Use QML_ELEMENT macro instead of qmlRegister* for mediaplayer

Updated the MediaPlayer example to use compile-time QML registration via
the QML_ELEMENT macros instead of qmlRegisterSingletonType. This aligns
the example with modern Qt 6 best practices and improves startup
performance and tooling integration.

Pick-to: 6.9 6.8
Task-number: QTBUG-136712
Change-Id: Id34670f4d45200b9a1424612f5a05bebead0a60e
Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com>

examples/demos/mediaplayer/CMakeLists.txt

@@ -13,6 +13,11 @@ qt_add_executable(MediaPlayerApp
     filenameprovider.h
 )
 
+qt_add_qml_module(MediaPlayerApp
+    URI "io.qt.filenameprovider"
+    VERSION 1.0
+)
+
 qt_add_ios_ffmpeg_libraries(MediaPlayerApp)
 
 add_subdirectory(MediaPlayer)

examples/demos/mediaplayer/MediaPlayer/PlaylistInfo.qml

@@ -10,7 +10,6 @@ import QtQuick.Layouts
 import QtCore
 import MediaControls
 import Config
-
 import io.qt.filenameprovider
 
 Rectangle {

examples/demos/mediaplayer/filenameprovider.h

@@ -6,11 +6,15 @@
 
 #include <QObject>
 #include <QFileInfo>
+#include <qqmlregistration.h>
 
 // Helper class to retrieve the filename from the given path using QFileInfo
 class FileNameProvider: public QObject
 {
     Q_OBJECT
+    QML_ELEMENT
+    QML_SINGLETON
+
 public:
     explicit FileNameProvider(QObject* parent = nullptr): QObject(parent) {}
     Q_INVOKABLE static QString getFileName(const QString &p) { return QFileInfo(p).fileName(); }

examples/demos/mediaplayer/main.cpp

@@ -7,9 +7,6 @@
 #include <QDir>
 #include <QMediaFormat>
 #include <QMimeType>
-
-#include "filenameprovider.h"
-
 #include <algorithm>
 
 using namespace Qt::Literals::StringLiterals;
@@ -52,13 +49,6 @@ int main(int argc, char *argv[])
 {
     QGuiApplication app(argc, argv);
 
-    qmlRegisterSingletonType<FileNameProvider>("io.qt.filenameprovider", 1, 0, "FileNameProvider",
-        [] (QQmlEngine *engine, QJSEngine *scriptEngine) -> QObject * {
-            static auto * provider = new FileNameProvider();
-            return provider;
-        }
-    );
-
     QCoreApplication::setApplicationName("MediaPlayer Example");
     QCoreApplication::setOrganizationName("QtProject");
     QCoreApplication::setApplicationVersion(QT_VERSION_STR);