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9060913dc9
Queries the system list of user-preferred languages, and sends it to the engine just after starting it up. Windows portion of https://github.com/flutter/flutter/issues/45152
94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "flutter/shell/platform/windows/system_utils.h"
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#include <Windows.h>
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#include <sstream>
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#include "flutter/shell/platform/windows/string_conversion.h"
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namespace flutter {
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std::vector<LanguageInfo> GetPreferredLanguageInfo() {
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std::vector<std::wstring> languages = GetPreferredLanguages();
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std::vector<LanguageInfo> language_info;
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language_info.reserve(languages.size());
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for (auto language : languages) {
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language_info.push_back(ParseLanguageName(language));
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}
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return language_info;
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}
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std::vector<std::wstring> GetPreferredLanguages() {
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std::vector<std::wstring> languages;
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DWORD flags = MUI_LANGUAGE_NAME | MUI_UI_FALLBACK;
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// Get buffer length.
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ULONG count = 0;
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ULONG buffer_size = 0;
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if (!::GetThreadPreferredUILanguages(flags, &count, nullptr, &buffer_size)) {
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return languages;
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}
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// Get the list of null-separated languages.
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std::wstring buffer(buffer_size, '\0');
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if (!::GetThreadPreferredUILanguages(flags, &count, buffer.data(),
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&buffer_size)) {
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return languages;
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}
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// Extract the individual languages from the buffer.
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size_t start = 0;
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while (true) {
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// The buffer is terminated by an empty string (i.e., a double null).
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if (buffer[start] == L'\0') {
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break;
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}
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// Read the next null-terminated language.
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std::wstring language(buffer.c_str() + start);
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if (language.size() == 0) {
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break;
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}
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languages.push_back(language);
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// Skip past that language and its terminating null in the buffer.
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start += language.size() + 1;
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}
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return languages;
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}
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LanguageInfo ParseLanguageName(std::wstring language_name) {
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LanguageInfo info;
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// Split by '-', discarding any suplemental language info (-x-foo).
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std::vector<std::string> components;
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std::istringstream stream(Utf8FromUtf16(language_name));
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std::string component;
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while (getline(stream, component, '-')) {
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if (component == "x") {
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break;
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}
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components.push_back(component);
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}
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// Determine which components are which.
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info.language = components[0];
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if (components.size() == 3) {
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info.script = components[1];
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info.region = components[2];
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} else if (components.size() == 2) {
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// A script code will always be four characters long.
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if (components[1].size() == 4) {
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info.script = components[1];
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} else {
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info.region = components[1];
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}
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}
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return info;
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}
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} // namespace flutter
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