, |
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targetTypeConverter: TargetTypeConverter.GetDefaultConverter(), |
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updateSourceTrigger: trigger); |
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} |
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private (BindingMode, UpdateSourceTrigger) ResolveDefaultsFromMetadata( |
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AvaloniaObject target, |
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AvaloniaProperty? targetProperty) |
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{ |
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var mode = Mode; |
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var trigger = UpdateSourceTrigger == UpdateSourceTrigger.Default ? |
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UpdateSourceTrigger.PropertyChanged : UpdateSourceTrigger; |
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if (mode == BindingMode.Default) |
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{ |
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if (targetProperty?.GetMetadata(target) is { } metadata) |
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mode = metadata.DefaultBindingMode; |
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else |
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mode = BindingMode.OneWay; |
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} |
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return (mode, trigger); |
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} |
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} |
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