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// 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.
#include "ui/base/ime/input_method_auralinux.h"
#include "base/environment.h"
#include "ui/base/ime/linux/linux_input_method_context_factory.h"
#include "ui/base/ime/text_input_client.h"
#include "ui/events/event.h"
namespace ui {
InputMethodAuraLinux::InputMethodAuraLinux(
internal::InputMethodDelegate* delegate) {
SetDelegate(delegate);
}
InputMethodAuraLinux::~InputMethodAuraLinux() {}
// static
void InputMethodAuraLinux::Initialize() {
#if (USE_X11)
// Force a IBus IM context to run in synchronous mode.
//
// Background: IBus IM context runs by default in asynchronous mode. In
// this mode, gtk_im_context_filter_keypress() consumes all the key events
// and returns true while asynchronously sending the event to an underlying
// IME implementation. When the event has not actually been consumed by
// the underlying IME implementation, the context pushes the event back to
// the GDK event queue marking the event as already handled by the IBus IM
// context.
//
// The problem here is that those pushed-back GDK events are never handled
// when base::MessagePumpX11 is used, which only handles X events. So, we
// make a IBus IM context run in synchronous mode by setting an environment
// variable. This is only the interface to change the mode.
//
// Another possible solution is to use GDK event loop instead of X event
// loop.
//
// Since there is no reentrant version of setenv(3C), it's a caller's duty
// to avoid race conditions. This function should be called in the main
// thread on a very early stage, and supposed to be called from
// ui::InitializeInputMethod().
scoped_ptr<base::Environment> env(base::Environment::Create());
env->SetVar("IBUS_ENABLE_SYNC_MODE", "1");
#endif
}
// Overriden from InputMethod.
void InputMethodAuraLinux::Init(bool focused) {
CHECK(LinuxInputMethodContextFactory::instance());
input_method_context_ =
LinuxInputMethodContextFactory::instance()->CreateInputMethodContext(
this);
CHECK(input_method_context_.get());
InputMethodBase::Init(focused);
if (focused) {
input_method_context_->OnTextInputTypeChanged(
GetTextInputClient() ?
GetTextInputClient()->GetTextInputType() :
TEXT_INPUT_TYPE_TEXT);
}
}
bool InputMethodAuraLinux::OnUntranslatedIMEMessage(
const base::NativeEvent& event,
NativeEventResult* result) {
return false;
}
bool InputMethodAuraLinux::DispatchKeyEvent(const ui::KeyEvent& event) {
DCHECK(event.type() == ET_KEY_PRESSED || event.type() == ET_KEY_RELEASED);
DCHECK(system_toplevel_window_focused());
// If no text input client, do nothing.
if (!GetTextInputClient())
return DispatchKeyEventPostIME(event);
// Let an IME handle the key event first.
if (input_method_context_->DispatchKeyEvent(event)) {
if (event.type() == ET_KEY_PRESSED) {
const ui::KeyEvent fabricated_event(ET_KEY_PRESSED,
VKEY_PROCESSKEY,
event.flags(),
false); // is_char
DispatchKeyEventPostIME(fabricated_event);
}
return true;
}
// Otherwise, insert the character.
const bool handled = DispatchKeyEventPostIME(event);
if (event.type() == ET_KEY_PRESSED && GetTextInputClient()) {
const uint16 ch = event.GetCharacter();
if (ch) {
GetTextInputClient()->InsertChar(ch, event.flags());
return true;
}
}
return handled;
}
void InputMethodAuraLinux::OnTextInputTypeChanged(
const TextInputClient* client) {
if (!IsTextInputClientFocused(client))
return;
input_method_context_->Reset();
// TODO(yoichio): Support inputmode HTML attribute.
input_method_context_->OnTextInputTypeChanged(client->GetTextInputType());
}
void InputMethodAuraLinux::OnCaretBoundsChanged(const TextInputClient* client) {
if (!IsTextInputClientFocused(client))
return;
input_method_context_->OnCaretBoundsChanged(
GetTextInputClient()->GetCaretBounds());
}
void InputMethodAuraLinux::CancelComposition(const TextInputClient* client) {
if (!IsTextInputClientFocused(client))
return;
input_method_context_->Reset();
input_method_context_->OnTextInputTypeChanged(client->GetTextInputType());
}
void InputMethodAuraLinux::OnInputLocaleChanged() {
}
std::string InputMethodAuraLinux::GetInputLocale() {
return "";
}
base::i18n::TextDirection InputMethodAuraLinux::GetInputTextDirection() {
return input_method_context_->GetInputTextDirection();
}
bool InputMethodAuraLinux::IsActive() {
// InputMethodAuraLinux is always ready and up.
return true;
}
bool InputMethodAuraLinux::IsCandidatePopupOpen() const {
// There seems no way to detect candidate windows or any popups.
return false;
}
// Overriden from ui::LinuxInputMethodContextDelegate
void InputMethodAuraLinux::OnCommit(const base::string16& text) {
TextInputClient* text_input_client = GetTextInputClient();
if (text_input_client)
text_input_client->InsertText(text);
}
void InputMethodAuraLinux::OnPreeditChanged(
const CompositionText& composition_text) {
TextInputClient* text_input_client = GetTextInputClient();
if (text_input_client)
text_input_client->SetCompositionText(composition_text);
}
void InputMethodAuraLinux::OnPreeditEnd() {
TextInputClient* text_input_client = GetTextInputClient();
if (text_input_client && text_input_client->HasCompositionText())
text_input_client->ClearCompositionText();
}
void InputMethodAuraLinux::OnPreeditStart() {}
// Overridden from InputMethodBase.
void InputMethodAuraLinux::OnDidChangeFocusedClient(
TextInputClient* focused_before,
TextInputClient* focused) {
input_method_context_->Reset();
input_method_context_->OnTextInputTypeChanged(
focused ? focused->GetTextInputType() : TEXT_INPUT_TYPE_NONE);
InputMethodBase::OnDidChangeFocusedClient(focused_before, focused);
}
} // namespace ui
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