MATLAB Answers


GUI pop-up menu and push buttons

Alexandros Polykarpou さんによって質問されました 2012 年 12 月 14 日
最新アクティビティ Image Analyst
さんによって コメントされました 2017 年 5 月 25 日
Hey guys,
I have completed my program last week and I have been asked by my supervisor to create a GUI for it. I have no knowledge about GUI and I have never worked on anything similar before.
I have two objects in my UI. I have a pop-up menu and a push button. The pop-up button gives 4 options and the push button is a START button where my code will start running as I it would normally do without the GUI.
Buy choosing something in the drop down menu and then pressing start I would like the program to set a variable equal to something and then start running my program. (hyper.m)
Any Ideas?
Thanks guys.

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2 件の回答

Answer by Evan
on 14 Dec 2012
Edited by Evan
on 14 Dec 2012

The way I would do things is put it all in the callback of your pushbutton. The "value" property of your popupmenu will allow to determine which option the user has selected, so you can get that from within the pushbutton callback.
So something like this, within the callback of your pushbutton:
v = get(handles.mypopupmenu,'Value'); %get currently selected option from menu
if v == 1
%stuff here
elseif v == 2
%stuff here
elseif v == 3
%stuff here
elseif v == 4
%stuff here
It's sort of hard to get specific beyond that, but hopefully that gives you a good starting idea. The main point is that the "get" function lets you get the properties of any uicontrol saved in handles.

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Matt Fig
Answer by Matt Fig
on 14 Dec 2012
Edited by Matt Fig
on 14 Dec 2012

There are many ways to do this. Here is a simple example that may provide a skeleton for you to fill out.
function [] = gui_pop()
% Help goes here.
S.fh = figure('units','pixels',...
'position',[300 300 300 100],...
S.pb = uicontrol('style','push',...
'position',[10 15 280 20],...
S.pp = uicontrol('style','pop',...
'position',[10 60 280 20],...
function [] = pb_call(varargin)
% Callback for pushbutton.
S = guidata(gcbf);
N = get(S.pp,{'string','value'});
N = str2double(N{1}(N{2})); % Convert to number. May not need.
% Pass N to a function and display the results.
% This is where you can call any function on the path.
% I converted to a number, but you may need to keep the string
% depending on what your function expects. I have no clue what
% your function does or what will be in the popup, So I give a
% general example.

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pop_strings = get(pop_menu, 'String');
pop_val = get(pop_menu, 'Value');
result = pop_strings{pop_val};
May I know the codes how to get the selected string(characters) on the pop-up menu? I will be using that string as a value of a variable. In my case, the pop-up menu contains the .csv filenames in a folder located at desktop. then after selecting the filename, it automatically plot the data on axis.
Doesn't Walter's code do that? If you want a more modern OOP way, do it like this:
popStrings = handles.pop_menu.String; % All the strings in the menu.
selectedIndex = handles.pop_menu.Value;
selectedString = popStrings{selectedIndex};

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