I found a solution adopting
http://stackoverflow.com/questions/10317644/how-to-make-gwts-richtextarea-detect-content-pasting-and-cutting-events
IFrameElement iFrame = IFrameElement.as(richTextArea.getElement());
>
>
> //listen for paste event
> addDropHandler(iFrame);
>
> /**
> * Add a listener for the paste event
> * @param iframe
> */
> private native void addDropHandler(IFrameElement iframe)
> /*-{
> if(iframe == null)
> return;
>
> var _this = this;
>
> var pasteFunction = function(e)
> {
> [email protected]::handleDrop()();
> }
> if (iframe.contentWindow)
> iframe.contentWindow.addEventListener('drop', pasteFunction, true);
>
> }-*/;
>
> public void handleDrop() {
> Window.alert("Drop!");
> }
>
>
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