/usr/share/nickle/nichrome.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 Cairo;
autoimport Mutex;
namespace Nichrome {
import Cairo;
/*
* Event types
*/
public typedef enum { press, release, double, triple } button_type_t;
public typedef struct {
int time;
real x;
real y;
} pos_event_t;
public typedef pos_event_t + struct {
button_type_t type;
int button;
} button_event_t;
public typedef enum { inside, outside, entering, leaving } motion_type_t;
public typedef pos_event_t + struct {
motion_type_t type;
} motion_event_t;
public typedef enum { press, release } key_type_t;
public typedef struct {
key_type_t type;
int time;
string key;
string text;
} key_event_t;
public typedef nichrome_t;
public typedef widget_t;
public typedef container_t;
public typedef contained_t;
/*
* Containers, as seen by the toolkit
*/
public typedef void(&container_t, &contained_t) resize_handler_t;
public typedef void(&contained_t, rect_t) configure_handler_t;
public typedef struct {
resize_handler_t resize;
} container_t;
public typedef void(cairo_t cr, &widget_t widget) draw_t;
public typedef void(&widget_t, &button_event_t) button_handler_t;
public typedef void(&widget_t, &motion_event_t) motion_handler_t;
public typedef void(&widget_t, &key_event_t) key_handler_t;
public typedef void(&widget_t, bool focus) focus_handler_t;
public typedef void(&contained_t) remove_handler_t;
public typedef void(&poly object, int indent) print_handler_t;
public typedef bool(&key_event_t) global_key_handler_t;
public void do_indent (int indent) {
while (indent-- > 0)
printf(" ");
}
public typedef struct {
&container_t container;
configure_handler_t configure;
print_handler_t print;
remove_handler_t remove;
bool active;
} contained_t;
/*
* Widgets, as seen by the toolkit
*/
public typedef contained_t + struct {
&nichrome_t nichrome;
rect_t geometry;
rect_t extents;
draw_t outline;
draw_t draw;
draw_t natural;
button_handler_t button;
motion_handler_t motion;
key_handler_t key;
focus_handler_t focus;
} widget_t;
/*
* An application surface
*/
public typedef void(&nichrome_t nichrome) callback_t;
public typedef struct {
surface_t surface;
file event;
bool draw;
bool resize;
bool shown;
bool want_shown;
point_t scale;
(&widget_t)[...] widgets;
&widget_t key_focus;
&widget_t mouse_grab;
int button_down;
&widget_t mouse_in;
callback_t destroy;
callback_t configure;
cairo_t outline_cr;
&widget_t outline_widget;
bool running;
mutex drawing;
thread self;
int suspend_draw;
global_key_handler_t global_key;
} nichrome_t;
public widget_t no_widget;
public cairo_t cairo (&nichrome_t nichrome)
{
cairo_t cr = create (nichrome.surface);
scale (cr, nichrome.scale.x, nichrome.scale.y);
return cr;
}
public void add (&nichrome_t nichrome, &widget_t widget) {
&nichrome.widgets[dim(nichrome.widgets)] = &widget;
nichrome.draw = true;
}
public exception unknown_widget (&nichrome_t nichrome, &widget_t widget);
int widget_pos (&nichrome_t nichrome, &widget_t widget) {
for (int i = 0; i < dim(nichrome.widgets); i++)
if (&nichrome.widgets[i] == &widget)
return i;
raise unknown_widget (&nichrome, &widget);
}
public void remove (&nichrome_t nichrome, &widget_t widget) {
twixt (Mutex::acquire (nichrome.drawing);
Mutex::release (nichrome.drawing)) {
for (int i = widget_pos (&nichrome, &widget);
i < dim(nichrome.widgets) - 1;
i++)
{
&nichrome.widgets[i] = &nichrome.widgets[i + 1];
}
setdim (nichrome.widgets, dim(nichrome.widgets) - 1);
nichrome.draw = true;
}
}
void draw (&nichrome_t nichrome);
public void redraw (&nichrome_t nichrome) {
if (is_uninit (&nichrome.self))
return;
if (Thread::current() != nichrome.self && nichrome.suspend_draw == 0)
draw (&nichrome);
else
nichrome.draw = true;
}
public void suspend_draw(&nichrome_t nichrome) {
++nichrome.suspend_draw;
}
public void release_draw(&nichrome_t nichrome) {
assert (nichrome.suspend_draw > 0, "mismatched suspend_draw/release_draw calls");
--nichrome.suspend_draw;
if (!nichrome.running)
return;
if (nichrome.suspend_draw == 0 && nichrome.draw && Thread::current() != nichrome.self)
draw(&nichrome);
}
public void set_active(&nichrome_t nichrome, &contained_t contained, bool active) {
if (active != contained.active) {
contained.active = active;
redraw (&nichrome);
}
}
public void set_global_key(&nichrome_t nichrome, global_key_handler_t global_key) {
nichrome.global_key = global_key;
}
public namespace Widget {
protected void configure (&widget_t widget, rect_t geometry) {
widget.geometry = geometry;
}
protected void natural (cairo_t cr, &widget_t widget) = ◊;
protected void remove (&widget_t widget) {
Nichrome::remove (&widget.nichrome, &widget);
}
protected void print (&widget_t widget, int indent) {
do_indent(indent);
printf ("widget %v\n", widget.geometry);
}
protected void init (&nichrome_t nichrome, &widget_t widget) {
widget.geometry = (rect_t) {
x = 0, y = 0, width = 0, height = 0
};
widget.extents = widget.geometry;
&widget.nichrome = &nichrome;
widget.configure = configure;
widget.natural = natural;
widget.outline = natural;
widget.draw = natural;
widget.remove = remove;
widget.print = print;
widget.active = true;
Nichrome::add (&nichrome, &widget);
}
protected void redraw (&widget_t widget) {
Nichrome::redraw (&widget.nichrome);
}
protected void resize (&widget_t widget) {
if (!is_uninit (&widget.container)) {
if (widget.nichrome.drawing->owner != (mutex_owner.owner) Thread::current())
{
twixt (Mutex::acquire (widget.nichrome.drawing);
Mutex::release (widget.nichrome.drawing))
widget.container.resize (&widget.container, &widget);
} else
widget.container.resize (&widget.container, &widget);
} else
redraw (&widget);
}
protected void reoutline (&widget_t widget) {
if (&widget.nichrome.outline_widget == &widget)
&widget.nichrome.outline_widget = &no_widget;
}
protected bool in_widget (&widget_t widget, real x, real y)
{
bool in;
if (x < widget.extents.x ||
widget.extents.x + widget.extents.width <= x)
return false;
if (y < widget.extents.y ||
widget.extents.y + widget.extents.height <= y)
return false;
cairo_t cr = widget.nichrome.outline_cr;
if (&widget.nichrome.outline_widget != &widget) {
new_path (cr);
save (cr);
translate (cr, widget.geometry.x, widget.geometry.y);
widget.outline (cr, &widget);
restore (cr);
&widget.nichrome.outline_widget = &widget;
}
in = in_fill (cr, x, y);
return in;
}
protected string default_font = "sans";
protected rgba_color_t default_color = {
red = 0.6, green = 0.6,
blue = 0.6, alpha = 0.75
};
}
public *widget_t xy_to_widget (&nichrome_t nichrome, real x, real y) {
twixt (Mutex::acquire(nichrome.drawing); Mutex::release(nichrome.drawing)) {
point_t a = device_to_user (nichrome.outline_cr, (point_t) { x = x, y = y });
x = a.x; y = a.y;
for (int w = 0; w < dim (nichrome.widgets); w++) {
&widget_t widget = &nichrome.widgets[w];
if (widget.active && Widget::in_widget (&widget, x, y))
return &widget;
}
}
return &no_widget;
}
/*
* As usual, mouse grabs make this more complicated than we'd like.
*
* nichrome.mouse_in tracks the widget containing the pointer.
* nichrome.mouse_grab tracks the grabbing widget.*
* nichrome.button_down tracks which buttons are down
*
* While grabbed, events are delivered only to the grab widget.
* Otherwise, events are delivered to the containing widget.
* Pressing any button grabs the mouse.
* Releasing all buttons ungrabs the mouse. This can also
* generate an entering motion event when the ungrab
* occurs over another widget.
*/
void deliver_button (&widget_t widget, button_event_t event)
{
if (!is_uninit (&widget.button)) {
event.x -= widget.geometry.x;
event.y -= widget.geometry.y;
widget.button (&widget, &event);
}
}
void deliver_motion (&widget_t widget, motion_event_t event)
{
if (!is_uninit (&widget.motion)) {
event.x -= widget.geometry.x;
event.y -= widget.geometry.y;
widget.motion (&widget, &event);
}
}
public void dispatch_button (&nichrome_t nichrome, &button_event_t event) {
&widget_t widget;
if (&nichrome.mouse_grab != &no_widget)
&widget = &nichrome.mouse_grab;
else {
&widget = &nichrome.mouse_in;
if (&widget == &no_widget)
return;
}
enum switch (event.type) {
case press:
&nichrome.mouse_grab = &widget;
nichrome.button_down |= 1 << event.button;
break;
case release:
if (&nichrome.mouse_grab == &no_widget)
return;
break;
default:
break;
}
deliver_button (&widget, event);
if (event.type == button_type_t.release)
{
nichrome.button_down &= ~(1 << event.button);
if (nichrome.button_down == 0)
{
&nichrome.mouse_grab = &no_widget;
/*
* On ungrab, deliver an entering motion
* to the widget under the pointer
*/
if (&widget != &nichrome.mouse_in)
deliver_motion (&nichrome.mouse_in,
(motion_event_t) {
type = motion_type_t.entering,
time = event.time,
x = event.x,
y = event.y });
}
}
}
public void dispatch_motion (&nichrome_t nichrome, &motion_event_t event) {
&widget_t in = xy_to_widget (&nichrome, event.x, event.y);
if (&nichrome.mouse_grab == &no_widget) {
/*
* Without a mouse grab, deliver events to the containing widget
*/
if (&in != &nichrome.mouse_in) {
event.type = motion_type_t.leaving;
deliver_motion (&nichrome.mouse_in, event);
event.type = motion_type_t.entering;
} else
event.type = motion_type_t.inside;
deliver_motion (&in, event);
} else {
/*
* With mouse grab, deliver events to the grab widget
*/
if (&in != &nichrome.mouse_grab) {
if (&nichrome.mouse_in == &nichrome.mouse_grab)
event.type = motion_type_t.leaving;
else
event.type = motion_type_t.outside;
} else {
if (&nichrome.mouse_in == &nichrome.mouse_grab)
event.type = motion_type_t.inside;
else
event.type = motion_type_t.entering;
}
deliver_motion (&nichrome.mouse_grab, event);
}
&nichrome.mouse_in = ∈
}
public void dispatch_key (&nichrome_t nichrome, &key_event_t event) {
if (!is_uninit(&nichrome.global_key))
if (nichrome.global_key(&event))
return;
&widget_t widget = &nichrome.key_focus;
if (&widget != &no_widget)
if (!is_uninit (&widget.key))
widget.key (&widget, &event);
}
public void set_key_focus (&nichrome_t nichrome, &widget_t widget) {
if (&widget != &nichrome.key_focus) {
if (!is_uninit (&nichrome.key_focus))
if (!is_uninit(&nichrome.key_focus.focus))
nichrome.key_focus.focus(&nichrome.key_focus, false);
&nichrome.key_focus = &widget;
if (&widget != &no_widget)
if (!is_uninit(&widget.focus))
widget.focus(&widget, true);
}
}
string hex_utf8 (int[...] bytes)
{
string s = "";
for (int i = 0; i < dim (bytes); i++) {
int first = bytes[i];
int c;
int extra = 0;
if ((first & 0x80) == 0) {
c = first;
} else if ((first & 0xc0) != 0xc0) {
c = first;
} else {
int mask = 0x40;
while ((first & mask) != 0)
{
extra++;
mask >>= 1;
}
c = first & (mask - 1);
while (i < dim (bytes) && extra-- > 0)
c = c << 6 | (bytes[i++] & 0x3f);
}
s += String::new (c);
}
return s;
}
void draw (&nichrome_t nichrome) {
if (Mutex::owner(nichrome.drawing) == (mutex_owner.owner) Thread::current()) {
nichrome.draw = true;
return;
}
twixt (Mutex::acquire (nichrome.drawing);
Mutex::release (nichrome.drawing))
{
if (nichrome.shown != nichrome.want_shown) {
Cairo::Surface::set_window_shown(nichrome.surface, nichrome.want_shown);
nichrome.shown = nichrome.want_shown;
}
if (!nichrome.shown)
return;
if (nichrome.resize) {
nichrome.resize = false;
Cairo::destroy (nichrome.outline_cr);
nichrome.outline_cr = cairo (&nichrome);
&nichrome.outline_widget = &no_widget;
if (!is_uninit (&nichrome.configure))
nichrome.configure (&nichrome);
}
nichrome.draw = false;
cairo_t cr = cairo (&nichrome);
int i;
disable (cr);
set_source_rgba (cr, 1, 1, 1, 1);
paint (cr);
for (i = dim (nichrome.widgets) - 1; i >= 0; i--)
{
&widget_t widget = &nichrome.widgets[i];
if (!widget.active)
continue;
if (!is_uninit (&widget.draw)) {
save (cr);
translate (cr, widget.geometry.x, widget.geometry.y);
widget.draw (cr, &widget);
restore (cr);
if (status (cr) != status_t.SUCCESS)
printf ("draw status %g for %g\n",
status (cr), &widget);
}
if (!is_uninit (&widget.outline)) {
save (cr);
translate (cr, widget.geometry.x, widget.geometry.y);
widget.outline (cr, &widget);
restore (cr);
widget.extents = fill_extents (cr);
new_path (cr);
if (status (cr) != status_t.SUCCESS)
printf ("draw status %g for %g\n",
status (cr), &widget);
}
}
enable (cr);
destroy (cr);
}
}
public void show (&nichrome_t nichrome) {
nichrome.want_shown = true;
if (!nichrome.shown)
redraw(&nichrome);
}
public void hide (&nichrome_t nichrome) {
if (nichrome.shown)
Cairo::Surface::set_window_shown(nichrome.surface, false);
nichrome.shown = nichrome.want_shown = false;
}
public void destroy (&nichrome_t nichrome) {
Cairo::Surface::destroy (nichrome.surface);
nichrome.running = false;
}
public *nichrome_t new (string name, real size ...) {
nichrome_t nichrome;
real width, height;
switch (dim (size)) {
case 0: width = height = 300; break;
case 1: width = height = size[0]; break;
default: width = size[0], height = size[1]; break;
}
nichrome.surface = Cairo::Surface::create_window_hidden (name, width, height);
nichrome.event = Cairo::Surface::open_event (nichrome.surface);
nichrome.draw = false;
nichrome.resize = true;
nichrome.shown = false;
nichrome.want_shown = true;
nichrome.running = false;
nichrome.widgets = ((&widget_t)[...]) {};
nichrome.scale = (point_t) { x = 1, y = 1 };
nichrome.destroy = destroy;
&nichrome.key_focus = &no_widget;
&nichrome.mouse_grab = &no_widget;
nichrome.button_down = 0;
&nichrome.mouse_in = &no_widget;
&nichrome.outline_widget = &no_widget;
nichrome.outline_cr = cairo (&nichrome);
nichrome.drawing = Mutex::new ();
nichrome.suspend_draw = 0;
return &nichrome;
}
public void resize (&nichrome_t nichrome, real width, real height) {
Cairo::Surface::resize_window(nichrome.surface, max(1, floor(width)), max(1, floor(height)));
}
public void top (&nichrome_t nichrome, &widget_t widget) {
for (int i = widget_pos (&nichrome, &widget);
i > 0;
i--)
{
&nichrome.widgets[i] = &nichrome.widgets[i-1];
}
&nichrome.widgets[0] = &widget;
nichrome.draw = true;
}
public void main_loop (&nichrome_t nichrome) {
nichrome.running = true;
nichrome.draw = true;
nichrome.self = Thread::current ();
string event_line;
semaphore has_event = Semaphore::new(0);
semaphore read_event = Semaphore::new(0);
void event_reader () {
for (;;) {
event_line = File::fgets (nichrome.event);
Semaphore::signal (has_event);
Semaphore::wait (read_event);
}
}
thread event_thread = fork event_reader ();
while (nichrome.running) {
if (nichrome.draw)
if (Semaphore::count (has_event) == 0)
draw (&nichrome);
Semaphore::wait (has_event);
string line = event_line;
Semaphore::signal (read_event);
file l = File::string_read (line);
File::fscanf (l, "%d %s", &(int time), &(string name));
switch (name) {
case "press":
case "release":
case "double-press":
case "triple-press":
File::fscanf (l, "%d %g %g", &(int button),
&(real x), &(real y));
button_event_t bev = {
type = ((button_type_t[string]) {
"press" => button_type_t.press,
"release" => button_type_t.release,
"double-press" => button_type_t.double,
"triple-press" => button_type_t.triple }) [name],
time = time,
button = button,
x = x,
y = y };
dispatch_button (&nichrome, &bev);
break;
case "motion":
File::fscanf (l, "%g %g", &(real x), &(real y));
motion_event_t mev = {
type = motion_type_t.inside,
time = time,
x = x,
y = y };
dispatch_motion (&nichrome, &mev);
break;
case "key-down":
case "key-up":
File::fscanf (l, "%s", &(string keyname));
int[...] bytes = {};
while (File::fscanf (l, "%x", &(int byte)) == 1)
bytes[dim(bytes)] = byte;
string s = hex_utf8(bytes);
key_event_t kev = {
type = (key_type_t[string]) {
"key-down" => key_type_t.press,
"key-up" => key_type_t.release } [name],
time = time,
key = keyname,
text = s };
dispatch_key (&nichrome, &kev);
break;
case "delete":
nichrome.destroy (&nichrome);
break;
case "configure":
nichrome.resize = true;
nichrome.draw = true;
break;
}
}
Thread::kill (event_thread);
}
string preferences_file = ".nichromerc";
public void load_preferences () {
string home = Environ::get ("HOME");
if (home[String::length(home) - 1] != '/')
home += "/";
try {
Command::lex_file (home + preferences_file);
} catch File::open_error (string error_name,
File::error_type error,
string name)
{
if (error != File::error_type.NOENT)
raise File::open_error (error_name, error, name);
}
}
}
Nichrome::load_preferences ();
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