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

/*
 * E-Table-Group.c: Implements the grouping objects for elements on a table
 *
 * Author:
 *   Miguel de Icaza (miguel@gnu.org()
 *
 * Copyright 1999, Helix Code, Inc.
 */

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

#define TITLE_HEIGHT         16
#define GROUP_INDENT         10

#define PARENT_TYPE gnome_canvas_group_get_type ()

static GnomeCanvasGroupClass *etg_parent_class;

enum {
    HEIGHT_CHANGED,
    LAST_SIGNAL
};

static gint etg_signals [LAST_SIGNAL] = { 0, };

static void
etg_destroy (GtkObject *object)
{
    ETableGroup *etg = E_TABLE_GROUP (object);
    
    GTK_OBJECT_CLASS (etg_parent_class)->destroy (object);
}

static void
etg_dim (ETableGroup *etg, int *width, int *height)
{
    GSList *l;

    *width = *height = 0;
    
    for (l = etg->children; l; l = l->next){
        GnomeCanvasItem *child = l->data;

        *height += child->y2 - child->y1;
        *width  += child->x2 - child->x1;
    }

    if (!etg->transparent){
        *height += TITLE_HEIGHT;
        *width  += GROUP_INDENT;
    }
}

void
e_table_group_construct (GnomeCanvasGroup *parent, ETableGroup *etg, 
             ETableCol *ecol, gboolean open,
             gboolean transparent)
{
    gnome_canvas_item_constructv (GNOME_CANVAS_ITEM (etg), parent, 0, NULL);
    
    etg->ecol = ecol;
    etg->open = open;
    etg->transparent = transparent;
    
    etg_dim (etg, &etg->width, &etg->height);

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

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

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

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

GnomeCanvasItem *
e_table_group_new (GnomeCanvasGroup *parent, ETableCol *ecol, 
           gboolean open, gboolean transparent)
{
    ETableGroup *etg;

    g_return_val_if_fail (parent != NULL, NULL);
    g_return_val_if_fail (ecol != NULL, NULL);
    
    etg = gtk_type_new (e_table_group_get_type ());

    e_table_group_construct (parent, etg, ecol, open, transparent);

    return GNOME_CANVAS_ITEM (etg);
}

static void
etg_relayout (GnomeCanvasItem *eti, ETableGroup *etg)
{
    GSList *l;
    int height = etg->transparent ? 0 : GROUP_INDENT;
    gboolean move = FALSE;
    
    printf ("Relaying out\n");
    
    for (l = etg->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 != etg->height){
        etg->height = height;
        gtk_signal_emit (GTK_OBJECT (etg), etg_signals [HEIGHT_CHANGED]);
    }
}

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_slist_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){
        GSList *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 ("Positioning item %p at %d\n", item, height);
        gnome_canvas_item_set (
            item,
            "y", (double) height,
            "x", (double) x,
            NULL);

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

static void
etg_realize (GnomeCanvasItem *item)
{
    ETableGroup *etg = E_TABLE_GROUP (item);
    GSList *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);
        }
    }
}

static void
etg_class_init (GtkObjectClass *object_class)
{
    GnomeCanvasItemClass *item_class = (GnomeCanvasItemClass *) object_class;

    object_class->destroy = etg_destroy;

    item_class->realize = etg_realize;
    item_class->update = etg_update;
    
    etg_parent_class = gtk_type_class (PARENT_TYPE);

    etg_signals [HEIGHT_CHANGED] =
        gtk_signal_new ("height_changed",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableGroupClass, height_changed),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);
    
    gtk_object_class_add_signals (object_class, etg_signals, LAST_SIGNAL);
    
}

E_MAKE_TYPE (e_table_group, "ETableGroup", ETableGroup, etg_class_init, NULL, PARENT_TYPE);