LayoutFarm.Composers.EaseScriptElement.ChangeBackgroundColor C# (CSharp) Method

        public void ChangeBackgroundColor(Color backgroundColor)
        {
            if (elem == null)
            {
                return;
            }
            BoxSpec boxSpec = elem.Spec;
            if (boxSpec.BackgroundColor == backgroundColor)
            {
                return;
            }


            var existingRuleSet = elem.ElementRuleSet;
            if (existingRuleSet == null)
            {
                //create new one                     
                elem.ElementRuleSet = existingRuleSet = new CssRuleSet();
                elem.IsStyleEvaluated = false;
            }

            //-------------------------------------
            existingRuleSet.RemoveCssProperty(WellknownCssPropertyName.BackgroundColor);
            existingRuleSet.AddCssCodeProperty(
               new CssPropertyDeclaration(
                   WellknownCssPropertyName.BackgroundColor,
                   new CssCodeColor(CssColorConv.ConvertToCssColor(backgroundColor))));
            elem.SkipPrincipalBoxEvalulation = false;
            CssBox cssbox = HtmlElement.InternalGetPrincipalBox(elem);
            if (cssbox != null)
            {
#if DEBUG
                cssbox.dbugMark1++;
#endif

                CssBox.InvalidateComputeValue(cssbox);
            }

            HtmlElement.InvokeNotifyChangeOnIdleState(
               elem,
               ElementChangeKind.Spec);
            InvalidateCssBox(cssbox);
        }
        static void InvalidateCssBox(CssBox cssbox)

        public override DomElement GetPresentationDomNode(WebDom.Impl.HtmlDocument htmldoc)
        {
            if (pnode != null) return pnode;
            //----------------------------------
            pnode = htmldoc.CreateElement("div");
            pnode.SetAttribute("style", "display:inline-block;width:" + Width + "px;height:" + this.Height + "px;");
            pnode.AddChild("div", div2 =>
            {
                //init
                div2.SetAttribute("style", "padding:5px;background-color:#dddddd;");
                div2.AddChild("span", span =>
                {
                    span.AddTextContent(this.buttonText);
                });
                //------------------------------

                div2.AttachMouseDownEvent(e =>
                {
#if DEBUG
                    div2.dbugMark = 1;
#endif
                    // div2.SetAttribute("style", "padding:5px;background-color:#aaaaaa;");
                    EaseScriptElement ee = new EaseScriptElement(div2);
                    ee.ChangeBackgroundColor(Color.FromArgb(0xaa, 0xaa, 0xaa));
                    //div2.SetAttribute("style", "padding:5px;background-color:#aaaaaa;");
                    e.StopPropagation();
                });
                div2.AttachMouseUpEvent(e =>
                {
#if DEBUG
                    div2.dbugMark = 2;
#endif
                    //div2.SetAttribute("style", "padding:5px;background-color:#dddddd;");

                    EaseScriptElement ee = new EaseScriptElement(div2);
                    ee.ChangeBackgroundColor(Color.FromArgb(0xdd, 0xdd, 0xdd));
                    e.StopPropagation();
                });
            });
            return pnode;
        }