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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* e-canvas-utils.c
* Copyright 2000, 2001, Ximian, Inc.
*
* Authors:
* Chris Lahey <clahey@ximian.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License, version 2, as published by the Free Software Foundation.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include "e-canvas-utils.h"
void
e_canvas_item_move_absolute (GnomeCanvasItem *item, double dx, double dy)
{
double translate[6];
g_return_if_fail (item != NULL);
g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
art_affine_translate (translate, dx, dy);
gnome_canvas_item_affine_absolute (item, translate);
}
static double
compute_offset(int top, int bottom, int page_top, int page_bottom)
{
int size = bottom - top;
int 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, double x1, double y1, double x2, double y2)
{
GtkAdjustment *h, *v;
int dx = 0, dy = 0;
g_return_if_fail (canvas != NULL);
g_return_if_fail (GNOME_IS_CANVAS (canvas));
h = gtk_layout_get_hadjustment(GTK_LAYOUT(canvas));
dx = compute_offset(x1, x2, h->value, h->value + h->page_size);
if (dx)
gtk_adjustment_set_value(h, CLAMP(h->value + dx, h->lower, h->upper - h->page_size));
v = gtk_layout_get_vadjustment(GTK_LAYOUT(canvas));
dy = compute_offset(y1, y2, v->value, v->value + v->page_size);
if (dy)
gtk_adjustment_set_value(v, CLAMP(v->value + dy, v->lower, v->upper - v->page_size));
}
void
e_canvas_item_show_area (GnomeCanvasItem *item, double x1, double y1, double x2, double 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, double x1, double y1, double x2, double y2)
{
GtkAdjustment *h, *v;
int dx = 0, dy = 0;
g_return_val_if_fail (canvas != NULL, FALSE);
g_return_val_if_fail (GNOME_IS_CANVAS (canvas), FALSE);
h = gtk_layout_get_hadjustment(GTK_LAYOUT(canvas));
dx = compute_offset(x1, x2, h->value, h->value + h->page_size);
if (CLAMP(h->value + dx, h->lower, h->upper - h->page_size) - h->value != 0)
return FALSE;
v = gtk_layout_get_vadjustment(GTK_LAYOUT(canvas));
dy = compute_offset(y1, y2, v->value, v->value + v->page_size);
if (CLAMP(v->value + dy, v->lower, v->upper - v->page_size) - v->value != 0)
return FALSE;
return TRUE;
}
gboolean
e_canvas_item_area_shown (GnomeCanvasItem *item, double x1, double y1, double x2, double 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 {
double x1;
double y1;
double x2;
double y2;
GnomeCanvas *canvas;
} DoubsAndCanvas;
static gboolean
show_area_timeout (gpointer data)
{
DoubsAndCanvas *dac = data;
if (!GTK_OBJECT_DESTROYED(dac->canvas))
e_canvas_show_area(dac->canvas, dac->x1, dac->y1, dac->x2, dac->y2);
gtk_object_unref(GTK_OBJECT(dac->canvas));
g_free(dac);
return FALSE;
}
void
e_canvas_item_show_area_delayed (GnomeCanvasItem *item, double x1, double y1, double x2, double 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;
gtk_object_ref(GTK_OBJECT(item->canvas));
g_timeout_add(delay, show_area_timeout, dac);
}
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