Move all other demos in qtbase to examples.

Change-Id: Iab0e7364d1f6b348d0e3033ea9304139f5bd6d0d
Reviewed-on: http://codereview.qt.nokia.com/617
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: David Boddie

1 files changed, 516 insertions, 0 deletions

diff --git a/examples/painting/gradients/gradients.cpp b/examples/painting/gradients/gradients.cpp
new file mode 100644
index 0000000000..d8b739b3b0
--- /dev/null
+++ b/examples/painting/gradients/gradients.cpp
@@ -0,0 +1,516 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "gradients.h"
+#include "hoverpoints.h"
+
+ShadeWidget::ShadeWidget(ShadeType type, QWidget *parent)
+    : QWidget(parent), m_shade_type(type), m_alpha_gradient(QLinearGradient(0, 0, 0, 0))
+{
+
+    // Checkers background
+    if (m_shade_type == ARGBShade) {
+        QPixmap pm(20, 20);
+        QPainter pmp(&pm);
+        pmp.fillRect(0, 0, 10, 10, Qt::lightGray);
+        pmp.fillRect(10, 10, 10, 10, Qt::lightGray);
+        pmp.fillRect(0, 10, 10, 10, Qt::darkGray);
+        pmp.fillRect(10, 0, 10, 10, Qt::darkGray);
+        pmp.end();
+        QPalette pal = palette();
+        pal.setBrush(backgroundRole(), QBrush(pm));
+        setAutoFillBackground(true);
+        setPalette(pal);
+
+    } else {
+        setAttribute(Qt::WA_NoBackground);
+
+    }
+
+    QPolygonF points;
+    points << QPointF(0, sizeHint().height())
+           << QPointF(sizeHint().width(), 0);
+
+    m_hoverPoints = new HoverPoints(this, HoverPoints::CircleShape);
+//     m_hoverPoints->setConnectionType(HoverPoints::LineConnection);
+    m_hoverPoints->setPoints(points);
+    m_hoverPoints->setPointLock(0, HoverPoints::LockToLeft);
+    m_hoverPoints->setPointLock(1, HoverPoints::LockToRight);
+    m_hoverPoints->setSortType(HoverPoints::XSort);
+
+    setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
+
+    connect(m_hoverPoints, SIGNAL(pointsChanged(QPolygonF)), this, SIGNAL(colorsChanged()));
+}
+
+
+QPolygonF ShadeWidget::points() const
+{
+    return m_hoverPoints->points();
+}
+
+
+uint ShadeWidget::colorAt(int x)
+{
+    generateShade();
+
+    QPolygonF pts = m_hoverPoints->points();
+    for (int i=1; i < pts.size(); ++i) {
+        if (pts.at(i-1).x() <= x && pts.at(i).x() >= x) {
+            QLineF l(pts.at(i-1), pts.at(i));
+            l.setLength(l.length() * ((x - l.x1()) / l.dx()));
+            return m_shade.pixel(qRound(qMin(l.x2(), (qreal(m_shade.width() - 1)))),
+                                 qRound(qMin(l.y2(), qreal(m_shade.height() - 1))));
+        }
+    }
+    return 0;
+}
+
+
+void ShadeWidget::setGradientStops(const QGradientStops &stops)
+{
+    if (m_shade_type == ARGBShade) {
+        m_alpha_gradient = QLinearGradient(0, 0, width(), 0);
+
+        for (int i=0; i<stops.size(); ++i) {
+            QColor c = stops.at(i).second;
+            m_alpha_gradient.setColorAt(stops.at(i).first, QColor(c.red(), c.green(), c.blue()));
+        }
+
+        m_shade = QImage();
+        generateShade();
+        update();
+    }
+}
+
+
+void ShadeWidget::paintEvent(QPaintEvent *)
+{
+    generateShade();
+
+    QPainter p(this);
+    p.drawImage(0, 0, m_shade);
+
+    p.setPen(QColor(146, 146, 146));
+    p.drawRect(0, 0, width() - 1, height() - 1);
+}
+
+
+void ShadeWidget::generateShade()
+{
+    if (m_shade.isNull() || m_shade.size() != size()) {
+
+        if (m_shade_type == ARGBShade) {
+            m_shade = QImage(size(), QImage::Format_ARGB32_Premultiplied);
+            m_shade.fill(0);
+
+            QPainter p(&m_shade);
+            p.fillRect(rect(), m_alpha_gradient);
+
+            p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
+            QLinearGradient fade(0, 0, 0, height());
+            fade.setColorAt(0, QColor(0, 0, 0, 255));
+            fade.setColorAt(1, QColor(0, 0, 0, 0));
+            p.fillRect(rect(), fade);
+
+        } else {
+            m_shade = QImage(size(), QImage::Format_RGB32);
+            QLinearGradient shade(0, 0, 0, height());
+            shade.setColorAt(1, Qt::black);
+
+            if (m_shade_type == RedShade)
+                shade.setColorAt(0, Qt::red);
+            else if (m_shade_type == GreenShade)
+                shade.setColorAt(0, Qt::green);
+            else
+                shade.setColorAt(0, Qt::blue);
+
+            QPainter p(&m_shade);
+            p.fillRect(rect(), shade);
+        }
+    }
+
+
+}
+
+
+GradientEditor::GradientEditor(QWidget *parent)
+    : QWidget(parent)
+{
+    QVBoxLayout *vbox = new QVBoxLayout(this);
+    vbox->setSpacing(1);
+    vbox->setMargin(1);
+
+    m_red_shade = new ShadeWidget(ShadeWidget::RedShade, this);
+    m_green_shade = new ShadeWidget(ShadeWidget::GreenShade, this);
+    m_blue_shade = new ShadeWidget(ShadeWidget::BlueShade, this);
+    m_alpha_shade = new ShadeWidget(ShadeWidget::ARGBShade, this);
+
+    vbox->addWidget(m_red_shade);
+    vbox->addWidget(m_green_shade);
+    vbox->addWidget(m_blue_shade);
+    vbox->addWidget(m_alpha_shade);
+
+    connect(m_red_shade, SIGNAL(colorsChanged()), this, SLOT(pointsUpdated()));
+    connect(m_green_shade, SIGNAL(colorsChanged()), this, SLOT(pointsUpdated()));
+    connect(m_blue_shade, SIGNAL(colorsChanged()), this, SLOT(pointsUpdated()));
+    connect(m_alpha_shade, SIGNAL(colorsChanged()), this, SLOT(pointsUpdated()));
+}
+
+
+inline static bool x_less_than(const QPointF &p1, const QPointF &p2)
+{
+    return p1.x() < p2.x();
+}
+
+
+void GradientEditor::pointsUpdated()
+{
+    qreal w = m_alpha_shade->width();
+
+    QGradientStops stops;
+
+    QPolygonF points;
+
+    points += m_red_shade->points();
+    points += m_green_shade->points();
+    points += m_blue_shade->points();
+    points += m_alpha_shade->points();
+
+    qSort(points.begin(), points.end(), x_less_than);
+
+    for (int i=0; i<points.size(); ++i) {
+        qreal x = int(points.at(i).x());
+        if (i < points.size() - 1 && x == points.at(i+1).x())
+            continue;
+        QColor color((0x00ff0000 & m_red_shade->colorAt(int(x))) >> 16,
+                     (0x0000ff00 & m_green_shade->colorAt(int(x))) >> 8,
+                     (0x000000ff & m_blue_shade->colorAt(int(x))),
+                     (0xff000000 & m_alpha_shade->colorAt(int(x))) >> 24);
+
+        if (x / w > 1)
+            return;
+
+        stops << QGradientStop(x / w, color);
+    }
+
+    m_alpha_shade->setGradientStops(stops);
+
+    emit gradientStopsChanged(stops);
+}
+
+
+static void set_shade_points(const QPolygonF &points, ShadeWidget *shade)
+{
+    shade->hoverPoints()->setPoints(points);
+    shade->hoverPoints()->setPointLock(0, HoverPoints::LockToLeft);
+    shade->hoverPoints()->setPointLock(points.size() - 1, HoverPoints::LockToRight);
+    shade->update();
+}
+
+void GradientEditor::setGradientStops(const QGradientStops &stops)
+{
+    QPolygonF pts_red, pts_green, pts_blue, pts_alpha;
+
+    qreal h_red = m_red_shade->height();
+    qreal h_green = m_green_shade->height();
+    qreal h_blue = m_blue_shade->height();
+    qreal h_alpha = m_alpha_shade->height();
+
+    for (int i=0; i<stops.size(); ++i) {
+        qreal pos = stops.at(i).first;
+        QRgb color = stops.at(i).second.rgba();
+        pts_red << QPointF(pos * m_red_shade->width(), h_red - qRed(color) * h_red / 255);
+        pts_green << QPointF(pos * m_green_shade->width(), h_green - qGreen(color) * h_green / 255);
+        pts_blue << QPointF(pos * m_blue_shade->width(), h_blue - qBlue(color) * h_blue / 255);
+        pts_alpha << QPointF(pos * m_alpha_shade->width(), h_alpha - qAlpha(color) * h_alpha / 255);
+    }
+
+    set_shade_points(pts_red, m_red_shade);
+    set_shade_points(pts_green, m_green_shade);
+    set_shade_points(pts_blue, m_blue_shade);
+    set_shade_points(pts_alpha, m_alpha_shade);
+
+}
+
+GradientWidget::GradientWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    setWindowTitle(tr("Gradients"));
+
+    m_renderer = new GradientRenderer(this);
+
+    QGroupBox *mainGroup = new QGroupBox(this);
+    mainGroup->setTitle(tr("Gradients"));
+
+    QGroupBox *editorGroup = new QGroupBox(mainGroup);
+    editorGroup->setTitle(tr("Color Editor"));
+    m_editor = new GradientEditor(editorGroup);
+
+    QGroupBox *typeGroup = new QGroupBox(mainGroup);
+    typeGroup->setTitle(tr("Gradient Type"));
+    m_linearButton = new QRadioButton(tr("Linear Gradient"), typeGroup);
+    m_radialButton = new QRadioButton(tr("Radial Gradient"), typeGroup);
+    m_conicalButton = new QRadioButton(tr("Conical Gradient"), typeGroup);
+
+    QGroupBox *spreadGroup = new QGroupBox(mainGroup);
+    spreadGroup->setTitle(tr("Spread Method"));
+    m_padSpreadButton = new QRadioButton(tr("Pad Spread"), spreadGroup);
+    m_reflectSpreadButton = new QRadioButton(tr("Reflect Spread"), spreadGroup);
+    m_repeatSpreadButton = new QRadioButton(tr("Repeat Spread"), spreadGroup);
+
+    QGroupBox *defaultsGroup = new QGroupBox(mainGroup);
+    defaultsGroup->setTitle(tr("Defaults"));
+    QPushButton *default1Button = new QPushButton(tr("1"), defaultsGroup);
+    QPushButton *default2Button = new QPushButton(tr("2"), defaultsGroup);
+    QPushButton *default3Button = new QPushButton(tr("3"), defaultsGroup);
+    QPushButton *default4Button = new QPushButton(tr("Reset"), editorGroup);
+
+    QPushButton *showSourceButton = new QPushButton(mainGroup);
+    showSourceButton->setText(tr("Show Source"));
+#ifdef QT_OPENGL_SUPPORT
+    QPushButton *enableOpenGLButton = new QPushButton(mainGroup);
+    enableOpenGLButton->setText(tr("Use OpenGL"));
+    enableOpenGLButton->setCheckable(true);
+    enableOpenGLButton->setChecked(m_renderer->usesOpenGL());
+    if (!QGLFormat::hasOpenGL())
+        enableOpenGLButton->hide();
+#endif
+    QPushButton *whatsThisButton = new QPushButton(mainGroup);
+    whatsThisButton->setText(tr("What's This?"));
+    whatsThisButton->setCheckable(true);
+
+    // Layouts
+    QHBoxLayout *mainLayout = new QHBoxLayout(this);
+    mainLayout->addWidget(m_renderer);
+    mainLayout->addWidget(mainGroup);
+
+    mainGroup->setFixedWidth(180);
+    QVBoxLayout *mainGroupLayout = new QVBoxLayout(mainGroup);
+    mainGroupLayout->addWidget(editorGroup);
+    mainGroupLayout->addWidget(typeGroup);
+    mainGroupLayout->addWidget(spreadGroup);
+    mainGroupLayout->addWidget(defaultsGroup);
+    mainGroupLayout->addStretch(1);
+    mainGroupLayout->addWidget(showSourceButton);
+#ifdef QT_OPENGL_SUPPORT
+    mainGroupLayout->addWidget(enableOpenGLButton);
+#endif
+    mainGroupLayout->addWidget(whatsThisButton);
+
+    QVBoxLayout *editorGroupLayout = new QVBoxLayout(editorGroup);
+    editorGroupLayout->addWidget(m_editor);
+
+    QVBoxLayout *typeGroupLayout = new QVBoxLayout(typeGroup);
+    typeGroupLayout->addWidget(m_linearButton);
+    typeGroupLayout->addWidget(m_radialButton);
+    typeGroupLayout->addWidget(m_conicalButton);
+
+    QVBoxLayout *spreadGroupLayout = new QVBoxLayout(spreadGroup);
+    spreadGroupLayout->addWidget(m_padSpreadButton);
+    spreadGroupLayout->addWidget(m_repeatSpreadButton);
+    spreadGroupLayout->addWidget(m_reflectSpreadButton);
+
+    QHBoxLayout *defaultsGroupLayout = new QHBoxLayout(defaultsGroup);
+    defaultsGroupLayout->addWidget(default1Button);
+    defaultsGroupLayout->addWidget(default2Button);
+    defaultsGroupLayout->addWidget(default3Button);
+    editorGroupLayout->addWidget(default4Button);
+
+    connect(m_editor, SIGNAL(gradientStopsChanged(QGradientStops)),
+            m_renderer, SLOT(setGradientStops(QGradientStops)));
+
+    connect(m_linearButton, SIGNAL(clicked()), m_renderer, SLOT(setLinearGradient()));
+    connect(m_radialButton, SIGNAL(clicked()), m_renderer, SLOT(setRadialGradient()));
+    connect(m_conicalButton, SIGNAL(clicked()), m_renderer, SLOT(setConicalGradient()));
+
+    connect(m_padSpreadButton, SIGNAL(clicked()), m_renderer, SLOT(setPadSpread()));
+    connect(m_reflectSpreadButton, SIGNAL(clicked()), m_renderer, SLOT(setReflectSpread()));
+    connect(m_repeatSpreadButton, SIGNAL(clicked()), m_renderer, SLOT(setRepeatSpread()));
+
+    connect(default1Button, SIGNAL(clicked()), this, SLOT(setDefault1()));
+    connect(default2Button, SIGNAL(clicked()), this, SLOT(setDefault2()));
+    connect(default3Button, SIGNAL(clicked()), this, SLOT(setDefault3()));
+    connect(default4Button, SIGNAL(clicked()), this, SLOT(setDefault4()));
+
+    connect(showSourceButton, SIGNAL(clicked()), m_renderer, SLOT(showSource()));
+#ifdef QT_OPENGL_SUPPORT
+    connect(enableOpenGLButton, SIGNAL(clicked(bool)), m_renderer, SLOT(enableOpenGL(bool)));
+#endif    
+    connect(whatsThisButton, SIGNAL(clicked(bool)), m_renderer, SLOT(setDescriptionEnabled(bool)));
+    connect(whatsThisButton, SIGNAL(clicked(bool)),
+            m_renderer->hoverPoints(), SLOT(setDisabled(bool)));
+    connect(m_renderer, SIGNAL(descriptionEnabledChanged(bool)),
+            whatsThisButton, SLOT(setChecked(bool)));
+    connect(m_renderer, SIGNAL(descriptionEnabledChanged(bool)),
+            m_renderer->hoverPoints(), SLOT(setDisabled(bool)));
+
+    m_renderer->loadSourceFile(":res/gradients/gradients.cpp");
+    m_renderer->loadDescription(":res/gradients/gradients.html");
+
+    QTimer::singleShot(50, this, SLOT(setDefault1()));
+}
+
+void GradientWidget::setDefault(int config)
+{
+    QGradientStops stops;
+    QPolygonF points;
+    switch (config) {
+    case 1:
+        stops << QGradientStop(0.00, QColor::fromRgba(0));
+        stops << QGradientStop(0.04, QColor::fromRgba(0xff131360));
+        stops << QGradientStop(0.08, QColor::fromRgba(0xff202ccc));
+        stops << QGradientStop(0.42, QColor::fromRgba(0xff93d3f9));
+        stops << QGradientStop(0.51, QColor::fromRgba(0xffb3e6ff));
+        stops << QGradientStop(0.73, QColor::fromRgba(0xffffffec));
+        stops << QGradientStop(0.92, QColor::fromRgba(0xff5353d9));
+        stops << QGradientStop(0.96, QColor::fromRgba(0xff262666));
+        stops << QGradientStop(1.00, QColor::fromRgba(0));
+        m_linearButton->animateClick();
+        m_repeatSpreadButton->animateClick();
+        break;
+
+    case 2:
+        stops << QGradientStop(0.00, QColor::fromRgba(0xffffffff));
+        stops << QGradientStop(0.11, QColor::fromRgba(0xfff9ffa0));
+        stops << QGradientStop(0.13, QColor::fromRgba(0xfff9ff99));
+        stops << QGradientStop(0.14, QColor::fromRgba(0xfff3ff86));
+        stops << QGradientStop(0.49, QColor::fromRgba(0xff93b353));
+        stops << QGradientStop(0.87, QColor::fromRgba(0xff264619));
+        stops << QGradientStop(0.96, QColor::fromRgba(0xff0c1306));
+        stops << QGradientStop(1.00, QColor::fromRgba(0));
+        m_radialButton->animateClick();
+        m_padSpreadButton->animateClick();
+        break;
+
+    case 3:
+        stops << QGradientStop(0.00, QColor::fromRgba(0));
+        stops << QGradientStop(0.10, QColor::fromRgba(0xffe0cc73));
+        stops << QGradientStop(0.17, QColor::fromRgba(0xffc6a006));
+        stops << QGradientStop(0.46, QColor::fromRgba(0xff600659));
+        stops << QGradientStop(0.72, QColor::fromRgba(0xff0680ac));
+        stops << QGradientStop(0.92, QColor::fromRgba(0xffb9d9e6));
+        stops << QGradientStop(1.00, QColor::fromRgba(0));
+        m_conicalButton->animateClick();
+        m_padSpreadButton->animateClick();
+        break;
+
+    case 4:
+        stops << QGradientStop(0.00, QColor::fromRgba(0xff000000));
+        stops << QGradientStop(1.00, QColor::fromRgba(0xffffffff));
+        break;
+
+    default:
+        qWarning("bad default: %d\n", config);
+        break;
+    }
+
+    QPolygonF pts;
+    int h_off = m_renderer->width() / 10;
+    int v_off = m_renderer->height() / 8;
+    pts << QPointF(m_renderer->width() / 2, m_renderer->height() / 2)
+        << QPointF(m_renderer->width() / 2 - h_off, m_renderer->height() / 2 - v_off);
+
+    m_editor->setGradientStops(stops);
+    m_renderer->hoverPoints()->setPoints(pts);
+    m_renderer->setGradientStops(stops);
+}
+
+
+GradientRenderer::GradientRenderer(QWidget *parent)
+    : ArthurFrame(parent)
+{
+    m_hoverPoints = new HoverPoints(this, HoverPoints::CircleShape);
+    m_hoverPoints->setPointSize(QSize(20, 20));
+    m_hoverPoints->setConnectionType(HoverPoints::NoConnection);
+    m_hoverPoints->setEditable(false);
+
+    QVector<QPointF> points;
+    points << QPointF(100, 100) << QPointF(200, 200);
+    m_hoverPoints->setPoints(points);
+
+    m_spread = QGradient::PadSpread;
+    m_gradientType = Qt::LinearGradientPattern;
+}
+
+void GradientRenderer::setGradientStops(const QGradientStops &stops)
+{
+    m_stops = stops;
+    update();
+}
+
+
+void GradientRenderer::mousePressEvent(QMouseEvent *)
+{
+    setDescriptionEnabled(false);
+}
+
+void GradientRenderer::paint(QPainter *p)
+{
+    QPolygonF pts = m_hoverPoints->points();
+
+    QGradient g;
+
+    if (m_gradientType == Qt::LinearGradientPattern) {
+        g = QLinearGradient(pts.at(0), pts.at(1));
+
+    } else if (m_gradientType == Qt::RadialGradientPattern) {
+        g = QRadialGradient(pts.at(0), qMin(width(), height()) / 3.0, pts.at(1));
+
+    } else {
+        QLineF l(pts.at(0), pts.at(1));
+        qreal angle = l.angle(QLineF(0, 0, 1, 0));
+        if (l.dy() > 0)
+            angle = 360 - angle;
+        g = QConicalGradient(pts.at(0), angle);
+    }
+
+    for (int i=0; i<m_stops.size(); ++i)
+        g.setColorAt(m_stops.at(i).first, m_stops.at(i).second);
+
+    g.setSpread(m_spread);
+
+    p->setBrush(g);
+    p->setPen(Qt::NoPen);
+
+    p->drawRect(rect());
+
+}