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path: root/libgnomecanvas/gnome-canvas-rich-text.c
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/* Editable GnomeCanvas text item based on GtkTextLayout, borrowed heavily
 * from GtkTextView.
 *
 * Copyright (c) 2000 Red Hat, Inc.
 * Copyright (c) 2001 Joe Shaw
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <math.h>
#include <stdio.h>
#include <string.h>

#include <gdk/gdkkeysyms.h>
#include <gtk/gtk.h>
#define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
#include <gtk/gtktextdisplay.h>

#include "gnome-canvas.h"
#include "gnome-canvas-util.h"
#include "gnome-canvas-rich-text.h"
#include "gnome-canvas-i18n.h"

struct _GnomeCanvasRichTextPrivate {
    GtkTextLayout *layout;
    GtkTextBuffer *buffer;

    char *text;

    /* Position at anchor */
    double x, y;
    /* Dimensions */
    double width, height;
    /* Top-left canvas coordinates for text */
    int cx, cy;

    gboolean cursor_visible;
    gboolean cursor_blink;
    gboolean editable;
    gboolean visible;
    gboolean grow_height;
    GtkWrapMode wrap_mode;
    GtkJustification justification;
    GtkTextDirection direction;
    GtkAnchorType anchor;
    int pixels_above_lines;
    int pixels_below_lines;
    int pixels_inside_wrap;
    int left_margin;
    int right_margin;
    int indent;

    guint preblink_timeout;
    guint blink_timeout;

    guint selection_drag_handler;

    gint drag_start_x;
    gint drag_start_y;

    gboolean just_selected_element;

    int clicks;
    guint click_timeout;
};

enum {
    PROP_0,
    PROP_TEXT,
    PROP_X,
    PROP_Y,
    PROP_WIDTH,
    PROP_HEIGHT,
    PROP_EDITABLE,
    PROP_VISIBLE,
    PROP_CURSOR_VISIBLE,
    PROP_CURSOR_BLINK,
    PROP_GROW_HEIGHT,
    PROP_WRAP_MODE,
    PROP_JUSTIFICATION,
    PROP_DIRECTION,
    PROP_ANCHOR,
    PROP_PIXELS_ABOVE_LINES,
    PROP_PIXELS_BELOW_LINES,
    PROP_PIXELS_INSIDE_WRAP,
    PROP_LEFT_MARGIN,
    PROP_RIGHT_MARGIN,
    PROP_INDENT
};

enum {
    TAG_CHANGED,
    LAST_SIGNAL
};

static GnomeCanvasItemClass *parent_class;
static guint signals[LAST_SIGNAL] = { 0 };

static void gnome_canvas_rich_text_class_init(GnomeCanvasRichTextClass *klass);
static void gnome_canvas_rich_text_init(GnomeCanvasRichText *text);
static void gnome_canvas_rich_text_set_property(GObject *object, guint property_id,
                        const GValue *value, GParamSpec *pspec);
static void gnome_canvas_rich_text_get_property(GObject *object, guint property_id,
                        GValue *value, GParamSpec *pspec);
static void gnome_canvas_rich_text_update(GnomeCanvasItem *item, double *affine,
                      ArtSVP *clip_path, int flags);
static void gnome_canvas_rich_text_realize(GnomeCanvasItem *item);
static void gnome_canvas_rich_text_unrealize(GnomeCanvasItem *item);
static double gnome_canvas_rich_text_point(GnomeCanvasItem *item, 
                       double x, double y,
                       int cx, int cy, 
                       GnomeCanvasItem **actual_item);
static void gnome_canvas_rich_text_draw(GnomeCanvasItem *item, 
                    GdkDrawable *drawable,
                    int x, int y, int width, int height);
static void gnome_canvas_rich_text_render(GnomeCanvasItem *item,
                      GnomeCanvasBuf *buf);
static gint gnome_canvas_rich_text_event(GnomeCanvasItem *item, 
                     GdkEvent *event);
static void gnome_canvas_rich_text_get_bounds(GnomeCanvasItem *text, double *px1, double *py1,
       double *px2, double *py2);

static void gnome_canvas_rich_text_ensure_layout(GnomeCanvasRichText *text);
static void gnome_canvas_rich_text_destroy_layout(GnomeCanvasRichText *text);
static void gnome_canvas_rich_text_start_cursor_blink(GnomeCanvasRichText *text, gboolean delay);
static void gnome_canvas_rich_text_stop_cursor_blink(GnomeCanvasRichText *text);
static void gnome_canvas_rich_text_move_cursor(GnomeCanvasRichText *text,
                           GtkMovementStep step,
                           gint count,
                           gboolean extend_selection);



static GtkTextBuffer *get_buffer(GnomeCanvasRichText *text);
static gint blink_cb(gpointer data);

#define PREBLINK_TIME 300
#define CURSOR_ON_TIME 800
#define CURSOR_OFF_TIME 400

GType
gnome_canvas_rich_text_get_type(void)
{
    static GType rich_text_type;

    if (!rich_text_type) {
        const GTypeInfo object_info = {
            sizeof (GnomeCanvasRichTextClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) gnome_canvas_rich_text_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,           /* class_data */
            sizeof (GnomeCanvasRichText),
            0,          /* n_preallocs */
            (GInstanceInitFunc) gnome_canvas_rich_text_init,
            NULL            /* value_table */
        };

        rich_text_type = g_type_register_static (GNOME_TYPE_CANVAS_ITEM, "GnomeCanvasRichText",
                             &object_info, 0);
    }

    return rich_text_type;
}

static void
gnome_canvas_rich_text_finalize(GObject *object)
{
    GnomeCanvasRichText *text;

    text = GNOME_CANVAS_RICH_TEXT(object);

    g_free (text->_priv);
    text->_priv = NULL;

    if (G_OBJECT_CLASS (parent_class)->finalize)
        G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
gnome_canvas_rich_text_class_init(GnomeCanvasRichTextClass *klass)
{
    GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
    GtkObjectClass *object_class = GTK_OBJECT_CLASS(klass);
    GnomeCanvasItemClass *item_class = GNOME_CANVAS_ITEM_CLASS(klass);
    
    parent_class = g_type_class_peek_parent (klass);

    gobject_class->set_property = gnome_canvas_rich_text_set_property;
    gobject_class->get_property = gnome_canvas_rich_text_get_property;

    g_object_class_install_property (
        gobject_class,
        PROP_TEXT,
        g_param_spec_string ("text",
                     _("Text"),
                     _("Text to display"),
                     NULL,
                     G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_X,
        g_param_spec_double ("x",
                     _("X"),
                     _("X position"),
                     -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
                     G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_Y,
        g_param_spec_double ("y",
                     _("Y"),
                     _("Y position"),
                     -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
                     G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_WIDTH,
        g_param_spec_double ("width",
                     _("Width"),
                     _("Width for text box"),
                     -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
                     G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_HEIGHT,
        g_param_spec_double ("height",
                     _("Height"),
                     _("Height for text box"),
                     -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
                     G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_EDITABLE,
        g_param_spec_boolean ("editable",
                      _("Editable"),
                      _("Is this rich text item editable?"),
                      TRUE,
                      G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_VISIBLE,
        g_param_spec_boolean ("visible",
                      _("Visible"),
                      _("Is this rich text item visible?"),
                      TRUE,
                      G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_CURSOR_VISIBLE,
        g_param_spec_boolean ("cursor_visible",
                      _("Cursor Visible"),
                      _("Is the cursor visible in this rich text item?"),
                      TRUE,
                      G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_CURSOR_BLINK,
        g_param_spec_boolean ("cursor_blink",
                      _("Cursor Blink"),
                      _("Does the cursor blink in this rich text item?"),
                      TRUE,
                      G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_GROW_HEIGHT,
        g_param_spec_boolean ("grow_height",
                      _("Grow Height"),
                      _("Should the text box height grow if the text does not fit?"),
                      FALSE,
                      G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_WRAP_MODE,
        g_param_spec_enum ("wrap_mode",
                   _("Wrap Mode"),
                   _("Wrap mode for multiline text"),
                   GTK_TYPE_WRAP_MODE,
                   GTK_WRAP_WORD,
                   G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_JUSTIFICATION,
        g_param_spec_enum ("justification",
                   _("Justification"),
                   _("Justification mode"),
                   GTK_TYPE_JUSTIFICATION,
                   GTK_JUSTIFY_LEFT,
                   G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_DIRECTION,
        g_param_spec_enum ("direction",
                   _("Direction"),
                   _("Text direction"),
                   GTK_TYPE_DIRECTION_TYPE,
                   gtk_widget_get_default_direction (),
                   G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_ANCHOR,
        g_param_spec_enum ("anchor",
                   _("Anchor"),
                   _("Anchor point for text"),
                   GTK_TYPE_ANCHOR_TYPE,
                   GTK_ANCHOR_NW,
                   G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_PIXELS_ABOVE_LINES,
        g_param_spec_int ("pixels_above_lines",
                  _("Pixels Above Lines"),
                  _("Number of pixels to put above lines"),
                  G_MININT, G_MAXINT,
                  0,
                  G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_PIXELS_BELOW_LINES,
        g_param_spec_int ("pixels_below_lines",
                  _("Pixels Below Lines"),
                  _("Number of pixels to put below lines"),
                  G_MININT, G_MAXINT,
                  0,
                  G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_PIXELS_INSIDE_WRAP,
        g_param_spec_int ("pixels_inside_wrap",
                  _("Pixels Inside Wrap"),
                  _("Number of pixels to put inside the wrap"),
                  G_MININT, G_MAXINT,
                  0,
                  G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_LEFT_MARGIN,
        g_param_spec_int ("left_margin",
                  _("Left Margin"),
                  _("Number of pixels in the left margin"),
                  G_MININT, G_MAXINT,
                  0,
                  G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_RIGHT_MARGIN,
        g_param_spec_int ("right_margin",
                  _("Right Margin"),
                  _("Number of pixels in the right margin"),
                  G_MININT, G_MAXINT,
                  0,
                  G_PARAM_READWRITE));
    g_object_class_install_property (
        gobject_class,
        PROP_INDENT,
        g_param_spec_int ("indent",
                  _("Indentation"),
                  _("Number of pixels for indentation"),
                  G_MININT, G_MAXINT,
                  0,
                  G_PARAM_READWRITE));

    /* Signals */
    signals[TAG_CHANGED] = g_signal_new(
        "tag_changed",
        G_TYPE_FROM_CLASS(object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET(GnomeCanvasRichTextClass, tag_changed),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        G_TYPE_OBJECT);

    gobject_class->finalize = gnome_canvas_rich_text_finalize;

    item_class->update = gnome_canvas_rich_text_update;
    item_class->realize = gnome_canvas_rich_text_realize;
    item_class->unrealize = gnome_canvas_rich_text_unrealize;
    item_class->draw = gnome_canvas_rich_text_draw;
    item_class->point = gnome_canvas_rich_text_point;
    item_class->render = gnome_canvas_rich_text_render;
    item_class->event = gnome_canvas_rich_text_event;
    item_class->bounds = gnome_canvas_rich_text_get_bounds;
} /* gnome_canvas_rich_text_class_init */

static void
gnome_canvas_rich_text_init(GnomeCanvasRichText *text)
{
#if 0
    GtkObject *object = GTK_OBJECT(text);

    object->flags |= GNOME_CANVAS_ITEM_ALWAYS_REDRAW;
#endif
    text->_priv = g_new0(GnomeCanvasRichTextPrivate, 1);

    /* Try to set some sane defaults */
    text->_priv->cursor_visible = TRUE;
    text->_priv->cursor_blink = TRUE;
    text->_priv->editable = TRUE;
    text->_priv->visible = TRUE;
    text->_priv->grow_height = FALSE;
    text->_priv->wrap_mode = GTK_WRAP_WORD;
    text->_priv->justification = GTK_JUSTIFY_LEFT;
    text->_priv->direction = gtk_widget_get_default_direction();
    text->_priv->anchor = GTK_ANCHOR_NW;
    
    text->_priv->blink_timeout = 0;
    text->_priv->preblink_timeout = 0;

    text->_priv->clicks = 0;
    text->_priv->click_timeout = 0;
} /* gnome_canvas_rich_text_init */

static void
gnome_canvas_rich_text_set_property (GObject *object, guint property_id,
                     const GValue *value, GParamSpec *pspec)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(object);

    switch (property_id) {
    case PROP_TEXT:
        if (text->_priv->text)
            g_free(text->_priv->text);

        text->_priv->text = g_value_dup_string (value);

        gtk_text_buffer_set_text(
            get_buffer(text), text->_priv->text, strlen(text->_priv->text));

        break;
    case PROP_X:
        text->_priv->x = g_value_get_double (value);
        break;
    case PROP_Y:
        text->_priv->y = g_value_get_double (value);
        break;
    case PROP_WIDTH:
        text->_priv->width = g_value_get_double (value);
        break;
    case PROP_HEIGHT:
        text->_priv->height = g_value_get_double (value);
        break;
    case PROP_EDITABLE:
        text->_priv->editable = g_value_get_boolean (value);
        if (text->_priv->layout) {
            text->_priv->layout->default_style->editable =
                text->_priv->editable;
            gtk_text_layout_default_style_changed(text->_priv->layout);
        }
        break;
    case PROP_VISIBLE:
        text->_priv->visible = g_value_get_boolean (value);
        if (text->_priv->layout) {
            text->_priv->layout->default_style->invisible =
                !text->_priv->visible;
            gtk_text_layout_default_style_changed(text->_priv->layout);
        }
        break;
    case PROP_CURSOR_VISIBLE:
        text->_priv->cursor_visible = g_value_get_boolean (value);
        if (text->_priv->layout) {
            gtk_text_layout_set_cursor_visible(
                text->_priv->layout, text->_priv->cursor_visible);

            if (text->_priv->cursor_visible && text->_priv->cursor_blink) {
                gnome_canvas_rich_text_start_cursor_blink(
                    text, FALSE);
            }
            else
                gnome_canvas_rich_text_stop_cursor_blink(text);
        }
        break;
    case PROP_CURSOR_BLINK:
        text->_priv->cursor_blink = g_value_get_boolean (value);
        if (text->_priv->layout && text->_priv->cursor_visible) {
            if (text->_priv->cursor_blink && !text->_priv->blink_timeout) {
                gnome_canvas_rich_text_start_cursor_blink(
                    text, FALSE);
            }
            else if (!text->_priv->cursor_blink && text->_priv->blink_timeout) {
                gnome_canvas_rich_text_stop_cursor_blink(text);
                gtk_text_layout_set_cursor_visible(
                    text->_priv->layout, TRUE);
            }
        }
        break;
    case PROP_GROW_HEIGHT:
        text->_priv->grow_height = g_value_get_boolean (value);
        /* FIXME: Recalc here */
        break;
    case PROP_WRAP_MODE:
        text->_priv->wrap_mode = g_value_get_enum (value);

        if (text->_priv->layout) {
            text->_priv->layout->default_style->wrap_mode = 
                text->_priv->wrap_mode;
            gtk_text_layout_default_style_changed(text->_priv->layout);
        }
        break;
    case PROP_JUSTIFICATION:
        text->_priv->justification = g_value_get_enum (value);

        if (text->_priv->layout) {
            text->_priv->layout->default_style->justification =
                text->_priv->justification;
            gtk_text_layout_default_style_changed(text->_priv->layout);
        }
        break;
    case PROP_DIRECTION:
        text->_priv->direction = g_value_get_enum (value);

        if (text->_priv->layout) {
            text->_priv->layout->default_style->direction =
                text->_priv->direction;
            gtk_text_layout_default_style_changed(text->_priv->layout);
        }
        break;
    case PROP_ANCHOR:
        text->_priv->anchor = g_value_get_enum (value);
        break;
    case PROP_PIXELS_ABOVE_LINES:
        text->_priv->pixels_above_lines = g_value_get_int (value);
        
        if (text->_priv->layout) {
            text->_priv->layout->default_style->pixels_above_lines =
                text->_priv->pixels_above_lines;
            gtk_text_layout_default_style_changed(text->_priv->layout);
        }
        break;
    case PROP_PIXELS_BELOW_LINES:
        text->_priv->pixels_below_lines = g_value_get_int (value);
        
        if (text->_priv->layout) {
            text->_priv->layout->default_style->pixels_below_lines =
                text->_priv->pixels_below_lines;
            gtk_text_layout_default_style_changed(text->_priv->layout);
        }
        break;
    case PROP_PIXELS_INSIDE_WRAP:
        text->_priv->pixels_inside_wrap = g_value_get_int (value);
        
        if (text->_priv->layout) {
            text->_priv->layout->default_style->pixels_inside_wrap =
                text->_priv->pixels_inside_wrap;
            gtk_text_layout_default_style_changed(text->_priv->layout);
        }
        break;
    case PROP_LEFT_MARGIN:
        text->_priv->left_margin = g_value_get_int (value);
        
        if (text->_priv->layout) {
            text->_priv->layout->default_style->left_margin =
                text->_priv->left_margin;
            gtk_text_layout_default_style_changed(text->_priv->layout);
        }
        break;
    case PROP_RIGHT_MARGIN:
        text->_priv->right_margin = g_value_get_int (value);
        
        if (text->_priv->layout) {
            text->_priv->layout->default_style->right_margin =
                text->_priv->right_margin;
            gtk_text_layout_default_style_changed(text->_priv->layout);
        }
        break;
    case PROP_INDENT:
        text->_priv->pixels_above_lines = g_value_get_int (value);
        
        if (text->_priv->layout) {
            text->_priv->layout->default_style->indent = text->_priv->indent;
            gtk_text_layout_default_style_changed(text->_priv->layout);
        }
        break;
               
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
        break;
    }

    gnome_canvas_item_request_update(GNOME_CANVAS_ITEM(text));
}

static void
gnome_canvas_rich_text_get_property (GObject *object, guint property_id,
                     GValue *value, GParamSpec *pspec)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(object);

    switch (property_id) {
    case PROP_TEXT:
        g_value_set_string (value, text->_priv->text);
        break;
    case PROP_X:
        g_value_set_double (value, text->_priv->x);
        break;
    case PROP_Y:
        g_value_set_double (value, text->_priv->y);
        break;
    case PROP_HEIGHT:
        g_value_set_double (value, text->_priv->height);
        break;
    case PROP_WIDTH:
        g_value_set_double (value, text->_priv->width);
        break;
    case PROP_EDITABLE:
        g_value_set_boolean (value, text->_priv->editable);
        break;
    case PROP_CURSOR_VISIBLE:
        g_value_set_boolean (value, text->_priv->cursor_visible);
        break;
    case PROP_CURSOR_BLINK:
        g_value_set_boolean (value, text->_priv->cursor_blink);
        break;
    case PROP_GROW_HEIGHT:
        g_value_set_boolean (value, text->_priv->grow_height);
        break;
    case PROP_WRAP_MODE:
        g_value_set_enum (value, text->_priv->wrap_mode);
        break;
    case PROP_JUSTIFICATION:
        g_value_set_enum (value, text->_priv->justification);
        break;
    case PROP_DIRECTION:
        g_value_set_enum (value, text->_priv->direction);
        break;
    case PROP_ANCHOR:
        g_value_set_enum (value, text->_priv->anchor);
        break;
    case PROP_PIXELS_ABOVE_LINES:
        g_value_set_enum (value, text->_priv->pixels_above_lines);
        break;
    case PROP_PIXELS_BELOW_LINES:
        g_value_set_int (value, text->_priv->pixels_below_lines);
        break;
    case PROP_PIXELS_INSIDE_WRAP:
        g_value_set_int (value, text->_priv->pixels_inside_wrap);
        break;
    case PROP_LEFT_MARGIN:
        g_value_set_int (value, text->_priv->left_margin);
        break;
    case PROP_RIGHT_MARGIN:
        g_value_set_int (value, text->_priv->right_margin);
        break;
    case PROP_INDENT:
        g_value_set_int (value, text->_priv->indent);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
        break;
    }
}

static void
gnome_canvas_rich_text_realize(GnomeCanvasItem *item)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(item);

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

    gnome_canvas_rich_text_ensure_layout(text);
} /* gnome_canvas_rich_text_realize */

static void
gnome_canvas_rich_text_unrealize(GnomeCanvasItem *item)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(item);

    gnome_canvas_rich_text_destroy_layout(text);

    (* GNOME_CANVAS_ITEM_CLASS(parent_class)->unrealize)(item);
} /* gnome_canvas_rich_text_unrealize */

static void
gnome_canvas_rich_text_move_iter_by_lines(GnomeCanvasRichText *text,
                      GtkTextIter *newplace, gint count)
{
    while (count < 0) {
        gtk_text_layout_move_iter_to_previous_line(
            text->_priv->layout, newplace);
        count++;
    }

    while (count > 0) {
        gtk_text_layout_move_iter_to_next_line(
            text->_priv->layout, newplace);
        count--;
    }
} /* gnome_canvas_rich_text_move_iter_by_lines */

static gint
gnome_canvas_rich_text_get_cursor_x_position(GnomeCanvasRichText *text)
{
    GtkTextIter insert;
    GdkRectangle rect;

    gtk_text_buffer_get_iter_at_mark(
        get_buffer(text), &insert,
        gtk_text_buffer_get_mark(get_buffer(text), "insert"));
    gtk_text_layout_get_cursor_locations(
        text->_priv->layout, &insert, &rect, NULL);

    return rect.x;
} /* gnome_canvas_rich_text_get_cursor_x_position */

static void
gnome_canvas_rich_text_move_cursor(GnomeCanvasRichText *text,
                   GtkMovementStep step,
                   gint count, gboolean extend_selection)
{
    GtkTextIter insert, newplace;

    gtk_text_buffer_get_iter_at_mark(
        get_buffer(text), &insert, 
        gtk_text_buffer_get_mark(get_buffer(text), "insert"));

    newplace = insert;

    switch (step) {
    case GTK_MOVEMENT_LOGICAL_POSITIONS:
        gtk_text_iter_forward_cursor_positions(&newplace, count);
        break;
    case GTK_MOVEMENT_VISUAL_POSITIONS:
        gtk_text_layout_move_iter_visually(
            text->_priv->layout, &newplace, count);
        break;
    case GTK_MOVEMENT_WORDS:
        if (count < 0)
            gtk_text_iter_backward_word_starts(&newplace, -count);
        else if (count > 0)
            gtk_text_iter_forward_word_ends(&newplace, count);
        break;
    case GTK_MOVEMENT_DISPLAY_LINES:
        gnome_canvas_rich_text_move_iter_by_lines(
            text, &newplace, count);
        gtk_text_layout_move_iter_to_x(
            text->_priv->layout, &newplace, 
            gnome_canvas_rich_text_get_cursor_x_position(text));
        break;
    case GTK_MOVEMENT_DISPLAY_LINE_ENDS:
        if (count > 1) {
            gnome_canvas_rich_text_move_iter_by_lines(
                text, &newplace, --count);
        }
        else if (count < -1) {
            gnome_canvas_rich_text_move_iter_by_lines(
                text, &newplace, ++count);
        }
           
        if (count != 0) {
            gtk_text_layout_move_iter_to_line_end(
                text->_priv->layout, &newplace, count);
        }
        break;
    case GTK_MOVEMENT_PARAGRAPHS:
        /* FIXME: Busted in gtktextview.c too */
        break;
    case GTK_MOVEMENT_PARAGRAPH_ENDS:
        if (count > 0)
            gtk_text_iter_forward_to_line_end(&newplace);
        else if (count < 0)
            gtk_text_iter_set_line_offset(&newplace, 0);
        break;
    case GTK_MOVEMENT_BUFFER_ENDS:
        if (count > 0) {
            gtk_text_buffer_get_end_iter(
                get_buffer(text), &newplace);
        }
        else if (count < 0) {
            gtk_text_buffer_get_iter_at_offset(
                get_buffer(text), &newplace, 0);
        }
        break;
    default:
        break;
    }

    if (!gtk_text_iter_equal(&insert, &newplace)) {
        if (extend_selection) {
            gtk_text_buffer_move_mark(
                get_buffer(text),
                gtk_text_buffer_get_mark(
                    get_buffer(text), "insert"),
                &newplace);
        }
        else {
            gtk_text_buffer_place_cursor(
                get_buffer(text), &newplace);
        }
    }

    gnome_canvas_rich_text_start_cursor_blink(text, TRUE);
} /* gnome_canvas_rich_text_move_cursor */

static gboolean
whitespace(gunichar ch, gpointer user_data)
{
    return (ch == ' ' || ch == '\t');
} /* whitespace */

static gboolean
not_whitespace(gunichar ch, gpointer user_data)
{
    return !whitespace(ch, user_data);
} /* not_whitespace */

static gboolean
find_whitespace_region(const GtkTextIter *center,
               GtkTextIter *start, GtkTextIter *end)
{
    *start = *center;
    *end = *center;

    if (gtk_text_iter_backward_find_char(start, not_whitespace, NULL, NULL))
        gtk_text_iter_forward_char(start);
    if (whitespace(gtk_text_iter_get_char(end), NULL))
        gtk_text_iter_forward_find_char(end, not_whitespace, NULL, NULL);

    return !gtk_text_iter_equal(start, end);
} /* find_whitespace_region */

static void
gnome_canvas_rich_text_delete_from_cursor(GnomeCanvasRichText *text,
                      GtkDeleteType type,
                      gint count)
{
    GtkTextIter insert, start, end;

    /* Special case: If the user wants to delete a character and there is
       a selection, then delete the selection and return */
    if (type == GTK_DELETE_CHARS) {
        if (gtk_text_buffer_delete_selection(get_buffer(text), TRUE, 
                             text->_priv->editable))
            return;
    }

    gtk_text_buffer_get_iter_at_mark(
        get_buffer(text), &insert,
        gtk_text_buffer_get_mark(get_buffer(text), "insert"));

    start = insert;
    end = insert;

    switch (type) {
    case GTK_DELETE_CHARS:
        gtk_text_iter_forward_cursor_positions(&end, count);
        break;
    case GTK_DELETE_WORD_ENDS:
        if (count > 0)
            gtk_text_iter_forward_word_ends(&end, count);
        else if (count < 0)
            gtk_text_iter_backward_word_starts(&start, -count);
        break;
    case GTK_DELETE_WORDS:
        break;
    case GTK_DELETE_DISPLAY_LINE_ENDS:
        break;
    case GTK_DELETE_PARAGRAPH_ENDS:
        if (gtk_text_iter_ends_line(&end)) {
            gtk_text_iter_forward_line(&end);
            --count;
        }

        while (count > 0) {
            if (!gtk_text_iter_forward_to_line_end(&end))
                break;

            --count;
        }
        break;
    case GTK_DELETE_PARAGRAPHS:
        if (count > 0) {
            gtk_text_iter_set_line_offset(&start, 0);
            gtk_text_iter_forward_to_line_end(&end);

            /* Do the lines beyond the first. */
            while (count > 1) {
                gtk_text_iter_forward_to_line_end(&end);
                --count;
            }
        }
        break;
    case GTK_DELETE_WHITESPACE:
        find_whitespace_region(&insert, &start, &end);
        break;

    default:
        break;
    }

    if (!gtk_text_iter_equal(&start, &end)) {
        gtk_text_buffer_begin_user_action(get_buffer(text));
        gtk_text_buffer_delete_interactive(
            get_buffer(text), &start, &end, text->_priv->editable);
        gtk_text_buffer_end_user_action(get_buffer(text));
    }
} /* gnome_canvas_rich_text_delete_from_cursor */

static gint
selection_motion_event_handler(GnomeCanvasRichText *text, GdkEvent *event,
                   gpointer data)
{
    GtkTextIter newplace;
    GtkTextMark *mark;
    double newx, newy;

    /* We only want to handle motion events... */
    if (event->type != GDK_MOTION_NOTIFY)
        return FALSE;

    newx = (event->motion.x - text->_priv->x) * 
        GNOME_CANVAS_ITEM(text)->canvas->pixels_per_unit;
    newy = (event->motion.y - text->_priv->y) * 
        GNOME_CANVAS_ITEM(text)->canvas->pixels_per_unit;

    gtk_text_layout_get_iter_at_pixel(text->_priv->layout, &newplace, newx, newy);
    mark = gtk_text_buffer_get_mark(get_buffer(text), "insert");
    gtk_text_buffer_move_mark(get_buffer(text), mark, &newplace);

    return TRUE;
} /* selection_motion_event_handler */

static void
gnome_canvas_rich_text_start_selection_drag(GnomeCanvasRichText *text,
                        const GtkTextIter *iter,
                        GdkEventButton *button)
{
    GtkTextIter newplace;

    g_return_if_fail(text->_priv->selection_drag_handler == 0);

#if 0
    gnome_canvas_item_grab_focus(GNOME_CANVAS_ITEM(text));
#endif

    newplace = *iter;

    gtk_text_buffer_place_cursor(get_buffer(text), &newplace);

    text->_priv->selection_drag_handler = g_signal_connect(
        text, "event",
        G_CALLBACK (selection_motion_event_handler),
        NULL);
} /* gnome_canvas_rich_text_start_selection_drag */

static gboolean
gnome_canvas_rich_text_end_selection_drag(GnomeCanvasRichText *text,
                      GdkEventButton *event)
{
    if (text->_priv->selection_drag_handler == 0)
        return FALSE;

    g_signal_handler_disconnect (text, text->_priv->selection_drag_handler);
    text->_priv->selection_drag_handler = 0;

#if 0
    gnome_canvas_item_grab(NULL);
#endif

    return TRUE;
} /* gnome_canvas_rich_text_end_selection_drag */

static void
gnome_canvas_rich_text_emit_tag_changed(GnomeCanvasRichText *text,
                    GtkTextTag *tag)
{
    g_signal_emit(G_OBJECT(text), signals[TAG_CHANGED], 0, tag);
} /* gnome_canvas_rich_text_emit_tag_changed */
                        
static gint
gnome_canvas_rich_text_key_press_event(GnomeCanvasItem *item, 
                       GdkEventKey *event)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(item);
    gboolean extend_selection = FALSE;
    gboolean handled = FALSE;

#if 0
    printf("Key press event\n");
#endif

    if (!text->_priv->layout || !text->_priv->buffer)
        return FALSE;

    if (event->state & GDK_SHIFT_MASK)
        extend_selection = TRUE;

    switch (event->keyval) {
    case GDK_Return:
    case GDK_KP_Enter:
        gtk_text_buffer_delete_selection(
            get_buffer(text), TRUE, text->_priv->editable);
        gtk_text_buffer_insert_interactive_at_cursor(
            get_buffer(text), "\n", 1, text->_priv->editable);
        handled = TRUE;
        break;

    case GDK_Tab:
        gtk_text_buffer_insert_interactive_at_cursor(
            get_buffer(text), "\t", 1, text->_priv->editable);
        handled = TRUE;
        break;

    /* MOVEMENT */
    case GDK_Right:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_move_cursor(
                text, GTK_MOVEMENT_WORDS, 1, 
                extend_selection);
            handled = TRUE;
        }
        else {
            gnome_canvas_rich_text_move_cursor(
                text, GTK_MOVEMENT_VISUAL_POSITIONS, 1,
                extend_selection);
            handled = TRUE;
        }
        break;
    case GDK_Left:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_move_cursor(
                text, GTK_MOVEMENT_WORDS, -1,
                extend_selection);
            handled = TRUE;
        }
        else {
            gnome_canvas_rich_text_move_cursor(
                text, GTK_MOVEMENT_VISUAL_POSITIONS, -1,
                extend_selection);
            handled = TRUE;
        }
        break;
    case GDK_f:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_move_cursor(
                text, GTK_MOVEMENT_LOGICAL_POSITIONS, 1,
                extend_selection);
            handled = TRUE;
        }
        else if (event->state & GDK_MOD1_MASK) {
            gnome_canvas_rich_text_move_cursor(
                text, GTK_MOVEMENT_WORDS, 1,
                extend_selection);
            handled = TRUE;
        }
        break;
    case GDK_b:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_move_cursor(
                text, GTK_MOVEMENT_LOGICAL_POSITIONS, -1,
                extend_selection);
            handled = TRUE;
        }
        else if (event->state & GDK_MOD1_MASK) {
            gnome_canvas_rich_text_move_cursor(
                text, GTK_MOVEMENT_WORDS, -1,
                extend_selection);
            handled = TRUE;
        }
        break;
    case GDK_Up:
        gnome_canvas_rich_text_move_cursor(
            text, GTK_MOVEMENT_DISPLAY_LINES, -1,
            extend_selection);
        handled = TRUE;
        break;
    case GDK_Down:
        gnome_canvas_rich_text_move_cursor(
            text, GTK_MOVEMENT_DISPLAY_LINES, 1,
            extend_selection);
        handled = TRUE;
        break;
    case GDK_p:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_move_cursor(
                text, GTK_MOVEMENT_DISPLAY_LINES, -1,
                extend_selection);
            handled = TRUE;
        }
        break;
    case GDK_n:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_move_cursor(
                text, GTK_MOVEMENT_DISPLAY_LINES, 1,
                extend_selection);
            handled = TRUE;
        }
        break;
    case GDK_Home:
        gnome_canvas_rich_text_move_cursor(
            text, GTK_MOVEMENT_PARAGRAPH_ENDS, -1,
            extend_selection);
        handled = TRUE;
        break;
    case GDK_End:
        gnome_canvas_rich_text_move_cursor(
            text, GTK_MOVEMENT_PARAGRAPH_ENDS, 1,
            extend_selection);
        handled = TRUE;
        break;
    case GDK_a:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_move_cursor(
                text, GTK_MOVEMENT_PARAGRAPH_ENDS, -1,
                extend_selection);
            handled = TRUE;
        }
        break;
    case GDK_e:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_move_cursor(
                text, GTK_MOVEMENT_PARAGRAPH_ENDS, 1,
                extend_selection);
            handled = TRUE;
        }
        break;

    /* DELETING TEXT */
    case GDK_Delete:
    case GDK_KP_Delete:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_delete_from_cursor(
                text, GTK_DELETE_WORD_ENDS, 1);
            handled = TRUE;
        }
        else {
            gnome_canvas_rich_text_delete_from_cursor(
                text, GTK_DELETE_CHARS, 1);
            handled = TRUE;
        }
        break;
    case GDK_d:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_delete_from_cursor(
                text, GTK_DELETE_CHARS, 1);
            handled = TRUE;
        }
        else if (event->state & GDK_MOD1_MASK) {
            gnome_canvas_rich_text_delete_from_cursor(
                text, GTK_DELETE_WORD_ENDS, 1);
            handled = TRUE;
        }
        break;
    case GDK_BackSpace:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_delete_from_cursor(
                text, GTK_DELETE_WORD_ENDS, -1);
            handled = TRUE;
        }
        else {
            gnome_canvas_rich_text_delete_from_cursor(
                text, GTK_DELETE_CHARS, -1);
        }
        handled = TRUE;
        break;
    case GDK_k:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_delete_from_cursor(
                text, GTK_DELETE_PARAGRAPH_ENDS, 1);
            handled = TRUE;
        }
        break;
    case GDK_u:
        if (event->state & GDK_CONTROL_MASK) {
            gnome_canvas_rich_text_delete_from_cursor(
                text, GTK_DELETE_PARAGRAPHS, 1);
            handled = TRUE;
        }
        break;
    case GDK_space:
        if (event->state & GDK_MOD1_MASK) {
            gnome_canvas_rich_text_delete_from_cursor(
                text, GTK_DELETE_WHITESPACE, 1);
            handled = TRUE;
        }
        break;
    case GDK_backslash:
        if (event->state & GDK_MOD1_MASK) {
            gnome_canvas_rich_text_delete_from_cursor(
                text, GTK_DELETE_WHITESPACE, 1);
            handled = TRUE;
        }
        break;
    default:
        break;
    }

    /* An empty string, click just pressing "Alt" by itself or whatever. */
    if (!event->length)
        return FALSE;

    if (!handled) {
        gtk_text_buffer_delete_selection(
            get_buffer(text), TRUE, text->_priv->editable);
        gtk_text_buffer_insert_interactive_at_cursor(
            get_buffer(text), event->string, event->length,
            text->_priv->editable);
    }

    gnome_canvas_rich_text_start_cursor_blink(text, TRUE);
    
    return TRUE;
} /* gnome_canvas_rich_text_key_press_event */

static gint
gnome_canvas_rich_text_key_release_event(GnomeCanvasItem *item, 
                     GdkEventKey *event)
{
    return FALSE;
} /* gnome_canvas_rich_text_key_release_event */

static gboolean
_click(gpointer data)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(data);

    text->_priv->clicks = 0;
    text->_priv->click_timeout = 0;

    return FALSE;
} /* _click */

static gint
gnome_canvas_rich_text_button_press_event(GnomeCanvasItem *item,
                      GdkEventButton *event)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(item);
    GtkTextIter iter;
    GdkEventType event_type;
    double newx, newy;

    newx = (event->x - text->_priv->x) * item->canvas->pixels_per_unit;
    newy = (event->y - text->_priv->y) * item->canvas->pixels_per_unit;
    
    gtk_text_layout_get_iter_at_pixel(text->_priv->layout, &iter, newx, newy);

    /* The canvas doesn't give us double- or triple-click events, so
       we have to synthesize them ourselves. Yay. */
    event_type = event->type;
    if (event_type == GDK_BUTTON_PRESS) {
        text->_priv->clicks++;
        text->_priv->click_timeout = g_timeout_add(400, _click, text);

        if (text->_priv->clicks > 3)
            text->_priv->clicks = text->_priv->clicks % 3;

        if (text->_priv->clicks == 1)
            event_type = GDK_BUTTON_PRESS;
        else if (text->_priv->clicks == 2)
            event_type = GDK_2BUTTON_PRESS;
        else if (text->_priv->clicks == 3)
            event_type = GDK_3BUTTON_PRESS;
        else
            printf("ZERO CLICKS!\n");
    }

    if (event->button == 1 && event_type == GDK_BUTTON_PRESS) {
        GtkTextIter start, end;

        if (gtk_text_buffer_get_selection_bounds(
                get_buffer(text), &start, &end) &&
            gtk_text_iter_in_range(&iter, &start, &end)) {
            text->_priv->drag_start_x = event->x;
            text->_priv->drag_start_y = event->y;
        }
        else {
            gnome_canvas_rich_text_start_selection_drag(
                text, &iter, event);
        }

        return TRUE;
    }
    else if (event->button == 1 && event_type == GDK_2BUTTON_PRESS) {
        GtkTextIter start, end;

#if 0
        printf("double-click\n");
#endif
        
        gnome_canvas_rich_text_end_selection_drag(text, event);

        start = iter;
        end = start;

        if (gtk_text_iter_inside_word(&start)) {
            if (!gtk_text_iter_starts_word(&start))
                gtk_text_iter_backward_word_start(&start);
            
            if (!gtk_text_iter_ends_word(&end))
                gtk_text_iter_forward_word_end(&end);
        }

        gtk_text_buffer_move_mark(
            get_buffer(text),
            gtk_text_buffer_get_selection_bound(get_buffer(text)),
            &start);
        gtk_text_buffer_move_mark(
            get_buffer(text),
            gtk_text_buffer_get_insert(get_buffer(text)), &end);

        text->_priv->just_selected_element = TRUE;

        return TRUE;
    }
    else if (event->button == 1 && event_type == GDK_3BUTTON_PRESS) {
        GtkTextIter start, end;

#if 0
        printf("triple-click\n");
#endif

        gnome_canvas_rich_text_end_selection_drag(text, event);

        start = iter;
        end = start;

        if (gtk_text_layout_iter_starts_line(text->_priv->layout, &start)) {
            gtk_text_layout_move_iter_to_line_end(
                text->_priv->layout, &start, -1);
        }
        else {
            gtk_text_layout_move_iter_to_line_end(
                text->_priv->layout, &start, -1);

            if (!gtk_text_layout_iter_starts_line(
                    text->_priv->layout, &end)) {
                gtk_text_layout_move_iter_to_line_end(
                    text->_priv->layout, &end, 1);
            }
        }

        gtk_text_buffer_move_mark(
            get_buffer(text),
            gtk_text_buffer_get_selection_bound(get_buffer(text)),
            &start);
        gtk_text_buffer_move_mark(
            get_buffer(text),
            gtk_text_buffer_get_insert(get_buffer(text)), &end);

        text->_priv->just_selected_element = TRUE;

        return TRUE;
    }
    else if (event->button == 2 && event_type == GDK_BUTTON_PRESS) {
        gtk_text_buffer_paste_clipboard(
            get_buffer(text),
            gtk_clipboard_get (GDK_SELECTION_PRIMARY),
            &iter, text->_priv->editable);
    }
        
    return FALSE;
} /* gnome_canvas_rich_text_button_press_event */

static gint
gnome_canvas_rich_text_button_release_event(GnomeCanvasItem *item,
                        GdkEventButton *event)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(item);
    double newx, newy;

    newx = (event->x - text->_priv->x) * item->canvas->pixels_per_unit;
    newy = (event->y - text->_priv->y) * item->canvas->pixels_per_unit;
    
    if (event->button == 1) {
        if (text->_priv->drag_start_x >= 0) {
            text->_priv->drag_start_x = -1;
            text->_priv->drag_start_y = -1;
        }

        if (gnome_canvas_rich_text_end_selection_drag(text, event))
            return TRUE;
        else if (text->_priv->just_selected_element) {
            text->_priv->just_selected_element = FALSE;
            return FALSE;
        }
        else {
            GtkTextIter iter;

            gtk_text_layout_get_iter_at_pixel(
                text->_priv->layout, &iter, newx, newy);

            gtk_text_buffer_place_cursor(get_buffer(text), &iter);

            return FALSE;
        }
    }

    return FALSE;
} /* gnome_canvas_rich_text_button_release_event */

static gint
gnome_canvas_rich_text_focus_in_event(GnomeCanvasItem *item,
                      GdkEventFocus *event)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(item);

    if (text->_priv->cursor_visible && text->_priv->layout) {
        gtk_text_layout_set_cursor_visible(text->_priv->layout, TRUE);
        gnome_canvas_rich_text_start_cursor_blink(text, FALSE);
    }

    return FALSE;
} /* gnome_canvas_rich_text_focus_in_event */

static gint
gnome_canvas_rich_text_focus_out_event(GnomeCanvasItem *item,
                       GdkEventFocus *event)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(item);

    if (text->_priv->cursor_visible && text->_priv->layout) {
        gtk_text_layout_set_cursor_visible(text->_priv->layout, FALSE);
        gnome_canvas_rich_text_stop_cursor_blink(text);
    }

    return FALSE;
} /* gnome_canvas_rich_text_focus_out_event */

static gboolean
get_event_coordinates(GdkEvent *event, gint *x, gint *y)
{
    g_return_val_if_fail(event, FALSE);
    
    switch (event->type) {
    case GDK_MOTION_NOTIFY:
        *x = event->motion.x;
        *y = event->motion.y;
        return TRUE;
    case GDK_BUTTON_PRESS:
    case GDK_2BUTTON_PRESS:
    case GDK_3BUTTON_PRESS:
    case GDK_BUTTON_RELEASE:
        *x = event->button.x;
        *y = event->button.y;
        return TRUE;

    default:
        return FALSE;
    }
} /* get_event_coordinates */

static void
emit_event_on_tags(GnomeCanvasRichText *text, GdkEvent *event, 
           GtkTextIter *iter)
{
    GSList *tags;
    GSList *i;
    
    tags = gtk_text_iter_get_tags(iter);

    i = tags;
    while (i) {
        GtkTextTag *tag = i->data;

        gtk_text_tag_event(tag, G_OBJECT(text), event, iter);

        /* The cursor has been moved to within this tag. Emit the
           tag_changed signal */
        if (event->type == GDK_BUTTON_RELEASE || 
            event->type == GDK_KEY_PRESS ||
            event->type == GDK_KEY_RELEASE) {
            gnome_canvas_rich_text_emit_tag_changed(
                text, tag);
        }

        i = g_slist_next(i);
    }

    g_slist_free(tags);
} /* emit_event_on_tags */

static gint
gnome_canvas_rich_text_event(GnomeCanvasItem *item, GdkEvent *event)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(item);
    int x, y;

    if (get_event_coordinates(event, &x, &y)) {
        GtkTextIter iter;

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

        gtk_text_layout_get_iter_at_pixel(text->_priv->layout, &iter, x, y);
        emit_event_on_tags(text, event, &iter);
    }
    else if (event->type == GDK_KEY_PRESS ||
         event->type == GDK_KEY_RELEASE) {
        GtkTextMark *insert;
        GtkTextIter iter;

        insert = gtk_text_buffer_get_mark(get_buffer(text), "insert");
        gtk_text_buffer_get_iter_at_mark(
            get_buffer(text), &iter, insert);
        emit_event_on_tags(text, event, &iter);
    }

    switch (event->type) {
    case GDK_KEY_PRESS:
        return gnome_canvas_rich_text_key_press_event(
            item, (GdkEventKey *) event);
    case GDK_KEY_RELEASE:
        return gnome_canvas_rich_text_key_release_event(
            item, (GdkEventKey *) event);
    case GDK_BUTTON_PRESS:
        return gnome_canvas_rich_text_button_press_event(
            item, (GdkEventButton *) event);
    case GDK_BUTTON_RELEASE:
        return gnome_canvas_rich_text_button_release_event(
            item, (GdkEventButton *) event);
    case GDK_FOCUS_CHANGE:
        if (((GdkEventFocus *) event)->window !=
            item->canvas->layout.bin_window)
            return FALSE;

        if (((GdkEventFocus *) event)->in)
            return gnome_canvas_rich_text_focus_in_event(
                item, (GdkEventFocus *) event);
        else
            return gnome_canvas_rich_text_focus_out_event(
                item, (GdkEventFocus *) event);
    default:
        return FALSE;
    }
} /* gnome_canvas_rich_text_event */

/* Cut/Copy/Paste */

/**
 * gnome_canvas_rich_text_cut_clipboard:
 * @text: a #GnomeCanvasRichText.
 * 
 * Copies the currently selected @text to clipboard, then deletes said text
 * if it's editable.
 **/
void
gnome_canvas_rich_text_cut_clipboard(GnomeCanvasRichText *text)
{
    g_return_if_fail(text);
    g_return_if_fail(get_buffer(text));

    gtk_text_buffer_cut_clipboard(get_buffer(text),
                      gtk_clipboard_get (GDK_SELECTION_PRIMARY),
                      text->_priv->editable);
} /* gnome_canvas_rich_text_cut_clipboard */


/**
 * gnome_canvas_rich_text_copy_clipboard:
 * @text: a #GnomeCanvasRichText.
 *
 * Copies the currently selected @text to clipboard.
 **/
void
gnome_canvas_rich_text_copy_clipboard(GnomeCanvasRichText *text)
{
    g_return_if_fail(text);
    g_return_if_fail(get_buffer(text));

    gtk_text_buffer_copy_clipboard(get_buffer(text),
                       gtk_clipboard_get (GDK_SELECTION_PRIMARY));
} /* gnome_canvas_rich_text_cut_clipboard */


/**
 * gnome_canvas_rich_text_paste_clipboard:
 * @text: a #GnomeCanvasRichText.
 *
 * Pastes the contents of the clipboard at the insertion point.
 **/
void
gnome_canvas_rich_text_paste_clipboard(GnomeCanvasRichText *text)
{
    g_return_if_fail(text);
    g_return_if_fail(get_buffer(text));

    gtk_text_buffer_paste_clipboard(get_buffer(text),
                    gtk_clipboard_get (GDK_SELECTION_PRIMARY),
                    NULL,
                    text->_priv->editable);
} /* gnome_canvas_rich_text_cut_clipboard */

static gint
preblink_cb(gpointer data)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(data);

    text->_priv->preblink_timeout = 0;
    gnome_canvas_rich_text_start_cursor_blink(text, FALSE);

    /* Remove ourselves */
    return FALSE;
} /* preblink_cb */

static gint
blink_cb(gpointer data)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(data);
    gboolean visible;

    g_assert(text->_priv->layout);
    g_assert(text->_priv->cursor_visible);

    visible = gtk_text_layout_get_cursor_visible(text->_priv->layout);
    if (visible)
        text->_priv->blink_timeout = g_timeout_add(
            CURSOR_OFF_TIME, blink_cb, text);
    else
        text->_priv->blink_timeout = g_timeout_add(
            CURSOR_ON_TIME, blink_cb, text);

    gtk_text_layout_set_cursor_visible(text->_priv->layout, !visible);

    /* Remove ourself */
    return FALSE;
} /* blink_cb */

static void
gnome_canvas_rich_text_start_cursor_blink(GnomeCanvasRichText *text,
                      gboolean with_delay)
{
    if (!text->_priv->layout)
        return;

    if (!text->_priv->cursor_visible || !text->_priv->cursor_blink)
        return;

    if (text->_priv->preblink_timeout != 0) {
        g_source_remove(text->_priv->preblink_timeout);
        text->_priv->preblink_timeout = 0;
    }

    if (with_delay) {
        if (text->_priv->blink_timeout != 0) {
            g_source_remove(text->_priv->blink_timeout);
            text->_priv->blink_timeout = 0;
        }

        gtk_text_layout_set_cursor_visible(text->_priv->layout, TRUE);

        text->_priv->preblink_timeout = g_timeout_add(
            PREBLINK_TIME, preblink_cb, text);
    }
    else {
        if (text->_priv->blink_timeout == 0) {
            gtk_text_layout_set_cursor_visible(text->_priv->layout, TRUE);
            text->_priv->blink_timeout = g_timeout_add(
                CURSOR_ON_TIME, blink_cb, text);
        }
    }
} /* gnome_canvas_rich_text_start_cursor_blink */

static void
gnome_canvas_rich_text_stop_cursor_blink(GnomeCanvasRichText *text)
{
    if (text->_priv->blink_timeout) {
        g_source_remove(text->_priv->blink_timeout);
        text->_priv->blink_timeout = 0;
    }
} /* gnome_canvas_rich_text_stop_cursor_blink */

/* We have to request updates this way because the update cycle is not
   re-entrant. This will fire off a request in an idle loop. */
static gboolean
request_update(gpointer data)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(data);

    gnome_canvas_item_request_update(GNOME_CANVAS_ITEM(text));

    return FALSE;
} /* request_update */

static void
invalidated_handler(GtkTextLayout *layout, gpointer data)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(data);

#if 0
    printf("Text is being invalidated.\n");
#endif

    gtk_text_layout_validate(text->_priv->layout, 2000);

    /* We are called from the update cycle; gotta put this in an idle
       loop. */
    g_idle_add(request_update, text);
} /* invalidated_handler */

static void
scale_fonts(GtkTextTag *tag, gpointer data)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(data);

    if (!tag->values)
        return;

    g_object_set(
        G_OBJECT(tag), "scale", 
        text->_priv->layout->default_style->font_scale, NULL);
} /* scale_fonts */

static void
changed_handler(GtkTextLayout *layout, gint start_y, 
        gint old_height, gint new_height, gpointer data)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(data);

#if 0
    printf("Layout %p is being changed.\n", text->_priv->layout);
#endif

    if (text->_priv->layout->default_style->font_scale != 
        GNOME_CANVAS_ITEM(text)->canvas->pixels_per_unit) {
        GtkTextTagTable *tag_table;

        text->_priv->layout->default_style->font_scale = 
            GNOME_CANVAS_ITEM(text)->canvas->pixels_per_unit;

        tag_table = gtk_text_buffer_get_tag_table(get_buffer(text));
        gtk_text_tag_table_foreach(tag_table, scale_fonts, text);

        gtk_text_layout_default_style_changed(text->_priv->layout);
    }

    if (text->_priv->grow_height) {
        int width, height;

        gtk_text_layout_get_size(text->_priv->layout, &width, &height);

        if (height > text->_priv->height)
            text->_priv->height = height;
    }

    /* We are called from the update cycle; gotta put this in an idle
       loop. */
    g_idle_add(request_update, text);
} /* changed_handler */


/**
 * gnome_canvas_rich_text_set_buffer:
 * @text: a #GnomeCanvasRichText.
 * @buffer: a #GtkTextBuffer.
 *
 * Sets the buffer field of the @text to @buffer. 
 **/ 
void
gnome_canvas_rich_text_set_buffer(GnomeCanvasRichText *text, 
                  GtkTextBuffer *buffer)
{
    g_return_if_fail(GNOME_IS_CANVAS_RICH_TEXT(text));
    g_return_if_fail(buffer == NULL || GTK_IS_TEXT_BUFFER(buffer));

    if (text->_priv->buffer == buffer)
        return;

    if (text->_priv->buffer != NULL) {
        g_object_unref(G_OBJECT(text->_priv->buffer));
    }

    text->_priv->buffer = buffer;

    if (buffer) {
        g_object_ref(G_OBJECT(buffer));

        if (text->_priv->layout)
            gtk_text_layout_set_buffer(text->_priv->layout, buffer);
    }

    gnome_canvas_item_request_update(GNOME_CANVAS_ITEM(text));
} /* gnome_canvas_rich_text_set_buffer */

static GtkTextBuffer *
get_buffer(GnomeCanvasRichText *text)
{
    if (!text->_priv->buffer) {
        GtkTextBuffer *b;

        b = gtk_text_buffer_new(NULL);
        gnome_canvas_rich_text_set_buffer(text, b);
        g_object_unref(G_OBJECT(b));
    }

    return text->_priv->buffer;
} /* get_buffer */


/**
 * gnome_canvas_rich_text_get_buffer:
 * @text: a #GnomeCanvasRichText.
 *
 * Returns a #GtkTextBuffer associated with the #GnomeCanvasRichText.
 * This function creates a new #GtkTextBuffer if the text buffer is NULL.
 *
 * Return value: the #GtkTextBuffer.
 **/
GtkTextBuffer *
gnome_canvas_rich_text_get_buffer(GnomeCanvasRichText *text)
{
    g_return_val_if_fail(GNOME_IS_CANVAS_RICH_TEXT(text), NULL);

    return get_buffer(text);
} /* gnome_canvas_rich_text_get_buffer */


/**
 * gnome_canvas_rich_text_get_iter_location:
 * @text: a #GnomeCanvasRichText.
 * @iter: a #GtkTextIter.
 * @location: a #GdkRectangle containing the bounds of the character at @iter.
 *
 * Gets a rectangle which roughly contains the character at @iter.
 **/
void
gnome_canvas_rich_text_get_iter_location (GnomeCanvasRichText *text,
                      const GtkTextIter *iter,
                      GdkRectangle      *location)
{
  g_return_if_fail (GNOME_IS_CANVAS_RICH_TEXT (text));
  g_return_if_fail (gtk_text_iter_get_buffer (iter) == text->_priv->buffer);

  gtk_text_layout_get_iter_location (text->_priv->layout, iter, location);
}


/**
 * gnome_canvas_rich_text_get_iter_at_location:
 * @text: a #GnomeCanvasRichText.
 * @iter: a #GtkTextIter.
 * @x: x position, in buffer coordinates.
 * @y: y position, in buffer coordinates.
 *
 * Retrieves the iterator at the buffer coordinates x and y. 
 **/ 
void
gnome_canvas_rich_text_get_iter_at_location (GnomeCanvasRichText *text,
                                    GtkTextIter *iter,
                                    gint         x,
                                    gint         y)
{
  g_return_if_fail (GNOME_IS_CANVAS_RICH_TEXT (text));
  g_return_if_fail (iter != NULL);
  g_return_if_fail (text->_priv->layout != NULL);

  gtk_text_layout_get_iter_at_pixel (text->_priv->layout,
                                     iter,
                                     x,
                                     y);
}


static void
gnome_canvas_rich_text_set_attributes_from_style(GnomeCanvasRichText *text,
                         GtkTextAttributes *values,
                         GtkStyle *style)
{
    values->appearance.bg_color = style->base[GTK_STATE_NORMAL];
    values->appearance.fg_color = style->fg[GTK_STATE_NORMAL];
    
    if (values->font)
        pango_font_description_free (values->font);

    values->font = pango_font_description_copy (style->font_desc);

} /* gnome_canvas_rich_text_set_attributes_from_style */

static void
gnome_canvas_rich_text_ensure_layout(GnomeCanvasRichText *text)
{
    if (!text->_priv->layout) {
        GtkWidget *canvas;
        GtkTextAttributes *style;
        PangoContext *ltr_context, *rtl_context;

        text->_priv->layout = gtk_text_layout_new();

        gtk_text_layout_set_screen_width(text->_priv->layout, text->_priv->width);

        if (get_buffer(text)) {
            gtk_text_layout_set_buffer(
                text->_priv->layout, get_buffer(text));
        }

        /* Setup the cursor stuff */
        gtk_text_layout_set_cursor_visible(
            text->_priv->layout, text->_priv->cursor_visible);
        if (text->_priv->cursor_visible && text->_priv->cursor_blink)
            gnome_canvas_rich_text_start_cursor_blink(text, FALSE);
        else
            gnome_canvas_rich_text_stop_cursor_blink(text);

        canvas = GTK_WIDGET(GNOME_CANVAS_ITEM(text)->canvas);

        ltr_context = gtk_widget_create_pango_context(canvas);
        pango_context_set_base_dir(ltr_context, PANGO_DIRECTION_LTR);
        rtl_context = gtk_widget_create_pango_context(canvas);
        pango_context_set_base_dir(rtl_context, PANGO_DIRECTION_RTL);

        gtk_text_layout_set_contexts(
            text->_priv->layout, ltr_context, rtl_context);

        g_object_unref(G_OBJECT(ltr_context));
        g_object_unref(G_OBJECT(rtl_context));

        style = gtk_text_attributes_new();

        gnome_canvas_rich_text_set_attributes_from_style(
            text, style, canvas->style);

        style->pixels_above_lines = text->_priv->pixels_above_lines;
        style->pixels_below_lines = text->_priv->pixels_below_lines;
        style->pixels_inside_wrap = text->_priv->pixels_inside_wrap;
        style->left_margin = text->_priv->left_margin;
        style->right_margin = text->_priv->right_margin;
        style->indent = text->_priv->indent;
        style->tabs = NULL;
        style->wrap_mode = text->_priv->wrap_mode;
        style->justification = text->_priv->justification;
        style->direction = text->_priv->direction;
        style->editable = text->_priv->editable;
        style->invisible = !text->_priv->visible;

        gtk_text_layout_set_default_style(text->_priv->layout, style);

        gtk_text_attributes_unref(style);

        g_signal_connect(
            G_OBJECT(text->_priv->layout), "invalidated",
            G_CALLBACK (invalidated_handler), text);

        g_signal_connect(
            G_OBJECT(text->_priv->layout), "changed",
            G_CALLBACK (changed_handler), text);
    }
} /* gnome_canvas_rich_text_ensure_layout */

static void
gnome_canvas_rich_text_destroy_layout(GnomeCanvasRichText *text)
{
    if (text->_priv->layout) {
        g_signal_handlers_disconnect_by_func(
            G_OBJECT(text->_priv->layout), invalidated_handler, text);
        g_signal_handlers_disconnect_by_func(
            G_OBJECT(text->_priv->layout), changed_handler, text);
        g_object_unref(G_OBJECT(text->_priv->layout));
        text->_priv->layout = NULL;
    }
} /* gnome_canvas_rich_text_destroy_layout */

static void
adjust_for_anchors(GnomeCanvasRichText *text, double *ax, double *ay)
{
    double x, y;

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

    /* Anchor text */
    /* X coordinates */
    switch (text->_priv->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->_priv->width / 2;
        break;

    case GTK_ANCHOR_NE:
    case GTK_ANCHOR_E:
    case GTK_ANCHOR_SE:
        x -= text->_priv->width;
        break;
    default:
        break;
    }

    /* Y coordinates */
    switch (text->_priv->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->_priv->height / 2;
        break;

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

    if (ax)
        *ax = x;
    if (ay)
        *ay = y;
} /* adjust_for_anchors */

static void
get_bounds(GnomeCanvasRichText *text, double *px1, double *py1,
       double *px2, double *py2)
{
    GnomeCanvasItem *item = GNOME_CANVAS_ITEM(text);
    double x, y;
    double x1, x2, y1, y2;
    int cx1, cx2, cy1, cy2;

    adjust_for_anchors(text, &x, &y);

    x1 = x;
    y1 = y;
    x2 = x + text->_priv->width;
    y2 = y + text->_priv->height;

    gnome_canvas_item_i2w(item, &x1, &y1);
    gnome_canvas_item_i2w(item, &x2, &y2);
    gnome_canvas_w2c(item->canvas, x1, y1, &cx1, &cy1);
    gnome_canvas_w2c(item->canvas, x2, y2, &cx2, &cy2);

    *px1 = cx1;
    *py1 = cy1;
    *px2 = cx2;
    *py2 = cy2;
} /* get_bounds */

static void gnome_canvas_rich_text_get_bounds(GnomeCanvasItem *item, double *px1, double *py1,
       double *px2, double *py2)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(item);
    get_bounds (text, px1, py1, px2, py2);
}

static void
gnome_canvas_rich_text_update(GnomeCanvasItem *item, double *affine,
                  ArtSVP *clip_path, int flags)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(item);
    double x1, y1, x2, y2;
    GtkTextIter start;

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

    get_bounds(text, &x1, &y1, &x2, &y2);

    gtk_text_buffer_get_iter_at_offset(text->_priv->buffer, &start, 0);
    if (text->_priv->layout)
        gtk_text_layout_validate_yrange(
            text->_priv->layout, &start, 0, y2 - y1);

    gnome_canvas_update_bbox(item, x1, y1, x2, y2);
} /* gnome_canvas_rich_text_update */
                              
static double
gnome_canvas_rich_text_point(GnomeCanvasItem *item, double x, double y,
                 int cx, int cy, GnomeCanvasItem **actual_item)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(item);
    double ax, ay;
    double x1, x2, y1, y2;
    double dx, dy;

    *actual_item = item;

    /* This is a lame cop-out. Anywhere inside of the bounding box. */

    adjust_for_anchors(text, &ax, &ay);

    x1 = ax;
    y1 = ay;
    x2 = ax + text->_priv->width;
    y2 = ay + text->_priv->height;

    if ((x > x1) && (y > y1) && (x < x2) && (y < y2))
        return 0.0;

    if (x < x1)
        dx = x1 - x;
    else if (x > x2)
        dx = x - x2;
    else
        dx = 0.0;

    if (y < y1)
        dy = y1 - y;
    else if (y > y2)
        dy = y - y2;
    else
        dy = 0.0;

    return sqrt(dx * dx + dy * dy);
} /* gnome_canvas_rich_text_point */

static void
gnome_canvas_rich_text_draw(GnomeCanvasItem *item, GdkDrawable *drawable,
                int x, int y, int width, int height)
{
    GnomeCanvasRichText *text = GNOME_CANVAS_RICH_TEXT(item);
    double i2w[6], w2c[6], i2c[6];
    double ax, ay;
    int x1, y1, x2, y2;
    ArtPoint i1, i2;
    ArtPoint c1, c2;

    gnome_canvas_item_i2w_affine(item, i2w);
    gnome_canvas_w2c_affine(item->canvas, w2c);
    art_affine_multiply(i2c, i2w, w2c);

    adjust_for_anchors(text, &ax, &ay);

    i1.x = ax;
    i1.y = ay;
    i2.x = ax + text->_priv->width;
    i2.y = ay + text->_priv->height;
    art_affine_point(&c1, &i1, i2c);
    art_affine_point(&c2, &i2, i2c);

    x1 = c1.x;
    y1 = c1.y;
    x2 = c2.x;
    y2 = c2.y;

    gtk_text_layout_set_screen_width(text->_priv->layout, x2 - x1);
      
        /* FIXME: should last arg be NULL? */
    gtk_text_layout_draw(
        text->_priv->layout,
        GTK_WIDGET(item->canvas),
        drawable,
        GTK_WIDGET (item->canvas)->style->text_gc[GTK_STATE_NORMAL],
        x - x1, y - y1,
        0, 0, (x2 - x1) - (x - x1), (y2 - y1) - (y - y1),
        NULL);
} /* gnome_canvas_rich_text_draw */

static void
gnome_canvas_rich_text_render(GnomeCanvasItem *item, GnomeCanvasBuf *buf)
{
    g_warning ("rich text item not implemented for anti-aliased canvas");
} /* gnome_canvas_rich_text_render */

#if 0
static GtkTextTag *
gnome_canvas_rich_text_add_tag(GnomeCanvasRichText *text, char *tag_name,
                   int start_offset, int end_offset, 
                   const char *first_property_name, ...)
{
    GtkTextTag *tag;
    GtkTextIter start, end;
    va_list var_args;

    g_return_val_if_fail(text, NULL);
    g_return_val_if_fail(start_offset >= 0, NULL);
    g_return_val_if_fail(end_offset >= 0, NULL);

    if (tag_name) {
        GtkTextTagTable *tag_table;

        tag_table = gtk_text_buffer_get_tag_table(get_buffer(text));
        g_return_val_if_fail(gtk_text_tag_table_lookup(tag_table, tag_name) == NULL, NULL);
    }

    tag = gtk_text_buffer_create_tag(
        get_buffer(text), tag_name, NULL);

    va_start(var_args, first_property_name);
    g_object_set_valist(G_OBJECT(tag), first_property_name, var_args);
    va_end(var_args);

    gtk_text_buffer_get_iter_at_offset(
        get_buffer(text), &start, start_offset);
    gtk_text_buffer_get_iter_at_offset(
        get_buffer(text), &end, end_offset);
    gtk_text_buffer_apply_tag(get_buffer(text), tag, &start, &end);

    return tag;
} /* gnome_canvas_rich_text_add_tag */
#endif