91 lines
2.0 KiB
C++
91 lines
2.0 KiB
C++
#include "previewwidget.h"
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#include <QPainter>
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#include <QPen>
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#include <QMouseEvent>
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#include "graphrenderer.h"
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PreviewWidget::PreviewWidget(QWidget *parent) :
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QWidget(parent)
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{
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}
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void PreviewWidget::paintEvent(QPaintEvent *event)
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{
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Q_UNUSED(event)
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if (m_graphCache.isNull() || m_graphCache.size() != size())
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{
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m_graphCache = QPixmap{size()};
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QPainter painter;
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painter.begin(&m_graphCache);
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painter.setBrush(palette().base());
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painter.drawRect(m_graphCache.rect());
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painter.setPen(QPen{palette().color(QPalette::Text)});
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painter.setBrush(palette().text());
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if (m_buffer.isValid())
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GraphRenderer::render(m_graphCache.rect(), m_buffer.constData<frame_t>(), m_buffer.constData<frame_t>() + m_buffer.frameCount(), painter);
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painter.end();
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}
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QPainter painter;
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painter.begin(this);
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painter.drawPixmap(0, 0, m_graphCache);
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if (m_buffer.frameCount())
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{
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std::size_t currentSample = double(m_position) / m_buffer.frameCount() * width();
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QPen pen(Qt::red);
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pen.setWidth(3);
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painter.setPen(pen);
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painter.drawLine(currentSample, 0, currentSample, height());
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}
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painter.end();
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}
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void PreviewWidget::mousePressEvent(QMouseEvent *event)
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{
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if (event->button() == Qt::LeftButton)
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{
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setMouseTracking(true);
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clicked(event->x(), event->y());
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}
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QWidget::mousePressEvent(event);
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}
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void PreviewWidget::mouseReleaseEvent(QMouseEvent *event)
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{
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if (event->button() == Qt::LeftButton)
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setMouseTracking(false);
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QWidget::mouseReleaseEvent(event);
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}
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void PreviewWidget::mouseMoveEvent(QMouseEvent *event)
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{
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if (event->buttons().testFlag(Qt::LeftButton))
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clicked(event->x(), event->y());
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QWidget::mouseMoveEvent(event);
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}
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void PreviewWidget::clicked(int x, int y)
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{
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if (!m_buffer.isValid())
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return;
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const auto samplesPerPixel = m_buffer.frameCount() / width();
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emit positionSelected(x * samplesPerPixel);
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}
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