[Interest] Widget cross-platform (minimum) size constraint problem.

[Goblin Coding]

Hi Tony,

You make a valid point.  Originally the idea was to allow for scrollbars,
but since that comes with an entirely different set of issues (as soon as
the scrollbar appears, it "cramps the style" of the remaining
widgets...i.e. when the horizontal scrollbar is created, it actually uses
some of the available vertical space and overlaps some of the widgets in
the scroll area...I hope that makes sense).

I'll try using a standard QWidget as parent (as opposed to the QScrollArea)
and see how that pans out.

I also realise that there are no guarantees regarding the look of the Qt
widgets on different platforms.  What I actually wanted to find out is if
there was a way to design a widget in Qt Designer so that the way it looks
in Designer will be the way it is created at run-time? (i.e. if I tweak it
on Windows and run it on Windows, it should look fine on Windows...if I
subsequently go tweak it on Linux and run it on Linux, it should look fine
on Linux).  My problem is that, so far, it seems setting min values is a
hit and miss operation - tweak value, compile, run, see what it looks like,
realise it's too big/small, tweak value, compile, etc etc.

Thanks for the input!
William




On Wed, Jan 2, 2013 at 9:13 AM, Tony Rietwyk <tony at rightsoft.com.au> wrote:

> Hi, ****
>
> ** **
>
> The short answer is NO - Qt does not guarantee that designer created
> layouts look identical on all platforms.   Especially on Mac where the
> minimum sizes are much larger due to the larger default font size and
> layout margins.   The same widget type will have different default minimum
> sizes depending on the platform and desktop style.  ****
>
> ** **
>
> It's not clear to me why you have put the groups in a scroll area, if you
> don't want scroll bars to be shown.   If you drag the layout into a normal
> dialog or main window, then the minimum sizes that you have set should be
> respected, and the group boxes should grow if you have allowed that.  ****
>
> ** **
>
> Tony.****
>
> ** **
>
> ** **
>
> ** **
>
> *From:* interest-bounces+tony=rightsoft.com.au at qt-project.org [mailto:
> interest-bounces+tony=rightsoft.com.au at qt-project.org] *On Behalf Of *Goblin
> Coding
> *Sent:* Wednesday, 2 January 2013 5:13 PM
> *To:* interest at qt-project.org
> *Subject:* [Interest] Widget cross-platform (minimum) size constraint
> problem.****
>
> ** **
>
> Hi All,****
>
> First of all, I have had a look at the documentation, I’ve tried various
> combinations of setting minimum sizes, different size policies, calling
> updateGeometry() and adjustSize(), I’ve searched the forum for “qwidget
> minimum size” and others, I’ve asked Google…and I’m still stuck.****
>
> *Background*
> I have a widget deriving from QScrollArea. This widget is populated with a
> bunch of QGroupBox’es in a horizontal layout (the main layout for the
> widget). Each QGroupBox contains buttons and/or other standard Qt widgets
> and all of them have layouts assigned to them and their content.****
>
> *The problem*
> On Windows, I manage to ensure that the widget is created with the minimum
> size required to display the content WITHOUT having to show any scroll bars
> by setting the minimumSize property (using QtCreator and designer) and
> setting both the horizontal and vertical size policies to “Fixed”. This
> works just fine. ****
>
> However, compiling the same code on Ubuntu (12.04 LTS), the widget is
> displayed with the horizontal scroll bar showing at start-up. Now, I can
> obviously sort that out (for Ubuntu) by playing around with the minimum
> size settings, but that kind of defeats the point of “code once, deploy
> everywhere”.****
>
> *The question*
> Is there a way to ensure that what I see in designer is what I get? In
> case this is not clear: is there a way to ensure that the widget, when set
> on a parent widget or window, will look *exactly* like it does when
> viewed in designer?****
>
> *Qt details:*****
>
> QtCreator 2.4.1 based on Qt 4.7.4 (32 bit) ****
>
> Thanks for your help!****
>
> ** **
>
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>
>
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