This is a demo about showing a way to create a multiple scene JavaFX application using MVP.
If you are not familiarized with MVP you should first understand it. You can read about it here .
I was finding a way to create a JavaFX application using only one window or stage, and multiple scenes. The way I wanted to achieve it, was creating a mechanism to manage the presenters using a stack. Doing that I could navigate between the presenters and the scenes in a common manner, openig new pairs of presenter and view, and being able to return to previous opened presenters.
And I wanted to got it without making a great effort in every presenter source code.
This is the most important class. It manage the transitions between presenters. The presenters notify this class to add presenters or close them.
All presenters must extends this class, because it defines the interfaces to comunicate with the PresenterManager class. This class use notifyManagerToAddNewPresenter() and notifyManagerToDeletePresenter() methods to achieve it. These method are protected.
All views must implement this interface. It has the method getViewScene() to retrieve the javafx.scene.Scene object from the view object. This method is used by the PresenterManager to set the visible scene.
First, all presenters classes must extends the AbstarctPresenter class and implement all abstract methods:
getDerivedPresenter(): is used by PresenterManager to retrieve a new presenter to be opened. Inside this method you can use a switch statement or something similar to return an instance of the wished presenter, because one presenter could open different presenters. For example you could have an application which shows a window with two button, the first to open a CRUD scene of products and the other a CRUD scene of clients.
getPresenterView(): is used by PresenterManager to retrieve the PresenterView of the presenter to be opened. And then get the javafx.scene.Scene from it.
Second, you have to implement methods which calls notifyManagerToAddNewPresenter() and notifyManagerToDeletePresenter() to add new presenter and delete current presenter respectively. See the source code of this project.
Third, in the views of your presenters you have to set the listeners in buttons or widgets you want to fire the events of opening or closing presenters, and bind it with the methods created in the previous step. And you have to implement the getViewScene() method to return the javafx.scene.Scene from this view object. See the source code of this project.
Fourth, in the start(Stage) method of your Main class create an instance of PresenterManager and set the initial presenter with setInitialPresenter(AbstarctPresenter). Then you can call the show() method of AbstarctPresenter to show the stage or window of your application.
You can always check the source code of this project, if you did not understand this description.
