[Interest] Qt5: Obtain current layout size

Bo Thorsen bo at fioniasoftware.dk
Mon Jul 23 10:52:52 CEST 2012

Den 22-07-2012 21:49, Stephen Chu skrev:
> On 7/22/12 6:30 AM, Bo Thorsen wrote:
>> Den 21-07-2012 18:27, Stephen Chu skrev:
>>> I am working on a dynamically generated form. One thing I'd like to do
>>> is to reflow the layout into multi-column when the widgets fill the
>>> preset window height.
>>> I need to find out what the current layout height is before I add the
>>> new widget. The problem is, layout geometry is always 0x0 before the
>>> window is shown. And if I show the window before adding the widgets, not
>>> only does the window flickers badly, it also doesn't auto-position
>>> correctly. What's worse, the geometry reported is still 0x0.
>>> So how do I get the correct layout or parent widget size before showing
>>> the widget/window? Thanks.
>> You can't use size or geometry because they are properties of what is
>> actually shown.
>> For your case, you should use the minimum sizes instead. Those should be
>> available to you.
> Thanks. That works. Do you happen to know how I can get the size of a
> window maximized without first maximize it?

You can't do that.

The real fix for what you are trying to do here is to write your own 
layout manager class. You should subclass QLayout and implement the 
layouting yourself. It's the only way (I think) that truly does what you 
want to achieve without using a bunch of bad hacks along the way.

Bo Thorsen,
Fionia Software.


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