private void ProductionGraphViewer_MouseMove(object sender, MouseEventArgs e)
{
var element = GetElementsAtPoint(ScreenToGraph(e.Location)).FirstOrDefault();
if (element != null)
{
element.MouseMoved(Point.Add(ScreenToGraph(e.Location), new Size(-element.X, -element.Y)));
}
if (DraggedElement != null)
{
Point dragDiff = Point.Add(Control.MousePosition, new Size(-dragStartScreenPoint.X, -dragStartScreenPoint.Y));
if (dragDiff.X * dragDiff.X + dragDiff.Y * dragDiff.Y > 9) //Only drag if the mouse has moved more than three pixels. This avoids dragging when the user is trying to click.
{
clickHasBecomeDrag = true;
DraggedElement.Dragged(Point.Add(ScreenToGraph(e.Location), new Size(-DraggedElement.X, -DraggedElement.Y)));
}
}
if ((Control.MouseButtons & MouseButtons.Middle) != 0 ||
((Control.MouseButtons & MouseButtons.Left) != 0 && DraggedElement == null))
{
ViewOffset = new Point(ViewOffset.X + (int)((e.X - lastMouseDragPoint.X) / ViewScale), ViewOffset.Y + (int)((e.Y - lastMouseDragPoint.Y) / ViewScale));
LimitViewToBounds();
lastMouseDragPoint = e.Location;
}
Invalidate();
}
private void StartDragging(object sender, MouseButtonEventArgs e)
{
HitTestResult hitResult = VisualTreeHelper.HitTest(this, e.GetPosition(this));
if (!(GetParent(hitResult.VisualHit, 1) is Border element))
{
return;
}
mDragged = new DraggedElement()
{
Dragged = element,
DraggingPoint = new Point(Canvas.GetLeft(element), Canvas.GetTop(element)),
PickUpMousePoint = e.GetPosition(this),
PickUpPoint = new Point(Canvas.GetLeft(element), Canvas.GetTop(element))
};
Panel.SetZIndex(element, int.MaxValue);
CaptureMouse();
}
