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# -*- Mode: javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
# 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/.
/**
* The Feed Handler object manages discovery of RSS/ATOM feeds in web pages
* and shows UI when they are discovered.
*/
var FeedHandler = {
/** Called when the user clicks on the Subscribe to This Page... menu item,
* or when the user clicks the feed button when the page contains multiple
* feeds.
* Builds a menu of unique feeds associated with the page, and if there
* is only one, shows the feed inline in the browser window.
* @param container
* The feed list container (menupopup or subview) to be populated.
* @param isSubview
* Whether we're creating a subview (true) or menu (false/undefined)
* @returns true if the menu/subview should be shown, false if there was only
* one feed and the feed should be shown inline in the browser
* window (do not show the menupopup/subview).
*/
buildFeedList: function(container, isSubview) {
var feeds = gBrowser.selectedBrowser.feeds;
if (!isSubview && feeds == null) {
// XXX hack -- menu opening depends on setting of an "open"
// attribute, and the menu refuses to open if that attribute is
// set (because it thinks it's already open). onpopupshowing gets
// called after the attribute is unset, and it doesn't get unset
// if we return false. so we unset it here; otherwise, the menu
// refuses to work past this point.
container.parentNode.removeAttribute("open");
return false;
}
for (let i = container.childNodes.length - 1; i >= 0; --i) {
let node = container.childNodes[i];
if (isSubview && node.localName == "label")
continue;
container.removeChild(node);
}
if (!feeds || feeds.length <= 1)
return false;
// Build the menu showing the available feed choices for viewing.
var itemNodeType = isSubview ? "toolbarbutton" : "menuitem";
for (let feedInfo of feeds) {
var item = document.createElement(itemNodeType);
var baseTitle = feedInfo.title || feedInfo.href;
var labelStr = gNavigatorBundle.getFormattedString("feedShowFeedNew", [baseTitle]);
item.setAttribute("label", labelStr);
item.setAttribute("feed", feedInfo.href);
item.setAttribute("tooltiptext", feedInfo.href);
item.setAttribute("crop", "center");
let className = "feed-" + itemNodeType;
if (isSubview) {
className += " subviewbutton";
}
item.setAttribute("class", className);
container.appendChild(item);
}
return true;
},
/**
* Subscribe to a given feed. Called when
* 1. Page has a single feed and user clicks feed icon in location bar
* 2. Page has a single feed and user selects Subscribe menu item
* 3. Page has multiple feeds and user selects from feed icon popup (or subview)
* 4. Page has multiple feeds and user selects from Subscribe submenu
* @param href
* The feed to subscribe to. May be null, in which case the
* event target's feed attribute is examined.
* @param event
* The event this method is handling. Used to decide where
* to open the preview UI. (Optional, unless href is null)
*/
subscribeToFeed: function(href, event) {
// Just load the feed in the content area to either subscribe or show the
// preview UI
if (!href)
href = event.target.getAttribute("feed");
urlSecurityCheck(href, gBrowser.contentPrincipal,
Ci.nsIScriptSecurityManager.DISALLOW_INHERIT_PRINCIPAL);
var feedURI = makeURI(href, document.characterSet);
// Use the feed scheme so X-Moz-Is-Feed will be set
// The value doesn't matter
if (/^https?$/.test(feedURI.scheme))
href = "feed:" + href;
this.loadFeed(href, event);
},
loadFeed: function(href, event) {
var feeds = gBrowser.selectedBrowser.feeds;
try {
openUILink(href, event, { ignoreAlt: true });
}
finally {
// We might default to a livebookmarks modal dialog,
// so reset that if the user happens to click it again
gBrowser.selectedBrowser.feeds = feeds;
}
},
get _feedMenuitem() {
delete this._feedMenuitem;
return this._feedMenuitem = document.getElementById("singleFeedMenuitemState");
},
get _feedMenupopup() {
delete this._feedMenupopup;
return this._feedMenupopup = document.getElementById("multipleFeedsMenuState");
},
/**
* Update the browser UI to show whether or not feeds are available when
* a page is loaded or the user switches tabs to a page that has feeds.
*/
updateFeeds: function() {
if (this._updateFeedTimeout)
clearTimeout(this._updateFeedTimeout);
var feeds = gBrowser.selectedBrowser.feeds;
var haveFeeds = feeds && feeds.length > 0;
var feedButton = document.getElementById("feed-button");
if (feedButton) {
if (haveFeeds) {
feedButton.removeAttribute("disabled");
} else {
feedButton.setAttribute("disabled", "true");
}
}
if (!haveFeeds) {
this._feedMenuitem.setAttribute("disabled", "true");
this._feedMenuitem.removeAttribute("hidden");
this._feedMenupopup.setAttribute("hidden", "true");
return;
}
if (feeds.length > 1) {
this._feedMenuitem.setAttribute("hidden", "true");
this._feedMenupopup.removeAttribute("hidden");
} else {
this._feedMenuitem.setAttribute("feed", feeds[0].href);
this._feedMenuitem.removeAttribute("disabled");
this._feedMenuitem.removeAttribute("hidden");
this._feedMenupopup.setAttribute("hidden", "true");
}
},
addFeed: function(link, browserForLink) {
if (!browserForLink.feeds)
browserForLink.feeds = [];
browserForLink.feeds.push({ href: link.href, title: link.title });
// If this addition was for the current browser, update the UI. For
// background browsers, we'll update on tab switch.
if (browserForLink == gBrowser.selectedBrowser) {
// Batch updates to avoid updating the UI for multiple onLinkAdded events
// fired within 100ms of each other.
if (this._updateFeedTimeout)
clearTimeout(this._updateFeedTimeout);
this._updateFeedTimeout = setTimeout(this.updateFeeds.bind(this), 100);
}
}
};
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