/// <summary>
/// This method is called repeatedly by <see cref="M:Northwoods.Go.GoBalloon.DoResize(Northwoods.Go.GoView,System.Drawing.RectangleF,System.Drawing.PointF,System.Int32,Northwoods.Go.GoInputState,System.Drawing.SizeF,System.Drawing.SizeF)" /> while
/// the user is dragging the <see cref="F:Northwoods.Go.GoBalloon.AnchorHandle" /> resize handle.
/// </summary>
/// <param name="p">the point (in document coordinates) currently specified by the user's mouse</param>
/// <param name="view"></param>
/// <param name="evttype"></param>
/// <remarks>
/// When <paramref name="evttype" /> is <c>GoInputState.</c><see cref="F:Northwoods.Go.GoInputState.Finish" />,
/// this calls <see cref="M:Northwoods.Go.GoView.PickObject(System.Boolean,System.Boolean,System.Drawing.PointF,System.Boolean)" /> to
/// find the selectable document object at the given point <paramref name="p" />.
/// The <see cref="P:Northwoods.Go.GoBalloon.Anchor" /> is set to that object.
/// If no object is found at that point, the <see cref="P:Northwoods.Go.GoBalloon.Anchor" /> is set to null
/// and the <see cref="P:Northwoods.Go.GoBalloon.UnanchoredOffset" /> is set to the offset between that
/// point and the <see cref="P:Northwoods.Go.GoComment.Label" />'s Position.
/// If the user tries to reanchor this balloon to itself, no change is made.
/// This method does nothing unless the <paramref name="evttype" /> is <see cref="F:Northwoods.Go.GoInputState.Finish" />.
/// </remarks>
protected virtual void PickNewAnchor(PointF p, GoView view, GoInputState evttype)
{
if (evttype != GoInputState.Finish)
{
return;
}
GoObject goObject = view.PickObject(doc: true, view: false, p, selectableOnly: true);
if (goObject == this)
{
return;
}
Anchor = goObject;
if (goObject == null)
{
if (Label != null)
{
UnanchoredOffset = GoTool.SubtractPoints(p, Label.Position);
}
else
{
UnanchoredOffset = GoTool.SubtractPoints(p, base.Position);
}
}
}