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/* 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 "gtkcssnumbervalueprivate.h"
#include "gtkstylepropertyprivate.h"
struct _GtkCssValue {
GTK_CSS_VALUE_BASE
GtkCssUnit unit;
double value;
};
static void
gtk_css_value_number_free (GtkCssValue *value)
{
g_slice_free (GtkCssValue, value);
}
static GtkCssValue *
gtk_css_value_number_compute (GtkCssValue *number,
guint property_id,
GtkStyleContext *context)
{
switch (number->unit)
{
default:
g_assert_not_reached();
/* fall through */
case GTK_CSS_PERCENT:
case GTK_CSS_NUMBER:
case GTK_CSS_PX:
case GTK_CSS_DEG:
case GTK_CSS_S:
return _gtk_css_value_ref (number);
case GTK_CSS_PT:
return _gtk_css_number_value_new (number->value * 96.0 / 72.0,
GTK_CSS_PX);
case GTK_CSS_PC:
return _gtk_css_number_value_new (number->value * 96.0 / 72.0 * 12.0,
GTK_CSS_PX);
break;
case GTK_CSS_IN:
return _gtk_css_number_value_new (number->value * 96.0,
GTK_CSS_PX);
break;
case GTK_CSS_CM:
return _gtk_css_number_value_new (number->value * 96.0 * 0.39370078740157477,
GTK_CSS_PX);
break;
case GTK_CSS_MM:
return _gtk_css_number_value_new (number->value * 96.0 * 0.039370078740157477,
GTK_CSS_PX);
break;
case GTK_CSS_EM:
return _gtk_css_number_value_new (number->value *
_gtk_css_number_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_FONT_SIZE), 100),
GTK_CSS_PX);
break;
case GTK_CSS_EX:
/* for now we pretend ex is half of em */
return _gtk_css_number_value_new (number->value * 0.5 *
_gtk_css_number_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_FONT_SIZE), 100),
GTK_CSS_PX);
case GTK_CSS_RAD:
return _gtk_css_number_value_new (number->value * 360.0 / (2 * G_PI),
GTK_CSS_DEG);
case GTK_CSS_GRAD:
return _gtk_css_number_value_new (number->value * 360.0 / 400.0,
GTK_CSS_DEG);
case GTK_CSS_TURN:
return _gtk_css_number_value_new (number->value * 360.0,
GTK_CSS_DEG);
case GTK_CSS_MS:
return _gtk_css_number_value_new (number->value / 1000.0,
GTK_CSS_S);
}
}
static gboolean
gtk_css_value_number_equal (const GtkCssValue *number1,
const GtkCssValue *number2)
{
return number1->unit == number2->unit &&
number1->value == number2->value;
}
static GtkCssValue *
gtk_css_value_number_transition (GtkCssValue *start,
GtkCssValue *end,
double progress)
{
/* FIXME: This needs to be supported at least for percentages,
* but for that we kinda need to support calc(5px + 50%) */
if (start->unit != end->unit)
return NULL;
return _gtk_css_number_value_new (start->value + (end->value - start->value) * progress,
start->unit);
}
static void
gtk_css_value_number_print (const GtkCssValue *number,
GString *string)
{
char buf[G_ASCII_DTOSTR_BUF_SIZE];
const char *names[] = {
/* [GTK_CSS_NUMBER] = */ "",
/* [GTK_CSS_PERCENT] = */ "%",
/* [GTK_CSS_PX] = */ "px",
/* [GTK_CSS_PT] = */ "pt",
/* [GTK_CSS_EM] = */ "em",
/* [GTK_CSS_EX] = */ "ex",
/* [GTK_CSS_PC] = */ "pc",
/* [GTK_CSS_IN] = */ "in",
/* [GTK_CSS_CM] = */ "cm",
/* [GTK_CSS_MM] = */ "mm",
/* [GTK_CSS_RAD] = */ "rad",
/* [GTK_CSS_DEG] = */ "deg",
/* [GTK_CSS_GRAD] = */ "grad",
/* [GTK_CSS_TURN] = */ "turn",
/* [GTK_CSS_S] = */ "s",
/* [GTK_CSS_MS] = */ "ms",
};
g_ascii_dtostr (buf, sizeof (buf), number->value);
g_string_append (string, buf);
if (number->value != 0.0)
g_string_append (string, names[number->unit]);
}
static const GtkCssValueClass GTK_CSS_VALUE_NUMBER = {
gtk_css_value_number_free,
gtk_css_value_number_compute,
gtk_css_value_number_equal,
gtk_css_value_number_transition,
gtk_css_value_number_print
};
GtkCssValue *
_gtk_css_number_value_new (double value,
GtkCssUnit unit)
{
static GtkCssValue zero_singleton = { >K_CSS_VALUE_NUMBER, 1, GTK_CSS_NUMBER, 0 };
static GtkCssValue px_singletons[] = {
{ >K_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 0 },
{ >K_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 1 },
{ >K_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 2 },
{ >K_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 3 },
{ >K_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 4 },
};
GtkCssValue *result;
if (unit == GTK_CSS_NUMBER && value == 0)
return _gtk_css_value_ref (&zero_singleton);
if (unit == GTK_CSS_PX &&
(value == 0 ||
value == 1 ||
value == 2 ||
value == 3 ||
value == 4))
{
return _gtk_css_value_ref (&px_singletons[(int) value]);
}
result = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_NUMBER);
result->unit = unit;
result->value = value;
return result;
}
GtkCssUnit
_gtk_css_number_value_get_unit (const GtkCssValue *value)
{
g_return_val_if_fail (value->class == >K_CSS_VALUE_NUMBER, GTK_CSS_NUMBER);
return value->unit;
}
double
_gtk_css_number_value_get (const GtkCssValue *number,
double one_hundred_percent)
{
g_return_val_if_fail (number != NULL, 0.0);
g_return_val_if_fail (number->class == >K_CSS_VALUE_NUMBER, 0.0);
if (number->unit == GTK_CSS_PERCENT)
return number->value * one_hundred_percent / 100;
else
return number->value;
}
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