Add renameOverwrite() to QAbstractFileEngine.

QFSFileEngine::rename() on Windows doesn't overwrite the existing destination.
Keep that unchanged (it's the desired behavior in QFile::rename), and
provide cross-platform rename-overwrite behavior in the new method.

This is needed by QSaveFile.

Change-Id: I5e753d289d8a53692530a48a1783d62e26169cdc
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/corelib/io/qabstractfileengine.cpp b/src/corelib/io/qabstractfileengine.cpp
index d7cf7e3f15..b12dc47c52 100644
--- a/src/corelib/io/qabstractfileengine.cpp
+++ b/src/corelib/io/qabstractfileengine.cpp
@@ -496,6 +496,24 @@ bool QAbstractFileEngine::rename(const QString &newName)
 }
 
 /*!
+    \since 5.1
+
+    Requests that the file be renamed to \a newName in the file
+    system. If the new name already exists, it must be overwritten.
+    If the operation succeeds, returns true; otherwise returns
+    false.
+
+    This virtual function must be reimplemented by all subclasses.
+
+    \sa setFileName()
+ */
+bool QAbstractFileEngine::renameOverwrite(const QString &newName)
+{
+    Q_UNUSED(newName);
+    return false;
+}
+
+/*!
     Creates a link from the file currently specified by fileName() to
     \a newName. What a link is depends on the underlying filesystem
     (be it a shortcut on Windows or a symbolic link on Unix). Returns