Merge qtquickcontrols2 into qtdeclarative

Task-number: QTBUG-95173
Change-Id: I2cf31e30127e8cc2f10304cabf4ff7f5050633b8

1 files changed, 167 insertions, 0 deletions

diff --git a/src/quickcontrols2/qtquickcontrols2plugin.cpp b/src/quickcontrols2/qtquickcontrols2plugin.cpp
new file mode 100644
index 0000000000..fcd025e0f4
--- /dev/null
+++ b/src/quickcontrols2/qtquickcontrols2plugin.cpp
@@ -0,0 +1,167 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtCore/qloggingcategory.h>
+#include <QtQml/qqmlengine.h>
+#include <QtQml/qqmlextensionplugin.h>
+#include <QtQuickTemplates2/private/qquicktheme_p_p.h>
+#include <QtQuickControls2/private/qquickstyle_p.h>
+#include <QtQuickControls2/private/qquickstyleplugin_p.h>
+#include <QtQuickControls2/qquickstyle.h>
+#include <QtQuickControls2/qtquickcontrols2global.h>
+
+QT_BEGIN_NAMESPACE
+
+Q_LOGGING_CATEGORY(lcQtQuickControls2Plugin, "qt.quick.controls.qtquickcontrols2plugin")
+
+class QtQuickControls2Plugin : public QQmlExtensionPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
+
+public:
+    QtQuickControls2Plugin(QObject *parent = nullptr);
+    ~QtQuickControls2Plugin();
+
+    void registerTypes(const char *uri) override;
+    void unregisterTypes() override;
+
+private:
+    // We store these because the style plugins can be unregistered before
+    // QtQuickControls2Plugin, and since QQuickStylePlugin calls QQuickStylePrivate::reset(),
+    // the style information can be lost when it comes time to call qmlUnregisterModuleImport().
+    // It also avoids unnecessarily resolving the style after resetting it just to get the style
+    // name in unregisterTypes().
+    bool customStyle = false;
+    QString registeredStyleUri;
+    QString registeredFallbackStyleUri;
+};
+
+static const char *qtQuickControlsUri = "QtQuick.Controls";
+
+QString styleUri()
+{
+    const QString style = QQuickStyle::name();
+    if (!QQuickStylePrivate::isCustomStyle()) {
+        // The style set is a built-in style.
+        const QString styleName = QQuickStylePrivate::effectiveStyleName(style);
+        return QString::fromLatin1("QtQuick.Controls.%1").arg(styleName);
+    }
+
+    // This is a custom style, so just use the name as the import uri.
+    QString styleName = style;
+    if (styleName.startsWith(QLatin1String(":/")))
+        styleName.remove(0, 2);
+    return styleName;
+}
+
+QString fallbackStyleUri()
+{
+    // The fallback style must be a built-in style, so we don't need to check for custom styles here.
+    const QString fallbackStyle = QQuickStylePrivate::fallbackStyle();
+    const QString fallbackStyleName = QQuickStylePrivate::effectiveStyleName(fallbackStyle);
+    return QString::fromLatin1("QtQuick.Controls.%1").arg(fallbackStyleName);
+}
+
+QtQuickControls2Plugin::QtQuickControls2Plugin(QObject *parent) : QQmlExtensionPlugin(parent)
+{
+    volatile auto registration = &qml_register_types_QtQuick_Controls;
+    Q_UNUSED(registration);
+}
+
+QtQuickControls2Plugin::~QtQuickControls2Plugin()
+{
+    // Intentionally empty: we use register/unregisterTypes() to do
+    // initialization and cleanup, as plugins are not unloaded on macOS.
+}
+
+void QtQuickControls2Plugin::registerTypes(const char *uri)
+{
+    qCDebug(lcQtQuickControls2Plugin) << "registerTypes() called with uri" << uri;
+
+    // It's OK that the style is resolved more than once; some accessors like name() cause it to be called, for example.
+    QQuickStylePrivate::init();
+
+    const QString styleName = QQuickStylePrivate::effectiveStyleName(QQuickStyle::name());
+    const QString fallbackStyleName = QQuickStylePrivate::effectiveStyleName(QQuickStylePrivate::fallbackStyle());
+    qCDebug(lcQtQuickControls2Plugin) << "style:" << QQuickStyle::name() << "effective style:" << styleName
+        << "fallback style:" << QQuickStylePrivate::fallbackStyle() << "effective fallback style:" << fallbackStyleName;
+
+    // If the style is Basic, we don't need to register the fallback because the Basic style
+    // provides all controls. Also, if we didn't return early here, we can get an infinite import loop
+    // when the style is set to Basic.
+    if (styleName != fallbackStyleName && styleName != QLatin1String("Basic")) {
+        registeredFallbackStyleUri = ::fallbackStyleUri();
+        qCDebug(lcQtQuickControls2Plugin) << "calling qmlRegisterModuleImport() to register fallback style with"
+            << " uri \"" << qtQuickControlsUri << "\" moduleMajor" << QQmlModuleImportModuleAny
+            << "import" << registeredFallbackStyleUri << "importMajor" << QQmlModuleImportAuto;
+        // The fallback style must be a built-in style, so we match the version number.
+        qmlRegisterModuleImport(qtQuickControlsUri, QQmlModuleImportModuleAny, registeredFallbackStyleUri.toUtf8().constData(),
+            QQmlModuleImportAuto, QQmlModuleImportAuto);
+    }
+
+    // If the user imports QtQuick.Controls 2.15, and they're using the Material style, we should import version 2.15.
+    // However, if they import QtQuick.Controls 2.15, but are using a custom style, we want to use the latest version
+    // number of their style.
+    customStyle = QQuickStylePrivate::isCustomStyle();
+    registeredStyleUri = ::styleUri();
+    const int importMajor = !customStyle ? QQmlModuleImportAuto : QQmlModuleImportLatest;
+    qCDebug(lcQtQuickControls2Plugin).nospace() << "calling qmlRegisterModuleImport() to register primary style with"
+        << " uri \"" << qtQuickControlsUri << "\" moduleMajor " << importMajor
+        << " import " << registeredStyleUri << " importMajor " << importMajor;
+    qmlRegisterModuleImport(qtQuickControlsUri, QQmlModuleImportModuleAny, registeredStyleUri.toUtf8().constData(), importMajor);
+}
+
+void QtQuickControls2Plugin::unregisterTypes()
+{
+    qCDebug(lcQtQuickControls2Plugin) << "unregisterTypes() called";
+
+    if (!registeredFallbackStyleUri.isEmpty()) {
+        // We registered a fallback style, so now we need to unregister it.
+        qmlUnregisterModuleImport(qtQuickControlsUri, QQmlModuleImportModuleAny, registeredFallbackStyleUri.toUtf8().constData(),
+            QQmlModuleImportAuto, QQmlModuleImportAuto);
+        registeredFallbackStyleUri.clear();
+    }
+
+    const int importMajor = !customStyle ? QQmlModuleImportAuto : QQmlModuleImportLatest;
+    qmlUnregisterModuleImport(qtQuickControlsUri, QQmlModuleImportModuleAny, registeredStyleUri.toUtf8().constData(), importMajor);
+    customStyle = false;
+    registeredStyleUri.clear();
+}
+
+QT_END_NAMESPACE
+
+#include "qtquickcontrols2plugin.moc"