From c97104f31e23315807fe24f1424b99438f91e37a Mon Sep 17 00:00:00 2001
From: Gunnar Sletta <gunnar.sletta@nokia.com>
Date: Fri, 15 Jun 2012 13:41:18 +0200
Subject: Analog clock and raster window examples

Change-Id: I36586fbaa7da25208bbc1964d2708f094d0d5c98
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>
---
 examples/gui/rasterwindow/rasterwindow.cpp | 124 +++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 examples/gui/rasterwindow/rasterwindow.cpp

(limited to 'examples/gui/rasterwindow/rasterwindow.cpp')

diff --git a/examples/gui/rasterwindow/rasterwindow.cpp b/examples/gui/rasterwindow/rasterwindow.cpp
new file mode 100644
index 0000000000..e999ed92b1
--- /dev/null
+++ b/examples/gui/rasterwindow/rasterwindow.cpp
@@ -0,0 +1,124 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** 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 Nokia Corporation 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 "rasterwindow.h"
+
+//! [1]
+RasterWindow::RasterWindow(QWindow *parent)
+    : QWindow(parent)
+    , m_update_pending(false)
+{
+    create();
+
+    setGeometry(100, 100, 300, 200);
+
+    m_backingStore = new QBackingStore(this);
+}
+//! [1]
+
+
+//! [7]
+bool RasterWindow::event(QEvent *event)
+{
+    if (event->type() == QEvent::UpdateRequest) {
+        m_update_pending = false;
+        renderNow();
+        return true;
+    }
+    return QWindow::event(event);
+}
+//! [7]
+
+//! [6]
+void RasterWindow::renderLater()
+{
+    if (!m_update_pending) {
+        m_update_pending = true;
+        QCoreApplication::postEvent(this, new QEvent(QEvent::UpdateRequest));
+    }
+}
+//! [6]
+
+
+//! [5]
+void RasterWindow::resizeEvent(QResizeEvent *resizeEvent)
+{
+    m_backingStore->resize(resizeEvent->size());
+    if (isExposed())
+        renderNow();
+}
+//! [5]
+
+//! [2]
+void RasterWindow::exposeEvent(QExposeEvent *)
+{
+    if (isExposed()) {
+        renderNow();
+    }
+}
+//! [2]
+
+
+//! [3]
+void RasterWindow::renderNow()
+{
+    if (!isExposed())
+        return;
+
+    QRect rect(0, 0, width(), height());
+    m_backingStore->beginPaint(rect);
+
+    QPaintDevice *device = m_backingStore->paintDevice();
+    QPainter painter(device);
+
+    painter.fillRect(0, 0, width(), height(), Qt::white);
+    render(&painter);
+
+    m_backingStore->endPaint();
+    m_backingStore->flush(rect);
+}
+//! [3]
+
+//! [4]
+void RasterWindow::render(QPainter *painter)
+{
+    painter->drawText(QRectF(0, 0, width(), height()), Qt::AlignCenter, QStringLiteral("QWindow"));
+}
+//! [4]
-- 
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