Re: QWT plugin for Qt Designer... Won't be promoted to...

[David S. <David_Stranz@MassSpec.com>]

Jia,

 > if (someplot) delete someplot;
 > someplot = new InheritedQwtPlot();

You can probably do this.  I think you need to make sure that the 
replacement plot has the correct parent, so your code should probably be

someplot = new InheritedQwtPlot( this );

You should test this to confirm it.

Regards,

David
_______________________________________________________________
David Stranz, Ph.D.	david_stranz@MassSpec.com

Sierra Analytics, Inc.
5815 Stoddard Road, Suite 601
Modesto, CA  95356

Tel: (209) 545-8508
http://www.massspec.com
_______________________________________________________________



JIA Pei wrote:
> Hi, Sorry for my impoliteness.
> 
> Sorry....
> 
> I just need it to put it into my application.
> 
> I happened to come up with a very very simple idea. I'm wondering if
> that will work?
> 
> Let say, there is a QwtPlot object automatically generated for the .ui .
> for example:
> 
> QwtPlot* someplot = new QwtPlot();
> 
> 
> I can actually do something like this:
> 
> 
> if (someplot) delete someplot;
> someplot = new InheritedQwtPlot();
> 
> 
> In this case, I may obtain the effect the same as "promoted to..." .
> So, can you please confirm this for me?
> 
> 
> Thank you !!
> 
> 
> Best Regards
> JIA
> 
> 
> 
> On Fri, Oct 30, 2009 at 2:27 AM, David Stranz <Dav...@ma...> wrote:
>> Jia,
>>
>> If you are prepared to edit the Qt Designer .ui file (XML) file
>> yourself, you can do this promotion by adding a QwtPlot, then editing
>> the XML to change it to your derived class.  You must provide all the
>> information the UI compiler needs to generate the MOC files, but it
>> isn't that hard to do.
>>
>> Try adding a different (Qt) widget, then promoting that so you can see
>> what new code gets added to the XML.
>>
>>  > So, will QWT release an updated version ASAP to recover this drawback?
>>
>> Keep in mind that "QWT" is "Uwe", and he has a lot of things to do.  Qwt
>> is just his side project, and he doesn't get paid to do it.  Demanding
>> that he do something "ASAP" just for you isn't very polite, is it?
>>
>> Best regards,
>>
>> David
>> _______________________________________________________________
>> David Stranz, Ph.D.     david_stranz@MassSpec.com
>>
>> Sierra Analytics, Inc.
>> 5815 Stoddard Road, Suite 601
>> Modesto, CA  95356
>>
>> Tel: (209) 545-8508
>> http://www.massspec.com
>> _______________________________________________________________
>>
>>
>>
>> JIA Pei wrote:
>>> Hi, I think this is a very serious user requirement for QWT.
>>>
>>> Please refer to
>>> http://www.qtcentre.org/forum/f-qwt-23/t-qwtplot-promote-to-custom-widget-6669.html
>>>
>>> I would like to use my self-defined class extended from "QwtPlot",
>>> something like
>>>
>>> class CDataPlot : public QwtPlot
>>> {
>>> }
>>>
>>> However, QT Designer seems not permit me to promote QwtPlot to my own
>>> class because there is nothing relative to QWT
>>> shown in the New Promoted Class list.
>>>
>>> So, will QWT release an updated version ASAP to recover this drawback?
>>>
>>> Best Regards
>>> JIA
>>>
>>
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> 
> 
>