Conversion of App Designer uielements to "regular ones" about mlapp2classdef HOT 8 OPEN

For the record, HG1 (R2014a and older) also supports dot-notation, if you simply ensure that all the relevant GUI/graphic handles are handle() objects rather than numeric. For example, the following code runs ok on HG1:

hFig = handle(gcf);  % trick to enable dot-notation on GUI/graphic objects
hFig.Color = 'w';
hFig.CloseRequestFcn = @myCallback;

The nice thing about this is that it's fully backward-compatible, meaning that hFig=handle(gcf) is transparent to HG2 and meaningful to HG1, so it can be used in Matlab code on both HG1 and HG2.

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It actually even improves performance in some cases:
https://undocumentedmatlab.com/blog/performance-accessing-handle-properties

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A caveat to this conversion is that the GUIs will still likely require R2014b or newer. The App Designer makes extensive use of dot notation to access properties of UI objects rather than set or get. A warning to this effect will be included for users running mlapp2classdef in MATLAB versions prior to R2014b.

Though a fun project idea on its own, creating a parser to robustly handle these compatibility issues is beyond the scope of this project.

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Another consideration is that a lot of the object properties and callbacks are new to R2016a, which isn't something that can be reliably caught without significant effort

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For posterity: it may be possible to convert some App Designer elements to Java Swing components, e.g.:

%% List of JComponents:
% https://docs.oracle.com/javase/8/docs/api/javax/swing/JComponent.html

%% Spinner - https://docs.oracle.com/javase/8/docs/api/javax/swing/JSpinner.html
jSp = javaObjectEDT('javax.swing.JSpinner');
% Get available methods & fields:
M = methods(jSp); 
F = fields(jSp); % fields often contain the allowable settings for methods.
% Set some properties:
jSp.setAlignmentX(jSp.LEFT_ALIGNMENT);
% Display component
[jSpinner, hSpContainer] = javacomponent(jSp,'South');
% https://docs.oracle.com/javase/8/docs/api/javax/swing/SwingConstants.html

%% Scrollbar (example based on Altman-2012)
% Create and initialize a JScrollBar object 
jSb = javaObjectEDT('javax.swing.JScrollBar');
% Set some properties:
jSb.setOrientation(jSb.HORIZONTAL);
% Display component
[jScrollbar, hSbContainer] = javacomponent(jSb,'North');

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Here's a better demo of how to make a spinner and attach a callback to it:

function hFig = spinnerDemo
%% javacomponent "docs": Delete lines 2-3 from javacomponent.m to get access to docs using F1 (help browser)
%% Spinner - https://docs.oracle.com/javase/8/docs/api/javax/swing/JSpinner.html
hFig = figure(); 
% Create a spinner (w/o model): 
jJSpinnerNM = javacomponent(javax.swing.JSpinner,[50,40,80,30],hFig);
jJSpinnerNM.StateChangedCallback = @(hObject,eventdata)onSpinnerValueChanged(hObject,eventdata);
% Create a spinner (w/ model): 
spModel = javax.swing.SpinnerListModel({'item1','item2','item3'});
  % https://docs.oracle.com/javase/8/docs/api/javax/swing/SpinnerModel.html
jJSpinnerM = javacomponent(javax.swing.JSpinner(spModel),[50,80,80,30],hFig);
jJSpinnerM.StateChangedCallback = @(hObject,eventdata)onSpinnerValueChanged(hObject,eventdata);

%% Get available methods & fields, and set some properties:
M = methods(jJSpinnerM); 
F = fields(jJSpinnerM); % fields often contain the allowable settings for methods.

% Set some arbitrary property:
jJSpinnerNM.getEditor.getTextField.setHorizontalAlignment(javax.swing.JTextField.LEFT);
  % https://docs.oracle.com/javase/8/docs/api/javax/swing/SwingConstants.html
jJSpinnerM.setComponentOrientation(java.awt.ComponentOrientation.RIGHT_TO_LEFT);

% Crazier demo: http://www.mathworks.com/matlabcentral/fileexchange/26970-spinnerdemo
end

function onSpinnerValueChanged(hObject, eventdata)
  disp(['Spinner value is now: ' num2str(hObject.Value)]);
end

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Whoa, I didn't know that, very interesting! When I get some time this week I'll poke around and test out some changes. Haven't looked at this in a while...

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Before you modify stuff, note that the @Dev-iL's fork is 11 commits ahead, so you might want to merge his fixes first before proceeding. I'm just mentioning it since both of you did these changes 2 years ago and probably forgot about it...

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