Add custom widget shiboken example

This example is based on the WigglyWidget Qt/C++ example,
and shows two ways of using a Custom Widget:

* A full translation to Python, wigglywidget.py
* Exposing the widget via Shiboken.

The main.py file includes both scenarios and display them.

Task-number: PYSIDE-841
Change-Id: I53c6db540aae2d5672a96bcf8f0e4a3e06b7ce9e
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 111 insertions, 0 deletions

diff --git a/examples/widgetbinding/wigglywidget.cpp b/examples/widgetbinding/wigglywidget.cpp
new file mode 100644
index 000000000..ab549ef07
--- /dev/null
+++ b/examples/widgetbinding/wigglywidget.cpp
@@ -0,0 +1,111 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples 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 "wigglywidget.h"
+
+#include <QFontMetrics>
+#include <QPainter>
+#include <QTimerEvent>
+
+//! [0]
+WigglyWidget::WigglyWidget(QWidget *parent)
+    : QWidget(parent), step(0)
+{
+    setBackgroundRole(QPalette::Midlight);
+    setAutoFillBackground(true);
+
+    QFont newFont = font();
+    newFont.setPointSize(newFont.pointSize() + 20);
+    setFont(newFont);
+
+    timer.start(60, this);
+}
+//! [0]
+
+//! [1]
+void WigglyWidget::paintEvent(QPaintEvent * /* event */)
+//! [1] //! [2]
+{
+    static constexpr int sineTable[16] = {
+        0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38
+    };
+
+    QFontMetrics metrics(font());
+    int x = (width() - metrics.horizontalAdvance(text)) / 2;
+    int y = (height() + metrics.ascent() - metrics.descent()) / 2;
+    QColor color;
+//! [2]
+
+//! [3]
+    QPainter painter(this);
+//! [3] //! [4]
+    for (int i = 0; i < text.size(); ++i) {
+        int index = (step + i) % 16;
+        color.setHsv((15 - index) * 16, 255, 191);
+        painter.setPen(color);
+        painter.drawText(x, y - ((sineTable[index] * metrics.height()) / 400),
+                         QString(text[i]));
+        x += metrics.horizontalAdvance(text[i]);
+    }
+}
+//! [4]
+
+//! [5]
+void WigglyWidget::timerEvent(QTimerEvent *event)
+//! [5] //! [6]
+{
+    if (event->timerId() == timer.timerId()) {
+        ++step;
+        update();
+    } else {
+        QWidget::timerEvent(event);
+    }
+//! [6]
+}