question about the function of callback

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zhiping
zhiping 2011-5-17
hello, I have a question about the writing the function of callback. # how to callback a group of function? For exemple, We use 'callback' like this way: 'callback', @pushbutton_callback. Here pushbutton_callback is a function. In my interface there is many same functions repeated, Can I realize to write the function of callback like @pushbutton_callback(k), and there is the function of callback related. I know writing directly like pushbutton_callback(k) is not correct. I didn't find something similar. What should I do?
  2 个评论
Andy
Andy 2011-5-17
Can you clarify: do you want a single pushbutton to fire off multiple callback functions, or do you want to set the callbacks for all of your pushbuttons in one call?
zhiping
zhiping 2011-5-17
I used a loop to create multiple pushbuttons(pushbuttons(k)), and want to use a loop to write his own function ( pushbuttons_callback(k)). thanks in advance.

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采纳的回答

Jan
Jan 2011-5-17
Function handles cannot be combined in an array due to the konfusion of the indexing and the input arguments. But you can create a cell of function handles:
C = {@sin, @cos, @tan};
for i = 1:3
feval(C{i}, pi)
% In modern Matlab versions also directly:
% C{i}(pi)
end
Similar works for pushbutton_callback{k}.

更多回答（2 个）

Paulo Silva
Paulo Silva 2011-5-17
If you have several pushbuttons each one with his own function, try this:
hb = uicontrol('Style','pushbutton',...
'String','PushMe');
set(hb,'Callback',sprintf('pushbutton%d_callback',k))
%for button1
%pushbutton1_callback
This also might work (not tested)
hb = uicontrol('Style','pushbutton',...
'String','PushMe');
set(hb,'Callback',sprintf('@pushbutton%d_callback',k))
%for button1
%pushbutton1_callback
Yoav Livneh
Yoav Livneh 2011-5-17
Another option is to do this:
push_button(k) = uicontrol('style','pushbutton',...
'callback',{@pushbutton_callback_main,k});
and the callback function:
function pushbutton_callback_main(obj,event,idx)
% Run pushbutton_callback number idx
eval(['pushbutton_callback' idx]);
end
There's probably a way to do this without eval but can't think of one right now

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