// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only

/*!
\page qt-target-qml-sources.html
\ingroup cmake-commands-qtqml

\title qt_target_qml_sources
\keyword qt6_target_qml_sources

\brief Add qml files and resources to an existing QML module target.

\cmakecommandsince 6.2

\section1 Synopsis

\badcode
qt_target_qml_sources(
    target
    [QML_FILES ...]
    [RESOURCES ...]
    [PREFIX resource_path]
    [OUTPUT_TARGETS out_targets_var]
    [NO_LINT]
    [NO_CACHEGEN]
    [NO_QMLDIR_TYPES]
)

\endcode

\versionlessCMakeCommandsNote qt6_target_qml_sources()

\section1 Description

\note This command requires CMake 3.19 or later.

\c{qt_target_qml_sources()} provides the ability to add more files to a QML
module after \l{qt6_add_qml_module}{qt_add_qml_module()} has been called.
Typically, you pass the set of \c{.qml} files and resources to
\l{qt6_add_qml_module}{qt_add_qml_module()} directly, but in some cases, it may
be desirable, or even necessary, to add files after
\l{qt6_add_qml_module}{qt_add_qml_module()} has been called. For example, you
may wish to add files conditionally based on an \c{if} statement expression,
or from subdirectories that will only be added if certain criteria are met.
You might want to add a set of files with different characteristics to the
others, such as a different resource prefix, or with linting and bytecode
compilation disabled. The \c{qt_target_qml_sources()} command enables these
scenarios.

\section1 Arguments

The \c target must be the backing target of a QML module, or if the QML module
has no separate backing target, it must be the module's plugin target.

\c QML_FILES is a list of \c{.qml}, \c{.js} and \c{.mjs} files to be added to
the QML module. This option has exactly the same effect as the \c QML_FILES
option of the \l{qt6_add_qml_module}{qt_add_qml_module()} command, including
the automatic compilation to bytecode and lint processing.

The \c NO_CACHEGEN and \c NO_LINT options also have the same effect as they do
for \l{qt6_add_qml_module}{qt_add_qml_module()}. They disable the bytecode
compilation and lint processing for the files listed with \c QML_FILES. This
behavior can also be specified just for individual files using
\l{qml-source-file-properties}{source file properties}.

\c NO_QMLDIR_TYPES prevents the \c QML_FILES from being added as types to the
generated \l{qmldir-autogeneration}{qmldir} file.

\c RESOURCES has exactly the same effect as the \c RESOURCES option of the
\l{qt6_add_qml_module}{qt_add_qml_module()} command. It provides a list of
files to be added to the \c target as ordinary resources. These files are
typically things like images, shaders, etc. that the QML code refers to in some
way.

\target PREFIX
Files added to the module via \c QML_FILES or \c RESOURCES will be placed under
the same resource prefix and target path as they would if they were added by the
\l{qt6_add_qml_module}{qt_add_qml_module()} command. This can be overridden by
providing a different location with the \c PREFIX option. The value following
the \c PREFIX keyword will be used directly, without appending any target path.
The final resource path of each file will be the prefix, plus the path of the
file below the \c CMAKE_CURRENT_SOURCE_DIR. The \l{QT_RESOURCE_ALIAS} source
file property can also be used to override that relative path.

\badcode
qt_add_qml_module(backing
    URI Example
    VERSION 1.0
    RESOURCE_PREFIX /my.company.com/imports
)

qt_target_qml_sources(backing
    QML_FILES special/First.qml
    RESOURCES icons/logo.png
)

qt_target_qml_sources(backing
    PREFIX /other.company.com/debugging
    QML_FILES Inspector.qml
)
\endcode

In the above example, the \c backing target's resources will end up with the
following contents:

\list
\li \c{/my.company.com/imports/Example/special/First.qml}
\li \c{/my.company.com/imports/Example/icons/logo.png}
\li \c{/other.company.com/debugging/Inspector.qml}
\endlist

\c OUTPUT_TARGETS is also analogous to the same option for
\l{qt6_add_qml_module}{qt_add_qml_module()}. Use it to specify the name of a
variable in which to store any additional targets created for static builds.
If the \c target will be installed, these additional targets will also need to
be installed to satisfy linking requirements.

\target qml-source-file-properties
\section1 Source File Properties

A number of source file properties can be used to influence how each individual
\c{.qml} file is treated at various points in the QML module processing. These
override any higher level options specified in calls to
\c{qt_target_qml_sources()} or \l{qt6_add_qml_module}{qt_add_qml_module()}.
All of these properties need to be set before the files are added with either
of those two commands.

\c QT_QML_SKIP_QMLLINT can be set to \c TRUE on a source file to prevent it
from being included in the \l{qmllint-auto}{automatic qmllint processing}.
By default, all \c{.qml} files will be included in the target's lint run, but
this option can be used to exclude specific files.

\c QT_QML_SKIP_CACHEGEN does a similar thing, preventing a source file from
being compiled to byte code when this property is set to \c TRUE. Note that the
file will still be added to the \c target as a resource in uncompiled form
(see \l{qmlcachegen-auto}{Caching compiled QML sources}).

Set the \c QT_QML_SKIP_QMLDIR_ENTRY source file property to \c TRUE to prevent
that QML or JavaScript file from being added as a type to the QML module's
\c{qmldir} file (see \l{qmldir-autogeneration}{Auto-generating \c{qmldir} and
typeinfo files}). This would normally be used for a file that does not expose
a public type, such as a private JavaScript file. For JavaScript files with
upper case names that are neither ECMAScript modules nor declared as stateless
libraries via \c{.pragma library} you should consider this option. If you
include them in the \c{qmldir} file, they are re-evaluated in the scope of
every QML document that explicitly or implicitly imports the module they
belong to.

By default, when \l{qmldir-autogeneration}{generating the \c qmldir file}, a
single type entry will be generated for each \c{.qml} file that provides a type.
It will be given a version number \c{X.0} where \c{X} is the major version of
the QML module. If the QML module has any \c PAST_MAJOR_VERSIONS set, the same
pattern will be applied to those too, appending \c{X.0} for each past major
version \c{X}. For situations where a file needs to provide type entries for
a different set of versions instead (e.g. it was first added in a minor patch
version after the \c{.0} release), specify those versions in the source file's
\c QT_QML_SOURCE_VERSIONS property. One type entry will be created for each
version.

If the type that a \c{.qml} file provides is a singleton, set its
\c QT_QML_SINGLETON_TYPE property to \c TRUE. Similarly, the file's
\c QT_QML_INTERNAL_TYPE source property can be set to \c TRUE to indicate that
the type it provides is an internal one. The name of the type itself can also
be overridden using the \c QT_QML_SOURCE_TYPENAME property. All three of these
will be reflected in the file's type entries in the
\l{qmldir-autogeneration}{generated \c qmldir file}.
The source properties must be set before \l{qt_add_qml_module}{creating} the
module the singleton belongs to.

\target QT_RESOURCE_ALIAS
All files listed with \c QML_FILES or \c RESOURCES will be added to the
\c{target}'s resources. Their location in the resources consists of a base point
and a relative path. The base point defaults to the concatenation of the QML
module's resource prefix and its target path, but these can be overridden with
the \l PREFIX argument. The relative path will default to the path of the file
relative to the \c{target}'s \c SOURCE_DIR target property. This relative path
can be overridden by setting the \c QT_RESOURCE_ALIAS property on the source
file. This is commonly used to collect files from different directories and
have them appear in the resources under a common location.
However, since Qt 6.8, enabling \l{QTP0004} is often a better option if the goal
is that all files of the QML module can be found in the implicit import.
In cases where such a manual setup is still necessary, it is advisable to pass
\c {NO_GENERATE_EXTRA_QMLDIRS} to \c{qt_add_qml_module}, as the extra qmldirs do
not take resource file aliasing into consideration.

\target qt_target_qml_sources_example
\snippet cmake/qt_target_qml_sources/CMakeLists.txt 0

In the above example, the \c qt_target_qml_sources_example target's resources
will end up with the following contents:

\list
\li \c{/my.company.com/imports/Example/File.qml}
\li \c{/my.company.com/imports/Example/FunnySingleton.qml}
\li \c{/my.company.com/imports/Example/templates/File.qml}
\li \c{/my.company.com/imports/Example/some_old_thing.qml}
\li \c{/my.company.com/imports/Example/button-types.png}
\li \c{/my.company.com/imports/Example/doc/README.txt}
\endlist

The generated \c qmldir file will contain the following type entries:

\badcode
File 2.0 File.qml
singleton FunnySingleton 2.0 FunnySingleton.qml
OldThing 1.1 some_old_thing.qml
OldThing 2.0 some_old_thing.qml
\endcode

\note The source FunnySingleton.qml file must already contain
the \c {pragma Singleton} statement. Setting the \c QT_QML_SINGLETON_TYPE source
property does not automatically generate the pragma.

\snippet cmake/qt_target_qml_sources/FunnySingleton.qml 0

*/
