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# MPxMidiInputDevice Class Reference
OpenMayaUI - API module for user interface | Proxy classes

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## Detailed Description

Midi input device.

This is the base class for user defined MIDI input devices.

Child classes of MPxMidiInputDevice should define:

- a constructor which defines number of buttons and axes
- nameAttributes() which names the buttons and axes (optional)
- deviceState() which turns a midi event into an MDeviceState or returns NULL if it is not a midi event from this device

Examples:

  jlcVcrDevice.cpp.

`#include <MPxMidiInputDevice.h>`

List of all members.

## Public Member Functions
virtual MStatus | openDevice ()
| Open the midi device.
virtual void | closeDevice ()
| Close the midi device. Search for all occurrences
virtual void | nameAxes ()
| Assign names to the axes of the device. Search for all occurrences
virtual void | nameButtons ()
| Assign names to the buttons of the device.
virtual MDeviceState * | deviceState ()
| Return the current state of the input device.
virtual MStatus | sendMessage (const char *const messageType, const char *const messageParams)
| If this midi event belongs to this device then fiil up the MDeviceState.
virtual char * | getMessage (const char *const messageType, char *messageResponse)
| User should override this method.
virtual void | doButtonEvents (bool=true)
| This method is used to specify whether this device is accepting button events from its child.
virtual void | doMovementEvents (bool=true)
| This method is used to specify whether this device is accepting movement input from its child.
## Static Public Member Functions
static const char * | className ()
| Returns the name of this class.
## Protected Member Functions
MStatus | setNamedButton (const MString &, unsigned short)
| Set the name of the specified button.
MStatus | addChannel (MDeviceChannel &)
| Add the given channel to this device.
MStatus | setDegreesOfFreedom (int freedom)
| Set the degrees of freedom for this device.
MStatus | setNumberOfButtons (int buttons)
| Set the number of buttons for this device. Search for all occurrences

## Member Function Documentation

MStatus openDevice | ( |  | ) | `[virtual]`

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Open the midi device.

Returns:
  Status code.

MDeviceState * deviceState | ( |  | ) | `[virtual]`

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Return the current state of the input device.

Returns:
  Device state object.

Examples:
  jlcVcrDevice.cpp.

MStatus sendMessage | ( | const char *const | messageType,
|  | const char *const | messageParams
| ) |  | `[virtual]`

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If this midi event belongs to this device then fiil up the MDeviceState.

Otherwise return NULL. The user should override this method.

User should override this method.

Parameters:

  [in] | messageType | Message to send.
  [in] | messageParams | Message parameters.

Returns:
  Status code.

char * getMessage | ( | const char *const | messageType,
|  | char * | messageResponse
| ) |  | `[virtual]`

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User should override this method.

Parameters:

  [in] | messageType |
  [out] | messageResponse |

void doButtonEvents | ( | bool | val = `true` | ) | `[virtual]`

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This method is used to specify whether this device is accepting button events from its child.

Parameters:

  [in] | val |

void doMovementEvents | ( | bool | val = `true` | ) | `[virtual]`

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This method is used to specify whether this device is accepting movement input from its child.

Parameters:

  [in] | val |

const char * className | ( |  | ) | `[static]`

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Returns the name of this class.

Returns:
  Name of this class.

MStatus setNamedButton | ( | const MString & | buttonName,
|  | unsigned short | button
| ) |  | `[protected]`

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Set the name of the specified button.

Parameters:

  [in] | buttonName | Name of button.
  [in] | button | Index of button.

MStatus addChannel | ( | MDeviceChannel & | channel | ) | `[protected]`

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Add the given channel to this device.

Parameters:

  [in] | channel | Channel to add.

MStatus setDegreesOfFreedom | ( | int | freedom | ) | `[protected]`

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Set the degrees of freedom for this device.

Parameters:

  [in] | freedom | New degrees of freedom value.

MStatus setNumberOfButtons | ( | int | buttons | ) | `[protected]`

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Set the number of buttons for this device.

Parameters:

  [in] | buttons | New number of buttons.

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