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>

1 files changed, 112 insertions, 0 deletions

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"