Implement IBusInputContextClient

chromeos/dbus/ibus/ibus_input_context_client.h

+// 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.
+
+#ifndef CHROMEOS_DBUS_IBUS_IBUS_INPUT_CONTEXT_CLIENT_H_
+#define CHROMEOS_DBUS_IBUS_IBUS_INPUT_CONTEXT_CLIENT_H_
+#pragma once
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "chromeos/chromeos_export.h"
+#include "chromeos/dbus/dbus_client_implementation_type.h"
+#include "dbus/object_path.h"
+
+namespace dbus {
+class Bus;
+}  // namespace dbus
+
+namespace chromeos {
+
+class IBusText;
+
+// A class to make the actual DBus calls for IBusInputContext service.
+// The ibus-daemon creates object paths on demand, so the target object path is
+// not determined before calling CreateInputContext. It is good to initialize
+// this class at the callback from CreateInputContext in IBusClient. This class
+// is managed by DBusThreadManager as singleton instance, so we can handle only
+// one input context but it is enough for ChromeOS.
+class CHROMEOS_EXPORT IBusInputContextClient {
+ public:
+  typedef base::Callback<void(const IBusText& text)> CommitTextHandler;
+  typedef base::Callback<void(uint32 keyval, uint32 keycode, uint32 state)>
+      ForwardKeyEventHandler;
+  typedef base::Callback<void(const IBusText& text,
+                              uint32 cursor_pos,
+                              bool visible)>
+      UpdatePreeditTextHandler;
+  typedef base::Callback<void()> ShowPreeditTextHandler;
+  typedef base::Callback<void()> HidePreeditTextHandler;
+  typedef base::Callback<void(bool is_keyevent_used)> ProcessKeyEventCallback;
+
+  virtual ~IBusInputContextClient();
+
+  // Creates object proxy and connects signals.
+  virtual void Initialize(dbus::Bus* bus,
+                          const dbus::ObjectPath& object_path) = 0;
+
+  // Resets object proxy. If you want to use InputContext again, should call
+  // Initialize function again.
+  virtual void ResetObjectProxy() = 0;
+
+  // Returns true if connected to target input context path, otherwise return
+  // false.
+  virtual bool IsConnected() const = 0;
+
+  // Signal handler accessors. Setting function can be called multiple times. If
+  // you call setting function multiple times, previous callback will be
+  // overwritten. Setting functions take null-callback.
+  // Sets CommitText signal handler.
+  virtual void SetCommitTextHandler(
+      const CommitTextHandler& commit_text_handler) = 0;
+  // Sets ForwardKeyEvent signal handler.
+  virtual void SetForwardKeyEventHandler(
+      const ForwardKeyEventHandler& forward_key_event_handler) = 0;
+  // Sets UpdatePreeditText signal handler.
+  virtual void SetUpdatePreeditTextHandler(
+      const UpdatePreeditTextHandler& update_preedit_text_handler) = 0;
+  // Sets ShowPreeditText signal handler.
+  virtual void SetShowPreeditTextHandler(
+      const ShowPreeditTextHandler& show_preedit_text_handler) = 0;
+  // Sets HidePreeditText signal handler.
+  virtual void SetHidePreeditTextHandler(
+      const HidePreeditTextHandler& hide_preedit_text_handler) = 0;
+  // Unsets CommitText signal handler.
+  virtual void UnsetCommitTextHandler() = 0;
+  // Unsets FowardKeyEvent signal handler.
+  virtual void UnsetForwardKeyEventHandler() = 0;
+  // Unsets UpdatePreeditText signal handler.
+  virtual void UnsetUpdatePreeditTextHandler() = 0;
+  // Unsets ShowPreeditText signal handler.
+  virtual void UnsetShowPreeditTextHandler() = 0;
+  // Unsets HidePreeditText signal handler.
+  virtual void UnsetHidePreeditTextHandler() = 0;
+
+  // Invokes SetCapabilities method call.
+  virtual void SetCapabilities(uint32 capability) = 0;
+  // Invokes FocusIn method call.
+  virtual void FocusIn() = 0;
+  // Invokes FocusOut method call.
+  virtual void FocusOut() = 0;
+  // Invokes Reset method call.
+  virtual void Reset() = 0;
+  // Invokes SetCursorLocation method call.
+  virtual void SetCursorLocation(int32 x, int32 y, int32 w, int32 h) = 0;
+  // Invokes ProcessKeyEvent method call. |callback| shold not be null-callback.
+  virtual void ProcessKeyEvent(uint32 keyval,
+                               uint32 keycode,
+                               uint32 state,
+                               const ProcessKeyEventCallback& callback) = 0;
+
+  // Factory function, creates a new instance and returns ownership.
+  // For normal usage, access the singleton via DBusThreadManager::Get().
+  static CHROMEOS_EXPORT IBusInputContextClient* Create(
+      DBusClientImplementationType type);
+
+ protected:
+  // Create() should be used instead.
+  IBusInputContextClient();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(IBusInputContextClient);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_DBUS_IBUS_IBUS_INPUT_CONTEXT_CLIENT_H_