change uitabs when the tab button is pressed on the keyboard in matlab

In MATLAB, you can change the active tab in uitabgroup when the tab button is pressed on the keyboard by utilizing the KeyPressFcn callback property of the uitabgroup object.

Here is an example code snippet to achieve this:

main.m
% Create a figure
fig = figure();

% Create a uitabgroup
tabgroup = uitabgroup(fig);

% Create tabs
tab1 = uitab(tabgroup, 'Title', 'Tab 1');
tab2 = uitab(tabgroup, 'Title', 'Tab 2');
tab3 = uitab(tabgroup, 'Title', 'Tab 3');

% Set KeyPressFcn property of the uitabgroup
tabgroup.KeyPressFcn = @(~,event) selectNextTab(event, tabgroup);

% Custom function to change active tab when tab button is pressed
function selectNextTab(event, tabgroup)
    if strcmp(event.Key, 'tab') && isempty(event.Modifier)
        currentIndex = findobj(tabgroup.SelectedTab == tabgroup.Children);
        nextIndex = mod(currentIndex, numel(tabgroup.Children)) + 1;
        tabgroup.SelectedTab = tabgroup.Children(nextIndex);
    end
end
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In this example, we create a uitabgroup with three tabs. Then we set the KeyPressFcn property of the tabgroup to a custom function selectNextTab. Inside this function, we check if the pressed key is the 'tab' key with no modifiers. If it is, we calculate the index of the current tab and select the next tab by updating the SelectedTab property of the tabgroup.

This will allow you to cycle through the tabs using the tab button on the keyboard.

Note: The KeyPressFcn property is only available for the uitabgroup object in MATLAB R2020b and newer versions.