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

/*
 * E-table-item.c: A view of a Table.
 *
 * Author:
 *   Miguel de Icaza (miguel@gnu.org)
 *
 * Copyright 1999, Helix Code, Inc.
 */
#include <config.h>
#include "e-table-item.h"

#define PARENT_OBJECT_TYPE gnome_canvas_item_get_type ()

static GnomeCanvasItemClass *eti_parent_class;

enum {
    ARG_0,
    ARG_TABLE_HEADER,
    ARG_TABLE_MODEL,
    ARG_TABLE_X,
    ARG_TABLE_Y,
};

static void
eti_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
    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);

    item->x1 = eti->x1;
    item->y1 = eti->y1;
    item->x2 = INT_MAX;
    item->y2 = eti->x1 + eti->height;

    gnome_canvas_group_child_bounds (GNOME_CANVAS_GROUP (item->parent), item);
}

static void
eti_remove_table_model (ETableItem *eti)
{
    if (!eti->table_model)
        return;

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

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

static void
eti_remove_header_model (ETableItem *eti)
{
    if (!eti->header)
        return;

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

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

static void
eti_table_model_changed (ETableModel *table_model, ETableItem *eti)
{
    eti->height = e_table_model_height (eti->table_model);

    eti_update (GNOME_CANVAS_ITEM (eti), NULL, NULL, 0);
}

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 (table_model));
    eti->table_model_change_id = gtk_signal_connect (
        GTK_OBJECT (table_model), "model_changed",
        GTK_SIGNAL_FUNC (eti_table_model_changed), eti);
}

static void
eti_header_dim_changed (ETableHeader *eth, int col, ETableItem *eti)
{
    printf ("NOTIFY: Dimension changed");
}

static void
eti_header_structure_changed (ETableHeader *eth, ETableItem *eti)
{
    printf ("NOTIFY: Structure changed");
}

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_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);
}

static void
eti_destroy (GtkObject *object)
{
    ETableItem *eti = E_TABLE_ITEM (object);

    eti_remove_header_model (eti);
    eti_remove_table_model (eti);
    
    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;
    int v;

    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, GTK_VALUE_POINTER (*arg));
        break;

    case ARG_TABLE_MODEL:
        eti_remove_table_model (eti);
        eti_add_table_model (eti, GTK_VALUE_POINTER (*arg));

        eti->height = e_table_model_height (eti->table_model);
        break;
        
    case ARG_TABLE_X:
        eti->x1 = GTK_VALUE_INT (*arg);
        break;

    case ARG_TABLE_Y:
        eti->y1 = GTK_VALUE_INT (*arg);
        break;

    }
    eti_update (item, NULL, NULL, 0);
}

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

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);

    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);
    gdk_gc_set_foreground (eti->grid_gc, &canvas_widget->style->fg [GTK_STATE_NORMAL]);
}

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;
    
    if (GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->unrealize)
                (*GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->unrealize)(item);
}

static void
draw_cell (ETableItem *eti, GdkDrawable *drawable, int col, int row,
       int x1, int y1, int x2, int y2)
{
    gdk_draw_line (drawable, eti->grid_gc, x1, y1, x2-x1, y2-y1);
}

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 = e_table_model_row_count (eti->table_model);
    const int cols = e_table_header_count (eti->header);
    int row, col, y1, y2;
    int first_col, last_col, x_offset;
    int x1, x2;
    
    /*
     * Clear the background
     */
    gdk_draw_rectangle (
        drawable, eti->fill_gc, TRUE, 0, 0, width, height);

    /*
     * First column to draw, last column to draw
     */
    x1 = x_offset = 0;
    first_col = -1;
    last_col = 0;
    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 = x - x1;
            first_col = col;
        }
    }
    last_col = col;

    /*
     * Draw individual lines
     */
    y1 = y2 = 0;
    for (row = eti->top_item; row < rows; row++, y1 = y2){
        y2 += e_table_model_row_height (eti->table_model, row) + 1;

        if (y1 > y + height)
            break;

        if (y2 < y)
            continue;
        
        if (eti->draw_grid)
            gdk_draw_line (drawable, eti->grid_gc, 0, y - y2, width, y - y2);

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

            draw_cell (eti, drawable, col, row, x_offset, y1 - y, x_offset + ecol->width, y2);
        }
    }
}

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

    return 0.0;
}

static int
eti_event (GnomeCanvasItem *item, GdkEvent *e)
{
    return FALSE;
}
    
static void
eti_class_init (GtkObjectClass *object_class)
{
    GnomeCanvasItemClass *item_class = (GnomeCanvasItemClass *) object_class;

    eti_parent_class = gtk_type_class (PARENT_OBJECT_TYPE);
    
    object_class->destroy = eti_destroy;
    object_class->set_arg = eti_set_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;
    
    gtk_object_add_arg_type ("ETableItem::ETableHeader", GTK_TYPE_POINTER,
                 GTK_ARG_WRITABLE, ARG_TABLE_HEADER);
    gtk_object_add_arg_type ("ETableItem::ETableModel", GTK_TYPE_POINTER,
                 GTK_ARG_WRITABLE, ARG_TABLE_MODEL);
    gtk_object_add_arg_type ("ETableItem::x", GTK_TYPE_INT,
                 GTK_ARG_WRITABLE, ARG_TABLE_X);
    gtk_object_add_arg_type ("ETableItem::y", GTK_TYPE_INT,
                 GTK_ARG_WRITABLE, ARG_TABLE_Y);
}

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;
}