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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* e-text-event-processor.c
 * Copyright (C) 2000  Helix Code, Inc.
 * Author: Chris Lahey <clahey@helixcode.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

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

static void e_text_event_processor_emacs_like_init      (ETextEventProcessorEmacsLike        *card);
static void e_text_event_processor_emacs_like_class_init    (ETextEventProcessorEmacsLikeClass   *klass);
static gint e_text_event_processor_emacs_like_event (ETextEventProcessor *tep, ETextEventProcessorEvent *event);

static ETextEventProcessorClass *parent_class = NULL;

/* The arguments we take */
enum {
    ARG_0
};

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_DELETE, 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_NOP, 0, "" },           /* 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_NOP, 0, "" },           /* 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_NOP, 0, "" },           /* 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 */

};

GtkType
e_text_event_processor_emacs_like_get_type (void)
{
  static GtkType text_event_processor_emacs_like_type = 0;

  if (!text_event_processor_emacs_like_type)
    {
      static const GtkTypeInfo text_event_processor_emacs_like_info =
      {
        "ETextEventProcessorEmacsLike",
        sizeof (ETextEventProcessorEmacsLike),
        sizeof (ETextEventProcessorEmacsLikeClass),
        (GtkClassInitFunc) e_text_event_processor_emacs_like_class_init,
        (GtkObjectInitFunc) e_text_event_processor_emacs_like_init,
        /* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

      text_event_processor_emacs_like_type = gtk_type_unique (e_text_event_processor_get_type (), &text_event_processor_emacs_like_info);
    }

  return text_event_processor_emacs_like_type;
}

static void
e_text_event_processor_emacs_like_class_init (ETextEventProcessorEmacsLikeClass *klass)
{
  GtkObjectClass *object_class;
  ETextEventProcessorClass *processor_class;

  object_class = (GtkObjectClass*) klass;
  processor_class = (ETextEventProcessorClass*) klass;

  parent_class = gtk_type_class (e_text_event_processor_get_type ());

  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;
    switch (event->type) {
    case GDK_BUTTON_PRESS:
        if (event->button.button == 1) {
            command.action = E_TEP_GRAB;
            command.time = event->button.time;
            gtk_signal_emit_by_name (GTK_OBJECT (tep), "command", &command);
            if (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 = TRUE;
        }
        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;
            gtk_signal_emit_by_name (GTK_OBJECT (tep), "command", &command);
            command.time = event->button.time;
            tep_el->mouse_down = FALSE;
            command.action = E_TEP_NOP;
        } 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;
            gtk_signal_emit_by_name (GTK_OBJECT (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
                command.action = E_TEP_MOVE;
            switch(key.keyval) {
            case GDK_Home:
            case GDK_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_End:
            case GDK_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_Page_Up:
            case GDK_KP_Page_Up: command.position = E_TEP_BACKWARD_PAGE; break;

            case GDK_Page_Down:
            case GDK_KP_Page_Down: command.position = E_TEP_FORWARD_PAGE; break;
                /* CUA has Ctrl-Up/Ctrl-Down as paragraph up down */
            case GDK_Up:
            case GDK_KP_Up:        command.position = E_TEP_BACKWARD_LINE; break;

            case GDK_Down:
            case GDK_KP_Down:      command.position = E_TEP_FORWARD_LINE; break;

            case GDK_Left:
            case GDK_KP_Left:
                if (key.state & GDK_CONTROL_MASK)
                    command.position = E_TEP_BACKWARD_WORD;
                else
                    command.position = E_TEP_BACKWARD_CHARACTER;
                break;
            case GDK_Right:
            case GDK_KP_Right:
                if (key.state & GDK_CONTROL_MASK)
                    command.position = E_TEP_FORWARD_WORD;
                else
                    command.position = E_TEP_FORWARD_CHARACTER;
                break;
      
            case GDK_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_Clear:
                command.action = E_TEP_DELETE;
                command.position = E_TEP_END_OF_LINE;
                break;
            case GDK_Insert:
            case GDK_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_Delete:
            case GDK_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;
                    gtk_signal_emit_by_name (GTK_OBJECT (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_Tab:
            case GDK_KP_Tab:
            case GDK_ISO_Left_Tab:
            case GDK_3270_BackTab:
                /* Don't insert literally */
                command.action = E_TEP_NOP;
                command.position = E_TEP_SELECTION;
                break;
            case GDK_Return:
            case GDK_KP_Enter:
                if (tep->allow_newlines) {
                    command.action = E_TEP_INSERT;
                    command.position = E_TEP_SELECTION;
                    command.value = 1;
                    command.string = "\n";
                } else {
                    command.action = E_TEP_ACTIVATE;
                    command.position = E_TEP_SELECTION;
                }
                break;
            case GDK_Escape:
                /* Don't insert literally */
                command.action = E_TEP_NOP;
                command.position = E_TEP_SELECTION;
                break;

            case GDK_KP_Space:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = " ";
                break;
            case GDK_KP_Equal:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "=";
                break;
            case GDK_KP_Multiply:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "*";
                break;
            case GDK_KP_Add:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "+";
                break;
            case GDK_KP_Subtract:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "-";
                break;
            case GDK_KP_Decimal:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = ".";
                break;
            case GDK_KP_Divide:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "/";
                break;
            case GDK_KP_0:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "0";
                break;
            case GDK_KP_1:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "1";
                break;
            case GDK_KP_2:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "2";
                break;
            case GDK_KP_3:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "3";
                break;
            case GDK_KP_4:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "4";
                break;
            case GDK_KP_5:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "5";
                break;
            case GDK_KP_6:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "6";
                break;
            case GDK_KP_7:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "7";
                break;
            case GDK_KP_8:
                command.action = E_TEP_INSERT;
                command.position = E_TEP_SELECTION;
                command.value = 1;
                command.string = "8";
                break;
            case GDK_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) {
                    if ((key.keyval >= 'A') && (key.keyval <= 'Z'))
                        key.keyval -= 'A' - 'a';
                    
                    if ((key.keyval >= 'a') && (key.keyval <= 'z')) {
                        command.position = control_keys[(int) (key.keyval - 'a')].position;
                        if (control_keys[(int) (key.keyval - 'a')].action != E_TEP_MOVE)
                            command.action = control_keys[(int) (key.keyval - 'a')].action;
                        command.value = control_keys[(int) (key.keyval - 'a')].value;
                        command.string = control_keys[(int) (key.keyval - 'a')].string;
                    }

                    if (key.keyval == 'x' || key.keyval == 'w') {
                        command.action = E_TEP_COPY;
                        command.position = E_TEP_SELECTION;
                        gtk_signal_emit_by_name (GTK_OBJECT (tep), "command", &command);
                        
                        command.action = E_TEP_DELETE;
                        command.position = E_TEP_SELECTION;
                    }
                    
                    break;
                } else if (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 = alt_keys[(int) (key.keyval - 'a')].position;
                        if (alt_keys[(int) (key.keyval - 'a')].action != E_TEP_MOVE)
                            command.action = alt_keys[(int) (key.keyval - 'a')].action;
                        command.value = alt_keys[(int) (key.keyval - 'a')].value;
                        command.string = alt_keys[(int) (key.keyval - 'a')].string;
                    }
                } else if (key.length > 0) {
                    if (key.keyval >= GDK_KP_0 && key.keyval <= GDK_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) {
        gtk_signal_emit_by_name (GTK_OBJECT (tep), "command", &command);
        return 1;
    }
    else
        return 0;
}

ETextEventProcessor *
e_text_event_processor_emacs_like_new (void)
{
    ETextEventProcessorEmacsLike *retval = gtk_type_new (e_text_event_processor_emacs_like_get_type ());
    return E_TEXT_EVENT_PROCESSOR (retval);
}