path: root/e-util/e-reflow.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 *
 * Authors:
 *              Chris Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 */

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

#include "e-reflow.h"

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

#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <gdk/gdkkeysyms.h>

#include "e-canvas-utils.h"
#include "e-canvas.h"
#include "e-marshal.h"
#include "e-selection-model-simple.h"
#include "e-text.h"
#include "e-unicode.h"

static gboolean e_reflow_event (GnomeCanvasItem *item, GdkEvent *event);
static void e_reflow_realize (GnomeCanvasItem *item);
static void e_reflow_unrealize (GnomeCanvasItem *item);
static void e_reflow_draw (GnomeCanvasItem *item, cairo_t *cr,
                    gint x, gint y, gint width, gint height);
static void e_reflow_update (GnomeCanvasItem *item, const cairo_matrix_t *i2c, gint flags);
static GnomeCanvasItem *e_reflow_point (GnomeCanvasItem *item, gdouble x, gdouble y, gint cx, gint cy);
static void e_reflow_reflow (GnomeCanvasItem *item, gint flags);
static void set_empty (EReflow *reflow);

static void e_reflow_resize_children (GnomeCanvasItem *item);

#define E_REFLOW_DIVIDER_WIDTH 2
#define E_REFLOW_BORDER_WIDTH 7
#define E_REFLOW_FULL_GUTTER (E_REFLOW_DIVIDER_WIDTH + E_REFLOW_BORDER_WIDTH * 2)

G_DEFINE_TYPE (EReflow, e_reflow, GNOME_TYPE_CANVAS_GROUP)

enum {
    PROP_0,
    PROP_MINIMUM_WIDTH,
    PROP_WIDTH,
    PROP_HEIGHT,
    PROP_EMPTY_MESSAGE,
    PROP_MODEL,
    PROP_COLUMN_WIDTH
};

enum {
    SELECTION_EVENT,
    COLUMN_WIDTH_CHANGED,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = {0, };

static GHashTable *
er_create_cmp_cache (gpointer user_data)
{
    EReflow *reflow = user_data;
    return e_reflow_model_create_cmp_cache (reflow->model);
}

static gint
er_compare (gint i1,
            gint i2,
            GHashTable *cmp_cache,
            gpointer user_data)
{
    EReflow *reflow = user_data;
    return e_reflow_model_compare (reflow->model, i1, i2, cmp_cache);
}

static gint
e_reflow_pick_line (EReflow *reflow,
                    gdouble x)
{
    x += E_REFLOW_BORDER_WIDTH + E_REFLOW_DIVIDER_WIDTH;
    x /= reflow->column_width + E_REFLOW_FULL_GUTTER;
    return x;
}

static gint
er_find_item (EReflow *reflow,
              GnomeCanvasItem *item)
{
    gint i;
    for (i = 0; i < reflow->count; i++) {
        if (reflow->items[i] == item)
            return i;
    }
    return -1;
}

static void
e_reflow_resize_children (GnomeCanvasItem *item)
{
    EReflow *reflow;
    gint i;
    gint count;

    reflow = E_REFLOW (item);

    count = reflow->count;
    for (i = 0; i < count; i++) {
        if (reflow->items[i])
            gnome_canvas_item_set (
                reflow->items[i],
                "width", (gdouble) reflow->column_width,
                NULL);
    }
}

static inline void
e_reflow_update_selection_row (EReflow *reflow,
                               gint row)
{
    if (reflow->items[row]) {
        g_object_set (
            reflow->items[row],
            "selected", e_selection_model_is_row_selected (E_SELECTION_MODEL (reflow->selection), row),
            NULL);
    } else if (e_selection_model_is_row_selected (E_SELECTION_MODEL (reflow->selection), row)) {
        reflow->items[row] = e_reflow_model_incarnate (reflow->model, row, GNOME_CANVAS_GROUP (reflow));
        g_object_set (
            reflow->items[row],
            "selected", e_selection_model_is_row_selected (E_SELECTION_MODEL (reflow->selection), row),
            "width", (gdouble) reflow->column_width,
            NULL);
    }
}

static void
e_reflow_update_selection (EReflow *reflow)
{
    gint i;
    gint count;

    count = reflow->count;
    for (i = 0; i < count; i++) {
        e_reflow_update_selection_row (reflow, i);
    }
}

static void
selection_changed (ESelectionModel *selection,
                   EReflow *reflow)
{
    e_reflow_update_selection (reflow);
}

static void
selection_row_changed (ESelectionModel *selection,
                       gint row,
                       EReflow *reflow)
{
    e_reflow_update_selection_row (reflow, row);
}

static gboolean
do_adjustment (gpointer user_data)
{
    gint row;
    GtkLayout *layout;
    GtkAdjustment *adjustment;
    gdouble page_size;
    gdouble value, min_value, max_value;
    EReflow *reflow = user_data;

    row = reflow->cursor_row;
    if (row == -1)
        return FALSE;

    layout = GTK_LAYOUT (GNOME_CANVAS_ITEM (reflow)->canvas);
    adjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (layout));

    value = gtk_adjustment_get_value (adjustment);
    page_size = gtk_adjustment_get_page_size (adjustment);

    if ((!reflow->items) || (!reflow->items[row]))
        return TRUE;
    min_value = reflow->items[row]->x2 - page_size;
    max_value = reflow->items[row]->x1;

    if (value < min_value)
        value = min_value;

    if (value > max_value)
        value = max_value;

    if (value != gtk_adjustment_get_value (adjustment))
        gtk_adjustment_set_value (adjustment, value);

    reflow->do_adjustment_idle_id = 0;

    return FALSE;
}

static void
cursor_changed (ESelectionModel *selection,
                gint row,
                gint col,
                EReflow *reflow)
{
    gint count = reflow->count;
    gint old_cursor = reflow->cursor_row;

    if (old_cursor < count && old_cursor >= 0) {
        if (reflow->items[old_cursor]) {
            g_object_set (
                reflow->items[old_cursor],
                "has_cursor", FALSE,
                NULL);
        }
    }

    reflow->cursor_row = row;

    if (row < count && row >= 0) {
        if (reflow->items[row]) {
            g_object_set (
                reflow->items[row],
                "has_cursor", TRUE,
                NULL);
        } else {
            reflow->items[row] = e_reflow_model_incarnate (reflow->model, row, GNOME_CANVAS_GROUP (reflow));
            g_object_set (
                reflow->items[row],
                "has_cursor", TRUE,
                "width", (gdouble) reflow->column_width,
                NULL);
        }
    }

    if (reflow->do_adjustment_idle_id == 0)
        reflow->do_adjustment_idle_id = g_idle_add (do_adjustment, reflow);

}

static void
incarnate (EReflow *reflow)
{
    gint column_width;
    gint first_column;
    gint last_column;
    gint first_cell;
    gint last_cell;
    gint i;
    GtkLayout *layout;
    GtkAdjustment *adjustment;
    gdouble value;
    gdouble page_size;

    layout = GTK_LAYOUT (GNOME_CANVAS_ITEM (reflow)->canvas);
    adjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (layout));

    value = gtk_adjustment_get_value (adjustment);
    page_size = gtk_adjustment_get_page_size (adjustment);

    column_width = reflow->column_width;

    first_column = value - 1 + E_REFLOW_BORDER_WIDTH;
    first_column /= column_width + E_REFLOW_FULL_GUTTER;

    last_column = value + page_size + 1 - E_REFLOW_BORDER_WIDTH - E_REFLOW_DIVIDER_WIDTH;
    last_column /= column_width + E_REFLOW_FULL_GUTTER;
    last_column++;

    if (first_column >= 0 && first_column < reflow->column_count)
        first_cell = reflow->columns[first_column];
    else
        first_cell = 0;

    if (last_column >= 0 && last_column < reflow->column_count)
        last_cell = reflow->columns[last_column];
    else
        last_cell = reflow->count;

    for (i = first_cell; i < last_cell; i++) {
        gint unsorted = e_sorter_sorted_to_model (E_SORTER (reflow->sorter), i);
        if (reflow->items[unsorted] == NULL) {
            if (reflow->model) {
                reflow->items[unsorted] = e_reflow_model_incarnate (reflow->model, unsorted, GNOME_CANVAS_GROUP (reflow));
                g_object_set (
                    reflow->items[unsorted],
                    "selected", e_selection_model_is_row_selected (E_SELECTION_MODEL (reflow->selection), unsorted),
                    "width", (gdouble) reflow->column_width,
                    NULL);
            }
        }
    }
    reflow->incarnate_idle_id = 0;
}

static gboolean
invoke_incarnate (gpointer user_data)
{
    EReflow *reflow = user_data;
    incarnate (reflow);
    return FALSE;
}

static void
queue_incarnate (EReflow *reflow)
{
    if (reflow->incarnate_idle_id == 0)
        reflow->incarnate_idle_id =
            g_idle_add_full (25, invoke_incarnate, reflow, NULL);
}

static void
reflow_columns (EReflow *reflow)
{
    GSList *list;
    gint count;
    gint start;
    gint i;
    gint column_count, column_start;
    gdouble running_height;

    if (reflow->reflow_from_column <= 1) {
        start = 0;
        column_count = 1;
        column_start = 0;
    }
    else {
        /* we start one column before the earliest new entry,
         * so we can handle the case where the new entry is
         * inserted at the start of the column */
        column_start = reflow->reflow_from_column - 1;
        start = reflow->columns[column_start];
        column_count = column_start + 1;
    }

    list = NULL;

    running_height = E_REFLOW_BORDER_WIDTH;

    count = reflow->count - start;
    for (i = start; i < count; i++) {
        gint unsorted = e_sorter_sorted_to_model (E_SORTER (reflow->sorter), i);
        if (i != 0 && running_height + reflow->heights[unsorted] + E_REFLOW_BORDER_WIDTH > reflow->height) {
            list = g_slist_prepend (list, GINT_TO_POINTER (i));
            column_count++;
            running_height = E_REFLOW_BORDER_WIDTH * 2 + reflow->heights[unsorted];
        } else
            running_height += reflow->heights[unsorted] + E_REFLOW_BORDER_WIDTH;
    }

    reflow->column_count = column_count;
    reflow->columns = g_renew (int, reflow->columns, column_count);
    column_count--;

    for (; list && column_count > column_start; column_count--) {
        GSList *to_free;
        reflow->columns[column_count] = GPOINTER_TO_INT (list->data);
        to_free = list;
        list = list->next;
        g_slist_free_1 (to_free);
    }
    reflow->columns[column_start] = start;

    queue_incarnate (reflow);

    reflow->need_reflow_columns = FALSE;
    reflow->reflow_from_column = -1;
}

static void
item_changed (EReflowModel *model,
              gint i,
              EReflow *reflow)
{
    if (i < 0 || i >= reflow->count)
        return;

    reflow->heights[i] = e_reflow_model_height (reflow->model, i, GNOME_CANVAS_GROUP (reflow));
    if (reflow->items[i] != NULL)
        e_reflow_model_reincarnate (model, i, reflow->items[i]);
    e_sorter_array_clean (reflow->sorter);
    reflow->reflow_from_column = -1;
    reflow->need_reflow_columns = TRUE;
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (reflow));
}

static void
item_removed (EReflowModel *model,
              gint i,
              EReflow *reflow)
{
    gint c;
    gint sorted;

    if (i < 0 || i >= reflow->count)
        return;

    sorted = e_sorter_model_to_sorted (E_SORTER (reflow->sorter), i);
    for (c = reflow->column_count - 1; c >= 0; c--) {
        gint start_of_column = reflow->columns[c];

        if (start_of_column <= sorted) {
            if (reflow->reflow_from_column == -1
                || reflow->reflow_from_column > c) {
                reflow->reflow_from_column = c;
            }
            break;
        }
    }

    if (reflow->items[i])
        g_object_run_dispose (G_OBJECT (reflow->items[i]));

    memmove (reflow->heights + i, reflow->heights + i + 1, (reflow->count - i - 1) * sizeof (gint));
    memmove (reflow->items + i, reflow->items + i + 1, (reflow->count - i - 1) * sizeof (GnomeCanvasItem *));

    reflow->count--;

    reflow->heights[reflow->count] = 0;
    reflow->items[reflow->count] = NULL;

    reflow->need_reflow_columns = TRUE;
    set_empty (reflow);
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (reflow));

    e_sorter_array_set_count (reflow->sorter, reflow->count);

    e_selection_model_simple_delete_rows (E_SELECTION_MODEL_SIMPLE (reflow->selection), i, 1);
}

static void
items_inserted (EReflowModel *model,
                gint position,
                gint count,
                EReflow *reflow)
{
    gint i, oldcount;

    if (position < 0 || position > reflow->count)
        return;

    oldcount = reflow->count;

    reflow->count += count;

    if (reflow->count > reflow->allocated_count) {
        while (reflow->count > reflow->allocated_count)
            reflow->allocated_count += 256;
        reflow->heights = g_renew (int, reflow->heights, reflow->allocated_count);
        reflow->items = g_renew (GnomeCanvasItem *, reflow->items, reflow->allocated_count);
    }
    memmove (reflow->heights + position + count, reflow->heights + position, (reflow->count - position - count) * sizeof (gint));
    memmove (reflow->items + position + count, reflow->items + position, (reflow->count - position - count) * sizeof (GnomeCanvasItem *));
    for (i = position; i < position + count; i++) {
        reflow->items[i] = NULL;
        reflow->heights[i] = e_reflow_model_height (reflow->model, i, GNOME_CANVAS_GROUP (reflow));
    }

    e_selection_model_simple_set_row_count (E_SELECTION_MODEL_SIMPLE (reflow->selection), reflow->count);
    if (position == oldcount)
        e_sorter_array_append (reflow->sorter, count);
    else
        e_sorter_array_set_count (reflow->sorter, reflow->count);

    for (i = position; i < position + count; i++) {
        gint sorted = e_sorter_model_to_sorted (E_SORTER (reflow->sorter), i);
        gint c;

        for (c = reflow->column_count - 1; c >= 0; c--) {
            gint start_of_column = reflow->columns[c];

            if (start_of_column <= sorted) {
                if (reflow->reflow_from_column == -1
                    || reflow->reflow_from_column > c) {
                    reflow->reflow_from_column = c;
                }
                break;
            }
        }
    }

    reflow->need_reflow_columns = TRUE;
    set_empty (reflow);
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (reflow));
}

static void
model_changed (EReflowModel *model,
               EReflow *reflow)
{
    gint i;
    gint count;
    gint oldcount;

    count = reflow->count;
    oldcount = count;

    for (i = 0; i < count; i++) {
        if (reflow->items[i])
            g_object_run_dispose (G_OBJECT (reflow->items[i]));
    }
    g_free (reflow->items);
    g_free (reflow->heights);
    reflow->count = e_reflow_model_count (model);
    reflow->allocated_count = reflow->count;
    reflow->items = g_new (GnomeCanvasItem *, reflow->count);
    reflow->heights = g_new (int, reflow->count);

    count = reflow->count;
    for (i = 0; i < count; i++) {
        reflow->items[i] = NULL;
        reflow->heights[i] = e_reflow_model_height (reflow->model, i, GNOME_CANVAS_GROUP (reflow));
    }

    e_selection_model_simple_set_row_count (E_SELECTION_MODEL_SIMPLE (reflow->selection), count);
    e_sorter_array_set_count (reflow->sorter, reflow->count);

    reflow->need_reflow_columns = TRUE;
    if (oldcount > reflow->count)
        reflow_columns (reflow);
    set_empty (reflow);
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (reflow));
}

static void
comparison_changed (EReflowModel *model,
                    EReflow *reflow)
{
    e_sorter_array_clean (reflow->sorter);
    reflow->reflow_from_column = -1;
    reflow->need_reflow_columns = TRUE;
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (reflow));
}

static void
set_empty (EReflow *reflow)
{
    if (reflow->count == 0) {
        if (reflow->empty_text) {
            if (reflow->empty_message) {
                gnome_canvas_item_set (
                    reflow->empty_text,
                    "width", reflow->minimum_width,
                    "text", reflow->empty_message,
                    NULL);
                e_canvas_item_move_absolute (
                    reflow->empty_text,
                    reflow->minimum_width / 2,
                    0);
            } else {
                g_object_run_dispose (G_OBJECT (reflow->empty_text));
                reflow->empty_text = NULL;
            }
        } else {
            if (reflow->empty_message) {
                reflow->empty_text = gnome_canvas_item_new (
                    GNOME_CANVAS_GROUP (reflow),
                    e_text_get_type (),
                    "width", reflow->minimum_width,
                    "clip", TRUE,
                    "use_ellipsis", TRUE,
                    "justification", GTK_JUSTIFY_CENTER,
                    "text", reflow->empty_message,
                    NULL);
                e_canvas_item_move_absolute (
                    reflow->empty_text,
                    reflow->minimum_width / 2,
                    0);
            }
        }
    } else {
        if (reflow->empty_text) {
            g_object_run_dispose (G_OBJECT (reflow->empty_text));
            reflow->empty_text = NULL;
        }
    }
}

static void
disconnect_model (EReflow *reflow)
{
    if (reflow->model == NULL)
        return;

    g_signal_handler_disconnect (
        reflow->model,
        reflow->model_changed_id);
    g_signal_handler_disconnect (
        reflow->model,
        reflow->comparison_changed_id);
    g_signal_handler_disconnect (
        reflow->model,
        reflow->model_items_inserted_id);
    g_signal_handler_disconnect (
        reflow->model,
        reflow->model_item_removed_id);
    g_signal_handler_disconnect (
        reflow->model,
        reflow->model_item_changed_id);
    g_object_unref (reflow->model);

    reflow->model_changed_id = 0;
    reflow->comparison_changed_id = 0;
    reflow->model_items_inserted_id = 0;
    reflow->model_item_removed_id = 0;
    reflow->model_item_changed_id = 0;
    reflow->model = NULL;
}

static void
disconnect_selection (EReflow *reflow)
{
    if (reflow->selection == NULL)
        return;

    g_signal_handler_disconnect (
        reflow->selection,
        reflow->selection_changed_id);
    g_signal_handler_disconnect (
        reflow->selection,
        reflow->selection_row_changed_id);
    g_signal_handler_disconnect (
        reflow->selection,
        reflow->cursor_changed_id);
    g_object_unref (reflow->selection);

    reflow->selection_changed_id = 0;
    reflow->selection_row_changed_id = 0;
    reflow->cursor_changed_id = 0;
    reflow->selection = NULL;
}

static void
connect_model (EReflow *reflow,
               EReflowModel *model)
{
    if (reflow->model != NULL)
        disconnect_model (reflow);

    if (model == NULL)
        return;

    reflow->model = g_object_ref (model);

    reflow->model_changed_id = g_signal_connect (
        reflow->model, "model_changed",
        G_CALLBACK (model_changed), reflow);

    reflow->comparison_changed_id = g_signal_connect (
        reflow->model, "comparison_changed",
        G_CALLBACK (comparison_changed), reflow);

    reflow->model_items_inserted_id = g_signal_connect (
        reflow->model, "model_items_inserted",
        G_CALLBACK (items_inserted), reflow);

    reflow->model_item_removed_id = g_signal_connect (
        reflow->model, "model_item_removed",
        G_CALLBACK (item_removed), reflow);

    reflow->model_item_changed_id = g_signal_connect (
        reflow->model, "model_item_changed",
        G_CALLBACK (item_changed), reflow);

    model_changed (model, reflow);
}

static void
adjustment_changed (GtkAdjustment *adjustment,
                    EReflow *reflow)
{
    queue_incarnate (reflow);
}

static void
disconnect_adjustment (EReflow *reflow)
{
    if (reflow->adjustment == NULL)
        return;

    g_signal_handler_disconnect (
        reflow->adjustment,
        reflow->adjustment_changed_id);
    g_signal_handler_disconnect (
        reflow->adjustment,
        reflow->adjustment_value_changed_id);

    g_object_unref (reflow->adjustment);

    reflow->adjustment_changed_id = 0;
    reflow->adjustment_value_changed_id = 0;
    reflow->adjustment = NULL;
}

static void
connect_adjustment (EReflow *reflow,
                    GtkAdjustment *adjustment)
{
    if (reflow->adjustment != NULL)
        disconnect_adjustment (reflow);

    if (adjustment == NULL)
        return;

    reflow->adjustment = g_object_ref (adjustment);

    reflow->adjustment_changed_id = g_signal_connect (
        adjustment, "changed",
        G_CALLBACK (adjustment_changed), reflow);

    reflow->adjustment_value_changed_id = g_signal_connect (
        adjustment, "value_changed",
        G_CALLBACK (adjustment_changed), reflow);
}

#if 0
static void
set_scroll_adjustments (GtkLayout *layout,
                        GtkAdjustment *hadj,
                        GtkAdjustment *vadj,
                        EReflow *reflow)
{
    connect_adjustment (reflow, hadj);
}

static void
connect_set_adjustment (EReflow *reflow)
{
    reflow->set_scroll_adjustments_id = g_signal_connect (
        GNOME_CANVAS_ITEM (reflow)->canvas, "set_scroll_adjustments",
        G_CALLBACK (set_scroll_adjustments), reflow);
}
#endif

static void
disconnect_set_adjustment (EReflow *reflow)
{
    if (reflow->set_scroll_adjustments_id != 0) {
        g_signal_handler_disconnect (
            GNOME_CANVAS_ITEM (reflow)->canvas,
            reflow->set_scroll_adjustments_id);
        reflow->set_scroll_adjustments_id = 0;
    }
}

static void
column_width_changed (EReflow *reflow)
{
    g_signal_emit (reflow, signals[COLUMN_WIDTH_CHANGED], 0, reflow->column_width);
}

/* Virtual functions */
static void
e_reflow_set_property (GObject *object,
                       guint property_id,
                       const GValue *value,
                       GParamSpec *pspec)
{
    GnomeCanvasItem *item;
    EReflow *reflow;

    item = GNOME_CANVAS_ITEM (object);
    reflow = E_REFLOW (object);

    switch (property_id) {
    case PROP_HEIGHT:
        reflow->height = g_value_get_double (value);
        reflow->need_reflow_columns = TRUE;
        e_canvas_item_request_reflow (item);
        break;
    case PROP_MINIMUM_WIDTH:
        reflow->minimum_width = g_value_get_double (value);
        if (item->flags & GNOME_CANVAS_ITEM_REALIZED)
            set_empty (reflow);
        e_canvas_item_request_reflow (item);
        break;
    case PROP_EMPTY_MESSAGE:
        g_free (reflow->empty_message);
        reflow->empty_message = g_strdup (g_value_get_string (value));
        if (item->flags & GNOME_CANVAS_ITEM_REALIZED)
            set_empty (reflow);
        break;
    case PROP_MODEL:
        connect_model (reflow, (EReflowModel *) g_value_get_object (value));
        break;
    case PROP_COLUMN_WIDTH:
        if (reflow->column_width != g_value_get_double (value)) {
            GtkLayout *layout;
            GtkAdjustment *adjustment;
            gdouble old_width = reflow->column_width;
            gdouble step_increment;
            gdouble page_size;

            layout = GTK_LAYOUT (item->canvas);
            adjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (layout));
            page_size = gtk_adjustment_get_page_size (adjustment);

            reflow->column_width = g_value_get_double (value);
            step_increment = (reflow->column_width +
                E_REFLOW_FULL_GUTTER) / 2;
            gtk_adjustment_set_step_increment (
                adjustment, step_increment);
            gtk_adjustment_set_page_increment (
                adjustment, page_size - step_increment);
            e_reflow_resize_children (item);
            e_canvas_item_request_reflow (item);

            reflow->need_column_resize = TRUE;
            gnome_canvas_item_request_update (item);

            if (old_width != reflow->column_width)
                column_width_changed (reflow);
        }
        break;
    }
}

static void
e_reflow_get_property (GObject *object,
                       guint property_id,
                       GValue *value,
                       GParamSpec *pspec)
{
    EReflow *reflow;

    reflow = E_REFLOW (object);

    switch (property_id) {
    case PROP_MINIMUM_WIDTH:
        g_value_set_double (value, reflow->minimum_width);
        break;
    case PROP_WIDTH:
        g_value_set_double (value, reflow->width);
        break;
    case PROP_HEIGHT:
        g_value_set_double (value, reflow->height);
        break;
    case PROP_EMPTY_MESSAGE:
        g_value_set_string (value, reflow->empty_message);
        break;
    case PROP_MODEL:
        g_value_set_object (value, reflow->model);
        break;
    case PROP_COLUMN_WIDTH:
        g_value_set_double (value, reflow->column_width);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
        break;
    }
}

static void
e_reflow_dispose (GObject *object)
{
    EReflow *reflow = E_REFLOW (object);

    g_free (reflow->items);
    g_free (reflow->heights);
    g_free (reflow->columns);

    reflow->items = NULL;
    reflow->heights = NULL;
    reflow->columns = NULL;
    reflow->count = 0;
    reflow->allocated_count = 0;

    if (reflow->incarnate_idle_id)
        g_source_remove (reflow->incarnate_idle_id);
    reflow->incarnate_idle_id = 0;

    if (reflow->do_adjustment_idle_id)
        g_source_remove (reflow->do_adjustment_idle_id);
    reflow->do_adjustment_idle_id = 0;

    disconnect_model (reflow);
    disconnect_selection (reflow);

    g_free (reflow->empty_message);
    reflow->empty_message = NULL;

    if (reflow->sorter) {
        g_object_unref (reflow->sorter);
        reflow->sorter = NULL;
    }

    G_OBJECT_CLASS (e_reflow_parent_class)->dispose (object);
}

static void
e_reflow_realize (GnomeCanvasItem *item)
{
    EReflow *reflow;
    GtkAdjustment *adjustment;
    gdouble page_increment;
    gdouble step_increment;
    gdouble page_size;
    gint count;
    gint i;

    reflow = E_REFLOW (item);

    if (GNOME_CANVAS_ITEM_CLASS (e_reflow_parent_class)->realize)
        (* GNOME_CANVAS_ITEM_CLASS (e_reflow_parent_class)->realize) (item);

    reflow->arrow_cursor = gdk_cursor_new (GDK_SB_H_DOUBLE_ARROW);
    reflow->default_cursor = gdk_cursor_new (GDK_LEFT_PTR);

    count = reflow->count;
    for (i = 0; i < count; i++) {
        if (reflow->items[i])
            gnome_canvas_item_set (
                reflow->items[i],
                "width", reflow->column_width,
                NULL);
    }

    set_empty (reflow);

    reflow->need_reflow_columns = TRUE;
    e_canvas_item_request_reflow (item);

    adjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (item->canvas));

#if 0
    connect_set_adjustment (reflow);
#endif
    connect_adjustment (reflow, adjustment);

    page_size = gtk_adjustment_get_page_size (adjustment);
    step_increment = (reflow->column_width + E_REFLOW_FULL_GUTTER) / 2;
    page_increment = page_size - step_increment;
    gtk_adjustment_set_step_increment (adjustment, step_increment);
    gtk_adjustment_set_page_increment (adjustment, page_increment);
}

static void
e_reflow_unrealize (GnomeCanvasItem *item)
{
    EReflow *reflow;

    reflow = E_REFLOW (item);

    g_object_unref (reflow->arrow_cursor);
    g_object_unref (reflow->default_cursor);
    reflow->arrow_cursor = NULL;
    reflow->default_cursor = NULL;

    g_free (reflow->columns);
    reflow->columns = NULL;

    disconnect_set_adjustment (reflow);
    disconnect_adjustment (reflow);

    if (GNOME_CANVAS_ITEM_CLASS (e_reflow_parent_class)->unrealize)
        (* GNOME_CANVAS_ITEM_CLASS (e_reflow_parent_class)->unrealize) (item);
}

static gboolean
e_reflow_event (GnomeCanvasItem *item,
                GdkEvent *event)
{
    EReflow *reflow;
    gint return_val = FALSE;

    reflow = E_REFLOW (item);

    switch (event->type)
        {
        case GDK_KEY_PRESS:
            return_val = e_selection_model_key_press (reflow->selection, (GdkEventKey *) event);
            break;
#if 0
            if (event->key.keyval == GDK_Tab ||
                event->key.keyval == GDK_KEY_KP_Tab ||
                event->key.keyval == GDK_ISO_Left_Tab) {
                gint i;
                gint count;
                count = reflow->count;
                for (i = 0; i < count; i++) {
                    gint unsorted = e_sorter_sorted_to_model (E_SORTER (reflow->sorter), i);
                    GnomeCanvasItem *item = reflow->items[unsorted];
                    EFocus has_focus;
                    if (item) {
                        g_object_get (
                            item,
                            "has_focus", &has_focus,
                            NULL);
                        if (has_focus) {
                            if (event->key.state & GDK_SHIFT_MASK) {
                                if (i == 0)
                                    return FALSE;
                                i--;
                            } else {
                                if (i == count - 1)
                                    return FALSE;
                                i++;
                            }

                            unsorted = e_sorter_sorted_to_model (E_SORTER (reflow->sorter), i);
                            if (reflow->items[unsorted] == NULL) {
                                reflow->items[unsorted] = e_reflow_model_incarnate (reflow->model, unsorted, GNOME_CANVAS_GROUP (reflow));
                            }

                            item = reflow->items[unsorted];
                            gnome_canvas_item_set (
                                item,
                                "has_focus", (event->key.state & GDK_SHIFT_MASK) ? E_FOCUS_END : E_FOCUS_START,
                                NULL);
                            return TRUE;
                        }
                    }
                }
            }
#endif
        case GDK_BUTTON_PRESS:
            switch (event->button.button)
                {
                case 1:
                    {
                        GdkEventButton *button = (GdkEventButton *) event;
                        gdouble n_x;
                        n_x = button->x;
                        n_x += E_REFLOW_BORDER_WIDTH + E_REFLOW_DIVIDER_WIDTH;
                        n_x = fmod (n_x,(reflow->column_width + E_REFLOW_FULL_GUTTER));

                        if (button->y >= E_REFLOW_BORDER_WIDTH && button->y <= reflow->height - E_REFLOW_BORDER_WIDTH && n_x < E_REFLOW_FULL_GUTTER) {
                            /* don't allow to drag the first line*/
                            if (e_reflow_pick_line (reflow, button->x) == 0)
                                return TRUE;
                            reflow->which_column_dragged = e_reflow_pick_line (reflow, button->x);
                            reflow->start_x = reflow->which_column_dragged * (reflow->column_width + E_REFLOW_FULL_GUTTER) - E_REFLOW_DIVIDER_WIDTH / 2;
                            reflow->temp_column_width = reflow->column_width;
                            reflow->column_drag = TRUE;

                            gnome_canvas_item_grab (
                                item,
                                GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK,
                                reflow->arrow_cursor,
                                button->device,
                                button->time);

                            reflow->previous_temp_column_width = -1;
                            reflow->need_column_resize = TRUE;
                            gnome_canvas_item_request_update (item);
                            return TRUE;
                        }
                    }
                    break;
                case 4:
                    {
                        GtkLayout *layout;
                        GtkAdjustment *adjustment;
                        gdouble new_value;

                        layout = GTK_LAYOUT (item->canvas);
                        adjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (layout));
                        new_value = gtk_adjustment_get_value (adjustment);
                        new_value -= gtk_adjustment_get_step_increment (adjustment);
                        gtk_adjustment_set_value (adjustment, new_value);
                    }
                    break;
                case 5:
                    {
                        GtkLayout *layout;
                        GtkAdjustment *adjustment;
                        gdouble new_value;
                        gdouble page_size;
                        gdouble upper;

                        layout = GTK_LAYOUT (item->canvas);
                        adjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (layout));
                        new_value = gtk_adjustment_get_value (adjustment);
                        new_value += gtk_adjustment_get_step_increment (adjustment);
                        upper = gtk_adjustment_get_upper (adjustment);
                        page_size = gtk_adjustment_get_page_size (adjustment);
                        if (new_value > upper - page_size)
                            new_value = upper - page_size;
                        gtk_adjustment_set_value (adjustment, new_value);
                    }
                    break;
                }
            break;
        case GDK_BUTTON_RELEASE:
            if (reflow->column_drag) {
                gdouble old_width = reflow->column_width;
                GdkEventButton *button = (GdkEventButton *) event;
                GtkAdjustment *adjustment;
                GtkLayout *layout;
                gdouble value;

                layout = GTK_LAYOUT (item->canvas);
                adjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (layout));
                value = gtk_adjustment_get_value (adjustment);

                reflow->temp_column_width = reflow->column_width +
                    (button->x - reflow->start_x) / (reflow->which_column_dragged - e_reflow_pick_line (reflow, value));
                if (reflow->temp_column_width < 50)
                    reflow->temp_column_width = 50;
                reflow->column_drag = FALSE;
                if (old_width != reflow->temp_column_width) {
                    gdouble page_increment;
                    gdouble step_increment;
                    gdouble page_size;

                    page_size = gtk_adjustment_get_page_size (adjustment);
                    gtk_adjustment_set_value (adjustment, value + e_reflow_pick_line (reflow, value) * (reflow->temp_column_width - reflow->column_width));
                    reflow->column_width = reflow->temp_column_width;
                    step_increment = (reflow->column_width + E_REFLOW_FULL_GUTTER) / 2;
                    page_increment = page_size - step_increment;
                    gtk_adjustment_set_step_increment (adjustment, step_increment);
                    gtk_adjustment_set_page_increment (adjustment, page_increment);
                    e_reflow_resize_children (item);
                    e_canvas_item_request_reflow (item);
                    gnome_canvas_request_redraw (item->canvas, 0, 0, reflow->width, reflow->height);
                    column_width_changed (reflow);
                }
                reflow->need_column_resize = TRUE;
                gnome_canvas_item_request_update (item);
                gnome_canvas_item_ungrab (item, button->time);
                return TRUE;
            }
            break;
        case GDK_MOTION_NOTIFY:
            if (reflow->column_drag) {
                gdouble old_width = reflow->temp_column_width;
                GdkEventMotion *motion = (GdkEventMotion *) event;
                GtkAdjustment *adjustment;
                GtkLayout *layout;
                gdouble value;

                layout = GTK_LAYOUT (item->canvas);
                adjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (layout));
                value = gtk_adjustment_get_value (adjustment);

                reflow->temp_column_width = reflow->column_width +
                    (motion->x - reflow->start_x) / (reflow->which_column_dragged - e_reflow_pick_line (reflow, value));
                if (reflow->temp_column_width < 50)
                    reflow->temp_column_width = 50;
                if (old_width != reflow->temp_column_width) {
                    reflow->need_column_resize = TRUE;
                    gnome_canvas_item_request_update (item);
                }
                return TRUE;
            } else {
                GdkEventMotion *motion = (GdkEventMotion *) event;
                GdkWindow *window;
                gdouble n_x;

                n_x = motion->x;
                n_x += E_REFLOW_BORDER_WIDTH + E_REFLOW_DIVIDER_WIDTH;
                n_x = fmod (n_x,(reflow->column_width + E_REFLOW_FULL_GUTTER));

                window = gtk_widget_get_window (GTK_WIDGET (item->canvas));

                if (motion->y >= E_REFLOW_BORDER_WIDTH && motion->y <= reflow->height - E_REFLOW_BORDER_WIDTH && n_x < E_REFLOW_FULL_GUTTER) {
                    if (reflow->default_cursor_shown) {
                        gdk_window_set_cursor (window, reflow->arrow_cursor);
                        reflow->default_cursor_shown = FALSE;
                    }
                } else
                    if (!reflow->default_cursor_shown) {
                        gdk_window_set_cursor (window, reflow->default_cursor);
                        reflow->default_cursor_shown = TRUE;
                    }

            }
            break;
        case GDK_ENTER_NOTIFY:
            if (!reflow->column_drag) {
                GdkEventCrossing *crossing = (GdkEventCrossing *) event;
                GdkWindow *window;
                gdouble n_x;

                n_x = crossing->x;
                n_x += E_REFLOW_BORDER_WIDTH + E_REFLOW_DIVIDER_WIDTH;
                n_x = fmod (n_x,(reflow->column_width + E_REFLOW_FULL_GUTTER));

                window = gtk_widget_get_window (GTK_WIDGET (item->canvas));

                if (crossing->y >= E_REFLOW_BORDER_WIDTH && crossing->y <= reflow->height - E_REFLOW_BORDER_WIDTH && n_x < E_REFLOW_FULL_GUTTER) {
                    if (reflow->default_cursor_shown) {
                        gdk_window_set_cursor (window, reflow->arrow_cursor);
                        reflow->default_cursor_shown = FALSE;
                    }
                }
            }
            break;
        case GDK_LEAVE_NOTIFY:
            if (!reflow->column_drag) {
                GdkEventCrossing *crossing = (GdkEventCrossing *) event;
                GdkWindow *window;
                gdouble n_x;

                n_x = crossing->x;
                n_x += E_REFLOW_BORDER_WIDTH + E_REFLOW_DIVIDER_WIDTH;
                n_x = fmod (n_x,(reflow->column_width + E_REFLOW_FULL_GUTTER));

                window = gtk_widget_get_window (GTK_WIDGET (item->canvas));

                if (!(crossing->y >= E_REFLOW_BORDER_WIDTH && crossing->y <= reflow->height - E_REFLOW_BORDER_WIDTH && n_x < E_REFLOW_FULL_GUTTER)) {
                    if (!reflow->default_cursor_shown) {
                        gdk_window_set_cursor (window, reflow->default_cursor);
                        reflow->default_cursor_shown = TRUE;
                    }
                }
            }
            break;
        default:
            break;
        }
    if (return_val)
        return return_val;
    else if (GNOME_CANVAS_ITEM_CLASS (e_reflow_parent_class)->event)
        return (* GNOME_CANVAS_ITEM_CLASS (e_reflow_parent_class)->event) (item, event);
    else
        return FALSE;
}

static void
e_reflow_draw (GnomeCanvasItem *item,
               cairo_t *cr,
               gint x,
               gint y,
               gint width,
               gint height)
{
    GtkStyleContext *style_context;
    GtkWidget *widget;
    gint x_rect, y_rect, width_rect, height_rect;
    gdouble running_width;
    EReflow *reflow = E_REFLOW (item);
    GdkRGBA color;
    gint i;
    gdouble column_width;

    if (GNOME_CANVAS_ITEM_CLASS (e_reflow_parent_class)->draw)
        GNOME_CANVAS_ITEM_CLASS (e_reflow_parent_class)->draw (item, cr, x, y, width, height);
    column_width = reflow->column_width;
    running_width = E_REFLOW_BORDER_WIDTH + column_width + E_REFLOW_BORDER_WIDTH;
    y_rect = E_REFLOW_BORDER_WIDTH;
    width_rect = E_REFLOW_DIVIDER_WIDTH;
    height_rect = reflow->height - (E_REFLOW_BORDER_WIDTH * 2);

    /* Compute first column to draw. */
    i = x;
    i /= column_width + E_REFLOW_FULL_GUTTER;
    running_width += i * (column_width + E_REFLOW_FULL_GUTTER);

    widget = GTK_WIDGET (item->canvas);
    style_context = gtk_widget_get_style_context (widget);

    cairo_save (cr);

    gtk_style_context_get_background_color (
        style_context, GTK_STATE_FLAG_ACTIVE, &color);
    gdk_cairo_set_source_rgba (cr, &color);

    for (; i < reflow->column_count; i++) {
        if (running_width > x + width)
            break;
        x_rect = running_width;

        gtk_render_background (
            style_context, cr,
            (gdouble) x_rect - x,
            (gdouble) y_rect - y,
            (gdouble) width_rect,
            (gdouble) height_rect);

        running_width += E_REFLOW_DIVIDER_WIDTH + E_REFLOW_BORDER_WIDTH + column_width + E_REFLOW_BORDER_WIDTH;
    }

    cairo_restore (cr);

    if (reflow->column_drag) {
        GtkAdjustment *adjustment;
        GtkLayout *layout;
        gdouble value;
        gint start_line;

        layout = GTK_LAYOUT (item->canvas);
        adjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (layout));
        value = gtk_adjustment_get_value (adjustment);

        start_line = e_reflow_pick_line (reflow, value);
        i = x - start_line * (column_width + E_REFLOW_FULL_GUTTER);
        running_width = start_line * (column_width + E_REFLOW_FULL_GUTTER);
        column_width = reflow->temp_column_width;
        running_width -= start_line * (column_width + E_REFLOW_FULL_GUTTER);
        i += start_line * (column_width + E_REFLOW_FULL_GUTTER);
        running_width += E_REFLOW_BORDER_WIDTH + column_width + E_REFLOW_BORDER_WIDTH;
        y_rect = E_REFLOW_BORDER_WIDTH;
        width_rect = E_REFLOW_DIVIDER_WIDTH;
        height_rect = reflow->height - (E_REFLOW_BORDER_WIDTH * 2);

        /* Compute first column to draw. */
        i /= column_width + E_REFLOW_FULL_GUTTER;
        running_width += i * (column_width + E_REFLOW_FULL_GUTTER);

        cairo_save (cr);

        gtk_style_context_get_color (
            style_context, GTK_STATE_FLAG_NORMAL, &color);
        gdk_cairo_set_source_rgba (cr, &color);

        for (; i < reflow->column_count; i++) {
            if (running_width > x + width)
                break;
            x_rect = running_width;
            cairo_rectangle (
                cr,
                x_rect - x,
                y_rect - y,
                width_rect - 1,
                height_rect - 1);
            cairo_fill (cr);
            running_width += E_REFLOW_DIVIDER_WIDTH + E_REFLOW_BORDER_WIDTH + column_width + E_REFLOW_BORDER_WIDTH;
        }

        cairo_restore (cr);
    }
}

static void
e_reflow_update (GnomeCanvasItem *item,
                 const cairo_matrix_t *i2c,
                 gint flags)
{
    EReflow *reflow;
    gdouble x0, x1, y0, y1;

    reflow = E_REFLOW (item);

    if (GNOME_CANVAS_ITEM_CLASS (e_reflow_parent_class)->update)
        GNOME_CANVAS_ITEM_CLASS (e_reflow_parent_class)->update (item, i2c, flags);

    x0 = item->x1;
    y0 = item->y1;
    x1 = item->x2;
    y1 = item->y2;
    if (x1 < x0 + reflow->width)
        x1 = x0 + reflow->width;
    if (y1 < y0 + reflow->height)
        y1 = y0 + reflow->height;
    item->x2 = x1;
    item->y2 = y1;

    if (reflow->need_height_update) {
        x0 = item->x1;
        y0 = item->y1;
        x1 = item->x2;
        y1 = item->y2;
        if (x0 > 0)
            x0 = 0;
        if (y0 > 0)
            y0 = 0;
        if (x1 < E_REFLOW (item)->width)
            x1 = E_REFLOW (item)->width;
        if (x1 < E_REFLOW (item)->height)
            x1 = E_REFLOW (item)->height;

        gnome_canvas_request_redraw (item->canvas, x0, y0, x1, y1);
        reflow->need_height_update = FALSE;
    } else if (reflow->need_column_resize) {
        GtkLayout *layout;
        GtkAdjustment *adjustment;
        gint x_rect, y_rect, width_rect, height_rect;
        gint start_line;
        gdouble running_width;
        gint i;
        gdouble column_width;
        gdouble value;

        layout = GTK_LAYOUT (item->canvas);
        adjustment = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (layout));
        value = gtk_adjustment_get_value (adjustment);
        start_line = e_reflow_pick_line (reflow, value);

        if (reflow->previous_temp_column_width != -1) {
            running_width = start_line * (reflow->column_width + E_REFLOW_FULL_GUTTER);
            column_width = reflow->previous_temp_column_width;
            running_width -= start_line * (column_width + E_REFLOW_FULL_GUTTER);
            running_width += E_REFLOW_BORDER_WIDTH + column_width + E_REFLOW_BORDER_WIDTH;
            y_rect = E_REFLOW_BORDER_WIDTH;
            width_rect = E_REFLOW_DIVIDER_WIDTH;
            height_rect = reflow->height - (E_REFLOW_BORDER_WIDTH * 2);

            for (i = 0; i < reflow->column_count; i++) {
                x_rect = running_width;
                gnome_canvas_request_redraw (item->canvas, x_rect, y_rect, x_rect + width_rect, y_rect + height_rect);
                running_width += E_REFLOW_DIVIDER_WIDTH + E_REFLOW_BORDER_WIDTH + column_width + E_REFLOW_BORDER_WIDTH;
            }
        }

        if (reflow->temp_column_width != -1) {
            running_width = start_line * (reflow->column_width + E_REFLOW_FULL_GUTTER);
            column_width = reflow->temp_column_width;
            running_width -= start_line * (column_width + E_REFLOW_FULL_GUTTER);
            running_width += E_REFLOW_BORDER_WIDTH + column_width + E_REFLOW_BORDER_WIDTH;
            y_rect = E_REFLOW_BORDER_WIDTH;
            width_rect = E_REFLOW_DIVIDER_WIDTH;
            height_rect = reflow->height - (E_REFLOW_BORDER_WIDTH * 2);

            for (i = 0; i < reflow->column_count; i++) {
                x_rect = running_width;
                gnome_canvas_request_redraw (item->canvas, x_rect, y_rect, x_rect + width_rect, y_rect + height_rect);
                running_width += E_REFLOW_DIVIDER_WIDTH + E_REFLOW_BORDER_WIDTH + column_width + E_REFLOW_BORDER_WIDTH;
            }
        }

        reflow->previous_temp_column_width = reflow->temp_column_width;
        reflow->need_column_resize = FALSE;
    }
}

static GnomeCanvasItem *
e_reflow_point (GnomeCanvasItem *item,
                gdouble x,
                gdouble y,
                gint cx,
                gint cy)
{
    GnomeCanvasItem *child = NULL;

    if (GNOME_CANVAS_ITEM_CLASS (e_reflow_parent_class)->point)
        child = GNOME_CANVAS_ITEM_CLASS (e_reflow_parent_class)->point (item, x, y, cx, cy);

    return child ? child : item;
#if 0
    if (y >= E_REFLOW_BORDER_WIDTH && y <= reflow->height - E_REFLOW_BORDER_WIDTH) {
        gfloat n_x;
        n_x = x;
        n_x += E_REFLOW_BORDER_WIDTH + E_REFLOW_DIVIDER_WIDTH;
        n_x = fmod (n_x, (reflow->column_width + E_REFLOW_FULL_GUTTER));
        if (n_x < E_REFLOW_FULL_GUTTER) {
            *actual_item = item;
            return 0;
        }
    }
    return distance;
#endif
}

static void
e_reflow_reflow (GnomeCanvasItem *item,
                 gint flags)
{
    EReflow *reflow = E_REFLOW (item);
    gdouble old_width;
    gdouble running_width;
    gdouble running_height;
    gint next_column;
    gint i;

    if (!(item->flags & GNOME_CANVAS_ITEM_REALIZED))
        return;

    if (reflow->need_reflow_columns) {
        reflow_columns (reflow);
    }

    old_width = reflow->width;

    running_width = E_REFLOW_BORDER_WIDTH;
    running_height = E_REFLOW_BORDER_WIDTH;

    next_column = 1;

    for (i = 0; i < reflow->count; i++) {
        gint unsorted = e_sorter_sorted_to_model (E_SORTER (reflow->sorter), i);
        if (next_column < reflow->column_count && i == reflow->columns[next_column]) {
            running_height = E_REFLOW_BORDER_WIDTH;
            running_width += reflow->column_width + E_REFLOW_FULL_GUTTER;
            next_column++;
        }

        if (unsorted >= 0 && reflow->items[unsorted]) {
            e_canvas_item_move_absolute (
                GNOME_CANVAS_ITEM (reflow->items[unsorted]),
                (gdouble) running_width,
                (gdouble) running_height);
            running_height += reflow->heights[unsorted] + E_REFLOW_BORDER_WIDTH;
        }
    }
    reflow->width = running_width + reflow->column_width + E_REFLOW_BORDER_WIDTH;
    if (reflow->width < reflow->minimum_width)
        reflow->width = reflow->minimum_width;
    if (old_width != reflow->width)
        e_canvas_item_request_parent_reflow (item);
}

static gint
e_reflow_selection_event_real (EReflow *reflow,
                               GnomeCanvasItem *item,
                               GdkEvent *event)
{
    gint row;
    gint return_val = TRUE;
    switch (event->type) {
    case GDK_BUTTON_PRESS:
        switch (event->button.button) {
        case 1: /* Fall through. */
        case 2:
            row = er_find_item (reflow, item);
            if (event->button.button == 1) {
                reflow->maybe_did_something =
                    e_selection_model_maybe_do_something (reflow->selection, row, 0, event->button.state);
                reflow->maybe_in_drag = TRUE;
            } else {
                e_selection_model_do_something (reflow->selection, row, 0, event->button.state);
            }
            break;
        case 3:
            row = er_find_item (reflow, item);
            e_selection_model_right_click_down (reflow->selection, row, 0, 0);
            break;
        default:
            return_val = FALSE;
            break;
        }
        break;
    case GDK_BUTTON_RELEASE:
        if (event->button.button == 1) {
            if (reflow->maybe_in_drag) {
                reflow->maybe_in_drag = FALSE;
                if (!reflow->maybe_did_something) {
                    row = er_find_item (reflow, item);
                    e_selection_model_do_something (reflow->selection, row, 0, event->button.state);
                }
            }
        }
        break;
    case GDK_KEY_PRESS:
        return_val = e_selection_model_key_press (reflow->selection, (GdkEventKey *) event);
        break;
    default:
        return_val = FALSE;
        break;
    }

    return return_val;
}

static void
e_reflow_class_init (EReflowClass *class)
{
    GObjectClass *object_class;
    GnomeCanvasItemClass *item_class;

    object_class = (GObjectClass *) class;
    item_class = (GnomeCanvasItemClass *) class;

    object_class->set_property = e_reflow_set_property;
    object_class->get_property = e_reflow_get_property;
    object_class->dispose = e_reflow_dispose;

    /* GnomeCanvasItem method overrides */
    item_class->event = e_reflow_event;
    item_class->realize = e_reflow_realize;
    item_class->unrealize = e_reflow_unrealize;
    item_class->draw = e_reflow_draw;
    item_class->update = e_reflow_update;
    item_class->point = e_reflow_point;

    class->selection_event = e_reflow_selection_event_real;
    class->column_width_changed = NULL;

    g_object_class_install_property (
        object_class,
        PROP_MINIMUM_WIDTH,
        g_param_spec_double (
            "minimum_width",
            "Minimum width",
            "Minimum Width",
            0.0, G_MAXDOUBLE, 0.0,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_WIDTH,
        g_param_spec_double (
            "width",
            "Width",
            "Width",
            0.0, G_MAXDOUBLE, 0.0,
            G_PARAM_READABLE));

    g_object_class_install_property (
        object_class,
        PROP_HEIGHT,
        g_param_spec_double (
            "height",
            "Height",
            "Height",
            0.0, G_MAXDOUBLE, 0.0,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_EMPTY_MESSAGE,
        g_param_spec_string (
            "empty_message",
            "Empty message",
            "Empty message",
            NULL,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_MODEL,
        g_param_spec_object (
            "model",
            "Reflow model",
            "Reflow model",
            E_TYPE_REFLOW_MODEL,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_COLUMN_WIDTH,
        g_param_spec_double (
            "column_width",
            "Column width",
            "Column width",
            0.0, G_MAXDOUBLE, 150.0,
            G_PARAM_READWRITE));

    signals[SELECTION_EVENT] = g_signal_new (
        "selection_event",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (EReflowClass, selection_event),
        NULL, NULL,
        e_marshal_INT__OBJECT_BOXED,
        G_TYPE_INT, 2,
        G_TYPE_OBJECT,
        GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE);

    signals[COLUMN_WIDTH_CHANGED] = g_signal_new (
        "column_width_changed",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (EReflowClass, column_width_changed),
        NULL, NULL,
        g_cclosure_marshal_VOID__DOUBLE,
        G_TYPE_NONE, 1,
        G_TYPE_DOUBLE);
}

static void
e_reflow_init (EReflow *reflow)
{
    reflow->model = NULL;
    reflow->items = NULL;
    reflow->heights = NULL;
    reflow->count = 0;

    reflow->columns = NULL;
    reflow->column_count = 0;

    reflow->empty_text = NULL;
    reflow->empty_message = NULL;

    reflow->minimum_width = 10;
    reflow->width = 10;
    reflow->height = 10;

    reflow->column_width = 150;

    reflow->column_drag = FALSE;

    reflow->need_height_update = FALSE;
    reflow->need_column_resize = FALSE;
    reflow->need_reflow_columns = FALSE;

    reflow->maybe_did_something = FALSE;
    reflow->maybe_in_drag = FALSE;

    reflow->default_cursor_shown = TRUE;
    reflow->arrow_cursor = NULL;
    reflow->default_cursor = NULL;

    reflow->cursor_row = -1;

    reflow->incarnate_idle_id = 0;
    reflow->do_adjustment_idle_id = 0;
    reflow->set_scroll_adjustments_id = 0;

    reflow->selection = E_SELECTION_MODEL (e_selection_model_simple_new ());
    reflow->sorter = e_sorter_array_new (er_create_cmp_cache, er_compare, reflow);

    g_object_set (
        reflow->selection,
        "sorter", reflow->sorter,
        NULL);

    reflow->selection_changed_id = g_signal_connect (
        reflow->selection, "selection_changed",
        G_CALLBACK (selection_changed), reflow);

    reflow->selection_row_changed_id = g_signal_connect (
        reflow->selection, "selection_row_changed",
        G_CALLBACK (selection_row_changed), reflow);

    reflow->cursor_changed_id = g_signal_connect (
        reflow->selection, "cursor_changed",
        G_CALLBACK (cursor_changed), reflow);

    e_canvas_item_set_reflow_callback (GNOME_CANVAS_ITEM (reflow), e_reflow_reflow);
}