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/* GTK - The GIMP Toolkit
* Copyright (C) 2021 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 "gtkcsslineheightvalueprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcssstyleprivate.h"
struct _GtkCssValue {
GTK_CSS_VALUE_BASE
GtkCssValue *height;
};
static GtkCssValue *default_line_height;
static GtkCssValue *gtk_css_value_line_height_new_empty (void);
static GtkCssValue *gtk_css_value_line_height_new (GtkCssValue *height);
static void
gtk_css_value_line_height_free (GtkCssValue *value)
{
_gtk_css_value_unref (value->height);
g_slice_free (GtkCssValue, value);
}
static GtkCssValue *
gtk_css_value_line_height_compute (GtkCssValue *value,
guint property_id,
GtkStyleProvider *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
GtkCssValue *height;
height = _gtk_css_value_compute (value->height, property_id, provider, style, parent_style);
if (gtk_css_number_value_get_dimension (height) == GTK_CSS_DIMENSION_PERCENTAGE)
{
double factor;
GtkCssValue *val;
GtkCssValue *computed;
factor = _gtk_css_number_value_get (height, 1);
val = gtk_css_dimension_value_new (factor, GTK_CSS_EM);
computed = _gtk_css_value_compute (val,
GTK_CSS_PROPERTY_FONT_SIZE,
provider,
style,
parent_style);
_gtk_css_value_unref (val);
_gtk_css_value_unref (height);
return computed;
}
else
{
return height;
}
}
static gboolean
gtk_css_value_line_height_equal (const GtkCssValue *value1,
const GtkCssValue *value2)
{
if (value1->height == NULL || value2->height == NULL)
return FALSE;
return _gtk_css_value_equal (value1->height, value2->height);
}
static GtkCssValue *
gtk_css_value_line_height_transition (GtkCssValue *start,
GtkCssValue *end,
guint property_id,
double progress)
{
GtkCssValue *height;
if (start->height == NULL || end->height == NULL)
return NULL;
height = _gtk_css_value_transition (start->height, end->height, property_id, progress);
if (height == NULL)
return NULL;
return gtk_css_value_line_height_new (height);
}
static void
gtk_css_value_line_height_print (const GtkCssValue *value,
GString *string)
{
if (value->height == NULL)
g_string_append (string, "normal");
else
_gtk_css_value_print (value->height, string);
}
static const GtkCssValueClass GTK_CSS_VALUE_LINE_HEIGHT = {
"GtkCssLineHeightValue",
gtk_css_value_line_height_free,
gtk_css_value_line_height_compute,
gtk_css_value_line_height_equal,
gtk_css_value_line_height_transition,
NULL,
NULL,
gtk_css_value_line_height_print
};
static GtkCssValue *
gtk_css_value_line_height_new_empty (void)
{
GtkCssValue *result;
result = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_LINE_HEIGHT);
result->height = NULL;
result->is_computed = TRUE;
return result;
}
static GtkCssValue *
gtk_css_value_line_height_new (GtkCssValue *height)
{
GtkCssValue *result;
result = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_LINE_HEIGHT);
result->height = height;
return result;
}
GtkCssValue *
gtk_css_line_height_value_get_default (void)
{
if (default_line_height == NULL)
default_line_height = gtk_css_value_line_height_new_empty ();
return default_line_height;
}
GtkCssValue *
gtk_css_line_height_value_parse (GtkCssParser *parser)
{
GtkCssValue *height;
if (gtk_css_parser_try_ident (parser, "normal"))
return _gtk_css_value_ref (gtk_css_line_height_value_get_default ());
height = _gtk_css_number_value_parse (parser, GTK_CSS_PARSE_NUMBER |
GTK_CSS_PARSE_PERCENT |
GTK_CSS_PARSE_LENGTH |
GTK_CSS_POSITIVE_ONLY);
if (!height)
return NULL;
return gtk_css_value_line_height_new (height);
}
double
gtk_css_line_height_value_get (const GtkCssValue *value)
{
if (value->class == >K_CSS_VALUE_LINE_HEIGHT)
return 0.0;
return _gtk_css_number_value_get (value, 1);
}
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