Annotation painting

PdfForQtLib/sources/pdfdocumentdrawinterface.h

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+//    Copyright (C) 2020 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    PdfForQt is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef PDFDOCUMENTDRAWINTERFACE_H
+#define PDFDOCUMENTDRAWINTERFACE_H
+
+#include "pdfglobal.h"
+
+class QPainter;
+
+namespace pdf
+{
+class PDFPrecompiledPage;
+class PDFTextLayoutGetter;
+
+class PDFFORQTLIBSHARED_EXPORT IDocumentDrawInterface
+{
+public:
+    explicit inline IDocumentDrawInterface() = default;
+    virtual ~IDocumentDrawInterface() = default;
+
+    /// Performs drawing of additional graphics onto the painter using precompiled page,
+    /// optionally text layout and page point to device point matrix.
+    /// \param painter Painter
+    /// \param pageIndex Page index
+    /// \param compiledPage Compiled page
+    /// \param layoutGetter Layout getter
+    /// \param pagePointToDevicePointMatrix Matrix mapping page space to device point space
+    virtual void drawPage(QPainter* painter,
+                          pdf::PDFInteger pageIndex,
+                          const PDFPrecompiledPage* compiledPage,
+                          PDFTextLayoutGetter& layoutGetter,
+                          const QMatrix& pagePointToDevicePointMatrix) const;
+
+    /// Performs drawing of additional graphics after all pages are drawn onto the painter.
+    /// \param painter Painter
+    /// \param rect Draw rectangle (usually viewport rectangle of the pdf widget)
+    virtual void drawPostRendering(QPainter* painter, QRect rect) const;
+};
+
+}   // namespace pdf
+
+#endif // PDFDOCUMENTDRAWINTERFACE_H