1 files changed, 63 insertions, 0 deletions
diff --git a/examples/widgets/pdfviewer/sequentialpagewidget.cpp b/examples/widgets/pdfviewer/sequentialpagewidget.cpp
new file mode 100644
index 0000000..5de4f2e
--- /dev/null
+++ b/examples/widgets/pdfviewer/sequentialpagewidget.cpp
@@ -0,0 +1,63 @@
+#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;
+    }
+}