Invoking a pushbutton - without pushing it...
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From: Mark Proulx on 24 Jun 2010 16:06 Walter Roberson <roberson(a)hushmail.com> wrote in message <i00dbk$g38$1(a)canopus.cc.umanitoba.ca>... > Mark Proulx wrote: > > Walter Roberson <roberson(a)hushmail.com> wrote in message > > <i00btk$dst$1(a)canopus.cc.umanitoba.ca>... > >> Mark Proulx wrote: > >> > Consider a situation where a GUI includes a pushbutton that executes > >> > some code associated with a callback function that is nested in the > >> GUI > function. Does there exist a mechanism that would allow one to > >> execute > the callback code via an external command so that the > >> callback executes > as though the button had actually been pushed? > >> > >> Yes, just call the routine with appropriate parameters. > >> > >> mybuttoncallback(button_handle, [], arg1, arg2, ...) > > > > As always, thanks for the response. This is the approach I'm trying, > > but for some reason, it isn't working. ML responds with an "undefined > > function or method..." error, as though the callback function is out of > > scope. I will continue to work this... > > Is it possible that it is a nested routine and you are trying to call it from > outside of the nest? > > If so then you will have to somehow locate the button handle, probably using > findobj() with an appropriate set of criteria. > > h = findobj('Type','uicontrol','Style,'pushbutton','Tag', 'Here_I_am'); > > then > > cb = get(h,'Callback'); > cb{1}(h, [], cb{2:end}); Yes - the callback that I'm trying to call is nested, and yes, I'm trying to call it from outside the nest. I was certain that this was the root of my trouble, but could not conjure a way around it. I even went as far (in debug mode) to invoke the get(h,'Callback'), but did not know what to do with it. Do I correctly interpret this line: cb{1}(h, [], cb{2:end}); ....as the mechanism by which one can invoke the callback having retrieved it with "get?"
From: Mark Proulx on 24 Jun 2010 16:14 "Mark Proulx" <mark.p.proulx(a)boeing.com> wrote in message <i00drd$qr3$1(a)fred.mathworks.com>... > Walter Roberson <roberson(a)hushmail.com> wrote in message <i00dbk$g38$1(a)canopus.cc.umanitoba.ca>... > > Mark Proulx wrote: > > > Walter Roberson <roberson(a)hushmail.com> wrote in message > > > <i00btk$dst$1(a)canopus.cc.umanitoba.ca>... > > >> Mark Proulx wrote: > > >> > Consider a situation where a GUI includes a pushbutton that executes > > >> > some code associated with a callback function that is nested in the > > >> GUI > function. Does there exist a mechanism that would allow one to > > >> execute > the callback code via an external command so that the > > >> callback executes > as though the button had actually been pushed? > > >> > > >> Yes, just call the routine with appropriate parameters. > > >> > > >> mybuttoncallback(button_handle, [], arg1, arg2, ...) > > > > > > As always, thanks for the response. This is the approach I'm trying, > > > but for some reason, it isn't working. ML responds with an "undefined > > > function or method..." error, as though the callback function is out of > > > scope. I will continue to work this... > > > > Is it possible that it is a nested routine and you are trying to call it from > > outside of the nest? > > > > If so then you will have to somehow locate the button handle, probably using > > findobj() with an appropriate set of criteria. > > > > h = findobj('Type','uicontrol','Style,'pushbutton','Tag', 'Here_I_am'); > > > > then > > > > cb = get(h,'Callback'); > > cb{1}(h, [], cb{2:end}); > > Yes - the callback that I'm trying to call is nested, and yes, I'm trying to call it from outside the nest. I was certain that this was the root of my trouble, but could not conjure a way around it. I even went as far (in debug mode) to invoke the get(h,'Callback'), but did not know what to do with it. Do I correctly interpret this line: > > cb{1}(h, [], cb{2:end}); > > ...as the mechanism by which one can invoke the callback having retrieved it with "get?" This... cb{1}(h, [], cb{2:end}); ....didn't work, but this: cb(h, [], cb{2:end}); ....seems to. It looks like you may have given me what I needed to know. I think.
From: Walter Roberson on 24 Jun 2010 16:39 Mark Proulx wrote: >> Yes - the callback that I'm trying to call is nested, and yes, I'm >> trying to call it from outside the nest. I was certain that this was >> the root of my trouble, but could not conjure a way around it. I even >> went as far (in debug mode) to invoke the get(h,'Callback'), but did >> not know what to do with it. Do I correctly interpret this line: >> >> cb{1}(h, [], cb{2:end}); >> >> ...as the mechanism by which one can invoke the callback having >> retrieved it with "get?" > > This... > > cb{1}(h, [], cb{2:end}); > > ...didn't work, but this: > > cb(h, [], cb{2:end}); > > ...seems to. It looks like you may have given me what I needed to > know. I think. If your callback is defined with {} as in set(h, 'Callback', {@PushMe, 'Yeh!'}) then you need the cb{1} form. If though you did not use {}, as in set(h, 'Callback', @PushMe) then cb(h, []); would be appropriate. If you defined your callback as a string then normally you could feval(), but in this particular case where the routine is nested that would not work outside the nest.
From: Mark Proulx on 24 Jun 2010 16:58 Walter Roberson <roberson(a)hushmail.com> wrote in message <i00fud$k9l$1(a)canopus.cc.umanitoba.ca>... > Mark Proulx wrote: > > >> Yes - the callback that I'm trying to call is nested, and yes, I'm > >> trying to call it from outside the nest. I was certain that this was > >> the root of my trouble, but could not conjure a way around it. I even > >> went as far (in debug mode) to invoke the get(h,'Callback'), but did > >> not know what to do with it. Do I correctly interpret this line: > >> > >> cb{1}(h, [], cb{2:end}); > >> > >> ...as the mechanism by which one can invoke the callback having > >> retrieved it with "get?" > > > > This... > > > > cb{1}(h, [], cb{2:end}); > > > > ...didn't work, but this: > > > > cb(h, [], cb{2:end}); > > > > ...seems to. It looks like you may have given me what I needed to > > know. I think. > > If your callback is defined with {} as in > > set(h, 'Callback', {@PushMe, 'Yeh!'}) > > then you need the cb{1} form. If though you did not use {}, as in > > set(h, 'Callback', @PushMe) > > then > > cb(h, []); > > would be appropriate. > > If you defined your callback as a string then normally you could feval(), but > in this particular case where the routine is nested that would not work > outside the nest. The callback function is 'reset_bttn_Callback' It's defined in the context of a uicontrol, viz., hreset = uicontrol(fmstr,'Style','pushbutton',... 'String','Reset',... 'Units','normalized',... 'Position',[0.300,0.100,0.400,0.050],... 'Callback',{@reset_bttn_Callback}); Given this manner of definition, the "cb(h,[])" format works, although I can't say I know this by virtue of anything but tria and error ;-)
From: Jan Simon on 24 Jun 2010 17:20
Dear Mark! > Consider a situation where a GUI includes a pushbutton that executes some code associated with a callback function that is nested in the GUI function. Does there exist a mechanism that would allow one to execute the callback code via an external command so that the callback executes as though the button had actually been pushed? Straight: Do not use a nested function as call back. Tricky: Create a Java robot which performs the mouse click. See: http://www.mathworks.com/matlabcentral/newsreader/view_thread/243113 Good luck, Jan |