[webkit-dev] how to extend the javascript native object?

[Jack Wootton]

On Sat, Jul 4, 2009 at 4:52 PM, 胡 波<h3282129 at yahoo.com.cn> wrote:
> Thank you very much!
>
> I understand your steps,But I do not understand the implement process! In
> the samples you provide with me , I do not find the .cpp file. I want to get
> a sample for windows.Can you help me?
>
> my aim:"widget" object is the same the "history" object,for
> example,to:"widget" object: window.widget.(property/method),:to :"history"
> object,window.history.back();
>
> thank you!
>

In the JSPong example I linked, the first thing to look at should
probably be PongAI.js.  Since this gives you an idea of what is being
achieved. Then read the ReadMe.txt to get an overview of the different
classes involved. You could then have a look at JSShape.m is where the
"ball" class is constructed and it's properties are associated with
Objective C implementation (by adding static values to the class
definition).

There is one oddity though, I do not understand why NSObject is
inherited from, since I thought use of the JavaScriptCore API meant
that developers didn't have to inherit from classes in this
manner...that the API did this for them.  Maybe someone on this
mailing list can help clarify this?




> --- 09年7月4日，周六, Jack Wootton <jackwootton at gmail.com> 写道：
>
> 发件人: Jack Wootton jackwootton at gmail.com
> 主题: Re: [webkit-dev] how to extend the javascript native object?
> 收件人: "胡 波" <h3282129 at yahoo.com.cn>
> 抄送: webkit-dev at lists.webkit.org
> 日期: 2009年7月4日,周六,上午12:26
>
> To add, it maybe useful to look at the following files in the
> JavaScriptCore (Although, personally I didn't find them particularly
> easy to understand.)
>
> JavaScriptCore\API\testapi.c
> testapi.js
>
>
> There are also some example programs that do what you want to do, only
> with different objects.
>
> JSPong: http://developer.apple.com/SampleCode/JSPong/index.html
>
> JSInterpreter:
> http://developer.apple.com/samplecode/JSInterpreter/index.html
>
> More programs can be found here:
>
> http://developer.apple.com/SampleCode/Cocoa/idxInternetWeb-date.html
>
>
>
> 2009/7/3 Jack Wootton <jackwootton at gmail.com>:
>> Are you saying you wan to add a 'widget' property to the Window
>> object?  If so, then the JavaScriptCore API has methods that will
>> help you:
>>
>> Here is the API:
>>
>>
>> http://gemma.apple.com/documentation/Carbon/Reference/WebKit_JavaScriptCore_Ref/index.html#//apple_ref/doc/framework/javascriptcore_fw
>>
>> If this is what you wish to do, then the following is a rough guide of
>> what you need to do:
>>
>> 1. Create an empty class definition, you can create an empty class
>> definition using kJSClassDefinitionEmpty.
>> 2. Use the class definition with the JSCoreAPI method "JSClassCreate"
>> to create your class.
>> 3. Use your new class with JSObjectMake to create your new JSObject
>> (this will be your widget object).
>> 4  Use JSObjectSetProperty to add your new JSObject as a property of
>> the Window object.
>>
>>
>> On Fri, Jul 3, 2009 at 4:51 PM, 胡 波<h3282129 at yahoo.com.cn> wrote:
>>>     I want to extend the javascript native object,such as widget
>>> object,and
>>> make it inherit window object. That is to say,when the widget object is
>>> extended, and we can use it by the window.widget.(method/property) in the
>>> html document?
>>> ________________________________
>>> 好玩贺卡等你发，邮箱贺卡全新上线！
>>> _______________________________________________
>>> webkit-dev mailing list
>>> webkit-dev at lists.webkit.org
>>> http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
>>>
>>>
>>
>>
>>
>> --
>> Regards
>> Jack
>>
>
>
>
> --
> Regards
> Jack
>
> ________________________________
> 好玩贺卡等你发，邮箱贺卡全新上线！



-- 
Regards
Jack