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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #include <QtWidgets> |
| #if defined(QT_PRINTSUPPORT_LIB) |
| #include <QtPrintSupport/qtprintsupportglobal.h> |
| #if QT_CONFIG(printdialog) |
| #include <QPrinter> |
| #include <QPrintDialog> |
| #endif |
| #endif |
| |
| #include "scribblearea.h" |
| |
| static const qreal MinimumDiameter = 3.0; |
| static const qreal MaximumDiameter = 50.0; |
| |
| //! [0] |
| ScribbleArea::ScribbleArea(QWidget *parent) |
| : QWidget(parent) |
| { |
| setAttribute(Qt::WA_AcceptTouchEvents); |
| setAttribute(Qt::WA_StaticContents); |
| modified = false; |
| |
| myPenColors |
| << QColor("green") |
| << QColor("purple") |
| << QColor("red") |
| << QColor("blue") |
| << QColor("yellow") |
| |
| << QColor("pink") |
| << QColor("orange") |
| << QColor("brown") |
| << QColor("grey") |
| << QColor("black"); |
| } |
| //! [0] |
| |
| //! [1] |
| bool ScribbleArea::openImage(const QString &fileName) |
| //! [1] //! [2] |
| { |
| QImage loadedImage; |
| if (!loadedImage.load(fileName)) |
| return false; |
| |
| QSize newSize = loadedImage.size().expandedTo(size()); |
| resizeImage(&loadedImage, newSize); |
| image = loadedImage; |
| modified = false; |
| update(); |
| return true; |
| } |
| //! [2] |
| |
| //! [3] |
| bool ScribbleArea::saveImage(const QString &fileName, const char *fileFormat) |
| //! [3] //! [4] |
| { |
| QImage visibleImage = image; |
| resizeImage(&visibleImage, size()); |
| |
| if (visibleImage.save(fileName, fileFormat)) { |
| modified = false; |
| return true; |
| } else { |
| return false; |
| } |
| } |
| //! [4] |
| |
| //! [9] |
| void ScribbleArea::clearImage() |
| //! [9] //! [10] |
| { |
| image.fill(qRgb(255, 255, 255)); |
| modified = true; |
| update(); |
| } |
| //! [10] |
| |
| //! [12] //! [13] |
| void ScribbleArea::paintEvent(QPaintEvent *event) |
| //! [13] //! [14] |
| { |
| QPainter painter(this); |
| const QRect rect = event->rect(); |
| painter.drawImage(rect.topLeft(), image, rect); |
| } |
| //! [14] |
| |
| //! [15] |
| void ScribbleArea::resizeEvent(QResizeEvent *event) |
| //! [15] //! [16] |
| { |
| if (width() > image.width() || height() > image.height()) { |
| int newWidth = qMax(width() + 128, image.width()); |
| int newHeight = qMax(height() + 128, image.height()); |
| resizeImage(&image, QSize(newWidth, newHeight)); |
| update(); |
| } |
| QWidget::resizeEvent(event); |
| } |
| //! [16] |
| |
| //! [19] |
| void ScribbleArea::resizeImage(QImage *image, const QSize &newSize) |
| //! [19] //! [20] |
| { |
| if (image->size() == newSize) |
| return; |
| |
| QImage newImage(newSize, QImage::Format_RGB32); |
| newImage.fill(qRgb(255, 255, 255)); |
| QPainter painter(&newImage); |
| painter.drawImage(QPoint(0, 0), *image); |
| *image = newImage; |
| } |
| //! [20] |
| |
| //! [21] |
| void ScribbleArea::print() |
| { |
| #if QT_CONFIG(printdialog) |
| QPrinter printer(QPrinter::HighResolution); |
| |
| QPrintDialog printDialog(&printer, this); |
| //! [21] //! [22] |
| if (printDialog.exec() == QDialog::Accepted) { |
| QPainter painter(&printer); |
| QRect rect = painter.viewport(); |
| QSize size = image.size(); |
| size.scale(rect.size(), Qt::KeepAspectRatio); |
| painter.setViewport(rect.x(), rect.y(), size.width(), size.height()); |
| painter.setWindow(image.rect()); |
| painter.drawImage(0, 0, image); |
| } |
| #endif // QT_CONFIG(printdialog) |
| } |
| //! [22] |
| |
| bool ScribbleArea::event(QEvent *event) |
| { |
| switch (event->type()) { |
| case QEvent::TouchBegin: |
| case QEvent::TouchUpdate: |
| case QEvent::TouchEnd: |
| { |
| const QTouchEvent *touch = static_cast<QTouchEvent *>(event); |
| const QList<QTouchEvent::TouchPoint> touchPoints = static_cast<QTouchEvent *>(event)->touchPoints(); |
| for (const QTouchEvent::TouchPoint &touchPoint : touchPoints) { |
| switch (touchPoint.state()) { |
| case Qt::TouchPointStationary: |
| case Qt::TouchPointReleased: |
| // don't do anything if this touch point hasn't moved or has been released |
| continue; |
| default: |
| { |
| QRectF rect = touchPoint.rect(); |
| if (rect.isEmpty()) { |
| qreal diameter = MaximumDiameter; |
| if (touch->device()->capabilities() & QTouchDevice::Pressure) |
| diameter = MinimumDiameter + (MaximumDiameter - MinimumDiameter) * touchPoint.pressure(); |
| rect.setSize(QSizeF(diameter, diameter)); |
| } |
| |
| QPainter painter(&image); |
| painter.setPen(Qt::NoPen); |
| painter.setBrush(myPenColors.at(touchPoint.id() % myPenColors.count())); |
| painter.drawEllipse(rect); |
| painter.end(); |
| |
| modified = true; |
| int rad = 2; |
| update(rect.toRect().adjusted(-rad,-rad, +rad, +rad)); |
| } |
| break; |
| } |
| } |
| break; |
| } |
| default: |
| return QWidget::event(event); |
| } |
| return true; |
| } |