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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * e-table-model.c: a Table Model
 *
 * Authors:
 *   Miguel de Icaza (miguel@gnu.org)
 *   Chris Lahey (clahey@helixcode.com)
 *
 * (C) 1999, 2000 Helix Code, Inc.
 */
#include <config.h>
#include <gtk/gtksignal.h>
#include "e-table-model.h"

#define ETM_CLASS(e) ((ETableModelClass *)((GtkObject *)e)->klass)

#define PARENT_TYPE gtk_object_get_type ()

#define d(x)

d(static gint depth = 0);


static GtkObjectClass *e_table_model_parent_class;

enum {
    MODEL_CHANGED,
    MODEL_PRE_CHANGE,
    MODEL_ROW_CHANGED,
    MODEL_CELL_CHANGED,
    MODEL_ROW_INSERTED,
    MODEL_ROW_DELETED,
    ROW_SELECTION,
    LAST_SIGNAL
};

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

/**
 * e_table_model_column_count:
 * @e_table_model: The e-table-model to operate on
 *
 * Returns: the number of columns in the table model.
 */
int
e_table_model_column_count (ETableModel *e_table_model)
{
    g_return_val_if_fail (e_table_model != NULL, 0);
    g_return_val_if_fail (E_IS_TABLE_MODEL (e_table_model), 0);

    return ETM_CLASS (e_table_model)->column_count (e_table_model);
}


/**
 * e_table_model_row_count:
 * @e_table_model: the e-table-model to operate on
 *
 * Returns: the number of rows in the Table model.
 */
int
e_table_model_row_count (ETableModel *e_table_model)
{
    g_return_val_if_fail (e_table_model != NULL, 0);
    g_return_val_if_fail (E_IS_TABLE_MODEL (e_table_model), 0);

    return ETM_CLASS (e_table_model)->row_count (e_table_model);
}

/**
 * e_table_value_at:
 * @e_table_model: the e-table-model to operate on
 * @col: column in the model to pull data from.
 * @row: row in the model to pull data from.
 *
 * Return value: This function returns the value that is stored
 * by the @e_table_model in column @col and row @row.  The data
 * returned can be a pointer or any data value that can be stored
 * inside a pointer.
 *
 * The data returned is typically used by an ECell renderer
 */
void *
e_table_model_value_at (ETableModel *e_table_model, int col, int row)
{
    g_return_val_if_fail (e_table_model != NULL, NULL);
    g_return_val_if_fail (E_IS_TABLE_MODEL (e_table_model), NULL);

    return ETM_CLASS (e_table_model)->value_at (e_table_model, col, row);
}

/**
 * e_table_model_set_value_at:
 * @e_table_model: the table model to operate on.
 * @col: the column where the data will be stored in the model.
 * @row: the row where the data will be stored in the model. 
 * @data: the data to be stored.
 *
 * This function instructs the model to store the value in @data in the
 * the @e_table_model at column @col and row @row.  The @data typically
 * comes from one of the ECell rendering objects.
 *
 * There should be an agreement between the Table Model and the user
 * of this function about the data being stored.  Typically it will
 * be a pointer to a set of data, or a datum that fits inside a void *.
 */
void
e_table_model_set_value_at (ETableModel *e_table_model, int col, int row, const void *data)
{
    g_return_if_fail (e_table_model != NULL);
    g_return_if_fail (E_IS_TABLE_MODEL (e_table_model));

    ETM_CLASS (e_table_model)->set_value_at (e_table_model, col, row, data);
}

/**
 * e_table_model_is_cell_editable:
 * @e_table_model: the table model to query.
 * @col: column to query.
 * @row: row to query.
 *
 * Returns: %TRUE if the cell in @e_table_model at @col,@row can be
 * edited, %FALSE otherwise
 */
gboolean
e_table_model_is_cell_editable (ETableModel *e_table_model, int col, int row)
{
    g_return_val_if_fail (e_table_model != NULL, FALSE);
    g_return_val_if_fail (E_IS_TABLE_MODEL (e_table_model), FALSE);

    return ETM_CLASS (e_table_model)->is_cell_editable (e_table_model, col, row);
}

/**
 * e_table_model_append_row:
 * @e_table_model: the table model to append the a row to.
 * @source:
 * @row:
 *
 */
void
e_table_model_append_row (ETableModel *e_table_model, ETableModel *source, int row)
{
    g_return_if_fail (e_table_model != NULL);
    g_return_if_fail (E_IS_TABLE_MODEL (e_table_model));

    if (ETM_CLASS (e_table_model)->append_row)
        ETM_CLASS (e_table_model)->append_row (e_table_model, source, row);
}

const char *
e_table_model_row_sort_group(ETableModel *e_table_model, int row)
{
    g_return_val_if_fail (e_table_model != NULL, "/");
    g_return_val_if_fail (E_IS_TABLE_MODEL (e_table_model), "/");

    if (ETM_CLASS (e_table_model)->row_sort_group)
        return ETM_CLASS (e_table_model)->row_sort_group (e_table_model, row);
    else
        return "/";
}

gboolean
e_table_model_has_sort_group(ETableModel *e_table_model)
{
    g_return_val_if_fail (e_table_model != NULL, FALSE);
    g_return_val_if_fail (E_IS_TABLE_MODEL (e_table_model), FALSE);

    if (ETM_CLASS (e_table_model)->has_sort_group)
        return ETM_CLASS (e_table_model)->has_sort_group (e_table_model);
    else
        return FALSE;
}

void *
e_table_model_duplicate_value (ETableModel *e_table_model, int col, const void *value)
{
    g_return_val_if_fail (e_table_model != NULL, NULL);
    g_return_val_if_fail (E_IS_TABLE_MODEL (e_table_model), NULL);

    if (ETM_CLASS (e_table_model)->duplicate_value)
        return ETM_CLASS (e_table_model)->duplicate_value (e_table_model, col, value);
    else
        return NULL;
}

void
e_table_model_free_value (ETableModel *e_table_model, int col, void *value)
{
    g_return_if_fail (e_table_model != NULL);
    g_return_if_fail (E_IS_TABLE_MODEL (e_table_model));

    if (ETM_CLASS (e_table_model)->free_value)
        ETM_CLASS (e_table_model)->free_value (e_table_model, col, value);
}

void *
e_table_model_initialize_value (ETableModel *e_table_model, int col)
{
    g_return_val_if_fail (e_table_model != NULL, NULL);
    g_return_val_if_fail (E_IS_TABLE_MODEL (e_table_model), NULL);

    if (ETM_CLASS (e_table_model)->initialize_value)
        return ETM_CLASS (e_table_model)->initialize_value (e_table_model, col);
    else
        return NULL;
}

gboolean
e_table_model_value_is_empty (ETableModel *e_table_model, int col, const void *value)
{
    g_return_val_if_fail (e_table_model != NULL, FALSE);
    g_return_val_if_fail (E_IS_TABLE_MODEL (e_table_model), FALSE);

    if (ETM_CLASS (e_table_model)->value_is_empty)
        return ETM_CLASS (e_table_model)->value_is_empty (e_table_model, col, value);
    else
        return FALSE;
}

char *
e_table_model_value_to_string (ETableModel *e_table_model, int col, const void *value)
{
    g_return_val_if_fail (e_table_model != NULL, NULL);
    g_return_val_if_fail (E_IS_TABLE_MODEL (e_table_model), NULL);

    if (ETM_CLASS (e_table_model)->value_to_string)
        return ETM_CLASS (e_table_model)->value_to_string (e_table_model, col, value);
    else
        return g_strdup("");
}

static void
e_table_model_destroy (GtkObject *object)
{
    if (e_table_model_parent_class->destroy)
        (*e_table_model_parent_class->destroy)(object);
}

static void
e_table_model_class_init (GtkObjectClass *object_class)
{
    ETableModelClass *klass = E_TABLE_MODEL_CLASS(object_class);
    e_table_model_parent_class = gtk_type_class (PARENT_TYPE);
    
    object_class->destroy = e_table_model_destroy;

    e_table_model_signals [MODEL_CHANGED] =
        gtk_signal_new ("model_changed",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableModelClass, model_changed),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);

    e_table_model_signals [MODEL_PRE_CHANGE] =
        gtk_signal_new ("model_pre_change",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableModelClass, model_pre_change),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);

    e_table_model_signals [MODEL_ROW_CHANGED] =
        gtk_signal_new ("model_row_changed",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableModelClass, model_row_changed),
                gtk_marshal_NONE__INT,
                GTK_TYPE_NONE, 1, GTK_TYPE_INT);

    e_table_model_signals [MODEL_CELL_CHANGED] =
        gtk_signal_new ("model_cell_changed",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableModelClass, model_cell_changed),
                gtk_marshal_NONE__INT_INT,
                GTK_TYPE_NONE, 2, GTK_TYPE_INT, GTK_TYPE_INT);

    e_table_model_signals [MODEL_ROW_INSERTED] =
        gtk_signal_new ("model_row_inserted",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableModelClass, model_row_inserted),
                gtk_marshal_NONE__INT,
                GTK_TYPE_NONE, 1, GTK_TYPE_INT);

    e_table_model_signals [MODEL_ROW_DELETED] =
        gtk_signal_new ("model_row_deleted",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableModelClass, model_row_deleted),
                gtk_marshal_NONE__INT,
                GTK_TYPE_NONE, 1, GTK_TYPE_INT);

    gtk_object_class_add_signals (object_class, e_table_model_signals, LAST_SIGNAL);

    klass->column_count = NULL;     
    klass->row_count = NULL;        
    klass->value_at = NULL;         
    klass->set_value_at = NULL;     
    klass->is_cell_editable = NULL; 
    klass->append_row = NULL;

    klass->row_sort_group = NULL;
    klass->has_sort_group = NULL;

    klass->duplicate_value = NULL;  
    klass->free_value = NULL;       
    klass->initialize_value = NULL; 
    klass->value_is_empty = NULL;   
    klass->value_to_string = NULL;
    klass->model_changed = NULL;    
    klass->model_row_changed = NULL;
    klass->model_cell_changed = NULL;
    klass->model_row_inserted = NULL;
    klass->model_row_deleted = NULL;
}


guint
e_table_model_get_type (void)
{
    static guint type = 0;
    
    if (!type)
    {
        GtkTypeInfo info =
        {
            "ETableModel",
            sizeof (ETableModel),
            sizeof (ETableModelClass),
            (GtkClassInitFunc) e_table_model_class_init,
            NULL,
            /* reserved_1 */ NULL,
            /* reserved_2 */ NULL,
            (GtkClassInitFunc) NULL,
        };
        
        type = gtk_type_unique (PARENT_TYPE, &info);
    }

  return type;
}

#if d(!)0
static void
print_tabs (void)
{
    int i;
    for (i = 0; i < depth; i++)
        g_print("\t");
}
#endif

void
e_table_model_pre_change (ETableModel *e_table_model)
{
    g_return_if_fail (e_table_model != NULL);
    g_return_if_fail (E_IS_TABLE_MODEL (e_table_model));
    
    d(print_tabs());
    d(g_print("Emitting pre_change on model 0x%p.\n", e_table_model));
    d(depth++);
    gtk_signal_emit (GTK_OBJECT (e_table_model),
             e_table_model_signals [MODEL_PRE_CHANGE]);
    d(depth--);
}

/**
 * e_table_model_changed:
 * @e_table_model: the table model to notify of the change
 *
 * Use this function to notify any views of this table model that
 * the contents of the table model have changed.  This will emit
 * the signal "model_changed" on the @e_table_model object.
 *
 * It is preferable to use the e_table_model_row_changed() and
 * the e_table_model_cell_changed() to notify of smaller changes
 * than to invalidate the entire model, as the views might have
 * ways of caching the information they render from the model.
 */
void
e_table_model_changed (ETableModel *e_table_model)
{
    g_return_if_fail (e_table_model != NULL);
    g_return_if_fail (E_IS_TABLE_MODEL (e_table_model));
    
    d(print_tabs());
    d(g_print("Emitting model_changed on model 0x%p.\n", e_table_model));
    d(depth++);
    gtk_signal_emit (GTK_OBJECT (e_table_model),
             e_table_model_signals [MODEL_CHANGED]);
    d(depth--);
}

/**
 * e_table_model_row_changed:
 * @e_table_model: the table model to notify of the change
 * @row: the row that was changed in the model.
 *
 * Use this function to notify any views of the table model that
 * the contents of row @row have changed in model.  This function
 * will emit the "model_row_changed" signal on the @e_table_model
 * object
 */
void
e_table_model_row_changed (ETableModel *e_table_model, int row)
{
    g_return_if_fail (e_table_model != NULL);
    g_return_if_fail (E_IS_TABLE_MODEL (e_table_model));

    d(print_tabs());
    d(g_print("Emitting row_changed on model 0x%p, row %d.\n", e_table_model, row));
    d(depth++);
    gtk_signal_emit (GTK_OBJECT (e_table_model),
             e_table_model_signals [MODEL_ROW_CHANGED], row);
    d(depth--);
}

/**
 * e_table_model_cell_changed:
 * @e_table_model: the table model to notify of the change
 * @col: the column.
 * @row: the row
 *
 * Use this function to notify any views of the table model that
 * contents of the cell at @col,@row has changed. This will emit
 * the "model_cell_changed" signal on the @e_table_model
 * object
 */
void
e_table_model_cell_changed (ETableModel *e_table_model, int col, int row)
{
    g_return_if_fail (e_table_model != NULL);
    g_return_if_fail (E_IS_TABLE_MODEL (e_table_model));

    d(print_tabs());
    d(g_print("Emitting cell_changed on model 0x%p, row %d, col %d.\n", e_table_model, row, col));
    d(depth++);
    gtk_signal_emit (GTK_OBJECT (e_table_model),
             e_table_model_signals [MODEL_CELL_CHANGED], col, row);
    d(depth--);
}

/**
 * e_table_model_row_inserted:
 * @e_table_model: the table model to notify of the change
 * @row: the row that was inserted into the model.
 *
 * Use this function to notify any views of the table model that
 * the row @row has been inserted into the model.  This function
 * will emit the "model_row_inserted" signal on the @e_table_model
 * object
 */
void
e_table_model_row_inserted (ETableModel *e_table_model, int row)
{
    g_return_if_fail (e_table_model != NULL);
    g_return_if_fail (E_IS_TABLE_MODEL (e_table_model));

    d(print_tabs());
    d(g_print("Emitting row_inserted on model 0x%p, row %d.\n", e_table_model, row));
    d(depth++);
    gtk_signal_emit (GTK_OBJECT (e_table_model),
             e_table_model_signals [MODEL_ROW_INSERTED], row);
    d(depth--);
}

/**
 * e_table_model_row_deleted:
 * @e_table_model: the table model to notify of the change
 * @row: the row that was deleted
 *
 * Use this function to notify any views of the table model that
 * the row @row has been deleted from the model.  This function
 * will emit the "model_row_deleted" signal on the @e_table_model
 * object
 */
void
e_table_model_row_deleted (ETableModel *e_table_model, int row)
{
    g_return_if_fail (e_table_model != NULL);
    g_return_if_fail (E_IS_TABLE_MODEL (e_table_model));

    d(print_tabs());
    d(g_print("Emitting row_deleted on model 0x%p, row %d.\n", e_table_model, row));
    d(depth++);
    gtk_signal_emit (GTK_OBJECT (e_table_model),
             e_table_model_signals [MODEL_ROW_DELETED], row);
    d(depth--);
}