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From: &quot;Bill &quot; &lt;millerwd@notes.udayton.edu&gt;
Newsgroups: comp.soft-sys.matlab
Subject: Re: Nested Function Error?
Date: Fri, 17 Jul 2009 17:58:01 +0000 (UTC)
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Shan, the reason why I wanted KeyPressFcn in the while loop was because I'm trying to have a running timer in the GUI I am using. The problem is that while this clock is running, I need to be able to do other things, press other buttons, etc., and also at the same time be able to pause/stop the clock if need be. I not understand that I cannot nest GUI functions in a While Loop, but I am still without a solution. Currently, my solution, enclosed below works in terms of updating the clock, but fails to properly execute the stop and pause commands.

*********************************************************************
handles.ticFlag = 0;
handles.whileInitializer = 1;
handles.escapeFlag = 0;

function figure1_KeyPressFcn(hObject, eventdata, handles)
Key = get(gcf, 'CurrentKey');
handles.Key = Key;

switch(handles.Key)
    case 'f12' %%start key
        if handles.ticFlag == 0
            handles.startFlag = 1;
            handles.ticFlag = 1;
            beep;

            tic;
            while (handles.whileInitializer == 1) &amp;&amp; (handles.escapeFlag ~= 1)
                handles.endTime = toc;
                handles.elapsedTime = handles.endTime;

                if handles.elapsedTime &gt;= .1
                     %%In this section, I have code to parse out the seconds into minutes, etc. which I end up calling handles.displayedTime I didn't feel it necessary to include this.
                end
                set(handles.Timer, 'string', handles.displayedTime);
            

                drawnow;
                handles.Key=[];
            end

    case 'escape' %%Stop key
        if handles.escapeFlag == 0
            handles.whileInitializer = 0;
            handles.escapeFlag = 1;
            set(handles.Timer, 'string', 'Stopped');
            set(handles.Timer, 'ForegroundColor', [1 0 0]);
            guidata(hObject, handles);

            %%This will reset all settings back to the starting point.

        elseif handles.escapeFlag == 1
            handles.escapeFlag = 0;
            handles.pauseFlag = 0;
            set(handles.Timer, 'string', '00:00:00');
            set(handles.Timer, 'ForegroundColor', [1 1 0]);

            %%This will restart the program and restart all settings back to t=0
        end

etc...
*********************************************************************

I hope I explained it clearly. Basically, I want to ability to start and stop a timer that basically runs in the background of the GUI while I am able to do other things. I want the timer to be accessible, such as for whether or not I should modify things in the GUI, i.e. change the location of an axes over time, changes colors at certain times, etc.
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