gecko/toolkit/modules/BrowserUtils.jsm

91 lines
2.8 KiB
JavaScript

/* 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";
this.EXPORTED_SYMBOLS = [ "BrowserUtils" ];
const {interfaces: Ci, utils: Cu} = Components;
Cu.import("resource://gre/modules/Services.jsm");
this.BrowserUtils = {
/**
* urlSecurityCheck: JavaScript wrapper for checkLoadURIWithPrincipal
* and checkLoadURIStrWithPrincipal.
* If |aPrincipal| is not allowed to link to |aURL|, this function throws with
* an error message.
*
* @param aURL
* The URL a page has linked to. This could be passed either as a string
* or as a nsIURI object.
* @param aPrincipal
* The principal of the document from which aURL came.
* @param aFlags
* Flags to be passed to checkLoadURIStr. If undefined,
* nsIScriptSecurityManager.STANDARD will be passed.
*/
urlSecurityCheck: function(aURL, aPrincipal, aFlags) {
var secMan = Services.scriptSecurityManager;
if (aFlags === undefined) {
aFlags = secMan.STANDARD;
}
try {
if (aURL instanceof Ci.nsIURI)
secMan.checkLoadURIWithPrincipal(aPrincipal, aURL, aFlags);
else
secMan.checkLoadURIStrWithPrincipal(aPrincipal, aURL, aFlags);
} catch (e) {
let principalStr = "";
try {
principalStr = " from " + aPrincipal.URI.spec;
}
catch(e2) { }
throw "Load of " + aURL + principalStr + " denied.";
}
},
/**
* Constructs a new URI, using nsIIOService.
* @param aURL The URI spec.
* @param aOriginCharset The charset of the URI.
* @param aBaseURI Base URI to resolve aURL, or null.
* @return an nsIURI object based on aURL.
*/
makeURI: function(aURL, aOriginCharset, aBaseURI) {
return Services.io.newURI(aURL, aOriginCharset, aBaseURI);
},
makeFileURI: function(aFile) {
return Services.io.newFileURI(aFile);
},
/**
* For a given DOM element, returns its position in "screen"
* coordinates. In a content process, the coordinates returned will
* be relative to the left/top of the tab. In the chrome process,
* the coordinates are relative to the user's screen.
*/
getElementBoundingScreenRect: function(aElement) {
let rect = aElement.getBoundingClientRect();
let window = aElement.ownerDocument.defaultView;
// We need to compensate for any iframes that might shift things
// over. We also need to compensate for zooming.
let fullZoom = window.getInterface(Ci.nsIDOMWindowUtils).fullZoom;
rect = {
left: (rect.left + window.mozInnerScreenX) * fullZoom,
top: (rect.top + window.mozInnerScreenY) * fullZoom,
width: rect.width * fullZoom,
height: rect.height * fullZoom
};
return rect;
},
};