Method HitTest

Source/Editor/GUI/Docking/DockPanel.cs:308–344

Performs hit test over dock panel Screen space position to test Dock panel that has been hit or null if nothing found

(ref Float2 position)

        /// <param name="position">Screen space position to test</param>
        /// <returns>Dock panel that has been hit or null if nothing found</returns>
        public DockPanel HitTest(ref Float2 position)
        {
            // Get parent window and transform point position into local coordinates system
            var parentWin = Root;
            if (parentWin == null)
                return null;
            var clientPos = parentWin.PointFromScreen(position);
            var localPos = PointFromWindow(clientPos);

            // Early out
            if (localPos.X < 0 || localPos.Y < 0)
                return null;
            if (localPos.X > Width || localPos.Y > Height)
                return null;

            // Test all docked controls (find the smallest one)
            float sizeLengthSquared = float.MaxValue;
            DockPanel result = null;
            for (int i = 0; i < _childPanels.Count; i++)
            {
                var panel = _childPanels[i].HitTest(ref position);
                if (panel != null)
                {
                    var sizeLen = panel.Size.LengthSquared;
                    if (sizeLen < sizeLengthSquared)
                    {
                        sizeLengthSquared = sizeLen;
                        result = panel;
                    }
                }
            }
            if (result != null)
                return result;

            // Itself
            return this;
        }

        /// <summary>
        /// Try get panel dock state