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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*-
nautilus-background.c: Object for the background of a widget.
Copyright (C) 2000 Eazel, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
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
General Public License for more details.
You should have received a copy of the GNU General Public
License along with this program; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Author: Darin Adler <darin@eazel.com>
*/
#include <config.h>
#include "nautilus-background-canvas-group.h"
#include <libgnomeui/gnome-canvas.h>
#include <libgnomeui/gnome-canvas-util.h>
#include <libart_lgpl/art_rgb_affine.h>
#include <libart_lgpl/art_rgb_rgba_affine.h>
#include "nautilus-background.h"
#include "nautilus-gdk-extensions.h"
#include "nautilus-gtk-macros.h"
static void nautilus_background_canvas_group_initialize_class (gpointer klass);
static void nautilus_background_canvas_group_initialize (gpointer object,
gpointer klass);
static void nautilus_background_canvas_group_draw (GnomeCanvasItem *item,
GdkDrawable *drawable,
int x,
int y,
int width,
int height);
static void nautilus_background_canvas_group_render (GnomeCanvasItem *item,
GnomeCanvasBuf *buffer);
NAUTILUS_DEFINE_CLASS_BOILERPLATE (NautilusBackgroundCanvasGroup, nautilus_background_canvas_group, GNOME_TYPE_CANVAS_GROUP)
static void
nautilus_background_canvas_group_initialize_class (gpointer klass)
{
GNOME_CANVAS_ITEM_CLASS (klass)->draw = nautilus_background_canvas_group_draw;
GNOME_CANVAS_ITEM_CLASS (klass)->render = nautilus_background_canvas_group_render;
}
static void
nautilus_background_canvas_group_initialize (gpointer object, gpointer klass)
{
}
static void
nautilus_background_canvas_group_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
int drawable_corner_x, int drawable_corner_y,
int drawable_width, int drawable_height)
{
NautilusBackground *background;
GdkGC *gc;
GdkRectangle rectangle;
/* Draw the background. */
background = nautilus_get_widget_background (GTK_WIDGET (item->canvas));
/* If GtkStyle handled it, then we don't want to bother doing
* any additional work. It would be way slow to draw again.
*/
if (nautilus_background_is_too_complex_for_gtk_style (background)) {
/* Create a new gc each time.
* If this is a speed problem, we can create one and keep it around,
* but it's a bit more complicated to ensure that it's always compatible
* with whatever drawable is passed in.
*/
gc = gdk_gc_new (drawable);
/* The rectangle is the size of the entire viewed area
* of the canvas. The corner is determined by the
* current scroll position of the GtkLayout, and the
* size is determined by the current size of the
* widget. Since 0,0 is the corner of the drawable,
* we need to offset the rectangle so it's relative to
* the drawable's coordinates.
*/
rectangle.x = GTK_LAYOUT (item->canvas)->xoffset - drawable_corner_x;
rectangle.y = GTK_LAYOUT (item->canvas)->yoffset - drawable_corner_y;
rectangle.width = GTK_WIDGET (item->canvas)->allocation.width;
rectangle.height = GTK_WIDGET (item->canvas)->allocation.height;
nautilus_background_draw (background, drawable, gc, &rectangle,
-drawable_corner_x, -drawable_corner_y);
gdk_gc_unref (gc);
}
/* Call through to the GnomeCanvasGroup implementation, which
* will draw all the canvas items.
*/
NAUTILUS_CALL_PARENT_CLASS (GNOME_CANVAS_ITEM_CLASS, draw,
(item, drawable,
drawable_corner_x, drawable_corner_y,
drawable_width, drawable_height));
}
/* draw the background for the anti-aliased canvas case */
static void
nautilus_background_canvas_group_render (GnomeCanvasItem *item, GnomeCanvasBuf *buffer)
{
NautilusBackground *background;
background = nautilus_get_widget_background (GTK_WIDGET (item->canvas));
if (background != NULL) {
nautilus_background_draw_aa (background,
buffer,
GTK_WIDGET (item->canvas)->allocation.width,
GTK_WIDGET (item->canvas)->allocation.height);
}
/* Call through to the GnomeCanvasGroup implementation, which will draw all
* the canvas items.
*/
NAUTILUS_CALL_PARENT_CLASS (GNOME_CANVAS_ITEM_CLASS, render, (item, buffer));
}
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