path: root/widgets/e-table/e-table-group-container.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * E-Table-Group.c: Implements the grouping objects for elements on a table
 *
 * Author:
 *   Chris Lahey <clahey@helixcode.com>
 *   Miguel de Icaza (miguel@gnu.org)
 *
 * Copyright 1999, 2000 Helix Code, Inc.
 */

#include <config.h>
#include <gtk/gtksignal.h>
#include "e-table-group-container.h"
#include "e-table-item.h"
#include <libgnomeui/gnome-canvas-rect-ellipse.h>
#include "e-util/e-util.h"
#include "e-util/e-canvas.h"
#include "e-util/e-canvas-utils.h"
#include "widgets/e-text/e-text.h"

#define TITLE_HEIGHT         16
#define GROUP_INDENT         10

#define BUTTON_HEIGHT        10
#define BUTTON_PADDING       2

#define PARENT_TYPE e_table_group_get_type ()

static GnomeCanvasGroupClass *etgc_parent_class;

/* The arguments we take */
enum {
    ARG_0,
    ARG_HEIGHT,
    ARG_WIDTH,
    ARG_FROZEN
};

typedef struct {
    ETableGroup *child;
    void *key;
    GnomeCanvasItem *text;
    GnomeCanvasItem *rect;
    gint count;
} ETableGroupContainerChildNode;

static void
e_table_group_container_child_node_free (ETableGroupContainer          *etgc,
                    ETableGroupContainerChildNode *child_node)
{
    ETableGroup *etg = E_TABLE_GROUP (etgc);
    ETableGroup *child = child_node->child;

    gtk_object_destroy (GTK_OBJECT (child));
    e_table_model_free_value (etg->model, etgc->ecol->col_idx,
                  child_node->key);
    gtk_object_destroy (GTK_OBJECT (child_node->text));
    gtk_object_destroy (GTK_OBJECT (child_node->rect));
}

static void
e_table_group_container_list_free (ETableGroupContainer *etgc)
{
    ETableGroupContainerChildNode *child_node;
    GList *list;

    if (etgc->idle)
        g_source_remove (etgc->idle);

    for (list = etgc->children; list; list = g_list_next (list)) {
        child_node = (ETableGroupContainerChildNode *) list->data;
        e_table_group_container_child_node_free (etgc, child_node);
    }

    g_list_free (etgc->children);
}

static void
etgc_destroy (GtkObject *object)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER (object);

    if (etgc->font){
        gdk_font_unref (etgc->font);
        etgc->font = NULL;
    }
    if (etgc->ecol){
        gtk_object_unref (GTK_OBJECT(etgc->ecol));
    }
    if (etgc->sort_info){
        gtk_object_unref (GTK_OBJECT(etgc->sort_info));
    }
    if (etgc->rect){
        gtk_object_destroy (GTK_OBJECT(etgc->rect));
    }   
    e_table_group_container_list_free (etgc);

    GTK_OBJECT_CLASS (etgc_parent_class)->destroy (object);
}

#if 0
void
e_table_group_add (ETableGroup *etg, GnomeCanvasItem *item)
{
    double x1, y1, x2, y2;
    
    g_return_if_fail (etg != NULL);
    g_return_if_fail (item != NULL);
    g_return_if_fail (E_IS_TABLE_GROUP (etg));
    g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));

    etg->children = g_list_append (etg->children, item);

    GNOME_CANVAS_ITEM_CLASS (GTK_OBJECT (etg)->klass)->bounds (etg, &x1, &y1, &x2, &y2);
        
    if (GTK_OBJECT (etg)->flags & GNOME_CANVAS_ITEM_REALIZED){
        GList *l;
        int height = etg->transparent ? 0 : TITLE_HEIGHT;
        int x = etg->transparent ? 0 : GROUP_INDENT;
        
        for (l = etg->children; l->next; l = l->next){
            GnomeCanvasItem *child = l->data;

            height += child->y2 - child->y1;

            printf ("Height\n");
            if (E_IS_TABLE_ITEM (item)){
                printf ("    Item:  ");
            } else {
                printf ("    Group: ");
            }
            printf ("%d\n", child->y2-child->y1);
        }

        e_canvas_item_move_absolute (item, x, height);

        
        if (E_IS_TABLE_ITEM (item)){
            
            printf ("Table item! ---------\n");
            gtk_signal_connect (GTK_OBJECT (item), "resize",
                        GTK_SIGNAL_FUNC (etg_relayout), etg);
        }
    }
}

static void
etg_realize (GnomeCanvasItem *item)
{
    ETableGroup *etg = E_TABLE_GROUP (item);
    GList *l;
    int height = 0;
    
    GNOME_CANVAS_ITEM_CLASS (etg_parent_class)->realize (item);

    for (l = etg->children; l; l = l->next){
        GnomeCanvasItem *child = l->data;

        printf ("During realization for child %p -> %d\n", child, height);
        gnome_canvas_item_set (
            child,
            "y", (double) height,
            NULL);

        height += child->y2 - child->y1;
    }
}

static void
etg_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
    ETableGroup *etg = E_TABLE_GROUP (item);

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

    if (!etg->transparent){
        int current_width, current_height;

        etg_dim (etg, &current_width, &current_height);
        
        if ((current_height != etg->height) || (current_width != etg->width)){
            etg->width = current_width;
            etg->height = current_height;
            
            gnome_canvas_item_set (
                etg->rect,
                "x1", 0.0,
                "y1", 0.0,
                "x2", (double) etg->width,
                "y2", (double) etg->height,
                NULL);
        }
    }
}
#endif

void
e_table_group_container_construct (GnomeCanvasGroup *parent, ETableGroupContainer *etgc,
                   ETableHeader *full_header,
                   ETableHeader     *header,
                   ETableModel *model, ETableSortInfo *sort_info, int n)
{
    ETableCol *col;
    ETableSortColumn column = e_table_sort_info_grouping_get_nth(sort_info, n);

    if (column.column > e_table_header_count (full_header))
        col = e_table_header_get_columns (full_header)[e_table_header_count (full_header) - 1];
    else
        col = e_table_header_get_columns (full_header)[column.column];

    e_table_group_construct (parent, E_TABLE_GROUP (etgc), full_header, header, model);
    etgc->ecol = col;
    gtk_object_ref (GTK_OBJECT(etgc->ecol));
    etgc->sort_info = sort_info;
    gtk_object_ref (GTK_OBJECT(etgc->sort_info));
    etgc->n = n;
    etgc->ascending = column.ascending;

    
    etgc->font = gdk_font_load ("lucidasans-10");
    if (!etgc->font){
        etgc->font = GTK_WIDGET (GNOME_CANVAS_ITEM (etgc)->canvas)->style->font;
        
        gdk_font_ref (etgc->font);
    }
    etgc->open = TRUE;
#if 0
    etgc->transparent = transparent;
    
    etgc_dim (etgc, &etgc->width, &etgc->height);

    if (!etgc->transparent)
        etgc->rect = gnome_canvas_item_new (
            GNOME_CANVAS_GROUP (etgc),
            gnome_canvas_rect_get_type (),
            "fill_color", "gray",
            "outline_color", "gray20",
            "x1", 0.0,
            "y1", 0.0,
            "x2", (double) etgc->width,
            "y2", (double) etgc->height,
            NULL);
#endif

#if 0
    /*
     * Reparent the child into our space.
     */
    gnome_canvas_item_reparent (child, GNOME_CANVAS_GROUP (etgc));

    gnome_canvas_item_set (
        child,
        "x", (double) GROUP_INDENT,
        "y", (double) TITLE_HEIGHT,
        NULL);

    /*
     * Force dimension computation
     */
    GNOME_CANVAS_ITEM_CLASS (etgc_parent_class)->update (
        GNOME_CANVAS_ITEM (etgc), NULL, NULL, GNOME_CANVAS_UPDATE_REQUESTED);
#endif
}

ETableGroup *
e_table_group_container_new (GnomeCanvasGroup *parent, ETableHeader *full_header,
                 ETableHeader     *header,
                 ETableModel *model, ETableSortInfo *sort_info, int n)
{
    ETableGroupContainer *etgc;

    g_return_val_if_fail (parent != NULL, NULL);
    
    etgc = gtk_type_new (e_table_group_container_get_type ());

    e_table_group_container_construct (parent, etgc, full_header, header,
                       model, sort_info, n);
    return E_TABLE_GROUP (etgc);
}

#if 0
static void
etgc_relayout (GnomeCanvasItem *eti, ETableGroupContainer *etgc)
{
    GList *l;
    int height = etgc->transparent ? 0 : GROUP_INDENT;
    gboolean move = FALSE;
    
    printf ("Relaying out\n");
    
    for (l = etgc->children; l->next; l = l->next){
        GnomeCanvasItem *child = l->data;

        height += child->y2 - child->y1;

        if (child == eti)
            move = TRUE;

        if (move){
            printf ("Moving item %p\n", child);
            gnome_canvas_item_set (child,
                        "y", (double) height,
                        NULL);
        }
    }
    if (height != etgc->height){
        etgc->height = height;
        gtk_signal_emit (GTK_OBJECT (etgc), etgc_signals [RESIZE]);
    }
}

void
e_table_group_container_add (ETableGroupContainer *etgc, GnomeCanvasItem *item)
{
    double x1, y1, x2, y2;
    
    g_return_if_fail (etgc != NULL);
    g_return_if_fail (item != NULL);
    g_return_if_fail (E_IS_TABLE_GROUP (etgc));
    g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));

    etgc->children = g_list_append (etgc->children, item);

    GNOME_CANVAS_ITEM_CLASS (GTK_OBJECT (etgc)->klass)->bounds (etgc, &x1, &y1, &x2, &y2);
        
    if (GTK_OBJECT (etgc)->flags & GNOME_CANVAS_ITEM_REALIZED){
        GList *l;
        int height = etgc->transparent ? 0 : TITLE_HEIGHT;
        int x = etgc->transparent ? 0 : GROUP_INDENT;
        
        for (l = etgc->children; l->next; l = l->next){
            GnomeCanvasItem *child = l->data;

            height += child->y2 - child->y1;

            printf ("Height\n");
            if (E_IS_TABLE_ITEM (item)){
                printf ("    Item:  ");
            } else {
                printf ("    Group: ");
            }
            printf ("%d\n", child->y2-child->y1);
        }

        e_canvas_item_move_absolute (item, x, height);

        
        if (E_IS_TABLE_ITEM (item)){
            
            printf ("Table item! ---------\n");
            gtk_signal_connect (GTK_OBJECT (item), "resize",
                        GTK_SIGNAL_FUNC (etgc_relayout), etgc);
        }
    }
}

static void
etgc_realize (GnomeCanvasItem *item)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER (item);
    GList *l;
    int height = 0;
    
    GNOME_CANVAS_ITEM_CLASS (etgc_parent_class)->realize (item);

    for (l = etgc->children; l; l = l->next){
        GnomeCanvasItem *child = l->data;

        printf ("During realization for child %p -> %d\n", child, height);
        gnome_canvas_item_set (
            child,
            "y", (double) height,
            NULL);

        height += child->y2 - child->y1;
    }
}

static void
etgc_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER (item);

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

    if (etgc->need_resize) {
        
        if (!etgc->transparent) {
            int current_width, current_height;

            etgc_dim (etgc, &current_width, &current_height);
        
            if ((current_height != etgc->height) || (current_width != etgc->width)){
                etgc->width = current_width;
                etgc->height = current_height;
            
                gnome_canvas_item_set (
                               etgc->rect,
                               "x1", 0.0,
                               "y1", 0.0,
                               "x2", (double) etgc->width,
                               "y2", (double) etgc->height,
                               NULL);
            }
        }
        etgc->need_resize = FALSE;
    }
}
#endif

static int
etgc_event (GnomeCanvasItem *item, GdkEvent *event)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER(item);
    gboolean return_val = TRUE;
    gboolean change_focus = FALSE;
    gboolean use_col = FALSE;
    gint start_col = 0;
    gint old_col;
    EFocus direction = E_FOCUS_START;

    switch (event->type) {
    case GDK_KEY_PRESS:
        if (event->key.keyval == GDK_Tab || 
            event->key.keyval == GDK_KP_Tab || 
            event->key.keyval == GDK_ISO_Left_Tab) {
            change_focus = TRUE;
            use_col      = TRUE;
            start_col    = (event->key.state & GDK_SHIFT_MASK) ? -1 : 0;
            direction    = (event->key.state & GDK_SHIFT_MASK) ? E_FOCUS_END : E_FOCUS_START;
        } else if (event->key.keyval == GDK_Left ||
               event->key.keyval == GDK_KP_Left) {
            change_focus = TRUE;
            use_col      = TRUE;
            start_col    = -1;
            direction    = E_FOCUS_END;
        } else if (event->key.keyval == GDK_Right ||
               event->key.keyval == GDK_KP_Right) {
            change_focus = TRUE;
            use_col   = TRUE;
            start_col = 0;
            direction = E_FOCUS_START;
        } else if (event->key.keyval == GDK_Down ||
               event->key.keyval == GDK_KP_Down) {
            change_focus = TRUE;
            use_col      = FALSE;
            direction    = E_FOCUS_START;
        } else if (event->key.keyval == GDK_Up ||
               event->key.keyval == GDK_KP_Up) {
            change_focus = TRUE;
            use_col      = FALSE;
            direction    = E_FOCUS_END;
        } else if (event->key.keyval == GDK_Return ||
               event->key.keyval == GDK_KP_Enter) {
            change_focus = TRUE;
            use_col      = FALSE;
            direction    = E_FOCUS_START;
        }
        if (change_focus){      
            GList *list;
            for (list = etgc->children; list; list = list->next) {
                ETableGroupContainerChildNode *child_node;
                ETableGroup                   *child;

                child_node = (ETableGroupContainerChildNode *)list->data;
                child      = child_node->child;

                if (e_table_group_get_focus (child)) {
                    old_col = e_table_group_get_focus_column (child);
                    if (old_col == -1)
                        old_col = 0;
                    if (start_col == -1)
                        start_col = e_table_header_count (e_table_group_get_header (child)) - 1;

                    if (direction == E_FOCUS_END)
                        list = list->prev;
                    else
                        list = list->next;
                    
                    if (list) {
                        child_node = (ETableGroupContainerChildNode *)list->data;
                        child = child_node->child;
                        if (use_col)
                            e_table_group_set_focus (child, direction, start_col);
                        else
                            e_table_group_set_focus (child, direction, old_col);
                        return 1;
                    } else {
                        return 0;
                    }
                }
            }
        }
        return_val = FALSE;
    default:
        return_val = FALSE;
    }
    if (return_val == FALSE) {
        if (GNOME_CANVAS_ITEM_CLASS(etgc_parent_class)->event)
            return GNOME_CANVAS_ITEM_CLASS (etgc_parent_class)->event (item, event);
    }
    return return_val;
    
}

/* Realize handler for the text item */
static void
etgc_realize (GnomeCanvasItem *item)
{
    ETableGroupContainer *etgc;

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

    etgc = E_TABLE_GROUP_CONTAINER (item);

    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (etgc));
}

/* Unrealize handler for the etgc item */
static void
etgc_unrealize (GnomeCanvasItem *item)
{
    ETableGroupContainer *etgc;

    etgc = E_TABLE_GROUP_CONTAINER (item);
    
    if (GNOME_CANVAS_ITEM_CLASS (etgc_parent_class)->unrealize)
        (* GNOME_CANVAS_ITEM_CLASS (etgc_parent_class)->unrealize) (item);
}

static void
compute_text (ETableGroupContainer *etgc, ETableGroupContainerChildNode *child_node)
{
    /* FIXME : What a hack, eh? */
    gchar *text = g_strdup_printf ("%s : %s (%d item%s)",
                       etgc->ecol->text,
                       (gchar *)child_node->key,
                       (gint) child_node->count,
                       child_node->count == 1 ? "" : "s");
    gnome_canvas_item_set (child_node->text, 
                   "text", text,
                   NULL);
    g_free (text);
}

static void
child_row_selection (ETableGroup *etg, int row, gboolean selected,
             ETableGroupContainer *etgc)
{
    e_table_group_row_selection (E_TABLE_GROUP (etgc), row, selected);
}

static void
etgc_add (ETableGroup *etg, gint row)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER(etg);
    void *val = e_table_model_value_at (etg->model, etgc->ecol->col_idx, row);
    GCompareFunc comp = etgc->ecol->compare;
    GList *list = etgc->children;
    ETableGroup *child;
    ETableGroupContainerChildNode *child_node;
    int i = 0;

    for (; list; list = g_list_next (list), i++){
        int comp_val;
        child_node = (ETableGroupContainerChildNode *)(list->data);
        comp_val = (*comp)(child_node->key, val);
        if (comp_val == 0) {
            child = child_node->child;
            child_node->count ++;
            e_table_group_add (child, row);
            compute_text (etgc, child_node);
            return;
        }
        if ((comp_val > 0 && etgc->ascending) ||
            (comp_val < 0 && (!etgc->ascending)))
            break;
    }
    child_node = g_new (ETableGroupContainerChildNode, 1);
    child_node->rect = gnome_canvas_item_new (GNOME_CANVAS_GROUP (etgc),
                          gnome_canvas_rect_get_type (),
                          "fill_color", "grey70",
                          "outline_color", "grey50",
                          NULL);
    child_node->text = gnome_canvas_item_new (GNOME_CANVAS_GROUP (etgc),
                          e_text_get_type (),
                          "font_gdk", etgc->font,
                          "anchor", GTK_ANCHOR_SW,
                          "x", (double) 0,
                          "y", (double) 0,
                          "fill_color", "black",
                          NULL);
    child = e_table_group_new (GNOME_CANVAS_GROUP (etgc), etg->full_header,
                   etg->header, etg->model, etgc->sort_info, etgc->n + 1);
    gtk_signal_connect (GTK_OBJECT (child), "row_selection",
                GTK_SIGNAL_FUNC (child_row_selection), etgc);
    child_node->child = child;
    child_node->key = e_table_model_duplicate_value (etg->model, etgc->ecol->col_idx, val);
    child_node->count = 1;
    e_table_group_add (child, row);

    if (list)
        etgc->children = g_list_insert (etgc->children, child_node, i);
    else
        etgc->children = g_list_append (etgc->children, child_node);

    compute_text (etgc, child_node);
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (etgc));
}

static gboolean
etgc_remove (ETableGroup *etg, gint row)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER(etg);
    GList *list;

    for (list = etgc->children ; list; list = g_list_next (list)) {
        ETableGroupContainerChildNode *child_node = list->data;
        ETableGroup                   *child = child_node->child;

        if (e_table_group_remove (child, row)) {
            child_node->count --;
            if (child_node->count == 0) {
                e_table_group_container_child_node_free (etgc, child_node);
                etgc->children = g_list_remove (etgc->children, child_node);
                g_free (child_node);
            } else
                compute_text (etgc, child_node);

            e_canvas_item_request_reflow (GNOME_CANVAS_ITEM (etgc));

            return TRUE;
        }
    }
    return FALSE;
}

static void
etgc_increment (ETableGroup *etg, gint position, gint amount)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER(etg);
    GList *list = etgc->children;

    for (list = etgc->children ; list; list = g_list_next (list))
        e_table_group_increment (((ETableGroupContainerChildNode *)list->data)->child,
                     position, amount);
}

static void
etgc_set_focus (ETableGroup *etg, EFocus direction, gint view_col)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER(etg);
    if (etgc->children) {
        if (direction == E_FOCUS_END)
            e_table_group_set_focus (((ETableGroupContainerChildNode *)g_list_last (etgc->children)->data)->child,
                         direction, view_col);
        else
            e_table_group_set_focus (((ETableGroupContainerChildNode *)etgc->children->data)->child,
                         direction, view_col);
    }
}

static gint
etgc_get_focus_column (ETableGroup *etg)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER(etg);
    if (etgc->children) {
        GList *list;
        for (list = etgc->children; list; list = list->next) {
            ETableGroupContainerChildNode *child_node = (ETableGroupContainerChildNode *)list->data;
            ETableGroup *child = child_node->child;
            if (e_table_group_get_focus (child)) {
                return e_table_group_get_focus_column (child);
            }
        }
    }
    return 0;
}

static void etgc_thaw (ETableGroup *etg)
{
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM(etg));
}

static void
etgc_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
    ETableGroup *etg = E_TABLE_GROUP (object);

    switch (arg_id) {
    case ARG_FROZEN:
        if (GTK_VALUE_BOOL (*arg))
            etg->frozen = TRUE;
        else {
            etg->frozen = FALSE;
            etgc_thaw (etg);
        }
        break;
    case ARG_WIDTH:
        if (E_TABLE_GROUP_CLASS(GTK_OBJECT(etg)->klass)->set_width)
            E_TABLE_GROUP_CLASS(GTK_OBJECT(etg)->klass)->set_width (etg, GTK_VALUE_DOUBLE (*arg));
        break;
    default:
        break;
    }
}

static void
etgc_get_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
    ETableGroup *etg = E_TABLE_GROUP (object);

    switch (arg_id) {
    case ARG_FROZEN:
        GTK_VALUE_BOOL (*arg) = etg->frozen;
        break;
    case ARG_HEIGHT:
        if (E_TABLE_GROUP_CLASS(GTK_OBJECT(etg)->klass)->get_height)
            GTK_VALUE_DOUBLE (*arg) = E_TABLE_GROUP_CLASS(GTK_OBJECT(etg)->klass)->get_height (etg);
        else
            arg->type = GTK_TYPE_INVALID;
        break;
    case ARG_WIDTH: 
        if (E_TABLE_GROUP_CLASS(GTK_OBJECT(etg)->klass)->get_width)
            GTK_VALUE_DOUBLE (*arg) = E_TABLE_GROUP_CLASS(GTK_OBJECT(etg)->klass)->get_width (etg);
        else
            arg->type = GTK_TYPE_INVALID;
        break;
    default:
        arg->type = GTK_TYPE_INVALID;
        break;
    }
}

static void etgc_set_width (ETableGroup *etg, gdouble width)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER (etg);
    GList *list = etgc->children;
    etgc->width = width;

    for (; list; list = g_list_next (list)){
        gdouble child_width = width - GROUP_INDENT;
        ETableGroupContainerChildNode *child_node = (ETableGroupContainerChildNode *)list->data;
        gtk_object_set (GTK_OBJECT(child_node->child),
                   "width", child_width,
                   NULL);

        gnome_canvas_item_set (GNOME_CANVAS_ITEM(child_node->rect),
                      "x1", (double) 0,
                      "x2", (double) etgc->width,
                      NULL);
    }
}

static gdouble etgc_get_width (ETableGroup *etg)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER (etg);
    return etgc->width;
}

static gdouble etgc_get_height (ETableGroup *etg)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER (etg);
    return etgc->height;
}

static void
etgc_class_init (GtkObjectClass *object_class)
{
    GnomeCanvasItemClass *item_class = (GnomeCanvasItemClass *) object_class;
    ETableGroupClass *e_group_class = E_TABLE_GROUP_CLASS(object_class);

    object_class->destroy = etgc_destroy;
    object_class->set_arg = etgc_set_arg;
    object_class->get_arg = etgc_get_arg;

    item_class->event = etgc_event;
    item_class->realize = etgc_realize;
    item_class->unrealize = etgc_unrealize;

    etgc_parent_class = gtk_type_class (PARENT_TYPE);

    e_group_class->add = etgc_add;
    e_group_class->remove = etgc_remove;
    e_group_class->increment = etgc_increment;
    e_group_class->set_focus = etgc_set_focus;
    e_group_class->get_focus_column = etgc_get_focus_column;
    e_group_class->thaw = etgc_thaw;

    e_group_class->get_width = etgc_get_width;
    e_group_class->set_width = etgc_set_width;
    e_group_class->get_height = etgc_get_height;

    gtk_object_add_arg_type ("ETableGroupContainer::height", GTK_TYPE_DOUBLE, 
                 GTK_ARG_READABLE, ARG_HEIGHT);
    gtk_object_add_arg_type ("ETableGroupContainer::width", GTK_TYPE_DOUBLE, 
                 GTK_ARG_READWRITE, ARG_WIDTH);
    gtk_object_add_arg_type ("ETableGroupContainer::frozen", GTK_TYPE_BOOL,
                 GTK_ARG_READWRITE, ARG_FROZEN);
}

static void
etgc_reflow (GnomeCanvasItem *item, gint flags)
{
    ETableGroupContainer *etgc = E_TABLE_GROUP_CONTAINER(item);
    gboolean frozen;

        gtk_object_get (GTK_OBJECT(etgc), 
            "frozen", &frozen,
            NULL);

    if (frozen){
        etgc->idle = 0;
        return;
    }

    if (GTK_OBJECT_FLAGS(etgc)& GNOME_CANVAS_ITEM_REALIZED){
        gdouble old_height;
        
        old_height = etgc->height;
        if (etgc->children == NULL){
        } else {
            GList *list;
            gdouble extra_height;
            gdouble running_height;
            gdouble item_height = 0;
            
            extra_height = 0;
            if (etgc->font)
                extra_height += etgc->font->ascent + etgc->font->descent + BUTTON_PADDING * 2;
            
            extra_height = MAX(extra_height, BUTTON_HEIGHT + BUTTON_PADDING * 2);
                
            running_height = extra_height;
            
            list = etgc->children;
            for (; list; list = g_list_next (list)){
                ETableGroupContainerChildNode *child_node = (ETableGroupContainerChildNode *) list->data;
                ETableGroup *child = child_node->child;
                gtk_object_get (GTK_OBJECT(child),
                        "height", &item_height,
                        NULL);
                
                e_canvas_item_move_absolute (GNOME_CANVAS_ITEM(child_node->text),
                                GROUP_INDENT,
                                running_height - BUTTON_PADDING);
                
                e_canvas_item_move_absolute (GNOME_CANVAS_ITEM(child),
                                GROUP_INDENT,
                                running_height);
                
                gnome_canvas_item_set (GNOME_CANVAS_ITEM(child_node->rect),
                              "x1", (double) 0,
                              "x2", (double) etgc->width,
                              "y1", (double) running_height - extra_height,
                              "y2", (double) running_height + item_height,
                              NULL);
                
                running_height += item_height + extra_height;
            }
            running_height -= extra_height;
            if (running_height != old_height) {
                etgc->height = running_height;
                e_canvas_item_request_parent_reflow (item);
            }
        }
    }
    etgc->idle = 0;
}

static void
etgc_init (GtkObject *object)
{
    ETableGroupContainer *container = E_TABLE_GROUP_CONTAINER(object);
    container->children = FALSE;
    
    e_canvas_item_set_reflow_callback (GNOME_CANVAS_ITEM(object), etgc_reflow);
}

E_MAKE_TYPE (e_table_group_container, "ETableGroupContainer", ETableGroupContainer, etgc_class_init, etgc_init, PARENT_TYPE);