[Interest] QWindows and objectNames
Thiago Macieira
thiago.macieira at intel.com
Fri Sep 24 19:50:15 CEST 2021
On Friday, 24 September 2021 06:27:31 PDT Tor Arne Vestbø wrote:
> That’s expected. The name of your widget is “myMainWindow”. The name of the
> QWindow (QWidgetWindow) backing that QWidget has the widget name with a
> “Window” suffix.
>
> Renaming your widget to “myMainWindowWidget” will make it clearer :)
Resulting in a name of "myMainWindowWidgetWindow" ? :)
Yves: you're confusing QWindows and QWidgets. For historical reasons,
QMainWindow is a widget, not a window. It's a very old class, dating back to
the very early 1990s, when Qt didn't have a distinction between widgets and
windows. Until 5.0, the a (top-level) window simply was any widget that had no
parent widget. That's why some API in QtWidgets has "Window" in the name, such
as QMainWindow and QApplication::activeWindow().
When Qt 5.0 split the widget content from QtGui into QtWidgets, it added
QWindow, which is always a windowing system window, but carries no widget
baggage. All QWidgets that have no parent (and some that do) are also
associated with a QWindow. That's where the "Window" suffix gets added.
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel DPG Cloud Engineering
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