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/*
*
* 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 "e-canvas-utils.h"
void
e_canvas_item_move_absolute (GnomeCanvasItem *item, gdouble dx, gdouble dy)
{
cairo_matrix_t translate;
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
cairo_matrix_init_translate (&translate, dx, dy);
gnome_canvas_item_set_matrix (item, &translate);
}
static double
compute_offset (gint top, gint bottom, gint page_top, gint page_bottom)
{
gint size = bottom - top;
gint offset = 0;
if (top <= page_top && bottom >= page_bottom)
return 0;
if (bottom > page_bottom)
offset = (bottom - page_bottom);
if (top < page_top + offset)
offset = (top - page_top);
if (top <= page_top + offset && bottom >= page_bottom + offset)
return offset;
if (top < page_top + size * 3 / 2 + offset)
offset = top - (page_top + size * 3 / 2);
if (bottom > page_bottom - size * 3 / 2 + offset)
offset = bottom - (page_bottom - size * 3 / 2);
if (top < page_top + size * 3 / 2 + offset)
offset = top - ((page_top + page_bottom - (bottom - top)) / 2);
return offset;
}
static void
e_canvas_show_area (GnomeCanvas *canvas, gdouble x1, gdouble y1, gdouble x2, gdouble y2)
{
GtkAdjustment *h, *v;
gint dx = 0, dy = 0;
gdouble page_size;
gdouble lower;
gdouble upper;
gdouble value;
g_return_if_fail (canvas != NULL);
g_return_if_fail (GNOME_IS_CANVAS (canvas));
h = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (canvas));
page_size = gtk_adjustment_get_page_size (h);
lower = gtk_adjustment_get_lower (h);
upper = gtk_adjustment_get_upper (h);
value = gtk_adjustment_get_value (h);
dx = compute_offset (x1, x2, value, value + page_size);
if (dx)
gtk_adjustment_set_value (h, CLAMP (value + dx, lower, upper - page_size));
v = gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (canvas));
page_size = gtk_adjustment_get_page_size (v);
lower = gtk_adjustment_get_lower (v);
upper = gtk_adjustment_get_upper (v);
value = gtk_adjustment_get_value (v);
dy = compute_offset (y1, y2, value, value + page_size);
if (dy)
gtk_adjustment_set_value (v, CLAMP (value + dy, lower, upper - page_size));
}
void
e_canvas_item_show_area (GnomeCanvasItem *item, gdouble x1, gdouble y1, gdouble x2, gdouble y2)
{
g_return_if_fail (item != NULL);
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
gnome_canvas_item_i2w (item, &x1, &y1);
gnome_canvas_item_i2w (item, &x2, &y2);
e_canvas_show_area (item->canvas, x1, y1, x2, y2);
}
static gboolean
e_canvas_area_shown (GnomeCanvas *canvas, gdouble x1, gdouble y1, gdouble x2, gdouble y2)
{
GtkAdjustment *h, *v;
gint dx = 0, dy = 0;
gdouble page_size;
gdouble lower;
gdouble upper;
gdouble value;
g_return_val_if_fail (canvas != NULL, FALSE);
g_return_val_if_fail (GNOME_IS_CANVAS (canvas), FALSE);
h = gtk_scrollable_get_hadjustment (GTK_SCROLLABLE (canvas));
page_size = gtk_adjustment_get_page_size (h);
lower = gtk_adjustment_get_lower (h);
upper = gtk_adjustment_get_upper (h);
value = gtk_adjustment_get_value (h);
dx = compute_offset (x1, x2, value, value + page_size);
if (CLAMP (value + dx, lower, upper - page_size) - value != 0)
return FALSE;
v = gtk_scrollable_get_vadjustment (GTK_SCROLLABLE (canvas));
page_size = gtk_adjustment_get_page_size (v);
lower = gtk_adjustment_get_lower (v);
upper = gtk_adjustment_get_upper (v);
value = gtk_adjustment_get_value (v);
dy = compute_offset (y1, y2, value, value + page_size);
if (CLAMP (value + dy, lower, upper - page_size) - value != 0)
return FALSE;
return TRUE;
}
gboolean
e_canvas_item_area_shown (GnomeCanvasItem *item, gdouble x1, gdouble y1, gdouble x2, gdouble y2)
{
g_return_val_if_fail (item != NULL, FALSE);
g_return_val_if_fail (GNOME_IS_CANVAS_ITEM (item), FALSE);
gnome_canvas_item_i2w (item, &x1, &y1);
gnome_canvas_item_i2w (item, &x2, &y2);
return e_canvas_area_shown (item->canvas, x1, y1, x2, y2);
}
typedef struct {
gdouble x1;
gdouble y1;
gdouble x2;
gdouble y2;
GnomeCanvas *canvas;
} DoubsAndCanvas;
static gboolean
show_area_timeout (gpointer data)
{
DoubsAndCanvas *dac = data;
e_canvas_show_area (dac->canvas, dac->x1, dac->y1, dac->x2, dac->y2);
g_object_unref (dac->canvas);
g_free (dac);
return FALSE;
}
void
e_canvas_item_show_area_delayed (GnomeCanvasItem *item, gdouble x1, gdouble y1, gdouble x2, gdouble y2, gint delay)
{
DoubsAndCanvas *dac;
g_return_if_fail (item != NULL);
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
gnome_canvas_item_i2w (item, &x1, &y1);
gnome_canvas_item_i2w (item, &x2, &y2);
dac = g_new (DoubsAndCanvas, 1);
dac->x1 = x1;
dac->y1 = y1;
dac->x2 = x2;
dac->y2 = y2;
dac->canvas = item->canvas;
g_object_ref (item->canvas);
g_timeout_add (delay, show_area_timeout, dac);
}
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