view widgets/TipDialog.h @ 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.
*/

#ifndef _TIP_DIALOG_H_
#define _TIP_DIALOG_H_

#include <QDialog>
#include <QString>
#include <QXmlDefaultHandler>

#include <vector>

class QLabel;
class QXmlInputSource;

class TipDialog : public QDialog
{
    Q_OBJECT

public:
    TipDialog(QWidget *parent = 0, Qt::WFlags flags = 0);
    virtual ~TipDialog();

    bool isOK() { return !m_tips.empty(); }

protected slots:
    void previous();
    void next();

protected:
    int m_tipNumber;
    QLabel *m_label;
    QString m_caption;

    std::vector<QString> m_tips;

    void readTips();
    void showTip();

    class TipFileParser : public QXmlDefaultHandler
    {
    public:
        TipFileParser(TipDialog *dialog);
        virtual ~TipFileParser();
        
        void parse(QXmlInputSource &source);

        virtual bool startElement(const QString &namespaceURI,
                                  const QString &localName,
                                  const QString &qName,
                                  const QXmlAttributes& atts);
        
        virtual bool characters(const QString &);
        
        virtual bool endElement(const QString &namespaceURI,
                                const QString &localName,
                                const QString &qName);
        
        bool error(const QXmlParseException &exception);
        bool fatalError(const QXmlParseException &exception);

    protected:
        TipDialog *m_dialog;

        bool m_inTip;
        bool m_inText;
        bool m_inHtml;
    };
};

#endif