Create a GUI (which aim to show and change a list of variables) dynamically based on the number of variables

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Donato Cereghetti
Donato Cereghetti 2018-8-31
回答： Abel Szkalisity 2020-10-6
Hello people,
I would like to implement a code that generates dynamically a UI.
In this UI, I would like to see and change (with a button) the values of a series of variables.
Let me propose you this example:
Variables.var1.value = 5;
Variables.var2.value = 10;
Variables.var3.value = "text1";
Variables.var4.value = "text2";
Variables.var1.label = "numerical variable 1";
Variables.var2.label = "numerical variable 2";
Variables.var3.label = "alphanumerical variable 3";
Variables.var4.label = "alphanumerical variable 4";
So, I would like to have a code that actually generates automatically the UI showing per each variable (1) the label, (2) the actual value, (3) a button allowing to change the value.
This is the UI I would expect:
Of course, if 10 variables are stored in the Variables structure, the generated UI should display 10 lines, one per each variable.
Many thanks for your help... I am completely lost!
  2 个评论
Stephen23
Stephen23 2018-8-31
编辑：Stephen23 2018-8-31
@Donato Cereghetti: rather than putting numbers into fieldnames, and using nested structures (both of which are slow and awkward to access), you should store your data in a simpler non-scalar structure:
Variables(1).value = 5;
Variables(2).value = 10;
Variables(3).value = "text1";
Variables(4).value = "text2";
Variables(1).label = "numerical variable 1";
Variables(2).label = "numerical variable 2";
Variables(3).label = "alphanumerical variable 3";
Variables(4).label = "alphanumerical variable 4";
Then you can trivially loop over the non-scalar structure, or use the convenient syntaxes for accessing its contents via comma separated lists, and define the required parts of your GUI.

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采纳的回答

Dennis
Dennis 2018-8-31
As Stephen already pointed out this becomes way easier if you index your structure.
%creating 'Variables'
Variables(1).value=5;
Variables(2).value=10;
Variables(3).value='text1';
Variables(4).value='text2';
for i=4:-1:1
Variables(i).label=['v',num2str(i)];
end
%actual code begins here
for i=size(Variables,2):-1:1
handles.label(i)=uicontrol('style','text','string',Variables(i).label,'position',[40 40+(i-1)*50 100 40]);
if isnumeric(Variables(i).value)
handles.value(i)=uicontrol('style','text','string',num2str(Variables(i).value),'position',[160 40+(i-1)*50 60 40]);
else
handles.value(i)=uicontrol('style','text','string',Variables(i).value,'position',[160 40+(i-1)*50 60 40]);
end
handles.pb(i)=uicontrol('style','pushbutton','string','modify','position',[240 40+(i-1)*50 60 40]);
end
for i=1:size(handles.pb,2)
handles.pb(i).Callback={@modify_cb,handles};
end
%callback for pushbutton
function modify_cb(hObj,~,handles)
label=inputdlg('Label');
value=inputdlg('Value');
for i=1:size(handles.value,2)
if hObj==handles.pb(i)
handles.value(i).String=value;
handles.label(i).String=label;
end
end
end

更多回答（2 个）

Donato Cereghetti
Donato Cereghetti 2019-7-10
Many thanks for your clear answer! Very helpful.
Abel Szkalisity
Abel Szkalisity 2020-10-6
In case you need this many times you could also check out my dynamic settings GUI tool here: https://se.mathworks.com/matlabcentral/fileexchange/73180-matlab_settings_gui
You should just provide the input structure to it, and it generates all the ui elements for you automatically. It also handles the resize of the container GUI and generates scrollbar if you have too many ui elements.

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