how to count key presses in limited time?

Question

alex 2012-10-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/50677-how-to-count-key-presses-in-limited-time

its aquestion I've asked before, and got some answers, but I'v just found out that it doesnt count key presses- it counts also if I just hold the key pressed wthout releasing it- and thats no good...

this is what I have now- and I want to fix somehow-

    %State variables
   count = 0;
  allowCounting = false;
  %Timer
  t = timer('StartDelay',10,'TasksToExecute',1,'StartFcn',@timerStarted,...
    'TimerFcn',@timerFinished);
   %Callback functions
      %When the user presses a key
      function youPressedSomething(~,eventdata)
          %See if it is the space bar
          set(a8,'Visible','off');
          set(a9,'Visible','on');
          set(th,'Visible','on','String',[ num2str(count) ]);
          if strcmp(eventdata.Character,' ') && flag
              if allowCounting
                  count = count+1;
                  set(th,'Visible','on','String',[ num2str(count) ]);
              else
                  startTimer;
              end
          end
      end
      %Kick off the timer!
      function startTimer
          start(t);
      end
      %Callback for when timer starts
      function timerStarted(~,~)
          count = 1;
          allowCounting = true;
      end
      %Callback for when timer finishes
      function timerFinished(~,~)
        ......

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Answer 1

Matt Fig 2012-10-12

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https://ww2.mathworks.cn/matlabcentral/answers/50677-how-to-count-key-presses-in-limited-time#answer_61837

编辑：Matt Fig 2012-10-13

在 MATLAB Online 中打开

I would do it just like I showed you before, but add a keyreleasefcn. So when the user pushes the correct key, a value is set. Subsequent calls to the keypressfcn are ignored unless the value is unset by the keyreleasefcn. For example (recall you may want to use windowkeypressfcn and windowkeyreleasefcn instead...):

function youPressedSpaceBrah2
%Create figure and text box
S.tm = 0;
S.tm(2) = 1;
S.fh = figure('KeyPressFcn',@youPressedSomething,...
              'KeyReleaseFcn',@youReleasedSomething,...
              'menu','none',...
              'pos',[400 400 320 50]);
S.th = uicontrol('Style','text','Position',[10 10 300 30],...
                'String','You have not hit space yet');
S.cnt = 0;  
S.R = 1;
      function youPressedSomething(varargin)
          %See if it is the space bar
      if ~S.R
          return
      else 
          S.R = 0;
      end
      S.tm(2) = now;  % Holds current time.
      if diff(S.tm)*86400>10 % Greater than 10 secs?
          S.tm(1) = now;
          S.cnt = 0;
      end
      if strcmp(varargin{2}.Character,' ')
          S.cnt = S.cnt + 1;
          set(S.th,'str',sprintf('You hit space %i times brah!',S.cnt));
      end
      end
      function youReleasedSomething(varargin)
          S.R = 1;
      end
  end

.

Here is another example. This one does not use nested functions, so it is more like what you might find when working with at GUI built by GUIDE. Notice that I use the GUIDATA function throughout. Your code will differ, of course, but I think you can get the idea....

.

function youPressedSpaceBrah3
%Create figure and text box
S.tm = 0;
S.tm(2) = 1;
S.fh = figure('KeyPressFcn',@youPressedSomething,...
              'KeyReleaseFcn',@youReleasedSomething,...
              'menu','none',...
              'pos',[400 400 320 50]);
S.th = uicontrol('Style','text','Position',[10 10 300 30],...
                'String','You have not hit space yet');
S.cnt = 0;  
S.R = 1;
guidata(S.fh,S)  % Store the handles.
function youPressedSomething(varargin)
%See if it is the space bar
S = guidata(gcbf);  % Get the structure
if ~S.R
    return  % User has not released the spacebar....
else
    S.R = 0;
end
S.tm(2) = now;  % Holds current time.
if diff(S.tm)*86400>10 % Greater than 10 secs?
    S.tm(1) = now;
    S.cnt = 0;
end
if strcmp(varargin{2}.Character,' ')
    S.cnt = S.cnt + 1;
    set(S.th,'str',sprintf('You hit space %i times brah!',S.cnt));
end
guidata(gcbf,S) % Save the structure
function youReleasedSomething(varargin)
S = guidata(gcbf);  % Get the structure
S.R = 1;
guidata(gcbf,S) % Save the structure