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. QVirtualKeyboardExtensionPlugin: a plugin interface for virtual keyboard extensions that provide additional functionality.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 5 applications. The Qt Virtual Keyboard project is a Qt 5 input context plugin which implements QPlatformInputContextPlugin and QPlatformInputContext interfaces. This document provides a technical overview of the Qt Virtual Keyboard plugin.
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