Matlab Listbox GUI No Selection

I asked previously about setting the listbox properties so that when a list of files is loaded, the first one is not selected. I was told there was no way around that, which basically concluded as well. However, after chance, I determined that if I clicked in the empty box, then loaded the file names in the box, none of them would be selected. Is there anyway to "fake" a mouse click? It only happens if I click, or double click inside the listbox. I was trying something along the lines of:

set(handles.figure1,'SelectionType','open')

I tried that inside of (files is the listbox tag-this function executes on selection change in filebox:

function files_Callback(hObject, eventdata, handles)

Any hope with this?

Answer 1

[per isakson]

I have trouble understanding your question. Isn't there one negation too many? However,

• regarding "fake mouse click" read about awt.robot at http://undocumentedmatlab.com/blog/gui-automation-robot/. IMO not worth the trouble.
• regarding "none selected" with code

    set( listbox_handle, 'Value', [] )

• regarding "none selected" interactively I've failed an added the string "- none -" at the top of the list. Selecting that row triggers

    set( listbox_handle, 'Value', [] )

.

With R2012a on Windows 7

[Walter Roberson]

In R2012a and later on OS-X, set( listbox_handle, 'Value', [] ) when String property is non-empty, results in

Warning: single-selection listbox control requires a scalar Value
Control will not be rendered until all of its parameter values are valid

[Jan]

@Walter: Does the warning appear, when multi-selection is enabled?

set(listbox_handle, 'Min', 0, 'Max', 2, 'Value', [])

[Jared]

I can confirm that set(listbox_handle, 'value',[]) does work with multiselect enabled.

Thanks

Answer 2

[Jeffery Devereux]

Try this:

set(app.ListBox, 'Value', { })

[Amanda Figueroa]

This one worked for me. Thanks!

Answer 3

[Walter Roberson]

R2012a on OS-X Lion, I do not get that behavior. If I create a uicontrol style listbox, at the command line, then click in it, and then set() its String, I get

Warning: single-selection listbox control requires a scalar Value
Control will not be rendered until all of its parameter values are valid

[Walter Roberson]

Ah, just a thought; this is only a problem if multi-select is not on. Perhaps you could take advantage of that?

[Jared]

I do have multi-select enabled, so maybe there is some hope... But like I said in the other question, this isn't a huge deal if I can't get it to work.