trying to find out the cursor index in GWT RichTextArea

getCursor  is available in GWT textarea and workd perfectly but I need to make the selected text Colored , Thats Why I am switching to RichTextArea .

If there is anyway i can give color to the text of TextArea please suggest 

if not Please guide me how to get cursor position in GWt RichtextArea.

I found One Solution using Javascript .(JSNI) with below code.

But its giving me the cursor position as per each line , for example If I am on 1st line of my RichtextArea on 6th word it will say "6"(which is correct), but if I am on my 6th word on 3rd line it will again say "6" which is Wrong , That index should be the total of all three rows text.

Can you please modify this Javascript or give me any other solution 

I have not much experience with Javascript

public static native int getSelection(Element elem) /*-{

                                                   var txt = "";

                                                   var pos = 0;

                                                   var range;

                                                   var parentElement;

                                                   var container;

                                                

                                                   if (elem.contentWindow.getSelection) {

                                                   txt = elem.contentWindow.getSelection();

                                                   pos = elem.contentWindow.getSelection().getRangeAt(0).startOffset;

                                                   } else if (elem.contentWindow.document.getSelection) {

                                                   txt = elem.contentWindow.document.getSelection();

                                                   pos = elem.contentWindow.document.getSelection().getRangeAt(0).startOffset;

                                                   } else if (elem.contentWindow.document.selection) {

                                                   range = elem.contentWindow.document.selection.createRange();

                                                   txt = range.text;

                                                   parentElement = range.parentElement();

                                                   container = range.duplicate();

                                                   container.moveToElementText(parentElement);

                                                   container.setEndPoint('EndToEnd', range);

                                                   pos = container.text.length - range.text.length;

                                                   }

                                                   return pos;

                                                   }-*/; 

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