From 8eae3a923a540f3dbfe9445a1d58c59f20294684 Mon Sep 17 00:00:00 2001
From: Stephen Kelly <stephen.kelly@kdab.com>
Date: Mon, 28 Jan 2013 19:17:21 +0100
Subject: Provide the resetInternalData slot to cleanly reset data in proxy
 subclasses.

This was part of Qt 4.8, but Qt 5.0 was branched before that, so
the commit was lost.

Change-Id: I2a2ab3c75a0943ac734d588ebd74bc158dd6aaaf
Reviewed-by: Nils Jeisecke <jeisecke@saltation.de>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
---
 .../code/src_corelib_kernel_qabstractitemmodel.cpp | 34 ++++++++++++++++++++++
 src/corelib/itemmodels/qabstractitemmodel.cpp      | 22 ++++++++++++++
 src/corelib/itemmodels/qabstractitemmodel.h        |  4 +++
 3 files changed, 60 insertions(+)

(limited to 'src/corelib')

diff --git a/src/corelib/doc/snippets/code/src_corelib_kernel_qabstractitemmodel.cpp b/src/corelib/doc/snippets/code/src_corelib_kernel_qabstractitemmodel.cpp
index 2f81b15752..c448c75206 100644
--- a/src/corelib/doc/snippets/code/src_corelib_kernel_qabstractitemmodel.cpp
+++ b/src/corelib/doc/snippets/code/src_corelib_kernel_qabstractitemmodel.cpp
@@ -97,3 +97,37 @@ beginResetModel();
 myData.clear();
 endResetModel();
 //! [11]
+
+//! [12]
+class CustomDataProxy : public QSortFilterProxyModel
+{
+    Q_OBJECT
+public:
+    CustomDataProxy(QObject *parent)
+      : QSortFilterProxyModel(parent)
+    {
+    }
+
+    ...
+
+    QVariant data(const QModelIndex &index, int role)
+    {
+        if (role != Qt::BackgroundRole)
+            return QSortFilterProxyModel::data(index, role);
+
+        if (m_customData.contains(index.row()))
+            return m_customData.value(index.row());
+        return QSortFilterProxyModel::data(index, role);
+    }
+
+private slots:
+    void resetInternalData()
+    {
+        m_customData.clear();
+    }
+
+private:
+  QHash<int, QVariant> m_customData;
+};
+//! [12]
+
diff --git a/src/corelib/itemmodels/qabstractitemmodel.cpp b/src/corelib/itemmodels/qabstractitemmodel.cpp
index 2a2d376a26..90e9886c90 100644
--- a/src/corelib/itemmodels/qabstractitemmodel.cpp
+++ b/src/corelib/itemmodels/qabstractitemmodel.cpp
@@ -865,6 +865,27 @@ void QAbstractItemModelPrivate::columnsRemoved(const QModelIndex &parent,
     }
 }
 
+/*!
+    \since 4.8
+
+    This slot is called just after the internal data of a model is cleared
+    while it is being reset.
+
+    This slot is provided the convenience of subclasses of concrete proxy
+    models, such as subclasses of QSortFilterProxyModel which maintain extra
+    data.
+
+    \snippet code/src_corelib_kernel_qabstractitemmodel.cpp 12
+
+    \note Due to a mistake, this slot is missing in Qt 5.0.
+
+    \sa modelAboutToBeReset(), modelReset()
+*/
+void QAbstractItemModel::resetInternalData()
+{
+
+}
+
 /*!
     \class QModelIndex
     \inmodule QtCore
@@ -3055,6 +3076,7 @@ void QAbstractItemModel::endResetModel()
 {
     Q_D(QAbstractItemModel);
     d->invalidatePersistentIndexes();
+    QMetaObject::invokeMethod(this, "resetInternalData");
     emit modelReset(QPrivateSignal());
 }
 
diff --git a/src/corelib/itemmodels/qabstractitemmodel.h b/src/corelib/itemmodels/qabstractitemmodel.h
index 8e4f12e9ea..6a57ccaca8 100644
--- a/src/corelib/itemmodels/qabstractitemmodel.h
+++ b/src/corelib/itemmodels/qabstractitemmodel.h
@@ -330,6 +330,10 @@ public Q_SLOTS:
     virtual bool submit();
     virtual void revert();
 
+protected Q_SLOTS:
+    // Qt 6: Make virtual
+    void resetInternalData();
+
 protected:
     QAbstractItemModel(QAbstractItemModelPrivate &dd, QObject *parent = 0);
 
-- 
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