addlistener question...
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I have created a listener which calls 'myfunction' whenever the limits of a certain set of axes changes:
addlistener(handles.axes1,'XLim', 'PostSet', @myfunction);
function myfunction
...
This works fine. Now I want to pass the handles structure to myfunction:
addlistener(handles.axes1,'XLim', 'PostSet',{@myfunction,handles});
function myfunction(handles)
...
However I recieve the error:
callbacks need to be of type function handle
I cannot pass handles, or any additional arguments to myfunction in this case. Why is this so? How would I set up a listener object properly?
采纳的回答
Jan
2011-10-20
The posted example does not work on my computer under Matlab 2011b:
addlistener(handles.axes1,'XLim', 'PostSet', @myfunction);
function myfunction % ERROR
Calling the callback function fails, because it needs at least 2 inputs:
function myfunction(ObjH, EventData) % OK
If you need a third input:
addlistener(handles.axes1,'XLim', 'PostSet', ...
@(ObjH, EventData) myfunction(ObjH, EventData, handles));
function myfunction(ObjH, EventData, handles)
更多回答（2 个）
Walter Roberson
2011-10-20
addlistener(handles.axes1,'XLim', 'PostSet', @(varargin) myfunction(varargin{:}, handles.axes1);
Then
function myfunction(varargin)
handles = guidata(varargin{end});
...
end
aodhan
2013-7-17
First I wanted to say thanks jan, I was struggling to pass the handles object into my callback function.
I wanted to add an additional example that someone might find useful. It uses the trick above to update a text box "while" a slider is being moved, rather than just updating the value after the mouse has been released.
% first add a listener to your program. I added mine to the function that executes just before the UI is made visible.
addlistener(handles.sDamping_slider,'Value', 'PostSet', ...
@(ObjH, EventData) myfunction(ObjH, EventData, handles));
% Now define the actual function that gets called "myfunction"
val = get(handles.sDamping_slider,'Value');
set(handles.sDamping_edit, 'String', num2str(val))
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