public virtual void Drop(DropInfo dropInfo) { int insertIndex = dropInfo.InsertIndex; IList destinationList = GetList(dropInfo.TargetCollection); IEnumerable data = ExtractData(dropInfo.Data); if (dropInfo.DragInfo.VisualSource == dropInfo.VisualTarget) { IList sourceList = GetList(dropInfo.DragInfo.SourceCollection); foreach (object o in data) { int index = sourceList.IndexOf(o); if (index != -1) { sourceList.RemoveAt(index); if (sourceList == destinationList && index < insertIndex) { --insertIndex; } } } } foreach (object o in data) { destinationList.Insert(insertIndex++, o); } }
public virtual void DragOver(DropInfo dropInfo) { if (CanAcceptData(dropInfo)) { dropInfo.Effects = DragDropEffects.Copy; dropInfo.DropTargetAdorner = DropTargetAdorners.Insert; } }
protected virtual bool CanAcceptData(DropInfo dropInfo) { if (dropInfo.DragInfo.SourceCollection == dropInfo.TargetCollection) { return GetList(dropInfo.TargetCollection) != null; } else if (dropInfo.DragInfo.SourceCollection is ItemCollection) { return false; } else { if (TestCompatibleTypes(dropInfo.TargetCollection, dropInfo.Data)) { return !IsChildOf(dropInfo.VisualTargetItem, dropInfo.DragInfo.VisualSourceItem); } else { return false; } } }
static void DropTarget_PreviewDrop(object sender, DragEventArgs e) { DropInfo dropInfo = new DropInfo(sender, e, m_DragInfo, m_Format.Name); IDropTarget dropHandler = GetDropHandler((UIElement)sender); DragAdorner = null; DropTargetAdorner = null; if (dropHandler != null) { dropHandler.Drop(dropInfo); } else { DefaultDropHandler.Drop(dropInfo); } e.Handled = true; }
static void DropTarget_PreviewDragOver(object sender, DragEventArgs e) { DropInfo dropInfo = new DropInfo(sender, e, m_DragInfo, m_Format.Name); IDropTarget dropHandler = GetDropHandler((UIElement)sender); if (dropHandler != null) { dropHandler.DragOver(dropInfo); } else { DefaultDropHandler.DragOver(dropInfo); } // Update the drag adorner. if (dropInfo.Effects != DragDropEffects.None) { if (DragAdorner == null && m_DragInfo != null) { CreateDragAdorner(); } if (DragAdorner != null) { DragAdorner.MousePosition = e.GetPosition(DragAdorner.AdornedElement); DragAdorner.InvalidateVisual(); } } else { DragAdorner = null; } // If the target is an ItemsControl then update the drop target adorner. if (sender is ItemsControl) { UIElement adornedElement = ((ItemsControl)sender).GetVisualDescendent<ItemsPresenter>(); if (dropInfo.DropTargetAdorner == null) { DropTargetAdorner = null; } else if (!dropInfo.DropTargetAdorner.IsInstanceOfType(DropTargetAdorner)) { DropTargetAdorner = DropTargetAdorner.Create(dropInfo.DropTargetAdorner, adornedElement); } if (DropTargetAdorner != null) { DropTargetAdorner.DropInfo = dropInfo; DropTargetAdorner.InvalidateVisual(); } } e.Effects = dropInfo.Effects; e.Handled = true; Scroll((DependencyObject)sender, e); }
public void Drop(DropInfo dropInfo) { var droppedVM = dropInfo.Data; var targetVM = dropInfo.TargetItem; if (droppedVM is IHierarchy) { // preparing to refresh UI var sourceVM = droppedVM as HierarchyViewModelBase; var sourceParentVM = sourceVM.Parent; Task.Factory.StartNew(() => { ShowLoadingAnimation = true; ((IHierarchy)droppedVM).SetParent(null, targetVM); }) .ContinueWith(t => { if (t.Exception == null) { OnUIThread(() => { // refresh UI if (sourceParentVM != null) { sourceParentVM.LoadChildrens(); } else { RootKnowledgeGroups.Remove(droppedVM as KnowledgeGroupViewModel); } ((HierarchyViewModelBase)targetVM).LoadChildrens(); }); } ShowLoadingAnimation = false; }); } }
public void DragOver(DropInfo dropInfo) { bool canAcceptData = dropInfo.DragInfo != null; if (canAcceptData) { var realSourceItem = dropInfo.DragInfo.SourceItem as HierarchyViewModelBase; var realTargetItem = dropInfo.TargetItem as HierarchyViewModelBase; canAcceptData = realSourceItem != realTargetItem && realSourceItem is IKnowledgeGroupViewModel && (realTargetItem is IKnowledgeGroupViewModel || realTargetItem is IKnowledgeGroupViewModel) && realSourceItem.Parent != realTargetItem; //&& GetCatalogId(realSourceItem) == GetCatalogId(realTargetItem); if (canAcceptData) { dropInfo.Effects = System.Windows.DragDropEffects.Move; dropInfo.DropTargetAdorner = DropTargetAdorners.Highlight; } } }