Added QML coding convention for "private" properties.

Private properties start with two underscores. __property

Reviewed-by: David Boddie

2 files changed, 64 insertions, 3 deletions

diff --git a/doc/src/declarative/codingconventions.qdoc b/doc/src/declarative/codingconventions.qdoc
index ba789e0..3f92d46 100644
--- a/doc/src/declarative/codingconventions.qdoc
+++ b/doc/src/declarative/codingconventions.qdoc
@@ -35,7 +35,7 @@ This page assumes that you are already familiar with the QML language.
 If you need an introduction to the language, please read \l {Introduction to the QML language}{the QML introduction} first.
 
 
-\section1 QML objects
+\section1 QML Objects
 
 Through our documentation and examples, QML objects are always structured in the following order:
 
@@ -58,7 +58,7 @@ For example, a hypothetical \e photo QML object would look like this:
 \snippet doc/src/snippets/declarative/codingconventions/photo.qml 0
 
 
-\section1 Grouped properties
+\section1 Grouped Properties
 
 If using multiple properties from a group of properties,
 we use the \e {group notation} rather than the \e {dot notation} to improve readability.
@@ -72,6 +72,18 @@ can be written like this:
 \snippet doc/src/snippets/declarative/codingconventions/dotproperties.qml 1
 
 
+\section1 Private Properties
+
+QML and JavaScript do not enforce private properties like C++. There is a need
+to hide these private properties, for example, when the properties are part of
+the implementation. As a convention, private properties begin with two
+\e underscore characters. For example, \c __area, is a property that is
+accessible but is not meant for public use. Note that QML and JavaScript will
+grant the user access to these properties.
+
+\snippet doc/src/snippets/declarative/codingconventions/private.qml 0
+
+
 \section1 Lists
 
 If a list contains only one element, we generally omit the square brackets.
@@ -87,7 +99,7 @@ we will write this:
 \snippet doc/src/snippets/declarative/codingconventions/lists.qml 1
 
 
-\section1 JavaScript code
+\section1 JavaScript Code
 
 If the script is a single expression, we recommend writing it inline:
 
diff --git a/doc/src/snippets/declarative/codingconventions/private.qml b/doc/src/snippets/declarative/codingconventions/private.qml
new file mode 100644
index 0000000..1d3dda8
--- /dev/null
+++ b/doc/src/snippets/declarative/codingconventions/private.qml
@@ -0,0 +1,49 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 1.0
+
+//! [0]
+Item {
+    id: component
+    width: 40; height: 50
+    property real __area: width * height * 0.5    //not meant for outside use
+}
+//! [0]