mainwindow.cpp Example File | Qt SVG 5.5

- Qt 5.5
- Qt SVG
- SVG Viewer Example
- mainwindow.cpp Example File
- Qt 5.5.1 Reference Documentation

# mainwindow.cpp Example File

svgviewer/mainwindow.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
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    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    **
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    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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    #include "mainwindow.h"

    #include <QtWidgets>

    #include "svgview.h"

    MainWindow::MainWindow()
        : QMainWindow()
        , m_view(new SvgView)
    {
        QMenu *fileMenu = new QMenu(tr("&File"), this);
        QAction *openAction = fileMenu->addAction(tr("&Open..."));
        openAction->setShortcut(QKeySequence(tr("Ctrl+O")));
        QAction *quitAction = fileMenu->addAction(tr("E&xit"));
        quitAction->setShortcuts(QKeySequence::Quit);

        menuBar()->addMenu(fileMenu);

        QMenu *viewMenu = new QMenu(tr("&View"), this);
        m_backgroundAction = viewMenu->addAction(tr("&Background"));
        m_backgroundAction->setEnabled(false);
        m_backgroundAction->setCheckable(true);
        m_backgroundAction->setChecked(false);
        connect(m_backgroundAction, SIGNAL(toggled(bool)), m_view, SLOT(setViewBackground(bool)));

        m_outlineAction = viewMenu->addAction(tr("&Outline"));
        m_outlineAction->setEnabled(false);
        m_outlineAction->setCheckable(true);
        m_outlineAction->setChecked(true);
        connect(m_outlineAction, SIGNAL(toggled(bool)), m_view, SLOT(setViewOutline(bool)));

        menuBar()->addMenu(viewMenu);

        QMenu *rendererMenu = new QMenu(tr("&Renderer"), this);
        m_nativeAction = rendererMenu->addAction(tr("&Native"));
        m_nativeAction->setCheckable(true);
        m_nativeAction->setChecked(true);
    #ifndef QT_NO_OPENGL
        m_glAction = rendererMenu->addAction(tr("&OpenGL"));
        m_glAction->setCheckable(true);
    #endif
        m_imageAction = rendererMenu->addAction(tr("&Image"));
        m_imageAction->setCheckable(true);

    #ifndef QT_NO_OPENGL
        rendererMenu->addSeparator();
        m_highQualityAntialiasingAction = rendererMenu->addAction(tr("&High Quality Antialiasing"));
        m_highQualityAntialiasingAction->setEnabled(false);
        m_highQualityAntialiasingAction->setCheckable(true);
        m_highQualityAntialiasingAction->setChecked(false);
        connect(m_highQualityAntialiasingAction, SIGNAL(toggled(bool)), m_view, SLOT(setHighQualityAntialiasing(bool)));
    #endif

        QActionGroup *rendererGroup = new QActionGroup(this);
        rendererGroup->addAction(m_nativeAction);
    #ifndef QT_NO_OPENGL
        rendererGroup->addAction(m_glAction);
    #endif
        rendererGroup->addAction(m_imageAction);

        menuBar()->addMenu(rendererMenu);

        connect(openAction, SIGNAL(triggered()), this, SLOT(openFile()));
        connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
        connect(rendererGroup, SIGNAL(triggered(QAction*)),
                this, SLOT(setRenderer(QAction*)));

        setCentralWidget(m_view);
        setWindowTitle(tr("SVG Viewer"));
    }

    void MainWindow::openFile(const QString &path)
    {
        QString fileName;
        if (path.isNull())
            fileName = QFileDialog::getOpenFileName(this, tr("Open SVG File"),
                    m_currentPath, "SVG files (*.svg *.svgz *.svg.gz)");
        else
            fileName = path;

        if (!fileName.isEmpty()) {
            QFile file(fileName);
            if (!file.exists()) {
                QMessageBox::critical(this, tr("Open SVG File"),
                               QString("Could not open file '%1'.").arg(fileName));

                m_outlineAction->setEnabled(false);
                m_backgroundAction->setEnabled(false);
                return;
            }

            m_view->openFile(file);

            if (!fileName.startsWith(":/")) {
                m_currentPath = fileName;
                setWindowTitle(tr("%1 - SVGViewer").arg(m_currentPath));
            }

            m_outlineAction->setEnabled(true);
            m_backgroundAction->setEnabled(true);

            resize(m_view->sizeHint() + QSize(80, 80 + menuBar()->height()));
        }
    }

    void MainWindow::setRenderer(QAction *action)
    {
    #ifndef QT_NO_OPENGL
        m_highQualityAntialiasingAction->setEnabled(false);
    #endif

        if (action == m_nativeAction)
            m_view->setRenderer(SvgView::Native);
    #ifndef QT_NO_OPENGL
        else if (action == m_glAction) {
            m_highQualityAntialiasingAction->setEnabled(true);
            m_view->setRenderer(SvgView::OpenGL);
        }
    #endif
        else if (action == m_imageAction) {
            m_view->setRenderer(SvgView::Image);
        }
    }