view.cpp Example File

graphicsview/chip/view.cpp
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#include "view.h" #if defined(QT_PRINTSUPPORT_LIB) #include <QtPrintSupport/qtprintsupportglobal.h> #if QT_CONFIG(printdialog) #include <QPrinter> #include <QPrintDialog> #endif #endif #ifndef QT_NO_OPENGL #include <QtOpenGL> #else #include <QtWidgets> #endif #include <qmath.h> #if QT_CONFIG(wheelevent) void GraphicsView::wheelEvent(QWheelEvent *e) { if (e->modifiers() & Qt::ControlModifier) { if (e->delta() > 0) view->zoomIn(6); else view->zoomOut(6); e->accept(); } else { QGraphicsView::wheelEvent(e); } } #endif View::View(const QString &name, QWidget *parent) : QFrame(parent) { setFrameStyle(Sunken | StyledPanel); graphicsView = new GraphicsView(this); graphicsView->setRenderHint(QPainter::Antialiasing, false); graphicsView->setDragMode(QGraphicsView::RubberBandDrag); graphicsView->setOptimizationFlags(QGraphicsView::DontSavePainterState); graphicsView->setViewportUpdateMode(QGraphicsView::SmartViewportUpdate); graphicsView->setTransformationAnchor(QGraphicsView::AnchorUnderMouse); 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); label2 = new QLabel(tr("Pointer Mode")); selectModeButton = new QToolButton; selectModeButton->setText(tr("Select")); selectModeButton->setCheckable(true); selectModeButton->setChecked(true); dragModeButton = new QToolButton; dragModeButton->setText(tr("Drag")); dragModeButton->setCheckable(true); dragModeButton->setChecked(false); 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"))); QButtonGroup *pointerModeGroup = new QButtonGroup(this); pointerModeGroup->setExclusive(true); pointerModeGroup->addButton(selectModeButton); pointerModeGroup->addButton(dragModeButton); labelLayout->addWidget(label); labelLayout->addStretch(); labelLayout->addWidget(label2); labelLayout->addWidget(selectModeButton); labelLayout->addWidget(dragModeButton); 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(selectModeButton, SIGNAL(toggled(bool)), this, SLOT(togglePointerMode())); connect(dragModeButton, SIGNAL(toggled(bool)), this, SLOT(togglePointerMode())); 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 static_cast<QGraphicsView *>(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::togglePointerMode() { graphicsView->setDragMode(selectModeButton->isChecked() ? QGraphicsView::RubberBandDrag : QGraphicsView::ScrollHandDrag); graphicsView->setInteractive(selectModeButton->isChecked()); } 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() { #if QT_CONFIG(printdialog) QPrinter printer; QPrintDialog dialog(&printer, this); if (dialog.exec() == QDialog::Accepted) { QPainter painter(&printer); graphicsView->render(&painter); } #endif } void View::zoomIn(int level) { zoomSlider->setValue(zoomSlider->value() + level); } void View::zoomOut(int level) { zoomSlider->setValue(zoomSlider->value() - level); } void View::rotateLeft() { rotateSlider->setValue(rotateSlider->value() - 10); } void View::rotateRight() { rotateSlider->setValue(rotateSlider->value() + 10); }