A helper class to access a value from a model in qml

1 files changed, 55 insertions, 0 deletions

diff --git a/framework/mail/retriever.h b/framework/mail/retriever.h
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+/*
+    Copyright (c) 2016 Christian Mollekopf <mollekopf@kolabsystems.com>
+
+    This library is free software; you can redistribute it and/or modify it
+    under the terms of the GNU Library General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or (at your
+    option) any later version.
+
+    This library 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 Library General Public
+    License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to the
+    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+    02110-1301, USA.
+*/
+
+#pragma once
+
+#include <QObject>
+#include <QAbstractItemModel>
+#include <QVariant>
+
+/**
+ * A wrapper for a QAbstractItemModel to retrieve a value from a single index via property binding
+ * 
+ * Assign a model that retrieves the index, set the property your interested in, and propery-bind "value".
+ */
+class Retriever : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(QAbstractItemModel* model READ model WRITE setModel)
+    Q_PROPERTY(QString propertyName MEMBER mPropertyName)
+    Q_PROPERTY(QVariant value MEMBER mValue NOTIFY valueChanged)
+
+public:
+    explicit Retriever(QObject *parent = Q_NULLPTR);
+
+    QAbstractItemModel* model() const;
+    void setModel(QAbstractItemModel* model);
+
+signals:
+    void valueChanged();
+
+private slots:
+    void onRowsInserted(const QModelIndex &parent, int first, int last);
+    void onModelReset();
+
+private:
+    QString mPropertyName;
+    QVariant mValue;
+    QAbstractItemModel *mModel;
+};