cc505b2c67
2001-01-25 Christopher James Lahey <clahey@helixcode.com> * gal/widgets/e-canvas-utils.c (e_canvas_item_show_area): Made this function put some space around the area shown. svn path=/trunk/; revision=7820
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
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/*
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* e-canvas-utils.c
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* Copyright (C) 2000 Helix Code, Inc.
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* Author: Chris Lahey <clahey@helixcode.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "e-canvas-utils.h"
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void
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e_canvas_item_move_absolute (GnomeCanvasItem *item, double dx, double dy)
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{
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double translate[6];
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g_return_if_fail (item != NULL);
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g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
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art_affine_translate (translate, dx, dy);
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gnome_canvas_item_affine_absolute (item, translate);
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}
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static double
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compute_offset(double top, double bottom, double page_top, double page_bottom, double min, double max)
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{
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double size = bottom - top;
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double offset = 0;
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if (top <= page_top && bottom >= page_bottom)
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return CLAMP(0, min - top, max - top);
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if (bottom > page_bottom)
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offset = (bottom - page_bottom);
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if (top < page_top + offset)
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offset = (top - page_top);
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if (top <= page_top + offset && bottom >= page_bottom + offset)
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return CLAMP(offset, min - top, max - top);
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if (top < page_top + offset + size * 1.5)
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offset = top - (page_top + size * 1.5);
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if (bottom > page_bottom + offset - size * 1.5)
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offset = bottom - (page_bottom - size * 1.5);
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if (top < page_top + offset + size * 1.5)
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offset = top - ((page_top + page_bottom - (bottom - top)) / 2);
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return CLAMP(offset, min - top, max - top);
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}
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void
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e_canvas_item_show_area (GnomeCanvasItem *item, double x1, double y1, double x2, double y2)
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{
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GtkAdjustment *h, *v;
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double dx = 0, dy = 0;
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g_return_if_fail (item != NULL);
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g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
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gnome_canvas_item_i2w(item, &x1, &y1);
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gnome_canvas_item_i2w(item, &x2, &y2);
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h = gtk_layout_get_hadjustment(GTK_LAYOUT(item->canvas));
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dx = compute_offset(x1, x2, h->value, h->value + h->page_size, 0, h->upper - h->page_size);
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if (dx)
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gtk_adjustment_set_value(h, h->value + dx);
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v = gtk_layout_get_vadjustment(GTK_LAYOUT(item->canvas));
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dy = compute_offset(y1, y2, v->value, v->value + v->page_size, 0, v->upper - v->page_size);
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if (dy)
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gtk_adjustment_set_value(v, v->value + dy);
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}
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