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set_accept() for Combox and Textbox

Apr 15, 2014 at 6:45 PM
The new set_accept() method is used for specifying a function to determine whether the keyboard input is accepted. For example, a textbox only accepts digital input.
textbox.set_accept([](nana::char_t ch)
    return ('0' <= ch && ch <= '9');
The prototype of set_accept() is: