Module Definition qmldir Files

module <ModuleIdentifier>

Declares the module identifier of the module. The <ModuleIdentifier> is the (dotted URI notation) identifier for the module, which must match the module's install path.

The module identifier directive must be the first line of the file. Exactly one module identifier directive may exist in the qmldir file.

Example:

module ExampleModule

[singleton] <TypeName> <InitialVersion> <File>

Declares a QML object type to be made available by the module.

• [singleton] Optional. Used to declare a singleton type.

• <TypeName> is the type being made available

• <InitialVersion> is the module version for which the type is to be made available

• <File> is the (relative) file name of the QML file that defines the type

Zero or more object type declarations may exist in the qmldir file. However, each object type must have a unique type name within any particular version of the module.

Example:

//Style.qml with custom singleton type definition
pragma Singleton
import QtQuick 2.0

QtObject {
    property int textSize: 20
    property color textColor: "green"
}

// qmldir declaring the singleton type
module CustomStyles
singleton Style 1.0 Style.qml

// singleton type in use
import QtQuick 2.0
import CustomStyles 1.0

Text {
    font.pixelSize: Style.textSize
    color: Style.textColor
    text: "Hello World"
}

internal <TypeName> <File>

Declares an object type that is in the module but should not be made available to users of the module.

Zero or more internal object type declarations may exist in the qmldir file.

Example:

internal MyPrivateType MyPrivateType.qml

This is necessary if the module is imported remotely (see Remotely Installed Identified Modules) because if an exported type depends on a non-exported type within the module, the engine must also load the non-exported type.

<ResourceIdentifier> <InitialVersion> <File>

Declares a JavaScript file to be made available by the module. The resource will be made available via the specified identifier with the specified version number.

Zero or more JavaScript resource declarations may exist in the qmldir file. However, each JavaScript resource must have a unique identifier within any particular version of the module.

Example:

MyScript 1.0 MyScript.js

See the documentation about defining JavaScript resources and Importing JavaScript Resources In QML for more information.

[optional] plugin <Name> [<Path>]

Declares a plugin to be made available by the module.

• optional denotes that the plugin itself does not contain any relevant code and only serves to load a library it links to. If given, and if any types for the module are already available, indicating that the library has been loaded by some other means, QML will not load the plugin.

• <Name> is the plugin library name. This is usually not the same as the file name of the plugin binary, which is platform dependent. For example, the library MyAppTypes would produce libMyAppTypes.so on Linux and MyAppTypes.dll on Windows.

• <Path> (optional) specifies either:

  • an absolute path to the directory containing the plugin file, or

  • a relative path from the directory containing the qmldir file to the directory containing the plugin file.

By default, the engine searches for the plugin library in the directory that contains the qmldir file. (The plugin search path can be queried with QQmlEngine::pluginPathList() and modified using QQmlEngine::addPluginPath().)

Zero or more C++ plugin declarations may exist in the qmldir file. However, since plugin loading is a relatively expensive operation, clients are advised to specify at most a single plugin.

Example:

plugin MyPluginLibrary

classname <C++ plugin class>

Provides the class name of the C++ plugin used by the module.

This information is required for all the QML modules that depend on a C++ plugin for additional functionality. Qt Quick applications built with static linking cannot resolve the module imports without this information.

typeinfo <File>

Declares a type description file for the module that can be read by QML tools such as Qt Creator to access information about the types defined by the module's plugins. <File> is the (relative) file name of a .qmltypes file.

Example:

typeinfo mymodule.qmltypes

Without such a file, QML tools may be unable to offer features such as code completion for the types defined in your plugins.

depends <ModuleIdentifier> <InitialVersion>

Declares that this module depends on another.

Example:

depends MyOtherModule 1.0

This declaration is necessary only in cases when the dependency is hidden: for example, when the C++ code for one module is used to load QML (perhaps conditionally), which then depends on other modules. In such cases, the depends declaration is necessary to include the other modules in application packages.

import <ModuleIdentifier> [<Version>]

Declares that this module imports another.

Example:

import MyOtherModule 1.0

The types from the other module are made available in the same type namespace as this module is imported into. Omitting the version imports the latest version available of the other module. Specifying auto as version imports the same version as the version of this module specified in the QML import statement.

designersupported

Set this property if the plugin is supported by Qt Quick Designer. By default, the plugin will not be supported.

A plugin that is supported by Qt Quick Designer has to be properly tested. This means that the plugin does not crash when running inside the qml2puppet that is used by Qt Quick Designer to execute QML. Generally, the plugin should work well in the Qt Quick Designer and not cause any show stoppers, like taking excessive amounts of memory, slowing down the qml2puppet heavily, or anything else that renders the plugin effectively unusable in the Qt Quick Designer.

The items of an unsupported plugin are not painted in the Qt Quick Designer, but they are still available as empty boxes and the properties can be edited.

prefer <Path>

This property directs the QML engine to load any further files for this module from <path>, rather than the current directory. This can be used to load files compiled with qmlcachegen.

For example, you can add a module's QML files as resources to a resource path :/my/path/MyModule/. Then, add prefer :/my/path/MyModule to the qmldir file in order to use the files in the resource system, rather than the ones in the file system. If you then use qmlcachegen for those, the pre-compiled files will be available to any clients of the module.