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gtk3/gtk/gtkcssnumbervalue.c
Benjamin Otte 0e2f35ed88 css: Introduce dependencies for value computations 
When values are computed, they might depend on various other values and
we need to track this so we can update the values when those other
values change. This is the first step in making that happen.

This patch does not do any dependency tracking at all, instead it uses
GTK_CSS_DEPENDS_ON_EVERYTHING as a sort of FIXME.
2012-08-28 15:42:23 +02:00

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8.7 KiB
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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 "gtkcssenumvalueprivate.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,
GtkCssDependencies *dependencies)
{
GtkBorderStyle border_style;
/* I don't like this special case being here in this generic code path, but no idea where else to put it. */
switch (property_id)
{
case GTK_CSS_PROPERTY_BORDER_TOP_WIDTH:
border_style = _gtk_css_border_style_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BORDER_TOP_STYLE));
if (border_style == GTK_BORDER_STYLE_NONE || border_style == GTK_BORDER_STYLE_HIDDEN)
return _gtk_css_number_value_new (0, GTK_CSS_PX);
break;
case GTK_CSS_PROPERTY_BORDER_RIGHT_WIDTH:
border_style = _gtk_css_border_style_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BORDER_RIGHT_STYLE));
if (border_style == GTK_BORDER_STYLE_NONE || border_style == GTK_BORDER_STYLE_HIDDEN)
return _gtk_css_number_value_new (0, GTK_CSS_PX);
break;
case GTK_CSS_PROPERTY_BORDER_BOTTOM_WIDTH:
border_style = _gtk_css_border_style_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BORDER_BOTTOM_STYLE));
if (border_style == GTK_BORDER_STYLE_NONE || border_style == GTK_BORDER_STYLE_HIDDEN)
return _gtk_css_number_value_new (0, GTK_CSS_PX);
break;
case GTK_CSS_PROPERTY_BORDER_LEFT_WIDTH:
border_style = _gtk_css_border_style_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BORDER_LEFT_STYLE));
if (border_style == GTK_BORDER_STYLE_NONE || border_style == GTK_BORDER_STYLE_HIDDEN)
return _gtk_css_number_value_new (0, GTK_CSS_PX);
break;
case GTK_CSS_PROPERTY_OUTLINE_WIDTH:
border_style = _gtk_css_border_style_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_OUTLINE_STYLE));
if (border_style == GTK_BORDER_STYLE_NONE || border_style == GTK_BORDER_STYLE_HIDDEN)
return _gtk_css_number_value_new (0, GTK_CSS_PX);
break;
default:
break;
}
*dependencies = GTK_CSS_DEPENDS_ON_EVERYTHING;
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 = { &GTK_CSS_VALUE_NUMBER, 1, GTK_CSS_NUMBER, 0 };
static GtkCssValue px_singletons[] = {
{ &GTK_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 0 },
{ &GTK_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 1 },
{ &GTK_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 2 },
{ &GTK_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 3 },
{ &GTK_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, &GTK_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 == &GTK_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 == &GTK_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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