cef/tests/cefclient/browser/osr_ime_handler_win.cc

393 lines
13 KiB
C++

// Copyright 2016 The Chromium Embedded Framework Authors. Portions copyright
// 2013 The Chromium Authors. All rights reserved. Use of this source code is
// governed by a BSD-style license that can be found in the LICENSE file.
// Implementation based on ui/base/ime/win/imm32_manager.cc from Chromium.
#include <msctf.h>
#include <windowsx.h>
#include "include/base/cef_build.h"
#include "tests/cefclient/browser/osr_ime_handler_win.h"
#include "tests/cefclient/browser/resource.h"
#include "tests/shared/browser/geometry_util.h"
#include "tests/shared/browser/main_message_loop.h"
#include "tests/shared/browser/util_win.h"
#define ColorUNDERLINE 0xFF000000 // Black SkColor value for underline,
// same as Blink.
#define ColorBKCOLOR 0x00000000 // White SkColor value for background,
// same as Blink.
namespace client {
namespace {
// Determines whether or not the given attribute represents a selection
bool IsSelectionAttribute(char attribute) {
return (attribute == ATTR_TARGET_CONVERTED ||
attribute == ATTR_TARGET_NOTCONVERTED);
}
// Helper function for OsrImeHandlerWin::GetCompositionInfo() method,
// to get the target range that's selected by the user in the current
// composition string.
void GetCompositionSelectionRange(HIMC imc,
int* target_start,
int* target_end) {
int attribute_size = ::ImmGetCompositionString(imc, GCS_COMPATTR, NULL, 0);
if (attribute_size > 0) {
int start = 0;
int end = 0;
std::vector<char> attribute_data(attribute_size);
::ImmGetCompositionString(imc, GCS_COMPATTR, &attribute_data[0],
attribute_size);
for (start = 0; start < attribute_size; ++start) {
if (IsSelectionAttribute(attribute_data[start]))
break;
}
for (end = start; end < attribute_size; ++end) {
if (!IsSelectionAttribute(attribute_data[end]))
break;
}
*target_start = start;
*target_end = end;
}
}
// Helper function for OsrImeHandlerWin::GetCompositionInfo() method, to get
// underlines information of the current composition string.
void GetCompositionUnderlines(
HIMC imc,
int target_start,
int target_end,
std::vector<CefCompositionUnderline>& underlines) {
int clause_size = ::ImmGetCompositionString(imc, GCS_COMPCLAUSE, NULL, 0);
int clause_length = clause_size / sizeof(uint32);
if (clause_length) {
std::vector<uint32> clause_data(clause_length);
::ImmGetCompositionString(imc, GCS_COMPCLAUSE, &clause_data[0],
clause_size);
for (int i = 0; i < clause_length - 1; ++i) {
cef_composition_underline_t underline;
underline.range.from = clause_data[i];
underline.range.to = clause_data[i + 1];
underline.color = ColorUNDERLINE;
underline.background_color = ColorBKCOLOR;
underline.thick = 0;
// Use thick underline for the target clause.
if (underline.range.from >= target_start &&
underline.range.to <= target_end) {
underline.thick = 1;
}
underlines.push_back(underline);
}
}
}
} // namespace
OsrImeHandlerWin::OsrImeHandlerWin(HWND hwnd)
: ime_status_(false),
hwnd_(hwnd),
input_language_id_(LANG_USER_DEFAULT),
is_composing_(false),
cursor_index_(-1),
system_caret_(false) {
ime_rect_ = {-1, -1, 0, 0};
}
OsrImeHandlerWin::~OsrImeHandlerWin() {
DestroyImeWindow();
}
void OsrImeHandlerWin::SetInputLanguage() {
// Retrieve the current input language from the system's keyboard layout.
// Using GetKeyboardLayoutName instead of GetKeyboardLayout, because
// the language from GetKeyboardLayout is the language under where the
// keyboard layout is installed. And the language from GetKeyboardLayoutName
// indicates the language of the keyboard layout itself.
// See crbug.com/344834.
WCHAR keyboard_layout[KL_NAMELENGTH];
if (::GetKeyboardLayoutNameW(keyboard_layout)) {
input_language_id_ =
static_cast<LANGID>(_wtoi(&keyboard_layout[KL_NAMELENGTH >> 1]));
} else {
input_language_id_ = 0x0409; // Fallback to en-US.
}
}
void OsrImeHandlerWin::CreateImeWindow() {
// Chinese/Japanese IMEs somehow ignore function calls to
// ::ImmSetCandidateWindow(), and use the position of the current system
// caret instead -::GetCaretPos().
// Therefore, we create a temporary system caret for Chinese IMEs and use
// it during this input context.
// Since some third-party Japanese IME also uses ::GetCaretPos() to determine
// their window position, we also create a caret for Japanese IMEs.
if (PRIMARYLANGID(input_language_id_) == LANG_CHINESE ||
PRIMARYLANGID(input_language_id_) == LANG_JAPANESE) {
if (!system_caret_) {
if (::CreateCaret(hwnd_, NULL, 1, 1))
system_caret_ = true;
}
}
}
void OsrImeHandlerWin::DestroyImeWindow() {
// Destroy the system caret if we have created for this IME input context.
if (system_caret_) {
::DestroyCaret();
system_caret_ = false;
}
}
void OsrImeHandlerWin::MoveImeWindow() {
// Does nothing when the target window has no input focus.
if (GetFocus() != hwnd_)
return;
CefRect rc = ime_rect_;
int location = cursor_index_;
// If location is not specified fall back to the composition range start.
if (location == -1)
location = composition_range_.from;
// Offset location by the composition range start if required.
if (location >= composition_range_.from)
location -= composition_range_.from;
if (location < static_cast<int>(composition_bounds_.size()))
rc = composition_bounds_[location];
else
return;
HIMC imc = ::ImmGetContext(hwnd_);
if (imc) {
const int kCaretMargin = 1;
if (PRIMARYLANGID(input_language_id_) == LANG_CHINESE) {
// Chinese IMEs ignore function calls to ::ImmSetCandidateWindow()
// when a user disables TSF (Text Service Framework) and CUAS (Cicero
// Unaware Application Support).
// On the other hand, when a user enables TSF and CUAS, Chinese IMEs
// ignore the position of the current system caret and use the
// parameters given to ::ImmSetCandidateWindow() with its 'dwStyle'
// parameter CFS_CANDIDATEPOS.
// Therefore, we do not only call ::ImmSetCandidateWindow() but also
// set the positions of the temporary system caret if it exists.
CANDIDATEFORM candidate_position = {
0, CFS_CANDIDATEPOS, {rc.x, rc.y}, {0, 0, 0, 0}};
::ImmSetCandidateWindow(imc, &candidate_position);
}
if (system_caret_) {
switch (PRIMARYLANGID(input_language_id_)) {
case LANG_JAPANESE:
::SetCaretPos(rc.x, rc.y + rc.height);
break;
default:
::SetCaretPos(rc.x, rc.y);
break;
}
}
if (PRIMARYLANGID(input_language_id_) == LANG_KOREAN) {
// Korean IMEs require the lower-left corner of the caret to move their
// candidate windows.
rc.y += kCaretMargin;
}
// Japanese IMEs and Korean IMEs also use the rectangle given to
// ::ImmSetCandidateWindow() with its 'dwStyle' parameter CFS_EXCLUDE
// Therefore, we also set this parameter here.
CANDIDATEFORM exclude_rectangle = {
0,
CFS_EXCLUDE,
{rc.x, rc.y},
{rc.x, rc.y, rc.x + rc.width, rc.y + rc.height}};
::ImmSetCandidateWindow(imc, &exclude_rectangle);
::ImmReleaseContext(hwnd_, imc);
}
}
void OsrImeHandlerWin::CleanupComposition() {
// Notify the IMM attached to the given window to complete the ongoing
// composition (when given window is de-activated while composing and
// re-activated) and reset the composition status.
if (is_composing_) {
HIMC imc = ::ImmGetContext(hwnd_);
if (imc) {
::ImmNotifyIME(imc, NI_COMPOSITIONSTR, CPS_COMPLETE, 0);
::ImmReleaseContext(hwnd_, imc);
}
ResetComposition();
}
}
void OsrImeHandlerWin::ResetComposition() {
// Reset the composition status.
is_composing_ = false;
cursor_index_ = -1;
}
void OsrImeHandlerWin::GetCompositionInfo(
HIMC imc,
LPARAM lparam,
CefString& composition_text,
std::vector<CefCompositionUnderline>& underlines,
int& composition_start) {
// We only care about GCS_COMPATTR, GCS_COMPCLAUSE and GCS_CURSORPOS, and
// convert them into underlines and selection range respectively.
underlines.clear();
int length = static_cast<int>(composition_text.length());
// Find out the range selected by the user.
int target_start = length;
int target_end = length;
if (lparam & GCS_COMPATTR)
GetCompositionSelectionRange(imc, &target_start, &target_end);
// Retrieve the selection range information. If CS_NOMOVECARET is specified
// it means the cursor should not be moved and we therefore place the caret at
// the beginning of the composition string. Otherwise we should honour the
// GCS_CURSORPOS value if it's available.
// TODO(suzhe): Due to a bug in WebKit we currently can't use selection range
// with composition string.
// See: https://bugs.webkit.org/show_bug.cgi?id=40805
if (!(lparam & CS_NOMOVECARET) && (lparam & GCS_CURSORPOS)) {
// IMM32 does not support non-zero-width selection in a composition. So
// always use the caret position as selection range.
int cursor = ::ImmGetCompositionString(imc, GCS_CURSORPOS, NULL, 0);
composition_start = cursor;
} else {
composition_start = 0;
}
// Retrieve the clause segmentations and convert them to underlines.
if (lparam & GCS_COMPCLAUSE)
GetCompositionUnderlines(imc, target_start, target_end, underlines);
// Set default underlines in case there is no clause information.
if (!underlines.size()) {
CefCompositionUnderline underline;
underline.color = ColorUNDERLINE;
underline.background_color = ColorBKCOLOR;
if (target_start > 0) {
underline.range.from = 0;
underline.range.to = target_start;
underline.thick = 0;
underlines.push_back(underline);
}
if (target_end > target_start) {
underline.range.from = target_start;
underline.range.to = target_end;
underline.thick = 1;
underlines.push_back(underline);
}
if (target_end < length) {
underline.range.from = target_end;
underline.range.to = length;
underline.thick = 0;
underlines.push_back(underline);
}
}
}
bool OsrImeHandlerWin::GetString(HIMC imc,
WPARAM lparam,
int type,
CefString& result) {
if (!(lparam & type))
return false;
LONG string_size = ::ImmGetCompositionString(imc, type, NULL, 0);
if (string_size <= 0)
return false;
// For trailing NULL - ImmGetCompositionString excludes that.
string_size += sizeof(WCHAR);
std::vector<wchar_t> buffer(string_size);
::ImmGetCompositionString(imc, type, &buffer[0], string_size);
result.FromWString(&buffer[0]);
return true;
}
bool OsrImeHandlerWin::GetResult(LPARAM lparam, CefString& result) {
bool ret = false;
HIMC imc = ::ImmGetContext(hwnd_);
if (imc) {
ret = GetString(imc, lparam, GCS_RESULTSTR, result);
::ImmReleaseContext(hwnd_, imc);
}
return ret;
}
bool OsrImeHandlerWin::GetComposition(
LPARAM lparam,
CefString& composition_text,
std::vector<CefCompositionUnderline>& underlines,
int& composition_start) {
bool ret = false;
HIMC imc = ::ImmGetContext(hwnd_);
if (imc) {
// Copy the composition string to the CompositionText object.
ret = GetString(imc, lparam, GCS_COMPSTR, composition_text);
if (ret) {
// Retrieve the composition underlines and selection range information.
GetCompositionInfo(imc, lparam, composition_text, underlines,
composition_start);
// Mark that there is an ongoing composition.
is_composing_ = true;
}
::ImmReleaseContext(hwnd_, imc);
}
return ret;
}
void OsrImeHandlerWin::DisableIME() {
CleanupComposition();
::ImmAssociateContextEx(hwnd_, NULL, 0);
}
void OsrImeHandlerWin::CancelIME() {
if (is_composing_) {
HIMC imc = ::ImmGetContext(hwnd_);
if (imc) {
::ImmNotifyIME(imc, NI_COMPOSITIONSTR, CPS_CANCEL, 0);
::ImmReleaseContext(hwnd_, imc);
}
ResetComposition();
}
}
void OsrImeHandlerWin::EnableIME() {
// Load the default IME context.
::ImmAssociateContextEx(hwnd_, NULL, IACE_DEFAULT);
}
void OsrImeHandlerWin::UpdateCaretPosition(int index) {
// Save the caret position.
cursor_index_ = index;
// Move the IME window.
MoveImeWindow();
}
void OsrImeHandlerWin::ChangeCompositionRange(
const CefRange& selection_range,
const std::vector<CefRect>& bounds) {
composition_range_ = selection_range;
composition_bounds_ = bounds;
MoveImeWindow();
}
} // namespace client