1 files changed, 125 insertions, 0 deletions
diff --git a/src/widgets/doc/snippets/myscrollarea/myscrollarea.cpp b/src/widgets/doc/snippets/myscrollarea/myscrollarea.cpp
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+++ b/src/widgets/doc/snippets/myscrollarea/myscrollarea.cpp
@@ -0,0 +1,125 @@
+/****************************************************************************
+**
+** 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 <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();
+}