262 lines
8.6 KiB
C++
262 lines
8.6 KiB
C++
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/****************************************************************************
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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 "mainwindow.h"
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#include "imagemodel.h"
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#include "pixeldelegate.h"
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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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//! [0]
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MainWindow::MainWindow()
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{
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//! [0]
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currentPath = QDir::homePath();
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model = new ImageModel(this);
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QWidget *centralWidget = new QWidget;
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//! [1]
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view = new QTableView;
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view->setShowGrid(false);
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view->horizontalHeader()->hide();
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view->verticalHeader()->hide();
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view->horizontalHeader()->setMinimumSectionSize(1);
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view->verticalHeader()->setMinimumSectionSize(1);
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view->setModel(model);
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//! [1]
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//! [2]
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PixelDelegate *delegate = new PixelDelegate(this);
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view->setItemDelegate(delegate);
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//! [2]
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//! [3]
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QLabel *pixelSizeLabel = new QLabel(tr("Pixel size:"));
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QSpinBox *pixelSizeSpinBox = new QSpinBox;
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pixelSizeSpinBox->setMinimum(4);
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pixelSizeSpinBox->setMaximum(32);
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pixelSizeSpinBox->setValue(12);
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//! [3]
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QMenu *fileMenu = new QMenu(tr("&File"), this);
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QAction *openAction = fileMenu->addAction(tr("&Open..."));
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openAction->setShortcuts(QKeySequence::Open);
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printAction = fileMenu->addAction(tr("&Print..."));
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printAction->setEnabled(false);
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printAction->setShortcut(QKeySequence::Print);
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QAction *quitAction = fileMenu->addAction(tr("E&xit"));
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quitAction->setShortcuts(QKeySequence::Quit);
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QMenu *helpMenu = new QMenu(tr("&Help"), this);
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QAction *aboutAction = helpMenu->addAction(tr("&About"));
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menuBar()->addMenu(fileMenu);
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menuBar()->addSeparator();
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menuBar()->addMenu(helpMenu);
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connect(openAction, &QAction::triggered, this, &MainWindow::chooseImage);
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connect(printAction, &QAction::triggered, this, &MainWindow::printImage);
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connect(quitAction, &QAction::triggered, qApp, &QCoreApplication::quit);
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connect(aboutAction, &QAction::triggered, this, &MainWindow::showAboutBox);
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//! [4]
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connect(pixelSizeSpinBox, QOverload<int>::of(&QSpinBox::valueChanged),
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delegate, &PixelDelegate::setPixelSize);
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connect(pixelSizeSpinBox, QOverload<int>::of(&QSpinBox::valueChanged),
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this, &MainWindow::updateView);
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//! [4]
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QHBoxLayout *controlsLayout = new QHBoxLayout;
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controlsLayout->addWidget(pixelSizeLabel);
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controlsLayout->addWidget(pixelSizeSpinBox);
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controlsLayout->addStretch(1);
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QVBoxLayout *mainLayout = new QVBoxLayout;
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mainLayout->addWidget(view);
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mainLayout->addLayout(controlsLayout);
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centralWidget->setLayout(mainLayout);
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setCentralWidget(centralWidget);
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setWindowTitle(tr("Pixelator"));
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resize(640, 480);
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//! [5]
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}
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//! [5]
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void MainWindow::chooseImage()
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{
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QString fileName = QFileDialog::getOpenFileName(this,
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tr("Choose an image"), currentPath, "*");
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if (!fileName.isEmpty())
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openImage(fileName);
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}
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void MainWindow::openImage(const QString &fileName)
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{
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QImage image;
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if (image.load(fileName)) {
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model->setImage(image);
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if (!fileName.startsWith(":/")) {
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currentPath = fileName;
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setWindowTitle(tr("%1 - Pixelator").arg(currentPath));
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}
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printAction->setEnabled(true);
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updateView();
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}
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}
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void MainWindow::printImage()
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{
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#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)
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if (model->rowCount(QModelIndex())*model->columnCount(QModelIndex()) > 90000) {
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QMessageBox::StandardButton answer;
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answer = QMessageBox::question(this, tr("Large Image Size"),
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tr("The printed image may be very large. Are you sure that "
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"you want to print it?"),
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QMessageBox::Yes | QMessageBox::No);
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if (answer == QMessageBox::No)
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return;
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}
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QPrinter printer(QPrinter::HighResolution);
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QPrintDialog dlg(&printer, this);
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dlg.setWindowTitle(tr("Print Image"));
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if (dlg.exec() != QDialog::Accepted) {
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return;
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}
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QPainter painter;
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painter.begin(&printer);
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int rows = model->rowCount(QModelIndex());
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int columns = model->columnCount(QModelIndex());
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int sourceWidth = (columns + 1) * ItemSize;
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int sourceHeight = (rows + 1) * ItemSize;
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painter.save();
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double xscale = printer.pageRect().width() / double(sourceWidth);
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double yscale = printer.pageRect().height() / double(sourceHeight);
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double scale = qMin(xscale, yscale);
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painter.translate(printer.paperRect().x() + printer.pageRect().width() / 2,
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printer.paperRect().y() + printer.pageRect().height() / 2);
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painter.scale(scale, scale);
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painter.translate(-sourceWidth / 2, -sourceHeight / 2);
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QStyleOptionViewItem option;
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QModelIndex parent = QModelIndex();
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QProgressDialog progress(tr("Printing..."), tr("Cancel"), 0, rows, this);
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progress.setWindowModality(Qt::ApplicationModal);
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float y = ItemSize / 2;
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for (int row = 0; row < rows; ++row) {
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progress.setValue(row);
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qApp->processEvents();
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if (progress.wasCanceled())
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break;
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float x = ItemSize / 2;
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for (int column = 0; column < columns; ++column) {
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option.rect = QRect(int(x), int(y), ItemSize, ItemSize);
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view->itemDelegate()->paint(&painter, option,
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model->index(row, column, parent));
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x = x + ItemSize;
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}
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y = y + ItemSize;
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}
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progress.setValue(rows);
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painter.restore();
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painter.end();
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if (progress.wasCanceled()) {
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QMessageBox::information(this, tr("Printing canceled"),
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tr("The printing process was canceled."), QMessageBox::Cancel);
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}
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#else
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QMessageBox::information(this, tr("Printing canceled"),
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tr("Printing is not supported on this Qt build"), QMessageBox::Cancel);
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#endif
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}
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void MainWindow::showAboutBox()
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{
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QMessageBox::about(this, tr("About the Pixelator example"),
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tr("This example demonstrates how a standard view and a custom\n"
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"delegate can be used to produce a specialized representation\n"
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"of data in a simple custom model."));
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}
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//! [6]
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void MainWindow::updateView()
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{
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view->resizeColumnsToContents();
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view->resizeRowsToContents();
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}
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//! [6]
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