Waiting for a Timer object to compelte a Task

Hi,

I have a timer that runs indefinitely in background. It is incrementing a global variable, x, from 0.

Outside of the timer object, on the GUI, the user may press a button, resetting x to 0. I would like the user to wait (hang) until x > 10, at which point a message would pop up.

Is there a way for me to wait until the Timer object completes its task and check if x > 10 after each Timer task execution?

I basically want to wait for the timer to complete 10 times before I execute further code in the callback function the user triggered.

Thanks in advance.

Answer 1

[Walter Roberson]

Instead of using a global variable, use the UserData property of the timer object, and use waitfor() to wait until the UserData property has the value you want; see http://www.mathworks.com/help/techdoc/ref/waitfor.html

[Jan]

I like your approach.

Unfortunately, the waitfor() does not work when passing in the timer object (along with the 'UserData' value and x). It seems that the timer object's waitfor() function only accepts one argument, the timer object itself. :(

[Walter Roberson]

You could use the UserData property of any graphics object that exists when you create the timer object. Including of the button. You just have to pass the handle in as part of the timer object callback... or you could set the Tag on the object and findobj() it in the timer callback (though that would be less efficient.)

[Jan]

I used the 'UserData' property on the button, and used the waitfor(button, 'UserData', 10) as the condition.

Everything works. Thank you!

Answer 2

[Paulo Silva]

b=uicontrol('Style','pushbutton','callback',@pbcallback...
             'String','reset x','Position',[315,180,70,25]);

set(b,'enable','off')

In the timerfcn callback test the value of x

if x>10
set(b,'Enable','on')
%now the user can press the button
end

Replace the handle b by the handle for your pushbutton and make the function callback of the button so it can put x=0