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This example demonstrates how to use QtMmlWidget. It allows the user to browse MML files, displaying their content. If a directory contains an MML file and a PNG image with the same name, the image is assumed to be a reference of how the MML file should be rendered, and is also displayed. The complete sources may be found in the example directory. The most rellevant files are shown below.
<hr> mainwindow.h:
/**************************************************************************** ** ** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation ([email protected]) ** ** This file is part of a Qt Solutions component. ** ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Solutions Commercial License Agreement provided ** with the Software or, alternatively, in accordance with the terms ** contained in a written agreement between you and Nokia. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain ** additional rights. These rights are described in the Nokia Qt LGPL ** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this ** package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** Please note Third Party Software included with Qt Solutions may impose ** additional restrictions and it is the user's responsibility to ensure ** that they have met the licensing requirements of the GPL, LGPL, or Qt ** Solutions Commercial license and the relevant license of the Third ** Party Software they are using. ** ** If you are unsure which license is appropriate for your use, please ** contact Nokia at [email protected]. ** ****************************************************************************/ #ifndef MAIN_WINDOW_H #define MAIN_WINDOW_H #include <QtGui/QMainWindow> //Added by qt3to4: #include <QtGui/QLabel> class QtMmlWidget; class QLabel; class FileBrowser; class MainWindow : public QMainWindow { Q_OBJECT public: MainWindow(QWidget *parent = 0); public slots: void zoomIn(); void zoomOut(); void toggleDrawFrames(); void openFile(const QString &mml_file_name); private: QtMmlWidget *m_mml_widget; QLabel *m_compare_image; FileBrowser *m_file_browser; }; void showWarning(const QString &msg); #endif
<hr> mainwindow.cpp:
/**************************************************************************** ** ** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation ([email protected]) ** ** This file is part of a Qt Solutions component. ** ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Solutions Commercial License Agreement provided ** with the Software or, alternatively, in accordance with the terms ** contained in a written agreement between you and Nokia. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain ** additional rights. These rights are described in the Nokia Qt LGPL ** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this ** package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** Please note Third Party Software included with Qt Solutions may impose ** additional restrictions and it is the user's responsibility to ensure ** that they have met the licensing requirements of the GPL, LGPL, or Qt ** Solutions Commercial license and the relevant license of the Third ** Party Software they are using. ** ** If you are unsure which license is appropriate for your use, please ** contact Nokia at [email protected]. ** ****************************************************************************/ #include <stdlib.h> #include <errno.h> #include <QtCore/QFile> #include <QtCore/QTextStream> #include <QtGui/QLabel> #include <QtGui/QLayout> #include <QtGui/QPixmap> #include <QtGui/QToolButton> #include <QtGui/QToolBar> #include <QtGui/QSplitter> #include <QtGui/QMessageBox> #include <qtmmlwidget.h> #include <QtGui/QVBoxLayout> #include "mainwindow.h" #include "filebrowser.h" void showWarning(const QString &msg) { QMessageBox::warning(0, "Warning", msg, QMessageBox::Ok, QMessageBox::NoButton, QMessageBox::NoButton); } MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { setWindowTitle("MathML Browser"); QSplitter *splitter = new QSplitter(this); splitter->setChildrenCollapsible(false); m_file_browser = new FileBrowser("*.mml", splitter); QWidget *formula_widget = new QWidget(splitter); QVBoxLayout *layout = new QVBoxLayout; layout->setSpacing(2); layout->setMargin(2); m_mml_widget = new QtMmlWidget(formula_widget); layout->addWidget(m_mml_widget); m_mml_widget->setBackgroundRole(QPalette::Base); m_compare_image = new QLabel; layout->addWidget(m_compare_image); m_compare_image->setAlignment(Qt::AlignCenter); m_compare_image->setBackgroundRole(QPalette::Base); formula_widget->setLayout(layout); setCentralWidget(splitter); QToolBar *tool_bar = new QToolBar(this); tool_bar->addAction(QIcon(":/images/zoom_in.png"), "Zoom in", this, SLOT(zoomIn())); tool_bar->addAction(QIcon(":/images/zoom_out.png"), "Zoom out", this, SLOT(zoomOut())); tool_bar->addAction(QIcon(":/images/frames.png"), "Toggle frames", this, SLOT(toggleDrawFrames())); addToolBar(tool_bar); connect(m_file_browser, SIGNAL(fileSelected(const QString &)), this, SLOT(openFile(const QString &))); } void MainWindow::zoomIn() { m_mml_widget->setBaseFontPointSize(m_mml_widget->baseFontPointSize() + 2); } void MainWindow::zoomOut() { m_mml_widget->setBaseFontPointSize(m_mml_widget->baseFontPointSize() - 2); } void MainWindow::toggleDrawFrames() { m_mml_widget->setDrawFrames(!m_mml_widget->drawFrames()); } void MainWindow::openFile(const QString &mml_file_name) { m_mml_widget->clear(); m_compare_image->clear(); QFile file(mml_file_name); if (!file.open(QIODevice::ReadOnly)) { showWarning("File error: Could not open \"" + mml_file_name + "\": " + file.errorString()); return; } QTextStream stream(&file); // stream.setEncoding(QTextStream::UnicodeUTF8); QString text = stream.readAll(); file.close(); QString error_msg; int error_line, error_column; bool result = m_mml_widget->setContent(text, &error_msg, &error_line, &error_column); if (!result) { showWarning("Parse error: line " + QString::number(error_line) + ", col " + QString::number(error_column) + ": " + error_msg); return; } QPixmap pm; int idx = mml_file_name.lastIndexOf('.'); if (idx != -1) { QString image_file_name = mml_file_name.mid(0, idx + 1) + "png"; if (pm.load(image_file_name)) m_compare_image->setPixmap(pm); } }
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