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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * E-table-item.c: A GnomeCanvasItem that is a view of an ETableModel.
 *
 * Author:
 *   Miguel de Icaza (miguel@gnu.org)
 *
 * Copyright 1999, Helix Code, Inc.
 *
 * TODO:
 *   Add a border to the thing, so that focusing works properly.
 *
 */
#include <config.h>
#include <stdio.h>
#include <gtk/gtksignal.h>
#include <gdk/gdkkeysyms.h>
#include <math.h>
#include "e-table-item.h"
#include "e-cell.h"
#include "e-util/e-canvas.h"

#define PARENT_OBJECT_TYPE gnome_canvas_item_get_type ()

#define FOCUSED_BORDER 2

static GnomeCanvasItemClass *eti_parent_class;

enum {
    ROW_SELECTION,
    LAST_SIGNAL
};

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

enum {
    ARG_0,
    ARG_TABLE_HEADER,
    ARG_TABLE_MODEL,
    ARG_TABLE_DRAW_GRID,
    ARG_TABLE_DRAW_FOCUS,
    ARG_MODE_SPREADSHEET,
    ARG_LENGHT_THRESHOLD,
    
    ARG_WIDTH,
    ARG_HEIGHT,
    ARG_HAS_FOCUS
};

static int eti_get_height (ETableItem *eti);

static gboolean
eti_editing (ETableItem *eti)
{
    if (eti->editing_col == -1)
        return FALSE;
    else
        return TRUE;
}

/*
 * During realization, we have to invoke the per-ecell realize routine
 * (On our current setup, we have one e-cell per column.
 *
 * We might want to optimize this to only realize the unique e-cells:
 * ie, a strings-only table, uses the same e-cell for every column, and
 * we might want to avoid realizing each e-cell.
 */
static void
eti_realize_cell_views (ETableItem *eti)
{
    int i;
    
    for (i = 0; i < eti->n_cells; i++)
        e_cell_realize (eti->cell_views [i]);
    eti->cell_views_realized = 1;
}

static void
eti_attach_cell_views (ETableItem *eti)
{
    int i;

    g_assert (eti->header);
    g_assert (eti->table_model);
    
    /*
     * Now realize the various ECells
     */
    eti->n_cells = eti->cols;
    eti->cell_views = g_new (ECellView *, eti->n_cells);

    for (i = 0; i < eti->n_cells; i++){
        ETableCol *col = e_table_header_get_column (eti->header, i);
        
        eti->cell_views [i] = e_cell_new_view (col->ecell, eti->table_model, eti);
    }

    eti->needs_compute_height = 1;
    e_canvas_item_request_reflow(GNOME_CANVAS_ITEM(eti));
    eti->needs_redraw = 1;
    gnome_canvas_item_request_update(GNOME_CANVAS_ITEM(eti));
}

/*
 * During unrealization: we invoke every e-cell (one per column in the current
 * setup) to dispose all X resources allocated
 */
static void
eti_unrealize_cell_views (ETableItem *eti)
{
    int i;

    if (eti->cell_views_realized == 0)
        return;
    
    for (i = 0; i < eti->n_cells; i++)
        e_cell_unrealize (eti->cell_views [i]);
    eti->cell_views_realized = 0;
}

static void
eti_detach_cell_views (ETableItem *eti)
{
    int i;
    
    for (i = 0; i < eti->n_cells; i++){
        e_cell_kill_view (eti->cell_views [i]);
        eti->cell_views [i] = NULL;
    }
        
    g_free (eti->cell_views);
    eti->cell_views = NULL;
    eti->n_cells = 0;
}

static void
eti_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
{
}

static void
eti_reflow (GnomeCanvasItem *item, gint flags)
{
    ETableItem *eti = E_TABLE_ITEM (item);
    if ( eti->needs_compute_height ) {
        int new_height = eti_get_height (eti);
        if ( new_height != eti->height ) {
            eti->height = new_height;
            e_canvas_item_request_parent_reflow(GNOME_CANVAS_ITEM(eti));
        }
        eti->needs_compute_height = 0;
    }
}

/*
 * GnomeCanvasItem::update method
 */
static void
eti_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
    double i2c [6];
    ArtPoint c1, c2, i1, i2;
    ETableItem *eti = E_TABLE_ITEM (item);

    if (GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->update)
        (*GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->update)(item, affine, clip_path, flags);
    
    gnome_canvas_item_i2c_affine (item, i2c);

    i1.x = eti->x1;
    i1.y = eti->y1;
    i2.x = eti->x1 + eti->width;
    i2.y = eti->y1 + eti->height;
    art_affine_point (&c1, &i1, i2c);
    art_affine_point (&c2, &i2, i2c);

    eti_bounds (item, &item->x1, &item->y1, &item->x2, &item->y2);
    if ( item->x1 != c1.x ||
         item->y1 != c1.y ||
         item->x2 != c2.x + 1 ||
         item->y2 != c2.y + 1 )
        {
            gnome_canvas_request_redraw(item->canvas, item->x1, item->y1, item->x2, item->y2);
            item->x1 = c1.x;
            item->y1 = c1.y;
            item->x2 = c2.x + 1;
            item->y2 = c2.y + 1;
            eti->needs_redraw = 1;
        }
    if ( eti->needs_redraw ) {
        gnome_canvas_request_redraw(item->canvas, item->x1, item->y1, item->x2, item->y2);
        eti->needs_redraw = 0;
    }
}

/*
 * eti_remove_table_model:
 *
 * Invoked to release the table model associated with this ETableItem
 */
static void
eti_remove_table_model (ETableItem *eti)
{
    if (!eti->table_model)
        return;

    gtk_signal_disconnect (GTK_OBJECT (eti->table_model),
                   eti->table_model_change_id);
    gtk_signal_disconnect (GTK_OBJECT (eti->table_model),
                   eti->table_model_row_change_id);
    gtk_object_unref (GTK_OBJECT (eti->table_model));

    eti->table_model_change_id = 0;
    eti->table_model_row_change_id = 0;
    eti->table_model = NULL;
}

/*
 * eti_remove_header_model:
 *
 * Invoked to release the header model associated with this ETableItem
 */
static void
eti_remove_header_model (ETableItem *eti)
{
    if (!eti->header)
        return;

    gtk_signal_disconnect (GTK_OBJECT (eti->header),
                   eti->header_structure_change_id);
    gtk_signal_disconnect (GTK_OBJECT (eti->header),
                   eti->header_dim_change_id);

    if (eti->cell_views){
        eti_unrealize_cell_views (eti);
        eti_detach_cell_views (eti);
    }
    gtk_object_unref (GTK_OBJECT (eti->header));


    eti->header_structure_change_id = 0;
    eti->header_dim_change_id = 0;
    eti->header = NULL;
}

/*
 * eti_row_height:
 *
 * Returns the height used by row @row.  This does not include the one-pixel
 * used as a separator between rows
 */
static int
eti_row_height (ETableItem *eti, int row)
{
    const int cols = e_table_header_count (eti->header);
    int col;
    int h, max_h;

    g_assert (eti->cell_views);
    
    max_h = 0;
    
    for (col = 0; col < cols; col++){
        ETableCol *ecol = e_table_header_get_column (eti->header, col);
        
        h = e_cell_height (eti->cell_views [col], ecol->col_idx, col, row);

        if (h > max_h)
            max_h = h;
    }
    return max_h;
}

/*
 * eti_get_height:
 *
 * Returns the height of the ETableItem.
 *
 * The ETableItem might compute the whole height by asking every row its
 * size.  There is a special mode (designed to work when there are too
 * many rows in the table that performing the previous step could take 
 * too long) set by the ETableItem->length_threshold that would determine
 * when the height is computed by using the first row as the size for
 * every other row in the ETableItem.
 */
static int
eti_get_height (ETableItem *eti)
{
    const int rows = eti->rows;
    int row;
    int height;

    if (rows == 0)
        return 0;

    if (eti->length_threshold != -1){
        if (rows > eti->length_threshold){
            height = (eti_row_height (eti, 0) + 1) * rows;

            /*
             * 1 pixel at the top
             */
            return height + 1;
        }
    }

    height = 1;
    for (row = 0; row < rows; row++)
        height += eti_row_height (eti, row) + 1;

    return height;
}

static void
eti_item_region_redraw (ETableItem *eti, int x0, int y0, int x1, int y1)
{
    GnomeCanvasItem *item = GNOME_CANVAS_ITEM (eti);
    ArtDRect rect;
    double i2c [6];
    
    rect.x0 = x0;
    rect.y0 = y0;
    rect.x1 = x1;
    rect.y1 = y1;

    gnome_canvas_item_i2c_affine (item, i2c);
    art_drect_affine_transform (&rect, &rect, i2c);
    
    gnome_canvas_request_redraw (item->canvas, rect.x0, rect.y0, rect.x1, rect.y1);
}

/*
 * Callback routine: invoked when the ETableModel has suffered a change
 */
static void
eti_table_model_changed (ETableModel *table_model, ETableItem *eti)
{
    eti->rows = e_table_model_row_count (eti->table_model);
    
    if (eti->focused_row > eti->rows - 1) {
        eti->focused_row = eti->rows - 1;
    }

    eti->needs_compute_height = 1;
    e_canvas_item_request_reflow(GNOME_CANVAS_ITEM(eti));
    eti->needs_redraw = 1;
    gnome_canvas_item_request_update(GNOME_CANVAS_ITEM(eti));
}

/* Unused. */
#if 0
/*
 * eti_request_redraw:
 *
 * Queues a canvas redraw for the entire ETableItem.
 */
static void
eti_request_redraw (ETableItem *eti)
{
    eti_item_region_redraw (eti, eti->x1, eti->y1, eti->x1 + eti->width + 1, eti->y1 + eti->height + 1);
}
#endif

/*
 * Computes the distance between @start_row and @end_row in pixels
 */
static int
eti_row_diff (ETableItem *eti, int start_row, int end_row)
{
    int row, total;

    total = 0;
    
    for (row = start_row; row < end_row; row++)
        total += eti_row_height (eti, row) + 1;

    return total;
}

/*
 * eti_request_region_redraw:
 *
 * Request a canvas redraw on the range (start_col, start_row) to (end_col, end_row).
 * This is inclusive (ie, you can use: 0,0-0,0 to redraw the first cell).
 *
 * The @border argument is a number of pixels around the region that should also be queued
 * for redraw.   This is typically used by the focus routines to queue a redraw for the
 * border as well.
 */
static void
eti_request_region_redraw (ETableItem *eti,
               int start_col, int start_row,
               int end_col, int end_row, int border)
{
    int x1, y1, width, height;
    
    x1 = e_table_header_col_diff (eti->header, 0, start_col);
    y1 = eti_row_diff (eti, 0, start_row);
    width = e_table_header_col_diff (eti->header, start_col, end_col + 1);
    height = eti_row_diff (eti, start_row, end_row + 1);

    eti_item_region_redraw (eti, eti->x1 + x1 - border,
                     eti->y1 + y1 - border,
                     eti->x1 + x1 + width + 1 + border,
                     eti->y1 + y1 + height + 1 + border);
}

static void
eti_table_model_row_changed (ETableModel *table_model, int row, ETableItem *eti)
{
    if (eti->renderers_can_change_size){
        eti_table_model_changed (table_model, eti);
        return;
    }

    eti_request_region_redraw (eti, 0, row, eti->cols, row, 0);
}

void
e_table_item_redraw_range (ETableItem *eti,
               int start_col, int start_row,
               int end_col, int end_row)
{
    int border;
    
    g_return_if_fail (eti != NULL);
    g_return_if_fail (E_IS_TABLE_ITEM (eti));

    if ((start_col == eti->focused_col) ||
        (end_col   == eti->focused_col) ||
        (start_row == eti->focused_row) ||
        (end_row   == eti->focused_row))
        border = 2;
    else
        border = 0;

    eti_request_region_redraw (eti, start_col, start_row, end_col, end_row, border);
}

static void
eti_add_table_model (ETableItem *eti, ETableModel *table_model)
{
    g_assert (eti->table_model == NULL);
    
    eti->table_model = table_model;
    gtk_object_ref (GTK_OBJECT (eti->table_model));
    
    eti->table_model_change_id = gtk_signal_connect (
        GTK_OBJECT (table_model), "model_changed",
        GTK_SIGNAL_FUNC (eti_table_model_changed), eti);

    eti->table_model_row_change_id = gtk_signal_connect (
        GTK_OBJECT (table_model), "model_row_changed",
        GTK_SIGNAL_FUNC (eti_table_model_row_changed), eti);

    if (eti->header){
        eti_detach_cell_views (eti);
        eti_attach_cell_views (eti);
    }
    
    eti_table_model_changed (table_model, eti);
}

static void
eti_header_dim_changed (ETableHeader *eth, int col, ETableItem *eti)
{
    eti->needs_redraw = 1;
    gnome_canvas_item_request_update(GNOME_CANVAS_ITEM(eti));
}

static void
eti_header_structure_changed (ETableHeader *eth, ETableItem *eti)
{
    eti->cols = e_table_header_count (eti->header);
    eti->width = e_table_header_total_width (eti->header);

    /*
     * There should be at least one column
     */
    g_assert (eti->cols != 0);
    
    if (eti->cell_views){
        eti_unrealize_cell_views (eti);
        eti_detach_cell_views (eti);
        eti_attach_cell_views (eti);
        eti_realize_cell_views (eti);
    } else {
        if (eti->table_model){
            eti_detach_cell_views (eti);
            eti_attach_cell_views (eti);
        }
    }
    eti->needs_redraw = 1;
    gnome_canvas_item_request_update(GNOME_CANVAS_ITEM(eti));
}

static void
eti_add_header_model (ETableItem *eti, ETableHeader *header)
{
    g_assert (eti->header == NULL);
    
    eti->header = header;
    gtk_object_ref (GTK_OBJECT (header));

    eti_header_structure_changed (header, eti);
    
    eti->header_dim_change_id = gtk_signal_connect (
        GTK_OBJECT (header), "dimension_change",
        GTK_SIGNAL_FUNC (eti_header_dim_changed), eti);

    eti->header_structure_change_id = gtk_signal_connect (
        GTK_OBJECT (header), "structure_change",
        GTK_SIGNAL_FUNC (eti_header_structure_changed), eti);
}

/*
 * GtkObject::destroy method
 */
static void
eti_destroy (GtkObject *object)
{
    ETableItem *eti = E_TABLE_ITEM (object);

    eti_remove_header_model (eti);
    eti_remove_table_model (eti);

    g_slist_free (eti->selection);
    
    if (GTK_OBJECT_CLASS (eti_parent_class)->destroy)
        (*GTK_OBJECT_CLASS (eti_parent_class)->destroy) (object);
}

static void
eti_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    GnomeCanvasItem *item;
    ETableItem *eti;

    item = GNOME_CANVAS_ITEM (o);
    eti = E_TABLE_ITEM (o);

    switch (arg_id){
    case ARG_TABLE_HEADER:
        eti_remove_header_model (eti);
        eti_add_header_model (eti, E_TABLE_HEADER(GTK_VALUE_OBJECT (*arg)));
        break;

    case ARG_TABLE_MODEL:
        eti_remove_table_model (eti);
        eti_add_table_model (eti, E_TABLE_MODEL(GTK_VALUE_OBJECT (*arg)));
        break;
        
    case ARG_LENGHT_THRESHOLD:
        eti->length_threshold = GTK_VALUE_INT (*arg);
        break;

    case ARG_TABLE_DRAW_GRID:
        eti->draw_grid = GTK_VALUE_BOOL (*arg);
        break;

    case ARG_TABLE_DRAW_FOCUS:
        eti->draw_focus = GTK_VALUE_BOOL (*arg);
        break;

    case ARG_MODE_SPREADSHEET:
        eti->mode_spreadsheet = GTK_VALUE_BOOL (*arg);
        break;
    }
    eti->needs_redraw = 1;
    gnome_canvas_item_request_update(GNOME_CANVAS_ITEM(eti));
}

static void
eti_get_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    GnomeCanvasItem *item;
    ETableItem *eti;

    item = GNOME_CANVAS_ITEM (o);
    eti = E_TABLE_ITEM (o);

    switch (arg_id){
    case ARG_WIDTH:
        GTK_VALUE_DOUBLE (*arg) = eti->width;
        break;
    case ARG_HEIGHT:
        GTK_VALUE_DOUBLE (*arg) = eti->height;
        break;
    default:
        arg->type = GTK_TYPE_INVALID;
    }
}

static void
eti_init (GnomeCanvasItem *item)
{
    ETableItem *eti = E_TABLE_ITEM (item);

    eti->focused_col = -1;
    eti->focused_row = -1;
    eti->editing_col = -1;
    eti->editing_row = -1;
    eti->height = 0;
    
    eti->length_threshold = -1;
    eti->renderers_can_change_size = 1;
    
    eti->selection_mode = GTK_SELECTION_SINGLE;

    eti->needs_redraw = 0;
    eti->needs_compute_height = 0;

    e_canvas_item_set_reflow_callback(GNOME_CANVAS_ITEM(eti), eti_reflow);
}

#define gray50_width 2
#define gray50_height 2
static const char gray50_bits[] = {
    0x02, 0x01, };

static void
eti_realize (GnomeCanvasItem *item)
{
    ETableItem *eti = E_TABLE_ITEM (item);
    GtkWidget *canvas_widget = GTK_WIDGET (item->canvas);
    GdkWindow *window;
    
    if (GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->realize)
                (*GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->realize)(item);

    /*
     * Gdk Resource allocation
     */
    window = canvas_widget->window;

    eti->fill_gc = canvas_widget->style->white_gc;
    gdk_gc_ref (canvas_widget->style->white_gc);

    eti->grid_gc = gdk_gc_new (window);
#if 0
    /* This sets it to gray */
/*  gdk_gc_set_foreground (eti->grid_gc, &canvas_widget->style->bg [GTK_STATE_NORMAL]); */
#else
    gdk_gc_set_foreground (eti->grid_gc, &canvas_widget->style->black);
#endif
    eti->focus_gc = gdk_gc_new (window);
    gdk_gc_set_foreground (eti->focus_gc, &canvas_widget->style->bg [GTK_STATE_NORMAL]);
    gdk_gc_set_background (eti->focus_gc, &canvas_widget->style->fg [GTK_STATE_NORMAL]);
    eti->stipple = gdk_bitmap_create_from_data (NULL, gray50_bits, gray50_width, gray50_height);
    gdk_gc_set_ts_origin (eti->focus_gc, 0, 0);
    gdk_gc_set_stipple (eti->focus_gc, eti->stipple);
    gdk_gc_set_fill (eti->focus_gc, GDK_OPAQUE_STIPPLED);

    if (eti->cell_views == NULL)
        eti_attach_cell_views (eti);
    
    eti_realize_cell_views (eti);

    eti->needs_compute_height = 1;
    e_canvas_item_request_reflow (GNOME_CANVAS_ITEM(eti));
    eti->needs_redraw = 1;
    gnome_canvas_item_request_update(GNOME_CANVAS_ITEM(eti));
}

static void
eti_unrealize (GnomeCanvasItem *item)
{
    ETableItem *eti = E_TABLE_ITEM (item);
    
    gdk_gc_unref (eti->fill_gc);
    eti->fill_gc = NULL;
    gdk_gc_unref (eti->grid_gc);
    eti->grid_gc = NULL;
    gdk_gc_unref (eti->focus_gc);
    eti->focus_gc = NULL;
    gdk_bitmap_unref (eti->stipple);
    eti->stipple = NULL;
    
    eti_unrealize_cell_views (eti);

    eti->height = 0;
    
    if (GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->unrealize)
                (*GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->unrealize)(item);
}

static void
eti_draw (GnomeCanvasItem *item, GdkDrawable *drawable, int x, int y, int width, int height)
{
    ETableItem *eti = E_TABLE_ITEM (item);
    const int rows = eti->rows;
    const int cols = eti->cols;
    int row, col, y1, y2;
    int first_col, last_col, x_offset;
    int first_row, last_row, y_offset, yd;
    int x1, x2;
    int f_x1, f_x2, f_y1, f_y2;
    gboolean f_found;
    double i2c [6];
    ArtPoint eti_base, eti_base_item;
    
    /*
     * Clear the background
     */
#if 0
    gdk_draw_rectangle (
        drawable, eti->fill_gc, TRUE,
        eti->x1 - x, eti->y1 - y, eti->width, eti->height);
#endif

    /*
     * Find out our real position after grouping
     */
    gnome_canvas_item_i2c_affine (item, i2c);
    eti_base_item.x = eti->x1;
    eti_base_item.y = eti->y1;
    art_affine_point (&eti_base, &eti_base_item, i2c);

    /*
     * First column to draw, last column to draw
     */
    first_col = -1;
    last_col = x_offset = 0;
    x1 = x2 = floor (eti_base.x);
    for (col = 0; col < cols; col++, x1 = x2){
        ETableCol *ecol = e_table_header_get_column (eti->header, col);

        x2 = x1 + ecol->width;
        
        if (x1 > (x + width))
            break;
        if (x2 < x)
            continue;
        if (first_col == -1){
            x_offset = x1 - x;
            first_col = col;
        }
    }
    last_col = col;

    /*
     * Nothing to paint
     */
    if (first_col == -1)
        return;

    /*
     * Compute row span.
     */
    first_row = -1;
    y_offset = 0;
    y1 = y2 = floor (eti_base.y) + 1;
    for (row = 0; row < rows; row++, y1 = y2){

        y2 += eti_row_height (eti, row) + 1;

        if (y1 > y + height)
            break;

        if (y2 < y)
            continue;

        if (first_row == -1){
            y_offset = y1 - y;
            first_row = row;
        }
    }
    last_row = row;

    if (first_row == -1)
        return;

    /*
     * Draw cells
     */
    yd = y_offset;
    f_x1 = f_x2 = f_y1 = f_y2 = -1;
    f_found = FALSE;

    if (eti->draw_grid && first_row == 0){
        gdk_draw_line (
            drawable, eti->grid_gc,
                eti_base.x - x, yd, eti_base.x + eti->width - x, yd);
    }
    yd++;
    
    for (row = first_row; row < last_row; row++){
        int xd, height;
        gboolean selected;
        
        height = eti_row_height (eti, row);

        xd = x_offset;
/*      printf ("paint: %d %d\n", yd, yd + height); */

        selected = g_slist_find (eti->selection, GINT_TO_POINTER (row)) != NULL;
        
        for (col = first_col; col < last_col; col++){
            ETableCol *ecol = e_table_header_get_column (eti->header, col);
            ECellView *ecell_view = eti->cell_views [col];

            e_cell_draw (ecell_view, drawable, ecol->col_idx, col, row, selected,
                     xd, yd, xd + ecol->width, yd + height);
            
            if (col == eti->focused_col && row == eti->focused_row){
                f_x1 = xd;
                f_x2 = xd + ecol->width;
                f_y1 = yd;
                f_y2 = yd + height;
                f_found = TRUE;
            }

            xd += ecol->width;
        }
        yd += height;

        if (eti->draw_grid)
            gdk_draw_line (
                drawable, eti->grid_gc,
                eti_base.x - x, yd, eti_base.x + eti->width - x, yd);
        yd++;
    }

    if (eti->draw_grid){
        int xd = x_offset;
        
        for (col = first_col; col <= last_col; col++){
            ETableCol *ecol = e_table_header_get_column (eti->header, col);

            gdk_draw_line (
                drawable, eti->grid_gc,
                xd, y_offset, xd, yd - 1);

            /*
             * This looks wierd, but it is to draw the last line
             */
            if (ecol)
                xd += ecol->width;
        }
    }
    
    /*
     * Draw focus
     */
    if (f_found && eti->draw_focus){

        if (!eti_editing (eti))
            gdk_draw_rectangle (
                drawable, eti->focus_gc, FALSE,
                f_x1 + 1, f_y1, f_x2 - f_x1 - 2, f_y2 - f_y1 - 1);
    }
}

static double
eti_point (GnomeCanvasItem *item, double x, double y, int cx, int cy,
       GnomeCanvasItem **actual_item)
{
    *actual_item = item;

    return 0.0;
}

static gboolean
find_cell (ETableItem *eti, double x, double y, int *col_res, int *row_res, double *x1_res, double *y1_res)
{
    const int cols = eti->cols;
    const int rows = eti->rows;
    gdouble x1, y1, x2, y2;
    int col, row;
    
    /* FIXME: this routine is inneficient, fix later */

    x -= eti->x1;
    y -= eti->y1;
    
    x1 = 0;
    for (col = 0; col < cols; col++, x1 = x2){
        ETableCol *ecol = e_table_header_get_column (eti->header, col);

        if (x < x1)
            return FALSE;
        
        x2 = x1 + ecol->width;

        if (x > x2)
            continue;

        *col_res = col;
        if (x1_res)
            *x1_res = x - x1;
        break;
    }

    y1 = y2 = 0;
    for (row = 0; row < rows; row++, y1 = y2){
        if (y < y1)
            return FALSE;
        
        y2 += eti_row_height (eti, row) + 1;

        if (y > y2)
            continue;

        *row_res = row;
        if (y1_res)
            *y1_res = y - y1;
        break;
    }

    return TRUE;
}

static void
eti_cursor_move (ETableItem *eti, gint row, gint column)
{
    e_table_item_leave_edit (eti);
    e_table_item_focus (eti, column, row);
}

static void
eti_cursor_move_left (ETableItem *eti)
{
    eti_cursor_move(eti, eti->focused_row, eti->focused_col - 1);
}

static void
eti_cursor_move_right (ETableItem *eti)
{
    eti_cursor_move(eti, eti->focused_row, eti->focused_col + 1);
}

static void
eti_cursor_move_up (ETableItem *eti)
{
    eti_cursor_move(eti, eti->focused_row - 1, eti->focused_col);
}

static void
eti_cursor_move_down (ETableItem *eti)
{
    eti_cursor_move(eti, eti->focused_row + 1, eti->focused_col);
}

static int
eti_event (GnomeCanvasItem *item, GdkEvent *e)
{
    ETableItem *eti = E_TABLE_ITEM (item);
    ECellView *ecell_view;
    ETableCol *ecol;
    gint return_val = TRUE;

    switch (e->type){
    case GDK_BUTTON_PRESS:
    case GDK_BUTTON_RELEASE:
    case GDK_2BUTTON_PRESS: {
        double x1, y1;
        int col, row;
        
        gnome_canvas_item_w2i (item, &e->button.x, &e->button.y);
        
        if (!find_cell (eti, e->button.x, e->button.y, &col, &row, &x1, &y1))
            return TRUE;

        if (eti->focused_row == row && eti->focused_col == col){

            ecol = e_table_header_get_column (eti->header, col);
            ecell_view = eti->cell_views [col];

            /*
             * Adjust the event positions
             */
            e->button.x = x1; 
            e->button.y = y1;
            
            e_cell_event (ecell_view, e, ecol->col_idx, col, row);
        } else {
            /*
             * Focus the cell, and select the row
             */
            e_table_item_leave_edit (eti);
            e_table_item_focus (eti, col, row);
            e_table_item_select_row (eti, row);
        }
        break;
    }

    case GDK_MOTION_NOTIFY: {
        int col, row;
        double x1, y1;

        gnome_canvas_item_w2i (item, &e->motion.x, &e->motion.y);

        if (!find_cell (eti, e->motion.x, e->motion.y, &col, &row, &x1, &y1))
            return TRUE;

        if (eti->focused_row == row && eti->focused_col == col){
            ecol = e_table_header_get_column (eti->header, col);
            ecell_view = eti->cell_views [col];

            /*
             * Adjust the event positions
             */
            e->motion.x = x1;
            e->motion.y = y1;
            
            e_cell_event (ecell_view, e, ecol->col_idx, col, row);
        }
        break;
    }
        
    case GDK_KEY_PRESS:
        if (eti->focused_col == -1)
            return FALSE;

        switch (e->key.keyval){
        case GDK_Left:
            if (!eti->mode_spreadsheet && eti_editing (eti))
                break;
            
            if (eti->focused_col > 0)
                eti_cursor_move_left (eti);
            break;
            
        case GDK_Right:
            if (!eti->mode_spreadsheet && eti_editing (eti))
                break;
            
            if (eti->focused_col < eti->cols - 1)
                eti_cursor_move_right (eti);
            break;
            
        case GDK_Up:
            if (eti->focused_row > 0)
                eti_cursor_move_up (eti);
            else
                return_val = FALSE;
            break;
            
        case GDK_Down:
            if ((eti->focused_row + 1) < eti->rows)
                eti_cursor_move_down (eti);
            else
                return_val = FALSE;
            break;

        case GDK_Tab:
        case GDK_KP_Tab:
        case GDK_ISO_Left_Tab:
            if ((e->key.state & GDK_SHIFT_MASK) != 0){
                /* shift tab */
                if (eti->focused_col > 0)
                    eti_cursor_move_left (eti);
                else if (eti->focused_row > 0)
                    eti_cursor_move(eti, eti->focused_row - 1, eti->cols - 1);
                else
                    return_val = FALSE;
            } else {
                if (eti->focused_col < eti->cols - 1)
                    eti_cursor_move_right (eti);
                else if (eti->focused_row < eti->rows - 1)
                    eti_cursor_move(eti, eti->focused_row + 1, 0);
                else 
                    return_val = FALSE;
            }
            break;
            
        default:
            if (!eti_editing (eti)){
                if ((e->key.state & (GDK_MOD1_MASK | GDK_CONTROL_MASK)) != 0)
                    return_val = FALSE;

                if (!(e->key.keyval >= 0x20 && e->key.keyval <= 0xff))
                    return_val = FALSE;
            }

            ecol = e_table_header_get_column (eti->header, eti->focused_col);
            ecell_view = eti->cell_views [eti->focused_col];
            e_cell_event (ecell_view, e, ecol->col_idx, eti->focused_col, eti->focused_row);
        }
        break;
        
    case GDK_KEY_RELEASE:
        if (eti->focused_col == -1)
            return FALSE;

        if (eti_editing (eti)){
            ecell_view = eti->cell_views [eti->editing_col];
            ecol = e_table_header_get_column (eti->header, eti->editing_col);
            e_cell_event (ecell_view, e, ecol->col_idx, eti->editing_col, eti->editing_row);
        }
        break;

    case GDK_FOCUS_CHANGE:
        if (e->focus_change.in) {
        } else {
            e_table_item_leave_edit (eti);
            e_table_item_unfocus (eti);
        }

    default:
        return_val = FALSE;
    }
    return return_val;
}

/*
 * ETableItem::row_selection method
 */
static void
eti_row_selection (ETableItem *eti, int row, gboolean selected)
{
    eti_request_region_redraw (eti, 0, row, eti->cols - 1, row, 0);
    
    if (selected)
        eti->selection = g_slist_prepend (eti->selection, GINT_TO_POINTER (row));
    else
        eti->selection = g_slist_remove (eti->selection, GINT_TO_POINTER (row));
    
}

static void
eti_class_init (GtkObjectClass *object_class)
{
    GnomeCanvasItemClass *item_class = (GnomeCanvasItemClass *) object_class;
    ETableItemClass *eti_class = (ETableItemClass *) object_class;
    
    eti_parent_class = gtk_type_class (PARENT_OBJECT_TYPE);
    
    object_class->destroy = eti_destroy;
    object_class->set_arg = eti_set_arg;
    object_class->get_arg = eti_get_arg;

    item_class->update      = eti_update;
    item_class->realize     = eti_realize;
    item_class->unrealize   = eti_unrealize;
    item_class->draw        = eti_draw;
    item_class->point       = eti_point;
    item_class->event       = eti_event;
    
    eti_class->row_selection = eti_row_selection;

    gtk_object_add_arg_type ("ETableItem::ETableHeader", GTK_TYPE_OBJECT,
                 GTK_ARG_WRITABLE, ARG_TABLE_HEADER);
    gtk_object_add_arg_type ("ETableItem::ETableModel", GTK_TYPE_OBJECT,
                 GTK_ARG_WRITABLE, ARG_TABLE_MODEL);
    gtk_object_add_arg_type ("ETableItem::drawgrid", GTK_TYPE_BOOL,
                 GTK_ARG_WRITABLE, ARG_TABLE_DRAW_GRID);
    gtk_object_add_arg_type ("ETableItem::drawfocus", GTK_TYPE_BOOL,
                 GTK_ARG_WRITABLE, ARG_TABLE_DRAW_FOCUS);
    gtk_object_add_arg_type ("ETableItem::spreadsheet", GTK_TYPE_BOOL,
                 GTK_ARG_WRITABLE, ARG_MODE_SPREADSHEET);

    gtk_object_add_arg_type ("ETableItem::width", GTK_TYPE_DOUBLE, 
                 GTK_ARG_READWRITE, ARG_WIDTH); 
    gtk_object_add_arg_type ("ETableItem::height", GTK_TYPE_DOUBLE, 
                 GTK_ARG_READABLE, ARG_HEIGHT);
    gtk_object_add_arg_type ("ETableItem::has_focus", GTK_TYPE_BOOL,
                 GTK_ARG_READWRITE, ARG_HAS_FOCUS);

    eti_signals [ROW_SELECTION] =
        gtk_signal_new ("row_selection",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ETableItemClass, row_selection),
                gtk_marshal_NONE__INT_INT,
                GTK_TYPE_NONE, 2, GTK_TYPE_INT, GTK_TYPE_INT);
    
    gtk_object_class_add_signals (object_class, eti_signals, LAST_SIGNAL);

}

GtkType
e_table_item_get_type (void)
{
    static GtkType type = 0;

    if (!type){
        GtkTypeInfo info = {
            "ETableItem",
            sizeof (ETableItem),
            sizeof (ETableItemClass),
            (GtkClassInitFunc) eti_class_init,
            (GtkObjectInitFunc) eti_init,
            NULL, /* reserved 1 */
            NULL, /* reserved 2 */
            (GtkClassInitFunc) NULL
        };

        type = gtk_type_unique (PARENT_OBJECT_TYPE, &info);
    }

    return type;
}

void
e_table_item_focus (ETableItem *eti, int col, int row)
{
    g_return_if_fail (eti != NULL);
    g_return_if_fail (E_IS_TABLE_ITEM (eti));
    
    /*
     * make sure we have the Gtk Focus
     */
    gnome_canvas_item_grab_focus (GNOME_CANVAS_ITEM (eti));

    if (eti->focused_col != -1)
        e_table_item_unfocus (eti);

    eti->focused_col = col;
    eti->focused_row = row;

    eti_request_region_redraw (eti, col, row, col, row, FOCUSED_BORDER);
}

void
e_table_item_unfocus (ETableItem *eti)
{
    g_return_if_fail (eti != NULL);
    g_return_if_fail (E_IS_TABLE_ITEM (eti));

    if (eti->focused_row == -1)
        return;

    {
        const int col = eti->focused_col;
        const int row = eti->focused_row;
        
        eti_request_region_redraw (eti, col, row, col, row, FOCUSED_BORDER);
        while ( eti->selection ) {
            e_table_item_unselect_row (eti, GPOINTER_TO_INT(eti->selection->data));
        }
    }
    eti->focused_col = -1;
    eti->focused_row = -1;  
}

gint
e_table_item_get_focused_column (ETableItem *eti)
{   
    g_return_val_if_fail (eti != NULL, -1);
    g_return_val_if_fail (E_IS_TABLE_ITEM (eti), -1);

    return eti->focused_col;
}


const GSList *
e_table_item_get_selection (ETableItem *eti)
{
    g_return_val_if_fail (eti != NULL, NULL);
    g_return_val_if_fail (E_IS_TABLE_ITEM (eti), NULL);

    return eti->selection;
}

GtkSelectionMode
e_table_item_get_selection_mode (ETableItem *eti)
{
    g_return_val_if_fail (eti != NULL, GTK_SELECTION_SINGLE);
    g_return_val_if_fail (E_IS_TABLE_ITEM (eti), GTK_SELECTION_SINGLE);

    return eti->selection_mode;
}

void
e_table_item_set_selection_mode (ETableItem *eti, GtkSelectionMode selection_mode)
{
    g_return_if_fail (eti != NULL);
    g_return_if_fail (E_IS_TABLE_ITEM (eti));

    if (selection_mode == GTK_SELECTION_BROWSE ||
        selection_mode == GTK_SELECTION_EXTENDED){
        g_error ("GTK_SELECTION_BROWSE and GTK_SELECTION_EXTENDED are not implemented");
    }
    
    eti->selection_mode = selection_mode;
}

gboolean
e_table_item_is_row_selected (ETableItem *eti, int row)
{
    g_return_val_if_fail (eti != NULL, FALSE);
    g_return_val_if_fail (E_IS_TABLE_ITEM (eti), FALSE);

    if (g_slist_find (eti->selection, GINT_TO_POINTER (row)))
        return TRUE;
    else
        return FALSE;
}

void
e_table_item_unselect_row (ETableItem *eti, int row)
{
    g_return_if_fail (eti != NULL);
    g_return_if_fail (E_IS_TABLE_ITEM (eti));

    if (e_table_item_is_row_selected (eti, row)){
        gtk_signal_emit (
            GTK_OBJECT (eti), eti_signals [ROW_SELECTION],
            row, 0);
    }
}

void
e_table_item_select_row (ETableItem *eti, int row)
{
    g_return_if_fail (eti != NULL);
    g_return_if_fail (E_IS_TABLE_ITEM (eti));

    switch (eti->selection_mode){
    case GTK_SELECTION_SINGLE:
        if (eti->selection){
            gtk_signal_emit (
                GTK_OBJECT (eti), eti_signals [ROW_SELECTION],
                GPOINTER_TO_INT (eti->selection->data), 0);
        }
        g_slist_free (eti->selection);
        eti->selection = NULL;

        gtk_signal_emit (
            GTK_OBJECT (eti), eti_signals [ROW_SELECTION],
            GINT_TO_POINTER (row), 1);
        break;
                
    case GTK_SELECTION_MULTIPLE:
        if (g_slist_find (eti->selection, GINT_TO_POINTER (row)))
            return;
        gtk_signal_emit (
            GTK_OBJECT (eti), eti_signals [ROW_SELECTION],
            GINT_TO_POINTER (row), 1);
        break;

    default:
        
    }
}

void
e_table_item_enter_edit (ETableItem *eti, int col, int row)
{
    ETableCol *ecol;
    
    g_return_if_fail (eti != NULL);
    g_return_if_fail (E_IS_TABLE_ITEM (eti));

    eti->editing_col = col;
    eti->editing_row = row;

    ecol = e_table_header_get_column (eti->header, col);
    eti->edit_ctx = e_cell_enter_edit (eti->cell_views [col], ecol->col_idx, col, row);
}

void
e_table_item_leave_edit (ETableItem *eti)
{
    ETableCol *ecol;

    g_return_if_fail (eti != NULL);
    g_return_if_fail (E_IS_TABLE_ITEM (eti));

    if (!eti_editing (eti))
        return;

    ecol = e_table_header_get_column (eti->header, eti->editing_col);
    e_cell_leave_edit (
        eti->cell_views [eti->editing_col],
        ecol->col_idx, eti->editing_col,
        eti->editing_row, eti->edit_ctx);
    eti->editing_col = -1;
    eti->editing_row = -1;
    eti->edit_ctx = NULL;
}