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// 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_base.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/utf_string_conversions.h"
#include "ui/base/ime/ime_bridge.h"
#include "ui/base/ime/input_method_delegate.h"
#include "ui/base/ime/input_method_observer.h"
#include "ui/base/ime/text_input_client.h"
#include "ui/events/event.h"
namespace ui {
InputMethodBase::InputMethodBase()
: sending_key_event_(false),
delegate_(nullptr),
text_input_client_(nullptr) {}
InputMethodBase::~InputMethodBase() {
FOR_EACH_OBSERVER(InputMethodObserver,
observer_list_,
OnInputMethodDestroyed(this));
if (ui::IMEBridge::Get() &&
ui::IMEBridge::Get()->GetInputContextHandler() == this)
ui::IMEBridge::Get()->SetInputContextHandler(nullptr);
}
void InputMethodBase::SetDelegate(internal::InputMethodDelegate* delegate) {
delegate_ = delegate;
}
void InputMethodBase::OnFocus() {
if (ui::IMEBridge::Get())
ui::IMEBridge::Get()->SetInputContextHandler(this);
}
void InputMethodBase::OnBlur() {
if (ui::IMEBridge::Get() &&
ui::IMEBridge::Get()->GetInputContextHandler() == this)
ui::IMEBridge::Get()->SetInputContextHandler(nullptr);
}
void InputMethodBase::SetFocusedTextInputClient(TextInputClient* client) {
SetFocusedTextInputClientInternal(client);
}
void InputMethodBase::DetachTextInputClient(TextInputClient* client) {
if (text_input_client_ != client)
return;
SetFocusedTextInputClientInternal(nullptr);
}
TextInputClient* InputMethodBase::GetTextInputClient() const {
return text_input_client_;
}
void InputMethodBase::OnTextInputTypeChanged(const TextInputClient* client) {
if (!IsTextInputClientFocused(client))
return;
NotifyTextInputStateChanged(client);
}
TextInputType InputMethodBase::GetTextInputType() const {
TextInputClient* client = GetTextInputClient();
return client ? client->GetTextInputType() : TEXT_INPUT_TYPE_NONE;
}
TextInputMode InputMethodBase::GetTextInputMode() const {
TextInputClient* client = GetTextInputClient();
return client ? client->GetTextInputMode() : TEXT_INPUT_MODE_DEFAULT;
}
int InputMethodBase::GetTextInputFlags() const {
TextInputClient* client = GetTextInputClient();
return client ? client->GetTextInputFlags() : 0;
}
bool InputMethodBase::CanComposeInline() const {
TextInputClient* client = GetTextInputClient();
return client ? client->CanComposeInline() : true;
}
void InputMethodBase::ShowImeIfNeeded() {
FOR_EACH_OBSERVER(InputMethodObserver, observer_list_, OnShowImeIfNeeded());
}
void InputMethodBase::AddObserver(InputMethodObserver* observer) {
observer_list_.AddObserver(observer);
}
void InputMethodBase::RemoveObserver(InputMethodObserver* observer) {
observer_list_.RemoveObserver(observer);
}
bool InputMethodBase::IsTextInputClientFocused(const TextInputClient* client) {
return client && (client == GetTextInputClient());
}
bool InputMethodBase::IsTextInputTypeNone() const {
return GetTextInputType() == TEXT_INPUT_TYPE_NONE;
}
void InputMethodBase::OnInputMethodChanged() const {
TextInputClient* client = GetTextInputClient();
if (!IsTextInputTypeNone())
client->OnInputMethodChanged();
}
ui::EventDispatchDetails InputMethodBase::DispatchKeyEventPostIME(
ui::KeyEvent* event) const {
ui::EventDispatchDetails details;
if (delegate_)
details = delegate_->DispatchKeyEventPostIME(event);
return details;
}
void InputMethodBase::NotifyTextInputStateChanged(
const TextInputClient* client) {
FOR_EACH_OBSERVER(InputMethodObserver,
observer_list_,
OnTextInputStateChanged(client));
}
void InputMethodBase::NotifyTextInputCaretBoundsChanged(
const TextInputClient* client) {
FOR_EACH_OBSERVER(
InputMethodObserver, observer_list_, OnCaretBoundsChanged(client));
}
void InputMethodBase::SetFocusedTextInputClientInternal(
TextInputClient* client) {
TextInputClient* old = text_input_client_;
if (old == client)
return;
OnWillChangeFocusedClient(old, client);
text_input_client_ = client; // nullptr allowed.
OnDidChangeFocusedClient(old, client);
NotifyTextInputStateChanged(text_input_client_);
}
std::vector<gfx::Rect> InputMethodBase::GetCompositionBounds(
const TextInputClient* client) {
std::vector<gfx::Rect> bounds;
if (client->HasCompositionText()) {
uint32_t i = 0;
gfx::Rect rect;
while (client->GetCompositionCharacterBounds(i++, &rect))
bounds.push_back(rect);
} else {
// For case of no composition at present, use caret bounds which is required
// by the IME extension for certain features (e.g. physical keyboard
// auto-correct).
bounds.push_back(client->GetCaretBounds());
}
return bounds;
}
bool InputMethodBase::SendFakeProcessKeyEvent(bool pressed) const {
KeyEvent evt(pressed ? ET_KEY_PRESSED : ET_KEY_RELEASED,
pressed ? VKEY_PROCESSKEY : VKEY_UNKNOWN, EF_IME_FABRICATED_KEY);
ignore_result(DispatchKeyEventPostIME(&evt));
return evt.stopped_propagation();
}
void InputMethodBase::CommitText(const std::string& text) {
if (text.empty() || !GetTextInputClient() || IsTextInputTypeNone())
return;
const base::string16 utf16_text = base::UTF8ToUTF16(text);
if (utf16_text.empty())
return;
if (!SendFakeProcessKeyEvent(true))
GetTextInputClient()->InsertText(utf16_text);
SendFakeProcessKeyEvent(false);
}
void InputMethodBase::UpdateCompositionText(const CompositionText& composition_,
uint32_t cursor_pos,
bool visible) {
if (IsTextInputTypeNone() || composition_.text.empty())
return;
if (!SendFakeProcessKeyEvent(true)) {
if (visible)
GetTextInputClient()->SetCompositionText(composition_);
else
GetTextInputClient()->ClearCompositionText();
}
SendFakeProcessKeyEvent(false);
}
void InputMethodBase::DeleteSurroundingText(int32_t offset, uint32_t length) {}
void InputMethodBase::SendKeyEvent(KeyEvent* event) {
sending_key_event_ = true;
DispatchKeyEvent(event);
sending_key_event_ = false;
}
} // namespace ui
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