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// Copyright (c) 2011 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 "views/ime/input_method_win.h"
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "ui/base/keycodes/keyboard_codes.h"
#include "views/events/event.h"
namespace views {
InputMethodWin::InputMethodWin(internal::InputMethodDelegate* delegate)
: active_(false),
direction_(base::i18n::UNKNOWN_DIRECTION),
pending_requested_direction_(base::i18n::UNKNOWN_DIRECTION) {
set_delegate(delegate);
}
InputMethodWin::~InputMethodWin() {
if (widget())
ime_input_.DisableIME(hwnd());
}
void InputMethodWin::Init(Widget* widget) {
InputMethodBase::Init(widget);
// Gets the initial input locale and text direction information.
OnInputLangChange(0, 0);
}
void InputMethodWin::OnFocus() {
DCHECK(!widget_focused());
InputMethodBase::OnFocus();
UpdateIMEState();
}
void InputMethodWin::OnBlur() {
DCHECK(widget_focused());
ConfirmCompositionText();
InputMethodBase::OnBlur();
}
void InputMethodWin::DispatchKeyEvent(const KeyEvent& key) {
// Handles ctrl-shift key to change text direction and layout alignment.
if (ui::ImeInput::IsRTLKeyboardLayoutInstalled() && !IsTextInputTypeNone()) {
ui::KeyboardCode code = key.key_code();
if (key.type() == ui::ET_KEY_PRESSED) {
if (code == ui::VKEY_SHIFT) {
base::i18n::TextDirection dir;
if (ui::ImeInput::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;
}
}
DispatchKeyEventPostIME(key);
}
void InputMethodWin::OnTextInputTypeChanged(View* view) {
if (IsViewFocused(view)) {
ime_input_.CancelIME(hwnd());
UpdateIMEState();
}
}
void InputMethodWin::OnCaretBoundsChanged(View* view) {
gfx::Rect rect;
if (!IsViewFocused(view) || !GetCaretBoundsInWidget(&rect))
return;
ime_input_.UpdateCaretRect(hwnd(), rect);
}
void InputMethodWin::CancelComposition(View* view) {
if (IsViewFocused(view))
ime_input_.CancelIME(hwnd());
}
std::string InputMethodWin::GetInputLocale() {
return locale_;
}
base::i18n::TextDirection InputMethodWin::GetInputTextDirection() {
return direction_;
}
bool InputMethodWin::IsActive() {
return active_;
}
void InputMethodWin::FocusedViewWillChange() {
ConfirmCompositionText();
}
void InputMethodWin::FocusedViewDidChange() {
UpdateIMEState();
}
void InputMethodWin::OnInputLangChange(DWORD character_set,
HKL input_language_id) {
active_ = ime_input_.SetInputLanguage();
locale_ = ime_input_.GetInputLanguageName();
direction_ = ime_input_.GetTextDirection();
OnInputMethodChanged();
}
LRESULT InputMethodWin::OnImeSetContext(
UINT message, WPARAM wparam, LPARAM lparam, BOOL* handled) {
active_ = (wparam == TRUE);
if (active_)
ime_input_.CreateImeWindow(hwnd());
OnInputMethodChanged();
return ime_input_.SetImeWindowStyle(hwnd(), message, wparam, lparam, handled);
}
LRESULT InputMethodWin::OnImeStartComposition(
UINT message, WPARAM wparam, LPARAM lparam, BOOL* handled) {
// We have to prevent WTL from calling ::DefWindowProc() because the function
// calls ::ImmSetCompositionWindow() and ::ImmSetCandidateWindow() to
// over-write the position of IME windows.
*handled = TRUE;
if (IsTextInputTypeNone())
return 0;
// Reset the composition status and create IME windows.
ime_input_.CreateImeWindow(hwnd());
ime_input_.ResetComposition(hwnd());
return 0;
}
LRESULT InputMethodWin::OnImeComposition(
UINT message, WPARAM wparam, LPARAM lparam, BOOL* handled) {
// We have to prevent WTL from calling ::DefWindowProc() because we do not
// want for the IMM (Input Method Manager) to send WM_IME_CHAR messages.
*handled = TRUE;
if (IsTextInputTypeNone())
return 0;
// At first, update the position of the IME window.
ime_input_.UpdateImeWindow(hwnd());
// Retrieve the result string and its attributes of the ongoing composition
// and send it to a renderer process.
ui::CompositionText composition;
if (ime_input_.GetResult(hwnd(), lparam, &composition.text)) {
GetTextInputClient()->InsertText(composition.text);
ime_input_.ResetComposition(hwnd());
// Fall though and try reading the composition string.
// Japanese IMEs send a message containing both GCS_RESULTSTR and
// GCS_COMPSTR, which means an ongoing composition has been finished
// by the start of another composition.
}
// Retrieve the composition string and its attributes of the ongoing
// composition and send it to a renderer process.
if (ime_input_.GetComposition(hwnd(), lparam, &composition))
GetTextInputClient()->SetCompositionText(composition);
return 0;
}
LRESULT InputMethodWin::OnImeEndComposition(
UINT message, WPARAM wparam, LPARAM lparam, BOOL* handled) {
// Let WTL call ::DefWindowProc() and release its resources.
*handled = FALSE;
if (IsTextInputTypeNone())
return 0;
if (GetTextInputClient()->HasCompositionText())
GetTextInputClient()->ClearCompositionText();
ime_input_.ResetComposition(hwnd());
ime_input_.DestroyImeWindow(hwnd());
return 0;
}
LRESULT InputMethodWin::OnChar(
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())
return 0;
int flags = 0;
flags |= (::GetKeyState(VK_MENU) & 0x80)? ui::EF_ALT_DOWN : 0;
flags |= (::GetKeyState(VK_SHIFT) & 0x80)? ui::EF_SHIFT_DOWN : 0;
flags |= (::GetKeyState(VK_CONTROL) & 0x80)? ui::EF_CONTROL_DOWN : 0;
GetTextInputClient()->InsertChar(static_cast<char16>(wparam), flags);
return 0;
}
LRESULT InputMethodWin::OnDeadChar(
UINT message, WPARAM wparam, LPARAM lparam, BOOL* handled) {
*handled = TRUE;
if (IsTextInputTypeNone())
return 0;
// Shows the dead character as a composition text, so that the user can know
// what dead key was pressed.
ui::CompositionText composition;
composition.text.assign(1, static_cast<char16>(wparam));
composition.selection = ui::Range(0, 1);
composition.underlines.push_back(
ui::CompositionUnderline(0, 1, SK_ColorBLACK, false));
GetTextInputClient()->SetCompositionText(composition);
return 0;
}
void InputMethodWin::ConfirmCompositionText() {
if (!IsTextInputTypeNone()) {
ime_input_.CleanupComposition(hwnd());
// Though above line should confirm the client's composition text by sending
// a result text to us, in case the input method and the client are in
// inconsistent states, we check the client's composition state again.
if (GetTextInputClient()->HasCompositionText())
GetTextInputClient()->ConfirmCompositionText();
}
}
void InputMethodWin::UpdateIMEState() {
// Use switch here in case we are going to add more text input types.
// We disable input method in password field.
switch (GetTextInputType()) {
case ui::TEXT_INPUT_TYPE_NONE:
case ui::TEXT_INPUT_TYPE_PASSWORD:
ime_input_.DisableIME(hwnd());
break;
default:
ime_input_.EnableIME(hwnd());
break;
}
}
} // namespace views
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