зеркало из https://github.com/mozilla/pjs.git
156 строки
4.2 KiB
C++
156 строки
4.2 KiB
C++
/* vim: se cin sw=2 ts=2 et : */
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All 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 terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef __mozilla_widget_GfxInfoCollector_h__
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#define __mozilla_widget_GfxInfoCollector_h__
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#include "jsapi.h"
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namespace mozilla {
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namespace widget {
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/* this is handy wrapper around JSAPI to make it more pleasant to use.
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* We collect the JSAPI errors and so that callers don't need to */
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class InfoObject
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{
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friend class GfxInfoBase;
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public:
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void DefineProperty(const char *name, int value)
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{
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if (!mOk)
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return;
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mOk = JS_DefineProperty(mCx, mObj, name, INT_TO_JSVAL(value), NULL, NULL, JSPROP_ENUMERATE);
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}
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void DefineProperty(const char *name, nsAString &value)
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{
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if (!mOk)
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return;
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const nsString &flat = PromiseFlatString(value);
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JSString *string = JS_NewUCStringCopyN(mCx, static_cast<const jschar*>(flat.get()), flat.Length());
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if (!string)
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mOk = JS_FALSE;
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if (!mOk)
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return;
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mOk = JS_DefineProperty(mCx, mObj, name, STRING_TO_JSVAL(string), NULL, NULL, JSPROP_ENUMERATE);
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}
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void DefineProperty(const char *name, const char *value)
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{
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nsAutoString string = NS_ConvertASCIItoUTF16(value);
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DefineProperty(name, string);
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}
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private:
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// We need to ensure that this object lives on the stack so that GC sees it properly
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InfoObject(JSContext *aCx) : mCx(aCx), mOk(JS_TRUE)
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{
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mObj = JS_NewObject(mCx, NULL, NULL, NULL);
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if (!mObj)
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mOk = JS_FALSE;
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}
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InfoObject(InfoObject&);
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JSContext *mCx;
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JSObject *mObj;
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JSBool mOk;
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};
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/*
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Here's an example usage:
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class Foo {
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Foo::Foo() : mInfoCollector(this, &Foo::GetAweseomeness) {}
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void GetAwesomeness(InfoObject &obj) {
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obj.DefineProperty("awesome", mAwesome);
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}
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int mAwesome;
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GfxInfoCollector<Foo> mInfoCollector;
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}
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This will define a property on the object
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returned from calling getInfo() on a
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GfxInfo object. e.g.
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gfxInfo = Cc["@mozilla.org/gfx/info;1"].getService(Ci.nsIGfxInfo);
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info = gfxInfo.getInfo();
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if (info.awesome)
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alert(info.awesome);
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*/
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class GfxInfoCollectorBase
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{
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public:
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GfxInfoCollectorBase();
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virtual void GetInfo(InfoObject &obj) = 0;
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virtual ~GfxInfoCollectorBase();
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};
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template<class T>
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class GfxInfoCollector : public GfxInfoCollectorBase
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{
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public:
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GfxInfoCollector(T* aPointer, void (T::*aFunc)(InfoObject &obj)) : mPointer(aPointer), mFunc(aFunc) {
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}
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virtual void GetInfo(InfoObject &obj) {
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(mPointer->*mFunc)(obj);
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}
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protected:
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T* mPointer;
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void (T::*mFunc)(InfoObject &obj);
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};
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}
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}
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#endif
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