[prev in list] [next in list] [prev in thread] [next in thread] 

List:       calligra-devel
Subject:    Re: Ownership of a widget.
From:       Cyrille Berger Skott <cberger () cberger ! net>
Date:       2013-02-09 20:06:10
Message-ID: 201302092106.10268.cberger () cberger ! net
[Download RAW message or body]

On Saturday 09 Feb 2013, Inge Wallin, Lysator wrote:
> But who should own the widget? Can the docker continue to own the widget
> even  though it physically resides inside the statusbar? somebody must
> control the widget when it moves from one location to the other and I
> don't think it's obvious who that somebody is.

Nope. A QWidget is owned by its parent, and when you have a widget that need 
to be shown inside an other widget, then it has to be owned by that widget. 
From Qt's documentation:

"Top-Level and Child Widgets
A widget without a parent widget is always an independent window (top-level 
widget). For these widgets, setWindowTitle() and setWindowIcon() set the title 
bar and icon respectively.
Non-window widgets are child widgets, displayed within their parent widgets. 
Most widgets in Qt are mainly useful as child widgets. For example, it is 
possible to display a button as a top-level window, but most people prefer to 
put their buttons inside other widgets, such as QDialog.
"

> Does anybody have an idea?  I can give more details but my train leaves now
> so  I need to go now.
Euh yea, have two instance of your widget, one for the docker and one for the 
status bar. Having a widget that "jumps" between parents is a call for 
breakage, maintenance nightmare, bugs and crashes.

-- 
Cyrille Berger Skott
_______________________________________________
calligra-devel mailing list
calligra-devel@kde.org
https://mail.kde.org/mailman/listinfo/calligra-devel
[prev in list] [next in list] [prev in thread] [next in thread]