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

/*
 * E-table-view.c: A graphical view of a Table.
 *
 * Author:
 *   Miguel de Icaza (miguel@gnu.org)
 *
 * Copyright 1999, Helix Code, Inc
 */
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <alloca.h>
#include <stdio.h>
#include <libgnomeui/gnome-canvas.h>
#include <gtk/gtksignal.h>
#include "e-util/e-util.h"
#include "e-table.h"
#include "e-table-header-item.h"
#include "e-table-subset.h"
#include "e-table-item.h"
#include "e-table-group.h"

#define COLUMN_HEADER_HEIGHT 16
#define TITLE_HEIGHT         16
#define GROUP_INDENT         10

#define PARENT_TYPE gtk_table_get_type ()

static GtkObjectClass *e_table_parent_class;

static void
et_destroy (GtkObject *object)
{
    ETable *et = E_TABLE (object);
    
    gtk_object_unref (GTK_OBJECT (et->model));
    gtk_object_unref (GTK_OBJECT (et->full_header));
    gtk_object_unref (GTK_OBJECT (et->header));

    g_free (et->group_spec);
    
    (*e_table_parent_class->destroy)(object);
}

static void
e_table_init (GtkObject *object)
{
    ETable *e_table = E_TABLE (object);

    e_table->draw_grid = 1;
    e_table->draw_focus = 1;
    e_table->spreadsheet = 1;
}

static ETableHeader *
e_table_make_header (ETable *e_table, ETableHeader *full_header, const char *cols)
{
    ETableHeader *nh;
    char *copy = alloca (strlen (cols) + 1);
    char *p, *state;
    const int max_cols = e_table_header_count (full_header);
    
    nh = e_table_header_new ();
    strcpy (copy, cols);
    while ((p = strtok_r (copy, ",", &state)) != NULL){
        int col = atoi (p);

        copy = NULL;
        if (col >= max_cols)
            continue;

        e_table_header_add_column (nh, e_table_header_get_column (full_header, col), -1);
    }
    
    return nh;
}

static void
header_canvas_size_alocate (GtkWidget *widget, GtkAllocation *alloc, ETable *e_table)
{
    gnome_canvas_set_scroll_region (
        GNOME_CANVAS (e_table->header_canvas),
        0, 0, alloc->width, COLUMN_HEADER_HEIGHT);
}

static void
e_table_setup_header (ETable *e_table)
{
    e_table->header_canvas = GNOME_CANVAS (gnome_canvas_new ());

    gtk_widget_show (GTK_WIDGET (e_table->header_canvas));

    e_table->header_item = gnome_canvas_item_new (
        gnome_canvas_root (e_table->header_canvas),
        e_table_header_item_get_type (),
        "ETableHeader", e_table->header,
        "x", 0,
        "y", 0,
        NULL);

    gtk_signal_connect (
        GTK_OBJECT (e_table->header_canvas), "size_allocate",
        GTK_SIGNAL_FUNC (header_canvas_size_alocate), e_table);
                 
    gtk_widget_set_usize (GTK_WIDGET (e_table->header_canvas), -1, COLUMN_HEADER_HEIGHT);
    
    gtk_table_attach (
        GTK_TABLE (e_table), GTK_WIDGET (e_table->header_canvas),
        0, 1, 0, 1, GTK_FILL | GTK_EXPAND, 0, 0, 0);
        
}

typedef struct {
    void *value;
    GArray *array;
} group_key_t;

static GArray *
e_table_create_groups (ETableModel *etm, int key_col, GCompareFunc comp)
{
    GArray *groups;
    const int rows = e_table_model_row_count (etm);
    int row, i;
    
    groups = g_array_new (FALSE, FALSE, sizeof (group_key_t));

    for (row = 0; row < rows; row++){
        void *val = e_table_model_value_at (etm, key_col, row);
        const int n_groups = groups->len;

        /*
         * Should replace this with a bsearch later
         */
        for (i = 0; i < n_groups; i++){
            group_key_t *g = &g_array_index (groups, group_key_t, i);
            
            if ((*comp) (g->value, val)){
                g_array_append_val (g->array, row);
                break;
            }
        }
        if (i != n_groups)
            continue;

        /*
         * We need to create a new group
         */
        {
            group_key_t gk;

            gk.value = val;
            gk.array = g_array_new (FALSE, FALSE, sizeof (int));

            g_array_append_val (gk.array, row);
            g_array_append_val (groups, gk);
        }
    }

    return groups;
}

static void
e_table_destroy_groups (GArray *groups)
{
    const int n = groups->len;
    int i;
    
    for (i = 0; i < n; i++){
        group_key_t *g = &g_array_index (groups, group_key_t, i);

        g_array_free (g->array, TRUE);
    }
    g_array_free (groups, TRUE);
}

static ETableModel **
e_table_make_subtables (ETableModel *model, GArray *groups)
{
    const int n_groups = groups->len;
    ETableModel **tables;
    int i;

    tables = g_new (ETableModel *, n_groups+1);

    for (i = 0; i < n_groups; i++){
        group_key_t *g = &g_array_index (groups, group_key_t, i);
        const int sub_size = g->array->len;
        ETableSubset *ss;
        int j;

        tables [i] = e_table_subset_new (model, sub_size);
        ss = E_TABLE_SUBSET (tables [i]);
        
        for (j = 0; j < sub_size; j++)
            ss->map_table [j] = g_array_index (g->array, int, j);
    }
    tables [i] = NULL;
        
    return (ETableModel **) tables;
}

typedef struct _Node Node;

struct _Node {
    Node            *parent;
    GnomeCanvasItem *item;
    ETableModel     *table_model;
    GSList          *children;

    guint is_leaf:1;
};

static Node *
leaf_new (GnomeCanvasItem *table_item, ETableModel *table_model, Node *parent)
{
    Node *node = g_new (Node, 1);

    g_assert (table_item != NULL);
    g_assert (table_model != NULL);
    g_assert (parent != NULL);
    
    node->item = table_item;
    node->parent = parent;
    node->table_model = table_model;
    node->is_leaf = 1;

    g_assert (!parent->is_leaf);
    
    parent->children = g_slist_append (parent->children, node);

    e_table_group_add (E_TABLE_GROUP (parent->item), table_item);

    return node;
}

static Node *
node_new (GnomeCanvasItem *group_item, ETableModel *table_model, Node *parent)
{
    Node *node = g_new (Node, 1);

    g_assert (table_model != NULL);

    node->children = NULL;
    node->item = group_item;
    node->parent = parent;
    node->table_model = table_model;
    node->is_leaf = 0;

    if (parent){
        parent->children = g_slist_append (parent->children, node);

        e_table_group_add (E_TABLE_GROUP (parent->item), group_item);
    }
    
    return node;
}

static Node *
e_table_create_leaf (ETable *e_table, ETableModel *etm, Node *parent)
{
    GnomeCanvasItem *table_item;
    static double last_y;
    Node *leaf;
    
    table_item = gnome_canvas_item_new (
        GNOME_CANVAS_GROUP (parent->item),
        e_table_item_get_type (),
        "ETableHeader", e_table->header,
        "ETableModel",  etm,
        "drawgrid", e_table->draw_grid,
        "drawfocus", e_table->draw_focus,
        "spreadsheet", e_table->spreadsheet,
        NULL);

    leaf = leaf_new (table_item, etm, parent);
    
    return leaf;
}

static int
leaf_height (Node *leaf)
{
    const GnomeCanvasItem *item = leaf->item;
    
    return item->y2 - item->y1;
}

static int
leaf_event (GnomeCanvasItem *item, GdkEvent *event)
{
    static int last_x = -1;
    static int last_y = -1;
    
    if (event->type == GDK_BUTTON_PRESS){
        last_x = event->button.x;
        last_y = event->button.y;
    } else if (event->type == GDK_BUTTON_RELEASE){
        last_x = -1;
        last_y = -1;
    } else if (event->type == GDK_MOTION_NOTIFY){
        if (last_x == -1)
            return FALSE;
        
        gnome_canvas_item_move (item, event->motion.x - last_x, event->motion.y - last_y);
        last_x = event->motion.x;
        last_y = event->motion.y;
    } else
        return FALSE;
    return TRUE;
}

static Node *
e_table_create_nodes (ETable *e_table, ETableModel *model, ETableHeader *header,
              GnomeCanvasGroup *root, Node *parent, int *groups_list)
{
    GArray *groups;
    ETableModel **tables;
    ETableCol *ecol;
    int key_col, i;
    GnomeCanvasItem *group_item;
    Node *group;

    key_col = *groups_list;
    g_assert (key_col != -1);
    
    /*
     * Create groups
     */
    ecol = e_table_header_get_column (header, key_col);

    g_assert (ecol != NULL);
    
    groups = e_table_create_groups (model, key_col, ecol->compare);
    tables = e_table_make_subtables (e_table->model, groups);
    e_table_destroy_groups (groups);

    group_item = e_table_group_new (root, ecol, TRUE, parent == NULL);
    group = node_new (group_item, model, parent);
    
    for (i = 0; tables [i] != NULL; i++){
        Node *node;
        
        /*
         * Leafs
         */
        if (groups_list [1] == -1){
            GnomeCanvasItem *item_leaf_header;
            Node *leaf_header;
            
            item_leaf_header = e_table_group_new (
                GNOME_CANVAS_GROUP (group_item), ecol, TRUE, FALSE);
            leaf_header = node_new (item_leaf_header, tables [i], group);

            e_table_create_leaf (e_table, tables [i], leaf_header);
        } else {
            e_table_create_nodes (
                e_table, tables [i], header, GNOME_CANVAS_GROUP (group_item),
                group, &groups_list [1]);
        }
    }

    return group;
}

static int *
group_spec_to_desc (const char *group_spec)
{
    int a_size = 10;
    int *elements;
    char *p, *copy, *follow;
    int n_elements = 0;

    if (group_spec == NULL)
        return NULL;

    elements = g_new (int, a_size); 
    copy = alloca (strlen (group_spec) + 1);
    strcpy (copy, group_spec);

    while ((p = strtok_r (copy, ",", &follow)) != NULL){
        elements [n_elements] = atoi (p);
        ++n_elements;
        if (n_elements+1 == a_size){
            int *new_e;
            
            n_elements += 10;
            new_e = g_renew (int, elements, n_elements);
            if (new_e == NULL){
                g_free (elements);
                return NULL;
            }
            elements = new_e;
        }
        copy = NULL;
    }

    /* Tag end */
    elements [n_elements] = -1;
    
    return elements;
}

/*
 * The ETableCanvas object is just used to enable us to
 * hook up to the realize/unrealize phases of the canvas
 * initialization (as laying out the subtables requires us to
 * know the actual size of the subtables we are inserting
 */
 
#define E_TABLE_CANVAS_PARENT_TYPE gnome_canvas_get_type ()

typedef struct {
    GnomeCanvas base;

    ETable *e_table;
} ETableCanvas;

typedef struct {
    GnomeCanvasClass base_class;
} ETableCanvasClass;

static GnomeCanvasClass *e_table_canvas_parent_class;

static void
e_table_canvas_realize (GtkWidget *widget)
{
    ETableCanvas *e_table_canvas = (ETableCanvas *) widget;
    ETable *e_table = e_table_canvas->e_table;
    int *groups;
    Node *leaf;
    
    GTK_WIDGET_CLASS (e_table_canvas_parent_class)->realize (widget);
    
    groups = group_spec_to_desc (e_table->group_spec);

    e_table->root = gnome_canvas_item_new (
        GNOME_CANVAS_GROUP (e_table->table_canvas->root),
        gnome_canvas_group_get_type (),
        "x", 0.0,
        "y", 0.0,
        NULL);
        
    leaf = e_table_create_nodes (
        e_table, e_table->model,
        e_table->header, GNOME_CANVAS_GROUP (e_table->root), 0, groups);

    gnome_canvas_set_scroll_region (
        GNOME_CANVAS (e_table_canvas),
        0, 0,
        e_table_header_total_width (e_table->header) + 200,
        leaf_height (leaf));

    if (groups)
        g_free (groups);
}

static void
e_table_canvas_unrealize (GtkWidget *widget)
{
    ETableCanvas *e_table_canvas = (ETableCanvas *) widget;
    ETable *e_table = e_table_canvas->e_table;
    
    gtk_object_destroy (GTK_OBJECT (e_table->root));
    e_table->root = NULL;

    GTK_WIDGET_CLASS (e_table_canvas_parent_class)->unrealize (widget);
}

static void
e_table_canvas_class_init (GtkObjectClass *object_class)
{
    GtkWidgetClass *widget_class = (GtkWidgetClass *) object_class;

    widget_class->realize = e_table_canvas_realize;
    widget_class->unrealize = e_table_canvas_unrealize;

    e_table_canvas_parent_class = gtk_type_class (E_TABLE_CANVAS_PARENT_TYPE);
}

static void
e_table_canvas_init (GtkObject *canvas)
{
    GTK_WIDGET_SET_FLAGS (canvas, GTK_CAN_FOCUS);
}

GtkType e_table_canvas_get_type (void);

E_MAKE_TYPE (e_table_canvas, "ETableCanvas", ETableCanvas, e_table_canvas_class_init,
         e_table_canvas_init, E_TABLE_CANVAS_PARENT_TYPE);

static GnomeCanvas *
e_table_canvas_new (ETable *e_table)
{
    ETableCanvas *e_table_canvas;

    e_table_canvas = gtk_type_new (e_table_canvas_get_type ());
    e_table_canvas->e_table = e_table;

    return GNOME_CANVAS (e_table_canvas);
}

static void
e_table_setup_table (ETable *e_table)
{
    e_table->table_canvas = e_table_canvas_new (e_table);

    gtk_widget_show (GTK_WIDGET (e_table->table_canvas));
    gtk_table_attach (
        GTK_TABLE (e_table), GTK_WIDGET (e_table->table_canvas),
        0, 1, 1, 2, GTK_FILL | GTK_EXPAND, GTK_FILL | GTK_EXPAND, 0, 0);
}

void
e_table_construct (ETable *e_table, ETableHeader *full_header, ETableModel *etm,
           const char *cols_spec, const char *group_spec)
{
    GTK_TABLE (e_table)->homogeneous = FALSE;

    gtk_table_resize (GTK_TABLE (e_table), 1, 2);

    e_table->full_header = full_header;
    gtk_object_ref (GTK_OBJECT (full_header));

    e_table->model = etm;
    gtk_object_ref (GTK_OBJECT (etm));

    e_table->header = e_table_make_header (e_table, full_header, cols_spec);

    e_table_setup_header (e_table);
    e_table_setup_table (e_table);

    e_table->group_spec = g_strdup (group_spec);

}

GtkWidget *
e_table_new (ETableHeader *full_header, ETableModel *etm, const char *cols_spec, const char *group_spec)
{
    ETable *e_table;

    e_table = gtk_type_new (e_table_get_type ());

    e_table_construct (e_table, full_header, etm, cols_spec, group_spec);
        
    return (GtkWidget *) e_table;
}

static void
e_table_class_init (GtkObjectClass *object_class)
{
    e_table_parent_class = gtk_type_class (PARENT_TYPE);

    object_class->destroy = et_destroy;
}

E_MAKE_TYPE(e_table, "ETable", ETable, e_table_class_init, e_table_init, PARENT_TYPE);