45 lines
1.3 KiB
C#
45 lines
1.3 KiB
C#
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using System.Windows;
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using Microsoft.Xaml.Behaviors;
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/// <summary>
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/// 拖拽文件事件
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/// </summary>
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/// <example>DropFileBehaviors Data="{Binding FileNames,Mode=OneWayToSource}"从依赖属性传到源属性，通过源属性实现Mvvm</example>
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/// <remarks>设置窗口属性AllowDrop，在上层覆盖一个面板如Grid，设置窗口的DropEnter和DropLeave(EventTrigger)事件，控制其显隐以及控制Drop事件后隐藏(ChangePropertyAction)</remarks>
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class DropFileBehavior : Behavior<FrameworkElement>
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{
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public string[] Data
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{
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get { return (string[])GetValue(DataProperty); }
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set { SetValue(DataProperty, value); }
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}
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public static readonly DependencyProperty DataProperty =
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DependencyProperty.Register(nameof(Data), typeof(string[]), typeof(DropFileBehavior), new PropertyMetadata(null));
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protected override void OnAttached()
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{
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AssociatedObject.AllowDrop = true;
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AssociatedObject.Drop += DropHandler;
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}
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private void DropHandler(object sender, DragEventArgs e)
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{
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if (e.Data.GetDataPresent(DataFormats.FileDrop))
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{
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Data = (string[])e.Data.GetData(DataFormats.FileDrop);
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}
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}
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protected override void OnDetaching()
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{
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AssociatedObject.Drop -= DropHandler;
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}
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protected override void OnChanged()
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{
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base.OnChanged();
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}
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} |