/// <summary>
/// Processes the dragging of the RichTextFormatBar
/// </summary>
private void ProcessMove(DragDeltaEventArgs e)
{
AdornerLayer layer = AdornerLayer.GetAdornerLayer(Target);
UIElementAdorner <Control> adorner = layer.GetAdorners(Target)[0] as UIElementAdorner <Control>;
adorner.SetOffsets(adorner.OffsetLeft + e.HorizontalChange, adorner.OffsetTop + e.VerticalChange);
}
/// <summary>
/// Positions the FormatBar so that is does not go outside the bounds of the RichTextBox or covers the selected text
/// </summary>
/// <param name="adorningEditor"></param>
private void PositionFormatBar(Control adorningEditor)
{
Point mousePosition = Mouse.GetPosition(_richTextBox);
double left = mousePosition.X;
double top = (mousePosition.Y - 15) - adorningEditor.ActualHeight;
//top
if (top < 0)
{
top = mousePosition.Y + 10;
}
//right boundary
if (left + adorningEditor.ActualWidth > _richTextBox.ActualWidth - 20)
{
left = left - (adorningEditor.ActualWidth - (_richTextBox.ActualWidth - left));
}
_adorner.SetOffsets(left, top);
}