Move Qt Quick Widgets example and document it

Because QtQuickWidgets is part of Qt Quick module documentation,
its examples need to also be moved under the examples/quick
directory structure.

This change moves the example, creates minimal documentation
for it, and adds a link to it from the QQuickWidget class
reference.

Task-number: QTBUG-37272
Change-Id: Iffb67849f150b9aaf0edaef5852364e93f7752b8
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

8 files changed, 221 insertions, 0 deletions

diff --git a/examples/quick/quickwidgets/quickwidget/doc/images/qtquickwidgets-example.png b/examples/quick/quickwidgets/quickwidget/doc/images/qtquickwidgets-example.png
new file mode 100644
index 0000000000..cc4f52082f
--- /dev/null
+++ b/examples/quick/quickwidgets/quickwidget/doc/images/qtquickwidgets-example.png
diff --git a/examples/quick/quickwidgets/quickwidget/doc/src/quickwidget.qdoc b/examples/quick/quickwidgets/quickwidget/doc/src/quickwidget.qdoc
new file mode 100644
index 0000000000..8a89371039
--- /dev/null
+++ b/examples/quick/quickwidgets/quickwidget/doc/src/quickwidget.qdoc
@@ -0,0 +1,34 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file.  Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: http://www.gnu.org/copyleft/fdl.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \title Qt Quick Widgets Example
+    \example quickwidgets/quickwidget
+    \brief Demonstrates how to mix QML with a Qt Widgets application using the QQuickWidget class.
+    \image qtquickwidgets-example.png
+*/
+
diff --git a/examples/quick/quickwidgets/quickwidget/main.cpp b/examples/quick/quickwidgets/quickwidget/main.cpp
new file mode 100644
index 0000000000..c1304347ec
--- /dev/null
+++ b/examples/quick/quickwidgets/quickwidget/main.cpp
@@ -0,0 +1,112 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
+**     of its contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QQuickWidget>
+#include <QQmlError>
+#include <QtWidgets>
+
+class MainWindow : public QMainWindow {
+    Q_OBJECT
+public:
+    MainWindow();
+
+private slots:
+    void quickWidgetStatusChanged(QQuickWidget::Status);
+    void sceneGraphError(QQuickWindow::SceneGraphError error, const QString &message);
+
+private:
+    QQuickWidget *m_quickWidget;
+};
+
+MainWindow::MainWindow()
+   : m_quickWidget(new QQuickWidget)
+{
+    QMdiArea *centralWidget = new QMdiArea;
+
+    QLCDNumber *lcd = new QLCDNumber;
+    lcd->display(1337);
+    lcd->setMinimumSize(250,100);
+    centralWidget ->addSubWindow(lcd);
+
+    QUrl source("qrc:quickwidget/rotatingsquare.qml");
+
+    connect(m_quickWidget, SIGNAL(statusChanged(QQuickWidget::Status)),
+            this, SLOT(quickWidgetStatusChanged(QQuickWidget::Status)));
+    connect(m_quickWidget, SIGNAL(sceneGraphError(QQuickWindow::SceneGraphError,QString)),
+            this, SLOT(sceneGraphError(QQuickWindow::SceneGraphError,QString)));
+    m_quickWidget->resize(300,300);
+    m_quickWidget->setResizeMode(QQuickWidget::SizeRootObjectToView );
+    m_quickWidget->setSource(source);
+
+    centralWidget ->addSubWindow(m_quickWidget);
+
+    setCentralWidget(centralWidget);
+
+    QMenu *fileMenu = menuBar()->addMenu(tr("File"));
+    QAction *quitAction = fileMenu->addAction(tr("Quit"));
+    connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
+}
+
+void MainWindow::quickWidgetStatusChanged(QQuickWidget::Status status)
+{
+    if (status == QQuickWidget::Error) {
+        QStringList errors;
+        foreach (const QQmlError &error, m_quickWidget->errors())
+            errors.append(error.toString());
+        statusBar()->showMessage(errors.join(QStringLiteral(", ")));
+    }
+}
+
+void MainWindow::sceneGraphError(QQuickWindow::SceneGraphError, const QString &message)
+{
+     statusBar()->showMessage(message);
+}
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+
+    MainWindow mainWindow;
+    mainWindow.show();
+
+    return app.exec();
+}
+
+#include "main.moc"
diff --git a/examples/quick/quickwidgets/quickwidget/qtquickwidgets-example.png b/examples/quick/quickwidgets/quickwidget/qtquickwidgets-example.png
new file mode 100644
index 0000000000..cc4f52082f
--- /dev/null
+++ b/examples/quick/quickwidgets/quickwidget/qtquickwidgets-example.png
diff --git a/examples/quick/quickwidgets/quickwidget/quickwidget.pro b/examples/quick/quickwidgets/quickwidget/quickwidget.pro
new file mode 100644
index 0000000000..1aca22082e
--- /dev/null
+++ b/examples/quick/quickwidgets/quickwidget/quickwidget.pro
@@ -0,0 +1,8 @@
+QT       += core gui quick widgets quickwidgets
+
+TARGET = quickwidget
+TEMPLATE = app
+
+SOURCES += main.cpp
+
+RESOURCES += quickwidget.qrc
diff --git a/examples/quick/quickwidgets/quickwidget/quickwidget.qrc b/examples/quick/quickwidgets/quickwidget/quickwidget.qrc
new file mode 100644
index 0000000000..c073b7b80d
--- /dev/null
+++ b/examples/quick/quickwidgets/quickwidget/quickwidget.qrc
@@ -0,0 +1,5 @@
+<RCC>
+    <qresource prefix="/quickwidget">
+        <file>rotatingsquare.qml</file>
+    </qresource>
+</RCC>
diff --git a/examples/quick/quickwidgets/quickwidget/rotatingsquare.qml b/examples/quick/quickwidgets/quickwidget/rotatingsquare.qml
new file mode 100644
index 0000000000..a5becfba38
--- /dev/null
+++ b/examples/quick/quickwidgets/quickwidget/rotatingsquare.qml
@@ -0,0 +1,60 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
+**     of its contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+
+Rectangle {
+    id: root
+
+    Rectangle {
+        property int d: 100
+        id: square
+        width: d
+        height: d
+        anchors.centerIn: parent
+        color: "red"
+        NumberAnimation on rotation { from: 0; to: 360; duration: 2000; loops: Animation.Infinite; }
+    }
+
+    Text {
+        anchors.centerIn: parent
+        text: "Qt Quick running in a widget"
+    }
+}
diff --git a/examples/quick/quickwidgets/quickwidgets.pro b/examples/quick/quickwidgets/quickwidgets.pro
new file mode 100644
index 0000000000..07192b6696
--- /dev/null
+++ b/examples/quick/quickwidgets/quickwidgets.pro
@@ -0,0 +1,2 @@
+TEMPLATE = subdirs
+SUBDIRS =   quickwidget