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#include "sequentialpagewidget.h"
#include <QPaintEvent>
#include <QPainter>
#include <QPdfDocument>
#include <QGuiApplication>
#include <QScreen>
#include <QLoggingCategory>
Q_DECLARE_LOGGING_CATEGORY(lcExample)
SequentialPageWidget::SequentialPageWidget(QWidget *parent)
: QWidget(parent)
, m_doc(Q_NULLPTR)
, m_background(Qt::darkGray)
, m_pageSpacing(3)
, m_zoom(1.)
, m_top(0.)
, m_screenResolution(QGuiApplication::primaryScreen()->logicalDotsPerInch() / 72.0)
{
}
SequentialPageWidget::~SequentialPageWidget()
{
}
void SequentialPageWidget::setDocument(QPdfDocument *doc)
{
m_doc = doc;
}
void SequentialPageWidget::setZoom(qreal factor)
{
m_zoom = factor;
m_pageCache.clear();
update();
}
void SequentialPageWidget::paintEvent(QPaintEvent * event)
{
QPainter painter(this);
if (!m_doc) {
painter.drawText(rect(), Qt::AlignCenter, tr("no document loaded"));
return;
}
painter.fillRect(event->rect(), m_background);
qCDebug(lcExample) << event->rect() << m_doc->pageCount();
int page = 0; // qFloor(m_top);
int y = 0; // TODO event->rect().top();
while (y < event->rect().bottom() && page < m_doc->pageCount()) {
QSizeF size = m_doc->pageSize(page) * m_screenResolution * m_zoom;
if (!m_pageCache.contains(page)) {
qCDebug(lcExample) << "rendering page" << page << "to size" << size;
m_pageCache.insert(page, QPixmap::fromImage(m_doc->render(page, size)));
}
const QPixmap &pm = m_pageCache[page];
painter.drawPixmap(0, y, pm);
y += pm.height() + m_pageSpacing;
++page;
}
}
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