QVirtualKeyboardInputEngine::virtualKeyRelease.QVirtualKeyboardInputEngine::virtualKeyPress. The input engine contains API functions which the keyboard uses to map user interactions, such as key press and release events, to the input method.įor example, virtual keyboard key events are mapped through the following methods: Like the InputContext, there is only one instance of the QVirtualKeyboardInputEngine. The input engine object is owned by InputContext. Internally, the current input locale is also updated to QVirtualKeyboardInputEngine and the current input method instances. The application can receive this information through the QInputMethod interface. Finally, the contents of layouts/fallback is used as a fallback when there's also no partial match.Īfter the locale selection is done, the keyboard updates the input locale and input direction to match the current layout. If a there isn't a full match, then only the locale language is matched. layouts/fallback – the default layout here is en_GB.įirst, the locale is matched against the full locale name.Matching the keyboard locale follows this sequence: If there are no changes to the default locale, the current system locale is used. However, this must be done before the application initializes and loads the input method plugin. The application can specify the initial layout by changing the default locale. It's imperative that the layouts/fallback directory always contain a set of full implementation files. For the other layout types, you opt for the fallback mechanism. This instructs the virtual keyboard to use the fallback layout instead.įor example: you may add a locale-specific layout for Finnish, that defines the main layout type in main.qml. If the locale-specific layout is the same as that of the fallback locale, you can add a placeholder file for the layout called. The layouts/ directory must contain a fallback/ sub-directory that contains definitions for each layout type.Įach layout directory may contain the definition of one or more layout types. qml-files, fallbacks are defined by a placeholder file with the. Each layout directory must contain a definition or fallback for the following layout types: dialpad, digits, handwriting, main, numbers, and symbols. The Virtual Keyboard Engine generates the list of supported locales from locale-specific layout directories in layouts/. This information includes, but is not limited to: The input context provides access to contextual information that originates from the application. An application should not directly interact with the input context. InputContext is a singleton instance hosted by QML. The input context is used by the keyboard as well as concrete input methods. The input method usually handles key events, but can also handle mouse and touch input events. InputMethod: a base type for QML-based input methods.QVirtualKeyboardAbstractInputMethod: a base type for C++-based input methods.QVirtualKeyboardInputEngine: exposes an API to integrate user input events (key presses, etc.) and acts as a host for input methods.Acts as an interface to the underlying text input component. QVirtualKeyboardInputContext: provides contextual information for the virtual keyboard and other input components.The input framework provides the following main interfaces: The input framework is extensible through a plugin interface, which allows third-party input methods and keyboard layouts to be loaded at runtime. The plugin itself provides an input framework supporting multiple input methods as well as a QML UI for the virtual keyboard. These interfaces allow the plugin to be used as a platform input context plugin in Qt applications. The Qt Virtual Keyboard project is a Qt input context plugin that implements QPlatformInputContextPlugin and QPlatformInputContext interfaces. The Qt Virtual Keyboard supports third-party plugins from the following vendors:īuilding Qt Virtual Keyboard describes how to integrate these plugins into the Qt Virtual Keyboard. To add support for an additional language, see Adding New Keyboard Layouts.
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