QmlDesigner: Add StudioQuickWidget

This makes it easy to share the QQmlEngine between different
QQuickWidgets.
All StudioQuickWidgets share the same engine.

Change-Id: I2b370a45a14fdc143e161e2aca62b45aa0d91da9
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

1 files changed, 60 insertions, 0 deletions

diff --git a/src/plugins/qmldesignerbase/utils/studioquickwidget.cpp b/src/plugins/qmldesignerbase/utils/studioquickwidget.cpp
new file mode 100644
index 0000000000..8e19e71a56
--- /dev/null
+++ b/src/plugins/qmldesignerbase/utils/studioquickwidget.cpp
@@ -0,0 +1,60 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#include "studioquickwidget.h"
+
+#include <QVBoxLayout>
+#include <QtQml/QQmlEngine>
+
+QQmlEngine *s_engine = nullptr;
+
+StudioQuickWidget::StudioQuickWidget(QWidget *parent)
+    : QWidget{parent}
+{
+    if (!s_engine)
+        s_engine = new QQmlEngine;
+
+    m_quickWidget = new QQuickWidget(s_engine, this);
+
+    QVBoxLayout *layout = new QVBoxLayout(this);
+    setLayout(layout);
+    layout->setContentsMargins(0, 0, 0, 0);
+    layout->addWidget(m_quickWidget);
+}
+
+QQmlEngine *StudioQuickWidget::engine() const
+{
+    return m_quickWidget->engine();
+}
+
+QQmlContext *StudioQuickWidget::rootContext() const
+{
+    return m_quickWidget->rootContext();
+}
+
+QQuickItem *StudioQuickWidget::rootObject() const
+{
+    return m_quickWidget->rootObject();
+}
+
+void StudioQuickWidget::setResizeMode(QQuickWidget::ResizeMode mode)
+{
+    m_quickWidget->setResizeMode(mode);
+}
+
+void StudioQuickWidget::setSource(const QUrl &url)
+{
+    m_quickWidget->setSource(url);
+}
+
+void StudioQuickWidget::refresh() {}
+
+void StudioQuickWidget::setClearColor(const QColor &color)
+{
+    m_quickWidget->setClearColor(color);
+}
+
+QList<QQmlError> StudioQuickWidget::errors() const
+{
+    return m_quickWidget->errors();
+}