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# Input Server Structures and Constants

## Structures

### input_device_ref

Declared in: be/add-ons/input_server/InputServerDevice.h

struct `input_device_ref` { char *name; input_device_type type; void *cookie; }

The `input_device_ref` structure is used to identify specific devices that a BInputServerDevice manages. To tell the Input Server about the devices your object manages, you create an array of these structures and pass them in a `BInputServerDevice::RegisterDevices()` call.

The fields are:

Field | Meaning
const char *`name` | An arbitrary—but preferably human-readable—name that you invent. Although the name is used as an identifier (in `Control()` calls), you should choose a name that's "UI-suitable" (e.g. "ADB Mouse", or "USB Keyboard").
input_device_type `type` | This is either `B_POINTING_DEVICE` (i.e. mice), `B_KEYBOARD_DEVICE`, or `B_UNDEFINED_DEVICE`, where the last of these is a catchall for anything that isn't a mouse or a keyboard.
void *`cookie` | This is an arbitrary piece of data that you can associate with the device. Use it to conveniently store some cogent piece of data (such as *`this`), or to more specifically identify the device (such as the pathname of the driver it corresponds to), and so on.

## Constants

### Device Types

Declared in: be/interface/Input.h

`B_POINTING_DEVICE`
`B_KEYBOARD_DEVICE`
`B_UNDEFINED_DEVICE`

These constants represent the different types of input devices; they're used when defining an `input_device_ref` structure, and when sending control messages through a BInputDevice object.

- `B_POINTING_DEVICE` signifies devices, such as mice and tablets, that are used to control the cursor.

- `B_KEYBOARD_DEVICE` signifies keyboards.

- `B_UNDEFINED_DEVICE` is anything that isn't a pointer or keyboard.

| Note that there is no "joystick device"—the Input Server doesn't currently handle joysticks.

### Input , Method , Operations

Declared in: be/interface/Input.h

enum `input_method_op` { `B_INPUT_METHOD_STARTED`, `B_INPUT_METHOD_STOPPED`, `B_INPUT_METHOD_CHANGED`, `B_INPUT_METHOD_LOCATION_REQUEST` }

### Input , Device , Notifications

Declared in: be/interface/Input.h

enum `input_device_notification` { `B_INPUT_DEVICE_ADDED`, `B_INPUT_DEVICE_STARTED`, `B_INPUT_DEVICE_STOPPED`, `B_INPUT_DEVICE_REMOVED` }

### Input , Device , Control , Messages

Declared in: be/add-ons/input_server/InputServerDevice.h

`B_KEY_MAP_CHANGED`
`B_KEY_LOCKS_CHANGED`
`B_KEY_REPEAT_DELAY_CHANGED`
`B_KEY_REPEAT_RATE_CHANGED`
`B_MOUSE_TYPE_CHANGED`
`B_MOUSE_MAP_CHANGED`
`B_MOUSE_SPEED_CHANGED`
`B_CLICK_SPEED_CHANGED`

These constants are used in the `BInputServerDevice::Control()` function to tell a BInputServerDevice that a change to a device parameter has been requested.

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