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System.Application.SteamTools.Client.Desktop.Avalonia/Application/UI/DragDropUtil.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| using Avalonia.Input; | ||
| using System.Collections.Generic; | ||
|
|
||
| namespace System.Application.UI | ||
| { | ||
| /// <summary> | ||
| /// 拖拽功能工具类 | ||
| /// https://github.com/AvaloniaUI/Avalonia/blob/0.10.0-preview6/samples/ControlCatalog/Pages/DragAndDropPage.xaml.cs | ||
| /// </summary> | ||
| public static class DragDropUtil | ||
| { | ||
| public static void InitDragDrop(this IOnDragDropListener listener, | ||
| InputElement element) | ||
| { | ||
| element.PointerPressed += async (_, e) | ||
| => await DragDrop.DoDragDrop(e, new DataObject(), DragDropEffects.Copy); | ||
| element.AddHandler(DragDrop.DropEvent, Drop); | ||
| element.AddHandler(DragDrop.DragOverEvent, DragOver); | ||
|
|
||
| void DragOver(object? s, DragEventArgs? e) | ||
| { | ||
| if (e?.Data == null) return; | ||
| listener.DragOver(s is InputElement el ? el : element, e); | ||
| } | ||
|
|
||
| void Drop(object? s, DragEventArgs? e) | ||
| { | ||
| if (e?.Data == null) return; | ||
| listener.Drop(s is InputElement el ? el : element, e); | ||
| } | ||
| } | ||
|
|
||
| public static void InitDragDrop(this IOnDragDropListener listener, | ||
| IEnumerable<InputElement> elements) | ||
| { | ||
| foreach (var element in elements) | ||
| { | ||
| listener.InitDragDrop(element); | ||
| } | ||
| } | ||
|
|
||
| public static void InitDragDrop(this IOnDragDropListener listener, | ||
| params InputElement[] elements) | ||
| { | ||
| IEnumerable<InputElement> elements_ = elements; | ||
| listener.InitDragDrop(elements_); | ||
| } | ||
|
|
||
| public interface IOnDragDropListener | ||
| { | ||
| void DragOver(InputElement sender, DragEventArgs e) | ||
| { | ||
| // Only allow Copy or Link as Drop Operations. | ||
| e.DragEffects &= (DragDropEffects.Copy | DragDropEffects.Link); | ||
|
|
||
| // Only allow if the dragged data contains text or filenames. | ||
| if (!e.Data.Contains(DataFormats.Text) | ||
| && !e.Data.Contains(DataFormats.FileNames)) | ||
| e.DragEffects = DragDropEffects.None; | ||
| } | ||
|
|
||
| void Drop(InputElement sender, DragEventArgs e) | ||
| { | ||
| if (e.Data.Contains(DataFormats.Text)) | ||
| { | ||
| var text = e.Data.GetText(); | ||
| if (text != null) | ||
| { | ||
| DropText(sender, text); | ||
| } | ||
| } | ||
| else if (e.Data.Contains(DataFormats.FileNames)) | ||
| { | ||
| var fileNames = e.Data.GetFileNames(); | ||
| if (fileNames != null) | ||
| { | ||
| DropFileNames(sender, fileNames); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// 拖拽文本 | ||
| /// </summary> | ||
| /// <param name="sender"></param> | ||
| /// <param name="text"></param> | ||
| void DropText(InputElement sender, string text); | ||
|
|
||
| /// <summary> | ||
| /// 拖拽路径，路径可能是文件也可能是文件夹 | ||
| /// </summary> | ||
| /// <param name="sender"></param> | ||
| /// <param name="fileNames"></param> | ||
| void DropFileNames(InputElement sender, IEnumerable<string> fileNames); | ||
| } | ||
| } | ||
| } |
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