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08daa2c896
The current text input manager is win32-specific due to its use of IMM32. For UWP, we'll need a TSF implementation. Once that happens we'll want to extract out a TextInputManager interface and add a separate UWP implementation of this class.
141 lines
3.8 KiB
C++
141 lines
3.8 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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// 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/text_input_manager_win32.h"
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#include <imm.h>
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#include <memory>
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namespace flutter {
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void TextInputManagerWin32::SetWindowHandle(HWND window_handle) {
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window_handle_ = window_handle;
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}
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void TextInputManagerWin32::CreateImeWindow() {
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if (window_handle_ == nullptr) {
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return;
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}
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// Some IMEs ignore calls to ::ImmSetCandidateWindow() and use the position of
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// the current system caret instead via ::GetCaretPos(). In order to behave
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// as expected with these IMEs, we create a temporary system caret.
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if (!ime_active_) {
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::CreateCaret(window_handle_, nullptr, 1, 1);
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}
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ime_active_ = true;
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// Set the position of the IME windows.
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UpdateImeWindow();
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}
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void TextInputManagerWin32::DestroyImeWindow() {
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if (window_handle_ == nullptr) {
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return;
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}
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// Destroy the system caret created in CreateImeWindow().
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if (ime_active_) {
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::DestroyCaret();
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}
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ime_active_ = false;
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}
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void TextInputManagerWin32::UpdateImeWindow() {
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if (window_handle_ == nullptr) {
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return;
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}
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HIMC imm_context = ::ImmGetContext(window_handle_);
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if (imm_context) {
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MoveImeWindow(imm_context);
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::ImmReleaseContext(window_handle_, imm_context);
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}
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}
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void TextInputManagerWin32::UpdateCaretRect(const Rect& rect) {
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caret_rect_ = rect;
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if (window_handle_ == nullptr) {
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return;
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}
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// TODO(cbracken): wrap these in an RAII container.
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HIMC imm_context = ::ImmGetContext(window_handle_);
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if (imm_context) {
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MoveImeWindow(imm_context);
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::ImmReleaseContext(window_handle_, imm_context);
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}
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}
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long TextInputManagerWin32::GetComposingCursorPosition() const {
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if (window_handle_ == nullptr) {
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return false;
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}
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HIMC imm_context = ::ImmGetContext(window_handle_);
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if (imm_context) {
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// Read the cursor position within the composing string.
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const int pos =
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ImmGetCompositionStringW(imm_context, GCS_CURSORPOS, nullptr, 0);
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::ImmReleaseContext(window_handle_, imm_context);
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return pos;
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}
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return -1;
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}
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std::optional<std::u16string> TextInputManagerWin32::GetComposingString()
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const {
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return GetString(GCS_COMPSTR);
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}
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std::optional<std::u16string> TextInputManagerWin32::GetResultString() const {
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return GetString(GCS_RESULTSTR);
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}
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std::optional<std::u16string> TextInputManagerWin32::GetString(int type) const {
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if (window_handle_ == nullptr || !ime_active_) {
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return std::nullopt;
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}
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HIMC imm_context = ::ImmGetContext(window_handle_);
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if (imm_context) {
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// Read the composing string length.
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const long compose_bytes =
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::ImmGetCompositionString(imm_context, type, nullptr, 0);
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const long compose_length = compose_bytes / sizeof(wchar_t);
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if (compose_length <= 0) {
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::ImmReleaseContext(window_handle_, imm_context);
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return std::nullopt;
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}
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std::u16string text(compose_length, '\0');
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::ImmGetCompositionString(imm_context, type, &text[0], compose_bytes);
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::ImmReleaseContext(window_handle_, imm_context);
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return text;
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}
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return std::nullopt;
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}
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void TextInputManagerWin32::MoveImeWindow(HIMC imm_context) {
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if (GetFocus() != window_handle_ || !ime_active_) {
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return;
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}
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LONG x = caret_rect_.left();
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LONG y = caret_rect_.top();
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::SetCaretPos(x, y);
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COMPOSITIONFORM cf = {CFS_POINT, {x, y}};
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::ImmSetCompositionWindow(imm_context, &cf);
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CANDIDATEFORM candidate_form = {0, CFS_CANDIDATEPOS, {x, y}, {0, 0, 0, 0}};
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::ImmSetCandidateWindow(imm_context, &candidate_form);
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}
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} // namespace flutter
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