GUI to launch a function based on dropdown list

Hi there, I'm trying to create a GUI that has a drop down list, the names correspond to different functions I would like to execute when I hit a 'load data' button. There is a simple gui in the examples but this preloads data from function; peaks, membrane etc. I want to select first and then execute. The functions go off an interogate a datbase.

hope someone has a sample gui i could use please?

dave

Answer 1

[Doug Hull]

The key concepts you will need here:

Use

get(handles.popupmenu1, 'string')
get(handles.popupmenu1, 'value')

to get the selected string.

Use a switch case to choose among the options.

In each option, you will need to create a function handle to the appropriate function, ie

fh = @interogateMethodA

or

fh = @interogateMethodB

etc.

Then you can use feval, or just fh(inputs) to execute the arbitrary function with whatever inputs you wish.

Answer 2

[Walter Roberson]

dispatch_table = {@fun1, @fun2, @fun3};

thisfun = dispatch_table(get(TheHandle, 'Value'));
thisfun(AppropriateArguments);

[Doug Hull]

The only thing I don't like here is if someone else modifies the order of the choices, or adds to them, this breaks (potentially). My switch case is more bullet proof to the common situation of someone messing with the GUI and not realizing the downstream impact.

Answer 3

[David malins]

Doug, Thanks for this. Just to clarify, would I do the get 'string' and value then do the switch case and function handle all under the 'popup' call back. Then use feval fh under the 'puchbutton' callback?

cheesr

[Walter Roberson]

strs = cellstr(get(handles.popupmenu1, 'string'));

thisstr = strs{get(handles.popupmenu1, 'value')};

You would probably do this at the pushbutton callback.