Doc: Clean up widget snippets project

The main snippets project must be a subdirs project.
Move some files and update the affected documentation.

Task-number: QTBUG-86497
Pick-to: 5.15
Change-Id: I60073d1b8bd53aa09600eeccf06ba8457ac7c708
Reviewed-by: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io>

1 files changed, 149 insertions, 0 deletions

diff --git a/src/widgets/doc/snippets/graphicsview/graphicsview.cpp b/src/widgets/doc/snippets/graphicsview/graphicsview.cpp
new file mode 100644
index 0000000000..29187ba326
--- /dev/null
+++ b/src/widgets/doc/snippets/graphicsview/graphicsview.cpp
@@ -0,0 +1,149 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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 https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, 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 The Qt Company Ltd 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 <QDrag>
+#include <QGraphicsSceneMouseEvent>
+#include <QGraphicsView>
+#include <QMimeData>
+#include <QOpenGLWidget>
+#include <QPrintDialog>
+#include <QPrinter>
+#include <QStandardItem>
+
+void graphicsview_snippet_main()
+{
+//! [0]
+QGraphicsScene scene;
+QGraphicsRectItem *rect = scene.addRect(QRectF(0, 0, 100, 100));
+
+QGraphicsItem *item = scene.itemAt(50, 50, QTransform());
+//! [0]
+Q_UNUSED(rect);
+Q_UNUSED(item);
+}
+
+void myPopulateScene(QGraphicsScene *)
+{
+    // Intentionally left empty
+}
+
+void snippetThatUsesMyPopulateScene()
+{
+//! [1]
+QGraphicsScene scene;
+myPopulateScene(&scene);
+QGraphicsView view(&scene);
+view.show();
+//! [1]
+}
+
+class CustomItem : public QStandardItem
+{
+public:
+    using QStandardItem::QStandardItem;
+
+    int type() const override { return UserType; }
+    void mousePressEvent(QGraphicsSceneMouseEvent *event);
+    QStandardItem *clone() const override { return new CustomItem; }
+};
+
+
+void printScene()
+{
+//! [3]
+QGraphicsScene scene;
+QPrinter printer;
+scene.addRect(QRectF(0, 0, 100, 200), QPen(Qt::black), QBrush(Qt::green));
+
+if (QPrintDialog(&printer).exec() == QDialog::Accepted) {
+    QPainter painter(&printer);
+    painter.setRenderHint(QPainter::Antialiasing);
+    scene.render(&painter);
+}
+//! [3]
+}
+
+void pixmapScene()
+{
+//! [4]
+QGraphicsScene scene;
+scene.addRect(QRectF(0, 0, 100, 200), QPen(Qt::black), QBrush(Qt::green));
+
+QPixmap pixmap;
+QPainter painter(&pixmap);
+painter.setRenderHint(QPainter::Antialiasing);
+scene.render(&painter);
+painter.end();
+
+pixmap.save("scene.png");
+//! [4]
+}
+
+//! [5]
+void CustomItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
+{
+    QMimeData *data = new QMimeData;
+    QDrag *drag = new QDrag(event->widget());
+    drag->setMimeData(data);
+    drag->exec();
+}
+//! [5]
+
+void viewScene()
+{
+QGraphicsScene scene;
+//! [6]
+QGraphicsView view(&scene);
+QOpenGLWidget *gl = new QOpenGLWidget();
+QSurfaceFormat format;
+format.setSamples(4);
+gl->setFormat(format);
+view.setViewport(gl);
+//! [6]
+}