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gecko/dom/browser-element/BrowserElementChildPreload.js

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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/. */
"use strict";
dump("######################## BrowserElementChildPreload.js loaded\n");
var BrowserElementIsReady = false;
let { classes: Cc, interfaces: Ci, results: Cr, utils: Cu } = Components;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/BrowserElementPromptService.jsm");
let kLongestReturnedString = 128;
// Event whitelisted for bubbling.
let whitelistedEvents = [
Ci.nsIDOMKeyEvent.DOM_VK_ESCAPE, // Back button.
Ci.nsIDOMKeyEvent.DOM_VK_SLEEP, // Power button.
Ci.nsIDOMKeyEvent.DOM_VK_CONTEXT_MENU,
Ci.nsIDOMKeyEvent.DOM_VK_F5, // Search button.
Ci.nsIDOMKeyEvent.DOM_VK_PAGE_UP, // Volume up.
Ci.nsIDOMKeyEvent.DOM_VK_PAGE_DOWN // Volume down.
];
function debug(msg) {
//dump("BrowserElementChildPreload - " + msg + "\n");
}
function sendAsyncMsg(msg, data) {
// Ensure that we don't send any messages before BrowserElementChild.js
// finishes loading.
if (!BrowserElementIsReady)
return;
if (!data) {
data = { };
}
data.msg_name = msg;
sendAsyncMessage('browser-element-api:call', data);
}
function sendSyncMsg(msg, data) {
// Ensure that we don't send any messages before BrowserElementChild.js
// finishes loading.
if (!BrowserElementIsReady)
return;
if (!data) {
data = { };
}
data.msg_name = msg;
return sendSyncMessage('browser-element-api:call', data);
}
let CERTIFICATE_ERROR_PAGE_PREF = 'security.alternate_certificate_error_page';
let NS_ERROR_MODULE_BASE_OFFSET = 0x45;
let NS_ERROR_MODULE_SECURITY= 21;
function NS_ERROR_GET_MODULE(err) {
return ((((err) >> 16) - NS_ERROR_MODULE_BASE_OFFSET) & 0x1fff);
}
function NS_ERROR_GET_CODE(err) {
return ((err) & 0xffff);
}
let SEC_ERROR_BASE = Ci.nsINSSErrorsService.NSS_SEC_ERROR_BASE;
let SEC_ERROR_UNKNOWN_ISSUER = (SEC_ERROR_BASE + 13);
let SEC_ERROR_CA_CERT_INVALID = (SEC_ERROR_BASE + 36);
let SEC_ERROR_UNTRUSTED_ISSUER = (SEC_ERROR_BASE + 20);
let SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE = (SEC_ERROR_BASE + 30);
let SEC_ERROR_UNTRUSTED_CERT = (SEC_ERROR_BASE + 21);
let SEC_ERROR_EXPIRED_CERTIFICATE = (SEC_ERROR_BASE + 11);
let SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED = (SEC_ERROR_BASE + 176);
let SSL_ERROR_BASE = Ci.nsINSSErrorsService.NSS_SSL_ERROR_BASE;
let SSL_ERROR_BAD_CERT_DOMAIN = (SSL_ERROR_BASE + 12);
function getErrorClass(errorCode) {
let NSPRCode = -1 * NS_ERROR_GET_CODE(errorCode);
switch (NSPRCode) {
case SEC_ERROR_UNKNOWN_ISSUER:
case SEC_ERROR_UNTRUSTED_ISSUER:
case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
case SEC_ERROR_UNTRUSTED_CERT:
case SSL_ERROR_BAD_CERT_DOMAIN:
case SEC_ERROR_EXPIRED_CERTIFICATE:
case SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED:
return Ci.nsINSSErrorsService.ERROR_CLASS_BAD_CERT;
default:
return Ci.nsINSSErrorsService.ERROR_CLASS_SSL_PROTOCOL;
}
return null;
}
const OBSERVED_EVENTS = [
'fullscreen-origin-change',
'ask-parent-to-exit-fullscreen',
'ask-parent-to-rollback-fullscreen',
'xpcom-shutdown',
'activity-done'
];
/**
* The BrowserElementChild implements one half of <iframe mozbrowser>.
* (The other half is, unsurprisingly, BrowserElementParent.)
*
* This script is injected into an <iframe mozbrowser> via
* nsIMessageManager::LoadFrameScript().
*
* Our job here is to listen for events within this frame and bubble them up to
* the parent process.
*/
var global = this;
function BrowserElementChild() {
// Maps outer window id --> weak ref to window. Used by modal dialog code.
this._windowIDDict = {};
// _forcedVisible corresponds to the visibility state our owner has set on us
// (via iframe.setVisible). ownerVisible corresponds to whether the docShell
// whose window owns this element is visible.
//
// Our docShell is visible iff _forcedVisible and _ownerVisible are both
// true.
this._forcedVisible = true;
this._ownerVisible = true;
this._nextPaintHandler = null;
this._isContentWindowCreated = false;
this._pendingSetInputMethodActive = [];
this._init();
};
BrowserElementChild.prototype = {
QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
Ci.nsISupportsWeakReference]),
_init: function() {
debug("Starting up.");
BrowserElementPromptService.mapWindowToBrowserElementChild(content, this);
docShell.QueryInterface(Ci.nsIWebProgress)
.addProgressListener(this._progressListener,
Ci.nsIWebProgress.NOTIFY_LOCATION |
Ci.nsIWebProgress.NOTIFY_SECURITY |
Ci.nsIWebProgress.NOTIFY_STATE_WINDOW);
docShell.QueryInterface(Ci.nsIWebNavigation)
.sessionHistory = Cc["@mozilla.org/browser/shistory;1"]
.createInstance(Ci.nsISHistory);
// This is necessary to get security web progress notifications.
var securityUI = Cc['@mozilla.org/secure_browser_ui;1']
.createInstance(Ci.nsISecureBrowserUI);
securityUI.init(content);
// A cache of the menuitem dom objects keyed by the id we generate
// and pass to the embedder
this._ctxHandlers = {};
// Counter of contextmenu events fired
this._ctxCounter = 0;
this._shuttingDown = false;
addEventListener('DOMTitleChanged',
this._titleChangedHandler.bind(this),
/* useCapture = */ true,
/* wantsUntrusted = */ false);
addEventListener('DOMLinkAdded',
this._linkAddedHandler.bind(this),
/* useCapture = */ true,
/* wantsUntrusted = */ false);
addEventListener('DOMMetaAdded',
this._metaChangedHandler.bind(this),
/* useCapture = */ true,
/* wantsUntrusted = */ false);
addEventListener('DOMMetaChanged',
this._metaChangedHandler.bind(this),
/* useCapture = */ true,
/* wantsUntrusted = */ false);
addEventListener('DOMMetaRemoved',
this._metaChangedHandler.bind(this),
/* useCapture = */ true,
/* wantsUntrusted = */ false);
// This listens to unload events from our message manager, but /not/ from
// the |content| window. That's because the window's unload event doesn't
// bubble, and we're not using a capturing listener. If we'd used
// useCapture == true, we /would/ hear unload events from the window, which
// is not what we want!
addEventListener('unload',
this._unloadHandler.bind(this),
/* useCapture = */ false,
/* wantsUntrusted = */ false);
// Registers a MozAfterPaint handler for the very first paint.
this._addMozAfterPaintHandler(function () {
sendAsyncMsg('firstpaint');
});
let self = this;
let mmCalls = {
"purge-history": this._recvPurgeHistory,
"get-screenshot": this._recvGetScreenshot,
"set-visible": this._recvSetVisible,
"get-visible": this._recvVisible,
"send-mouse-event": this._recvSendMouseEvent,
"send-touch-event": this._recvSendTouchEvent,
"get-can-go-back": this._recvCanGoBack,
"get-can-go-forward": this._recvCanGoForward,
"go-back": this._recvGoBack,
"go-forward": this._recvGoForward,
"reload": this._recvReload,
"stop": this._recvStop,
"unblock-modal-prompt": this._recvStopWaiting,
"fire-ctx-callback": this._recvFireCtxCallback,
"owner-visibility-change": this._recvOwnerVisibilityChange,
"exit-fullscreen": this._recvExitFullscreen.bind(this),
"activate-next-paint-listener": this._activateNextPaintListener.bind(this),
"set-input-method-active": this._recvSetInputMethodActive.bind(this),
"deactivate-next-paint-listener": this._deactivateNextPaintListener.bind(this)
}
addMessageListener("browser-element-api:call", function(aMessage) {
if (aMessage.data.msg_name in mmCalls) {
return mmCalls[aMessage.data.msg_name].apply(self, arguments);
}
});
let els = Cc["@mozilla.org/eventlistenerservice;1"]
.getService(Ci.nsIEventListenerService);
// We are using the system group for those events so if something in the
// content called .stopPropagation() this will still be called.
els.addSystemEventListener(global, 'keydown',
this._keyEventHandler.bind(this),
/* useCapture = */ true);
els.addSystemEventListener(global, 'keypress',
this._keyEventHandler.bind(this),
/* useCapture = */ true);
els.addSystemEventListener(global, 'keyup',
this._keyEventHandler.bind(this),
/* useCapture = */ true);
els.addSystemEventListener(global, 'DOMWindowClose',
this._windowCloseHandler.bind(this),
/* useCapture = */ false);
els.addSystemEventListener(global, 'DOMWindowCreated',
this._windowCreatedHandler.bind(this),
/* useCapture = */ true);
els.addSystemEventListener(global, 'DOMWindowResize',
this._windowResizeHandler.bind(this),
/* useCapture = */ false);
els.addSystemEventListener(global, 'contextmenu',
this._contextmenuHandler.bind(this),
/* useCapture = */ false);
els.addSystemEventListener(global, 'scroll',
this._scrollEventHandler.bind(this),
/* useCapture = */ false);
OBSERVED_EVENTS.forEach((aTopic) => {
Services.obs.addObserver(this, aTopic, false);
});
},
observe: function(subject, topic, data) {
// Ignore notifications not about our document. (Note that |content| /can/
// be null; see bug 874900.)
if (topic !== 'activity-done' && (!content || subject != content.document))
return;
if (topic == 'activity-done' && docShell !== subject)
return;
switch (topic) {
case 'fullscreen-origin-change':
sendAsyncMsg('fullscreen-origin-change', { _payload_: data });
break;
case 'ask-parent-to-exit-fullscreen':
sendAsyncMsg('exit-fullscreen');
break;
case 'ask-parent-to-rollback-fullscreen':
sendAsyncMsg('rollback-fullscreen');
break;
case 'activity-done':
sendAsyncMsg('activitydone', { success: (data == 'activity-success') });
break;
case 'xpcom-shutdown':
this._shuttingDown = true;
break;
}
},
/**
* Called when our TabChildGlobal starts to die. This is not called when the
* page inside |content| unloads.
*/
_unloadHandler: function() {
this._shuttingDown = true;
OBSERVED_EVENTS.forEach((aTopic) => {
Services.obs.removeObserver(this, aTopic);
});
},
_tryGetInnerWindowID: function(win) {
let utils = win.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDOMWindowUtils);
try {
return utils.currentInnerWindowID;
}
catch(e) {
return null;
}
},
/**
* Show a modal prompt. Called by BrowserElementPromptService.
*/
showModalPrompt: function(win, args) {
let utils = win.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDOMWindowUtils);
args.windowID = { outer: utils.outerWindowID,
inner: this._tryGetInnerWindowID(win) };
sendAsyncMsg('showmodalprompt', args);
let returnValue = this._waitForResult(win);
Services.obs.notifyObservers(null, 'BEC:ShownModalPrompt', null);
if (args.promptType == 'prompt' ||
args.promptType == 'confirm' ||
args.promptType == 'custom-prompt') {
return returnValue;
}
},
/**
* Spin in a nested event loop until we receive a unblock-modal-prompt message for
* this window.
*/
_waitForResult: function(win) {
debug("_waitForResult(" + win + ")");
let utils = win.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDOMWindowUtils);
let outerWindowID = utils.outerWindowID;
let innerWindowID = this._tryGetInnerWindowID(win);
if (innerWindowID === null) {
// I have no idea what waiting for a result means when there's no inner
// window, so let's just bail.
debug("_waitForResult: No inner window. Bailing.");
return;
}
this._windowIDDict[outerWindowID] = Cu.getWeakReference(win);
debug("Entering modal state (outerWindowID=" + outerWindowID + ", " +
"innerWindowID=" + innerWindowID + ")");
utils.enterModalState();
// We'll decrement win.modalDepth when we receive a unblock-modal-prompt message
// for the window.
if (!win.modalDepth) {
win.modalDepth = 0;
}
win.modalDepth++;
let origModalDepth = win.modalDepth;
let thread = Services.tm.currentThread;
debug("Nested event loop - begin");
while (win.modalDepth == origModalDepth && !this._shuttingDown) {
// Bail out of the loop if the inner window changed; that means the
// window navigated. Bail out when we're shutting down because otherwise
// we'll leak our window.
if (this._tryGetInnerWindowID(win) !== innerWindowID) {
debug("_waitForResult: Inner window ID changed " +
"while in nested event loop.");
break;
}
thread.processNextEvent(/* mayWait = */ true);
}
debug("Nested event loop - finish");
// If we exited the loop because the inner window changed, then bail on the
// modal prompt.
if (innerWindowID !== this._tryGetInnerWindowID(win)) {
throw Components.Exception("Modal state aborted by navigation",
Cr.NS_ERROR_NOT_AVAILABLE);
}
let returnValue = win.modalReturnValue;
delete win.modalReturnValue;
if (!this._shuttingDown) {
utils.leaveModalState();
}
debug("Leaving modal state (outerID=" + outerWindowID + ", " +
"innerID=" + innerWindowID + ")");
return returnValue;
},
_recvStopWaiting: function(msg) {
let outerID = msg.json.windowID.outer;
let innerID = msg.json.windowID.inner;
let returnValue = msg.json.returnValue;
debug("recvStopWaiting(outer=" + outerID + ", inner=" + innerID +
", returnValue=" + returnValue + ")");
if (!this._windowIDDict[outerID]) {
debug("recvStopWaiting: No record of outer window ID " + outerID);
return;
}
let win = this._windowIDDict[outerID].get();
delete this._windowIDDict[outerID];
if (!win) {
debug("recvStopWaiting, but window is gone\n");
return;
}
if (innerID !== this._tryGetInnerWindowID(win)) {
debug("recvStopWaiting, but inner ID has changed\n");
return;
}
debug("recvStopWaiting " + win);
win.modalReturnValue = returnValue;
win.modalDepth--;
},
_recvExitFullscreen: function() {
var utils = content.document.defaultView
.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDOMWindowUtils);
utils.exitFullscreen();
},
_titleChangedHandler: function(e) {
debug("Got titlechanged: (" + e.target.title + ")");
var win = e.target.defaultView;
// Ignore titlechanges which don't come from the top-level
// <iframe mozbrowser> window.
if (win == content) {
sendAsyncMsg('titlechange', { _payload_: e.target.title });
}
else {
debug("Not top level!");
}
},
_iconChangedHandler: function(e) {
debug('Got iconchanged: (' + e.target.href + ')');
let icon = { href: e.target.href };
if (e.target.getAttribute('sizes')) {
icon.sizes = e.target.getAttribute('sizes');
}
sendAsyncMsg('iconchange', icon);
},
_openSearchHandler: function(e) {
debug('Got opensearch: (' + e.target.href + ')');
if (e.target.type !== "application/opensearchdescription+xml") {
return;
}
sendAsyncMsg('opensearch', { title: e.target.title,
href: e.target.href });
},
_manifestChangedHandler: function(e) {
debug('Got manifestchanged: (' + e.target.href + ')');
let manifest = { href: e.target.href };
sendAsyncMsg('manifestchange', manifest);
},
// Processes the "rel" field in <link> tags and forward to specific handlers.
_linkAddedHandler: function(e) {
let win = e.target.ownerDocument.defaultView;
// Ignore links which don't come from the top-level
// <iframe mozbrowser> window.
if (win != content) {
debug('Not top level!');
return;
}
let handlers = {
'icon': this._iconChangedHandler,
'search': this._openSearchHandler,
'manifest': this._manifestChangedHandler
};
debug('Got linkAdded: (' + e.target.href + ') ' + e.target.rel);
e.target.rel.split(' ').forEach(function(x) {
let token = x.toLowerCase();
if (handlers[token]) {
handlers[token](e);
}
}, this);
},
_metaChangedHandler: function(e) {
let win = e.target.ownerDocument.defaultView;
// Ignore metas which don't come from the top-level
// <iframe mozbrowser> window.
if (win != content) {
debug('Not top level!');
return;
}
if (!e.target.name) {
return;
}
debug('Got metaChanged: (' + e.target.name + ') ' + e.target.content);
let handlers = {
'theme-color': this._themeColorChangedHandler,
'application-name': this._applicationNameChangedHandler
};
let handler = handlers[e.target.name];
if (handler) {
handler(e.type, e.target);
}
},
_applicationNameChangedHandler: function(eventType, target) {
if (eventType !== 'DOMMetaAdded') {
// Bug 1037448 - Decide what to do when <meta name="application-name">
// changes
return;
}
let meta = { name: 'application-name',
content: target.content };
let lang;
let elm;
for (elm = target;
!lang && elm && elm.nodeType == target.ELEMENT_NODE;
elm = elm.parentNode) {
if (elm.hasAttribute('lang')) {
lang = elm.getAttribute('lang');
continue;
}
if (elm.hasAttributeNS('http://www.w3.org/XML/1998/namespace', 'lang')) {
lang = elm.getAttributeNS('http://www.w3.org/XML/1998/namespace', 'lang');
continue;
}
}
// No lang has been detected.
if (!lang && elm.nodeType == target.DOCUMENT_NODE) {
lang = elm.contentLanguage;
}
if (lang) {
meta.lang = lang;
}
sendAsyncMsg('metachange', meta);
},
_themeColorChangedHandler: function(eventType, target) {
let meta = {
name: 'theme-color',
content: target.content,
type: eventType.replace('DOMMeta', '').toLowerCase()
};
sendAsyncMsg('metachange', meta);
},
_addMozAfterPaintHandler: function(callback) {
function onMozAfterPaint() {
let uri = docShell.QueryInterface(Ci.nsIWebNavigation).currentURI;
if (uri.spec != "about:blank") {
debug("Got afterpaint event: " + uri.spec);
removeEventListener('MozAfterPaint', onMozAfterPaint,
/* useCapture = */ true);
callback();
}
}
addEventListener('MozAfterPaint', onMozAfterPaint, /* useCapture = */ true);
return onMozAfterPaint;
},
_removeMozAfterPaintHandler: function(listener) {
removeEventListener('MozAfterPaint', listener,
/* useCapture = */ true);
},
_activateNextPaintListener: function(e) {
if (!this._nextPaintHandler) {
this._nextPaintHandler = this._addMozAfterPaintHandler(function () {
this._nextPaintHandler = null;
sendAsyncMsg('nextpaint');
}.bind(this));
}
},
_deactivateNextPaintListener: function(e) {
if (this._nextPaintHandler) {
this._removeMozAfterPaintHandler(this._nextPaintHandler);
this._nextPaintHandler = null;
}
},
_windowCloseHandler: function(e) {
let win = e.target;
if (win != content || e.defaultPrevented) {
return;
}
debug("Closing window " + win);
sendAsyncMsg('close');
// Inform the window implementation that we handled this close ourselves.
e.preventDefault();
},
_windowCreatedHandler: function(e) {
let targetDocShell = e.target.defaultView
.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIWebNavigation);
if (targetDocShell != docShell) {
return;
}
let uri = docShell.QueryInterface(Ci.nsIWebNavigation).currentURI;
debug("Window created: " + uri.spec);
if (uri.spec != "about:blank") {
this._addMozAfterPaintHandler(function () {
sendAsyncMsg('documentfirstpaint');
});
this._isContentWindowCreated = true;
// Handle pending SetInputMethodActive request.
while (this._pendingSetInputMethodActive.length > 0) {
this._recvSetInputMethodActive(this._pendingSetInputMethodActive.shift());
}
}
},
_windowResizeHandler: function(e) {
let win = e.target;
if (win != content || e.defaultPrevented) {
return;
}
debug("resizing window " + win);
sendAsyncMsg('resize', { width: e.detail.width, height: e.detail.height });
// Inform the window implementation that we handled this resize ourselves.
e.preventDefault();
},
_contextmenuHandler: function(e) {
debug("Got contextmenu");
if (e.defaultPrevented) {
return;
}
this._ctxCounter++;
this._ctxHandlers = {};
var elem = e.target;
var menuData = {systemTargets: [], contextmenu: null};
var ctxMenuId = null;
while (elem && elem.parentNode) {
var ctxData = this._getSystemCtxMenuData(elem);
if (ctxData) {
menuData.systemTargets.push({
nodeName: elem.nodeName,
data: ctxData
});
}
if (!ctxMenuId && 'hasAttribute' in elem && elem.hasAttribute('contextmenu')) {
ctxMenuId = elem.getAttribute('contextmenu');
}
elem = elem.parentNode;
}
if (ctxMenuId) {
var menu = e.target.ownerDocument.getElementById(ctxMenuId);
if (menu) {
menuData.contextmenu = this._buildMenuObj(menu, '');
}
}
// The value returned by the contextmenu sync call is true iff the embedder
// called preventDefault() on its contextmenu event.
//
// We call preventDefault() on our contextmenu event iff the embedder called
// preventDefault() on /its/ contextmenu event. This way, if the embedder
// ignored the contextmenu event, TabChild will fire a click.
if (sendSyncMsg('contextmenu', menuData)[0]) {
e.preventDefault();
} else {
this._ctxHandlers = {};
}
},
_getSystemCtxMenuData: function(elem) {
if ((elem instanceof Ci.nsIDOMHTMLAnchorElement && elem.href) ||
(elem instanceof Ci.nsIDOMHTMLAreaElement && elem.href)) {
return {uri: elem.href,
text: elem.textContent.substring(0, kLongestReturnedString)};
}
if (elem instanceof Ci.nsIImageLoadingContent && elem.currentURI) {
return {uri: elem.currentURI.spec};
}
if (elem instanceof Ci.nsIDOMHTMLImageElement) {
return {uri: elem.src};
}
if (elem instanceof Ci.nsIDOMHTMLMediaElement) {
let hasVideo = !(elem.readyState >= elem.HAVE_METADATA &&
(elem.videoWidth == 0 || elem.videoHeight == 0));
return {uri: elem.currentSrc || elem.src, hasVideo: hasVideo};
}
return false;
},
_scrollEventHandler: function(e) {
let win = e.target.defaultView;
if (win != content) {
return;
}
debug("scroll event " + win);
sendAsyncMsg("scroll", { top: win.scrollY, left: win.scrollX });
},
_recvPurgeHistory: function(data) {
debug("Received purgeHistory message: (" + data.json.id + ")");
let history = docShell.QueryInterface(Ci.nsIWebNavigation).sessionHistory;
try {
if (history && history.count) {
history.PurgeHistory(history.count);
}
} catch(e) {}
sendAsyncMsg('got-purge-history', { id: data.json.id, successRv: true });
},
_recvGetScreenshot: function(data) {
debug("Received getScreenshot message: (" + data.json.id + ")");
let self = this;
let maxWidth = data.json.args.width;
let maxHeight = data.json.args.height;
let mimeType = data.json.args.mimeType;
let domRequestID = data.json.id;
let takeScreenshotClosure = function() {
self._takeScreenshot(maxWidth, maxHeight, mimeType, domRequestID);
};
let maxDelayMS = 2000;
try {
maxDelayMS = Services.prefs.getIntPref('dom.browserElement.maxScreenshotDelayMS');
}
catch(e) {}
// Try to wait for the event loop to go idle before we take the screenshot,
// but once we've waited maxDelayMS milliseconds, go ahead and take it
// anyway.
Cc['@mozilla.org/message-loop;1'].getService(Ci.nsIMessageLoop).postIdleTask(
takeScreenshotClosure, maxDelayMS);
},
/**
* Actually take a screenshot and foward the result up to our parent, given
* the desired maxWidth and maxHeight (in CSS pixels), and given the
* DOMRequest ID associated with the request from the parent.
*/
_takeScreenshot: function(maxWidth, maxHeight, mimeType, domRequestID) {
// You can think of the screenshotting algorithm as carrying out the
// following steps:
//
// - Calculate maxWidth, maxHeight, and viewport's width and height in the
// dimension of device pixels by multiply the numbers with
// window.devicePixelRatio.
//
// - Let scaleWidth be the factor by which we'd need to downscale the
// viewport pixel width so it would fit within maxPixelWidth.
// (If the viewport's pixel width is less than maxPixelWidth, let
// scaleWidth be 1.) Compute scaleHeight the same way.
//
// - Scale the viewport by max(scaleWidth, scaleHeight). Now either the
// viewport's width is no larger than maxWidth, the viewport's height is
// no larger than maxHeight, or both.
//
// - Crop the viewport so its width is no larger than maxWidth and its
// height is no larger than maxHeight.
//
// - Set mozOpaque to true and background color to solid white
// if we are taking a JPEG screenshot, keep transparent if otherwise.
//
// - Return a screenshot of the page's viewport scaled and cropped per
// above.
debug("Taking a screenshot: maxWidth=" + maxWidth +
", maxHeight=" + maxHeight +
", mimeType=" + mimeType +
", domRequestID=" + domRequestID + ".");
if (!content) {
// If content is not loaded yet, bail out since even sendAsyncMessage
// fails...
debug("No content yet!");
return;
}
let devicePixelRatio = content.devicePixelRatio;
let maxPixelWidth = Math.round(maxWidth * devicePixelRatio);
let maxPixelHeight = Math.round(maxHeight * devicePixelRatio);
let contentPixelWidth = content.innerWidth * devicePixelRatio;
let contentPixelHeight = content.innerHeight * devicePixelRatio;
let scaleWidth = Math.min(1, maxPixelWidth / contentPixelWidth);
let scaleHeight = Math.min(1, maxPixelHeight / contentPixelHeight);
let scale = Math.max(scaleWidth, scaleHeight);
let canvasWidth =
Math.min(maxPixelWidth, Math.round(contentPixelWidth * scale));
let canvasHeight =
Math.min(maxPixelHeight, Math.round(contentPixelHeight * scale));
let transparent = (mimeType !== 'image/jpeg');
var canvas = content.document
.createElementNS("http://www.w3.org/1999/xhtml", "canvas");
if (!transparent)
canvas.mozOpaque = true;
canvas.width = canvasWidth;
canvas.height = canvasHeight;
let ctx = canvas.getContext("2d", { willReadFrequently: true });
ctx.scale(scale * devicePixelRatio, scale * devicePixelRatio);
let flags = ctx.DRAWWINDOW_DRAW_VIEW |
ctx.DRAWWINDOW_USE_WIDGET_LAYERS |
ctx.DRAWWINDOW_DO_NOT_FLUSH |
ctx.DRAWWINDOW_ASYNC_DECODE_IMAGES;
ctx.drawWindow(content, 0, 0, content.innerWidth, content.innerHeight,
transparent ? "rgba(255,255,255,0)" : "rgb(255,255,255)",
flags);
// Take a JPEG screenshot by default instead of PNG with alpha channel.
// This requires us to unpremultiply the alpha channel, which
// is expensive on ARM processors because they lack a hardware integer
// division instruction.
canvas.toBlob(function(blob) {
sendAsyncMsg('got-screenshot', {
id: domRequestID,
successRv: blob
});
}, mimeType);
},
_recvFireCtxCallback: function(data) {
debug("Received fireCtxCallback message: (" + data.json.menuitem + ")");
// We silently ignore if the embedder uses an incorrect id in the callback
if (data.json.menuitem in this._ctxHandlers) {
this._ctxHandlers[data.json.menuitem].click();
this._ctxHandlers = {};
} else {
debug("Ignored invalid contextmenu invocation");
}
},
_buildMenuObj: function(menu, idPrefix) {
function maybeCopyAttribute(src, target, attribute) {
if (src.getAttribute(attribute)) {
target[attribute] = src.getAttribute(attribute);
}
}
var menuObj = {type: 'menu', items: []};
maybeCopyAttribute(menu, menuObj, 'label');
for (var i = 0, child; child = menu.children[i++];) {
if (child.nodeName === 'MENU') {
menuObj.items.push(this._buildMenuObj(child, idPrefix + i + '_'));
} else if (child.nodeName === 'MENUITEM') {
var id = this._ctxCounter + '_' + idPrefix + i;
var menuitem = {id: id, type: 'menuitem'};
maybeCopyAttribute(child, menuitem, 'label');
maybeCopyAttribute(child, menuitem, 'icon');
this._ctxHandlers[id] = child;
menuObj.items.push(menuitem);
}
}
return menuObj;
},
_recvSetVisible: function(data) {
debug("Received setVisible message: (" + data.json.visible + ")");
if (this._forcedVisible == data.json.visible) {
return;
}
this._forcedVisible = data.json.visible;
this._updateVisibility();
},
_recvVisible: function(data) {
sendAsyncMsg('got-visible', {
id: data.json.id,
successRv: docShell.isActive
});
},
/**
* Called when the window which contains this iframe becomes hidden or
* visible.
*/
_recvOwnerVisibilityChange: function(data) {
debug("Received ownerVisibilityChange: (" + data.json.visible + ")");
this._ownerVisible = data.json.visible;
this._updateVisibility();
},
_updateVisibility: function() {
var visible = this._forcedVisible && this._ownerVisible;
if (docShell.isActive !== visible) {
docShell.isActive = visible;
sendAsyncMsg('visibilitychange', {visible: visible});
}
},
_recvSendMouseEvent: function(data) {
let json = data.json;
let utils = content.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDOMWindowUtils);
utils.sendMouseEventToWindow(json.type, json.x, json.y, json.button,
json.clickCount, json.modifiers);
},
_recvSendTouchEvent: function(data) {
let json = data.json;
let utils = content.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDOMWindowUtils);
utils.sendTouchEventToWindow(json.type, json.identifiers, json.touchesX,
json.touchesY, json.radiisX, json.radiisY,
json.rotationAngles, json.forces, json.count,
json.modifiers);
},
_recvCanGoBack: function(data) {
var webNav = docShell.QueryInterface(Ci.nsIWebNavigation);
sendAsyncMsg('got-can-go-back', {
id: data.json.id,
successRv: webNav.canGoBack
});
},
_recvCanGoForward: function(data) {
var webNav = docShell.QueryInterface(Ci.nsIWebNavigation);
sendAsyncMsg('got-can-go-forward', {
id: data.json.id,
successRv: webNav.canGoForward
});
},
_recvGoBack: function(data) {
try {
docShell.QueryInterface(Ci.nsIWebNavigation).goBack();
} catch(e) {
// Silently swallow errors; these happen when we can't go back.
}
},
_recvGoForward: function(data) {
try {
docShell.QueryInterface(Ci.nsIWebNavigation).goForward();
} catch(e) {
// Silently swallow errors; these happen when we can't go forward.
}
},
_recvReload: function(data) {
let webNav = docShell.QueryInterface(Ci.nsIWebNavigation);
let reloadFlags = data.json.hardReload ?
webNav.LOAD_FLAGS_BYPASS_PROXY | webNav.LOAD_FLAGS_BYPASS_CACHE :
webNav.LOAD_FLAGS_NONE;
try {
webNav.reload(reloadFlags);
} catch(e) {
// Silently swallow errors; these can happen if a used cancels reload
}
},
_recvStop: function(data) {
let webNav = docShell.QueryInterface(Ci.nsIWebNavigation);
webNav.stop(webNav.STOP_NETWORK);
},
_recvSetInputMethodActive: function(data) {
let msgData = { id: data.json.id };
if (!this._isContentWindowCreated) {
if (data.json.args.isActive) {
// To activate the input method, we should wait before the content
// window is ready.
this._pendingSetInputMethodActive.push(data);
return;
}
msgData.successRv = null;
sendAsyncMsg('got-set-input-method-active', msgData);
return;
}
// Unwrap to access webpage content.
let nav = XPCNativeWrapper.unwrap(content.document.defaultView.navigator);
if (nav.mozInputMethod) {
// Wrap to access the chrome-only attribute setActive.
new XPCNativeWrapper(nav.mozInputMethod).setActive(data.json.args.isActive);
msgData.successRv = null;
} else {
msgData.errorMsg = 'Cannot access mozInputMethod.';
}
sendAsyncMsg('got-set-input-method-active', msgData);
},
_keyEventHandler: function(e) {
if (whitelistedEvents.indexOf(e.keyCode) != -1 && !e.defaultPrevented) {
sendAsyncMsg('keyevent', {
type: e.type,
keyCode: e.keyCode,
charCode: e.charCode,
});
}
},
// The docShell keeps a weak reference to the progress listener, so we need
// to keep a strong ref to it ourselves.
_progressListener: {
QueryInterface: XPCOMUtils.generateQI([Ci.nsIWebProgressListener,
Ci.nsISupportsWeakReference]),
_seenLoadStart: false,
onLocationChange: function(webProgress, request, location, flags) {
// We get progress events from subshells here, which is kind of weird.
if (webProgress != docShell) {
return;
}
// Ignore locationchange events which occur before the first loadstart.
// These are usually about:blank loads we don't care about.
if (!this._seenLoadStart) {
return;
}
// Remove password and wyciwyg from uri.
location = Cc["@mozilla.org/docshell/urifixup;1"]
.getService(Ci.nsIURIFixup).createExposableURI(location);
sendAsyncMsg('locationchange', { _payload_: location.spec });
},
onStateChange: function(webProgress, request, stateFlags, status) {
if (webProgress != docShell) {
return;
}
if (stateFlags & Ci.nsIWebProgressListener.STATE_START) {
this._seenLoadStart = true;
sendAsyncMsg('loadstart');
}
if (stateFlags & Ci.nsIWebProgressListener.STATE_STOP) {
let bgColor = 'transparent';
try {
bgColor = content.getComputedStyle(content.document.body)
.getPropertyValue('background-color');
} catch (e) {}
sendAsyncMsg('loadend', {backgroundColor: bgColor});
// Ignoring NS_BINDING_ABORTED, which is set when loading page is
// stopped.
if (status == Cr.NS_OK ||
status == Cr.NS_BINDING_ABORTED) {
return;
}
if (NS_ERROR_GET_MODULE(status) == NS_ERROR_MODULE_SECURITY &&
getErrorClass(status) == Ci.nsINSSErrorsService.ERROR_CLASS_BAD_CERT) {
// XXX Is there a point firing the event if the error page is not
// certerror? If yes, maybe we should add a property to the
// event to to indicate whether there is a custom page. That would
// let the embedder have more control over the desired behavior.
var errorPage = null;
try {
errorPage = Services.prefs.getCharPref(CERTIFICATE_ERROR_PAGE_PREF);
} catch(e) {}
if (errorPage == 'certerror') {
sendAsyncMsg('error', { type: 'certerror' });
return;
}
}
// TODO See nsDocShell::DisplayLoadError for a list of all the error
// codes (the status param) we should eventually handle here.
sendAsyncMsg('error', { type: 'other' });
}
},
onSecurityChange: function(webProgress, request, state) {
if (webProgress != docShell) {
return;
}
var stateDesc;
if (state & Ci.nsIWebProgressListener.STATE_IS_SECURE) {
stateDesc = 'secure';
}
else if (state & Ci.nsIWebProgressListener.STATE_IS_BROKEN) {
stateDesc = 'broken';
}
else if (state & Ci.nsIWebProgressListener.STATE_IS_INSECURE) {
stateDesc = 'insecure';
}
else {
debug("Unexpected securitychange state!");
stateDesc = '???';
}
// XXX Until bug 764496 is fixed, this will always return false.
var isEV = !!(state & Ci.nsIWebProgressListener.STATE_IDENTITY_EV_TOPLEVEL);
sendAsyncMsg('securitychange', { state: stateDesc, extendedValidation: isEV });
},
onStatusChange: function(webProgress, request, status, message) {},
onProgressChange: function(webProgress, request, curSelfProgress,
maxSelfProgress, curTotalProgress, maxTotalProgress) {},
},
// Expose the message manager for WebApps and others.
_messageManagerPublic: {
sendAsyncMessage: global.sendAsyncMessage.bind(global),
sendSyncMessage: global.sendSyncMessage.bind(global),
addMessageListener: global.addMessageListener.bind(global),
removeMessageListener: global.removeMessageListener.bind(global)
},
get messageManager() {
return this._messageManagerPublic;
}
};
var api = new BrowserElementChild();
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