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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;
extend namespace Nichrome {
public namespace Label {
public typedef void (&widget_t widget) callback_t;
public typedef enum {
left, center, right
} justify_t;
public typedef widget_t + struct {
string label;
string font;
rgba_color_t color;
justify_t justify;
} label_t;
typedef struct {
real x, y;
real pad;
real width, height;
real preferred_width, preferred_height;
} metrics_t;
metrics_t get_metrics (cr, &label_t widget) {
set_font (cr, widget.font);
text_extents_t text = text_extents (cr, widget.label);
text_extents_t m = text_extents (cr, "M");
text_extents_t x = text_extents (cr, "x");
font_extents_t font = font_extents(cr);
metrics_t metrics;
real pad = m.height / 2;
metrics.pad = pad;
metrics.preferred_width = pad + text.width + pad;
metrics.preferred_height = pad + m.height + pad;
metrics.width = max (widget.geometry.width, metrics.preferred_width);
metrics.height = max (widget.geometry.height, metrics.preferred_height);
real text_height = (x.height + m.height) / 2;
real text_bearing = (x.y_bearing + m.y_bearing) / 2;
metrics.y = floor ((metrics.height - text_height) / 2
- text_bearing + 0.5);
enum switch (widget.justify) {
case left:
metrics.x = text.x_bearing;
break;
case center:
metrics.x = floor ((metrics.width - text.width) / 2
- text.x_bearing + 0.5);
break;
case right:
metrics.x = metrics.width - text.width - text.x_bearing;
break;
}
return metrics;
}
public void natural (cairo_t cr, &label_t widget) {
metrics_t metrics = get_metrics (cr, &widget);
rectangle (cr, 0, 0, metrics.preferred_width, metrics.preferred_height);
}
public void outline (cairo_t cr, &label_t widget) {
metrics_t metrics = get_metrics (cr, &widget);
rectangle (cr, 0, 0, 0, 0);
}
public void draw (cairo_t cr, &label_t widget) {
metrics_t metrics = get_metrics (cr, &widget);
move_to (cr, metrics.x, metrics.y);
set_source_rgba (cr, widget.color.red, widget.color.green,
widget.color.blue, widget.color.alpha);
show_text (cr, widget.label);
}
public void relabel (&label_t widget, string label) {
widget.label = label;
Widget::resize (&widget);
}
protected void print (&label_t widget, int indent) {
do_indent(indent);
printf("label %s %v\n", widget.label, widget.geometry);
}
public void init (&label_t widget, &nichrome_t nichrome, string label) {
Widget::init (&nichrome, &widget);
widget.label = label;
widget.font = Widget::default_font;
widget.justify = justify_t.center;
widget.draw = draw;
widget.outline = outline;
widget.natural = natural;
widget.color = (rgba_color_t) {
red = 0, green = 0, blue = 0, alpha = 1
};
widget.print = print;
}
public *widget_t new (&nichrome_t nichrome,
string label) {
label_t widget;
init (&widget, &nichrome, label);
return &widget;
}
}
}
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