1 files changed, 78 insertions, 0 deletions
diff --git a/src/widgets/doc/snippets/myscrollarea/myscrollarea.cpp b/src/widgets/doc/snippets/myscrollarea/myscrollarea.cpp
new file mode 100644
index 0000000000..85cd1ccce7
--- /dev/null
+++ b/src/widgets/doc/snippets/myscrollarea/myscrollarea.cpp
@@ -0,0 +1,78 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QtWidgets>
+
+class MyScrollArea : public QAbstractScrollArea
+{
+public:
+    MyScrollArea(QWidget *w);
+    void setWidget(QWidget *w);
+
+protected:
+    void scrollContentsBy(int dx, int dy) override;
+    void resizeEvent(QResizeEvent *event) override;
+
+private:
+    void updateWidgetPosition();
+    void updateArea();
+
+    QWidget *widget;
+};
+
+MyScrollArea::MyScrollArea(QWidget *widget)
+    : QAbstractScrollArea()
+{
+    setWidget(widget);
+}
+
+void MyScrollArea::setWidget(QWidget *w)
+{
+    widget = w;
+    widget->setParent(viewport());
+    if (!widget->testAttribute(Qt::WA_Resized))
+        widget->resize(widget->sizeHint());
+
+    verticalScrollBar()->setValue(0);
+    verticalScrollBar()->setValue(0);
+
+    updateArea();
+}
+
+void MyScrollArea::updateWidgetPosition()
+{
+//! [0]
+    int hvalue = horizontalScrollBar()->value();
+    int vvalue = verticalScrollBar()->value();
+    QPoint topLeft = viewport()->rect().topLeft();
+
+    widget->move(topLeft.x() - hvalue, topLeft.y() - vvalue);
+//! [0]
+}
+
+void MyScrollArea::scrollContentsBy(int dx, int dy)
+{
+    Q_UNUSED(dx);
+    Q_UNUSED(dy);
+    updateWidgetPosition();
+}
+
+void MyScrollArea::updateArea()
+{
+//! [1]
+    QSize areaSize = viewport()->size();
+    QSize  widgetSize = widget->size();
+
+    verticalScrollBar()->setPageStep(areaSize.height());
+    horizontalScrollBar()->setPageStep(areaSize.width());
+    verticalScrollBar()->setRange(0, widgetSize.height() - areaSize.height());
+    horizontalScrollBar()->setRange(0, widgetSize.width() - areaSize.width());
+    updateWidgetPosition();
+//! [1]
+}
+
+void MyScrollArea::resizeEvent(QResizeEvent *event)
+{
+    Q_UNUSED(event);
+    updateArea();
+}