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QGuiApplication: Report default platform name before initialization

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Calling this function before we had a QGuiApplication instance, would
return an empty string, even if QT_QPA_DEFAULT_PLATFORM_NAME was defined
at compile time. We now return the default platform name

[ChangeLog][QtGui][QGuiApplication] QGuiApplication::platformName
now reports the default platform name if QGuiApplication hasn't been
instantiated yet. It used to return an empty string.

Change-Id: Iffe7cde8943ed2d186bc494d0920b9cf79389dd0
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit dd3840a1a201318c8f089dc7d34ec38f64e05b4e)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Pasi Petäjäjärvi 2023-08-23 10:42:51 +03:00 committed by Qt Cherry-pick Bot
parent eb1d0f5d05
commit bcbbafca88
1 changed files with 14 additions and 2 deletions
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16
src/gui/kernel/qguiapplication.cpp
View File

@ -1194,14 +1194,26 @@ QWindow *QGuiApplication::topLevelAt(const QPoint &pos)
\li \c xcb is a plugin for the X11 window system, used on some desktop Linux platforms.
\endlist
\note Calling this function without a QGuiApplication will return the default
platform name, if available. The default platform name is not affected by the
\c{-platform} command line option, or the \c QT_QPA_PLATFORM environment variable.
For more information about the platform plugins for embedded Linux devices,
see \l{Qt for Embedded Linux}.
*/
QString QGuiApplication::platformName()
{
return QGuiApplicationPrivate::platform_name ?
*QGuiApplicationPrivate::platform_name : QString();
if (!QGuiApplication::instance()) {
#ifdef QT_QPA_DEFAULT_PLATFORM_NAME
return QStringLiteral(QT_QPA_DEFAULT_PLATFORM_NAME);
#else
return QString();
#endif
} else {
return QGuiApplicationPrivate::platform_name ?
*QGuiApplicationPrivate::platform_name : QString();
}
}
Q_LOGGING_CATEGORY(lcQpaPluginLoading, "qt.qpa.plugin");