path: root/e-util/e-text-event-processor-emacs-like.c

/*
 * This program 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 of the License, or (at your option) version 3.
 *
 * This program 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 the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Chris Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>

#include <gdk/gdkkeysyms.h>

#include "e-text-event-processor-emacs-like.h"

static gint e_text_event_processor_emacs_like_event
                    (ETextEventProcessor *tep,
                     ETextEventProcessorEvent *event);

G_DEFINE_TYPE (
    ETextEventProcessorEmacsLike,
    e_text_event_processor_emacs_like,
    E_TEXT_EVENT_PROCESSOR_TYPE)

static const ETextEventProcessorCommand control_keys[26] = {
    { E_TEP_START_OF_LINE,      E_TEP_MOVE, 0, "" }, /* a */
    { E_TEP_BACKWARD_CHARACTER, E_TEP_MOVE, 0, "" }, /* b */
    { E_TEP_SELECTION,          E_TEP_COPY, 0, "" }, /* c */
    { E_TEP_FORWARD_CHARACTER,  E_TEP_DELETE, 0, "" }, /* d */
    { E_TEP_END_OF_LINE,        E_TEP_MOVE, 0, "" }, /* e */
    { E_TEP_FORWARD_CHARACTER,  E_TEP_MOVE, 0, "" }, /* f */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* g */
    { E_TEP_BACKWARD_CHARACTER, E_TEP_DELETE, 0, "" }, /* h */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* i */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* j */
    { E_TEP_END_OF_LINE,        E_TEP_DELETE, 0, "" }, /* k */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* l */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* m */
    { E_TEP_FORWARD_LINE,       E_TEP_MOVE, 0, "" }, /* n */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* o */
    { E_TEP_BACKWARD_LINE,      E_TEP_MOVE, 0, "" }, /* p */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* q */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* r */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* s */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* t */
    { E_TEP_START_OF_LINE,      E_TEP_DELETE, 0, "" }, /* u */
    { E_TEP_SELECTION,          E_TEP_PASTE, 0, "" }, /* v */
    { E_TEP_SELECTION,          E_TEP_NOP, 0, "" }, /* w */
    { E_TEP_SELECTION,          E_TEP_DELETE, 0, "" }, /* x */
    { E_TEP_SELECTION,          E_TEP_PASTE, 0, "" }, /* y */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" }           /* z */
};

static const ETextEventProcessorCommand alt_keys[26] = {
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* a */
    { E_TEP_BACKWARD_WORD,      E_TEP_MOVE, 0, "" }, /* b */
    { E_TEP_SELECTION, E_TEP_CAPS, E_TEP_CAPS_TITLE, "" },/* c */
    { E_TEP_FORWARD_WORD,       E_TEP_DELETE, 0, "" }, /* d */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* e */
    { E_TEP_FORWARD_WORD,       E_TEP_MOVE, 0, "" }, /* f */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* g */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* h */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* i */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* j */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* k */
    { E_TEP_SELECTION, E_TEP_CAPS, E_TEP_CAPS_LOWER, "" },           /* l */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* m */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* n */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* o */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* p */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* q */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* r */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* s */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* t */
    { E_TEP_SELECTION, E_TEP_CAPS, E_TEP_CAPS_UPPER, "" },           /* u */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* v */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* w */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* x */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" },           /* y */
    { E_TEP_SELECTION, E_TEP_NOP, 0, "" }           /* z */

};

static void
e_text_event_processor_emacs_like_class_init (ETextEventProcessorEmacsLikeClass *class)
{
  ETextEventProcessorClass *processor_class;

  processor_class = (ETextEventProcessorClass *) class;

  processor_class->event = e_text_event_processor_emacs_like_event;
}

static void
e_text_event_processor_emacs_like_init (ETextEventProcessorEmacsLike *tep)
{
}

static gint
e_text_event_processor_emacs_like_event (ETextEventProcessor *tep,
                                         ETextEventProcessorEvent *event)
{
    ETextEventProcessorCommand command;
    ETextEventProcessorEmacsLike *tep_el = E_TEXT_EVENT_PROCESSOR_EMACS_LIKE (tep);
    command.action = E_TEP_NOP;

    /* Warning from the Intel compiler here:
     * e-text-event-processor-emacs-like.c(136): warning #589:
     *   transfer of control bypasses initialization of:
     *   variable "key" (declared at line 194)
     *  switch (event->type) {
     *  ^
     */
    switch (event->type) {
    case GDK_BUTTON_PRESS:
        if (event->button.button == 1 || event->button.button == 2) {
            command.action = E_TEP_GRAB;
            command.device = event->button.device;
            command.time = event->button.time;
            g_signal_emit_by_name (tep, "command", &command);
            if (event->button.button == 1 && event->button.state & GDK_SHIFT_MASK)
                command.action = E_TEP_SELECT;
            else
                command.action = E_TEP_MOVE;
            command.position = E_TEP_VALUE;
            command.value = event->button.position;
            command.time = event->button.time;
            tep_el->mouse_down = event->button.button == 1;
        }
        break;

    case GDK_2BUTTON_PRESS:
        if (event->button.button == 1) {
            command.action = E_TEP_SELECT;
            command.position = E_TEP_SELECT_WORD;
            command.time = event->button.time;
        }
        break;

    case GDK_3BUTTON_PRESS:
        if (event->button.button == 1) {
            command.action = E_TEP_SELECT;
            command.position = E_TEP_SELECT_ALL;
            command.time = event->button.time;
        }
        break;

    case GDK_BUTTON_RELEASE:
        if (event->button.button == 1) {
            command.action = E_TEP_UNGRAB;
            command.time = event->button.time;
            tep_el->mouse_down = FALSE;
        } else if (event->button.button == 2) {
            command.action = E_TEP_MOVE;
            command.position = E_TEP_VALUE;
            command.value = event->button.position;
            command.time = event->button.time;
            g_signal_emit_by_name (tep, "command", &command);

            command.action = E_TEP_GET_SELECTION;
            command.position = E_TEP_SELECTION;
            command.value = 0;
            command.time = event->button.time;
        }
        break;

    case GDK_MOTION_NOTIFY:
        if (tep_el->mouse_down) {
            command.action = E_TEP_SELECT;
            command.position = E_TEP_VALUE;
            command.time = event->motion.time;
            command.value = event->motion.position;
        }
        break;

    case GDK_KEY_PRESS:
        {
            ETextEventProcessorEventKey key = event->key;

            command.time = event->key.time;

            if (key.state & GDK_SHIFT_MASK)
                command.action = E_TEP_SELECT;
            else if (key.state & GDK_MOD1_MASK)
                command.action = E_TEP_NOP;
            else
                command.action = E_TEP_MOVE;

            switch (key.keyval) {
            case GDK_KEY_Home:
            case GDK_KEY_KP_Home:
                if (key.state & GDK_CONTROL_MASK)
                    command.position = E_TEP_START_OF_BUFFER;
                else
                    command.position = E_TEP_START_OF_LINE;
                break;

            case GDK_KEY_End:
            case GDK_KEY_KP_End:
                if (key.state & GDK_CONTROL_MASK)
                    command.position = E_TEP_END_OF_BUFFER;
                else
                    command.position = E_TEP_END_OF_LINE;
                break;

            case GDK_KEY_Page_Up:
            case GDK_KEY_KP_Page_Up:
                command.position = E_TEP_BACKWARD_PAGE;
                break;

            case GDK_KEY_Page_Down:
            case GDK_KEY_KP_Page_Down:
                command.position = E_TEP_FORWARD_PAGE;
                break;

            /* CUA has Ctrl-Up/Ctrl-Down as paragraph up down */
            case GDK_KEY_Up:
            case GDK_KEY_KP_Up:
                command.position = E_TEP_BACKWARD_LINE;
                break;

            case GDK_KEY_Down:
            case GDK_KEY_KP_Down:
                command.position = E_TEP_FORWARD_LINE;
                break;

            case GDK_KEY_Left:
            case GDK_KEY_KP_Left:
                if (key.state & GDK_CONTROL_MASK)
                    command.position = E_TEP_BACKWARD_WORD;
                else
                    command.position = E_TEP_BACKWARD_CHARACTER;
                break;

            case GDK_KEY_Right:
            case GDK_KEY_KP_Right:
                if (key.state & GDK_CONTROL_MASK)
                    command.position = E_TEP_FORWARD_WORD;
                else
                    command.position = E_TEP_FORWARD_CHARACTER;
                break;

            case GDK_KEY_BackSpace:
                command.action = E_TEP_DELETE;
                if (key.state & GDK_CONTROL_MASK)
                    command.position = E_TEP_BACKWARD_WORD;
                else
                    command.position = E_TEP_BACKWARD_CHARACTER;
                break;

            case GDK_KEY_Clear:
                command.action = E_TEP_DELETE;
                command.position = E_TEP_END_OF_LINE;
                break;

            case GDK_KEY_Insert:
            case GDK_KEY_KP_Insert:
                if (key.state & GDK_SHIFT_MASK) {
                    command.action = E_TEP_PASTE;
                    command.position = E_TEP_SELECTION;
                } else if (key.state & GDK_CONTROL_MASK) {
                    command.action = E_TEP_COPY;
                    command.position = E_TEP_SELECTION;
                } else {
                /* gtk_toggle_insert(text) -- IMPLEMENT -- FIXME */
                }
                break;

            case GDK_KEY_F16:
                command.action = E_TEP_COPY;
                command.position = E_TEP_SELECTION;
                break;

            case GDK_KEY_F18:
                command.action = E_TEP_PASTE;
                command.position = E_TEP_SELECTION;
                break;

            case GDK_KEY_F20:
                command.action = E_TEP_COPY;
                command.position = E_TEP_SELECTION;
                g_signal_emit_by_name (
                    tep, "command", &command);

                command.action = E_TEP_DELETE;
                command.position = E_TEP_SELECTION;
                break;

            case GDK_KEY_Delete:
            case GDK_KEY_KP_Delete:
                if (key.state & GDK_CONTROL_MASK) {
                    command.action = E_TEP_DELETE;
                    command.position = E_TEP_FORWARD_WORD;
                } else if (key.state & GDK_SHIFT_MASK) {
                    command.action = E_TEP_COPY;
                    command.position = E_TEP_SELECTION;
                    g_signal_emit_by_name (
                        tep, "command", &command);

                    command.action = E_TEP_DELETE;
                    command.position = E_TEP_SELECTION;
                } else {
                    command.action = E_TEP_DELETE;
                    command.position = E_TEP_FORWARD_CHARACTER;
                }
                break;

            case GDK_KEY_Tab:
            case GDK_KEY_KP_Tab:
            case GDK_KEY_ISO_Left_Tab:
            case GDK_KEY_3270_BackTab:
                /* Don't insert literally */
                command.action = E_TEP_NOP;
                command.position = E_TEP_SELECTION;
                break;

            case GDK_KEY_Return:
            case GDK_KEY_KP_Enter:
                if (tep->allow_newlines) {
                    if (key.state & GDK_CONTROL_MASK) {
                        command.action = E_TEP_ACTIVATE;
                        command.position = E_TEP_SELECTION;
                    } else {
                        command.action = E_TEP_INSERT;
                        command.position = E_TEP_SELECTION;
                        command.value = 1;
                        command.string = "\n";
                    }
                } else {
                    if (key.state & GDK_CONTROL_MASK) {
                        command.action = E_TEP_NOP;
                        command.position = E_TEP_SELECTION;
                    } else {
                        command.action = E_TEP_ACTIVATE;
                        command.position = E_TEP_SELECTION;
                    }
                }
                break;

            case GDK_KEY_Escape:
                /* Don't insert literally */
                command.action = E_TEP_NOP;
                command.position = E_TEP_SELECTION;
                break;

            case GDK_KEY_KP_Space:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = " ";
                break;

            case GDK_KEY_KP_Equal:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "=";
                break;

            case GDK_KEY_KP_Multiply:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "*";
                break;

            case GDK_KEY_KP_Add:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "+";
                break;

            case GDK_KEY_KP_Subtract:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "-";
                break;

            case GDK_KEY_KP_Decimal:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = ".";
                break;

            case GDK_KEY_KP_Divide:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "/";
                break;

            case GDK_KEY_KP_0:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "0";
                break;

            case GDK_KEY_KP_1:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "1";
                break;

            case GDK_KEY_KP_2:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "2";
                break;

            case GDK_KEY_KP_3:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "3";
                break;

            case GDK_KEY_KP_4:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "4";
                break;

            case GDK_KEY_KP_5:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "5";
                break;

            case GDK_KEY_KP_6:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "6";
                break;

            case GDK_KEY_KP_7:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "7";
                break;

            case GDK_KEY_KP_8:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "8";
                break;

            case GDK_KEY_KP_9:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "9";
                break;

            default:
                if ((key.state & GDK_CONTROL_MASK) &&
                   !(key.state & GDK_MOD1_MASK)) {
                    if ((key.keyval >= 'A') && (key.keyval <= 'Z'))
                        key.keyval -= 'A' - 'a';

                    if ((key.keyval >= 'a') && (key.keyval <= 'z')) {
                        command.position = control_keys[(gint) (key.keyval - 'a')].position;
                        if (control_keys[(gint) (key.keyval - 'a')].action != E_TEP_MOVE)
                            command.action = control_keys[(gint) (key.keyval - 'a')].action;
                        command.value = control_keys[(gint) (key.keyval - 'a')].value;
                        command.string = control_keys[(gint) (key.keyval - 'a')].string;
                    }

                    if (key.keyval == ' ') {
                        command.action = E_TEP_NOP;
                    }

                    if (key.keyval == 'x') {
                        command.action = E_TEP_COPY;
                        command.position = E_TEP_SELECTION;
                        g_signal_emit_by_name (tep, "command", &command);

                        command.action = E_TEP_DELETE;
                        command.position = E_TEP_SELECTION;
                    }

                    break;

                } else if ((key.state & GDK_MOD1_MASK) &&
                      !(key.state & GDK_CONTROL_MASK)) {
                    if ((key.keyval >= 'A') && (key.keyval <= 'Z'))
                        key.keyval -= 'A' - 'a';

                    if ((key.keyval >= 'a') && (key.keyval <= 'z')) {
                        command.position = alt_keys[(gint) (key.keyval - 'a')].position;
                        if (alt_keys[(gint) (key.keyval - 'a')].action != E_TEP_MOVE)
                            command.action = alt_keys[(gint) (key.keyval - 'a')].action;
                        command.value = alt_keys[(gint) (key.keyval - 'a')].value;
                        command.string = alt_keys[(gint) (key.keyval - 'a')].string;
                    }
                } else if (!(key.state & GDK_MOD1_MASK) &&
                    !(key.state & GDK_CONTROL_MASK) &&
                    key.length > 0) {
                    if (key.keyval >= GDK_KEY_KP_0 &&
                        key.keyval <= GDK_KEY_KP_9) {
                        key.keyval = '0';
                        key.string = "0";
                    }
                    command.action = E_TEP_INSERT;
                    command.position = E_TEP_SELECTION;
                    command.value = strlen (key.string);
                    command.string = key.string;

                } else {
                    command.action = E_TEP_NOP;
                }
            }
            break;

        case GDK_KEY_RELEASE:
            command.time = event->key.time;
            command.action = E_TEP_NOP;
            break;

        default:
            command.action = E_TEP_NOP;
            break;
        }
    }

    if (command.action != E_TEP_NOP) {
        g_signal_emit_by_name (tep, "command", &command);
        return 1;
    } else
        return 0;
}

ETextEventProcessor *
e_text_event_processor_emacs_like_new (void)
{
    return g_object_new (E_TEXT_EVENT_PROCESSOR_EMACS_LIKE_TYPE, NULL);
}