inspectrum/mainwindow.cpp

#include <QtWidgets>

#include "mainwindow.h"

MainWindow::MainWindow()
{
    setWindowTitle(tr("inspectrum"));
    scrollArea.setWidget(&spectrogram);
    scrollArea.viewport()->installEventFilter(this);
    setCentralWidget(&scrollArea);

    dock = new SpectrogramControls(tr("Controls"), this);
    dock->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
    addDockWidget(Qt::LeftDockWidgetArea, dock);

    connect(dock, SIGNAL(openFile(QString)), &spectrogram, SLOT(openFile(QString)));
    connect(dock->sampleRate, SIGNAL(textChanged(QString)), this, SLOT(setSampleRate(QString)));
    connect(dock, SIGNAL(fftSizeChanged(int)), this, SLOT(setFFTSize(int)));
    connect(dock->zoomLevelSlider, SIGNAL(valueChanged(int)), this, SLOT(setZoomLevel(int)));
    connect(dock->powerMaxSlider, SIGNAL(valueChanged(int)), &spectrogram, SLOT(setPowerMax(int)));
    connect(dock->powerMinSlider, SIGNAL(valueChanged(int)), &spectrogram, SLOT(setPowerMin(int)));
}

bool MainWindow::eventFilter(QObject * /*obj*/, QEvent *event)
{
    if (event->type() == QEvent::Wheel) {
        QWheelEvent *wheelEvent = (QWheelEvent*)event;
        QSlider *slider = nullptr;
        if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
            slider = dock->zoomLevelSlider;
        } else if (QApplication::keyboardModifiers() & Qt::ShiftModifier) {
            slider = dock->fftSizeSlider;
        }
        if (slider != nullptr) {
            if (wheelEvent->angleDelta().y() > 0) {
                slider->setValue(slider->value() + 1);
            } else if (wheelEvent->angleDelta().y() < 0) {
                slider->setValue(slider->value() - 1);
            }
            return true;
        }
    }
    return false;
}

void MainWindow::setSampleRate(QString rate)
{
    spectrogram.setSampleRate(rate.toInt());
}

void MainWindow::setFFTSize(int size)
{
    off_t sample = getCenterSample();
    spectrogram.setFFTSize(size);
    scrollArea.verticalScrollBar()->setValue(getScrollPos(sample));
}

void MainWindow::setZoomLevel(int zoom)
{
    off_t sample = getCenterSample();
    spectrogram.setZoomLevel(zoom);
    scrollArea.verticalScrollBar()->setValue(getScrollPos(sample));
}

off_t MainWindow::getCenterSample()
{
    int height = scrollArea.height();
    return (scrollArea.verticalScrollBar()->value() + height / 2) * spectrogram.getStride();
}

int MainWindow::getScrollPos(off_t sample)
{
    int height = scrollArea.height();
    return sample / spectrogram.getStride() - height / 2;
}