1 files changed, 46 insertions, 0 deletions
diff --git a/examples/widgets/pdfviewer/pagecache.h b/examples/widgets/pdfviewer/pagecache.h
new file mode 100644
index 0000000..49d8bf8
--- /dev/null
+++ b/examples/widgets/pdfviewer/pagecache.h
@@ -0,0 +1,46 @@
+#ifndef PAGECACHE_H
+#define PAGECACHE_H
+
+#include <QBrush>
+#include <QHash>
+#include <QPixmap>
+#include <QRunnable>
+
+class QPdfDocument;
+
+class PageCache : public QObject
+{
+    Q_OBJECT
+public:
+    PageCache(QPdfDocument *doc, qreal zoom);
+    ~PageCache();
+
+    QPixmap get(int page);
+
+public slots:
+    void run();
+
+signals:
+    void pagesNeeded();
+    void pageReady(int page);
+
+private:
+    void insertPage(int page);
+
+private:
+    QThread *m_thread;
+    QPdfDocument *m_doc;
+    QHash<int, QPixmap> m_pageCache;
+    qreal m_zoom;
+    int m_lastPageRequested;
+    QPixmap m_placeholderIcon;
+    QBrush m_placeholderBackground;
+
+    // performance statistics
+    qreal m_minRenderTime;
+    qreal m_maxRenderTime;
+    qreal m_totalRenderTime;
+    int m_totalPagesRendered;
+};
+
+#endif // PAGECACHE_H