OpenTween.TweenMain.SplitContainer3_SplitterMoved C# (CSharp) Method

        private void SplitContainer3_SplitterMoved(object sender, SplitterEventArgs e)
        {
            if (this._initialLayout)
                return;

            int splitterDistance;
            switch (this.WindowState)
            {
                case FormWindowState.Normal:
                    splitterDistance = this.SplitContainer3.SplitterDistance;
                    break;
                case FormWindowState.Maximized:
                    // 最大化時は、通常時のウィンドウサイズに換算した SplitterDistance を算出する
                    var normalContainerWidth = this._mySize.Width - SystemInformation.Border3DSize.Width * 2;
                    splitterDistance = this.SplitContainer3.SplitterDistance - (this.SplitContainer3.Width - normalContainerWidth);
                    splitterDistance = Math.Min(splitterDistance, normalContainerWidth - this.SplitContainer3.SplitterWidth - this.SplitContainer3.Panel2MinSize);
                    break;
                default:
                    return;
            }

            this._mySpDis3 = splitterDistance;
            this.ModifySettingLocal = true;
        }