gecko-dev/dom/webidl/FMRadio.webidl

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
interface FMRadio : EventTarget {
/* Indicates if the FM radio is enabled. */
readonly attribute boolean enabled;
/* Indicates if the antenna is plugged and available. */
readonly attribute boolean antennaAvailable;
/**
* Current frequency in MHz. The value will be null if the FM radio is
* disabled.
*/
readonly attribute double? frequency;
/* The upper bound of frequency in MHz. */
readonly attribute double frequencyUpperBound;
/* The lower bound of frequency in MHz. */
readonly attribute double frequencyLowerBound;
/**
* The difference in frequency between two "adjacent" channels, in MHz. That
* is, any two radio channels' frequencies differ by at least channelWidth
* MHz. Usually, the value is one of:
* - 0.05 MHz
* - 0.1 MHz
* - 0.2 MHz
*/
readonly attribute double channelWidth;
/* Fired when the FM radio is enabled. */
attribute EventHandler onenabled;
/* Fired when the FM radio is disabled. */
attribute EventHandler ondisabled;
/**
* Fired when the antenna becomes available or unavailable, i.e., fired when
* the antennaAvailable attribute changes.
*/
attribute EventHandler onantennaavailablechange;
/* Fired when the FM radio's frequency is changed. */
attribute EventHandler onfrequencychange;
/**
* Power the FM radio off. The disabled event will be fired if this request
* completes successfully.
*/
DOMRequest disable();
/**
* Power the FM radio on, and tune the radio to the given frequency in MHz.
* This will fail if the given frequency is out of range. The enabled event
* and frequencychange event will be fired if this request completes
* successfully.
*/
DOMRequest enable(double frequency);
/**
* Tune the FM radio to the given frequency. This will fail if the given
* frequency is out of range.
*
* Note that the FM radio may not tuned to the exact frequency given. To get
* the frequency the radio is actually tuned to, wait for the request to fire
* sucess (or wait for the frequencychange event to fire), and then read the
* frequency attribute.
*/
DOMRequest setFrequency(double frequency);
/**
* Tell the FM radio to seek up to the next channel. If the frequency is
* successfully changed, the frequencychange event will be triggered.
*
* Only one seek is allowed at once: If the radio is seeking when the seekUp
* is called, error will be fired.
*/
DOMRequest seekUp();
/**
* Tell the FM radio to seek down to the next channel. If the frequency is
* successfully changed, the frequencychange event will be triggered.
*
* Only one seek is allowed at once: If the radio is seeking when the
* seekDown is called, error will be fired.
*/
DOMRequest seekDown();
/**
* Cancel the seek action. If the radio is not currently seeking up or down,
* error will be fired.
*/
DOMRequest cancelSeek();
};