зеркало из https://github.com/mozilla/gecko-dev.git
122 строки
4.1 KiB
C++
122 строки
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU Public License (the "GPL"), in which case the
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* provisions of the GPL are applicable instead of those above.
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* If you wish to allow use of your version of this file only
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* under the terms of the GPL and not to allow others to use your
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* version of this file under the NPL, indicate your decision by
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* deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete
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* the provisions above, a recipient may use your version of this
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* file under either the NPL or the GPL.
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*/
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/* A namespace class for static layout utilities. */
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#include "jsapi.h"
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#include "nsCOMPtr.h"
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#include "nsIScriptGlobalObject.h"
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#include "nsIScriptContext.h"
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#include "nsLayoutUtils.h"
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// static
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nsresult
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nsLayoutUtils::GetStaticScriptGlobal(JSContext* aContext,
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JSObject* aObj,
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nsIScriptGlobalObject** aNativeGlobal)
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{
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nsISupports* supports;
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JSClass* clazz;
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JSObject* parent;
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JSObject* glob = aObj; // starting point for search
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if (!glob)
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return NS_ERROR_FAILURE;
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while (nsnull != (parent = JS_GetParent(aContext, glob)))
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glob = parent;
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#ifdef JS_THREADSAFE
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clazz = JS_GetClass(aContext, glob);
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#else
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clazz = JS_GetClass(glob);
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#endif
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if (!clazz ||
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!(clazz->flags & JSCLASS_HAS_PRIVATE) ||
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!(clazz->flags & JSCLASS_PRIVATE_IS_NSISUPPORTS) ||
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!(supports = (nsISupports*) JS_GetPrivate(aContext, glob))) {
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return NS_ERROR_FAILURE;
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}
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return supports->QueryInterface(NS_GET_IID(nsIScriptGlobalObject),
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(void**) aNativeGlobal);
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}
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//static
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nsresult
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nsLayoutUtils::GetStaticScriptContext(JSContext* aContext,
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JSObject* aObj,
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nsIScriptContext** aScriptContext)
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{
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nsCOMPtr<nsIScriptGlobalObject> nativeGlobal;
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GetStaticScriptGlobal(aContext, aObj, getter_AddRefs(nativeGlobal));
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if (!nativeGlobal)
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return NS_ERROR_FAILURE;
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nsIScriptContext* scriptContext = nsnull;
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nativeGlobal->GetContext(&scriptContext);
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*aScriptContext = scriptContext;
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return scriptContext ? NS_OK : NS_ERROR_FAILURE;
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}
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//static
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nsresult
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nsLayoutUtils::GetDynamicScriptGlobal(JSContext* aContext,
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nsIScriptGlobalObject** aNativeGlobal)
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{
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nsIScriptGlobalObject* nativeGlobal = nsnull;
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nsCOMPtr<nsIScriptContext> scriptCX;
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GetDynamicScriptContext(aContext, getter_AddRefs(scriptCX));
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if (scriptCX) {
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*aNativeGlobal = nativeGlobal = scriptCX->GetGlobalObject();
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}
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return nativeGlobal ? NS_OK : NS_ERROR_FAILURE;
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}
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//static
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nsresult
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nsLayoutUtils::GetDynamicScriptContext(JSContext *aContext,
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nsIScriptContext** aScriptContext)
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{
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// XXX We rely on the rule that if any JSContext in our JSRuntime has a
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// private set then that private *must* be a pointer to an nsISupports.
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nsISupports *supports = (nsIScriptContext*) JS_GetContextPrivate(aContext);
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if (!supports)
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return nsnull;
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return supports->QueryInterface(NS_GET_IID(nsIScriptContext),
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(void**)aScriptContext);
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}
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