void DropTargetBase_DropTargetLeft(object sender, DropEventArgs args) { if (DragSourceIsHovering) { // set value of boolean DragSourceIsHovering = false; if (ShowHover) { // hide control Animation.CreateDropTargetHoverOut(BoundingBorder).Begin(); } } }
void DropTargetBase_DropTargetEntered(object sender, DropEventArgs args) { if (!DragSourceIsHovering) { // set value of boolean DragSourceIsHovering = true; if (ShowHover) { // show control Animation.CreateDropTargetHoverIn(BoundingBorder).Begin(); } } }
/// <summary> /// Handles the dropping of a dragsource in this droptarget /// </summary> /// <param name="sender"></param> /// <param name="args"></param> void DropTargetBase_InternalDragSourceDropped(object sender, DropEventArgs args) { if (ShowHover) { // after this, start the hover-out animation on the droptarget Animation.CreateDropTargetHoverOut(BoundingBorder).Begin(); } // what if there are children? if (MainContentControl.Children.Count > 0) { // get the current child (which is a dragsource by definition) // and either switch it with the new child (if the parent of the new child // is a valid droptarget for the current child - so it must have rights to // be used as a droptarget to be able to make the switch!) or replace it DragSource currentChild = (DragSource)MainContentControl.Children[0]; // if currentchild <> child you're dragging (else, we're just dropping our // dragsource onto its own parent (droptarget) if (currentChild != args.DragSource) { // is the new childs' parent (parent of parent of parent) a droptarget? Panel firstParent = (Panel)VisualTreeHelper.GetParent(VisualTreeHelper.GetParent(args.DragSource)); if (firstParent != null) { // droptarget? if (VisualTreeHelper.GetParent(firstParent) is DropTarget) { DropTarget newChildParentDropTarget = (DropTarget)VisualTreeHelper.GetParent(firstParent); if (currentChild.DropTargets.Contains(newChildParentDropTarget) || currentChild.AllDropTargetsValid == true) // check for valid droptarget, or check if all droptargets are valid { // point needed for animation of the current child Point from = new Point(); from = args.DragSource.getCurrentPosition(); Point offsetCurrentChild = new Point(); if (currentChild.ShowSwitchReplaceAnimation) { offsetCurrentChild = currentChild.MainDraggableControl.TransformToVisual(InitialValues.ContainingLayoutPanel).Transform(new Point(0, 0)); } Point oriOffset = new Point(args.DragSource.OriginalOffset.X, args.DragSource.OriginalOffset.Y); // reset position of dragsource, so control is on top of ghost, right // before actually moving it. args.DragSource.ResetMyPosition(); // remove from current parent ((Panel)VisualTreeHelper.GetParent(args.DragSource)).Children.Remove(args.DragSource); MainContentControl.Children.Clear(); MainContentControl.Children.Add(args.DragSource); // move the current child, with or without an animation if (currentChild.ShowSwitchReplaceAnimation) { // animation, from the current position to the new position // current position = where the new child is now // new position = where the new child was // add the current child to its new position, then move it from the // "current position" to 0, 0 (the new position) newChildParentDropTarget.MainContentControl.Children.Add(currentChild); //currentChild.AnimateOnSwitch(from); Storyboard sb = currentChild.ReturnAnimateOnSwitch(offsetCurrentChild, oriOffset); EventHandler handler = null; handler = (send, arg) => { sb.Completed -= handler; currentChild.ResetMyPosition(); // trigger external dragsourcedropped-event TriggerDragSourceDropped(args.DragSource); }; sb.Completed += handler; sb.Begin(); } else { // no animation newChildParentDropTarget.MainContentControl.Children.Add(currentChild); // trigger external dragsourcedropped-event TriggerDragSourceDropped(args.DragSource); } } else { // parent of the new child isn't a VALID droptarget. Depending on DropBehaviour, remove // current child & set new one (replace-behaviour) or return the new child to // its original position (disallow-behaviour) if (RemoveElementDropBehaviour == RemoveElementDropBehaviour.Replace) { // reset position of dragsource, so control is on top of ghost, right // before actually moving it. args.DragSource.ResetMyPosition(); // remove from current parent ((Panel)VisualTreeHelper.GetParent(args.DragSource)).Children.Remove(args.DragSource); MainContentControl.Children.Clear(); MainContentControl.Children.Add(args.DragSource); // trigger external dragsourcedropped-event TriggerDragSourceDropped(args.DragSource); } else { // drop is disallowed, return dragsource to original position args.DragSource.ReturnToOriginalPosition(); // trigger external dragsourcedropped-event TriggerDragSourceDropped(args.DragSource); } } } else { // parent of the new child isn't a droptarget. Depending on DropBehaviour, remove // current child & set new one (replace-behaviour) or return the new child to // its original position (disallow-behaviour) if (RemoveElementDropBehaviour == RemoveElementDropBehaviour.Replace) { // reset position of dragsource, so control is on top of ghost, right // before actually moving it. args.DragSource.ResetMyPosition(); // remove from current parent ((Panel)VisualTreeHelper.GetParent(args.DragSource)).Children.Remove(args.DragSource); MainContentControl.Children.Clear(); MainContentControl.Children.Add(args.DragSource); // trigger external dragsourcedropped-event TriggerDragSourceDropped(args.DragSource); } else { // drop is disallowed, return dragsource to original position args.DragSource.ReturnToOriginalPosition(); // trigger external dragsourcedropped-event TriggerDragSourceDropped(args.DragSource); } } } else { // reset position of dragsource, so control is on top of ghost, right // before actually moving it. args.DragSource.ResetMyPosition(); // remove from current parent ((Panel)VisualTreeHelper.GetParent(args.DragSource)).Children.Remove(args.DragSource); MainContentControl.Children.Clear(); MainContentControl.Children.Add(args.DragSource); // trigger external dragsourcedropped-event TriggerDragSourceDropped(args.DragSource); } } else { // reset position of dragsource, so control is on top of ghost, right // before actually moving it. args.DragSource.ResetMyPosition(); // trigger external dragsourcedropped-event TriggerDragSourceDropped(args.DragSource); } } else { // reset position of dragsource, so control is on top of ghost, right // before actually moving it. args.DragSource.ResetMyPosition(); // remove from current parent ((Panel)VisualTreeHelper.GetParent(args.DragSource)).Children.Remove(args.DragSource); MainContentControl.Children.Clear(); MainContentControl.Children.Add(args.DragSource); ((DropTarget)VisualTreeHelper.GetParent((Panel)VisualTreeHelper.GetParent(VisualTreeHelper.GetParent(args.DragSource)))).Content = null; this.Content = args.DragSource; // trigger external dragsourcedropped-event TriggerDragSourceDropped(args.DragSource); } }