Undocumented Secrets of MATLAB-Java Programming

Undocumented Secrets of MATLAB

®

-Java Programming198

Now, attach undo/redo actions to the slider’s callback:

set(hSlider,'Callback',@test_uiundo);

% Main callback function for slider updates

function test_uiundo(varargin)

% Update the edit box with the new value

hEditbox = get(gcbo,'userdata');

newValue = get(gcbo,'value');

set(hEditbox,'string',num2str(newValue));

% Retrieve and update the stored previous value

oldValue = getappdata(gcbo,'oldValue');

if isempty(oldValue), oldValue=0; end

setappdata(gcbo,'oldValue',newValue);

% Prepare an undo/redo action

cmd.Name = sprintf('slider update (%g to %g)',oldValue,newValue);

% Note: the following is not ...