/usr/share/nickle/nichrome-scrollbar.5c is in cairo-5c 1.10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright © 2008 Keith Packard
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is Keith Packard
*
* Contributor(s):
* Keith Packard <keithp@keithp.com>
*/
autoload Nichrome;
autoload Nichrome::Lozenge;
extend namespace Nichrome {
public namespace Scrollbar {
protected typedef void (&widget_t widget) callback_t;
protected typedef enum { horizontal, vertical } dir_t;
protected typedef union {
void up;
void above;
real drag;
real pos;
void below;
void down;
} action_t;
protected typedef union {
void up;
struct {
real delta;
} drag;
} state_t;
protected typedef void (&widget_t widget, action_t action) callback_t;
public typedef widget_t + struct {
dir_t dir;
real thickness;
real pos, size;
callback_t callback;
rgba_color_t color;
state_t state;
} scrollbar_t;
protected void natural (cairo_t cr, &scrollbar_t scrollbar) {
real w, h;
if (scrollbar.dir == dir_t.horizontal) {
w = 1;
h = scrollbar.thickness;
}
if (scrollbar.dir == dir_t.vertical) {
w = scrollbar.thickness;
h = 1;
}
rectangle (cr, 0, 0, w, h);
}
protected void outline (cairo_t cr, &scrollbar_t scrollbar) {
rectangle (cr, 0, 0, scrollbar.geometry.width,
scrollbar.geometry.height);
}
public void draw (cairo_t cr, &scrollbar_t scrollbar) {
real x, y, w, h;
real left = scrollbar.pos;
real right = left + scrollbar.size;
int highlight;
enum switch (scrollbar.dir) {
case horizontal:
x = left * scrollbar.geometry.width;
w = right * scrollbar.geometry.width - x;
y = 0;
h = scrollbar.geometry.height;
highlight = -floor (h/10 + 0.5);
break;
case vertical:
x = 0;
w = scrollbar.geometry.width;
y = left * scrollbar.geometry.height;
h = right * scrollbar.geometry.height - y;
highlight = -floor (w/10 + 0.5);
break;
}
save (cr);
union switch (scrollbar.state) {
case drag:
highlight = -highlight;
break;
default:
break;
}
translate (cr, floor (x + 0.5), floor (y + 0.5));
Lozenge::draw (cr, floor (w + 0.5), floor (h + 0.5),
scrollbar.color, highlight);
restore (cr);
}
real bound_pos (real pos, real size) = max (min (pos, 1-size), 0);
real event_pos (&scrollbar_t widget, &pos_event_t event)
{
real pos;
enum switch (widget.dir) {
case horizontal:
pos = event.x / widget.geometry.width;
break;
case vertical:
pos = event.y / widget.geometry.height;
break;
}
return bound_pos (pos, 0);
}
protected void set (&scrollbar_t widget, real pos, real size) {
size = bound_pos (size, 0);
pos = bound_pos (pos, size);
if (pos != widget.pos || size != widget.size) {
widget.pos = pos;
widget.size = size;
Widget::redraw (&widget);
}
}
real drag_pos (&scrollbar_t widget, real pos) {
pos = pos - widget.state.drag.delta;
return bound_pos (pos, widget.size);
}
protected void button (&scrollbar_t widget, &button_event_t event) {
enum switch (event.type) {
case press:
if (event.button > 3)
break;
real pos = event_pos (&widget, &event);
widget.state = (state_t) { drag = { delta = pos - widget.pos }};
Widget::redraw (&widget);
break;
case release:
if (event.button > 3)
break;
real pos = drag_pos (&widget, event_pos (&widget, &event));
widget.state = state_t.up;
widget.pos = pos;
widget.callback (&widget, (action_t) { pos = pos });
Widget::redraw (&widget);
break;
default:
break;
}
}
protected void motion (&scrollbar_t widget, &motion_event_t event) {
union switch (widget.state) {
case drag:
real pos = drag_pos (&widget, event_pos (&widget, &event));
widget.pos = pos;
widget.callback (&widget, (action_t) { drag = pos });
Widget::redraw (&widget);
break;
default:
break;
}
}
public void init (&scrollbar_t widget,
&nichrome_t nichrome,
dir_t dir,
callback_t callback) {
Widget::init (&nichrome, &widget);
widget.draw = draw;
widget.button = button;
widget.motion = motion;
widget.callback = callback;
widget.outline = outline;
widget.natural = natural;
widget.state = state_t.up;
widget.color = Widget::default_color;
widget.dir = dir;
widget.pos = 0;
widget.size = .1;
widget.thickness = 10;
}
public *widget_t new (&nichrome_t nichrome,
dir_t dir,
callback_t callback) {
scrollbar_t widget;
init (&widget, &nichrome, dir, callback);
return &widget;
}
}
}
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