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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qbs.
**
** $QT_BEGIN_LICENSE:FDL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\previouspage Project
\nextpage PropertyOptions
\qmltype Properties
\inqmlmodule QbsLanguageItems
\ingroup list-of-items
\keyword QML.Properties
\brief Provides conditional setting of properties.
\note This topic documents the Properties item in the context of \l{Product}
{products}. For more information about using it in sub-projects, see
\l{SubProject}.
The Properties item is an auxiliary item for setting multiple property values conditionally.
In the following example, two properties are set if the project is built for Windows:
\code
Product {
Properties {
condition: qbs.targetOS.includes("windows")
cpp.defines: ["ON_WINDOWS"]
cpp.includePaths: ["extraWindowsIncludes"]
}
}
\endcode
Multiple Properties items can be specified to set properties dependent on different
conditions. The order of appearance is important. Semantics are similar to if-else-chains.
The following example
\code
Product {
Properties {
condition: qbs.targetOS.includes("windows")
cpp.defines: ["ON_WINDOWS"]
cpp.includePaths: ["myWindowsIncludes"]
}
Properties {
condition: qbs.targetOS.includes("linux")
cpp.defines: ["ON_LINUX"]
cpp.includePaths: ["myLinuxIncludes"]
}
cpp.defines: ["ON_UNKNOWN_PLATFORM"]
}
\endcode
is equivalent to
\code
Product {
cpp.defines: {
if (qbs.targetOS.includes("windows"))
return ["ON_WINDOWS"];
if (qbs.targetOS.includes("linux"))
return ["ON_LINUX"];
return ["ON_UNKNOWN_PLATFORM"];
}
cpp.includePaths: {
if (qbs.targetOS.includes("windows"))
return ["myWindowsIncludes"];
if (qbs.targetOS.includes("linux"))
return ["myLinuxIncludes"];
return base;
}
}
\endcode
In Properties items, one can access the \l{Module#outer}{outer value} of a
property.
\code
Product {
Properties {
condition: qbs.targetOS.includes("windows")
cpp.defines: outer.concat("ON_WINDOWS") // === ["FOO", "ON_WINDOWS"]
}
Properties {
condition: qbs.targetOS.includes("linux")
cpp.defines: ["ON_LINUX"] // === ["ON_LINUX"]
}
cpp.defines: ["FOO"]
}
\endcode
We suggest to use the Properties item for mutually exclusive conditions only. It is
especially useful if there are several properties to set, based on the same condition.
*/
/*!
\qmlproperty bool Properties::condition
The condition to be used for the other bindings in this item.
This is a mandatory property that has no default value.
*/
/*!
\qmlproperty bool Properties::overrideListProperties
List properties set within this item will override the values coming from
modules, rather than getting merged with them, which is the default behavior.
Use this in the rare case that a module you depend on inserts a value into
a list property that is problematic for some product.
\defaultvalue \c false
*/
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