view widgets/ProgressDialog.cpp @ 959:2633a1d73e39

Address #1214, layer import produces wrong layer type. We needed a more principled approach to making sure the format gets updated properly and the dialog elements are consistent (basically separating making the dialog elements consistent from subsequently updating the format). This change should provide that, though there may be gotchas still.

/* -*- 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 2007-2008 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 "ProgressDialog.h"

#include <QProgressDialog>
#include <QApplication>
#include <QTimer>

ProgressDialog::ProgressDialog(QString message, bool cancellable,
                               int timeBeforeShow, QWidget *parent) : 
    m_showTimer(0),
    m_timerElapsed(false),
    m_cancelled(false)
{
    m_dialog = new QProgressDialog(message, cancellable ? tr("Cancel") : 0,
                                   0, 100, parent);
    if (timeBeforeShow > 0) {
        m_dialog->hide();
        m_showTimer = new QTimer;
        connect(m_showTimer, SIGNAL(timeout()), this, SLOT(showTimerElapsed()));
        m_showTimer->setSingleShot(true);
        m_showTimer->start(timeBeforeShow);
    } else {
        m_dialog->show();
        m_dialog->raise();
        m_timerElapsed = true;
    }

    if (cancellable) {
        connect(m_dialog, SIGNAL(canceled()), this, SLOT(canceled()));
    }
}

ProgressDialog::~ProgressDialog()
{
    delete m_showTimer;
    delete m_dialog;
}

bool
ProgressDialog::isDefinite() const
{
    return (m_dialog->maximum() > 0);
}

void
ProgressDialog::setDefinite(bool definite)
{
    if (definite) m_dialog->setMaximum(100);
    else m_dialog->setMaximum(0);
}

void
ProgressDialog::setMessage(QString text)
{
    m_dialog->setLabelText(text);
}

void
ProgressDialog::canceled()
{
    m_cancelled = true;
    emit cancelled();
}

bool
ProgressDialog::wasCancelled() const
{
    return m_cancelled;
}

void
ProgressDialog::showTimerElapsed()
{
    m_timerElapsed = true;
    if (m_dialog->value() > 0) {
        emit showing();
        m_dialog->show();
    }
    qApp->processEvents();
}

void
ProgressDialog::setProgress(int percentage)
{
    if (percentage > m_dialog->value()) {

        m_dialog->setValue(percentage);

        if (percentage >= 100 && isDefinite()) {
            m_dialog->hide();
        } else if (m_timerElapsed && !m_dialog->isVisible()) {
            emit showing();
            m_dialog->show();
            m_dialog->raise();
        }

        qApp->processEvents();
    }
}