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

[Jack Wootton]

On Mon, Jul 6, 2009 at 3:43 PM, 胡 波<h3282129 at yahoo.com.cn> wrote:
> Thank you for your answer!
>
> I think that our idea may be different.I want to extend subobject "widget"
> to "window"object in webkit .because I want to add some application to
> widget object,and make it inherited from the window object.
>
> can you help me ?   thank you!!


Sorry, I wasn't aware WebKit had a widget property of the window object.

If you are asking how do you extend the widget object that already
belongs to the window object then you need to:

1. Retrieve a reference to the window object, I think you may need to
use KJS::Window::retrieveWindow
2. Convert the object retrieved in step 1 (KJS::Window object) to a
JSObjectRef using JSObjectRef winRef = toRef(window);
3. Use the JavaScriptCore function JSObjectGetProperty on the window
object to retrieve the widget JSObjectRef object.
4. Once you have the widget JSObjectRef, then I assume you can add new
methods or properties to it.

Maybe someone else who knows more about this, or understands your
request better, may be able to help you.

> --- 09年7月6日，周一, 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6日,周一,下午5:22
>
> 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?
>>>> ________________________________
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>>>> 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
>
> ________________________________
> 好玩贺卡等你发，邮箱贺卡全新上线！



-- 
Regards
Jack