gecko/browser/base/content/content.js

/* -*- 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/. */

let Cc = Components.classes;
let Ci = Components.interfaces;
let Cu = Components.utils;

Cu.import("resource://gre/modules/XPCOMUtils.jsm");

XPCOMUtils.defineLazyModuleGetter(this,
  "LoginManagerContent", "resource://gre/modules/LoginManagerContent.jsm");
XPCOMUtils.defineLazyModuleGetter(this,
  "InsecurePasswordUtils", "resource://gre/modules/InsecurePasswordUtils.jsm");

// Bug 671101 - directly using webNavigation in this context
// causes docshells to leak
this.__defineGetter__("webNavigation", function () {
  return docShell.QueryInterface(Ci.nsIWebNavigation);
});

addMessageListener("WebNavigation:LoadURI", function (message) {
  let flags = message.json.flags || webNavigation.LOAD_FLAGS_NONE;

  webNavigation.loadURI(message.json.uri, flags, null, null, null);
});

addMessageListener("Browser:HideSessionRestoreButton", function (message) {
  // Hide session restore button on about:home
  let doc = content.document;
  let container;
  if (doc.documentURI.toLowerCase() == "about:home" &&
      (container = doc.getElementById("sessionRestoreContainer"))){
    container.hidden = true;
  }
});

if (Services.prefs.getBoolPref("browser.tabs.remote")) {
  addEventListener("contextmenu", function (event) {
    sendAsyncMessage("contextmenu", {}, { event: event });
  }, false);
} else {
  addEventListener("DOMContentLoaded", function(event) {
    LoginManagerContent.onContentLoaded(event);
  });
  addEventListener("DOMFormHasPassword", function(event) {
    InsecurePasswordUtils.checkForInsecurePasswords(event.target);
  });
  addEventListener("DOMAutoComplete", function(event) {
    LoginManagerContent.onUsernameInput(event);
  });
  addEventListener("blur", function(event) {
    LoginManagerContent.onUsernameInput(event);
  });
}


var global = this;

let ClickEventHandler = {
  init: function init() {
    Cc["@mozilla.org/eventlistenerservice;1"]
      .getService(Ci.nsIEventListenerService)
      .addSystemEventListener(global, "click", this, true);
  },

  handleEvent: function(event) {
    // Bug 903016: Most of this code is an unfortunate duplication from
    // contentAreaClick in browser.js.
    if (!event.isTrusted || event.defaultPrevented || event.button == 2)
      return;

    let [href, node] = this._hrefAndLinkNodeForClickEvent(event);

    let json = { button: event.button, shiftKey: event.shiftKey,
                 ctrlKey: event.ctrlKey, metaKey: event.metaKey,
                 altKey: event.altKey, href: null, title: null,
                 bookmark: false };

    if (href) {
      json.href = href;
      if (node) {
        json.title = node.getAttribute("title");

        if (event.button == 0 && !event.ctrlKey && !event.shiftKey &&
            !event.altKey && !event.metaKey) {
          json.bookmark = node.getAttribute("rel") == "sidebar";
          if (json.bookmark)
            event.preventDefault(); // Need to prevent the pageload.
        }
      }

      sendAsyncMessage("Content:Click", json);
      return;
    }

    // This might be middle mouse navigation.
    if (event.button == 1)
      sendAsyncMessage("Content:Click", json);
  },

  /**
   * Extracts linkNode and href for the current click target.
   *
   * @param event
   *        The click event.
   * @return [href, linkNode].
   *
   * @note linkNode will be null if the click wasn't on an anchor
   *       element (or XLink).
   */
  _hrefAndLinkNodeForClickEvent: function(event) {
    function isHTMLLink(aNode) {
      // Be consistent with what nsContextMenu.js does.
      return ((aNode instanceof content.HTMLAnchorElement && aNode.href) ||
              (aNode instanceof content.HTMLAreaElement && aNode.href) ||
              aNode instanceof content.HTMLLinkElement);
    }

    function makeURLAbsolute(aBase, aUrl) {
      // Note:  makeURI() will throw if aUri is not a valid URI
      return makeURI(aUrl, null, makeURI(aBase)).spec;
    }

    let node = event.target;
    while (node && !isHTMLLink(node)) {
      node = node.parentNode;
    }

    if (node)
      return [node.href, node];

    // If there is no linkNode, try simple XLink.
    let href, baseURI;
    node = event.target;
    while (node && !href) {
      if (node.nodeType == content.Node.ELEMENT_NODE) {
        href = node.getAttributeNS("http://www.w3.org/1999/xlink", "href");
        if (href)
          baseURI = node.baseURI;
      }
      node = node.parentNode;
    }

    // In case of XLink, we don't return the node we got href from since
    // callers expect <a>-like elements.
    return [href ? makeURLAbsolute(baseURI, href) : null, null];
  }
};
ClickEventHandler.init();