gtk2/gtk/gtkcsspalettevalue.c
Benjamin Otte 3322599e99 css: Introduce the idea of dynamic values
Dynamic values are values that change their contents with the current
(monotonic) time.

This just introduces the GtkCssValue API for it.
2018-03-16 06:04:43 +01:00

262 lines
7.2 KiB
C

/* GTK - The GIMP Toolkit
* Copyright (C) 2011 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtkcsspalettevalueprivate.h"
#include "gtkcssiconthemevalueprivate.h"
#include "gtkcsscolorvalueprivate.h"
#include "gtkcssrgbavalueprivate.h"
struct _GtkCssValue {
GTK_CSS_VALUE_BASE
GHashTable *colors;
};
static GtkCssValue *default_palette;
static GtkCssValue *gtk_css_palette_value_new_empty (void);
static void
gtk_css_palette_value_add_color (GtkCssValue *value,
const char *name,
GtkCssValue *color)
{
g_hash_table_insert (value->colors, g_strdup (name), color);
}
static void
gtk_css_value_palette_free (GtkCssValue *value)
{
g_hash_table_unref (value->colors);
g_slice_free (GtkCssValue, value);
}
static GtkCssValue *
gtk_css_value_palette_compute (GtkCssValue *specified,
guint property_id,
GtkStyleProvider *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
GHashTableIter iter;
gpointer name, value;
GtkCssValue *computed_color;
GtkCssValue *result;
gboolean changes = FALSE;
result = gtk_css_palette_value_new_empty ();
g_hash_table_iter_init (&iter, specified->colors);
while (g_hash_table_iter_next (&iter, &name, &value))
{
computed_color = _gtk_css_value_compute (value, property_id, provider, style, parent_style);
changes |= computed_color != value;
gtk_css_palette_value_add_color (result, name, computed_color);
}
if (!changes)
{
_gtk_css_value_unref (result);
result = _gtk_css_value_ref (specified);
}
return result;
}
static gboolean
gtk_css_value_palette_equal (const GtkCssValue *value1,
const GtkCssValue *value2)
{
gpointer name, color1, color2;
GHashTableIter iter;
if (g_hash_table_size (value1->colors) != g_hash_table_size (value2->colors))
return FALSE;
g_hash_table_iter_init (&iter, value1->colors);
while (g_hash_table_iter_next (&iter, &name, &color1))
{
color2 = g_hash_table_lookup (value2->colors, name);
if (color2 == NULL)
return FALSE;
if (!_gtk_css_value_equal (color1, color2))
return FALSE;
}
return TRUE;
}
static GtkCssValue *
gtk_css_value_palette_transition (GtkCssValue *start,
GtkCssValue *end,
guint property_id,
double progress)
{
gpointer name, start_color, end_color;
GHashTableIter iter;
GtkCssValue *result, *transition;
/* XXX: For colors that are only in start or end but not both,
* we don't transition but just keep the value.
* That causes an abrupt transition to currentColor at the end.
*/
result = gtk_css_palette_value_new_empty ();
g_hash_table_iter_init (&iter, start->colors);
while (g_hash_table_iter_next (&iter, &name, &start_color))
{
end_color = g_hash_table_lookup (end->colors, name);
if (end_color == NULL)
transition = _gtk_css_value_ref (start_color);
else
transition = _gtk_css_value_transition (start_color, end_color, property_id, progress);
gtk_css_palette_value_add_color (result, name, transition);
}
g_hash_table_iter_init (&iter, end->colors);
while (g_hash_table_iter_next (&iter, &name, &end_color))
{
start_color = g_hash_table_lookup (start->colors, name);
if (start_color != NULL)
continue;
gtk_css_palette_value_add_color (result, name, _gtk_css_value_ref (end_color));
}
return result;
}
static void
gtk_css_value_palette_print (const GtkCssValue *value,
GString *string)
{
GHashTableIter iter;
gpointer name, color;
gboolean first = TRUE;
if (value == default_palette)
{
g_string_append (string, "default");
return;
}
g_hash_table_iter_init (&iter, value->colors);
while (g_hash_table_iter_next (&iter, &name, &color))
{
if (first)
first = FALSE;
else
g_string_append (string, ", ");
g_string_append (string, name);
g_string_append_c (string, ' ');
_gtk_css_value_print (color, string);
}
}
static const GtkCssValueClass GTK_CSS_VALUE_PALETTE = {
gtk_css_value_palette_free,
gtk_css_value_palette_compute,
gtk_css_value_palette_equal,
gtk_css_value_palette_transition,
NULL,
NULL,
gtk_css_value_palette_print
};
static GtkCssValue *
gtk_css_palette_value_new_empty (void)
{
GtkCssValue *result;
result = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_PALETTE);
result->colors = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free,
(GDestroyNotify) _gtk_css_value_unref);
return result;
}
GtkCssValue *
gtk_css_palette_value_new_default (void)
{
if (default_palette == NULL)
{
default_palette = gtk_css_palette_value_new_empty ();
gtk_css_palette_value_add_color (default_palette, "error", _gtk_css_color_value_new_name ("error_color"));
gtk_css_palette_value_add_color (default_palette, "warning", _gtk_css_color_value_new_name ("warning_color"));
gtk_css_palette_value_add_color (default_palette, "success", _gtk_css_color_value_new_name ("success_color"));
}
return _gtk_css_value_ref (default_palette);
}
GtkCssValue *
gtk_css_palette_value_parse (GtkCssParser *parser)
{
GtkCssValue *result, *color;
char *ident;
if (_gtk_css_parser_try (parser, "default", TRUE))
return gtk_css_palette_value_new_default ();
result = gtk_css_palette_value_new_empty ();
do {
ident = _gtk_css_parser_try_ident (parser, TRUE);
if (ident == NULL)
{
_gtk_css_parser_error (parser, "expected color name");
_gtk_css_value_unref (result);
return NULL;
}
color = _gtk_css_color_value_parse (parser);
if (color == NULL)
{
g_free (ident);
_gtk_css_value_unref (result);
return NULL;
}
gtk_css_palette_value_add_color (result, ident, color);
g_free (ident);
} while (_gtk_css_parser_try (parser, ",", TRUE));
return result;
}
const GdkRGBA *
gtk_css_palette_value_get_color (GtkCssValue *value,
const char *name)
{
GtkCssValue *color;
g_return_val_if_fail (value->class == &GTK_CSS_VALUE_PALETTE, NULL);
color = g_hash_table_lookup (value->colors, name);
if (color == NULL)
return NULL;
return _gtk_css_rgba_value_get_rgba (color);
}