path: root/widgets/misc/e-canvas-background.c

/*
 * e-canvas-background.c - background color for canvas.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Chris Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <math.h>
#include <stdio.h>
#include <string.h>

#include <gdk/gdkkeysyms.h>
#include <gtk/gtk.h>

#include <glib/gi18n.h>
#include "e-util/e-util.h"
#include "misc/e-canvas.h"
#include "misc/e-canvas-utils.h"

#include "e-canvas-background.h"

#define E_CANVAS_BACKGROUND_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_CANVAS_BACKGROUND_TYPE, ECanvasBackgroundPrivate))

/* workaround for avoiding API broken */
#define ecb_get_type e_canvas_background_get_type
G_DEFINE_TYPE (
    ECanvasBackground,
    ecb,
    GNOME_TYPE_CANVAS_ITEM)

#define d(x)

struct _ECanvasBackgroundPrivate {
    guint rgba;     /* Fill color, RGBA */
};

enum {
    STYLE_SET,
    LAST_SIGNAL
};

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

enum {
    PROP_0,
    PROP_FILL_COLOR,
    PROP_FILL_COLOR_GDK,
    PROP_FILL_COLOR_RGBA,
};

static void
ecb_bounds (GnomeCanvasItem *item,
            gdouble *x1,
            gdouble *y1,
            gdouble *x2,
            gdouble *y2)
{
    *x1 = -G_MAXDOUBLE;
    *y1 = -G_MAXDOUBLE;
    *x2 = G_MAXDOUBLE;
    *y2 = G_MAXDOUBLE;
}

static void
ecb_update (GnomeCanvasItem *item,
            const cairo_matrix_t *i2c,
            gint flags)
{
    gdouble x1, y1, x2, y2;

    x1 = item->x1;
    y1 = item->y1;
    x2 = item->x2;
    y2 = item->y2;

    /* The bounds are all constants so we should only have to
     * redraw once. */
    ecb_bounds (item, &item->x1, &item->y1, &item->x2, &item->y2);

    if (item->x1 != x1 || item->y1 != y1 ||
        item->x2 != x2 || item->y2 != y2)
        gnome_canvas_request_redraw (
            item->canvas, item->x1, item->y1, item->x2, item->y2);
}

static void
ecb_set_property (GObject *object,
                  guint property_id,
                  const GValue *value,
                  GParamSpec *pspec)
{
    ECanvasBackground *ecb;

    GdkColor color = { 0, 0, 0, 0, };
    GdkColor *pcolor;

    ecb = E_CANVAS_BACKGROUND (object);

    switch (property_id) {
    case PROP_FILL_COLOR:
        if (g_value_get_string (value))
            gdk_color_parse (g_value_get_string (value), &color);

        ecb->priv->rgba = ((color.red & 0xff00) << 16 |
                   (color.green & 0xff00) << 8 |
                   (color.blue & 0xff00) |
                   0xff);
        break;

    case PROP_FILL_COLOR_GDK:
        pcolor = g_value_get_boxed (value);
        if (pcolor) {
            color = *pcolor;
        }

        ecb->priv->rgba = ((color.red & 0xff00) << 16 |
                   (color.green & 0xff00) << 8 |
                   (color.blue & 0xff00) |
                   0xff);
        break;

    case PROP_FILL_COLOR_RGBA:
        ecb->priv->rgba = g_value_get_uint (value);
        break;

    }

    gnome_canvas_item_request_update (GNOME_CANVAS_ITEM (ecb));
}

static void
ecb_get_property (GObject *object,
                  guint property_id,
                  GValue *value,
                  GParamSpec *pspec)
{
    ECanvasBackground *ecb;

    ecb = E_CANVAS_BACKGROUND (object);

    switch (property_id) {
    case PROP_FILL_COLOR_RGBA:
        g_value_set_uint (value, ecb->priv->rgba);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
        break;
    }
}

static void
ecb_init (ECanvasBackground *ecb)
{
    ecb->priv = E_CANVAS_BACKGROUND_GET_PRIVATE (ecb);
}

static void
ecb_draw (GnomeCanvasItem *item,
          cairo_t *cr,
          gint x,
          gint y,
          gint width,
          gint height)
{
    ECanvasBackground *ecb = E_CANVAS_BACKGROUND (item);

    cairo_save (cr);
    cairo_set_source_rgba (cr,
                   ((ecb->priv->rgba >> 24) & 0xff) / 255.0,
                   ((ecb->priv->rgba >> 16) & 0xff) / 255.0,
                   ((ecb->priv->rgba >>  8) & 0xff) / 255.0,
                   ( ecb->priv->rgba        & 0xff) / 255.0);
    cairo_paint (cr);
    cairo_restore (cr);
}

static GnomeCanvasItem *
ecb_point (GnomeCanvasItem *item,
           gdouble x,
           gdouble y,
           gint cx,
           gint cy)
{
    return item;
}

static void
ecb_style_set (ECanvasBackground *ecb,
               GtkStyle *previous_style)
{
    GnomeCanvasItem *item = GNOME_CANVAS_ITEM (ecb);

    if (gtk_widget_get_realized (GTK_WIDGET (item->canvas)))
        gnome_canvas_item_request_update (GNOME_CANVAS_ITEM (ecb));
}

static void
ecb_class_init (ECanvasBackgroundClass *ecb_class)
{
    GnomeCanvasItemClass *item_class = GNOME_CANVAS_ITEM_CLASS (ecb_class);
    GObjectClass *object_class = G_OBJECT_CLASS (ecb_class);

    g_type_class_add_private (ecb_class, sizeof (ECanvasBackgroundPrivate));

    object_class->set_property  = ecb_set_property;
    object_class->get_property  = ecb_get_property;

    item_class->update          = ecb_update;
    item_class->draw            = ecb_draw;
    item_class->point           = ecb_point;
    item_class->bounds          = ecb_bounds;

    ecb_class->style_set        = ecb_style_set;

    g_object_class_install_property (object_class, PROP_FILL_COLOR,
                     g_param_spec_string ("fill_color",
                                  "Fill color",
                                  "Fill color",
                                  NULL,
                                  G_PARAM_WRITABLE));

    g_object_class_install_property (object_class, PROP_FILL_COLOR_GDK,
                     g_param_spec_boxed ("fill_color_gdk",
                                 "GDK fill color",
                                 "GDK fill color",
                                 GDK_TYPE_COLOR,
                                 G_PARAM_WRITABLE));

    g_object_class_install_property (object_class, PROP_FILL_COLOR_RGBA,
                     g_param_spec_uint ("fill_color_rgba",
                                "GDK fill color",
                                "GDK fill color",
                                0, G_MAXUINT, 0,
                                G_PARAM_READWRITE));

    ecb_signals[STYLE_SET] =
        g_signal_new ("style_set",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ECanvasBackgroundClass, style_set),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE, 1, GTK_TYPE_STYLE);
}