path: root/widgets/e-text.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* EText - Text item for evolution.
 * Copyright (C) 2000 Helix Code, Inc.
 *
 * Author: Chris Lahey <clahey@umich.edu>
 *
 * A majority of code taken from:
 *
 * Text item type for GnomeCanvas widget
 *
 * GnomeCanvas is basically a port of the Tk toolkit's most excellent
 * canvas widget.  Tk is copyrighted by the Regents of the University
 * of California, Sun Microsystems, and other parties.
 *
 * Copyright (C) 1998 The Free Software Foundation
 *
 * Author: Federico Mena <federico@nuclecu.unam.mx> */

#include <config.h>
#include <math.h>
#include <ctype.h>
#include "e-text.h"
#include <gdk/gdkx.h> /* for BlackPixel */
#include <libart_lgpl/art_affine.h>
#include <libart_lgpl/art_rgb.h>
#include <libart_lgpl/art_rgb_bitmap_affine.h>
#include <gtk/gtkinvisible.h>

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

enum {
    E_TEXT_RESIZE,
    E_TEXT_CHANGE,
    E_TEXT_LAST_SIGNAL
};

static guint e_text_signals[E_TEXT_LAST_SIGNAL] = { 0 };



/* This defines a line of text */
struct line {
    char *text; /* Line's text, it is a pointer into the text->text string */
    int length; /* Line's length in characters */
    int width;  /* Line's width in pixels */
    int ellipsis_length;  /* Length before adding ellipsis */
};



/* Object argument IDs */
enum {
    ARG_0,
    ARG_TEXT,
    ARG_X,
    ARG_Y,
    ARG_FONT,
        ARG_FONTSET,
    ARG_FONT_GDK,
    ARG_ANCHOR,
    ARG_JUSTIFICATION,
    ARG_CLIP_WIDTH,
    ARG_CLIP_HEIGHT,
    ARG_CLIP,
    ARG_X_OFFSET,
    ARG_Y_OFFSET,
    ARG_FILL_COLOR,
    ARG_FILL_COLOR_GDK,
    ARG_FILL_COLOR_RGBA,
    ARG_FILL_STIPPLE,
    ARG_TEXT_WIDTH,
    ARG_TEXT_HEIGHT,
    ARG_EDITABLE,
    ARG_USE_ELLIPSIS,
    ARG_ELLIPSIS,
    ARG_LINE_WRAP,
    ARG_MAX_LINES
};


enum {
    E_SELECTION_PRIMARY,
    E_SELECTION_CLIPBOARD
};
enum {
  TARGET_STRING,
  TARGET_TEXT,
  TARGET_COMPOUND_TEXT
};

static void e_text_class_init (ETextClass *class);
static void e_text_init (EText *text);
static void e_text_destroy (GtkObject *object);
static void e_text_set_arg (GtkObject *object, GtkArg *arg, guint arg_id);
static void e_text_get_arg (GtkObject *object, GtkArg *arg, guint arg_id);

static void e_text_update (GnomeCanvasItem *item, double *affine,
                      ArtSVP *clip_path, int flags);
static void e_text_realize (GnomeCanvasItem *item);
static void e_text_unrealize (GnomeCanvasItem *item);
static void e_text_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
                    int x, int y, int width, int height);
static double e_text_point (GnomeCanvasItem *item, double x, double y, int cx, int cy,
                       GnomeCanvasItem **actual_item);
static void e_text_bounds (GnomeCanvasItem *item,
                      double *x1, double *y1, double *x2, double *y2);
static void e_text_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf);
static gint e_text_event (GnomeCanvasItem *item, GdkEvent *event);

static void e_text_command(ETextEventProcessor *tep, ETextEventProcessorCommand *command, gpointer data);

static guint32 e_text_get_event_time (EText *text);

static void e_text_get_selection(EText *text, GdkAtom selection, guint32 time);
static void e_text_supply_selection (EText *text, guint time, GdkAtom selection, guchar *data, gint length);

static GtkWidget *e_text_get_invisible(EText *text);
static void _selection_clear_event (GtkInvisible *invisible,
                    GdkEventSelection *event,
                    EText *text);
static void _selection_get (GtkInvisible *invisible,
                GtkSelectionData *selection_data,
                guint info,
                guint time_stamp,
                EText *text);
static void _selection_received (GtkInvisible *invisible,
                 GtkSelectionData *selection_data,
                 guint time,
                 EText *text);

static ETextSuckFont *e_suck_font (GdkFont *font);
static void e_suck_font_free (ETextSuckFont *suckfont);


static GnomeCanvasItemClass *parent_class;
static GdkAtom clipboard_atom = GDK_NONE;



/**
 * e_text_get_type:
 * @void: 
 * 
 * Registers the &EText class if necessary, and returns the type ID
 * associated to it.
 * 
 * Return value: The type ID of the &EText class.
 **/
GtkType
e_text_get_type (void)
{
    static GtkType text_type = 0;

    if (!text_type) {
        GtkTypeInfo text_info = {
            "EText",
            sizeof (EText),
            sizeof (ETextClass),
            (GtkClassInitFunc) e_text_class_init,
            (GtkObjectInitFunc) e_text_init,
            NULL, /* reserved_1 */
            NULL, /* reserved_2 */
            (GtkClassInitFunc) NULL
        };

        text_type = gtk_type_unique (gnome_canvas_item_get_type (), &text_info);
    }

    return text_type;
}

/* Class initialization function for the text item */
static void
e_text_class_init (ETextClass *klass)
{
    GtkObjectClass *object_class;
    GnomeCanvasItemClass *item_class;

    object_class = (GtkObjectClass *) klass;
    item_class = (GnomeCanvasItemClass *) klass;

    parent_class = gtk_type_class (gnome_canvas_item_get_type ());

    e_text_signals[E_TEXT_RESIZE] =
        gtk_signal_new ("resize",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETextClass, resize),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);


    e_text_signals[E_TEXT_CHANGE] =
        gtk_signal_new ("change",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETextClass, change),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);


    gtk_object_class_add_signals (object_class, e_text_signals, E_TEXT_LAST_SIGNAL);
  
    gtk_object_add_arg_type ("EText::text",
                 GTK_TYPE_STRING, GTK_ARG_READWRITE, ARG_TEXT);
    gtk_object_add_arg_type ("EText::x",
                 GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_X);
    gtk_object_add_arg_type ("EText::y",
                 GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_Y);
    gtk_object_add_arg_type ("EText::font",
                 GTK_TYPE_STRING, GTK_ARG_WRITABLE, ARG_FONT);
    gtk_object_add_arg_type ("EText::fontset",
                 GTK_TYPE_STRING, GTK_ARG_WRITABLE, ARG_FONTSET);
    gtk_object_add_arg_type ("EText::font_gdk",
                 GTK_TYPE_GDK_FONT, GTK_ARG_READWRITE, ARG_FONT_GDK);
    gtk_object_add_arg_type ("EText::anchor",
                 GTK_TYPE_ANCHOR_TYPE, GTK_ARG_READWRITE, ARG_ANCHOR);
    gtk_object_add_arg_type ("EText::justification",
                 GTK_TYPE_JUSTIFICATION, GTK_ARG_READWRITE, ARG_JUSTIFICATION);
    gtk_object_add_arg_type ("EText::clip_width",
                 GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_CLIP_WIDTH);
    gtk_object_add_arg_type ("EText::clip_height",
                 GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_CLIP_HEIGHT);
    gtk_object_add_arg_type ("EText::clip",
                 GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_CLIP);
    gtk_object_add_arg_type ("EText::x_offset",
                 GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_X_OFFSET);
    gtk_object_add_arg_type ("EText::y_offset",
                 GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_Y_OFFSET);
    gtk_object_add_arg_type ("EText::fill_color",
                 GTK_TYPE_STRING, GTK_ARG_WRITABLE, ARG_FILL_COLOR);
    gtk_object_add_arg_type ("EText::fill_color_gdk",
                 GTK_TYPE_GDK_COLOR, GTK_ARG_READWRITE, ARG_FILL_COLOR_GDK);
    gtk_object_add_arg_type ("EText::fill_color_rgba",
                 GTK_TYPE_UINT, GTK_ARG_READWRITE, ARG_FILL_COLOR_RGBA);
    gtk_object_add_arg_type ("EText::fill_stipple",
                 GTK_TYPE_GDK_WINDOW, GTK_ARG_READWRITE, ARG_FILL_STIPPLE);
    gtk_object_add_arg_type ("EText::text_width",
                 GTK_TYPE_DOUBLE, GTK_ARG_READABLE, ARG_TEXT_WIDTH);
    gtk_object_add_arg_type ("EText::text_height",
                 GTK_TYPE_DOUBLE, GTK_ARG_READABLE, ARG_TEXT_HEIGHT);
    gtk_object_add_arg_type ("EText::editable",
                 GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_EDITABLE);
    gtk_object_add_arg_type ("EText::use_ellipsis",
                 GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_USE_ELLIPSIS);
    gtk_object_add_arg_type ("EText::ellipsis",
                 GTK_TYPE_STRING, GTK_ARG_READWRITE, ARG_ELLIPSIS);
    gtk_object_add_arg_type ("EText::line_wrap",
                 GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_LINE_WRAP);
    gtk_object_add_arg_type ("EText::max_lines",
                 GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_MAX_LINES);

    if (!clipboard_atom)
        clipboard_atom = gdk_atom_intern ("CLIPBOARD", FALSE);



    klass->resize = NULL;
    klass->change = NULL;

    object_class->destroy = e_text_destroy;
    object_class->set_arg = e_text_set_arg;
    object_class->get_arg = e_text_get_arg;

    item_class->update = e_text_update;
    item_class->realize = e_text_realize;
    item_class->unrealize = e_text_unrealize;
    item_class->draw = e_text_draw;
    item_class->point = e_text_point;
    item_class->bounds = e_text_bounds;
    item_class->render = e_text_render;
    item_class->event = e_text_event;
}

/* Object initialization function for the text item */
static void
e_text_init (EText *text)
{
    text->x = 0.0;
    text->y = 0.0;
    text->anchor = GTK_ANCHOR_CENTER;
    text->justification = GTK_JUSTIFY_LEFT;
    text->clip_width = 0.0;
    text->clip_height = 0.0;
    text->xofs = 0.0;
    text->yofs = 0.0;

    text->ellipsis = NULL;
    text->use_ellipsis = FALSE;
    text->ellipsis_width = 0;

    text->editable = FALSE;
    text->editing = FALSE;
    text->xofs_edit = 0;
    
    text->selection_start = 0;
    text->selection_end = 0;
    text->select_by_word = FALSE;

    text->timeout_id = 0;
    text->timer = NULL;

    text->lastx = 0;
    text->lasty = 0;
    text->last_state = 0;

    text->scroll_start = 0;
    text->show_cursor = TRUE;
    text->button_down = FALSE;
    
    text->tep = NULL;

    text->has_selection = FALSE;
    
    text->invisible = NULL;
    text->primary_selection = NULL;
    text->primary_length = 0;
    text->clipboard_selection = NULL;
    text->clipboard_length = 0;

    text->pointer_in = FALSE;
    text->default_cursor_shown = TRUE;

    text->line_wrap = FALSE;
    text->max_lines = -1;
}

/* Destroy handler for the text item */
static void
e_text_destroy (GtkObject *object)
{
    EText *text;

    g_return_if_fail (object != NULL);
    g_return_if_fail (GNOME_IS_CANVAS_TEXT (object));

    text = E_TEXT (object);

    if (text->text)
        g_free (text->text);

    if (text->tep)
        gtk_object_unref (GTK_OBJECT(text->tep));
    
    if (text->invisible)
        gtk_object_unref (GTK_OBJECT(text->invisible));

    if (text->lines)
        g_free (text->lines);

    if (text->font)
        gdk_font_unref (text->font);

    if (text->suckfont)
        e_suck_font_free (text->suckfont);

    if (text->stipple)
        gdk_bitmap_unref (text->stipple);

    if (GTK_OBJECT_CLASS (parent_class)->destroy)
        (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}

static void
get_bounds_item_relative (EText *text, double *px1, double *py1, double *px2, double *py2)
{
    GnomeCanvasItem *item;
    double x, y;
    double clip_x, clip_y;
    int old_height;

    item = GNOME_CANVAS_ITEM (text);

    x = text->x;
    y = text->y;

    clip_x = x;
    clip_y = y;

    /* Calculate text dimensions */

    old_height = text->height;

    if (text->text && text->font)
        text->height = (text->font->ascent + text->font->descent) * text->num_lines;
    else
        text->height = 0;

    if (old_height != text->height)
        gtk_signal_emit_by_name (GTK_OBJECT (text), "resize");

    /* Anchor text */

    switch (text->anchor) {
    case GTK_ANCHOR_NW:
    case GTK_ANCHOR_W:
    case GTK_ANCHOR_SW:
        break;

    case GTK_ANCHOR_N:
    case GTK_ANCHOR_CENTER:
    case GTK_ANCHOR_S:
        x -= text->max_width / 2;
        clip_x -= text->clip_width / 2;
        break;

    case GTK_ANCHOR_NE:
    case GTK_ANCHOR_E:
    case GTK_ANCHOR_SE:
        x -= text->max_width;
        clip_x -= text->clip_width;
        break;
    }

    switch (text->anchor) {
    case GTK_ANCHOR_NW:
    case GTK_ANCHOR_N:
    case GTK_ANCHOR_NE:
        break;

    case GTK_ANCHOR_W:
    case GTK_ANCHOR_CENTER:
    case GTK_ANCHOR_E:
        y -= text->height / 2;
        clip_y -= text->clip_height / 2;
        break;

    case GTK_ANCHOR_SW:
    case GTK_ANCHOR_S:
    case GTK_ANCHOR_SE:
        y -= text->height;
        clip_y -= text->clip_height;
        break;
    }

    /* Bounds */

    if (text->clip) {
        /* maybe do bbox intersection here? */
        *px1 = clip_x;
        *py1 = clip_y;
        *px2 = clip_x + text->clip_width;
        *py2 = clip_y + text->clip_height;
    } else {
        *px1 = x;
        *py1 = y;
        *px2 = x + text->max_width;
        *py2 = y + text->height;
    }
}

static void
get_bounds (EText *text, double *px1, double *py1, double *px2, double *py2)
{
    GnomeCanvasItem *item;
    double wx, wy;
    int old_height;

    item = GNOME_CANVAS_ITEM (text);

    /* Get canvas pixel coordinates for text position */

    wx = text->x;
    wy = text->y;
    gnome_canvas_item_i2w (item, &wx, &wy);
    gnome_canvas_w2c (item->canvas, wx + text->xofs, wy + text->yofs, &text->cx, &text->cy);

    /* Get canvas pixel coordinates for clip rectangle position */

    gnome_canvas_w2c (item->canvas, wx, wy, &text->clip_cx, &text->clip_cy);
    text->clip_cwidth = text->clip_width * item->canvas->pixels_per_unit;
    text->clip_cheight = text->clip_height * item->canvas->pixels_per_unit;

    /* Calculate text dimensions */

    old_height = text->height;

    if (text->text && text->font)
        text->height = (text->font->ascent + text->font->descent) * text->num_lines;
    else
        text->height = 0;

    if (old_height != text->height)
        gtk_signal_emit_by_name (GTK_OBJECT (text), "resize");

    /* Anchor text */

    switch (text->anchor) {
    case GTK_ANCHOR_NW:
    case GTK_ANCHOR_W:
    case GTK_ANCHOR_SW:
        break;

    case GTK_ANCHOR_N:
    case GTK_ANCHOR_CENTER:
    case GTK_ANCHOR_S:
        text->cx -= text->max_width / 2;
        text->clip_cx -= text->clip_cwidth / 2;
        break;

    case GTK_ANCHOR_NE:
    case GTK_ANCHOR_E:
    case GTK_ANCHOR_SE:
        text->cx -= text->max_width;
        text->clip_cx -= text->clip_cwidth;
        break;
    }

    switch (text->anchor) {
    case GTK_ANCHOR_NW:
    case GTK_ANCHOR_N:
    case GTK_ANCHOR_NE:
        break;

    case GTK_ANCHOR_W:
    case GTK_ANCHOR_CENTER:
    case GTK_ANCHOR_E:
        text->cy -= text->height / 2;
        text->clip_cy -= text->clip_cheight / 2;
        break;

    case GTK_ANCHOR_SW:
    case GTK_ANCHOR_S:
    case GTK_ANCHOR_SE:
        text->cy -= text->height;
        text->clip_cy -= text->clip_cheight;
        break;
    }

    /* Bounds */

    if (text->clip) {
        *px1 = text->clip_cx;
        *py1 = text->clip_cy;
        *px2 = text->clip_cx + text->clip_cwidth;
        *py2 = text->clip_cy + text->clip_cheight;
    } else {
        *px1 = text->cx;
        *py1 = text->cy;
        *px2 = text->cx + text->max_width;
        *py2 = text->cy + text->height;
    }
}

/* Recalculates the bounding box of the text item.  The bounding box is defined
 * by the text's extents if the clip rectangle is disabled.  If it is enabled,
 * the bounding box is defined by the clip rectangle itself.
 */
static void
recalc_bounds (EText *text)
{
    GnomeCanvasItem *item;

    item = GNOME_CANVAS_ITEM (text);

    get_bounds (text, &item->x1, &item->y1, &item->x2, &item->y2);

    gnome_canvas_group_child_bounds (GNOME_CANVAS_GROUP (item->parent), item);
}

static void
calc_ellipsis (EText *text)
{
    if (text->font)
        text->ellipsis_width = 
            gdk_text_width (text->font,
                    text->ellipsis ? text->ellipsis : "...",
                    text->ellipsis ? strlen (text->ellipsis) : 3);
}

/* Calculates the line widths (in pixels) of the text's splitted lines */
static void
calc_line_widths (EText *text)
{
    struct line *lines;
    int i;
    int j;

    lines = text->lines;
    text->max_width = 0;

    if (!lines)
        return;

    for (i = 0; i < text->num_lines; i++) {
        if (lines->length != 0) {
            if (text->font) {
                lines->width = gdk_text_width (text->font,
                                   lines->text, lines->length);
                lines->ellipsis_length = 0;
            } else {
                lines->width = 0;
            }
            
            if (text->clip && 
                text->use_ellipsis &&
                ! text->editing &&
                lines->width > text->clip_width) {
                if (text->font) {
                    lines->ellipsis_length = 0;
                    for (j = 0; j < lines->length; j++ ) {
                        if (gdk_text_width (text->font, lines->text, j) + text->ellipsis_width <= text->clip_width)
                            lines->ellipsis_length = j;
                        else
                            break;
                    }
                }
                else
                    lines->ellipsis_length = 0;
                lines->width = gdk_text_width (text->font, lines->text, lines->ellipsis_length) +
                    text->ellipsis_width;
            }
            else
                lines->ellipsis_length = lines->length;

            if (lines->width > text->max_width)
                text->max_width = lines->width;
        }

        lines++;
    }
}

/* Splits the text of the text item into lines */
static void
split_into_lines (EText *text)
{
    char *p;
    struct line *lines;
    int len;
    int line_num;
    char *laststart;
    char *lastend;
    char *linestart;

    /* Free old array of lines */

    if (text->lines)
        g_free (text->lines);

    text->lines = NULL;
    text->num_lines = 0;

    if (!text->text)
        return;

    /* First, count the number of lines */

    lastend = text->text;
    laststart = text->text;
    linestart = text->text;

    for (p = text->text; *p; p++) {
        if (text->line_wrap && (*p == ' ' || *p == '\n')) {
            if ( laststart != lastend
                 && gdk_text_width(text->font,
                           linestart,
                           p - linestart)
                 > text->clip_width ) {
                text->num_lines ++;
                linestart = laststart;
                laststart = p + 1;
                lastend = p;
            } else if (*p == ' ') {
                laststart = p + 1;
                lastend = p;
            }
        } 
        if (*p == '\n') {
            text->num_lines ++;
            lastend = p + 1;
            laststart = p + 1;
            linestart = p + 1;
        } 
    }

    if (text->line_wrap) {
        if ( laststart != lastend
             && gdk_text_width(text->font,
                       linestart,
                       p - linestart)
             > text->clip_width ) {
            text->num_lines ++;
        }
    } 

    text->num_lines++;

    if ( (!text->editing) && text->max_lines != -1 && text->num_lines > text->max_lines ) {
        text->num_lines = text->max_lines;
    }

    /* Allocate array of lines and calculate split positions */

    text->lines = lines = g_new0 (struct line, text->num_lines);
    len = 0;
    line_num = 1;
    lastend = text->text;
    laststart = text->text;

    for (p = text->text; line_num < text->num_lines && *p; p++) {
        gboolean handled = FALSE;
        if (len == 0)
            lines->text = p;
        if (text->line_wrap && (*p == ' ' || *p == '\n')) {
            if ( gdk_text_width(text->font,
                        lines->text,
                        p - lines->text)
                 > text->clip_width 
                 && laststart != lastend ) {
                lines->length = lastend - lines->text;
                lines++;
                line_num ++;
                len = p - laststart;
                lines->text = laststart;
                laststart = p + 1;
                lastend = p;
            } else if (*p == ' ') {
                laststart = p + 1;
                lastend = p;
                len ++;
            }
            handled = TRUE;
        } 
        if ( line_num >= text->num_lines )
            break;
        if (*p == '\n') {
            lines->length = p - lines->text;
            lines++;
            line_num ++;
            len = 0;
            lastend = p + 1;
            laststart = p + 1;
            handled = TRUE;
        } 
        if (!handled)
            len++;
    }

    if ( line_num < text->num_lines && text->line_wrap ) {
        if ( gdk_text_width(text->font,
                    lines->text,
                    p - lines->text)
             > text->clip_width 
             && laststart != lastend ) {
            lines->length = lastend - lines->text;
            lines++;
            line_num ++;
            len = p - laststart;
            lines->text = laststart;
            laststart = p + 1;
            lastend = p;
        }
    } 
    
    if (len == 0)
        lines->text = p;
    lines->length = strlen(lines->text);

    calc_line_widths (text);
}

/* Convenience function to set the text's GC's foreground color */
static void
set_text_gc_foreground (EText *text)
{
    GdkColor c;

    if (!text->gc)
        return;

    c.pixel = text->pixel;
    gdk_gc_set_foreground (text->gc, &c);
}

/* Sets the stipple pattern for the text */
static void
set_stipple (EText *text, GdkBitmap *stipple, int reconfigure)
{
    if (text->stipple && !reconfigure)
        gdk_bitmap_unref (text->stipple);

    text->stipple = stipple;
    if (stipple && !reconfigure)
        gdk_bitmap_ref (stipple);

    if (text->gc) {
        if (stipple) {
            gdk_gc_set_stipple (text->gc, stipple);
            gdk_gc_set_fill (text->gc, GDK_STIPPLED);
        } else
            gdk_gc_set_fill (text->gc, GDK_SOLID);
    }
}

/* Set_arg handler for the text item */
static void
e_text_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
    GnomeCanvasItem *item;
    EText *text;
    GdkColor color = { 0, 0, 0, 0, };
    GdkColor *pcolor;
    gboolean color_changed;
    int have_pixel;

    item = GNOME_CANVAS_ITEM (object);
    text = E_TEXT (object);

    color_changed = FALSE;
    have_pixel = FALSE;

    switch (arg_id) {
    case ARG_TEXT:
        if (text->text)
            g_free (text->text);

        text->text = g_strdup (GTK_VALUE_STRING (*arg));
        split_into_lines (text);
        recalc_bounds (text);
        break;

    case ARG_X:
        text->x = GTK_VALUE_DOUBLE (*arg);
        recalc_bounds (text);
        break;

    case ARG_Y:
        text->y = GTK_VALUE_DOUBLE (*arg);
        recalc_bounds (text);
        break;

    case ARG_FONT:
        if (text->font)
            gdk_font_unref (text->font);

        text->font = gdk_font_load (GTK_VALUE_STRING (*arg));

        if (item->canvas->aa) {
            if (text->suckfont)
                e_suck_font_free (text->suckfont);

            text->suckfont = e_suck_font (text->font);
        }
        
        calc_ellipsis (text);
        if ( text->line_wrap )
            split_into_lines (text);
        else
            calc_line_widths (text);
        recalc_bounds (text);
        break;

    case ARG_FONTSET:
        if (text->font)
            gdk_font_unref (text->font);

        text->font = gdk_fontset_load (GTK_VALUE_STRING (*arg));

        if (item->canvas->aa) {
            if (text->suckfont)
                e_suck_font_free (text->suckfont);

            text->suckfont = e_suck_font (text->font);
        }

        calc_ellipsis (text);
        if ( text->line_wrap )
            split_into_lines (text);
        else
            calc_line_widths (text);
        recalc_bounds (text);
        break;

    case ARG_FONT_GDK:
        if (text->font)
            gdk_font_unref (text->font);

        text->font = GTK_VALUE_BOXED (*arg);
        gdk_font_ref (text->font);

        if (item->canvas->aa) {
            if (text->suckfont)
                e_suck_font_free (text->suckfont);

            text->suckfont = e_suck_font (text->font);
        }
        calc_ellipsis (text);
        if ( text->line_wrap )
            split_into_lines (text);
        else
            calc_line_widths (text);
        recalc_bounds (text);
        break;

    case ARG_ANCHOR:
        text->anchor = GTK_VALUE_ENUM (*arg);
        recalc_bounds (text);
        break;

    case ARG_JUSTIFICATION:
        text->justification = GTK_VALUE_ENUM (*arg);
        break;

    case ARG_CLIP_WIDTH:
        text->clip_width = fabs (GTK_VALUE_DOUBLE (*arg));
        calc_ellipsis (text);
        if ( text->line_wrap )
            split_into_lines (text);
        else
            calc_line_widths (text);
        recalc_bounds (text);
        break;

    case ARG_CLIP_HEIGHT:
        text->clip_height = fabs (GTK_VALUE_DOUBLE (*arg));
        recalc_bounds (text);
        break;

    case ARG_CLIP:
        text->clip = GTK_VALUE_BOOL (*arg);
        calc_ellipsis (text);
        if ( text->line_wrap )
            split_into_lines (text);
        else
            calc_line_widths (text);
        recalc_bounds (text);
        break;

    case ARG_X_OFFSET:
        text->xofs = GTK_VALUE_DOUBLE (*arg);
        recalc_bounds (text);
        break;

    case ARG_Y_OFFSET:
        text->yofs = GTK_VALUE_DOUBLE (*arg);
        recalc_bounds (text);
        break;

        case ARG_FILL_COLOR:
        if (GTK_VALUE_STRING (*arg))
            gdk_color_parse (GTK_VALUE_STRING (*arg), &color);

        text->rgba = ((color.red & 0xff00) << 16 |
                  (color.green & 0xff00) << 8 |
                  (color.blue & 0xff00) |
                  0xff);
        color_changed = TRUE;
        break;

    case ARG_FILL_COLOR_GDK:
        pcolor = GTK_VALUE_BOXED (*arg);
        if (pcolor) {
            color = *pcolor;
            gdk_color_context_query_color (item->canvas->cc, &color);
            have_pixel = TRUE;
        }

        text->rgba = ((color.red & 0xff00) << 16 |
                  (color.green & 0xff00) << 8 |
                  (color.blue & 0xff00) |
                  0xff);
        color_changed = TRUE;
        break;

        case ARG_FILL_COLOR_RGBA:
        text->rgba = GTK_VALUE_UINT (*arg);
        color_changed = TRUE;
        break;

    case ARG_FILL_STIPPLE:
        set_stipple (text, GTK_VALUE_BOXED (*arg), FALSE);
        break;

    case ARG_EDITABLE:
        text->editable = GTK_VALUE_BOOL (*arg);
        break;

    case ARG_USE_ELLIPSIS:
        text->use_ellipsis = GTK_VALUE_BOOL (*arg);
        calc_line_widths (text);
        recalc_bounds (text);
        break;

    case ARG_ELLIPSIS:
        if (text->ellipsis)
            g_free (text->ellipsis);

        text->ellipsis = g_strdup (GTK_VALUE_STRING (*arg));
        calc_ellipsis (text);
        calc_line_widths (text);
        recalc_bounds (text);
        break;

    case ARG_LINE_WRAP:
        text->line_wrap = GTK_VALUE_BOOL (*arg);
        split_into_lines (text);
        recalc_bounds (text);
        break;

    case ARG_MAX_LINES:
        text->max_lines = GTK_VALUE_INT (*arg);
        split_into_lines (text);
        recalc_bounds (text);
        break;

    default:
        break;
    }

    if (color_changed) {
        if (have_pixel)
            text->pixel = color.pixel;
        else
            text->pixel = gnome_canvas_get_color_pixel (item->canvas, text->rgba);

        if (!item->canvas->aa)
            set_text_gc_foreground (text);

        gnome_canvas_item_request_update (item);
    }
}

/* Get_arg handler for the text item */
static void
e_text_get_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
    EText *text;
    GdkColor *color;

    text = E_TEXT (object);

    switch (arg_id) {
    case ARG_TEXT:
        GTK_VALUE_STRING (*arg) = g_strdup (text->text);
        break;

    case ARG_X:
        GTK_VALUE_DOUBLE (*arg) = text->x;
        break;

    case ARG_Y:
        GTK_VALUE_DOUBLE (*arg) = text->y;
        break;

    case ARG_FONT_GDK:
        GTK_VALUE_BOXED (*arg) = text->font;
        break;

    case ARG_ANCHOR:
        GTK_VALUE_ENUM (*arg) = text->anchor;
        break;

    case ARG_JUSTIFICATION:
        GTK_VALUE_ENUM (*arg) = text->justification;
        break;

    case ARG_CLIP_WIDTH:
        GTK_VALUE_DOUBLE (*arg) = text->clip_width;
        break;

    case ARG_CLIP_HEIGHT:
        GTK_VALUE_DOUBLE (*arg) = text->clip_height;
        break;

    case ARG_CLIP:
        GTK_VALUE_BOOL (*arg) = text->clip;
        break;

    case ARG_X_OFFSET:
        GTK_VALUE_DOUBLE (*arg) = text->xofs;
        break;

    case ARG_Y_OFFSET:
        GTK_VALUE_DOUBLE (*arg) = text->yofs;
        break;

    case ARG_FILL_COLOR_GDK:
        color = g_new (GdkColor, 1);
        color->pixel = text->pixel;
        gdk_color_context_query_color (text->item.canvas->cc, color);
        GTK_VALUE_BOXED (*arg) = color;
        break;

    case ARG_FILL_COLOR_RGBA:
        GTK_VALUE_UINT (*arg) = text->rgba;
        break;

    case ARG_FILL_STIPPLE:
        GTK_VALUE_BOXED (*arg) = text->stipple;
        break;

    case ARG_TEXT_WIDTH:
        GTK_VALUE_DOUBLE (*arg) = text->max_width / text->item.canvas->pixels_per_unit;
        break;

    case ARG_TEXT_HEIGHT:
        GTK_VALUE_DOUBLE (*arg) = text->height / text->item.canvas->pixels_per_unit;
        break;

    case ARG_EDITABLE:
        GTK_VALUE_BOOL (*arg) = text->editable;
        break;

    case ARG_USE_ELLIPSIS:
        GTK_VALUE_BOOL (*arg) = text->use_ellipsis;
        break;

    case ARG_ELLIPSIS:
        GTK_VALUE_STRING (*arg) = g_strdup (text->ellipsis);
        break;

    case ARG_LINE_WRAP:
        GTK_VALUE_BOOL (*arg) = text->line_wrap;
        break;

    case ARG_MAX_LINES:
        GTK_VALUE_INT (*arg) = text->max_lines;
        break;

    default:
        arg->type = GTK_TYPE_INVALID;
        break;
    }
}

/* Update handler for the text item */
static void
e_text_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
    EText *text;
    double x1, y1, x2, y2;
    ArtDRect i_bbox, c_bbox;
    int i;

    text = E_TEXT (item);

    if (parent_class->update)
        (* parent_class->update) (item, affine, clip_path, flags);

    if (!item->canvas->aa) {
        set_text_gc_foreground (text);
        set_stipple (text, text->stipple, TRUE);
        get_bounds (text, &x1, &y1, &x2, &y2);

        gnome_canvas_update_bbox (item, x1, y1, x2, y2);
    } else {
        /* aa rendering */
        for (i = 0; i < 6; i++)
            text->affine[i] = affine[i];
        get_bounds_item_relative (text, &i_bbox.x0, &i_bbox.y0, &i_bbox.x1, &i_bbox.y1);
        art_drect_affine_transform (&c_bbox, &i_bbox, affine);
        gnome_canvas_update_bbox (item, c_bbox.x0, c_bbox.y0, c_bbox.x1, c_bbox.y1);

    }
}

/* Realize handler for the text item */
static void
e_text_realize (GnomeCanvasItem *item)
{
    EText *text;

    text = E_TEXT (item);

    if (parent_class->realize)
        (* parent_class->realize) (item);

    text->gc = gdk_gc_new (item->canvas->layout.bin_window);
    
    text->i_cursor = gdk_cursor_new (GDK_XTERM);
    text->default_cursor = gdk_cursor_new (GDK_LEFT_PTR);
}

/* Unrealize handler for the text item */
static void
e_text_unrealize (GnomeCanvasItem *item)
{
    EText *text;

    text = E_TEXT (item);

    gdk_gc_unref (text->gc);
    text->gc = NULL;

    gdk_cursor_destroy (text->i_cursor);
    gdk_cursor_destroy (text->default_cursor);

    if (parent_class->unrealize)
        (* parent_class->unrealize) (item);
}

/* Calculates the x position of the specified line of text, based on the text's justification */
static double
get_line_xpos_item_relative (EText *text, struct line *line)
{
    double x;

    x = text->x;

    switch (text->anchor) {
    case GTK_ANCHOR_NW:
    case GTK_ANCHOR_W:
    case GTK_ANCHOR_SW:
        break;

    case GTK_ANCHOR_N:
    case GTK_ANCHOR_CENTER:
    case GTK_ANCHOR_S:
        x -= text->max_width / 2;
        break;

    case GTK_ANCHOR_NE:
    case GTK_ANCHOR_E:
    case GTK_ANCHOR_SE:
        x -= text->max_width;
        break;
    }

    switch (text->justification) {
    case GTK_JUSTIFY_RIGHT:
        x += text->max_width - line->width;
        break;

    case GTK_JUSTIFY_CENTER:
        x += (text->max_width - line->width) * 0.5;
        break;

    default:
        /* For GTK_JUSTIFY_LEFT, we don't have to do anything.  We do not support
         * GTK_JUSTIFY_FILL, yet.
         */
        break;
    }

    return x;
}

/* Calculates the y position of the first line of text. */
static double
get_line_ypos_item_relative (EText *text)
{
    double y;

    y = text->y;

    switch (text->anchor) {
    case GTK_ANCHOR_NW:
    case GTK_ANCHOR_N:
    case GTK_ANCHOR_NE:
        break;

    case GTK_ANCHOR_W:
    case GTK_ANCHOR_CENTER:
    case GTK_ANCHOR_E:
        y -= text->height / 2;
        break;

    case GTK_ANCHOR_SW:
    case GTK_ANCHOR_S:
    case GTK_ANCHOR_SE:
        y -= text->height;
        break;
    }

    return y;
}

/* Calculates the x position of the specified line of text, based on the text's justification */
static int
get_line_xpos (EText *text, struct line *line)
{
    int x;

    x = text->cx;

    switch (text->justification) {
    case GTK_JUSTIFY_RIGHT:
        x += text->max_width - line->width;
        break;

    case GTK_JUSTIFY_CENTER:
        x += (text->max_width - line->width) / 2;
        break;

    default:
        /* For GTK_JUSTIFY_LEFT, we don't have to do anything.  We do not support
         * GTK_JUSTIFY_FILL, yet.
         */
        break;
    }

    return x;
}

static void
_get_tep(EText *text)
{
    if (!text->tep) {
        text->tep = e_text_event_processor_emacs_like_new();
        gtk_object_ref (GTK_OBJECT (text->tep));
        gtk_object_sink (GTK_OBJECT (text->tep));
        gtk_signal_connect(GTK_OBJECT(text->tep),
                   "command",
                   GTK_SIGNAL_FUNC(e_text_command),
                   (gpointer) text);
    }
}

/* Draw handler for the text item */
static void
e_text_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
            int x, int y, int width, int height)
{
    EText *text;
    GdkRectangle rect, *clip_rect;
    struct line *lines;
    int i;
    int xpos, ypos;
    int start_char, end_char;
    int sel_start, sel_end;
    GdkRectangle sel_rect;
    GdkGC *fg_gc;
    GnomeCanvas *canvas;

    text = E_TEXT (item);
    canvas = GNOME_CANVAS_ITEM(text)->canvas;

    fg_gc = GTK_WIDGET(canvas)->style->fg_gc[text->has_selection ? GTK_STATE_SELECTED : GTK_STATE_ACTIVE];

    if (!text->text || !text->font)
        return;

    clip_rect = NULL;
    if (text->clip) {
        rect.x = text->clip_cx - x;
        rect.y = text->clip_cy - y;
        rect.width = text->clip_cwidth;
        rect.height = text->clip_cheight;
        
        gdk_gc_set_clip_rectangle (text->gc, &rect);
        gdk_gc_set_clip_rectangle (fg_gc, &rect);
        clip_rect = &rect;
    }
    lines = text->lines;
    ypos = text->cy + text->font->ascent;

    if (text->stipple)
        gnome_canvas_set_stipple_origin (item->canvas, text->gc);

    for (i = 0; i < text->num_lines; i++) {
        xpos = get_line_xpos (text, lines);
        if (text->editing) {
            xpos -= text->xofs_edit;
            start_char = lines->text - text->text;
            end_char = start_char + lines->length;
            sel_start = text->selection_start;
            sel_end = text->selection_end;
            if (sel_start > sel_end ) {
                sel_start ^= sel_end;
                sel_end ^= sel_start;
                sel_start ^= sel_end;
            }
            if ( sel_start < start_char )
                sel_start = start_char;
            if ( sel_end > end_char )
                sel_end = end_char;
            if ( sel_start < sel_end ) {
                sel_rect.x = xpos - x + gdk_text_width (text->font,
                                    lines->text,
                                    sel_start - start_char);
                sel_rect.y = ypos - y - text->font->ascent;
                sel_rect.width = gdk_text_width (text->font,
                                 lines->text + sel_start - start_char,
                                 sel_end - sel_start);
                sel_rect.height = text->font->ascent + text->font->descent;
                gtk_paint_flat_box(GTK_WIDGET(item->canvas)->style,
                           drawable,
                           text->has_selection ?
                           GTK_STATE_SELECTED :
                           GTK_STATE_ACTIVE,
                           GTK_SHADOW_NONE,
                           clip_rect,
                           GTK_WIDGET(item->canvas),
                           "text",
                           sel_rect.x,
                           sel_rect.y,
                           sel_rect.width,
                           sel_rect.height);
                gdk_draw_text (drawable,
                           text->font,
                           text->gc,
                           xpos - x,
                           ypos - y,
                           lines->text,
                           sel_start - start_char);
                gdk_draw_text (drawable,
                           text->font,
                           fg_gc,
                           xpos - x + gdk_text_width (text->font,
                                      lines->text,
                                      sel_start - start_char),
                           ypos - y,
                           lines->text + sel_start - start_char,
                           sel_end - sel_start);
                gdk_draw_text (drawable,
                           text->font,
                           text->gc,
                           xpos - x + gdk_text_width (text->font,
                                      lines->text,
                                      sel_end - start_char),
                           ypos - y,
                           lines->text + sel_end - start_char,
                           end_char - sel_end);
            } else {
                gdk_draw_text (drawable,
                           text->font,
                           text->gc,
                           xpos - x,
                           ypos - y,
                           lines->text,
                           lines->length);
            }
            if (text->selection_start == text->selection_end &&
                text->selection_start >= start_char &&
                text->selection_start <= end_char &&
                text->show_cursor) {
                gdk_draw_rectangle (drawable,
                            text->gc,
                            TRUE,
                            xpos - x + gdk_text_width (text->font, 
                                           lines->text,
                                           sel_start - start_char),
                            ypos - y - text->font->ascent,
                            1,
                            text->font->ascent + text->font->descent);
            }
        } else {
            if ( text->clip && text->use_ellipsis && lines->ellipsis_length < lines->length) {
                gdk_draw_text (drawable,
                           text->font,
                           text->gc,
                           xpos - x,
                           ypos - y,
                           lines->text,
                           lines->ellipsis_length);
                gdk_draw_text (drawable,
                           text->font,
                           text->gc,
                           xpos - x + 
                           lines->width - text->ellipsis_width,
                           ypos - y,
                           text->ellipsis ? text->ellipsis : "...",
                           text->ellipsis ? strlen (text->ellipsis) : 3);
            } else
                    
                gdk_draw_text (drawable,
                           text->font,
                           text->gc,
                           xpos - x,
                           ypos - y,
                           lines->text,
                           lines->length);
        }

        ypos += text->font->ascent + text->font->descent;
        lines++;
    }

    if (text->clip) {
        gdk_gc_set_clip_rectangle (text->gc, NULL);
        gdk_gc_set_clip_rectangle (fg_gc, NULL);
    }
}

/* Render handler for the text item */
static void
e_text_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf)
{
    EText *text;
    guint32 fg_color;
    double xpos, ypos;
    struct line *lines;
    int i, j;
    double affine[6];
    ETextSuckFont *suckfont;
    int dx, dy;
    ArtPoint start_i, start_c;

    text = E_TEXT (item);

    if (!text->text || !text->font || !text->suckfont)
        return;

    suckfont = text->suckfont;

    fg_color = text->rgba;

        gnome_canvas_buf_ensure_buf (buf);

    lines = text->lines;
    start_i.y = get_line_ypos_item_relative (text);

    art_affine_scale (affine, item->canvas->pixels_per_unit, item->canvas->pixels_per_unit);
    for (i = 0; i < 6; i++)
        affine[i] = text->affine[i];

    for (i = 0; i < text->num_lines; i++) {
        if (lines->length != 0) {
            start_i.x = get_line_xpos_item_relative (text, lines);
            art_affine_point (&start_c, &start_i, text->affine);
            xpos = start_c.x;
            ypos = start_c.y;

            for (j = 0; j < lines->length; j++) {
                ETextSuckChar *ch;

                ch = &suckfont->chars[(unsigned char)((lines->text)[j])];

                affine[4] = xpos;
                affine[5] = ypos;
                art_rgb_bitmap_affine (
                    buf->buf,
                    buf->rect.x0, buf->rect.y0, buf->rect.x1, buf->rect.y1,
                    buf->buf_rowstride,
                    suckfont->bitmap + (ch->bitmap_offset >> 3),
                    ch->width,
                    suckfont->bitmap_height,
                    suckfont->bitmap_width >> 3,
                    fg_color,
                    affine,
                    ART_FILTER_NEAREST, NULL);

                dx = ch->left_sb + ch->width + ch->right_sb;
                xpos += dx * affine[0];
                ypos += dx * affine[1];
            }
        }

        dy = text->font->ascent + text->font->descent;
        start_i.y += dy;
        lines++;
    }

    buf->is_bg = 0;
}

/* Point handler for the text item */
static double
e_text_point (GnomeCanvasItem *item, double x, double y,
             int cx, int cy, GnomeCanvasItem **actual_item)
{
    EText *text;
    int i;
    struct line *lines;
    int x1, y1, x2, y2;
    int font_height;
    int dx, dy;
    double dist, best;

    text = E_TEXT (item);

    *actual_item = item;

    /* The idea is to build bounding rectangles for each of the lines of
     * text (clipped by the clipping rectangle, if it is activated) and see
     * whether the point is inside any of these.  If it is, we are done.
     * Otherwise, calculate the distance to the nearest rectangle.
     */

    if (text->font)
        font_height = text->font->ascent + text->font->descent;
    else
        font_height = 0;

    best = 1.0e36;

    lines = text->lines;

    for (i = 0; i < text->num_lines; i++) {
        /* Compute the coordinates of rectangle for the current line,
         * clipping if appropriate.
         */

        x1 = get_line_xpos (text, lines);
        y1 = text->cy + i * font_height;
        x2 = x1 + lines->width;
        y2 = y1 + font_height;

        if (text->clip) {
            if (x1 < text->clip_cx)
                x1 = text->clip_cx;

            if (y1 < text->clip_cy)
                y1 = text->clip_cy;

            if (x2 > (text->clip_cx + text->clip_width))
                x2 = text->clip_cx + text->clip_width;

            if (y2 > (text->clip_cy + text->clip_height))
                y2 = text->clip_cy + text->clip_height;

            if ((x1 >= x2) || (y1 >= y2))
                continue;
        }

        /* Calculate distance from point to rectangle */

        if (cx < x1)
            dx = x1 - cx;
        else if (cx >= x2)
            dx = cx - x2 + 1;
        else
            dx = 0;

        if (cy < y1)
            dy = y1 - cy;
        else if (cy >= y2)
            dy = cy - y2 + 1;
        else
            dy = 0;

        if ((dx == 0) && (dy == 0))
            return 0.0;

        dist = sqrt (dx * dx + dy * dy);
        if (dist < best)
            best = dist;

        /* Next! */

        lines++;
    }

    return best / item->canvas->pixels_per_unit;
}

/* Bounds handler for the text item */
static void
e_text_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
{
    EText *text;
    double width, height;

    text = E_TEXT (item);

    *x1 = text->x;
    *y1 = text->y;

    if (text->clip) {
        width = text->clip_width;
        height = text->clip_height;
    } else {
        width = text->max_width / item->canvas->pixels_per_unit;
        height = text->height / item->canvas->pixels_per_unit;
    }

    switch (text->anchor) {
    case GTK_ANCHOR_NW:
    case GTK_ANCHOR_W:
    case GTK_ANCHOR_SW:
        break;

    case GTK_ANCHOR_N:
    case GTK_ANCHOR_CENTER:
    case GTK_ANCHOR_S:
        *x1 -= width / 2.0;
        break;

    case GTK_ANCHOR_NE:
    case GTK_ANCHOR_E:
    case GTK_ANCHOR_SE:
        *x1 -= width;
        break;
    }

    switch (text->anchor) {
    case GTK_ANCHOR_NW:
    case GTK_ANCHOR_N:
    case GTK_ANCHOR_NE:
        break;

    case GTK_ANCHOR_W:
    case GTK_ANCHOR_CENTER:
    case GTK_ANCHOR_E:
        *y1 -= height / 2.0;
        break;

    case GTK_ANCHOR_SW:
    case GTK_ANCHOR_S:
    case GTK_ANCHOR_SE:
        *y1 -= height;
        break;
    }

    *x2 = *x1 + width;
    *y2 = *y1 + height;
}

static void
_get_xy_from_position (EText *text, gint position, gint *xp, gint *yp)
{
    if (xp || yp) {
        struct line *lines;
        int x, y;
        int j;
        x = get_line_xpos (text, lines);
        y = text->cy;
        for (j = 0, lines = text->lines; j < text->num_lines; lines++, j++) {
            if (lines->text > text->text + position)
                break;
            y += text->font->ascent + text->font->descent;
        }
        lines --;
        y -= text->font->descent;
        
        x += gdk_text_width (text->font,
                     lines->text,
                     position - (lines->text - text->text));
        x -= text->xofs_edit;
        if (xp)
            *xp = x;
        if (yp)
            *yp = y;
    }
}

static gint
_get_position_from_xy (EText *text, gint x, gint y)
{
    int i, j;
    int ypos = text->cy;
    int xpos;
    struct line *lines;
    j = 0;
    while (y > ypos) {
        ypos += text->font->ascent + text->font->descent;
        j ++;
    }
    j--;
    if (j >= text->num_lines)
        j = text->num_lines - 1;
    if (j < 0)
        j = 0;
    i = 0;
    lines = text->lines;
    lines += j;
    x += text->xofs_edit;
    xpos = get_line_xpos (text, lines);
    for(i = 0; i < lines->length; i++) {
        int charwidth = gdk_text_width(text->font,
                           lines->text + i,
                           1);
        xpos += charwidth / 2;
        if (xpos > x) {
            break;
        }
        xpos += (charwidth + 1) / 2;
    }
    return lines->text + i - text->text;
}

#define SCROLL_WAIT_TIME 30000

static gboolean
_blink_scroll_timeout (gpointer data)
{
    EText *text = E_TEXT(data);
    gulong current_time;
    gboolean scroll = FALSE;
    gboolean redraw = FALSE;
    
    g_timer_elapsed(text->timer, &current_time);

    if (text->scroll_start + SCROLL_WAIT_TIME > 1000000) {
        if (current_time > text->scroll_start - (1000000 - SCROLL_WAIT_TIME) &&
            current_time < text->scroll_start)
            scroll = TRUE;
    } else {
        if (current_time > text->scroll_start + SCROLL_WAIT_TIME ||
            current_time < text->scroll_start)
            scroll = TRUE;
    }
    if (scroll && text->button_down) {
        if (text->lastx - text->clip_cx > text->clip_cwidth &&
            text->xofs_edit < text->max_width - text->clip_cwidth) {
            text->xofs_edit += 4;
            if (text->xofs_edit > text->max_width - text->clip_cwidth + 1)
                text->xofs_edit = text->max_width - text->clip_cwidth + 1;
            redraw = TRUE;
        }
        if (text->lastx - text->clip_cx < 0 &&
            text->xofs_edit > 0) {
            text->xofs_edit -= 4;
            if (text->xofs_edit < 0)
                text->xofs_edit = 0;
            redraw = TRUE;
        }
        if (redraw) {
            ETextEventProcessorEvent e_tep_event;
            e_tep_event.type = GDK_MOTION_NOTIFY;
            e_tep_event.motion.state = text->last_state;
            e_tep_event.motion.time = 0;
            e_tep_event.motion.position = _get_position_from_xy(text, text->lastx, text->lasty);
            _get_tep(text);
            e_text_event_processor_handle_event (text->tep,
                                 &e_tep_event);
            text->scroll_start = current_time;
        }
    }

    if (!((current_time / 500000) % 2)) {
        if (!text->show_cursor)
            redraw = TRUE;
        text->show_cursor = TRUE;
    } else {
        if (text->show_cursor)
            redraw = TRUE;
        text->show_cursor = FALSE;
    }
    if (redraw)
        gnome_canvas_item_request_update (GNOME_CANVAS_ITEM(text));
    return TRUE;
}

static gint
e_text_event (GnomeCanvasItem *item, GdkEvent *event)
{
    EText *text = E_TEXT(item);
    ETextEventProcessorEvent e_tep_event;

    gint return_val = 0;

    e_tep_event.type = event->type;
    switch (event->type) {
    case GDK_FOCUS_CHANGE:
        if (text->editable) {
            GdkEventFocus *focus_event;
            focus_event = (GdkEventFocus *) event;
            if (focus_event->in) {
                if(!text->editing) {
                    text->editing = TRUE;
                    if ( text->pointer_in ) {
                        if ( text->default_cursor_shown ) {
                            gdk_window_set_cursor(GTK_WIDGET(item->canvas)->window, text->i_cursor);
                            text->default_cursor_shown = FALSE;
                        }
                    }
                    text->selection_start = 0;
                    text->selection_end = 0;
                    text->select_by_word = FALSE;
                    text->xofs_edit = 0;
                    if (text->timeout_id == 0)
                        text->timeout_id = g_timeout_add(10, _blink_scroll_timeout, text);
                    text->timer = g_timer_new();
                    g_timer_elapsed(text->timer, &(text->scroll_start));
                    g_timer_start(text->timer);
                }
            } else {
                text->editing = FALSE;
                if ( ! text->default_cursor_shown ) {
                    gdk_window_set_cursor(GTK_WIDGET(item->canvas)->window, text->default_cursor);
                    text->default_cursor_shown = TRUE;
                }
                if (text->timeout_id) {
                    g_source_remove(text->timeout_id);
                    text->timeout_id = 0;
                }
                if (text->timer) {
                    g_timer_stop(text->timer);
                    g_timer_destroy(text->timer);
                    text->timer = NULL;
                }
            }
            if ( text->line_wrap )
                split_into_lines (text);
            else
                calc_line_widths (text);
            recalc_bounds (text);
        }
        return_val = 0;
        break;
    case GDK_KEY_PRESS: /* Fall Through */
    case GDK_KEY_RELEASE:
        if (text->editing) {
            GdkEventKey key = event->key;
            e_tep_event.key.time = key.time;
            e_tep_event.key.state = key.state;
            e_tep_event.key.keyval = key.keyval;
            e_tep_event.key.length = key.length;
            e_tep_event.key.string = key.string;
            _get_tep(text);
            return e_text_event_processor_handle_event (text->tep,
                                    &e_tep_event);
        }
        else
            return 0;
        break;
    case GDK_BUTTON_PRESS: /* Fall Through */
    case GDK_BUTTON_RELEASE:
        if (text->editing) {
            GdkEventButton button = event->button;
            e_tep_event.button.time = button.time;
            e_tep_event.button.state = button.state;
            e_tep_event.button.button = button.button;
            e_tep_event.button.position = _get_position_from_xy(text, button.x, button.y);
            _get_tep(text);
            return_val = e_text_event_processor_handle_event (text->tep,
                                      &e_tep_event);
            if (event->button.button == 1) {
                if (event->type == GDK_BUTTON_PRESS)
                    text->button_down = TRUE;
                else
                    text->button_down = FALSE;
            }
            text->lastx = button.x;
            text->lasty = button.y;
            text->last_state = button.state;
        } else if (text->editable && event->type == GDK_BUTTON_RELEASE && event->button.button == 1) {
            gnome_canvas_item_grab_focus (item);
            return 1;
        }
        break;
    case GDK_MOTION_NOTIFY:
        if (text->editing) {
            GdkEventMotion motion = event->motion;
            e_tep_event.motion.time = motion.time;
            e_tep_event.motion.state = motion.state;
            e_tep_event.motion.position = _get_position_from_xy(text, motion.x, motion.y);
            _get_tep(text);
            return_val = e_text_event_processor_handle_event (text->tep,
                                       &e_tep_event);
            text->lastx = motion.x;
            text->lasty = motion.y;
            text->last_state = motion.state;
        }
        break;
    case GDK_ENTER_NOTIFY:
        text->pointer_in = TRUE;
        if (text->editing) {
            if ( text->default_cursor_shown ) {
                gdk_window_set_cursor(GTK_WIDGET(item->canvas)->window, text->i_cursor);
                text->default_cursor_shown = FALSE;
            }
        }
        break;
    case GDK_LEAVE_NOTIFY:
        text->pointer_in = FALSE;
        if (text->editing) {
            if ( ! text->default_cursor_shown ) {
                gdk_window_set_cursor(GTK_WIDGET(item->canvas)->window, text->default_cursor);
                text->default_cursor_shown = TRUE;
            }
        }
        break;
    default:
        break;
    }
    if (return_val)
        return return_val;
    if (GNOME_CANVAS_ITEM_CLASS(parent_class)->event)
        return GNOME_CANVAS_ITEM_CLASS(parent_class)->event(item, event);
    else
        return 0;
}

static int
_get_position(EText *text, ETextEventProcessorCommand *command)
{
    int i;
    int length;
    int x, y;
    
    switch (command->position) {
        
    case E_TEP_VALUE:
        return command->value;

    case E_TEP_SELECTION:
        return text->selection_end;

    case E_TEP_START_OF_BUFFER:
        return 0;
    case E_TEP_END_OF_BUFFER:
        return strlen(text->text);

    case E_TEP_START_OF_LINE:
        for (i = text->selection_end - 2; i > 0; i--)
            if (text->text[i] == '\n') {
                i++;
                break;
            }
        return i;
    case E_TEP_END_OF_LINE:
        length = strlen(text->text);
        for (i = text->selection_end + 1; i < length; i++)
            if (text->text[i] == '\n') {
                break;
            }
        if (i > length)
            i = length;
        return i;

    case E_TEP_FORWARD_CHARACTER:
        length = strlen(text->text);
        i = text->selection_end + 1;
        if (i > length)
            i = length;
        return i;
    case E_TEP_BACKWARD_CHARACTER:
        i = text->selection_end - 1;
        if (i < 0)
            i = 0;
        return i;

    case E_TEP_FORWARD_WORD:
        length = strlen(text->text);
        for (i = text->selection_end + 1; i < length; i++)
            if (isspace(text->text[i])) {
                break;
            }
        if (i > length)
            i = length;
        return i;
    case E_TEP_BACKWARD_WORD:
        for (i = text->selection_end - 2; i > 0; i--)
            if (isspace(text->text[i])) {
                i++;
                break;
            }
        if (i < 0)
            i = 0;
        return i;

    case E_TEP_FORWARD_LINE:
        _get_xy_from_position(text, text->selection_end, &x, &y);
        y += text->font->ascent + text->font->descent;
        return _get_position_from_xy(text, x, y);
    case E_TEP_BACKWARD_LINE:
        _get_xy_from_position(text, text->selection_end, &x, &y);
        y -= text->font->ascent + text->font->descent;
        return _get_position_from_xy(text, x, y);

    case E_TEP_FORWARD_PARAGRAPH:
    case E_TEP_BACKWARD_PARAGRAPH:
        
    case E_TEP_FORWARD_PAGE:
    case E_TEP_BACKWARD_PAGE:
        return text->selection_end;
    default:
        return text->selection_end;
        }
}

static void
_delete_selection(EText *text)
{
    gint length = strlen(text->text);
    if (text->selection_end == text->selection_start)
        return;
    if (text->selection_end < text->selection_start) {
        text->selection_end ^= text->selection_start;
        text->selection_start ^= text->selection_end;
        text->selection_end ^= text->selection_start;
    }
    memmove( text->text + text->selection_start,
         text->text + text->selection_end,
         length - text->selection_end + 1 );
    length -= text->selection_end - text->selection_start;
    text->selection_end = text->selection_start;
}

static void
_insert(EText *text, char *string, int value)
{
    if (value > 0) {
        char *temp;
        gint length = strlen(text->text);
        temp = g_new(gchar, length + value + 1);
        strncpy(temp, text->text, text->selection_start);
        strncpy(temp + text->selection_start, string, value);
        strcpy(temp + text->selection_start + value, text->text + text->selection_start);
        g_free(text->text);
        text->text = temp;
        text->selection_start += value;
        text->selection_end = text->selection_start;
    }
}

static void
e_text_command(ETextEventProcessor *tep, ETextEventProcessorCommand *command, gpointer data)
{
    EText *text = E_TEXT(data);
    int sel_start, sel_end;
    switch (command->action) {
    case E_TEP_MOVE:
        text->selection_start = _get_position(text, command);
        text->selection_end = text->selection_start;
        if (text->timer) {
            g_timer_reset(text->timer);
        }
        break;
    case E_TEP_SELECT:
        text->selection_end = _get_position(text, command);
        sel_start = MIN(text->selection_start, text->selection_end);
        sel_end = MAX(text->selection_start, text->selection_end);
        if (sel_start != sel_end) {
            e_text_supply_selection (text, command->time, GDK_SELECTION_PRIMARY, text->text + sel_start, sel_end - sel_start);
        } else if (text->timer) {
            g_timer_reset(text->timer);
        }
        break;
    case E_TEP_DELETE:
        if (text->selection_end == text->selection_start) {
            text->selection_end = _get_position(text, command);
        }
        _delete_selection(text);
        split_into_lines (text);
        recalc_bounds (text);
        if (text->timer) {
            g_timer_reset(text->timer);
        }
        break;

    case E_TEP_INSERT:
        if (text->selection_end != text->selection_start) {
            _delete_selection(text);
        }
        _insert(text, command->string, command->value);
        split_into_lines (text);
        recalc_bounds (text);
        if (text->timer) {
            g_timer_reset(text->timer);
        }
        break;
    case E_TEP_COPY:
        sel_start = MIN(text->selection_start, text->selection_end);
        sel_end = MAX(text->selection_start, text->selection_end);
        if (sel_start != sel_end) {
            e_text_supply_selection (text, command->time, clipboard_atom, text->text + sel_start, sel_end - sel_start);
        }
        if (text->timer) {
            g_timer_reset(text->timer);
        }
        break;
    case E_TEP_PASTE:
        e_text_get_selection (text, clipboard_atom, command->time);
        if (text->timer) {
            g_timer_reset(text->timer);
        }
        break;
    case E_TEP_GET_SELECTION:
        e_text_get_selection (text, GDK_SELECTION_PRIMARY, command->time);
        break;
    case E_TEP_ACTIVATE:
        if (text->timer) {
            g_timer_reset(text->timer);
        }
        break;
    case E_TEP_SET_SELECT_BY_WORD:
        text->select_by_word = command->value;
        break;
    case E_TEP_GRAB:
        gnome_canvas_item_grab (GNOME_CANVAS_ITEM(text), 
                    GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK,
                    text->i_cursor,
                    command->time);
        break;
    case E_TEP_UNGRAB:
        gnome_canvas_item_ungrab (GNOME_CANVAS_ITEM(text), command->time);
        break;
    case E_TEP_NOP:
        break;
    }

    if (!text->button_down) {
        int x;
        int i;
        struct line *lines = text->lines;
        for (lines = text->lines, i = 0; i < text->num_lines ; i++, lines ++) {
            if (lines->text - text->text > text->selection_end) {
                break;
            }
        }
        lines --;
        x = gdk_text_width(text->font,
                   lines->text, 
                   text->selection_end - (lines->text - text->text));
        

        if (x < text->xofs_edit) {
            text->xofs_edit = x;
        }

        if (2 + x - text->clip_width > text->xofs_edit) {
            text->xofs_edit = 2 + x - text->clip_width;
        }
    }

    gnome_canvas_item_request_update (GNOME_CANVAS_ITEM(text));
}

static void _invisible_destroy (GtkInvisible *invisible,
                EText *text)
{
    text->invisible = NULL;
}

static GtkWidget *e_text_get_invisible(EText *text)
{   
    GtkWidget *invisible;
    if (text->invisible) {
        invisible = text->invisible;
    } else {
        invisible = gtk_invisible_new();
        text->invisible = invisible;
        
        gtk_selection_add_target (invisible,
                      GDK_SELECTION_PRIMARY,
                      GDK_SELECTION_TYPE_STRING,
                      E_SELECTION_PRIMARY);
        gtk_selection_add_target (invisible,
                      clipboard_atom,
                      GDK_SELECTION_TYPE_STRING,
                      E_SELECTION_CLIPBOARD);
        
        gtk_signal_connect (GTK_OBJECT(invisible), "selection_get",
                    GTK_SIGNAL_FUNC (_selection_get), 
                    text);
        gtk_signal_connect (GTK_OBJECT(invisible), "selection_clear_event",
                    GTK_SIGNAL_FUNC (_selection_clear_event),
                    text);
        gtk_signal_connect (GTK_OBJECT(invisible), "selection_received",
                    GTK_SIGNAL_FUNC (_selection_received),
                    text);
        
        gtk_signal_connect (GTK_OBJECT(invisible), "destroy",
                    GTK_SIGNAL_FUNC (_invisible_destroy),
                    text);
    }
    return invisible;
}

static void
_selection_clear_event (GtkInvisible *invisible,
            GdkEventSelection *event,
            EText *text)
{
    if (event->selection == GDK_SELECTION_PRIMARY) {
        g_free (text->primary_selection);
        text->primary_selection = NULL;
        text->primary_length = 0;

        text->has_selection = FALSE;
        gnome_canvas_item_request_update (GNOME_CANVAS_ITEM(text));

    } else if (event->selection == clipboard_atom) {
        g_free (text->clipboard_selection);
        text->clipboard_selection = NULL;
        text->clipboard_length = 0;
    }
}

static void
_selection_get (GtkInvisible *invisible,
        GtkSelectionData *selection_data,
        guint info,
        guint time_stamp,
        EText *text)
{
    switch (info) {
    case E_SELECTION_PRIMARY:
        gtk_selection_data_set (selection_data, GDK_SELECTION_TYPE_STRING,
                    8, text->primary_selection, text->primary_length);
        break;
    case E_SELECTION_CLIPBOARD:
        gtk_selection_data_set (selection_data, GDK_SELECTION_TYPE_STRING,
                    8, text->clipboard_selection, text->clipboard_length);
        break;
    }
}

static void
_selection_received (GtkInvisible *invisible,
             GtkSelectionData *selection_data,
             guint time,
             EText *text)
{
    if (selection_data->length < 0 || selection_data->type != GDK_SELECTION_TYPE_STRING) {
        return;
    } else {
        ETextEventProcessorCommand command;
        command.action = E_TEP_INSERT;
        command.position = E_TEP_SELECTION;
        command.string = selection_data->data;
        command.value = selection_data->length;
        command.time = time;
        e_text_command(text->tep, &command, text);
    }
}

static void e_text_supply_selection (EText *text, guint time, GdkAtom selection, guchar *data, gint length)
{
    gboolean successful;
    GtkWidget *invisible;

    invisible = e_text_get_invisible(text);

    if (selection == GDK_SELECTION_PRIMARY ) {
        if (text->primary_selection) {
            g_free (text->primary_selection);
        }
        text->primary_selection = g_strndup(data, length);
        text->primary_length = length;
    } else if (selection == clipboard_atom) {
        if (text->clipboard_selection) {
            g_free (text->clipboard_selection);
        }
        text->clipboard_selection = g_strndup(data, length);
        text->clipboard_length = length;
    }

    successful = gtk_selection_owner_set (invisible,
                          selection,
                          time);
    
    if (selection == GDK_SELECTION_PRIMARY)
        text->has_selection = successful;
}

static void
e_text_get_selection(EText *text, GdkAtom selection, guint32 time)
{
    GtkWidget *invisible;
    invisible = e_text_get_invisible(text);
    gtk_selection_convert(invisible,
                  selection,
                  GDK_SELECTION_TYPE_STRING,
                  time);
}

#if 0
static void
e_text_real_copy_clipboard (EText *text)
{
  guint32 time;
  gint selection_start_pos; 
  gint selection_end_pos;

  g_return_if_fail (text != NULL);
  g_return_if_fail (E_IS_TEXT (text));
  
  time = gtk_text_get_event_time (text);
  selection_start_pos = MIN (text->selection_start, text->selection_end);
  selection_end_pos = MAX (text->selection_start, text->selection_end);
 
  if (selection_start_pos != selection_end_pos)
    {
      if (gtk_selection_owner_set (GTK_WIDGET (text->canvas),
                   clipboard_atom,
                   time))
          text->clipboard_text = "";
    }
}

static void
e_text_real_paste_clipboard (EText *text)
{
  guint32 time;

  g_return_if_fail (text != NULL);
  g_return_if_fail (E_IS_TEXT (text));
  
  time = e_text_get_event_time (text);
  if (text->editable)
      gtk_selection_convert (GTK_WIDGET(text->widget),
                 clipboard_atom,
                 gdk_atom_intern ("COMPOUND_TEXT", FALSE), time);
}
#endif

/* Get the timestamp of the current event. Actually, the only thing
 * we really care about below is the key event
 */
static guint32
e_text_get_event_time (EText *text)
{
  GdkEvent *event;
  guint32 tm = GDK_CURRENT_TIME;
  
  event = gtk_get_current_event();
  
  if (event)
    switch (event->type)
      {
      case GDK_MOTION_NOTIFY:
    tm = event->motion.time; break;
      case GDK_BUTTON_PRESS:
      case GDK_2BUTTON_PRESS:
      case GDK_3BUTTON_PRESS:
      case GDK_BUTTON_RELEASE:
    tm = event->button.time; break;
      case GDK_KEY_PRESS:
      case GDK_KEY_RELEASE:
    tm = event->key.time; break;
      case GDK_ENTER_NOTIFY:
      case GDK_LEAVE_NOTIFY:
    tm = event->crossing.time; break;
      case GDK_PROPERTY_NOTIFY:
    tm = event->property.time; break;
      case GDK_SELECTION_CLEAR:
      case GDK_SELECTION_REQUEST:
      case GDK_SELECTION_NOTIFY:
    tm = event->selection.time; break;
      case GDK_PROXIMITY_IN:
      case GDK_PROXIMITY_OUT:
    tm = event->proximity.time; break;
      default:          /* use current time */
    break;
      }
  gdk_event_free(event);
  
  return tm;
}



/* Routines for sucking fonts from the X server */

static ETextSuckFont *
e_suck_font (GdkFont *font)
{
    ETextSuckFont *suckfont;
    int i;
    int x, y;
    char text[1];
    int lbearing, rbearing, ch_width, ascent, descent;
    GdkPixmap *pixmap;
    GdkColor black, white;
    GdkImage *image;
    GdkGC *gc;
    guchar *line;
    int width, height;
    int black_pixel, pixel;

    if (!font)
        return NULL;

    suckfont = g_new (ETextSuckFont, 1);

    height = font->ascent + font->descent;
    x = 0;
    for (i = 0; i < 256; i++) {
        text[0] = i;
        gdk_text_extents (font, text, 1,
                  &lbearing, &rbearing, &ch_width, &ascent, &descent);
        suckfont->chars[i].left_sb = lbearing;
        suckfont->chars[i].right_sb = ch_width - rbearing;
        suckfont->chars[i].width = rbearing - lbearing;
        suckfont->chars[i].ascent = ascent;
        suckfont->chars[i].descent = descent;
        suckfont->chars[i].bitmap_offset = x;
        x += (ch_width + 31) & -32;
    }

    width = x;

    suckfont->bitmap_width = width;
    suckfont->bitmap_height = height;
    suckfont->ascent = font->ascent;

    pixmap = gdk_pixmap_new (NULL, suckfont->bitmap_width,
                 suckfont->bitmap_height, 1);
    gc = gdk_gc_new (pixmap);
    gdk_gc_set_font (gc, font);

    black_pixel = BlackPixel (gdk_display, DefaultScreen (gdk_display));
    black.pixel = black_pixel;
    white.pixel = WhitePixel (gdk_display, DefaultScreen (gdk_display));
    gdk_gc_set_foreground (gc, &white);
    gdk_draw_rectangle (pixmap, gc, 1, 0, 0, width, height);

    gdk_gc_set_foreground (gc, &black);
    for (i = 0; i < 256; i++) {
        text[0] = i;
        gdk_draw_text (pixmap, font, gc,
                   suckfont->chars[i].bitmap_offset - suckfont->chars[i].left_sb,
                   font->ascent,
                   text, 1);
    }

    /* The handling of the image leaves me with distinct unease.  But this
     * is more or less copied out of gimp/app/text_tool.c, so it _ought_ to
     * work. -RLL
     */

    image = gdk_image_get (pixmap, 0, 0, width, height);
    suckfont->bitmap = g_malloc0 ((width >> 3) * height);

    line = suckfont->bitmap;
    for (y = 0; y < height; y++) {
        for (x = 0; x < width; x++) {
            pixel = gdk_image_get_pixel (image, x, y);
            if (pixel == black_pixel)
                line[x >> 3] |= 128 >> (x & 7);
        }
        line += width >> 3;
    }

    gdk_image_destroy (image);

    /* free the pixmap */
    gdk_pixmap_unref (pixmap);

    /* free the gc */
    gdk_gc_destroy (gc);

    return suckfont;
}

static void
e_suck_font_free (ETextSuckFont *suckfont)
{
    g_free (suckfont->bitmap);
    g_free (suckfont);
}