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Callback Stack

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Callback Stack



30 Sep 2008 (Updated )

Easy way to add multiple callbacks to objects, which support callback-functions (e.g. HG objects)

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Handy function to add/remove/append an arbitrary number of callbacks to an object (e.g. figure, axes, line, patch, surface, text, image, zoom, pan, rotate, ...).

This function is extremely useful, if you write general purpose functions, which should be executed as object-callbacks without deleting any already existing callback(s).

A simple example can illustrate the functionality. Click on the current axis after executing each command:

CallbackStack(gca,'ButtonDownFcn','disp(''Hello'')') % Now click
CallbackStack(gca,'ButtonDownFcn',{@disp, 'World'}) % Click again
CallbackStack(gca,'ButtonDownFcn',{@disp, 'Hello'}) % ...
CallbackStack(gca,'ButtonDownFcn',{@disp, 'Hello'})
CallbackStack(gca,'ButtonDownFcn',{@disp, 'World'},'add')
CallbackStack(gca,'ButtonDownFcn',{@disp, 'World'},'remove')

This should give you an idea of how to add/append/remove callbacks to an object. OK, hope you find this useful. For further details have a look in the help contained in the file.


MATLAB release MATLAB 7.4 (R2007a)
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21 Jan 2009 1.2

Revision 33:
- Better handling of different callback-styles (string, simple function handle, cell array).
- Removed some error-checking.
- New "add"-switch
- Bug-fixes.

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