What is there involved in adding emoji support for a Qt application? Has anyone done it? Any lessons learnt? I see that shipping an emoji-calable font is part of a requirement, like Google Chrome does it on Windows - and adding a way to enter emoji characters is another, as native keyboards don't support them yet. This is only in the context of the desktop of a QWidgets application.

@ Vadi2 i once have implemented this. This wasn't an easy task and took quite some time. @ Vadi2 said in Emoji support : This does not work for me. I'm pasting 😃 into a QTextEdit - if I use the Emoji One font, it comes up black & white Using fonts for emoji will always result in b/w, since font's are basically nothing more than shapes rendered in a base color. You will never receive colored emoticons using fonts. Here are some implementation hints: i took the emoticons (16x16 PNGs) from Twitter - not all emoticon codes are covered unfortunately, but there are also other sources available for emoticons images i used QTextObjectInterface class i've overridden QTextEdit::createMimeDataFromSelection() to support copy of emoticons (convert custom text object back to unicode) to clipboard connect to QTextDocument::contentsChange() signal to get notified when a emoticon unicode gets pasted from clipboard scan the contexts of the QTextEdit/QTextDocument character by character and check if it's unicode is is an emoticon watch out for the UTF-8 and UTF-16 pitfall (!!!): use QChar::isHighSurrogate(), QChar::isLowSurrogate() and QChar::surrogateToUcs4() methods to convert between UTF-16/UTF-8 and check if a character is a emoticon unicode character keep in mind that some emoticons consist of up to 4 characters which combined result in a single emoticon I researched quite some time before i started implementing, and that was the only way to generically implement this in Qt i've found. (Talking about QtWidgets, not QML)

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Emoji support

Unsolved General and Desktop

21 貼文 6 Posters 17.6k 瀏覽 4 Watching

P Pedro Vicente

@Pedro-Vicente This is my Cmake script

cmake_minimum_required(VERSION 3.16)
project(qrwemoticons VERSION 1.0.0 LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOMOC ON)

if(MSVC)
 set (CMAKE_PREFIX_PATH "C:\\qt_install")
endif()

find_package(Qt6 REQUIRED COMPONENTS Widgets)
find_package(Qt6 REQUIRED COMPONENTS Svg)
find_package(Qt6 REQUIRED COMPONENTS Xml)
qt_standard_project_setup()

add_definitions(-DQRWEMOTICONS_LIB)

add_executable(qrwemoticons
src/QrwEmoticons.cpp 
src/QrwEmoticons_p.cpp 
src/QrwEmoticons_data.cpp 
src/TextEdit.cpp 
src/QrwEmoticonsTextObjectInterface.cpp
include/QrwEmoticons/Global.h 
include/QrwEmoticons/QrwEmoticonsPlugin.h 
include/QrwEmoticons/QrwEmoticons.h 
include/QrwEmoticons/TextEdit.h 
src/QrwEmoticons_p.h 
src/QrwEmoticonsTextObjectInterface_p.h
example-app/src/MainWindow.cpp
example-app/src/MainWindow.h
example-app/main.cpp)

include_directories(include)
include_directories(example-app/src)

target_link_libraries(qrwemoticons PRIVATE Qt6::Widgets)
target_link_libraries(qrwemoticons PRIVATE Qt6::Svg)
target_link_libraries(qrwemoticons PRIVATE Qt6::Xml)
set_target_properties(qrwemoticons PROPERTIES WIN32_EXECUTABLE ON MACOSX_BUNDLE ON)

#plugins
#The json file must reside in one of the include directories specified by the build-system. moc exits 
#with an error when it could not find the specified file.
include_directories(plugin-twitter)
include_directories(shared/src)

add_library(plugin-twitter SHARED 
shared/src/QrwEmoticonsHelper.cpp
shared/src/QrwEmoticonsHelper.h
plugin-twitter/src/plugin.cpp
plugin-twitter/src/plugin.h)
target_link_libraries(plugin-twitter PRIVATE Qt6::Widgets)
target_link_libraries(plugin-twitter PRIVATE Qt6::Svg)
target_link_libraries(plugin-twitter PRIVATE Qt6::Xml)

Pedro Vicente

寫於

#21

@Pedro-Vicente But using that script, gives a link error

mocs_compilation_Debug.obj : error LNK2001: unresolved external symbol "public: static struct QMetaObject const QrwEmoticons::staticMetaObject"