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// Copyright 2016 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.
#ifndef BLIMP_CLIENT_FEATURE_IME_FEATURE_H_
#define BLIMP_CLIENT_FEATURE_IME_FEATURE_H_
#include <map>
#include <string>
#include "base/macros.h"
#include "blimp/client/blimp_client_export.h"
#include "blimp/net/blimp_message_processor.h"
#include "ui/base/ime/text_input_type.h"
namespace blimp {
namespace client {
// Handles all incoming and outgoing protobuf messages for text input of type
// BlimpMessage::IME for blimp client.
// Upon receiving a text input request from the engine, the ImeFeature caches
// the |tab_id_| and |render_widget_id_| for the request and
// delegates the request to the Delegate which then opens up the IME.
// After user is done typing, the text is passed back to ImeFeature, which then
// sends the text to the engine over network along with the same |tab_id_| and
// |render_widget_id_|.
// Any time user taps on an input text, ImeMessage::SHOW_IME message will be
// sent to client. Similarly, any time the text input is out of focus (e.g. if
// user navigates away from the currently page or the page loads for the first
// time), ImeMessage::HIDE_IME will be sent.
class BLIMP_CLIENT_EXPORT ImeFeature : public BlimpMessageProcessor {
public:
// A delegate to be notified of text input requests.
class Delegate {
public:
virtual void OnShowImeRequested(ui::TextInputType input_type,
const std::string& text) = 0;
virtual void OnHideImeRequested() = 0;
};
ImeFeature();
~ImeFeature() override;
// Set the BlimpMessageProcessor that will be used to send BlimpMessage::IME
// messages to the engine.
void set_outgoing_message_processor(
std::unique_ptr<BlimpMessageProcessor> processor) {
outgoing_message_processor_ = std::move(processor);
}
// Sets a Delegate to be notified of all text input messages.
// Passing a null |delegate| causes IME messages to be ignored.
void set_delegate(Delegate* delegate) { delegate_ = delegate; }
// Sends text from IME to the blimp engine.
void OnImeTextEntered(const std::string& text);
private:
// BlimpMessageProcessor implementation.
void ProcessMessage(std::unique_ptr<BlimpMessage> message,
const net::CompletionCallback& callback) override;
// Delegate for processing the text input related messages. |delegate_| must
// remain valid until the last message has been passed to ImeFeature.
Delegate* delegate_ = nullptr;
// Tab id and render widget id for the input field for which user input is
// being requested.
// The values are cached from the ImeMessage::SHOW_IME message and sent back
// to engine in the subsequent ImeMessage::SET_TEXT message.
// The cached values are cleared on receiving ImeMessage::HIDE_IME request.
int tab_id_ = -1;
int render_widget_id_ = 0;
// Used to send BlimpMessage::IME messages to the engine.
std::unique_ptr<BlimpMessageProcessor> outgoing_message_processor_;
DISALLOW_COPY_AND_ASSIGN(ImeFeature);
};
} // namespace client
} // namespace blimp
#endif // BLIMP_CLIENT_FEATURE_IME_FEATURE_H_
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