animatedsmile.cpp

用qt4 编写的局域网聊天工具

/***************************************************************************
 *   Copyright (C) 2007 by Anistratov Oleg                                 *
 *   [e-mail]                                                      *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License version 2        *
 *   as published by the Free Software Foundation;                         *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 ***************************************************************************/
#include "animatedsmile.h"

#include <QUrl>
#include <QFile>
#include <QCryptographicHash>

QMap<QByteArray, QMovie*> AnimatedSmile::m_allSmiles;

AnimatedSmile::AnimatedSmile(QObject *parent)
 : QObject(parent),
  m_smile(NULL),
  m_document(NULL),
  m_running(false)
{
}

AnimatedSmile::~AnimatedSmile()
{
  disconnect(m_smile, SIGNAL(frameChanged(int)), this, SLOT(nextFrame()));
}

void AnimatedSmile::init(int pos, const QString& smile, QTextDocument* doc)
{
  Q_ASSERT(!m_cursor && !m_smile);

  QFile file(smile);
  QCryptographicHash hash(QCryptographicHash::Md5);
  QByteArray result;

  if(!file.open(QIODevice::ReadOnly))
    return;

  hash.addData(file.readAll());

  result = hash.result();

  m_smile = m_allSmiles[result];

  if(!m_smile)
  {
    m_smile = new QMovie(smile);
    m_allSmiles.insert(result, m_smile);
  }

  m_filename = smile;
  m_document = doc;
  m_pos      = pos;

  connect(m_smile, SIGNAL(frameChanged(int)), this, SLOT(nextFrame()));
}

void AnimatedSmile::nextFrame()
{
  if(m_running && m_smile && m_document)
  {
    QTextCursor cur(m_document);

    m_document->addResource(QTextDocument::ImageResource, QUrl(m_filename), m_smile->currentImage());

    cur.setPosition(m_pos);
    cur.movePosition(QTextCursor::NextCharacter, QTextCursor::KeepAnchor);

    cur.insertImage(m_filename);
  }
}

void AnimatedSmile::pauseIfHidden(int min, int max)
{
  setPaused(!(m_pos >= min && m_pos <= max));
}