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/*
* Copyright (C) 2012-2017 Robin Haberkorn
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
requires 2.0.20
%ctop{
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <glib/gprintf.h>
#include <gdk/gdk.h>
/*
* NOTE: These definitions are also in sciteco.h,
* but we cannot include them from a plain C file.
*/
#define IS_CTL(C) ((C) < ' ')
#define CTL_ECHO(C) ((C) | 0x40)
#define CTL_KEY_ESC 27
#define GDK_TO_PANGO_COLOR(X) \
((guint16)((X) * G_MAXUINT16))
%}
%h{
#include <gtk/gtk.h>
%}
class Gtk:Canonicalized:Label from Gtk:Label {
private PangoColor fg;
private guint16 fg_alpha;
private PangoColor bg;
private guint16 bg_alpha;
override (Gtk:Widget) void
style_updated(Gtk:Widget *widget)
{
Self *self = SELF(widget);
GtkStyleContext *style;
GdkRGBA normal_color;
PARENT_HANDLER(widget);
style = gtk_widget_get_style_context(widget);
gtk_style_context_get_color(style, GTK_STATE_NORMAL, &normal_color);
self->_priv->bg.red = GDK_TO_PANGO_COLOR(normal_color.red);
self->_priv->bg.green = GDK_TO_PANGO_COLOR(normal_color.green);
self->_priv->bg.blue = GDK_TO_PANGO_COLOR(normal_color.blue);
self->_priv->bg_alpha = GDK_TO_PANGO_COLOR(normal_color.alpha);
/*
* If Pango does not support transparent foregrounds,
* it will at least use a high-contrast foreground.
* NOTE: It would be very hard to get an appropriate background
* color even if Gtk supports it since the label itself may
* not have one but one of its parents.
* FIXME: We may want to honour the background color,
* so we can at least get decent reverse text when setting
* the background color in the CSS.
*/
self->_priv->fg.red = G_MAXUINT16 - self->_priv->bg.red;
self->_priv->fg.green = G_MAXUINT16 - self->_priv->bg.green;
self->_priv->fg.blue = G_MAXUINT16 - self->_priv->bg.blue;
/* try hard to get a transparent foreground anyway */
self->_priv->fg_alpha = G_MAXUINT16;
}
public GtkWidget *
new(const gchar *str)
{
Self *widget = GET_NEW;
self_set_text(widget, str);
return GTK_WIDGET(widget);
}
private void
add_highlight_attribs(Pango:Attr:List *attribs,
Pango:Color *fg, guint16 fg_alpha,
Pango:Color *bg, guint16 bg_alpha,
guint index, gsize len)
{
PangoAttribute *attr;
#if PANGO_VERSION_CHECK(1,38,0)
attr = pango_attr_foreground_alpha_new(fg_alpha);
attr->start_index = index;
attr->end_index = index + len;
pango_attr_list_insert(attribs, attr);
attr = pango_attr_background_alpha_new(bg_alpha);
attr->start_index = index;
attr->end_index = index + len;
pango_attr_list_insert(attribs, attr);
#endif
attr = pango_attr_foreground_new(fg->red, fg->green, fg->blue);
attr->start_index = index;
attr->end_index = index + len;
pango_attr_list_insert(attribs, attr);
attr = pango_attr_background_new(bg->red, bg->green, bg->blue);
attr->start_index = index;
attr->end_index = index + len;
pango_attr_list_insert(attribs, attr);
}
public void
parse_string(const gchar *str, gssize len,
Pango:Color *fg, guint16 fg_alpha,
Pango:Color *bg, guint16 bg_alpha,
Pango:Attr:List **attribs, gchar **text)
{
gsize text_len = 1; /* for trailing 0 */
gint index = 0;
if (len < 0)
len = strlen(str);
/*
* Approximate size of unformatted text.
*/
for (gint i = 0; i < len; i++)
text_len += IS_CTL(str[i]) ? 3 : 1;
*attribs = pango_attr_list_new();
*text = g_malloc(text_len);
while (len > 0) {
/*
* NOTE: This mapping is similar to
* View::set_presentations()
*/
switch (*str) {
case CTL_KEY_ESC:
self_add_highlight_attribs(*attribs,
fg, fg_alpha,
bg, bg_alpha,
index, 1);
(*text)[index++] = '$';
break;
case '\r':
self_add_highlight_attribs(*attribs,
fg, fg_alpha,
bg, bg_alpha,
index, 2);
(*text)[index++] = 'C';
(*text)[index++] = 'R';
break;
case '\n':
self_add_highlight_attribs(*attribs,
fg, fg_alpha,
bg, bg_alpha,
index, 2);
(*text)[index++] = 'L';
(*text)[index++] = 'F';
break;
case '\t':
self_add_highlight_attribs(*attribs,
fg, fg_alpha,
bg, bg_alpha,
index, 3);
(*text)[index++] = 'T';
(*text)[index++] = 'A';
(*text)[index++] = 'B';
break;
default:
if (IS_CTL(*str)) {
self_add_highlight_attribs(*attribs,
fg, fg_alpha,
bg, bg_alpha,
index, 2);
(*text)[index++] = '^';
(*text)[index++] = CTL_ECHO(*str);
} else {
(*text)[index++] = *str;
}
break;
}
str++;
len--;
}
/* null-terminate generated text */
(*text)[index] = '\0';
}
public void
set_text(self, const gchar *str)
{
PangoAttrList *attribs = NULL;
gchar *plaintext = NULL;
if (str)
self_parse_string(str, -1,
&self->_priv->fg, self->_priv->fg_alpha,
&self->_priv->bg, self->_priv->bg_alpha,
&attribs, &plaintext);
gtk_label_set_attributes(GTK_LABEL(self), attribs);
pango_attr_list_unref(attribs);
gtk_label_set_text(GTK_LABEL(self), plaintext);
g_free(plaintext);
}
}
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