view widgets/ImageDialog.cpp @ 1127:9fb8dfd7ce4c spectrogram-minor-refactor

Fix threshold in spectrogram -- it wasn't working in the last release.
There is a new protocol for this. Formerly the threshold parameter had a
range from -50dB to 0 with the default at -50, and -50 treated internally
as "no threshold". However, there was a hardcoded, hidden internal threshold
for spectrogram colour mapping at -80dB with anything below this being rounded
to zero. Now the threshold parameter has range -81 to -1 with the default
at -80, -81 is treated internally as "no threshold", and there is no hidden
internal threshold. So the default behaviour is the same as before, an
effective -80dB threshold, but it is now possible to change this in both
directions. Sessions reloaded from prior versions may look slightly different
because, if the session says there should be no threshold, there will now
actually be no threshold instead of having the hidden internal one.

Still need to do something in the UI to make it apparent that the -81dB
setting removes the threshold entirely. This is at least no worse than the
previous, also obscured, magic -50dB setting.

/* -*- 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 "ImageDialog.h"

#include <QLineEdit>
#include <QGridLayout>
#include <QLabel>
#include <QDialogButtonBox>
#include <QPushButton>
#include <QGroupBox>
#include <QDesktopWidget>
#include <QApplication>
#include <QUrl>
#include <QMessageBox>

#include "ProgressDialog.h"

#include "data/fileio/FileSource.h"
#include "InteractiveFileFinder.h"

#include <iostream>

ImageDialog::ImageDialog(QString title,
                         QString image,
                         QString label,
                         QWidget *parent) :
    QDialog(parent),
    m_imagePreview(0),
    m_remoteFile(0)
{
    setWindowTitle(title);
    
    QGridLayout *grid = new QGridLayout;
    setLayout(grid);

    QGroupBox *databox = new QGroupBox(tr("Image"));

    QGridLayout *subgrid = new QGridLayout;
    databox->setLayout(subgrid);

    int row = 0;

    subgrid->addWidget(new QLabel(tr("Label:")), row, 0);

    m_labelEdit = new QLineEdit;
    subgrid->addWidget(m_labelEdit, row, 1, 1, 2);

    ++row;

    subgrid->addWidget(new QLabel(tr("File or URL:")), row, 0);

    m_imageEdit = new QLineEdit;
    subgrid->addWidget(m_imageEdit, row, 1, 1, 1);

    connect(m_imageEdit, SIGNAL(textEdited(const QString &)),
            this, SLOT(imageEditEdited(const QString &)));
    connect(m_imageEdit, SIGNAL(editingFinished()),
            this, SLOT(imageEditEdited()));

    QPushButton *browse = new QPushButton(tr("Browse..."));
    connect(browse, SIGNAL(clicked()), this, SLOT(browseClicked()));
    subgrid->addWidget(browse, row, 2, 1, 1);

    ++row;

    QGroupBox *previewbox = new QGroupBox(tr("Preview"));
    
    subgrid = new QGridLayout;
    previewbox->setLayout(subgrid);

    m_imagePreview = new QLabel;
    m_imagePreview->setAlignment(Qt::AlignCenter);
    subgrid->addWidget(m_imagePreview, 0, 0);

    m_imagePreview->setMinimumSize(QSize(100, 100));

    QDesktopWidget *desktop = QApplication::desktop();
    m_imagePreview->setMaximumSize(QSize((desktop->width() * 2) / 3,
                                         (desktop->height() * 2) / 3));

    grid->addWidget(databox, 0, 0);
    grid->addWidget(previewbox, 1, 0);

    grid->setRowStretch(1, 10);

    QDialogButtonBox *bb = new QDialogButtonBox(QDialogButtonBox::Ok |
                                                QDialogButtonBox::Cancel);
    grid->addWidget(bb, 2, 0, 1, 1);
    connect(bb, SIGNAL(accepted()), this, SLOT(accept()));
    connect(bb, SIGNAL(rejected()), this, SLOT(reject()));

    m_okButton = bb->button(QDialogButtonBox::Ok);
    m_okButton->setEnabled(false);

    if (image != "") setImage(image);
    if (label != "") setLabel(label);
}

ImageDialog::~ImageDialog()
{
    delete m_remoteFile;
}

QString
ImageDialog::getImage()
{
    return m_loadedImageFile;
}

QPixmap
ImageDialog::getPixmap()
{
    return m_loadedImage;
}

QString
ImageDialog::getLabel()
{
    return m_labelEdit->text();
}

void
ImageDialog::setImage(QString image)
{
    m_imageEdit->setText(image);
    updatePreview();
}

void
ImageDialog::setLabel(QString label)
{
    m_labelEdit->setText(label);
}

void
ImageDialog::resizeEvent(QResizeEvent *)
{
    updatePreview();
}

void
ImageDialog::imageEditEdited(const QString &s)
{
    if (s.startsWith("http:") || s.startsWith("ftp:")) {
        return;
    }
    updatePreview();
}

void
ImageDialog::imageEditEdited()
{
    updatePreview();
}

void
ImageDialog::updatePreview()
{
    if (!m_imagePreview) return;

    QString img = m_imageEdit->text();

    m_okButton->setEnabled(img != "");

    if (img != m_loadedImageFile) {

        QString fileName = img;
        delete m_remoteFile;
        m_remoteFile = 0;

        if (FileSource::isRemote(fileName)) {
            QUrl url(fileName);
            if (!FileSource::canHandleScheme(url)) {
                QMessageBox::critical(this, tr("Unsupported scheme in URL"),
                                      tr("The URL scheme \"%1\" is not supported")
                                      .arg(url.scheme()));
            } else {
                
                ProgressDialog dialog(tr("Opening image URL..."), true, 2000);
                m_remoteFile = new FileSource(url, &dialog);
                m_remoteFile->waitForData();
                if (!m_remoteFile->isOK()) {
                    QMessageBox::critical(this, tr("File download failed"),
                                          tr("Failed to download URL \"%1\": %2")
                                          .arg(url.toString()).arg(m_remoteFile->getErrorString()));
                    delete m_remoteFile;
                    m_remoteFile = 0;
                } else {
                    fileName = m_remoteFile->getLocalFilename();
                }
            }
        }
        
//        cerr << "image filename: \"" << fileName << "\"" << endl;

        m_loadedImage = QPixmap(fileName);
        m_loadedImageFile = img;
    }

    QSize sz(m_imagePreview->size());
    int m = m_imagePreview->margin() * 2;
    sz -= QSize(m, m);

    if (m_loadedImage.isNull()) {
        m_imagePreview->setPixmap(QPixmap());
    } else {
        m_imagePreview->setPixmap(m_loadedImage.scaled
                                  (sz,
                                   Qt::KeepAspectRatio,
                                   Qt::SmoothTransformation));
    }
}

void
ImageDialog::browseClicked()
{
    QString file =
        InteractiveFileFinder::getInstance()->getOpenFileName(FileFinder::ImageFile);

    if (file != "") {
        setImage(file);
        emit imageChanged(file);
    }
}