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51 lines
1.4 KiB
51 lines
1.4 KiB
using System.Collections.ObjectModel;
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using DragNDrop.Model;
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namespace DragNDrop;
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public partial class OrganizeNounoursPage : ContentPage
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{
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public ObservableCollection<Nounours> NounoursCollection { get; set; } = new ObservableCollection<Nounours>()
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{
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new Nounours(42, "Chewbacca"),
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new Nounours(43, "Yoda"),
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new Nounours(44, "Ewok"),
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new Nounours(45, "Jabba the Hutt"),
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new Nounours(666, "Chucky")
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};
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public OrganizeNounoursPage()
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{
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InitializeComponent();
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BindingContext = this;
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}
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private void OnDragStarting(object sender, DragStartingEventArgs e)
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{
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e.Data.Properties["value"] = (sender as Element)?.BindingContext;
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}
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private void OnDrop(object sender, DropEventArgs e)
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{
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if ((sender as Element)?.BindingContext is not Nounours receivingElement) return;
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if (e.Data.Properties["value"] as Nounours is not Nounours draggedElement) return;
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int draggedIndex = NounoursCollection.IndexOf(draggedElement);
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if (draggedIndex > -1)
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{
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NounoursCollection.RemoveAt(draggedIndex);
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}
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int receivingIndex = NounoursCollection.IndexOf(receivingElement);
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if (receivingIndex == -1) throw new ArgumentNullException("There should be a receiving element");
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if (receivingIndex >= draggedIndex)
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{
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NounoursCollection.Insert(receivingIndex + 1, draggedElement);
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}
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else
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{
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NounoursCollection.Insert(receivingIndex, draggedElement);
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}
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}
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} |