// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only

/*!

\page qtvirtualkeyboard-build.html

\title Building Qt Virtual Keyboard

\section1 Overview

This document describes how to build the Qt Virtual Keyboard plugin.

The project is split into the following subprojects:
\table
\row
    \li \e examples/virtualkeyboard/basic
    \li Qt Virtual Keyboard Demo application
\row
    \li \e src/components/
    \li Qt Virtual Keyboard Components QML plugin (QtQuick.VirtualKeyboard.Components)
\row
    \li \e src/plugin/
    \li Qt Virtual Keyboard platform input context plugin. This plugin
        provides the QPlatformInputContext interface and works as a
        layer between QML input context and platform.
\row
    \li \e src/plugins/
    \li A directory containing Qt Virtual Keyboard plugins (QtQuick.VirtualKeyboard.Plugins),
        which implement complex input methods, such as the \e HunspellInputMethod.
        Build time configuration specifies which plugins are built and loaded at runtime.
\row
    \li \e src/settings/
    \li Qt Virtual Keyboard Settings QML plugin (QtQuick.VirtualKeyboard.Settings).
        This plugin provides application-configurable settings for the virtual keyboard.
\row
    \li \e src/styles/
    \li Qt Virtual Keyboard Styles QML plugin (QtQuick.VirtualKeyboard.Styles).
\row
    \li \e src/virtualkeyboard/
    \li Qt Virtual Keyboard module and QML plugin.
\endtable

\section2 Configuration Options

The table below contains the top-level options for configuring the virtual
keyboard features. These options are passed to the \e configure tool.

\table
\header
    \li Option
    \li Arguments
    \li Description
    \li Remarks
\row
    \li \e {-vkb-enable <code>[,<code>]*}"
    \li Supported language codes or 'all'
    \li Enables the specified language
    \li The specified languages can be explicitly enabled using this option.
        Each language code has the format \e {language[_country]}, where:
        \list
            \li \e language is a lowercase, two-letter, ISO 639 language code
            \li \e country is an uppercase, two-letter, ISO 3166 country code
        \endlist

        This option can be used to define the language support as required.
        The virtual keyboard can support one or more languages at a time.

        For example, \c {-vkb-enable de_DE,fi_FI} enables support for the
        German and Finnish languages.

        The virtual keyboard automatically includes all supported languages
        if no other languages are specified.
\row
    \li \e -vkb-handwriting
    \li \e [no|example-hwr|myscript-hwr|cerence-hwr]
    \li Enables or disabled handwriting input
    \li This flag enables handwriting input. By default, the engine is
        automatically activated if it is located in the proper plugins folder
        even without using of this option. But, in case MyScript and Cerence SDK
        co-exist, one of [no|myscript-hwr|cerence-hwr] must be configured. The
        \l {Example Handwriting}{example-hwr} option needs to be explicitly
        activated. This can be done for development and testing purposes.
\row
    \li \e [-no]-vkb-arrow-keynavigation
    \li
    \li Enables or disables arrow key navigation for the keyboard
    \li Allows controlling the keyboard using the arrow and return keys. This
        feature is off by default.
\row
    \li \e -vkb-style
    \li \e [standard|retro]
    \li Choose the style of the virtual keyboard
    \li The Qt Virtual Keyboard supports two styles, standard and retro. Both
        styles will be included in the package, but this option allows you to
        change the built-in default style.
\row
    \li \e [-no]-vkb-cangjie
    \li
    \li Enables or disables the Cangjie input method for Traditional Chinese.
    \li This option enables or disables the Cangjie input method for the
        Traditional Chinese language. The input method is enabled by default
        if support for Traditional Chinese is enabled.
\row
    \li \e [-no]-vkb-zhuyin
    \li
    \li Enables or disables the Zhuyin input method for Traditional Chinese.
    \li This option enables or disables the Zhuyin input method for the
        Traditional Chinese language. The input method is enabled by default if
        support for Traditional Chinese is enabled.
\row
    \li \e [-no]-vkb-desktop
    \li
    \li Enables or disables Desktop integration
    \li By default, the desktop integration is enabled when the target
        environment is X11 or Windows desktop. With this option, the desktop
        integration can be disabled.
        \note For embedded integration, where the InputPanel is instantitated
        by the application, there is no need to use this option explicitly. The
        virtual keyboard will not create the desktop input panel if the
        application creates InputPanel before the focus is set to an input field.
\row
    \li \e [-no]-vkb-layouts
    \li
    \li Enables or disables built-in layouts
    \li By default, the virtual keyboard plugin contains the English keyboard layout.
        By specifiying \e -no-vkb-layouts, the built-in layout(s) are excluded from
        the virtual keyboard plugin.
        \note In this scenario, the \c QT_VIRTUALKEYBOARD_LAYOUT_PATH environment
        variable should be set to the file system directory containing the custom
        keyboard layouts before running the application.
\row
    \li \e -vkb-hunspell
    \li \e [no|3rdparty|system]
    \li Choose Hunspell integration
    \li Forces the Hunspell integration method to the specified option. The \e 3rdparty option
        selects the local build of the Hunspell source code using project files in the
        virtual keyboard repo. This option requires that the Hunspell git repository has
        been cloned into \e src/plugins/hunspell/3rdparty/hunspell directory. The \e system
        option selects the system package via \e pkg-config. The \e no option disables the
        Hunspell plugin.
\row
    \li \e -vkb-no-bundle-pinyin
    \li \e n/a
    \li Disables bundling of pinyin resources
    \li This option excludes pinyin resources from the plugin binary. This option may be
        used to reduce the plugin binary size.
\row
    \li \e -vkb-no-bundle-tcime
    \li \e n/a
    \li Disables bundling of tcime resources
    \li This option excludes tcime resources from the plugin binary. This option may be
        used to reduce the plugin binary size.
\row
    \li \e -vkb-cerence-sdk
    \li \e path/to/cerence/sdk
    \li Configures the Cerence SDK location and enables the Cerence Handwriting and XT9 integrations.
    \li The Cerence SDK zip file must be unpacked using the \e src/plugins/cerence/unpack.py
        script. By default, the SDK is unpacked to \e src/plugins/cerence/sdk, where
        the build scripts can pick it up automatically. However, by using the second parameter to the unpack.py
        script, it is possible to use different location for the SDK. In that case, the location must be
        passed to the build script using the -vkb-cerence-sdk command line parameter.
\row
    \li \e -vkb-cerence-static
    \li \e handwriting
    \li Enables static linking of the Cerence Handwriting engine.
    \li The Cerence Handwriting engine is linked dynamically by default. Use \e -vkb-cerence-static to
        force static linking.
\row
    \li \e -vkb-bundle-cerence-hwr or \e -vkb-bundle-cerence
    \li \e n/a
    \li Enables bundling of Cerence Handwriting resources
    \li This option bundles the Cerence Handwriting resources in the plugin binary.
\row
    \li \e -vkb-bundle-xt9 or \e -vkb-bundle-cerence
    \li \e n/a
    \li Enables bundling of XT9 resources
    \li This option bundles the XT9 resources in the plugin binary.
\row
    \li \e -vkb-myscript-sdk
    \li \e path/to/myscript/sdk
    \li Configures the MyScript Text SDK location and enables the MyScript Handwriting integration.
    \li The MyScript Text SDK (zip) which is unpacked to \e src/plugins/myscript/sdk, can be
        picked up automatically by the build scripts. However, the SDK can be placed in different
        location. In that case, the location must be passed to the build script using the \c -vkb-myscript-sdk
        command line parameter.
\row
    \li \e -vkb-myscript-arch
    \li \e [x86|x64|armv7hf|armv7|arm64]
    \li Configures the target CPU architecture
    \li The MyScript Text SDK offers shared (dynamic) libraries for different CPU architectures
        - \e [x86|x64|armv7hf|armv7|arm64] for Linux and \e [x86|x64] for Windows. It can automatically configured.
        However, a user also can specify the target CPU architecture using the \c -vkb-myscript-arch
        command line parameter.
\endtable

\section2 Hunspell Integration

By default, \e HunspellInputMethod will not be available unless the Hunspell
library and development headers are found. For Linux/X11 targets, the Hunspell
library can be provided by installing the libhunspell-dev package.
Alternatively, the Hunspell git repository can be cloned into the
\e src/plugins/hunspell/3rdparty/hunspell directory. The sources are automatically
detected by the qmake and the project will be configured to use the local Hunspell.
If Hunspell sources are used, then the dictionary files must also be
copied into the \e src/plugins/hunspell/3rdparty/hunspell/data directory.

An example of how the directory structure should look after setting up the
Hunspell sources and dictionary files is listed below:

\badcode
3rdparty
└── hunspell
    ├── data
    │   ├── en_GB.aff
    │   └── en_GB.dic
    ├── hunspell <-- Hunspell git repository
    └── CMakeLists.txt
\endcode

\section2 Cerence Handwriting Integration

Cerence Handwriting integration supports the Alphabetic and CJK (Chinese Japanese Korean)
engines. Both engines are integrated via T9WriteInputMethod. The input method is initialized
with one engine at the time. The engine selection happens automatically based on the current
input locale.

\section3 Cerence Handwriting Compatibility

Qt Virtual Keyboard is compatible with Cerence Handwriting v8.7 or later.

\section3 Cerence Handwriting Build Preparations

The contents of the SDK must unpacked using the \e unpack.py script located in the \e cerence
directory. This ensures the correct directory structure for CMake to find the content.

\badcode
$ cd src/plugins/cerence/
$ python unpack.py filename.zip
\endcode

This will unpack the contents to the \e src/plugins/cerence/sdk directory, where the CMake can
pick it up automatically.

Alternatively, you can unpack to any other directory by adding extra parameter to the command
line. In this case, the location of the SDK must be passed to the \e configure script.

\badcode
configure ... -vkb-cerence-sdk /path/to/cerence/sdk
\endcode

\section3 Layout of the Cerence SDK

The extracted content of the SDK looks like this:

\badcode
sdk
├───t9write
│   ├───api
│   ├───data
│   │   ├───arabic
│   │   ├───hebrew
│   │   └───thai
│   └───lib
│       ├───linux
│       │   ├───arm64
│       │   │   ├───shared
│       │   │   │   ├───alphabetic
│       │   │   │   └───cjk
│       │   │   └───static
│       │   │       ├───alphabetic
│       │   │       └───cjk
│       │   └───x86_64
│       │       ├───shared
│       │       │   ├───alphabetic
│       │       │   └───cjk
│       │       └───static
│       │           ├───alphabetic
│       │           └───cjk
│       └───win32
│           ├───x86
│           │   ├───shared
│           │   │   ├───alphabetic
│           │   │   └───cjk
│           │   └───static
│           │       ├───alphabetic
│           │       └───cjk
│           └───x86_64
│               ├───shared
│               │   ├───alphabetic
│               │   └───cjk
│               └───static
│                   ├───alphabetic
│                   └───cjk
└───xt9
    ├───api
    ├───data
    └───lib
        ├───linux
        │   ├───arm64
        │   │   ├───shared
        │   │   └───static
        │   └───x86_64
        │       ├───shared
        │       └───static
        └───win32
            ├───x86
            │   ├───shared
            │   └───static
            └───x86_64
                ├───shared
                └───static
\endcode

Where the contents of each directory are:

\table
\header
    \li Directory
    \li Description
    \li Remarks
\row
    \li \e api
    \li This directory should contain all of the API files
    \li The API files usually located in the "api" and "public" directories
        of the SDK, but sometimes in the "demo" directory.

        When using both Alphabetic and CJK engines at the same time, any
        overlapping files can be copied from either SDK.
\row
    \li \e data
    \li This directory should contain all HWR databases and optionally
        XT9 databases.
    \li HWR database for the Cerence Handwriting Alphabetic:
        \list
            \li \e _databas_le.bin
        \endlist

        HWR database for the Cerence Handwriting CJK:
        \list
            \li \e cjk_HK_std_le.hdb HongKong Chinese
            \li \e cjk_J_std_le.hdb Japanese
            \li \e cjk_K_mkt_le.hdb Korean
            \li \e cjk_S_gb18030_le.hdb Simplified Chinese
            \li \e cjk_T_std_le.hdb Traditional Chinese
        \endlist

        Language database:
        \list
            \li File extension is either \e .ldb or \e .phd
        \endlist
\row
    \li \e lib/<target>/<linkage>/<engine-variant>
    \li Directory structure holding supported target builds.
    \li These directories should hold the desired target libraries.
        If both shared and static libraries are found, shared libraries
        are preferred.
\endtable

The Cerence Handwriting and XT9 integration code is automatically activated when the
Cerence SDK is detected.

All other extensions should be cleaned from the \e [qtbase]/plugins/virtualkeyboard directory
before building the Cerence extensions to avoid conflicting behavior at runtime. The
Cerence extensions do not require any other virtual keyboard plugin to function.

Handwriting databases and language databases for XT9 are installed in the
\e [qtbase]/qtvirtualkeyboard/cerence directory. In addition, there are two other
alternatives for locating these files:

\list
    \li A custom runtime location defined by \l {Environment Variables}
    \li The \e -vkb-bundle-cerence command line option to embed resources in the plugin binaries
\endlist

\section2 MyScript Text SDK Integration

MyScript Text is designed for building applications that enable the recognition of
handwritten text. MyScript Text supports the recognition of isolated characters, cursive,
print and superimposed writing.
MyScript superimposed writing is integrated into Qt Virtual Keyboard. It enables
the recognition of letters, words or parts of words written one over the other,
without any explicit separation between consecutive fragments. It is capable of running
on memory and CPU constrained devices.

\section3 Input handwriting styles of MyScript Text SDK

The end-user can write one word fragment over the other, or one character over the other,
as depicted below. Space between two written words are automatically added, so that there
is no need for an explicit gesture.

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\endraw

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\section3 Language coverage of MyScript Text SDK

MyScript Superimposed supports 72 languages.

\section3 MyScript Text SDK Packages Installation

The MyScript delivery team can provide you the packages with various \c .zip archives.
To access all the code, tools, and resources needed for building your own
handwriting application, \b {extract all the packages in the same destination folder} as
\c src/plugins/myscript/sdk, where the CMake can pick it up automatically.

Alternatively, you can extract the packages to any other directory.
In this case, the location of the SDK must be passed to the \e configure script.

\badcode
configure ... -vkb-myscript-sdk /path/to/myscript/sdk
\endcode

The file hierarchy should look like below:

\badcode
myscript
└── sdk
    ├─── conf
    ├─── doc
    ├─── edk
    ├─── engine
    │   └─── bin
    │       ├─── lin-arm64
    │       │   └─── *.so
    │       ├─── lin-armv7
    │       │   └─── *.so
    │       ├─── lin-armv7hf
    │       │   └─── *.so
    │       ├─── lin-x64
    │       │   └─── *.so
    │       ├─── lin-x86
    │       │   └─── *.so
    │       ├─── win-x64
    │       │   └─── *.dll
    │       ├─── win-x86
    │       │   └─── *.dll
    │       (etc.)
    ├─── rdk
    ├─── resources
    │   ├─── ar
    │   │   └─── *.res
    │   ├─── en_GB
    │   │   └─── *.res
    │   ├─── ja_JP
    │   │   └─── *.res
    │   ├─── ko_KR
    │   │   └─── *.res
    │   ├─── zh_CN
    │   │   └─── *.res
    │   (etc.)
    ├─── tools
    └─── voim
        ├─── api
        ├─── bin
        │   ├─── lin-arm64
        │   │   └─── *.so
        │   ├─── lin-armv7
        │   │   └─── *.so
        │   ├─── lin-armv7hf
        │   │   └─── *.so
        │   ├─── lin-x64
        │   │   └─── *.so
        │   ├─── lin-x86
        │   │   └─── *.so
        │   ├─── win-x64
        │   │   └─── *.dll
        │   ├─── win-x86
        │   │   └─── *.dll
        │   (etc.)
        └─── conf
\endcode

The description for the contents of each directory are:

\table
\header
    \li Directory
    \li Description
\row
    \li \e conf
    \li Contains the language configuration files that the Engine uses to configure language resources.
\row
    \li \e doc
    \li Contains the HTML documentation files. The file \c index.html displays the main page.
\row
    \li \e edk
    \li Contains the Engine Development Kit and handwriting programming elements for each supported programming language API, including code samples.
\row
    \li \e engine
    \li Contains libraries of each engine object, depending on the target platforms it could be SO, A, or DLL.
\row
    \li \e rdk
    \li Contains the Resource Development Kit, i.e. tools and examples for creating custom resources.
\row
    \li \e resources
    \li Contains resource files with the /c .res extension. They are binary assets used at run time by the different MyScript technologies to achieve the various recognition tasks.
\row
    \li \e tools
    \li Contains useful programmer tools including InkTool for ink testing.
\row
    \li \e voim
    \li Contains libraries of MyScript Text Input Method. It is an extension SDK to the MyScript Text recognition system and designed for building input methods using handwriting recognition easily and quickly.
\endtable

\section3 Setting the Certificate of MyScript Text SDK

\b {A valid certificate is mandatory to use the MyScript Text SDK.} This is a
security measure that uniquely identifies you as a legitimate customer of MyScript
technologies. The certificate helps MyScript trace customers' identify and the products
that have been purchased.

The certificate is delivered in the \c {[your_login].vo.zip package}. When you unzip
this package, the certificate is automatically put in the appropriate location.
This ensure that the certificate is instantly working within the services and code
samples that you have been provided with.

\section3 How to build Qt Virtual Keyboard with MyScript Text SDK

The MyScript integration code is automatically activated when the MyScript Text SDK is detected.

Language resources for MyScript Text SDK are installed in the \e [qtbase]/qtvirtualkeyboard/myscript directory.

\section2 Static builds

The virtual keyboard can be built and linked statically against the application.
This implies that Qt is also built statically (using the -static option in the
configure command line).

*/
