1 files changed, 59 insertions, 0 deletions
diff --git a/ui/qt/models/cache_proxy_model.h b/ui/qt/models/cache_proxy_model.h
new file mode 100644
index 0000000000..9163a4695c
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+++ b/ui/qt/models/cache_proxy_model.h
@@ -0,0 +1,59 @@
+/* cache_proxy_model.h
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef CACHE_PROXY_MODEL_H
+#define CACHE_PROXY_MODEL_H
+
+#include <config.h>
+
+#include <QIdentityProxyModel>
+#include <QStandardItemModel>
+
+/**
+ * Caches any data read access to the source model, returning an older copy if
+ * the source model is invalidated.
+ *
+ * Only flat data is supported at the moment, tree models (with parents) are
+ * unsupported.
+ */
+class CacheProxyModel : public QIdentityProxyModel
+{
+    Q_OBJECT
+
+public:
+    CacheProxyModel(QObject *parent = 0);
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+    Qt::ItemFlags flags(const QModelIndex &index) const;
+    QVariant headerData(int section, Qt::Orientation orientation,
+                        int role = Qt::DisplayRole) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    void setSourceModel(QAbstractItemModel *newSourceModel);
+
+private:
+    mutable QStandardItemModel cache;
+
+    bool hasModel() const { return sourceModel() != &cache; }
+
+private slots:
+    void resetCacheModel();
+};
+#endif