/****************************************************************************

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** This file is part of the demonstration applications of the Qt Toolkit.

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** this package.

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** General Public License version 2.1 as published by the Free Software

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****************************************************************************/

#include "view.h"

#include <QtGui>

#ifndef QT_NO_OPENGL

#include <QtOpenGL>

#endif

#include <qmath.h>

View::View(const QString &name, QWidget *parent)

    : QFrame(parent)

{

    setFrameStyle(Sunken | StyledPanel);

    graphicsView = new QGraphicsView;

    graphicsView->setRenderHint(QPainter::Antialiasing, false);

    graphicsView->setDragMode(QGraphicsView::RubberBandDrag);

    graphicsView->setOptimizationFlags(QGraphicsView::DontSavePainterState);

    graphicsView->setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);

    int size = style()->pixelMetric(QStyle::PM_ToolBarIconSize);

    QSize iconSize(size, size);

    QToolButton *zoomInIcon = new QToolButton;

    zoomInIcon->setAutoRepeat(true);

    zoomInIcon->setAutoRepeatInterval(33);

    zoomInIcon->setAutoRepeatDelay(0);

    zoomInIcon->setIcon(QPixmap(":/zoomin.png"));

    zoomInIcon->setIconSize(iconSize);

    QToolButton *zoomOutIcon = new QToolButton;

    zoomOutIcon->setAutoRepeat(true);

    zoomOutIcon->setAutoRepeatInterval(33);

    zoomOutIcon->setAutoRepeatDelay(0);

    zoomOutIcon->setIcon(QPixmap(":/zoomout.png"));

    zoomOutIcon->setIconSize(iconSize);

    zoomSlider = new QSlider;

    zoomSlider->setMinimum(0);

    zoomSlider->setMaximum(500);

    zoomSlider->setValue(250);

    zoomSlider->setTickPosition(QSlider::TicksRight);

    // Zoom slider layout

    QVBoxLayout *zoomSliderLayout = new QVBoxLayout;

    zoomSliderLayout->addWidget(zoomInIcon);

    zoomSliderLayout->addWidget(zoomSlider);

    zoomSliderLayout->addWidget(zoomOutIcon);

    QToolButton *rotateLeftIcon = new QToolButton;

    rotateLeftIcon->setIcon(QPixmap(":/rotateleft.png"));

    rotateLeftIcon->setIconSize(iconSize);

    QToolButton *rotateRightIcon = new QToolButton;

    rotateRightIcon->setIcon(QPixmap(":/rotateright.png"));

    rotateRightIcon->setIconSize(iconSize);

    rotateSlider = new QSlider;

    rotateSlider->setOrientation(Qt::Horizontal);

    rotateSlider->setMinimum(-360);

    rotateSlider->setMaximum(360);

    rotateSlider->setValue(0);

    rotateSlider->setTickPosition(QSlider::TicksBelow);

    // Rotate slider layout

    QHBoxLayout *rotateSliderLayout = new QHBoxLayout;

    rotateSliderLayout->addWidget(rotateLeftIcon);

    rotateSliderLayout->addWidget(rotateSlider);

    rotateSliderLayout->addWidget(rotateRightIcon);

    resetButton = new QToolButton;

    resetButton->setText(tr("0"));

    resetButton->setEnabled(false);

    // Label layout

    QHBoxLayout *labelLayout = new QHBoxLayout;

    label = new QLabel(name);

    antialiasButton = new QToolButton;

    antialiasButton->setText(tr("Antialiasing"));

    antialiasButton->setCheckable(true);

    antialiasButton->setChecked(false);

    openGlButton = new QToolButton;

    openGlButton->setText(tr("OpenGL"));

    openGlButton->setCheckable(true);

#ifndef QT_NO_OPENGL

    openGlButton->setEnabled(QGLFormat::hasOpenGL());

#else

    openGlButton->setEnabled(false);

#endif

    printButton = new QToolButton;

    printButton->setIcon(QIcon(QPixmap(":/fileprint.png")));

    labelLayout->addWidget(label);

    labelLayout->addStretch();

    labelLayout->addWidget(antialiasButton);

    labelLayout->addWidget(openGlButton);

    labelLayout->addWidget(printButton);

    QGridLayout *topLayout = new QGridLayout;

    topLayout->addLayout(labelLayout, 0, 0);

    topLayout->addWidget(graphicsView, 1, 0);

    topLayout->addLayout(zoomSliderLayout, 1, 1);

    topLayout->addLayout(rotateSliderLayout, 2, 0);

    topLayout->addWidget(resetButton, 2, 1);

    setLayout(topLayout);

    connect(resetButton, SIGNAL(clicked()), this, SLOT(resetView()));

    connect(zoomSlider, SIGNAL(valueChanged(int)), this, SLOT(setupMatrix()));

    connect(rotateSlider, SIGNAL(valueChanged(int)), this, SLOT(setupMatrix()));

    connect(graphicsView->verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(setResetButtonEnabled()));

    connect(graphicsView->horizontalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(setResetButtonEnabled()));

    connect(antialiasButton, SIGNAL(toggled(bool)), this, SLOT(toggleAntialiasing()));

    connect(openGlButton, SIGNAL(toggled(bool)), this, SLOT(toggleOpenGL()));

    connect(rotateLeftIcon, SIGNAL(clicked()), this, SLOT(rotateLeft()));

    connect(rotateRightIcon, SIGNAL(clicked()), this, SLOT(rotateRight()));

    connect(zoomInIcon, SIGNAL(clicked()), this, SLOT(zoomIn()));

    connect(zoomOutIcon, SIGNAL(clicked()), this, SLOT(zoomOut()));

    connect(printButton, SIGNAL(clicked()), this, SLOT(print()));

    setupMatrix();

}

QGraphicsView *View::view() const

{

    return graphicsView;

}

void View::resetView()

{

    zoomSlider->setValue(250);

    rotateSlider->setValue(0);

    setupMatrix();

    graphicsView->ensureVisible(QRectF(0, 0, 0, 0));

    resetButton->setEnabled(false);

}

void View::setResetButtonEnabled()

{

    resetButton->setEnabled(true);

}

void View::setupMatrix()

{

    qreal scale = qPow(qreal(2), (zoomSlider->value() - 250) / qreal(50));

    QMatrix matrix;

    matrix.scale(scale, scale);

    matrix.rotate(rotateSlider->value());

    graphicsView->setMatrix(matrix);

    setResetButtonEnabled();

}

void View::toggleOpenGL()

{

#ifndef QT_NO_OPENGL

    graphicsView->setViewport(openGlButton->isChecked() ? new QGLWidget(QGLFormat(QGL::SampleBuffers)) : new QWidget);

#endif

}

void View::toggleAntialiasing()

{

    graphicsView->setRenderHint(QPainter::Antialiasing, antialiasButton->isChecked());

}

void View::print()

{

#ifndef QT_NO_PRINTER

    QPrinter printer;

    QPrintDialog dialog(&printer, this);

    if (dialog.exec() == QDialog::Accepted) {

        QPainter painter(&printer);

        graphicsView->render(&painter);

    }

#endif

}

void View::zoomIn()

{

    zoomSlider->setValue(zoomSlider->value() + 1);

}

void View::zoomOut()

{

    zoomSlider->setValue(zoomSlider->value() - 1);

}

void View::rotateLeft()

{

    rotateSlider->setValue(rotateSlider->value() - 10);

}

void View::rotateRight()

{

    rotateSlider->setValue(rotateSlider->value() + 10);

}