| // Copyright (c) 2012 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. |
| |
| #include "ui/base/ime/input_method_win.h" |
| |
| #include "base/basictypes.h" |
| #include "ui/base/ime/text_input_client.h" |
| #include "ui/events/event.h" |
| #include "ui/events/event_constants.h" |
| #include "ui/events/event_utils.h" |
| #include "ui/events/keycodes/keyboard_codes.h" |
| #include "ui/gfx/win/hwnd_util.h" |
| |
| namespace ui { |
| namespace { |
| |
| // Extra number of chars before and after selection (or composition) range which |
| // is returned to IME for improving conversion accuracy. |
| static const size_t kExtraNumberOfChars = 20; |
| |
| } // namespace |
| |
| InputMethodWin::InputMethodWin(internal::InputMethodDelegate* delegate, |
| HWND toplevel_window_handle) |
| : active_(false), |
| toplevel_window_handle_(toplevel_window_handle), |
| direction_(base::i18n::UNKNOWN_DIRECTION), |
| pending_requested_direction_(base::i18n::UNKNOWN_DIRECTION), |
| accept_carriage_return_(false) { |
| SetDelegate(delegate); |
| } |
| |
| void InputMethodWin::Init(bool focused) { |
| // Gets the initial input locale and text direction information. |
| OnInputLocaleChanged(); |
| |
| InputMethodBase::Init(focused); |
| } |
| |
| bool InputMethodWin::DispatchKeyEvent(const ui::KeyEvent& event) { |
| if (!event.HasNativeEvent()) |
| return DispatchFabricatedKeyEvent(event); |
| |
| const base::NativeEvent& native_key_event = event.native_event(); |
| if (native_key_event.message == WM_CHAR) { |
| BOOL handled; |
| OnChar(native_key_event.hwnd, native_key_event.message, |
| native_key_event.wParam, native_key_event.lParam, &handled); |
| return !!handled; // Don't send WM_CHAR for post event processing. |
| } |
| // Handles ctrl-shift key to change text direction and layout alignment. |
| if (ui::IMM32Manager::IsRTLKeyboardLayoutInstalled() && |
| !IsTextInputTypeNone()) { |
| // TODO: shouldn't need to generate a KeyEvent here. |
| const ui::KeyEvent key(native_key_event, |
| native_key_event.message == WM_CHAR); |
| ui::KeyboardCode code = key.key_code(); |
| if (key.type() == ui::ET_KEY_PRESSED) { |
| if (code == ui::VKEY_SHIFT) { |
| base::i18n::TextDirection dir; |
| if (ui::IMM32Manager::IsCtrlShiftPressed(&dir)) |
| pending_requested_direction_ = dir; |
| } else if (code != ui::VKEY_CONTROL) { |
| pending_requested_direction_ = base::i18n::UNKNOWN_DIRECTION; |
| } |
| } else if (key.type() == ui::ET_KEY_RELEASED && |
| (code == ui::VKEY_SHIFT || code == ui::VKEY_CONTROL) && |
| pending_requested_direction_ != base::i18n::UNKNOWN_DIRECTION) { |
| GetTextInputClient()->ChangeTextDirectionAndLayoutAlignment( |
| pending_requested_direction_); |
| pending_requested_direction_ = base::i18n::UNKNOWN_DIRECTION; |
| } |
| } |
| |
| return DispatchKeyEventPostIME(event); |
| } |
| |
| void InputMethodWin::OnInputLocaleChanged() { |
| active_ = imm32_manager_.SetInputLanguage(); |
| locale_ = imm32_manager_.GetInputLanguageName(); |
| direction_ = imm32_manager_.GetTextDirection(); |
| OnInputMethodChanged(); |
| } |
| |
| std::string InputMethodWin::GetInputLocale() { |
| return locale_; |
| } |
| |
| base::i18n::TextDirection InputMethodWin::GetInputTextDirection() { |
| return direction_; |
| } |
| |
| bool InputMethodWin::IsActive() { |
| return active_; |
| } |
| |
| void InputMethodWin::OnDidChangeFocusedClient( |
| TextInputClient* focused_before, |
| TextInputClient* focused) { |
| if (focused_before != focused) |
| accept_carriage_return_ = false; |
| } |
| |
| LRESULT InputMethodWin::OnImeRequest(UINT message, |
| WPARAM wparam, |
| LPARAM lparam, |
| BOOL* handled) { |
| *handled = FALSE; |
| |
| // Should not receive WM_IME_REQUEST message, if IME is disabled. |
| const ui::TextInputType type = GetTextInputType(); |
| if (type == ui::TEXT_INPUT_TYPE_NONE || |
| type == ui::TEXT_INPUT_TYPE_PASSWORD) { |
| return 0; |
| } |
| |
| switch (wparam) { |
| case IMR_RECONVERTSTRING: |
| *handled = TRUE; |
| return OnReconvertString(reinterpret_cast<RECONVERTSTRING*>(lparam)); |
| case IMR_DOCUMENTFEED: |
| *handled = TRUE; |
| return OnDocumentFeed(reinterpret_cast<RECONVERTSTRING*>(lparam)); |
| case IMR_QUERYCHARPOSITION: |
| *handled = TRUE; |
| return OnQueryCharPosition(reinterpret_cast<IMECHARPOSITION*>(lparam)); |
| default: |
| return 0; |
| } |
| } |
| |
| LRESULT InputMethodWin::OnChar(HWND window_handle, |
| UINT message, |
| WPARAM wparam, |
| LPARAM lparam, |
| BOOL* handled) { |
| *handled = TRUE; |
| |
| // We need to send character events to the focused text input client event if |
| // its text input type is ui::TEXT_INPUT_TYPE_NONE. |
| if (GetTextInputClient()) { |
| const char16 kCarriageReturn = L'\r'; |
| const char16 ch = static_cast<char16>(wparam); |
| // A mask to determine the previous key state from |lparam|. The value is 1 |
| // if the key is down before the message is sent, or it is 0 if the key is |
| // up. |
| const uint32 kPrevKeyDownBit = 0x40000000; |
| if (ch == kCarriageReturn && !(lparam & kPrevKeyDownBit)) |
| accept_carriage_return_ = true; |
| // Conditionally ignore '\r' events to work around crbug.com/319100. |
| // TODO(yukawa, IME): Figure out long-term solution. |
| if (ch != kCarriageReturn || accept_carriage_return_) |
| GetTextInputClient()->InsertChar(ch, ui::GetModifiersFromKeyState()); |
| } |
| |
| // Explicitly show the system menu at a good location on [Alt]+[Space]. |
| // Note: Setting |handled| to FALSE for DefWindowProc triggering of the system |
| // menu causes undesirable titlebar artifacts in the classic theme. |
| if (message == WM_SYSCHAR && wparam == VK_SPACE) |
| gfx::ShowSystemMenu(window_handle); |
| |
| return 0; |
| } |
| |
| LRESULT InputMethodWin::OnDeadChar(UINT message, |
| WPARAM wparam, |
| LPARAM lparam, |
| BOOL* handled) { |
| *handled = TRUE; |
| return 0; |
| } |
| |
| LRESULT InputMethodWin::OnDocumentFeed(RECONVERTSTRING* reconv) { |
| ui::TextInputClient* client = GetTextInputClient(); |
| if (!client) |
| return 0; |
| |
| gfx::Range text_range; |
| if (!client->GetTextRange(&text_range) || text_range.is_empty()) |
| return 0; |
| |
| bool result = false; |
| gfx::Range target_range; |
| if (client->HasCompositionText()) |
| result = client->GetCompositionTextRange(&target_range); |
| |
| if (!result || target_range.is_empty()) { |
| if (!client->GetSelectionRange(&target_range) || |
| !target_range.IsValid()) { |
| return 0; |
| } |
| } |
| |
| if (!text_range.Contains(target_range)) |
| return 0; |
| |
| if (target_range.GetMin() - text_range.start() > kExtraNumberOfChars) |
| text_range.set_start(target_range.GetMin() - kExtraNumberOfChars); |
| |
| if (text_range.end() - target_range.GetMax() > kExtraNumberOfChars) |
| text_range.set_end(target_range.GetMax() + kExtraNumberOfChars); |
| |
| size_t len = text_range.length(); |
| size_t need_size = sizeof(RECONVERTSTRING) + len * sizeof(WCHAR); |
| |
| if (!reconv) |
| return need_size; |
| |
| if (reconv->dwSize < need_size) |
| return 0; |
| |
| string16 text; |
| if (!GetTextInputClient()->GetTextFromRange(text_range, &text)) |
| return 0; |
| DCHECK_EQ(text_range.length(), text.length()); |
| |
| reconv->dwVersion = 0; |
| reconv->dwStrLen = len; |
| reconv->dwStrOffset = sizeof(RECONVERTSTRING); |
| reconv->dwCompStrLen = |
| client->HasCompositionText() ? target_range.length() : 0; |
| reconv->dwCompStrOffset = |
| (target_range.GetMin() - text_range.start()) * sizeof(WCHAR); |
| reconv->dwTargetStrLen = target_range.length(); |
| reconv->dwTargetStrOffset = reconv->dwCompStrOffset; |
| |
| memcpy((char*)reconv + sizeof(RECONVERTSTRING), |
| text.c_str(), len * sizeof(WCHAR)); |
| |
| // According to Microsoft API document, IMR_RECONVERTSTRING and |
| // IMR_DOCUMENTFEED should return reconv, but some applications return |
| // need_size. |
| return reinterpret_cast<LRESULT>(reconv); |
| } |
| |
| LRESULT InputMethodWin::OnReconvertString(RECONVERTSTRING* reconv) { |
| ui::TextInputClient* client = GetTextInputClient(); |
| if (!client) |
| return 0; |
| |
| // If there is a composition string already, we don't allow reconversion. |
| if (client->HasCompositionText()) |
| return 0; |
| |
| gfx::Range text_range; |
| if (!client->GetTextRange(&text_range) || text_range.is_empty()) |
| return 0; |
| |
| gfx::Range selection_range; |
| if (!client->GetSelectionRange(&selection_range) || |
| selection_range.is_empty()) { |
| return 0; |
| } |
| |
| DCHECK(text_range.Contains(selection_range)); |
| |
| size_t len = selection_range.length(); |
| size_t need_size = sizeof(RECONVERTSTRING) + len * sizeof(WCHAR); |
| |
| if (!reconv) |
| return need_size; |
| |
| if (reconv->dwSize < need_size) |
| return 0; |
| |
| // TODO(penghuang): Return some extra context to help improve IME's |
| // reconversion accuracy. |
| string16 text; |
| if (!GetTextInputClient()->GetTextFromRange(selection_range, &text)) |
| return 0; |
| DCHECK_EQ(selection_range.length(), text.length()); |
| |
| reconv->dwVersion = 0; |
| reconv->dwStrLen = len; |
| reconv->dwStrOffset = sizeof(RECONVERTSTRING); |
| reconv->dwCompStrLen = len; |
| reconv->dwCompStrOffset = 0; |
| reconv->dwTargetStrLen = len; |
| reconv->dwTargetStrOffset = 0; |
| |
| memcpy(reinterpret_cast<char*>(reconv) + sizeof(RECONVERTSTRING), |
| text.c_str(), len * sizeof(WCHAR)); |
| |
| // According to Microsoft API document, IMR_RECONVERTSTRING and |
| // IMR_DOCUMENTFEED should return reconv, but some applications return |
| // need_size. |
| return reinterpret_cast<LRESULT>(reconv); |
| } |
| |
| LRESULT InputMethodWin::OnQueryCharPosition(IMECHARPOSITION* char_positon) { |
| if (!char_positon) |
| return 0; |
| |
| if (char_positon->dwSize < sizeof(IMECHARPOSITION)) |
| return 0; |
| |
| ui::TextInputClient* client = GetTextInputClient(); |
| if (!client) |
| return 0; |
| |
| gfx::Rect rect; |
| if (client->HasCompositionText()) { |
| if (!client->GetCompositionCharacterBounds(char_positon->dwCharPos, |
| &rect)) { |
| return 0; |
| } |
| } else { |
| // If there is no composition and the first character is queried, returns |
| // the caret bounds. This behavior is the same to that of RichEdit control. |
| if (char_positon->dwCharPos != 0) |
| return 0; |
| rect = client->GetCaretBounds(); |
| } |
| |
| char_positon->pt.x = rect.x(); |
| char_positon->pt.y = rect.y(); |
| char_positon->cLineHeight = rect.height(); |
| return 1; // returns non-zero value when succeeded. |
| } |
| |
| HWND InputMethodWin::GetAttachedWindowHandle( |
| const TextInputClient* text_input_client) const { |
| // On Aura environment, we can assume that |toplevel_window_handle_| always |
| // represents the valid top-level window handle because each top-level window |
| // is responsible for lifecycle management of corresponding InputMethod |
| // instance. |
| #if defined(USE_AURA) |
| return toplevel_window_handle_; |
| #else |
| // On Non-Aura environment, TextInputClient::GetAttachedWindow() returns |
| // window handle to which each input method is bound. |
| if (!text_input_client) |
| return NULL; |
| return text_input_client->GetAttachedWindow(); |
| #endif |
| } |
| |
| bool InputMethodWin::IsWindowFocused(const TextInputClient* client) const { |
| if (!client) |
| return false; |
| HWND attached_window_handle = GetAttachedWindowHandle(client); |
| #if defined(USE_AURA) |
| // When Aura is enabled, |attached_window_handle| should always be a top-level |
| // window. So we can safely assume that |attached_window_handle| is ready for |
| // receiving keyboard input as long as it is an active window. This works well |
| // even when the |attached_window_handle| becomes active but has not received |
| // WM_FOCUS yet. |
| return attached_window_handle && GetActiveWindow() == attached_window_handle; |
| #else |
| return attached_window_handle && GetFocus() == attached_window_handle; |
| #endif |
| } |
| |
| bool InputMethodWin::DispatchFabricatedKeyEvent(const ui::KeyEvent& event) { |
| // TODO(ananta) |
| // Support IMEs and RTL layout in Windows 8 metro Ash. The code below won't |
| // work with IMEs. |
| // Bug: https://code.google.com/p/chromium/issues/detail?id=164964 |
| if (event.is_char()) { |
| if (GetTextInputClient()) { |
| GetTextInputClient()->InsertChar(event.key_code(), |
| ui::GetModifiersFromKeyState()); |
| return true; |
| } |
| } |
| return DispatchKeyEventPostIME(event); |
| } |
| |
| } // namespace ui |