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Each Toga application has a single ``toga.App`` instance, representing the running entity that is the application. The app may end up managing multiple windows; but for simple applications, there will be a single main window.
Next, we define a ``startup()`` method::
The first thing the startup method does is to define a main box. Toga's layout scheme behaves similar to HTML. You build an application by constructing a collection of boxes, each of which contains other boxes, or actual widgets. You then apply styles to these boxes to define how they will consume the available window space.
In this application, we define a single box, but we don't put anything into it.
Next, we define a window into which we can put this empty box::
This creates an instance of a ``toga.MainWindow``, which will have a title matching the application's name. A Main Window is a special kind of window in Toga - it's a window that is closely bound to the life cycle of the app. When the Main Window is closed, the application exits. The Main Window is also the window that has the application's menu (if you're on a platform like Windows where menu bars are part of the window).
We then add our empty box as the content of the main window, and instruct the application to show our window::
Last of all, we define a ``main()`` function. This is what creates the instance of our application::
This ``main()`` method is the one that is imported and invoked by ``__main__.py``. It creates and returns an instance of our ``HelloWorld`` application.
That's the simplest possible Toga application. Let's put some of our own content into the application, and make the app do something interesting.
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  1. BeeWare
  2. Tutorial
  3. Tutorial 2
  4. English
This creates an instance of a ``toga.MainWindow``, which will have a title matching the application's name. A Main Window is a special kind of window in Toga - it's a window that is closely bound to the life cycle of the app. When the Main Window is closed, the application exits. The Main Window is also the window that has the application's menu (if you're on a platform like Windows where menu bars are part of the window).
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../../tutorial/tutorial-2.rst:87 • 40881e7811d74e0ea38bbd84cbec12db
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a month ago
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