Assign a callback function to be notified whenever a page requests a file
chooser dialog to be displayed (usually the result of an "input" element
with type "file" being clicked by a user). You will need to display your
own dialog (it does not have to be modal, this request does not block).
Once a file has been chosen by the user, awe_webview_choose_file or
awe_webview_choose_multiple_files should be called.
@param webview The WebView instance.
@param callback A function pointer to the callback.
Assign a callback function to be notified whenever a page requests a file chooser dialog to be displayed (usually the result of an "input" element with type "file" being clicked by a user). You will need to display your own dialog (it does not have to be modal, this request does not block). Once a file has been chosen by the user, awe_webview_choose_file or awe_webview_choose_multiple_files should be called.
@param webview The WebView instance.
@param callback A function pointer to the callback.