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.cpp b/framework/mail/retriever.cpp
new file mode 100644
index 00000000..b8e29523
--- /dev/null
+++ b/framework/mail/retriever.cpp
@@ -0,0 +1,55 @@
+/*
+    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.
+*/
+
+
+#include "retriever.h"
+
+Retriever::Retriever(QObject *parent) : QObject(parent)
+{
+}
+
+QAbstractItemModel* Retriever::model() const
+{
+    return mModel;
+}
+
+void Retriever::setModel(QAbstractItemModel* model)
+{
+    mValue = QVariant();
+    mModel = model;
+    connect(model, &QAbstractItemModel::rowsInserted, this, &Retriever::onRowsInserted);
+    connect(model, &QAbstractItemModel::modelReset, this, &Retriever::onModelReset);
+    if (model->rowCount(QModelIndex())) {
+        mValue = model->index(0, 0, QModelIndex()).data(mModel->roleNames().key(mPropertyName.toLatin1()));
+        emit valueChanged();
+    }
+}
+
+void Retriever::onRowsInserted(const QModelIndex &parent, int first, int last)
+{
+    if (!mValue.isValid()) {
+        mValue = mModel->index(0, 0, QModelIndex()).data(mModel->roleNames().key(mPropertyName.toLatin1()));
+        emit valueChanged();
+    }
+}
+
+void Retriever::onModelReset()
+{
+    mValue = QVariant();
+}