116 lines
3.4 KiB
C#
116 lines
3.4 KiB
C#
using System.Collections.ObjectModel;
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using System.Collections.Specialized;
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using System.ComponentModel;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Data;
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using System.Windows.Markup;
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using System.Windows.Media.Effects;
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namespace HandyControl.Controls;
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[DefaultProperty("Content")]
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[ContentProperty("Content")]
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public class BlendEffectBox : Control
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{
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private readonly ContentPresenter _effectBottomPresenter;
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private readonly ContentPresenter _effectTopPresenter;
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private bool _isInternalAction;
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public BlendEffectBox()
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{
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_effectTopPresenter = new ContentPresenter();
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ActualContent = _effectTopPresenter;
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_effectBottomPresenter = new ContentPresenter();
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_effectBottomPresenter.SetBinding(ContentPresenter.ContentProperty, new Binding(ContentProperty.Name)
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{
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Source = this
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});
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var effects = new ObservableCollection<Effect>();
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effects.CollectionChanged += OnEffectsChanged;
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Effects = effects;
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}
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private void OnEffectsChanged(object sender, NotifyCollectionChangedEventArgs e)
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{
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if (Effects == null || Effects.Count == 0)
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{
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ClearEffect(_effectTopPresenter);
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return;
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}
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if (_isInternalAction) return;
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_isInternalAction = true;
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AddEffect(_effectTopPresenter, Effects.Count);
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_isInternalAction = false;
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}
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private void ClearEffect(ContentPresenter presenter)
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{
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if (presenter == null) return;
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if (ReferenceEquals(_effectBottomPresenter, presenter))
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{
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_effectBottomPresenter.SetCurrentValue(EffectProperty, null);
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return;
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}
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presenter.SetCurrentValue(EffectProperty, null);
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ClearEffect(presenter.Content as ContentPresenter);
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}
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private void AddEffect(ContentPresenter presenter, int count)
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{
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var newCount = --count;
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if (newCount >= 0)
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{
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presenter.Effect = Effects[newCount];
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var nextCount = --count;
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if (nextCount >= 1)
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{
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var content = new ContentPresenter();
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presenter.Content = content;
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AddEffect(content, newCount);
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}
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else if (nextCount >= 0)
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{
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_effectBottomPresenter.Effect = Effects[0];
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presenter.Content = _effectBottomPresenter;
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}
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else
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{
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presenter.Content = _effectBottomPresenter;
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}
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}
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}
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[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
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[Bindable(true)]
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public Collection<Effect> Effects { get; }
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public static readonly DependencyProperty ContentProperty = DependencyProperty.Register(
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"Content", typeof(FrameworkElement), typeof(BlendEffectBox), new PropertyMetadata(default(FrameworkElement)));
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public FrameworkElement Content
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{
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get => (FrameworkElement) GetValue(ContentProperty);
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set => SetValue(ContentProperty, value);
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}
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internal static readonly DependencyProperty ActualContentProperty = DependencyProperty.Register(
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"ActualContent", typeof(FrameworkElement), typeof(BlendEffectBox), new PropertyMetadata(default(FrameworkElement)));
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internal FrameworkElement ActualContent
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{
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get => (FrameworkElement) GetValue(ActualContentProperty);
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set => SetValue(ActualContentProperty, value);
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}
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}
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