private void DragVisualHost_PointerMoved(object sender, PointerRoutedEventArgs e)
{
if (this.capturePending)
{
this.capturePending = false;
if (!this.EnsurePoinerCapture(e))
{
return;
}
}
var dragPoint = e.GetCurrentPoint(this.dragSurface.RootElement).Position;
this.dragVisualBounds = this.dragSurface.PositionDragHost(this.dragVisualContext, dragPoint, this.relativeStartPosition);
this.restrictedDragPoint = this.GetRestrictedPosition(dragPoint, this.dragVisualContext.PositionRestriction);
IDragDropElement newTarget = this.hitTestStrategy.GetTarget(this.dragVisualBounds, this.restrictedDragPoint);
if (this.targetElement != newTarget)
{
this.OnDragLeave();
this.targetElement = newTarget;
this.OnDragEnter();
}
else
{
this.OnDragOver();
}
this.OnDragging();
}
public DragDropOperation(DragStartingContext startContext, IDragDropElement source, DragPositionMode positionMode, Pointer pointer, Point startClickPosition, Point relativeStartPosition)
{
this.sourceElement = source;
this.dragSurface = startContext.DragSurface;
this.dragContext = new DragContext(startContext.Payload, this);
this.hitTestStrategy = startContext.HitTestStrategy ?? new DragHitTestStrategy(this.dragSurface.RootElement);
this.dragVisualContext = this.dragSurface.CreateDragContext();
this.dragVisualContext.DragStartPosition = new Point(startClickPosition.X - relativeStartPosition.X - startContext.DragVisual.Margin.Left, startClickPosition.Y - relativeStartPosition.Y - startContext.DragVisual.Margin.Top);
this.dragVisualContext.PositionRestriction = positionMode;
this.dragVisualContext.PrepareDragVisual(startContext.DragVisual);
this.startDragPosition = startClickPosition;
this.relativeStartPosition = relativeStartPosition;
this.InitializeVisual();
this.dragVisualContext.DragVisualHost.PointerMoved += this.DragVisualHost_PointerMoved;
this.dragVisualContext.DragVisualHost.PointerReleased += this.DragVisualHost_PointerReleased;
this.dragVisualContext.DragVisualHost.PointerCaptureLost += this.DragVisualHost_PointerCaptureLost;
if (pointer != null && this.dragVisualContext.DragVisualHost.CapturePointer(pointer))
{
this.capturedPointer = pointer;
this.originalFocusedElement = FocusManager.GetFocusedElement() as Control;
if (this.originalFocusedElement != null)
{
this.originalFocusState = this.originalFocusedElement.FocusState;
}
((Control)this.dragVisualContext.DragVisualHost).Focus(FocusState.Programmatic);
}
else if (pointer != null)
{
this.CancelDrag();
}
else
{
this.capturePending = true;
}
this.dragSurface.RootElement.KeyDown += this.RootElement_KeyDown;
}
public ReorderListViewItemHitTestStrategy(IDragDropElement source, UIElement rootElement)
: base(rootElement)
{
this.source = source;
}
public ColumnHeaderHittestStrategy(IDragDropElement source, UIElement rootElement)
: base(rootElement)
{
this.source = source;
}