(ui): add check/uncheck slot in SSignalButton
Description
These two new slots allows to easily check/uncheck the button without using a boolean parameter. It can be connected to a SSlotCaller or any signal.
Update TutoGui to show an example on these two new slots.
Closes #555 (closed)
How to test it?
- Launch TutoGui
- click on "Click" button (bottom left)
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➡ button "Check" should be checked and the icon should change to stop icon
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- click on "Me" button
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➡ button "Check" should be unchecked and the icon should change to play icon
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