CODEWITHSUNDEEP
javaoopdesign-patterns
Boris Mikhaylov
Boris Mikhaylov

Reputation: 329

Java: Getting values from GUI

In my application user gets to choose "distribution type" for a few parameters and then I create Graph and show it to him. There are 3 different types of these distributions with each of them having its own parameters ( like alpha, beta, probabilities, etc). Each parameter can have either of those distributions.

Here is the screenshot to make it clear, what I'm trying to describe:

screenshot

Distribution options are contained in CardLayout, that is controlled by combobox.

When user presses the button, I need to instantiate proper domain objects for distributions. Right now, I'm just passing ComboBox item (which is enum) and CardLayouted panel to factory that chooses proper subpanel and instantiates correct object. But it seems wrong to pass around gui objects, also makes factory useless for any other situation.

But I can't think of a better way to instantiate correct object. Probably just one idea:

All suggestions will be appreciated a lot!

Upvotes: 0

Views: 298

Answers (1)

millimoose
millimoose

Reputation: 39950

Swing has generally good support for MVC and pushing or pulling data from a domain object to input / display controls. What I'd do is:

Instantiate the panels you put into the CardLayout with a "blank" domain object as its GUI model. (Or some sort of locator that can retrieve the model from another layer.) Then hook up change notifications on your input components that will update the domain object when the values in the input change.

Then, when it comes to persisting the domain object, just retrieve it from the form panel.

If you need to show the same model value in two controls, they should share the same model. If you need to do updates to an object being displayed from lower layers of the code, you should perform the update on the model instead of / in addition to the domain object.

Upvotes: 2

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