Florian
8 years ago
committed by
GitHub
GitHub
24 changed files with 385 additions and 111 deletions
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// Copyright (c) The Avalonia Project. All rights reserved.
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// Licensed under the MIT license. See licence.md file in the project root for full license information.
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using System; |
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using System.Collections; |
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using System.Collections.Generic; |
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using System.Collections.Specialized; |
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using System.Reactive; |
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using System.Reactive.Disposables; |
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using System.Reactive.Linq; |
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using System.Reactive.Subjects; |
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using Avalonia.Utilities; |
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namespace Avalonia.Collections |
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{ |
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public static class NotifyCollectionChangedExtensions |
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{ |
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/// <summary>
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/// Gets a weak observable for the CollectionChanged event.
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/// </summary>
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/// <param name="collection">The collection.</param>
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/// <returns>An observable.</returns>
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public static IObservable<NotifyCollectionChangedEventArgs> GetWeakCollectionChangedObservable( |
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this INotifyCollectionChanged collection) |
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{ |
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Contract.Requires<ArgumentNullException>(collection != null); |
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return new WeakCollectionChangedObservable(new WeakReference<INotifyCollectionChanged>(collection)); |
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} |
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/// <summary>
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/// Subcribes to the CollectionChanged event using a weak subscription.
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/// </summary>
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/// <param name="collection">The collection.</param>
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/// <param name="handler">
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/// An action called when the collection event is raised.
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/// </param>
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/// <returns>A disposable used to terminate the subscription.</returns>
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public static IDisposable WeakSubscribe( |
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this INotifyCollectionChanged collection, |
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NotifyCollectionChangedEventHandler handler) |
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{ |
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Contract.Requires<ArgumentNullException>(collection != null); |
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Contract.Requires<ArgumentNullException>(handler != null); |
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return |
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collection.GetWeakCollectionChangedObservable() |
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.Subscribe(e => handler.Invoke(collection, e)); |
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} |
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/// <summary>
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/// Subcribes to the CollectionChanged event using a weak subscription.
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/// </summary>
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/// <param name="collection">The collection.</param>
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/// <param name="handler">
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/// An action called when the collection event is raised.
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/// </param>
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/// <returns>A disposable used to terminate the subscription.</returns>
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public static IDisposable WeakSubscribe( |
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this INotifyCollectionChanged collection, |
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Action<NotifyCollectionChangedEventArgs> handler) |
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{ |
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Contract.Requires<ArgumentNullException>(collection != null); |
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Contract.Requires<ArgumentNullException>(handler != null); |
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return |
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collection.GetWeakCollectionChangedObservable() |
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.Subscribe(handler); |
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} |
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private class WeakCollectionChangedObservable : ObservableBase<NotifyCollectionChangedEventArgs>, |
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IWeakSubscriber<NotifyCollectionChangedEventArgs> |
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{ |
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private WeakReference<INotifyCollectionChanged> _sourceReference; |
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private readonly Subject<NotifyCollectionChangedEventArgs> _changed = new Subject<NotifyCollectionChangedEventArgs>(); |
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private int _count; |
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public WeakCollectionChangedObservable(WeakReference<INotifyCollectionChanged> source) |
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{ |
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_sourceReference = source; |
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} |
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public void OnEvent(object sender, NotifyCollectionChangedEventArgs e) |
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{ |
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_changed.OnNext(e); |
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} |
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protected override IDisposable SubscribeCore(IObserver<NotifyCollectionChangedEventArgs> observer) |
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{ |
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if (_sourceReference.TryGetTarget(out INotifyCollectionChanged instance)) |
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{ |
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if (_count++ == 0) |
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{ |
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WeakSubscriptionManager.Subscribe( |
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instance, |
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nameof(instance.CollectionChanged), |
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this); |
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} |
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return Observable.Using(() => Disposable.Create(DecrementCount), _ => _changed) |
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.Subscribe(observer); |
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} |
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else |
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{ |
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_changed.OnCompleted(); |
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observer.OnCompleted(); |
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return Disposable.Empty; |
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} |
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} |
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private void DecrementCount() |
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{ |
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if (--_count == 0) |
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{ |
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if (_sourceReference.TryGetTarget(out INotifyCollectionChanged instance)) |
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{ |
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WeakSubscriptionManager.Unsubscribe( |
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instance, |
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nameof(instance.CollectionChanged), |
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this); |
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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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@ -1,20 +1,38 @@ |
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<Style xmlns="https://github.com/avaloniaui" Selector="ProgressBar"> |
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<Setter Property="Background" Value="{DynamicResource ThemeAccentBrush4}"/> |
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<Setter Property="Foreground" Value="{DynamicResource ThemeAccentBrush}"/> |
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<Setter Property="Template"> |
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<ControlTemplate> |
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<Border Background="{TemplateBinding Background}" |
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BorderBrush="{TemplateBinding BorderBrush}" |
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BorderThickness="{TemplateBinding BorderThickness}"> |
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<Grid> |
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<Border Name="PART_Track" |
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BorderThickness="1" |
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BorderBrush="{TemplateBinding Background}"/> |
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<Border Name="PART_Indicator" |
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BorderThickness="1" |
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Background="{TemplateBinding Foreground}"/> |
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</Grid> |
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</Border> |
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</ControlTemplate> |
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</Setter> |
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</Style> |
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<Styles xmlns="https://github.com/avaloniaui"> |
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<Style Selector="ProgressBar"> |
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<Setter Property="Background" Value="{DynamicResource ThemeAccentBrush4}"/> |
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<Setter Property="Foreground" Value="{DynamicResource ThemeAccentBrush}"/> |
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<Setter Property="Template"> |
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<ControlTemplate> |
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<Border Background="{TemplateBinding Background}" |
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BorderBrush="{TemplateBinding BorderBrush}" |
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BorderThickness="{TemplateBinding BorderThickness}"> |
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<Grid> |
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<Border Name="PART_Track" |
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BorderThickness="1" |
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BorderBrush="{TemplateBinding Background}"/> |
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<Border Name="PART_Indicator" |
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BorderThickness="1" |
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Background="{TemplateBinding Foreground}" /> |
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</Grid> |
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</Border> |
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</ControlTemplate> |
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</Setter> |
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</Style> |
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<Style Selector="ProgressBar:horizontal /template/ Border#PART_Indicator"> |
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<Setter Property="HorizontalAlignment" Value="Left"/> |
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<Setter Property="VerticalAlignment" Value="Stretch"/> |
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</Style> |
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<Style Selector="ProgressBar:vertical /template/ Border#PART_Indicator"> |
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<Setter Property="HorizontalAlignment" Value="Stretch"/> |
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<Setter Property="VerticalAlignment" Value="Bottom"/> |
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</Style> |
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<Style Selector="ProgressBar:horizontal"> |
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<Setter Property="MinWidth" Value="200"/> |
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<Setter Property="MinHeight" Value="14"/> |
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</Style> |
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<Style Selector="ProgressBar:vertical"> |
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<Setter Property="MinWidth" Value="14"/> |
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<Setter Property="MinHeight" Value="200"/> |
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</Style> |
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</Styles> |
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