This is an example that emulates an application that books flights, as described in task 3 of 7gui tasks.
The focus of Flight Booker lies on modelling constraints between widgets on the one hand and modelling constraints within a widget on the other hand. Such constraints are very common in everyday interactions with GUI applications. A good solution for Flight Booker will make the constraints clear, succinct and explicit in the source code and not hidden behind a lot of scaffolding.
| Initial state | Invalid date format | Return date before start date |
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