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function string = GetString(useKbCheck, varargin)
% string = GetString([useKbCheck=0][, deviceIndex][, untilTime=inf][, optional KbCheck arguments...])
%
% Get a string typed at the keyboard. Entry is terminated by
% <return> or <enter>.
%
% If the optional flag 'useKbCheck' is set to 1 then KbCheck is used - with
% potential optional additional 'KbCheck args...' for getting the string
% from the keyboard. Otherwise GetChar is used. 'useKbCheck' == 1 is
% restricted to standard alpha-numeric keys (characters, letters and a few
% special symbols). It can't handle all possible characters and doesn't
% work with non-US keyboard mappings. Its advantage is that it works
% reliably on configurations where GetChar may fail, e.g., on MS-Vista and
% Windows-7.
%
% Useful for i/o in a Screen window. Typed keys are not echoed.
%
% See also: GetEchoString, GetNumber, GetEchoNumber
%
% 12/7/95 dhb Wrote GetNumber in response to query from Tina Beard.
% 12/8/95 dhb Add delete functionality.
% 2/4/97 dhb Fixed bug. Can now hit delete more than once.
% 2/5/97 dhb Accept <enter> as well as <cr>.
% dhb Allow string return as well.
% 3/15/97 dgp Created GetString based on dhb's GetNumber.
% 3/31/97 dhb Fix bug arising from new initialization.
% 2/28/98 dgp Use GetChar instead of obsolete GetKey. Use SWITCH and LENGTH.
% 3/27/98 dhb Fix bug from 2/28/98, put abs around char in switch.
% 12/19/06 mk Adapted for use with PTB-3.
% 10/22/10 mk Optionally allow to use KbGetChar for keyboard input.
string = '';
if nargin < 1
useKbCheck = [];
end
if isempty(useKbCheck)
useKbCheck = 0;
end
if ~useKbCheck
% Flush the keyboard buffer:
FlushEvents;
end
while 1 % Loop until <return> or <enter>
if useKbCheck
char = GetKbChar(varargin{:});
else
char = GetChar;
end
if isempty(char)
string = '';
return;
end
switch(abs(char))
case {13,3,10}, % <return> or <enter>
break;
case 8, % <delete>
if ~isempty(string)
string=string(1:length(string)-1);
end
otherwise,
string=[string char]; %#ok<AGROW>
end
end
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