How do I program a callback on a UICONTROL?

I want to present several graphs such that when I click a push button beside a graph, the next in the series appears.

I tried the following code, but the push button those not influence the running.

PushButton = uicontrol(gcf,'Style', 'pushbutton', 'String', 'Next',
        'Position', [300 10 30 30], 'Callback', 'pause');

How should I do this?

Answer 1

[Walter Roberson]

More than what you asked for...

PushButton = uicontrol(gcf, 'Style', 'push', 'String', 'Next', ...
  'Position', [300 10 30 30], ...
  'CallBack', @GraphCreator, ...
  'UserData', 0);

function GraphCreator(PushButton, EventData)

    newiter = get(PushButton, 'UserData') + 1;
    if newiter > N
      wd = warndlg('Reached end of graphs. Push again to start over');
      uiwait(wd, 30);  %30 second timeout on warning
      if ishandle(wd)  %only true if timed out
        delete(wd)
      end
      set(PushButton, 'UserData', 0);
      return
    end
    set(PushButton, 'UserData', newiter);
    InputData = load(FileName{newiter});
    fn = fieldnames(InputData);
    thisdataname = fn{1};
    create_graph(S.(thisdataname));
end

Answer 2

[Jan]

Try this at first:

PushButton = uicontrol(gcf,'Style', 'pushbutton', ...
  'String', 'Next', ...
  'Position', [300 10 30 30], ...
  'Callback', @yourCallback);

function yourCallback(ObjH, EventData)
% ObjH is the button handle
FigH = ancestor(ObjH, 'figure');  % or: gcbf
set(FigH, 'Color', rand);

Then insert something more useful in the callback function. BTW: Searching in the documentation is always a good point to start from:

docsearch callback

[noga cohen]

I'm still having problems with this.. my @yourCallback function updates the graph, but it doesn't wait for a button press to update the following graph. so the graphs are presented sequentially without stopping.

I have a for loop that creates the graph on each cycle. if I put the "PushButton = uicontrol..." inside the loop, the index does not change and on every press the same graph is created.

I have some basic misunderstanding... it should be simple...

[Jan]

@noga: Please post the relevant part of the code.

[noga cohen]

PushButton = uicontrol(gcf,'Style', 'push', 'String', 'Next', ... 'Position', [300 10 30 30], ...

'CallBack', @GraphCreator);

function GraphCreator(PushButton, EventData)

for i = 1:N

load data(i)

create graph(i)

end

[K VdB]

When I run the script noga cohen gave it says:

''All functions in a script must be closed with an 'end'.

When I close the script with an end it says:

''Function definitions are not permitted in this context.''

[Walter Roberson]

Only R2016b and later permit function definitions inside a .m file that does not start with the word "function" or "classdef" .

Anyhow: store the function inside GraphCreator.m and have the assignment to PushButton in a different routine.

Answer 3

[Doug Hull]

You need to make a function that will update your graph. Once you have done that, set the callback of the button to that function.

What you have now, when you click the button, the pause button is run. This should not do much of anything to help you.