view widgets/TipDialog.cpp @ 349:369a197737c7

* Various fixes to object lifetime management, particularly in the spectrum
  layer and for notification of main model deletion.
  The main purpose of this is to improve the behaviour of the spectrum, but I
  think it may also help with #1840922 Various crashes in Layer Summary window.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2007 QMUL.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "TipDialog.h"

#include <QLabel>
#include <QPushButton>
#include <QSettings>
#include <QLabel>
#include <QLocale>
#include <QXmlInputSource>
#include <QFileInfo>
#include <QGridLayout>
#include <QGroupBox>
#include <QCheckBox>

#include <iostream>

TipDialog::TipDialog(QWidget *parent, Qt::WFlags flags) :
    QDialog(parent, flags),
    m_tipNumber(0),
    m_label(0),
    m_caption(tr("Tip of the Day"))
{
    readTips();

    QSettings settings;
    settings.beginGroup("TipOfTheDay");

    if (!settings.value("showonstartup", true).toBool()) return;

    m_tipNumber = settings.value("nexttip", 0).toInt();

    setWindowTitle(m_caption);

    QGridLayout *grid = new QGridLayout;
    setLayout(grid);
    
    QGroupBox *groupBox = new QGroupBox;
//    groupBox->setTitle(m_caption);
    grid->addWidget(groupBox, 0, 0);
    
    QGridLayout *subgrid = new QGridLayout;
    groupBox->setLayout(subgrid);

    m_label = new QLabel;
    subgrid->addWidget(m_label, 0, 0);
    m_label->setWordWrap(true);

    QHBoxLayout *hbox = new QHBoxLayout;
    grid->addLayout(hbox, 1, 0);

    QCheckBox *show = new QCheckBox(tr("Show tip on startup"));
    hbox->addWidget(show);

    hbox->addSpacing(20);
    hbox->addStretch(10);
    
    QPushButton *prev = new QPushButton(tr("<< Previous"));
    hbox->addWidget(prev);
    connect(prev, SIGNAL(clicked()), this, SLOT(previous()));
    
    QPushButton *next = new QPushButton(tr("Next >>"));
    hbox->addWidget(next);
    connect(next, SIGNAL(clicked()), this, SLOT(next()));
    
    QPushButton *close = new QPushButton(tr("Close"));
    hbox->addWidget(close);
    connect(close, SIGNAL(clicked()), this, SLOT(accept()));
    
    close->setDefault(true);

    showTip();
}

TipDialog::~TipDialog()
{
}

void
TipDialog::next()
{
    if (++m_tipNumber >= int(m_tips.size())) {
        //!!! The tips file should define where we loop back to -- the
        // first one at least is likely to be a generic welcome message
        m_tipNumber = 0;
    }

    showTip();
}

void
TipDialog::previous()
{
    if (--m_tipNumber < 0) {
        m_tipNumber = m_tips.size() - 1;
    }

    showTip();
}

void
TipDialog::readTips()
{
    std::cerr << "TipDialog::readTips" << std::endl;

    QString language = QLocale::system().name();
    QString filename = QString(":i18n/tips_%1.xml").arg(language);

    if (!QFileInfo(filename).exists()) {

        QString base = language.section('_', 0, 0);
        filename = QString(":i18n/tips_%1.xml").arg(base);

        if (!QFileInfo(filename).exists()) {

            filename = QString(":i18n/tips.xml");

            if (!QFileInfo(filename).exists()) return;
        }
    }

    QFile file(filename);

    std::cerr << "TipDialog::readTips from " << filename.toStdString() << std::endl;

    QXmlInputSource source(&file);
    
    TipFileParser parser(this);
    parser.parse(source);
}

void
TipDialog::showTip()
{
    if (m_tipNumber < int(m_tips.size())) {
        std::cerr << "Tip " << m_tipNumber << " is: " << m_tips[m_tipNumber].toStdString() << std::endl;
        m_label->setText(m_tips[m_tipNumber]);
    } else {
        accept();
    }

    int tn = m_tipNumber;
    if (++tn >= int(m_tips.size())) tn = 0; //!!! as above

    QSettings settings;
    settings.beginGroup("TipOfTheDay");
    settings.setValue("nexttip", tn);
}

TipDialog::TipFileParser::TipFileParser(TipDialog *dialog) :
    m_dialog(dialog),
    m_inTip(false),
    m_inText(false),
    m_inHtml(false)
{
}

TipDialog::TipFileParser::~TipFileParser()
{
}

void
TipDialog::TipFileParser::parse(QXmlInputSource &source)
{
    QXmlSimpleReader reader;
    reader.setContentHandler(this);
    reader.setErrorHandler(this);
    reader.parse(source);
}

bool
TipDialog::TipFileParser::startElement(const QString &, const QString &,
                                       const QString &qName,
                                       const QXmlAttributes &attributes)
{
    QString name = qName.toLower();

    std::cerr << "TipFileParser::startElement(" << name.toStdString() << ")" << std::endl;

    if (name == "tips") {
        QString caption = attributes.value("caption");
        std::cerr << "TipFileParser::caption = " << caption.toStdString() << std::endl;
        if (caption != "") m_dialog->m_caption = caption;
    } else if (name == "tip") {
        if (m_inTip) {
            std::cerr << "WARNING: TipFileParser: nested <tip> elements" << std::endl;
        }
        m_inTip = true;
    } else if (name == "text") {
        if (m_inTip) {
            m_inText = true;
            std::cerr << "TipFileParser: adding new tip" << std::endl;
            m_dialog->m_tips.push_back("");
        } else {
            std::cerr << "WARNING: TipFileParser: <text> outside <tip> element" << std::endl;
        }
    } else if (name == "html") {
        if (m_inTip) {
            m_inHtml = true;
            std::cerr << "TipFileParser: adding new tip" << std::endl;
            m_dialog->m_tips.push_back("");
        } else {
            std::cerr << "WARNING: TipFileParser: <html> outside <tip> element" << std::endl;
        }
    } else if (m_inHtml) {
        m_dialog->m_tips[m_dialog->m_tips.size()-1] += "<" + qName;
        for (int i = 0; i < attributes.count(); ++i) {
            m_dialog->m_tips[m_dialog->m_tips.size()-1] += 
                " " + attributes.qName(i) + "=\"" + attributes.value(i) + "\"";
        }
        m_dialog->m_tips[m_dialog->m_tips.size()-1] += ">";
    }
    
    std::cerr << "TipFileParser::startElement done" << std::endl;
    return true;
}

bool
TipDialog::TipFileParser::endElement(const QString &, const QString &,
                                     const QString &qName)
{
    QString name = qName.toLower();

    if (name == "text") {
        if (!m_inText) {
            std::cerr << "WARNING: TipFileParser: </text> without <text>" << std::endl;
        }
        m_inText = false;
    } else if (name == "html") {
        if (!m_inHtml) {
            std::cerr << "WARNING: TipFileParser: </html> without <html>" << std::endl;
        }
        m_inHtml = false;
    } else if (name == "tip") {
        if (m_inText) {
            std::cerr << "WARNING: TipFileParser: <text> without </text>" << std::endl;
        } else if (m_inHtml) {
            std::cerr << "WARNING: TipFileParser: <html> without </html>" << std::endl;
        } else if (!m_inTip) {
            std::cerr << "WARNING: TipFileParser: </tip> without <tip>" << std::endl;
        }
        m_inTip = false;
    } else if (m_inHtml) {
        m_dialog->m_tips[m_dialog->m_tips.size()-1] += "</" + qName + ">";
    }

    return true;
}

bool
TipDialog::TipFileParser::characters(const QString &text)
{
    std::cerr << "TipFileParser::characters(" << text.toStdString() << ")" << std::endl;

    if (m_inText || m_inHtml) {
        m_dialog->m_tips[m_dialog->m_tips.size()-1] += text;
    }

    return true;
}

bool
TipDialog::TipFileParser::error(const QXmlParseException &exception)
{
    QString errorString =
	QString("ERROR: TipFileParser: %1 at line %2, column %3")
	.arg(exception.message())
	.arg(exception.lineNumber())
	.arg(exception.columnNumber());
    std::cerr << errorString.toStdString() << std::endl;
    return QXmlDefaultHandler::error(exception);
}

bool
TipDialog::TipFileParser::fatalError(const QXmlParseException &exception)
{
    QString errorString =
	QString("FATAL ERROR: TipFileParser: %1 at line %2, column %3")
	.arg(exception.message())
	.arg(exception.lineNumber())
	.arg(exception.columnNumber());
    std::cerr << errorString.toStdString() << std::endl;
    return QXmlDefaultHandler::fatalError(exception);
}