qt 6.5.1 original

examples/widgets/tools/styleplugin/plugin/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#! [0]
+qt_add_plugin(simplestyleplugin
+    CLASS_NAME SimpleStylePlugin
+    simplestyle.cpp simplestyle.h
+    simplestyleplugin.cpp simplestyleplugin.h
+)
+#! [0]
+
+if(QT_FEATURE_debug AND APPLE)
+    set_property(TARGET simplestyleplugin
+       APPEND_STRING PROPERTY OUTPUT_NAME "_debug")
+endif()
+
+get_target_property(is_bundle styleplugin MACOSX_BUNDLE)
+if(APPLE AND is_bundle)
+#! [1]
+    set_target_properties(simplestyleplugin PROPERTIES
+        LIBRARY_OUTPUT_DIRECTORY "$<TARGET_BUNDLE_CONTENT_DIR:styleplugin>/PlugIns/styles"
+    )
+#! [1]
+else()
+#! [2]
+    set_target_properties(simplestyleplugin PROPERTIES
+        LIBRARY_OUTPUT_DIRECTORY "$<TARGET_FILE_DIR:styleplugin>/styles"
+    )
+#! [2]
+endif()
+
+target_link_libraries(simplestyleplugin PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+install(TARGETS simplestyleplugin
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/tools/styleplugin/plugin/plugin.pro

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+#! [0]
+TEMPLATE    = lib
+CONFIG     += plugin
+QT         += widgets
+HEADERS     = simplestyle.h \
+              simplestyleplugin.h
+SOURCES     = simplestyle.cpp \
+              simplestyleplugin.cpp
+TARGET      = simplestyleplugin
+#! [0]
+win32 {
+    CONFIG(debug, release|debug):DESTDIR = ../debug/styles/
+    CONFIG(release, release|debug):DESTDIR = ../release/styles/
+} else {
+    macos {
+        # The non-app-bundle case is not supported with qmake, because
+        # the plugin project cannot know whether the app is built
+        # as a bundle or not.
+        DESTDIR = ../styleplugin.app/Contents/PlugIns/styles/
+        contains(QT_CONFIG, debug) {
+            TARGET = $$join(TARGET,,,_debug)
+        }
+    } else {
+        DESTDIR = ../styles/
+    }
+}
+
+EXAMPLE_FILES += simplestyle.json
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/tools/styleplugin/styles
+INSTALLS += target
+
+CONFIG += install_ok  # Do not cargo-cult this!

examples/widgets/tools/styleplugin/plugin/simplestyle.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "simplestyle.h"
+
+void SimpleStyle::polish(QPalette &palette)
+{
+    palette.setBrush(QPalette::Text, Qt::red);
+}

examples/widgets/tools/styleplugin/plugin/simplestyle.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef SIMPLESTYLE_H
+#define SIMPLESTYLE_H
+
+#include <QProxyStyle>
+
+class SimpleStyle : public QProxyStyle
+{
+    Q_OBJECT
+
+public:
+    SimpleStyle() = default;
+
+    void polish(QPalette &palette) override;
+};
+
+#endif

examples/widgets/tools/styleplugin/plugin/simplestyle.json

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+{
+    "Keys": [ "simplestyle" ]
+}

examples/widgets/tools/styleplugin/plugin/simplestyleplugin.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "simplestyleplugin.h"
+#include "simplestyle.h"
+
+//! [0]
+QStringList SimpleStylePlugin::keys() const
+{
+    return {"SimpleStyle"};
+}
+//! [0]
+
+//! [1]
+QStyle *SimpleStylePlugin::create(const QString &key)
+{
+    if (key.toLower() == "simplestyle")
+        return new SimpleStyle;
+    return nullptr;
+}
+//! [1]

examples/widgets/tools/styleplugin/plugin/simplestyleplugin.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef SIMPLESTYLEPLUGIN_H
+#define SIMPLESTYLEPLUGIN_H
+
+#include <QStylePlugin>
+
+//! [0]
+class SimpleStylePlugin : public QStylePlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QStyleFactoryInterface" FILE "simplestyle.json")
+
+public:
+    SimpleStylePlugin() = default;
+
+    QStringList keys() const;
+    QStyle *create(const QString &key) override;
+};
+//! [0]
+
+#endif