From fbdf76771c50294f0a1c0b450f50affc2100b30a Mon Sep 17 00:00:00 2001
From: Stephen Kelly <stephen.kelly@kdab.com>
Date: Mon, 19 Mar 2012 12:16:12 +0100
Subject: Reserve a virtual method for use with a feature in Qt 5.1.
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The view will query the delegate for roles which are relevant to
the particular delegate. For unrelated roles, the delegate
will not have to repaint when the data changes.

Change-Id: If8f1ba4c2bce7dbcf70de344b984aea1deca0edd
Reviewed-by: Thorbjørn Lund Martsum <tmartsum@gmail.com>
Reviewed-by: David Faure <faure@kde.org>
---
 src/widgets/itemviews/qabstractitemdelegate.cpp | 10 ++++++++++
 src/widgets/itemviews/qabstractitemdelegate.h   |  2 ++
 2 files changed, 12 insertions(+)

(limited to 'src')

diff --git a/src/widgets/itemviews/qabstractitemdelegate.cpp b/src/widgets/itemviews/qabstractitemdelegate.cpp
index ecba3e238f..125beab91b 100644
--- a/src/widgets/itemviews/qabstractitemdelegate.cpp
+++ b/src/widgets/itemviews/qabstractitemdelegate.cpp
@@ -402,6 +402,16 @@ bool QAbstractItemDelegate::helpEvent(QHelpEvent *event,
     return false;
 }
 
+/*!
+    \internal
+
+    This virtual method is reserved and will be used in Qt 5.1.
+*/
+QSet<int> QAbstractItemDelegate::paintingRoles() const
+{
+    return QSet<int>();
+}
+
 QT_END_NAMESPACE
 
 #endif // QT_NO_ITEMVIEWS
diff --git a/src/widgets/itemviews/qabstractitemdelegate.h b/src/widgets/itemviews/qabstractitemdelegate.h
index 2c51dfcac8..89aa1915f6 100644
--- a/src/widgets/itemviews/qabstractitemdelegate.h
+++ b/src/widgets/itemviews/qabstractitemdelegate.h
@@ -114,6 +114,8 @@ public:
                            const QStyleOptionViewItem &option,
                            const QModelIndex &index);
 
+    virtual QSet<int> paintingRoles() const;
+
 Q_SIGNALS:
     void commitData(QWidget *editor);
     void closeEditor(QWidget *editor, QAbstractItemDelegate::EndEditHint hint = NoHint);
-- 
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