Add an example that shows strength animation QGraphicsColorizeEffect.

When a button is pressed, a popup message is shown and the background
(everything, every items, behind the popup message) is faded to light
green.

Reviewed-by: Bjørn Erik Nilsen

7 files changed, 272 insertions, 0 deletions

diff --git a/examples/effects/fademessage/README.txt b/examples/effects/fademessage/README.txt
new file mode 100644
index 0000000..f639e76
--- /dev/null
+++ b/examples/effects/fademessage/README.txt
@@ -0,0 +1,2 @@
+The background is taken from a public domain photo at:
+http://www.photos8.com/view/windows_problem_blue-800x600.html
diff --git a/examples/effects/fademessage/background.jpg b/examples/effects/fademessage/background.jpg
new file mode 100644
index 0000000..9884233
--- /dev/null
+++ b/examples/effects/fademessage/background.jpg
diff --git a/examples/effects/fademessage/fademessage.cpp b/examples/effects/fademessage/fademessage.cpp
new file mode 100644
index 0000000..818d00f
--- /dev/null
+++ b/examples/effects/fademessage/fademessage.cpp
@@ -0,0 +1,124 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "fademessage.h"
+
+#include <QtGui>
+
+FadeMessage::FadeMessage(QWidget *parent): QGraphicsView(parent), m_index(0.0)
+{
+    setScene(&m_scene);
+    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+
+    setupScene();
+
+    m_timeLine = new QTimeLine(500, this);
+    m_timeLine->setCurveShape(QTimeLine::EaseInOutCurve);
+    connect(m_timeLine, SIGNAL(valueChanged(qreal)), m_effect, SLOT(setStrength(qreal)));
+
+    setRenderHint(QPainter::Antialiasing, true);
+    setFrameStyle(QFrame::NoFrame);
+}
+
+void FadeMessage::togglePopup()
+{
+    if (m_message->isVisible()) {
+        m_message->setVisible(false);
+        m_timeLine->setDirection(QTimeLine::Backward);
+        m_timeLine->start();
+    } else {
+        m_message->setVisible(true);
+        m_timeLine->setDirection(QTimeLine::Forward);
+        m_timeLine->start();
+    }
+}
+
+void FadeMessage::setupScene()
+{
+    QGraphicsRectItem *parent = m_scene.addRect(0, 0, 400, 600);
+    parent->setPen(Qt::NoPen);
+    parent->setZValue(0);
+
+    QGraphicsPixmapItem *bg = m_scene.addPixmap(QPixmap(":/background.jpg"));
+    bg->setParentItem(parent);
+    bg->setZValue(-1);
+
+    for (int i = 1; i < 5; ++i)
+        for (int j = 2; j < 5; ++j) {
+            QGraphicsRectItem *item = m_scene.addRect(i * 50, j * 50, 38, 38);
+            item->setParentItem(parent);
+            item->setZValue(1);
+            int hue = 12 * (i * 5 + j);
+            item->setBrush(QColor::fromHsv(hue, 128, 128));
+        }
+
+    QFont font;
+    font.setPointSize(font.pointSize() * 2);
+    font.setBold(true);
+    int fh = QFontMetrics(font).height();
+
+    QGraphicsRectItem *block = m_scene.addRect(50, 300, 300, fh + 3);
+    block->setPen(Qt::NoPen);
+    block->setBrush(QColor(102, 153, 51));
+
+    QGraphicsTextItem *text = m_scene.addText("Qt Everywhere!", font);
+    text->setDefaultTextColor(Qt::white);
+    text->setPos(50, 300);
+    block->setZValue(2);
+    block->hide();
+
+    text->setParentItem(block);
+    m_message = block;
+
+    m_effect = new QGraphicsColorizeEffect;
+    m_effect->setColor(QColor(122, 193, 66));
+    m_effect->setStrength(0);
+    m_effect->setEnabled(true);
+    parent->setGraphicsEffect(m_effect);
+
+    QPushButton *press = new QPushButton;
+    press->setText(tr("Press me"));
+    connect(press, SIGNAL(clicked()), SLOT(togglePopup()));
+    m_scene.addWidget(press);
+    press->move(300, 500);
+}
+
diff --git a/examples/effects/fademessage/fademessage.h b/examples/effects/fademessage/fademessage.h
new file mode 100644
index 0000000..34e2fb8
--- /dev/null
+++ b/examples/effects/fademessage/fademessage.h
@@ -0,0 +1,72 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef FADEMESSAGE_H
+#define FADEMESSAGE_H
+
+#include <QGraphicsEffect>
+#include <QGraphicsView>
+#include <QTimeLine>
+
+#include "fademessage.h"
+
+class FadeMessage: public QGraphicsView
+{
+    Q_OBJECT
+
+public:
+    FadeMessage(QWidget *parent = 0);
+
+private:
+    void setupScene();
+
+private slots:
+    void togglePopup();
+
+private:
+    qreal m_index;
+    QGraphicsScene m_scene;
+    QGraphicsColorizeEffect *m_effect;
+    QGraphicsItem *m_message;
+    QTimeLine *m_timeLine;
+};
+
+#endif // FADEMESSAGE_H
diff --git a/examples/effects/fademessage/fademessage.pro b/examples/effects/fademessage/fademessage.pro
new file mode 100644
index 0000000..ed9e53d
--- /dev/null
+++ b/examples/effects/fademessage/fademessage.pro
@@ -0,0 +1,13 @@
+SOURCES += main.cpp fademessage.cpp
+HEADERS += fademessage.h
+RESOURCES += fademessage.qrc
+INSTALLS += target sources
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/effects/fademessage
+sources.files = $$SOURCES \
+    $$HEADERS \
+    $$RESOURCES \
+    $$FORMS \
+    fademessage.pro
+sources.path = $$[QT_INSTALL_EXAMPLES]/effects/fademessage
diff --git a/examples/effects/fademessage/fademessage.qrc b/examples/effects/fademessage/fademessage.qrc
new file mode 100644
index 0000000..9efea6a
--- /dev/null
+++ b/examples/effects/fademessage/fademessage.qrc
@@ -0,0 +1,5 @@
+<RCC>
+    <qresource prefix="/" >
+        <file>background.jpg</file>
+    </qresource>
+</RCC>
diff --git a/examples/effects/fademessage/main.cpp b/examples/effects/fademessage/main.cpp
new file mode 100644
index 0000000..65a4291
--- /dev/null
+++ b/examples/effects/fademessage/main.cpp
@@ -0,0 +1,56 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QApplication>
+
+#include "fademessage.h"
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+
+    FadeMessage widget;
+    widget.setWindowTitle(QT_TRANSLATE_NOOP(QGraphicsView, "Popup Message with Effect"));
+    widget.setFixedSize(400, 600);
+    widget.show();
+
+    return app.exec();
+}