1f2c23a7ca
Cleanup the Widget examples - replace foreach with range-based for loop in subdirectory tools, touch and tutorials Change-Id: I008d23b5993a18a3332fe9f5e5bca68cb0561066 Reviewed-by: Luca Beldi <v.ronin@yahoo.it> Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com> Reviewed-by: Paul Wicking <paul.wicking@qt.io>
236 lines
7.2 KiB
C++
236 lines
7.2 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtWidgets>
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#if defined(QT_PRINTSUPPORT_LIB)
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#include <QtPrintSupport/qtprintsupportglobal.h>
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#if QT_CONFIG(printdialog)
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#include <QPrinter>
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#include <QPrintDialog>
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#endif
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#endif
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#include "scribblearea.h"
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static const qreal MinimumDiameter = 3.0;
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static const qreal MaximumDiameter = 50.0;
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//! [0]
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ScribbleArea::ScribbleArea(QWidget *parent)
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: QWidget(parent)
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{
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setAttribute(Qt::WA_AcceptTouchEvents);
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setAttribute(Qt::WA_StaticContents);
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modified = false;
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myPenColors
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<< QColor("green")
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<< QColor("purple")
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<< QColor("red")
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<< QColor("blue")
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<< QColor("yellow")
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<< QColor("pink")
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<< QColor("orange")
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<< QColor("brown")
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<< QColor("grey")
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<< QColor("black");
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}
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//! [0]
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//! [1]
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bool ScribbleArea::openImage(const QString &fileName)
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//! [1] //! [2]
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{
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QImage loadedImage;
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if (!loadedImage.load(fileName))
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return false;
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QSize newSize = loadedImage.size().expandedTo(size());
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resizeImage(&loadedImage, newSize);
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image = loadedImage;
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modified = false;
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update();
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return true;
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}
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//! [2]
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//! [3]
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bool ScribbleArea::saveImage(const QString &fileName, const char *fileFormat)
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//! [3] //! [4]
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{
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QImage visibleImage = image;
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resizeImage(&visibleImage, size());
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if (visibleImage.save(fileName, fileFormat)) {
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modified = false;
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return true;
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} else {
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return false;
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}
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}
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//! [4]
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//! [9]
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void ScribbleArea::clearImage()
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//! [9] //! [10]
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{
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image.fill(qRgb(255, 255, 255));
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modified = true;
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update();
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}
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//! [10]
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//! [12] //! [13]
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void ScribbleArea::paintEvent(QPaintEvent *event)
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//! [13] //! [14]
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{
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QPainter painter(this);
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const QRect rect = event->rect();
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painter.drawImage(rect.topLeft(), image, rect);
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}
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//! [14]
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//! [15]
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void ScribbleArea::resizeEvent(QResizeEvent *event)
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//! [15] //! [16]
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{
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if (width() > image.width() || height() > image.height()) {
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int newWidth = qMax(width() + 128, image.width());
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int newHeight = qMax(height() + 128, image.height());
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resizeImage(&image, QSize(newWidth, newHeight));
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update();
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}
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QWidget::resizeEvent(event);
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}
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//! [16]
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//! [19]
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void ScribbleArea::resizeImage(QImage *image, const QSize &newSize)
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//! [19] //! [20]
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{
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if (image->size() == newSize)
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return;
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QImage newImage(newSize, QImage::Format_RGB32);
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newImage.fill(qRgb(255, 255, 255));
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QPainter painter(&newImage);
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painter.drawImage(QPoint(0, 0), *image);
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*image = newImage;
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}
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//! [20]
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//! [21]
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void ScribbleArea::print()
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{
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#if QT_CONFIG(printdialog)
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QPrinter printer(QPrinter::HighResolution);
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QPrintDialog printDialog(&printer, this);
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//! [21] //! [22]
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if (printDialog.exec() == QDialog::Accepted) {
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QPainter painter(&printer);
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QRect rect = painter.viewport();
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QSize size = image.size();
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size.scale(rect.size(), Qt::KeepAspectRatio);
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painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
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painter.setWindow(image.rect());
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painter.drawImage(0, 0, image);
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}
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#endif // QT_CONFIG(printdialog)
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}
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//! [22]
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bool ScribbleArea::event(QEvent *event)
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{
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switch (event->type()) {
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case QEvent::TouchBegin:
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case QEvent::TouchUpdate:
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case QEvent::TouchEnd:
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{
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const QTouchEvent *touch = static_cast<QTouchEvent *>(event);
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const QList<QTouchEvent::TouchPoint> touchPoints = static_cast<QTouchEvent *>(event)->touchPoints();
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for (const QTouchEvent::TouchPoint &touchPoint : touchPoints) {
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switch (touchPoint.state()) {
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case Qt::TouchPointStationary:
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case Qt::TouchPointReleased:
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// don't do anything if this touch point hasn't moved or has been released
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continue;
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default:
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{
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QRectF rect = touchPoint.rect();
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if (rect.isEmpty()) {
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qreal diameter = MaximumDiameter;
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if (touch->device()->capabilities() & QTouchDevice::Pressure)
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diameter = MinimumDiameter + (MaximumDiameter - MinimumDiameter) * touchPoint.pressure();
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rect.setSize(QSizeF(diameter, diameter));
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}
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QPainter painter(&image);
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painter.setPen(Qt::NoPen);
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painter.setBrush(myPenColors.at(touchPoint.id() % myPenColors.count()));
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painter.drawEllipse(rect);
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painter.end();
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modified = true;
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int rad = 2;
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update(rect.toRect().adjusted(-rad,-rad, +rad, +rad));
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}
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break;
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}
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}
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break;
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}
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default:
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return QWidget::event(event);
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}
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return true;
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}
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