Matlab Listbox GUI No Selection

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Jared 2013-1-25

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评论： Amanda Figueroa 2019-6-4

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?

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Answer 1

per isakson 2013-1-25

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编辑：per isakson 2013-1-25

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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

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Jan 2013-1-25

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

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

Jared 2013-1-25

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

Thanks

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Answer 2

Jeffery Devereux 2019-5-13

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Try this:

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

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Amanda Figueroa 2019-6-4

This one worked for me. Thanks!

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Answer 3

Walter Roberson 2013-1-25

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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

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Walter Roberson 2013-1-25

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

Jared 2013-1-25

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.

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