I created a listbox using the lbox2 example in matlab, and as soon as it runs it returns the value. However i want the user to click on a value, and have the listbox return that value. It should also be noted i'm using an outdated version of matlab, 2007b.
For example,
[handle,value] = myListbox;
uiwait(handle);
However value returns immediately and is blank, since the user hasn't had a change to select anything yet. Since the code waits until the dialog is closed, which is desired, but when the window is closed its data is lost... i think.
Any idea how to get the return value after the user triggers the callback?
Full code:
function varargout = ListBox(varargin)
% LBOX2 Application M-file for lbox2.fig
% LBOX2, by itself, creates a new LBOX2 or raises the existing
% singleton*.
%
% H = LBOX2 returns the handle to a new LBOX2 or the handle to
% the existing singleton*.
%
% LBOX2('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in LBOX2.M with the given input arguments.
%
% LBOX2('Property','Value',...) creates a new LBOX2 or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before lbox2_OpeningFunction gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to lbox2_OpeningFcn via varargin.
%
% *See GUI Options - GUI allows only one instance to run (singleton).
%
% See also: GUIDE, GUIDATA, GUIHANDLES
% Copyright 2000-2006 The MathWorks, Inc.
% Edit the above text to modify the response to help lbox2
% Last Modified by GUIDE v2.5 30-Oct-2015 13:36:34
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @lbox2_OpeningFcn, ...
'gui_OutputFcn', @lbox2_OutputFcn, ...
'gui_LayoutFcn', [], ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT
% --- Executes just before lbox2 is made visible.
function lbox2_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% varargin command line arguments to lbox2 (see VARARGIN)
% Choose default command line output for lbox2
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
if nargin == 3,
initial_dir = pwd;
elseif nargin > 4
if strcmpi(varargin{1},'dir')
if exist(varargin{2},'dir')
initial_dir = varargin{2};
else
errordlg('Input argument must be a valid directory','Input Argument Error!')
return
end
else
errordlg('Unrecognized input argument','Input Argument Error!');
return;
end
end
% Populate the listbox
load_listbox(initial_dir,handles)
% Return figure handle as first output argument
% UIWAIT makes lbox2 wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = lbox2_OutputFcn(hObject, eventdata, handles)
% varargout cell array for returning output args (see VARARGOUT);
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Get default command line output from handles structure
varargout{1} = handles.output;
varargout{2} = handles.systemType;
% ------------------------------------------------------------
% Callback for list box - open .fig with guide, otherwise use open
% ------------------------------------------------------------
function listbox1_Callback(hObject, eventdata, handles)
% hObject handle to listbox1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: contents = get(hObject,'String') returns listbox1 contents as cell array
% contents{get(hObject,'Value')} returns selected item from listbox1
get(handles.systemType);
get(handles.listbox1,'Value');
get(handles.figure1,'SelectionType');
if strcmp(get(handles.figure1,'SelectionType'),'open')
index_selected = get(handles.listbox1,'Value');
type_list = get(handles.listbox1,'String');
setappdata(hObject, 'systemType', type_list{index_selected});
close(handles.figure1);
end
% ------------------------------------------------------------
% Read the current directory and sort the names
% ------------------------------------------------------------
function load_listbox(dir_path,handles)
%dir_struct = dir(dir_path);
%[sorted_names,sorted_index] = sortrows({dir_struct.name}');
handles.file_names = {'option1', 'option 2', 'option 3','option 4'};
handles.systemType = '';
%handles.sorted_index = sorted_index;
guidata(handles.figure1,handles)
set(handles.listbox1,'String',handles.file_names,...
'Value',1)
% --- Executes during object creation, after setting all properties.
function listbox1_CreateFcn(hObject, eventdata, handles)
% hObject handle to listbox1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: listbox controls usually have a white background, change
% 'usewhitebg' to 0 to use default. See ISPC and COMPUTER.
usewhitebg = 1;
if usewhitebg
set(hObject,'BackgroundColor','white');
else
set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end
% --- Executes during object creation, after setting all properties.
function figure1_CreateFcn(hObject, eventdata, handles)
% hObject handle to figure1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Add the current directory to the path, as the pwd might change thru' the
% gui. Remove the directory from the path when gui is closed
% (See figure1_DeleteFcn)
setappdata(hObject, 'StartPath', pwd);
addpath(pwd);
% --- Executes during object deletion, before destroying properties.
function figure1_DeleteFcn(hObject, eventdata, handles)
% hObject handle to figure1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Remove the directory added to the path in the figure1_CreateFcn.
if isappdata(hObject, 'StartPath')
rmpath(getappdata(hObject, 'StartPath'));
end
So after the item is double clicked on, the function should return 'option1' 'option 2' 'option 3' or 'option 4' Thanks.
Rather than having the callback close the box, i changed close(h) in the callback to uiresume(h), then used the following code to use the listbox and get the value from it.
%prompt listbox
h = ListBox();
uiwait(h);
%get response from list box
appdata = getappdata(h);
type = appdata.systemType; %this was the information i was trying to get
%close the window
close(h);