LayoutFarm.HtmlBoxes.SelectionRange.SelectionRange C# (CSharp) Method

        public SelectionRange(
            CssBoxHitChain startChain,
            CssBoxHitChain endChain,
            IFonts ifonts)
        {
            if (IsOnTheSameLine(startChain, endChain))
            {
                //on the same line
                if (endChain.RootGlobalX < startChain.RootGlobalX)
                {
                    //swap
                    var tmp = endChain;
                    endChain = startChain;
                    startChain = tmp;
                }
            }
            else
            {
                //across line 
                if (endChain.RootGlobalY < startChain.RootGlobalY)
                {    //swap
                    var tmp = endChain;
                    endChain = startChain;
                    startChain = tmp;
                }
            }

            //1.
            this.SetupStartHitPoint(startChain, ifonts);
            //2. 
            if (this.startHitHostLine == null)
            {
                this.isValid = false;
                return;
            }


            this.SetupEndHitPoint(startChain, endChain, ifonts);
            this.snapSelectionArea = this.GetSelectionRectArea();
        }
        public Rectangle SnapSelectionArea { get { return this.snapSelectionArea; } }