/* -*- mode: C; c-basic-offset: 4; indent-tabs-mode: nil; -*- */

/* vim:set et sts=4: */

/* ibus - The Input Bus

 * Copyright (C) 2008-2013 Peng Huang <shawn.p.huang@gmail.com>

 * Copyright (C) 2018 Takao Fujiwara <takao.fujiwara1@gmail.com>

 * Copyright (C) 2008-2018 Red Hat, Inc.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301

 * USA

 */

#include <stdarg.h>

#include <string.h>

#include "ibusaccelgroup.h"

#include "ibusengine.h"

#include "ibuskeysyms.h"

#include "ibusmarshalers.h"

#include "ibusinternal.h"

#include "ibusshare.h"

#include "ibusxevent.h"

#define IBUS_ENGINE_GET_PRIVATE(o)  \

   (G_TYPE_INSTANCE_GET_PRIVATE ((o), IBUS_TYPE_ENGINE, IBusEnginePrivate))

enum {

    PROCESS_KEY_EVENT,

    FOCUS_IN,

    FOCUS_OUT,

    RESET,

    ENABLE,

    DISABLE,

    SET_CURSOR_LOCATION,

    SET_CAPABILITIES,

    PAGE_UP,

    PAGE_DOWN,

    CURSOR_UP,

    CURSOR_DOWN,

    PROPERTY_ACTIVATE,

    PROPERTY_SHOW,

    PROPERTY_HIDE,

    CANDIDATE_CLICKED,

    SET_SURROUNDING_TEXT,

    PROCESS_HAND_WRITING_EVENT,

    CANCEL_HAND_WRITING,

    SET_CONTENT_TYPE,

    LAST_SIGNAL,

};

enum {

    PROP_0,

    PROP_ENGINE_NAME,

};

/* IBusEnginePriv */

struct _IBusEnginePrivate {

    gchar *engine_name;

    GDBusConnection *connection;

    /* cached surrounding text (see also IBusInputContextPrivate and

       BusEngineProxy) */

    IBusText *surrounding_text;

    guint surrounding_cursor_pos;

    guint selection_anchor_pos;

    /* cached content-type */

    guint content_purpose;

    guint content_hints;

    GHashTable            *extension_keybindings;

    gboolean               enable_extension;

    gchar                 *current_extension_name;

};

static guint            engine_signals[LAST_SIGNAL] = { 0 };

static IBusText *text_empty;

/* functions prototype */

static void      ibus_engine_destroy         (IBusEngine         *engine);

static void      ibus_engine_set_property    (IBusEngine         *engine,

                                              guint               prop_id,

                                              const GValue       *value,

                                              GParamSpec         *pspec);

static void      ibus_engine_get_property    (IBusEngine         *engine,

                                              guint               prop_id,

                                              GValue             *value,

                                              GParamSpec         *pspec);

static void      ibus_engine_service_method_call

                                              (IBusService        *service,

                                               GDBusConnection    *connection,

                                               const gchar        *sender,

                                               const gchar        *object_path,

                                               const gchar        *interface_name,

                                               const gchar        *method_name,

                                               GVariant           *parameters,

                                               GDBusMethodInvocation

                                                                  *invocation);

static GVariant *ibus_engine_service_get_property

                                             (IBusService        *service,

                                              GDBusConnection    *connection,

                                              const gchar        *sender,

                                              const gchar        *object_path,

                                              const gchar        *interface_name,

                                              const gchar        *property_name,

                                              GError            **error);

static gboolean  ibus_engine_service_set_property

                                             (IBusService        *service,

                                              GDBusConnection    *connection,

                                              const gchar        *sender,

                                              const gchar        *object_path,

                                              const gchar        *interface_name,

                                              const gchar        *property_name,

                                              GVariant           *value,

                                              GError            **error);

static gboolean  ibus_engine_process_key_event

                                             (IBusEngine         *engine,

                                              guint               keyval,

                                              guint               keycode,

                                              guint               state);

static void      ibus_engine_focus_in        (IBusEngine         *engine);

static void      ibus_engine_focus_out       (IBusEngine         *engine);

static void      ibus_engine_reset           (IBusEngine         *engine);

static void      ibus_engine_enable          (IBusEngine         *engine);

static void      ibus_engine_disable         (IBusEngine         *engine);

static void      ibus_engine_set_cursor_location

                                             (IBusEngine         *engine,

                                              gint                x,

                                              gint                y,

                                              gint                w,

                                              gint                h);

static void      ibus_engine_set_capabilities

                                             (IBusEngine         *engine,

                                              guint               caps);

static void      ibus_engine_page_up         (IBusEngine         *engine);

static void      ibus_engine_page_down       (IBusEngine         *engine);

static void      ibus_engine_cursor_up       (IBusEngine         *engine);

static void      ibus_engine_cursor_down     (IBusEngine         *engine);

static void      ibus_engine_candidate_clicked

                                             (IBusEngine         *engine,

                                              guint               index,

                                              guint               button,

                                              guint               state);

static void      ibus_engine_property_activate

                                             (IBusEngine         *engine,

                                              const gchar        *prop_name,

                                              guint               prop_state);

static void      ibus_engine_property_show   (IBusEngine         *engine,

                                              const gchar        *prop_name);

static void      ibus_engine_property_hide   (IBusEngine         *engine,

                                              const gchar        *prop_name);

static void      ibus_engine_set_surrounding_text

                                            (IBusEngine         *engine,

                                             IBusText           *text,

                                             guint               cursor_pos,

                                             guint               anchor_pos);

static void      ibus_engine_process_hand_writing_event

                                             (IBusEngine         *engine,

                                              const gdouble      *coordinates,

                                              guint               coordinates_len);

static void      ibus_engine_cancel_hand_writing

                                             (IBusEngine         *engine,

                                              guint               n_strokes);

static void      ibus_engine_set_content_type

                                             (IBusEngine         *engine,

                                              guint               purpose,

                                              guint               hints);

static void      ibus_engine_emit_signal     (IBusEngine         *engine,

                                              const gchar        *signal_name,

                                              GVariant           *parameters);

static void      ibus_engine_dbus_property_changed

                                             (IBusEngine         *engine,

                                              const gchar        *property_name,

                                              GVariant           *value);

G_DEFINE_TYPE (IBusEngine, ibus_engine, IBUS_TYPE_SERVICE)

static const gchar introspection_xml[] =

    "<node>"

    "  <interface name='org.freedesktop.IBus.Engine'>"

    /* FIXME methods */

    "    <method name='ProcessKeyEvent'>"

    "      <arg direction='in'  type='u' name='keyval' />"

    "      <arg direction='in'  type='u' name='keycode' />"

    "      <arg direction='in'  type='u' name='state' />"

    "      <arg direction='out' type='b' />"

    "    </method>"

    "    <method name='SetCursorLocation'>"

    "      <arg direction='in'  type='i' name='x' />"

    "      <arg direction='in'  type='i' name='y' />"

    "      <arg direction='in'  type='i' name='w' />"

    "      <arg direction='in'  type='i' name='h' />"

    "    </method>"

    "    <method name='ProcessHandWritingEvent'>"

    "      <arg direction='in'  type='ad' name='coordinates' />"

    "    </method>"

    "    <method name='CancelHandWriting'>"

    "      <arg direction='in'  type='u' name='n_strokes' />"

    "    </method>"

    "    <method name='SetCapabilities'>"

    "      <arg direction='in'  type='u' name='caps' />"

    "    </method>"

    "    <method name='PropertyActivate'>"

    "      <arg direction='in'  type='s' name='name' />"

    "      <arg direction='in'  type='u' name='state' />"

    "    </method>"

    "    <method name='PropertyShow'>"

    "      <arg direction='in'  type='s' name='name' />"

    "    </method>"

    "    <method name='PropertyHide'>"

    "      <arg direction='in'  type='s' name='name' />"

    "    </method>"

    "    <method name='CandidateClicked'>"

    "      <arg direction='in'  type='u' name='index' />"

    "      <arg direction='in'  type='u' name='button' />"

    "      <arg direction='in'  type='u' name='state' />"

    "    </method>"

    "    <method name='FocusIn' />"

    "    <method name='FocusOut' />"

    "    <method name='Reset' />"

    "    <method name='Enable' />"

    "    <method name='Disable' />"

    "    <method name='PageUp' />"

    "    <method name='PageDown' />"

    "    <method name='CursorUp' />"

    "    <method name='CursorDown' />"

    "    <method name='SetSurroundingText'>"

    "      <arg direction='in'  type='v' name='text' />"

    "      <arg direction='in'  type='u' name='cursor_pos' />"

    "      <arg direction='in'  type='u' name='anchor_pos' />"

    "    </method>"

    "    <method name='PanelExtensionReceived'>"

    "      <arg direction='in'  type='v' name='event' />"

    "    </method>"

    "    <method name='PanelExtensionRegisterKeys'>"

    "      <arg direction='in'  type='v' name='data' />"

    "    </method>"

    /* FIXME signals */

    "    <signal name='CommitText'>"

    "      <arg type='v' name='text' />"

    "    </signal>"

    "    <signal name='UpdatePreeditText'>"

    "      <arg type='v' name='text' />"

    "      <arg type='u' name='cursor_pos' />"

    "      <arg type='b' name='visible' />"

    "      <arg type='u' name='mode' />"

    "    </signal>"

    "    <signal name='UpdateAuxiliaryText'>"

    "      <arg type='v' name='text' />"

    "      <arg type='b' name='visible' />"

    "    </signal>"

    "    <signal name='UpdateLookupTable'>"

    "      <arg type='v' name='table' />"

    "      <arg type='b' name='visible' />"

    "    </signal>"

    "    <signal name='RegisterProperties'>"

    "      <arg type='v' name='props' />"

    "    </signal>"

    "    <signal name='UpdateProperty'>"

    "      <arg type='v' name='prop' />"

    "    </signal>"

    "    <signal name='ForwardKeyEvent'>"

    "      <arg type='u' name='keyval' />"

    "      <arg type='u' name='keycode' />"

    "      <arg type='u' name='state' />"

    "    </signal>"

    "    <signal name='PanelExtension'>"

    "      <arg type='v' name='data' />"

    "    </signal>"

    /* FIXME properties */

    "    <property name='ContentType' type='(uu)' access='write' />"

    "  </interface>"

    "</node>";

static const guint IBUS_MODIFIER_FILTER =

        IBUS_MODIFIER_MASK & ~(

        IBUS_LOCK_MASK |  /* Caps Lock */

        IBUS_MOD2_MASK |  /* Num Lock */

        IBUS_BUTTON1_MASK |

        IBUS_BUTTON2_MASK |

        IBUS_BUTTON3_MASK |

        IBUS_BUTTON4_MASK |

        IBUS_BUTTON5_MASK |

        IBUS_SUPER_MASK |

        IBUS_HYPER_MASK |

        IBUS_META_MASK);

static void

ibus_engine_class_init (IBusEngineClass *class)

{

    GObjectClass *gobject_class = G_OBJECT_CLASS (class);

    IBusObjectClass *ibus_object_class = IBUS_OBJECT_CLASS (class);

    gobject_class->set_property =

            (GObjectSetPropertyFunc) ibus_engine_set_property;

    gobject_class->get_property =

            (GObjectGetPropertyFunc) ibus_engine_get_property;

    ibus_object_class->destroy = (IBusObjectDestroyFunc) ibus_engine_destroy;

    IBUS_SERVICE_CLASS (class)->service_method_call  =

            ibus_engine_service_method_call;

    IBUS_SERVICE_CLASS (class)->service_get_property =

            ibus_engine_service_get_property;

    IBUS_SERVICE_CLASS (class)->service_set_property =

            ibus_engine_service_set_property;

    ibus_service_class_add_interfaces (IBUS_SERVICE_CLASS (class),

                                       introspection_xml);

    class->process_key_event = ibus_engine_process_key_event;

    class->focus_in     = ibus_engine_focus_in;

    class->focus_out    = ibus_engine_focus_out;

    class->reset        = ibus_engine_reset;

    class->enable       = ibus_engine_enable;

    class->disable      = ibus_engine_disable;

    class->page_up      = ibus_engine_page_up;

    class->page_down    = ibus_engine_page_down;

    class->cursor_up    = ibus_engine_cursor_up;

    class->cursor_down  = ibus_engine_cursor_down;

    class->candidate_clicked    = ibus_engine_candidate_clicked;

    class->property_activate    = ibus_engine_property_activate;

    class->property_show        = ibus_engine_property_show;

    class->property_hide        = ibus_engine_property_hide;

    class->set_cursor_location  = ibus_engine_set_cursor_location;

    class->set_capabilities     = ibus_engine_set_capabilities;

    class->set_surrounding_text = ibus_engine_set_surrounding_text;

    class->process_hand_writing_event

                                = ibus_engine_process_hand_writing_event;

    class->cancel_hand_writing  = ibus_engine_cancel_hand_writing;

    class->set_content_type     = ibus_engine_set_content_type;

    /* install properties */

    /**

     * IBusEngine:name:

     *

     * Name of this IBusEngine.

     */

    g_object_class_install_property (gobject_class,

                    PROP_ENGINE_NAME,

                    g_param_spec_string ("engine-name",

                        "engine name",

                        "engine name",

                        "noname",

                        G_PARAM_READWRITE |

                        G_PARAM_CONSTRUCT_ONLY |

                        G_PARAM_STATIC_STRINGS));

    /* install signals */

    /**

     * IBusEngine::process-key-event:

     * @engine: An IBusEngine.

     * @keyval: Key symbol of the key press.

     * @keycode: KeyCode of the key press.

     * @state: Key modifier flags.

     *

     * Emitted when a key event is received.

     * Implement the member function IBusEngineClass::process_key_event

     * in extended class to receive this signal.

     * Both the key symbol and keycode are passed to the member function.

     * See ibus_input_context_process_key_event() for further explanation of

     * key symbol, keycode and which to use.

     *

     * Returns: %TRUE for successfully process the key; %FALSE otherwise.

     * See also:  ibus_input_context_process_key_event().

     *

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[PROCESS_KEY_EVENT] =

        g_signal_new (I_("process-key-event"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, process_key_event),

            g_signal_accumulator_true_handled, NULL,

            _ibus_marshal_BOOLEAN__UINT_UINT_UINT,

            G_TYPE_BOOLEAN,

            3,

            G_TYPE_UINT,

            G_TYPE_UINT,

            G_TYPE_UINT);

    /**

     * IBusEngine::focus-in:

     * @engine: An IBusEngine.

     *

     * Emitted when the client application get the focus.

     * Implement the member function IBusEngineClass::focus_in

     * in extended class to receive this signal.

     *

     * See also: ibus_input_context_focus_in()

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[FOCUS_IN] =

        g_signal_new (I_("focus-in"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, focus_in),

            NULL, NULL,

            _ibus_marshal_VOID__VOID,

            G_TYPE_NONE,

            0);

    /**

     * IBusEngine::focus-out:

     * @engine: An IBusEngine.

     *

     * Emitted when the client application  lost the focus.

     * Implement the member function IBusEngineClass::focus_out

     * in extended class to receive this signal.

     *

     * See also: ibus_input_context_focus_out()

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[FOCUS_OUT] =

        g_signal_new (I_("focus-out"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, focus_out),

            NULL, NULL,

            _ibus_marshal_VOID__VOID,

            G_TYPE_NONE,

            0);

    /**

     * IBusEngine::reset:

     * @engine: An IBusEngine.

     *

     * Emitted when the IME is reset.

     * Implement the member function IBusEngineClass::reset

     * in extended class to receive this signal.

     *

     * See also:  ibus_input_context_reset().

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[RESET] =

        g_signal_new (I_("reset"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, reset),

            NULL, NULL,

            _ibus_marshal_VOID__VOID,

            G_TYPE_NONE,

            0);

    /**

     * IBusEngine::enable:

     * @engine: An IBusEngine.

     *

     * Emitted when the IME is enabled.

     * Implement the member function IBusEngineClass::enable

     * in extended class to receive this signal.

     *

     * See also:  ibus_bus_set_global_engine().

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[ENABLE] =

        g_signal_new (I_("enable"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, enable),

            NULL, NULL,

            _ibus_marshal_VOID__VOID,

            G_TYPE_NONE,

            0);

    /**

     * IBusEngine::disable:

     * @engine: An IBusEngine.

     *

     * Emitted when the IME is disabled.

     * Implement the member function IBusEngineClass::disable

     * in extended class to receive this signal.

     *

     * See also:  ibus_bus_set_global_engine().

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[DISABLE] =

        g_signal_new (I_("disable"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, disable),

            NULL, NULL,

            _ibus_marshal_VOID__VOID,

            G_TYPE_NONE,

            0);

    /**

     * IBusEngine::set-cursor-location:

     * @engine: An IBusEngine.

     * @x: X coordinate of the cursor.

     * @y: Y coordinate of the cursor.

     * @w: Width of the cursor.

     * @h: Height of the cursor.

     *

     * Emitted when the location of IME is set.

     * Implement the member function IBusEngineClass::set_cursor_location

     * in extended class to receive this signal.

     *

     * See also:  ibus_input_context_set_cursor_location().

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[SET_CURSOR_LOCATION] =

        g_signal_new (I_("set-cursor-location"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, set_cursor_location),

            NULL, NULL,

            _ibus_marshal_VOID__INT_INT_INT_INT,

            G_TYPE_NONE,

            4,

            G_TYPE_INT,

            G_TYPE_INT,

            G_TYPE_INT,

            G_TYPE_INT);

    /**

     * IBusEngine::set-capabilities:

     * @engine: An IBusEngine.

     * @caps: Capabilities flags of IBusEngine, see #IBusCapabilite

     *

     * Emitted when the client application capabilities is set.

     * Implement the member function IBusEngineClass::set_capabilities

     * in extended class to receive this signal.

     *

     * See also:  ibus_input_context_set_capabilities().

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[SET_CAPABILITIES] =

        g_signal_new (I_("set-capabilities"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, set_capabilities),

            NULL, NULL,

            _ibus_marshal_VOID__UINT,

            G_TYPE_NONE,

            1,

            G_TYPE_UINT);

    /**

     * IBusEngine::page-up:

     * @engine: An IBusEngine.

     *

     * Emitted when the page-up button is pressed.

     * Implement the member function IBusEngineClass::page_up

     * in extended class to receive this signal.

     *

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[PAGE_UP] =

        g_signal_new (I_("page-up"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, page_up),

            NULL, NULL,

            _ibus_marshal_VOID__VOID,

            G_TYPE_NONE,

            0);

    /**

     * IBusEngine::page-down:

     * @engine: An IBusEngine.

     *

     * Emitted when the page-down button is pressed.

     * Implement the member function IBusEngineClass::page_down

     * in extended class to receive this signal.

     *

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[PAGE_DOWN] =

        g_signal_new (I_("page-down"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, page_down),

            NULL, NULL,

            _ibus_marshal_VOID__VOID,

            G_TYPE_NONE,

            0);

    /**

     * IBusEngine::cursor-up:

     * @engine: An IBusEngine.

     *

     * Emitted when the up cursor button is pressed.

     * Implement the member function IBusEngineClass::cursor_up

     * in extended class to receive this signal.

     *

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[CURSOR_UP] =

        g_signal_new (I_("cursor-up"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, cursor_up),

            NULL, NULL,

            _ibus_marshal_VOID__VOID,

            G_TYPE_NONE,

            0);

    /**

     * IBusEngine::cursor-down:

     * @engine: An IBusEngine.

     *

     * Emitted when the down cursor button is pressed.

     * Implement the member function IBusEngineClass::cursor_down

     * in extended class to receive this signal.

     *

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[CURSOR_DOWN] =

        g_signal_new (I_("cursor-down"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, cursor_down),

            NULL, NULL,

            _ibus_marshal_VOID__VOID,

            G_TYPE_NONE,

            0);

    /**

     * IBusEngine::candidate-clicked:

     * @engine: An IBusEngine.

     * @index:  Index of candidate be clicked.

     * @button: Mouse button.

     * @state:  Keyboard state.

     *

     * Emitted when candidate on lookup table is clicked.

     * Implement the member function IBusEngineClass::candidate_clicked

     * in extended class to receive this signal.

     *

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[CANDIDATE_CLICKED] =

        g_signal_new (I_("candidate-clicked"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, candidate_clicked),

            NULL, NULL,

            _ibus_marshal_VOID__UINT_UINT_UINT,

            G_TYPE_NONE,

            3,

            G_TYPE_UINT,

            G_TYPE_UINT,

            G_TYPE_UINT);

    /**

     * IBusEngine::property-activate:

     * @engine: An IBusEngine.

     * @name:   Property name.

     * @state:  Property state.

     *

     * Emitted when a property is activated or change changed.

     * Implement the member function IBusEngineClass::property_activate

     * in extended class to receive this signal.

     *

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[PROPERTY_ACTIVATE] =

        g_signal_new (I_("property-activate"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, property_activate),

            NULL, NULL,

            _ibus_marshal_VOID__STRING_UINT,

            G_TYPE_NONE,

            2,

            G_TYPE_STRING,

            G_TYPE_UINT);

    /**

     * IBusEngine::property-show:

     * @engine: An IBusEngine.

     * @name:   Property name.

     *

     * Emitted when a property is shown.

     * Implement the member function IBusEngineClass::property_side

     * in extended class to receive this signal.

     *

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[PROPERTY_SHOW] =

        g_signal_new (I_("property-show"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, property_show),

            NULL, NULL,

            _ibus_marshal_VOID__STRING,

            G_TYPE_NONE,

            1,

            G_TYPE_STRING);

    /**

     * IBusEngine::property-hide:

     * @engine: An IBusEngine.

     * @name:   Property name.

     *

     * Emitted when a property is hidden.

     * Implement the member function IBusEngineClass::property_hide

     * in extended class to receive this signal.

     *

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[PROPERTY_HIDE] =

        g_signal_new (I_("property-hide"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, property_hide),

            NULL, NULL,

            _ibus_marshal_VOID__STRING,

            G_TYPE_NONE,

            1,

            G_TYPE_STRING);

    /**

     * IBusEngine::process-hand-writing-event:

     * @engine: An IBusEngine.

     * @coordinates: An array of double (0.0 to 1.0) which represents a stroke (i.e. [x1, y1, x2, y2, x3, y3, ...]).

     * @coordinates_len: The number of elements in the array.

     *

     * Emitted when a hand writing operation is cancelled.

     * Implement the member function IBusEngineClass::cancel_hand_writing

     * in extended class to receive this signal.

     *

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[PROCESS_HAND_WRITING_EVENT] =

        g_signal_new (I_("process-hand-writing-event"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, process_hand_writing_event),

            NULL, NULL,

            _ibus_marshal_VOID__POINTER_UINT,

            G_TYPE_NONE,

            2,

            G_TYPE_POINTER,

            G_TYPE_UINT);

    /**

     * IBusEngine::cancel-hand-writing:

     * @engine: An IBusEngine.

     * @n_strokes: The number of strokes to be removed. 0 means "remove all".

     *

     * Emitted when a hand writing operation is cancelled.

     * Implement the member function IBusEngineClass::cancel_hand_writing

     * in extended class to receive this signal.

     *

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[CANCEL_HAND_WRITING] =

        g_signal_new (I_("cancel-hand-writing"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, cancel_hand_writing),

            NULL, NULL,

            _ibus_marshal_VOID__UINT,

            G_TYPE_NONE,

            1,

            G_TYPE_UINT);

    /**

     * IBusEngine::set-surrounding-text:

     * @engine: An IBusEngine.

     * @text: The surrounding text.

     * @cursor_pos: The cursor position on surrounding text.

     * @anchor_pos: The anchor position on selection area.

     *

     * Emitted when a surrounding text is set.

     * Implement the member function IBusEngineClass::set_surrounding_text

     * in extended class to receive this signal.

     * If anchor_pos equals to cursor_pos, it means "there are no selection"

     * or "does not support selection retrival".

     *

     * <note><para>Argument @user_data is ignored in this function.</para></note>

     */

    engine_signals[SET_SURROUNDING_TEXT] =

        g_signal_new (I_("set-surrounding-text"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, set_surrounding_text),

            NULL, NULL,

            _ibus_marshal_VOID__OBJECT_UINT_UINT,

            G_TYPE_NONE,

            3,

            G_TYPE_OBJECT,

            G_TYPE_UINT,

            G_TYPE_UINT);

    /**

     * IBusEngine::set-content-type:

     * @engine: An #IBusEngine.

     * @purpose: Primary purpose of the input context, as an #IBusInputPurpose.

     * @hints: Hints that augment @purpose, as an #IBusInputHints.

     *

     * Emitted when the client application content-type (primary

     * purpose and hints) is set.  The engine could change the

     * behavior according to the content-type.  Implement the member

     * function IBusEngineClass::set_content_type

     * in extended class to receive this signal.

     *

     * For example, if the client application wants to restrict input

     * to numbers, this signal will be emitted with @purpose set to

     * #IBUS_INPUT_PURPOSE_NUMBER, so the engine can switch the input

     * mode to latin.

     *

     * <note><para>Argument @user_data is ignored in this

     * function.</para></note>

     */

    engine_signals[SET_CONTENT_TYPE] =

        g_signal_new (I_("set-content-type"),

            G_TYPE_FROM_CLASS (gobject_class),

            G_SIGNAL_RUN_LAST,

            G_STRUCT_OFFSET (IBusEngineClass, set_content_type),

            NULL, NULL,

            _ibus_marshal_VOID__UINT_UINT,

            G_TYPE_NONE,

            2,

            G_TYPE_UINT,

            G_TYPE_UINT);

    g_type_class_add_private (class, sizeof (IBusEnginePrivate));

    text_empty = ibus_text_new_from_static_string ("");

    g_object_ref_sink (text_empty);

}

static void

ibus_engine_init (IBusEngine *engine)

{

    IBusEnginePrivate *priv;

    engine->priv = priv = IBUS_ENGINE_GET_PRIVATE (engine);

    priv->surrounding_text = g_object_ref_sink (text_empty);

    priv->extension_keybindings = g_hash_table_new_full (

            g_str_hash,

            g_str_equal,

            g_free,

            g_free);

}

static void

ibus_engine_destroy (IBusEngine *engine)

{

    IBusEnginePrivate *priv = engine->priv;

    g_clear_pointer (&priv->engine_name, g_free);

    g_clear_pointer (&priv->current_extension_name, g_free);

    if (priv->surrounding_text)

        g_clear_object (&priv->surrounding_text);

    if (priv->extension_keybindings)

        g_clear_pointer (&priv->extension_keybindings, g_hash_table_destroy);

    IBUS_OBJECT_CLASS(ibus_engine_parent_class)->destroy (IBUS_OBJECT (engine));

}

static void

ibus_engine_set_property (IBusEngine   *engine,

                          guint         prop_id,

                          const GValue *value,

                          GParamSpec   *pspec)

{

    switch (prop_id) {

    case PROP_ENGINE_NAME:

        engine->priv->engine_name = g_value_dup_string (value);

        break;

    default:

        G_OBJECT_WARN_INVALID_PROPERTY_ID (engine, prop_id, pspec);

    }

}