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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Abstract interface to methods that differ depending on the
* host platform.
*
*/
goog.provide('cvox.AbstractHost');
/**
* @constructor
*/
cvox.AbstractHost = function() {
};
/**
* @enum {number}
*/
cvox.AbstractHost.State = {
ACTIVE: 0,
INACTIVE: 1,
KILLED: 2
};
/**
* Do all host-platform-specific initialization.
*/
cvox.AbstractHost.prototype.init = function() {
};
/**
* Used to reinitialize ChromeVox if initialization fails.
*/
cvox.AbstractHost.prototype.reinit = function() {
};
/**
* Executed on page load.
*/
cvox.AbstractHost.prototype.onPageLoad = function() {
};
/**
* Sends a message to the background page (if it exists) for this host.
* @param {Object} message The message to pass to the background page.
*/
cvox.AbstractHost.prototype.sendToBackgroundPage = function(message) {
};
/**
* Returns the absolute URL to the API source.
* @return {string} The URL.
*/
cvox.AbstractHost.prototype.getApiSrc = function() {
return '';
};
/**
* Return the absolute URL to the given file.
* @param {string} path The URL suffix.
* @return {string} The full URL.
*/
cvox.AbstractHost.prototype.getFileSrc = function(path) {
return '';
};
/**
* @return {boolean} True if the host has a Tts callback.
*/
cvox.AbstractHost.prototype.hasTtsCallback = function() {
return true;
};
/**
* @return {boolean} True if the TTS has been loaded.
*/
cvox.AbstractHost.prototype.ttsLoaded = function() {
return true;
};
/**
* @return {boolean} True if the ChromeVox is supposed to intercept and handle
* mouse clicks for the platform, instead of just letting the clicks fall
* through.
*
* Note: This behavior is only needed for Android because of the way touch
* exploration and double-tap to click is implemented by the platform.
*/
cvox.AbstractHost.prototype.mustRedispatchClickEvent = function() {
return false;
};
/**
* Activate or deactivate ChromeVox on this host.
* @param {boolean} active The desired state; true for active, false for
* inactive.
*/
cvox.AbstractHost.prototype.activateOrDeactivateChromeVox = function(active) {
this.onStateChanged_(active ? cvox.AbstractHost.State.ACTIVE :
cvox.AbstractHost.State.INACTIVE);
};
/**
* Kills ChromeVox on this host.
*/
cvox.AbstractHost.prototype.killChromeVox = function() {
this.onStateChanged_(cvox.AbstractHost.State.KILLED);
};
/**
* Helper managing the three states of ChromeVox --
* active: all event listeners registered
* inactive: only key down listener registered
* killed: no listeners registered
* @param {cvox.AbstractHost.State} state The new state.
* @private
*/
cvox.AbstractHost.prototype.onStateChanged_ = function(state) {
var active = state == cvox.AbstractHost.State.ACTIVE;
if (active == cvox.ChromeVox.isActive) {
return;
}
cvox.ChromeVoxEventWatcher.cleanup(window);
switch (state) {
case cvox.AbstractHost.State.ACTIVE:
cvox.ChromeVox.isActive = true;
cvox.ChromeVox.navigationManager.showOrHideIndicator(true);
cvox.ChromeVoxEventWatcher.init(window);
if (document.activeElement) {
var speakNodeAlso = cvox.ChromeVox.documentHasFocus();
cvox.ApiImplementation.syncToNode(
document.activeElement, speakNodeAlso);
} else {
cvox.ChromeVox.navigationManager.updateIndicator();
}
break;
case cvox.AbstractHost.State.INACTIVE:
cvox.ChromeVox.isActive = false;
cvox.ChromeVox.navigationManager.showOrHideIndicator(false);
// If ChromeVox is inactive, the event watcher will only listen for key
// down events.
cvox.ChromeVoxEventWatcher.init(window);
break;
case cvox.AbstractHost.State.KILLED:
cvox.ChromeVox.isActive = false;
cvox.ChromeVox.navigationManager.showOrHideIndicator(false);
break;
}
};
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