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/*!

\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/basic.pro
    \li Qt Virtual Keyboard Demo application
\row
    \li \e src/virtualkeyboard/import/
    \li Qt Virtual Keyboard QML plugin (QtQuick.VirtualKeyboard)
\row
    \li \e src/virtualkeyboard/plugin/
    \li Qt Virtual Keyboard platform input context plugin. This plugin
        provides the QPlatformInputContext interface for the Qt and is
        also responsible for loading the Virtual Keyboard Plugins
        (QtQuick.VirtualKeyboard.Plugins).
\row
    \li \e src/virtualkeyboard/plugins/
    \li A directory containing Qt Virtual Keyboard plugins, such as the Hunspell plugin
\row
    \li \e src/virtualkeyboard/settings/
    \li Qt Virtual Keyboard Settings QML plugin (QtQuick.VirtualKeyboard.Settings)
\row
    \li \e src/virtualkeyboard/styles/styles.pro
    \li Qt Virtual Keyboard Styles QML plugin (QtQuick.VirtualKeyboard.Styles)
\row
    \li \e src/virtualkeyboard/virtualkeyboard.pro
    \li Qt Virtual Keyboard module, QML components and layouts
\endtable

The input methods are implemented either in C++ or QML.
Qt Virtual Keyboard provides implementations of \e PlainInputMethod,
\e MultitapInputMethod and \e HunspellInputMethod.
The \e MultitapInputMethod is implemented in QML while the others are implemented
in C++.

\section1 Build Instructions

The Qt Virtual Keyboard can be built for Linux Desktop/X11, Windows Desktop
or Boot2Qt targets.
The target is automatically detected by QMAKE and requires no special
configuration parameters.

Qt Creator is the preferred build environment for Qt Virtual Keyboard as you
can then leverage the shadow build functionality and rapidly switch between
build targets.

\section2 Configuration Options

The table below contains the top-level options for configuring the virtual
keyboard features.

\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 [yes|no|t9write]
    \li Enables or disabled handwriting input
    \li This flag enables handwriting input. By default, the first engine
        available at build time is used. The engines are chosen in the
        following order: \c t9write. To force handwriting
        input using to use a specific engine, specify the engine to be used;
        for example, \c {-vkb-handwriting t9write}.
\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.
\endtable

These options can be passed to configure when doing a full build of Qt.
Alternatively, when building only the Qt Virtual Keyboard, you can configure
the keyboard using the following command (where SRCDIR points to the source
directory of QtVirtualKeyboard):

\badcode
qmake $SRCDIR -- [options]
\endcode

\table
\row
    \li \e disable-hunspell
    \li \e n/a
    \li Disables Hunspell integration
    \li Hunspell integration is enabled if the Hunspell library is available on the
        system, or if it is built using the local project file. Integration can be
        disabled using this option.
\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 pinyin
    \li \e lang-zh_CN
    \li Enables the Pinyin input method for Simplified Chinese.
    \li This option activates the Pinyin input method for the Simplified Chinese
        language.

        \include build.qdocinc input-method-language-option-note
\row
    \li \e tcime
    \li \e lang-zh_TW
    \li Enables the both Cangjie and Zhuyin input methods for Traditional Chinese.
    \li This option activates the both Cangjie and Zhuyin input methods for the
        Traditional Chinese language.

        \include build.qdocinc input-method-language-option-note
\row
    \li \e openwnn
    \li \e lang-ja_JP
    \li Enables the OpenWnn input method for Japanese.
    \li This option activates the OpenWnn input method for the Japanese language.

    \include build.qdocinc input-method-language-option-note
\endtable

\section2 Building Documentation

\table
\row
    \li \e {make docs}
    \li Generates documentation
\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 sources can be extracted 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 copying in the
Hunspell sources and dictionary files is listed below:

\badcode
3rdparty
└── hunspell
    ├── data
    │   ├── en_GB.aff
    │   └── en_GB.dic
    ├── hunspell.pro
    └── src
        └── hunspell
            ├── affentry.cxx
            ├── affentry.hxx
            (etc.)
\endcode

\section2 T9 Write Integration

T9 Write integration supports the T9 Write Alphabetic and T9 Write CJK engines. Both
engines are integrated via T9WriteInputMethod. The input method can be initialized
with either of the engines at runtime. The engine selection happens automatically
based on input locale and input mode from the keyboard.

\section3 T9 Write Compatibility

Qt Virtual Keyboard is compatible with T9 Write v7.5.0 onward.

The latest tested version is v7.8.1.

\section3 T9 Write Build Preparations

The contents of the SDK must be either manually copied to the directory structure
described below, or by using the \e unpack.py script found in the t9write directory.

To unpack the SDK using the script:

\badcode
$ cd src/plugins/t9write/3rdparty/t9write/
$ python unpack.py T9Write_Alpha_v7-8-0_SDK.zip .
\endcode

\badcode
3rdparty
└── t9write
    ├─── api
    │   ├─── decuma*.h
    │   ├─── t9write*.h
    │   └─── xxt9w*.h
    ├─── data
    │   ├─── arabic
    │   │   └─── *.bin [T9 Write Arabic]
    │   ├─── hebrew
    │   │   └─── *.bin [T9 Write Hebrew]
    │   ├─── *.bin [T9 Write Alphabetic]
    │   ├─── *.hdb
    │   ├─── *.phd
    │   └─── *.ldb [T9 Write v7.5]
    └─── lib
        ├─── arm
        │   ├─── shared
        │   │   ├─── alphabetic
        │   │   │   └─── *.so
        │   │   └─── cjk
        │   │       └─── *.so
        │   └─── static
        │       ├─── alphabetic
        │       │   └─── *.a / *.o
        │       └─── cjk
        │           └─── *.a / *.o
        ├─── linux-x86
        │   ├─── shared
        │   │   ├─── alphabetic
        │   │   │   └─── *.so
        │   │   └─── cjk
        │   │       └─── *.so
        │   └─── static
        │       ├─── alphabetic
        │       │   └─── *.a / *.o
        │       └─── cjk
        │           └─── *.a / *.o
        └─── win32
            ├─── shared
            │   ├─── alphabetic
            │   │   ├─── *.dll
            │   │   └─── *.lib
            │   └─── cjk
            │       ├─── *.dll
            │       └─── *.lib
            └─── static
                ├─── alphabetic
                │   └─── *.lib / *.obj
                └─── cjk
                    └─── *.lib / *.obj
\endcode

\note The above files are from the T9 Write demo SDK for Windows; the contents may vary for other
      platforms.

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 T9 Write Alphabetic:
        \list
            \li \e _databas_le.bin
        \endlist

        HWR database for the T9 Write 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.

        For example, to enable a static win32 build, copy
        \e t9write_alphabetic_rel.obj to \e lib/win32/static/alphabetic
        directory.
\endtable

Finally, the SDK is included in the build by adding CONFIG+=t9write to the
qmake command line.

\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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<animate begin="oOpacity.end" attributename="opacity" from="0.2" to="0" dur="0.1s" fill="remove" id="l2OpacityFinal"></animate> <set begin="l.end" attributename="opacity" to="1"></set> </path> <path style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;stroke-opacity:1" stroke-dasharray="120" stroke-dashoffset="120" d="m -483.86307,185.14624 c -4.91638,-10.38229 -25.09874,-2.01585 -21.71828,9.09138 4.18358,13.74606 25.60472,15.81949 31.31473,2.0203 8.05585,-19.4683 -24.24366,-20.3309 -24.24366,-12.12183" id="path4907"> <animate begin="l2.end+0.01s" attributename="stroke-dashoffset" from="100px" to="0px" dur="2s" fill="freeze" id="o"></animate> <animate begin="o.end" attributename="opacity" from="1" to="0" dur="2s" fill="freeze" id="oOpacity"></animate> <set begin="l2.end" attributename="opacity" to="1"></set> </path> </g></svg><figcaption>Writing one character over the other</figcaption></figure></div>
<div align="center"><figure><svg xmlns:svg="http://www.w3.org/2000/svg" xmlns="http://www.w3.org/2000/svg" version="1.1" id="svg2" viewbox="0 0 156.63411 96.840738" height="27.330608mm" width="44.205627mm"> <defs id="defs4"></defs> <metadata id="metadata7"> </metadata> <g transform="translate(-19.991064,-156.76845)" id="layer1"> <path id="path3338" stroke-dasharray="700" stroke-dashoffset="700" d="m 20.203051,228.07773 c 7.019038,3.28583 18.296996,2.19868 25.253814,2.0203 27.834023,-0.71369 42.825541,-21.91043 41.416254,-47.98224 -0.323001,-5.97553 -7.191269,-26.45641 -10.606602,-24.74874 -10.259596,5.1298 -9.124503,41.18434 -7.576144,52.02286 1.430314,10.01219 2.165272,8.95563 3.030458,20.20305 0.514408,6.68731 0.563751,12.53255 1.515229,19.19289 0.191958,1.34371 0.355181,2.69156 0.505076,4.04061 0.01859,0.16733 0,0.67344 0,0.50508 0,-2.49868 0.106479,0.64925 -1.010153,-4.04061 -1.138171,-4.78032 -2.879899,-14.31543 -2.525381,-18.68782 0.215131,-2.65328 1.334905,-5.19519 2.525381,-7.57615 1.190476,-2.38095 2.750791,-4.60015 4.545687,-6.56599 2.880061,-3.15435 5.631315,-6.15186 10.101525,-5.55584 7.218425,0.96246 9.158962,18.77507 9.596449,24.24367 0.312712,3.90889 -0.730173,4.84918 1.010153,8.08122 2.037193,3.78335 3.387013,4.88523 8.081223,5.55583 5.47716,0.78246 9.60547,-2.86344 13.63706,-6.06091 2.23856,-1.77541 4.56788,-3.62491 6.06091,-6.06092 4.94323,-8.06526 6.7262,-26.15308 -6.06091,-28.28427 -20.629129,-3.43819 -15.11782,36.04559 11.11167,35.35534 3.30658,-0.087 6.53787,-1.26596 9.59645,-2.52538 25.47885,-10.49129 20.89279,-45.3686 11.61676,-65.65992 -1.54311,-3.37554 -5.32932,-11.06285 -9.09137,-13.13198 -1.47519,-0.81135 -3.36718,0 -5.05077,0 -1.01015,0 -2.08112,-0.34521 -3.03046,0 -9.66282,3.51375 -12.01346,27.64821 -11.11167,36.36549 0.68611,6.63247 4.06851,21.716 8.08122,26.76905 8.89766,11.20446 20.90822,13.3675 34.34518,14.64721 4.58435,0.4366 7.15182,0.9294 10.10153,-2.02031" style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:2;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-miterlimit:4;"> <animate begin="0s;helOpacityFinal.end" attributename="stroke-dashoffset" from="700px" to="0px" dur="2s" fill="freeze" id="hel"></animate> <animate begin="hel.end" attributename="opacity" from="1" to="0.2" dur="3s" fill="freeze" id="helOpacity"></animate> <animate begin="loOpacity.end" attributename="opacity" from="0.2" to="0" dur="0.1s" fill="remove" id="helOpacityFinal"></animate> <set begin="helOpacityFinal.end" attributename="opacity" to="1"></set> </path> <path id="path3344" stroke-dasharray="500" stroke-dashoffset="500" d="m 41.416254,231.61326 c 3.094802,7.92585 11.797035,7.22396 19.192898,7.57614 31.260076,1.48858 50.776938,-24.97346 43.436558,-55.55839 -2.10376,-8.76565 -7.342388,-19.06976 -17.172591,-20.70812 -0.664273,-0.11071 -1.494441,-0.42069 -2.020305,0 -0.542049,0.43364 -0.354492,1.34267 -0.505077,2.0203 -0.522917,2.35313 -1.164511,4.68619 -1.515229,7.07107 -2.708747,18.41948 0.296465,32.36077 6.565992,49.49747 2.682486,7.33213 5.639357,17.22468 15.15229,17.67767 13.38648,0.63746 15.45757,-25.2821 7.07106,-32.82995 -1.55953,-1.40358 -5.88665,6.03367 -4.54568,15.15228 1.46349,9.95173 11.80613,17.40505 21.71828,15.15229 4.41964,-1.00446 11.43406,-9.0399 12.6269,-11.11167 7.10359,-12.33781 -9.7499,-22.51604 -18.18274,-26.26397 -11.05732,-4.91436 -18.5283,7.61904 -12.62691,11.61675 9.07281,6.1461 23.89173,1.97435 32.32488,-1.51523 4.27171,-1.7676 7.7445,-5.05076 11.61676,-7.57614" style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:2;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-miterlimit:4"> <animate begin="hel.end" attributename="stroke-dashoffset" from="500px" to="0px" dur="3s" fill="freeze" id="lo"></animate> <animate begin="lo.end" attributename="opacity" from="1" to="0" dur="2s" fill="freeze" id="loOpacity"></animate> <set begin="hel.end" attributename="opacity" to="1"></set> </path> </g></svg><figcaption>Writing fragments of word over the others</figcaption></figure></div>
\endraw

\section3 Language coverage of MyScript Text SDK

MyScript Superimposed supports 70 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/3rdparty/myscript.

The file hierarchy should look like below:

\badcode
3rdparty
└── myscript
    ├─── conf
    ├─── doc
    ├─── edk
    ├─── engine
    │   └─── bin
    │       ├─── lin-arm64
    │       │   └─── *.so
    │       ├─── lin-armv7
    │       │   └─── *.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-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 Text SDK is included in the build of Qt Virtual Keyboard by either
adding \c CONFIG+=handwriting or \c CONFIG+=myscript to the qmake command line.

\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).

Static builds of the virtual keyboard are enabled by adding \c CONFIG+=static to
the qmake command line and then rebuilding.

Some third party modules used by the virtual keyboard are always built as shared
libraries (e.g. Hunspell).

\section3 Using the static plugin

The following section should be added to the application project file that uses the
statically built virtual keyboard.

\code
static {
    QTPLUGIN += qtvirtualkeyboardplugin
    QT += svg
}
\endcode

\c QTPLUGIN causes qmake to pull linker dependencies for the virtual keyboard
plugin. The SVG module is required as an extra dependency for Qt, since the SVG format is
required by the default styles.

From here on, using a statically built virtual keyboard is no different from the normal
case.

\section1 Deployment

\section2 Desktop Targets

Add a Deploy Step that executes the \e {make install} command, then deploy using
the \e {Deploy All} command.

\section2 Boot2Qt Targets

The installation is done by copying the necessary files to the memory card, or
by using the adb push command.

*/
