Assign a callback function to be notified when an external link is attempted
to be opened. An external link is any link that normally opens in a new
window in a standard browser (for example, links with target="_blank",
calls to window.open(url), and URL open events from Flash plugins).
@param webview The WebView instance.
@param callback A function pointer to the callback.
Assign a callback function to be notified when an external link is attempted to be opened. An external link is any link that normally opens in a new window in a standard browser (for example, links with target="_blank", calls to window.open(url), and URL open events from Flash plugins).
@param webview The WebView instance.
@param callback A function pointer to the callback.