private void InitializeDrag(Point dragStartPosition)
{
SceneViewModel viewModel = this.ActiveView.ViewModel;
this.CreateSubTransaction();
this.dragStartPosition = dragStartPosition;
this.ComputeDraggedElements();
if (this.draggedElements == null || this.draggedElements.Count == 0)
{
this.moveStrategy = (MoveStrategy)null;
this.dragContainer = (BaseFrameworkElement)null;
this.CancelDrag();
}
else
{
this.moveStrategy = (MoveStrategy)null;
this.moveStrategyContext = MoveStrategyContext.FromSelection((ToolBehavior)this, this.primarySelection, this.selectedElements, this.draggedElements, this.DuplicationOffset, this.dragStartPosition);
this.dragContainer = (BaseFrameworkElement)null;
bool flag = false;
SceneElement sceneElement1 = (SceneElement)null;
foreach (SceneElement sceneElement2 in (IEnumerable <SceneElement>) this.selectedElements)
{
BaseFrameworkElement frameworkElement = (BaseFrameworkElement)null;
BaseFrameworkElement editingContainer = viewModel.FindPanelClosestToActiveEditingContainer();
if (editingContainer != null && editingContainer.IsAncestorOf((SceneNode)sceneElement2))
{
frameworkElement = editingContainer;
}
if (!flag)
{
flag = true;
this.dragContainer = frameworkElement;
sceneElement1 = sceneElement2.ParentElement;
}
else if (sceneElement2.ParentElement != sceneElement1)
{
this.dragContainer = (BaseFrameworkElement)null;
break;
}
if (frameworkElement != this.dragContainer)
{
this.dragContainer = (BaseFrameworkElement)null;
break;
}
}
if (this.dragContainer != null)
{
this.moveStrategy = MoveStrategyFactory.Create(this.moveStrategyContext, this.draggedElements[0].ParentElement, this.IsShiftDown);
if (this.moveStrategy != null)
{
this.moveStrategy.BeginDrag(dragStartPosition);
this.ToolBehaviorContext.SnappingEngine.Start(this.ToolBehaviorContext, this.primaryDraggedElement, this.draggedElements);
}
else
{
this.CancelDrag();
}
}
else
{
this.CancelDrag();
}
}
}
private bool InternalOnDrag(Point dragStartPosition, Point dragCurrentPosition, bool scrollNow)
{
if (this.dragCancelled)
{
return(true);
}
this.EnsureEditTransaction();
if (!this.HasMouseMovedAfterDown)
{
this.InitializeDrag(dragStartPosition);
}
if (this.dragCancelled || this.dragContainer == null)
{
return(true);
}
Point point = dragCurrentPosition;
dragCurrentPosition = this.SnapPrimarySelectionBounds(dragStartPosition, dragCurrentPosition);
Point dragStartPosition1 = dragStartPosition;
this.dragCurrentPosition = dragCurrentPosition;
Vector vector = this.dragCurrentPosition - this.dragStartPosition;
this.ActiveView.EnsureVisible(dragStartPosition + vector, scrollNow);
BaseFrameworkElement hitElement = this.GetHitElement(point, this.draggedElements) ?? this.dragContainer;
if (this.ActiveSceneViewModel.FindPanelClosestToRoot() != this.dragContainer || hitElement.GetType() == typeof(Viewport3DElement))
{
hitElement = this.dragContainer;
}
MoveStrategy moveStrategy = MoveStrategyFactory.Create(this.moveStrategyContext, (SceneElement)hitElement, this.IsShiftDown);
bool flag = this.enableReparenting && this.moveStrategy != null && (moveStrategy != null && moveStrategy.LayoutContainer != null) && moveStrategy.LayoutContainer != this.moveStrategy.LayoutContainer && moveStrategy.LayoutContainer.IsViewObjectValid;
if (flag && this.IsAltDown)
{
this.ProvisionalContainer = (BaseFrameworkElement)null;
this.ToolBehaviorContext.SnappingEngine.Stop();
this.moveStrategy.EndDrag(false);
this.ReplaceSubTransaction();
this.UpdateEditTransaction();
if (moveStrategy != null)
{
this.moveStrategy = moveStrategy;
this.moveStrategy.BeginDrag(dragStartPosition1);
if (!this.moveStrategy.LayoutContainer.IsViewObjectValid)
{
this.CancelDrag();
return(true);
}
this.moveStrategy.ContinueDrag(dragCurrentPosition, hitElement);
this.ToolBehaviorContext.SnappingEngine.Start(this.ToolBehaviorContext, this.primaryDraggedElement, this.draggedElements);
}
}
else if (moveStrategy != null)
{
if (!flag)
{
this.ProvisionalContainer = (BaseFrameworkElement)null;
}
else
{
this.ProvisionalContainer = moveStrategy.LayoutContainer;
this.SetTextCuePosition(dragCurrentPosition);
}
if (this.moveStrategy == null)
{
this.moveStrategy = moveStrategy;
this.moveStrategy.BeginDrag(dragStartPosition);
this.ToolBehaviorContext.SnappingEngine.Start(this.ToolBehaviorContext, this.primaryDraggedElement, this.draggedElements);
}
this.moveStrategy.ContinueDrag(dragCurrentPosition, hitElement);
}
else if (this.moveStrategy != null)
{
this.moveStrategy.ContinueDrag(dragCurrentPosition, hitElement);
}
this.UpdateEditTransaction();
if (this.moveStrategy != null && !this.moveStrategy.LayoutContainer.IsViewObjectValid)
{
this.CancelDrag();
}
return(true);
}