MATLAB: ‘AutoResizeChildren’ App designer warning

app designerMATLAB

This occurred in an area of the code that was grayed out (unchangeable and created by the App Designer). Thoughts on what this could mean?

Warning: 'SizeChangedFcn' callback will not execute while 'AutoResizeChildren' is set to 'on'. > In LaunchAcoustics/createComponents (line 982) In LaunchAcoustics (line 1098) In FSIAcousticsApp/startApp (line 90) In FSIAcousticsApp (line 48) In appinstall.internal.runapp>execute (line 78) In appinstall.internal.runapp>runapp13a (line 57) In appinstall.internal.runapp>runcorrectversion (line 36) In appinstall.internal.runapp (line 18)

Best Answer

In short:

The warning is displayed because you have both the "Resize components when app is resized" option checked and have written a SizeChangedFcn callback on a container. These two things are mutually exclusive, you must choose one or the other. If you have both, the SizeChangedFcn callback will be ignored.

More details...

AutoResizeChildren is a property that corresponds to the "Resize components when app is resized" checkbox in the "uifigure properties" panel (to see this panel, click on the edge of the uifigure, this panel is by default in the lower right side).

Code-wise, when this checkbox is checked, the AutoResizeChildren is set to 'on' on the uifigure and on all the containers inside that app.
Behavior-wise, when the checkbox is checked, once you run the app and then resize it, components inside your app (and inside all the containers) will be resized based on some heuristics.

Now, containers also have a SizeChangedFcn property that allows you to specify how components should be resized when the container itself is resized.

You should either choose to have the components resized based on the heuristics (i.e. check that checkbox), or write SizeChangedFcn callbacks on the containers, but not both. If you have written a SizeChangedFcn function on any container inside that app or on the uifigure, and checked the AutoResizeChildren option, the SizeChangedFcn function(s) will be ignored and components will be resized based on the heuristics. The warning tells you that the SizeChangedFcn will be ignored.

If you want the SizeChangedFcn callback(s) to work, you must uncheck the "Resize components when app is resized" checkbox.

Note: Even if you have removed the content of a SizeChangedFcn callback, the callback is still defined. If you want to use AutoResizeChildren behavior, you must remove the SizeChangedFcn callback altogether (right click, delete the callback).

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MATLAB: Appdesigner button group problem

Enabled property is not valid for Button Group but valid for Button. So, app.Button.Enable = 'off' will work.

%% Create UIFigure
app.UIFigure = uifigure;
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = 'UI Figure';
% Create ButtonGroup
app.ButtonGroup = uibuttongroup(app.UIFigure);
app.ButtonGroup.Title = 'Button Group';
app.ButtonGroup.Position = [282 115 123 106];
% Create Button
app.Button = uiradiobutton(app.ButtonGroup);
app.Button.Enable = 'off';
app.Button.Text = 'Button';
app.Button.Position = [11 60 58 22];
app.Button.Value = true;
% Create Button2
app.Button2 = uiradiobutton(app.ButtonGroup);
app.Button2.Enable = 'off';
app.Button2.Text = 'Button2';
app.Button2.Position = [11 38 65 22];
% Create Button3
app.Button3 = uiradiobutton(app.ButtonGroup);
app.Button3.Text = 'Button3';
app.Button3.Position = [11 16 65 22];
%% Disable all buttons 
app.Button.Enable = 'off';
app.Button2.Enable = 'off';
app.Button3.Enable = 'off';

Also, Button Group has Visible property, so you can hide button group by the following.

app.ButtonGroup.Visible = 'off';

MATLAB: App Designer: Keeping some components fixed size while resizing the rest

1. Set the "AutoResizeChildren" property to 'off' on the parent of the uipanel which needs to be of fixed width and write a SizeChangedFcn for it instead.

Write callback functions with the "SizeChangedFcn" property that would make the uipanel grows taller and make the axes grows wider and taller when the app is resized.

2. Leave AutoResizeChildren to 'on' on the uipanel (and any containers inside it), so that when the uipanel is made taller (via the SizeChangedFcn written above), the things inside the uipanel get auto resized.

Best Answer

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MATLAB: Appdesigner button group problem

MATLAB: App Designer: Keeping some components fixed size while resizing the rest

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