BindingsJoystick

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This sample contains a "joystick" view that shows how you can implement a bindings-enabled subclass of NSView.

In addition to supporting basic binding for a sigle value, it responds properly to multiple selection markers. It is discussed in greater detail in "Cocoa Bindings Programming Topics > How Do Bindings Work?" (http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaBindings/Concepts/HowDoBindingsWork.html).

User Interface

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The user interface is contained in MainMenu.xib.

The main objects instantiated in the nib file are:

* A window that contains

  - A table view to display Position objects.

  - A Joystick view.

  - Text fields to display and edit angle and offset values of the currently-selected Position object.

* An instance of AppController to manage the view and a collection of Position objects.

* An array controller for the App Controller's Position objects.

Classes

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The classes used in the sample are as follows:

AppController:

A simple controller object that manages a collection of Position objects containing offset and angle values. It is also responsible for establishing the bindings from the joystick view to the array controller.

JoystickView:

The main focus of the sample: A view that displays the angle and offset of an object, and allows those values to be edited graphically. These features also support bindings.

Position:

A trivial model class to encapsulate an angle and an offset.