1 files changed, 139 insertions, 0 deletions
diff --git a/src/quicknativestyle/qtquickcontrols2nativestyleplugin.cpp b/src/quicknativestyle/qtquickcontrols2nativestyleplugin.cpp
new file mode 100644
index 0000000000..f1ff18c74f
--- /dev/null
+++ b/src/quicknativestyle/qtquickcontrols2nativestyleplugin.cpp
@@ -0,0 +1,139 @@
+// Copyright (C) 2020 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include <QtQml/qqml.h>
+#include <QtQuickControls2/private/qquickstyleplugin_p.h>
+#include <QtGui/qguiapplication.h>
+#include <QtGui/qpa/qplatformintegration.h>
+#include <QtGui/private/qguiapplication_p.h>
+#include <QtGui/qstylehints.h>
+#include <QtQuickTemplates2/private/qquicktheme_p.h>
+
+#include "qquicknativestyle.h"
+#include "qquickcommonstyle.h"
+
+#if defined(Q_OS_MACOS)
+#include "qquickmacfocusframe.h"
+#include "qquickmacstyle_mac_p.h"
+#elif defined(Q_OS_WINDOWS)
+#include "qquickwindowsfocusframe.h"
+#include "qquickwindowsxpstyle_p.h"
+#endif
+
+QT_BEGIN_NAMESPACE
+
+extern void qml_register_types_QtQuick_NativeStyle();
+Q_GHS_KEEP_REFERENCE(qml_register_types_QtQuick_NativeStyle);
+
+using namespace QQC2;
+
+class QtQuickControls2NativeStylePlugin : public QQuickStylePlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
+
+public:
+    QtQuickControls2NativeStylePlugin(QObject *parent = nullptr);
+    ~QtQuickControls2NativeStylePlugin() override;
+
+    void initializeEngine(QQmlEngine *engine, const char *uri) override;
+    void initializeTheme(QQuickTheme *theme) override;
+    QString name() const override;
+
+#if defined(Q_OS_MACOS) || defined (Q_OS_WIN)
+    QScopedPointer<QQuickFocusFrame> m_focusFrame;
+#endif
+};
+
+static void deleteQStyle()
+{
+    // When we delete QStyle, it will free up it's own internal resources. Especially
+    // on macOS, this means releasing a lot of NSViews and NSCells from the QMacStyle
+    // destructor. If we did this from ~QtQuickControls2NativeStylePlugin, it would
+    // happen when the plugin was unloaded from a Q_DESTRUCTOR_FUNCTION in QLibrary,
+    // which is very late in the tear-down process, and after qGuiApp has been set to
+    // nullptr, NSApplication has stopped running, and perhaps also other static platform
+    // variables (e.g in AppKit?) has been deleted. And to our best guess, this is also why
+    // we see a crash in AppKit from the destructor in QMacStyle. So for this reason, we
+    // delete QStyle from a post routine rather than from the destructor.
+    QQuickNativeStyle::setStyle(nullptr);
+}
+
+QtQuickControls2NativeStylePlugin::QtQuickControls2NativeStylePlugin(QObject *parent):
+    QQuickStylePlugin(parent)
+{
+    volatile auto registration = &qml_register_types_QtQuick_NativeStyle;
+    Q_UNUSED(registration);
+}
+
+QtQuickControls2NativeStylePlugin::~QtQuickControls2NativeStylePlugin()
+{
+    if (!qGuiApp)
+        return;
+
+    // QGuiApplication is still running, so we need to remove the post
+    // routine to not be called after we have been unloaded.
+    qRemovePostRoutine(deleteQStyle);
+    QQuickNativeStyle::setStyle(nullptr);
+}
+
+QString QtQuickControls2NativeStylePlugin::name() const
+{
+    return QStringLiteral("NativeStyle");
+}
+
+void QtQuickControls2NativeStylePlugin::initializeEngine(QQmlEngine *engine, const char *uri)
+{
+    Q_UNUSED(engine);
+    Q_UNUSED(uri);
+    // Enable commonstyle as a reference style while
+    // the native styles are under development.
+    QStyle *style = nullptr;
+    if (qEnvironmentVariable("QQC2_COMMONSTYLE") == QStringLiteral("true")) {
+        style = new QCommonStyle;
+    } else {
+        const QString envStyle = qEnvironmentVariable("QQC2_STYLE");
+        if (!envStyle.isNull()) {
+            if (envStyle == QLatin1String("common"))
+                style = new QCommonStyle;
+#if defined(Q_OS_MACOS)
+            else if (envStyle == QLatin1String("mac"))
+                style = new QMacStyle;
+#endif
+#if defined(Q_OS_WINDOWS)
+            else if (envStyle == QLatin1String("windows"))
+                style = new QWindowsStyle;
+            else if (envStyle == QLatin1String("windowsxp"))
+                style = new QWindowsXPStyle;
+#endif
+        }
+        if (!style) {
+#if defined(Q_OS_MACOS)
+            style = new QMacStyle;
+#elif defined(Q_OS_WINDOWS)
+            style = new QWindowsXPStyle;
+            if (QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark)
+                qobject_cast<QWindowsStyle *>(style)->refreshPalette();
+#else
+            style = new QCommonStyle;
+#endif
+        }
+    }
+
+#if defined(Q_OS_MACOS)
+    m_focusFrame.reset(new QQuickMacFocusFrame());
+#elif defined(Q_OS_WIN)
+    m_focusFrame.reset(new QQuickWindowsFocusFrame());
+#endif
+
+    qAddPostRoutine(deleteQStyle);
+    QQuickNativeStyle::setStyle(style);
+}
+
+void QtQuickControls2NativeStylePlugin::initializeTheme(QQuickTheme * /*theme*/)
+{
+}
+
+QT_END_NAMESPACE
+
+#include "qtquickcontrols2nativestyleplugin.moc"