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Merge pull request #143 from alexandrehtrb/samples/datagrid-drag-and-…
…drop samples: add sample for DataGrid drag-and-drop
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79 changes: 79 additions & 0 deletions
79
samples/DragAndDropSample/Behaviors/ItemsDataGridDropHandler.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| using Avalonia.Controls; | ||
| using Avalonia.Input; | ||
| using Avalonia.VisualTree; | ||
| using Avalonia.Xaml.Interactions.DragAndDrop; | ||
| using DragAndDropSample.ViewModels; | ||
|
|
||
| namespace DragAndDropSample.Behaviors; | ||
|
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| public class ItemsDataGridDropHandler : DropHandlerBase | ||
| { | ||
| private bool Validate<T>(DataGrid dg, DragEventArgs e, object? sourceContext, object? targetContext, bool bExecute) where T : ItemViewModel | ||
| { | ||
| if (sourceContext is not T sourceItem | ||
| || targetContext is not MainWindowViewModel vm | ||
| || dg.GetVisualAt(e.GetPosition(dg)) is not Control targetControl | ||
| || targetControl.DataContext is not T targetItem) | ||
| { | ||
| return false; | ||
| } | ||
|
|
||
| var items = vm.Items; | ||
| var sourceIndex = items.IndexOf(sourceItem); | ||
| var targetIndex = items.IndexOf(targetItem); | ||
|
|
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| if (sourceIndex < 0 || targetIndex < 0) | ||
| { | ||
| return false; | ||
| } | ||
|
|
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| switch (e.DragEffects) | ||
| { | ||
| case DragDropEffects.Copy: | ||
| { | ||
| if (bExecute) | ||
| { | ||
| var clone = new ItemViewModel() { Title = sourceItem.Title + "_copy" }; | ||
| InsertItem(items, clone, targetIndex + 1); | ||
| } | ||
| return true; | ||
| } | ||
| case DragDropEffects.Move: | ||
| { | ||
| if (bExecute) | ||
| { | ||
| MoveItem(items, sourceIndex, targetIndex); | ||
| } | ||
| return true; | ||
| } | ||
| case DragDropEffects.Link: | ||
| { | ||
| if (bExecute) | ||
| { | ||
| SwapItem(items, sourceIndex, targetIndex); | ||
| } | ||
| return true; | ||
| } | ||
| default: | ||
| return false; | ||
| } | ||
| } | ||
|
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| public override bool Validate(object? sender, DragEventArgs e, object? sourceContext, object? targetContext, object? state) | ||
| { | ||
| if (e.Source is Control && sender is DataGrid dg) | ||
| { | ||
| return Validate<ItemViewModel>(dg, e, sourceContext, targetContext, false); | ||
| } | ||
| return false; | ||
| } | ||
|
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| public override bool Execute(object? sender, DragEventArgs e, object? sourceContext, object? targetContext, object? state) | ||
| { | ||
| if (e.Source is Control && sender is DataGrid dg) | ||
| { | ||
| return Validate<ItemViewModel>(dg, e, sourceContext, targetContext, true); | ||
| } | ||
| return false; | ||
| } | ||
| } |
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