Beyhan Oğur
90 lines
2.8 KiB
C#
90 lines
2.8 KiB
C#
#region License
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// Copyright (C) 2020 Reetus
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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#endregion
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using System;
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using System.Collections.Specialized;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Interactivity;
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namespace ClassicAssist.UI.Misc
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{
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public class ItemsControlSelectNewEntryBehaviour : Behavior<ItemsControl>
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{
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public static readonly DependencyProperty SelectedItemProperty =
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DependencyProperty.Register( nameof( SelectedItem ), typeof( object ),
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typeof( ItemsControlSelectNewEntryBehaviour ),
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new FrameworkPropertyMetadata( default, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault ) );
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public static readonly DependencyProperty TypeProperty = DependencyProperty.Register( nameof( Type ),
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typeof( Type ), typeof( ItemsControlSelectNewEntryBehaviour ),
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new FrameworkPropertyMetadata( null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault ) );
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public object SelectedItem
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{
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get => GetValue( SelectedItemProperty );
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set => SetValue( SelectedItemProperty, value );
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}
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public Type Type
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{
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get => (Type) GetValue( TypeProperty );
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set => SetValue( TypeProperty, value );
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}
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protected override void OnAttached()
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{
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base.OnAttached();
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( (INotifyCollectionChanged) AssociatedObject.Items ).CollectionChanged += OnCollectionChanged;
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}
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protected override void OnDetaching()
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{
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base.OnDetaching();
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( (INotifyCollectionChanged) AssociatedObject.Items ).CollectionChanged -= OnCollectionChanged;
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}
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private void OnCollectionChanged( object sender, NotifyCollectionChangedEventArgs e )
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{
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if ( !( sender is ItemCollection ) )
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{
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return;
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}
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if ( e.NewItems == null )
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{
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return;
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}
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object firstItem = e.NewItems[0];
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if ( Type != null )
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{
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if ( firstItem.GetType() != Type )
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{
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return;
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}
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}
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SelectedItem = firstItem;
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}
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}
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} |