PdfSearchModel: be QALM and find search results on all pages

It's a QAbstractListModel, so now PdfMultiPageView has a ListView in a
left-side Drawer showing all results found so far.

- In PdfMultiPageView, multiple pages exist at once, so it makes sense
  to use the same searchmodel for all.
- It's faster and saves memory.
- Search results on each page can be cached.
- It's possible to show search results in a ListView or QListView.

Change-Id: I66fba6975954a09a4d23262be87ff8cc25ee7478
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 84 insertions, 0 deletions

diff --git a/src/pdf/api/qpdfsearchmodel_p.h b/src/pdf/api/qpdfsearchmodel_p.h
new file mode 100644
index 000000000..0855bc216
--- /dev/null
+++ b/src/pdf/api/qpdfsearchmodel_p.h
@@ -0,0 +1,84 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtPDF module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QPDFSEARCHMODEL_P_H
+#define QPDFSEARCHMODEL_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qpdfsearchmodel.h"
+#include "qpdfsearchresult_p.h"
+#include <private/qabstractitemmodel_p.h>
+
+#include "third_party/pdfium/public/fpdfview.h"
+
+QT_BEGIN_NAMESPACE
+
+class QPdfSearchModelPrivate : public QAbstractItemModelPrivate
+{
+    Q_DECLARE_PUBLIC(QPdfSearchModel)
+
+public:
+    QPdfSearchModelPrivate();
+    void clearResults();
+    bool doSearch(int page);
+
+    struct PageAndIndex {
+        int page;
+        int index;
+    };
+    PageAndIndex pageAndIndexForResult(int resultIndex);
+    int rowsBeforePage(int page);
+
+    QPdfDocument *document = nullptr;
+    QString searchString;
+    QVector<bool> pagesSearched;
+    QVector<QVector<QPdfSearchResult>> searchResults;
+    int rowCountSoFar = 0;
+};
+
+QT_END_NAMESPACE
+
+#endif // QPDFSEARCHMODEL_P_H