[Qt-interest] Promoting custom widgets in designer

[K. Frank]

Tony -

(Sorry not to be of help.  I'm just chiming in with a "me too.")

On Fri, May 14, 2010 at 12:10 AM, Tony Rietwyk
<tony.rietwyk at rightsoft.com.au> wrote:
> Hi Everybody,
>
> I have created a custom widget and plugin and designer loads it.  I have successfully created various ui files using the custom widget, and they work OK when the application runs.

I don't have any designer-integrated custom widgets that I have written myself,
but I am using Qwt (a set of technical plotting widgets), and they are packaged
as a designer plugin and seem to work properly with designer.

> In one particular case, I need to override a virtual method in the custom widget.  I was surprised to find that right-clicking a custom widget does not show the "promote to ..." menu item.  It does have a "promoted widgets..." item, but the combo in the New Promoted Class section only has Qt widgets, and I cannot enter the name of my custom widget as base class.

I see what you mean -- I hadn't noticed this before.  I tried a test
-- I created a
fresh QWidget-based designer form and dropped both a QTextEdit and QwtPlot
onto it.

Just as you say, right-clicking on the QTextEdit brings up "Promote to ..." as a
menu item, while right-clicking on the QwtPlot brings up instead the "Promoted
widgets..."  menu item, and, indeed, the "Base class name:" combo of the
"Promoted Widgets" dialog lists only Qt widgets, and none of the Qwt widgets.

> ...
> Have I missed something?  Are there any plans to fix this?  Should I raise a bug?

I see exactly what you are describing.  Is there is some additional
way to integrate
custom widgets into designer that makes available the promotion functionality?
I have no idea one way or the other.  (It looks to me more like a
design limitation
than an outright bug, but maybe it is supposed to work.)

(I'm using Qt Designer 4.6.1.)

>
> Thanks,
> Tony.

Good luck.

K. Frank