TabGroup: How to execute code before selection changed?
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Hi,
I've written a GUI with a TabGroup that has five tabs. If the user makes some changes to data on Tab1 and then changes to Tab2 I would like to execute some code before the Tab changes. I've added a SelectionChanged callback to my TabGroup and tried to put the code to be executed there, but then it is executed after the Tab changed. So I would like to have following order: (1) user clicks on new tab, (2) execute some code, (3) change to new selected tab.
I'm using Matlab R2020b.
Thank you very much!
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Benjamin Kraus
2022-1-7
编辑：Benjamin Kraus
2022-1-7
I'm curious, why do you need the code to run before switching tabs?
I don't believe this is possible without basically implementing your own tabs. For example, you could use buttons above a stack of uipanels, and when users click the buttons you can make different uipanels visible/invisible (but run your own code first). I suppose you could also attempt to overlay buttons on-top-of the tabs (to hide the tabs), but that would probably be even clunkier than the button + uipanel approach.
Maybe another alternative would be to have your SelectionChanged callback do the following:
- Switch back to the previous tab (set the SelectedTab back to the previous tab).
- Run your code.
- Switch back to the new tab.
- Record the current tab, for use in step 1 next time.
This will result in a flicker (you will briefly see the new tab before switching back to the old tab), but it is the best I can think of, and it might work well enough. For example:
tg = uitabgroup;
t(1) = uitab(tg,'Title','one');
t(2) = uitab(tg,'Title','two');
t(3) = uitab(tg,'Title','three');
for ii = 1:3
ax(ii) = axes(t(ii));
ax(ii).Color(ii) = 0;
end
tg.UserData.PreviousTab = t(1);
tg.SelectionChangedFcn = @change;
function change(tg, ~)
newTab = tg.SelectedTab;
previousTab = tg.UserData.PreviousTab;
if newTab ~= previousTab % This should prevent recursion.
tg.SelectedTab = tg.UserData.PreviousTab;
a = previousTab.Children;
title(a,sprintf('Goodbye %s', previousTab.Title));
pause(1);
title(a,'');
tg.UserData.PreviousTab = newTab;
tg.SelectedTab = newTab;
end
end
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