forked from AuroraMiddleware/gtk
af2c40bd54
We need to be able to compute different GtkCssImage values depending on the scale, and we need this at compute time so that we don't need to read any images other than the scale in used (to e.g. calculate the image size). GtkStyleProviderPrivate is shared for all style contexts, so its not right.
247 lines
8.2 KiB
C
247 lines
8.2 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2011 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gtkcssnumbervalueprivate.h"
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#include "gtkcssenumvalueprivate.h"
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#include "gtkcssinitialvalueprivate.h"
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#include "gtkstylepropertyprivate.h"
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struct _GtkCssValue {
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GTK_CSS_VALUE_BASE
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GtkCssUnit unit;
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double value;
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};
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static void
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gtk_css_value_number_free (GtkCssValue *value)
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{
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g_slice_free (GtkCssValue, value);
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}
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static double
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get_base_font_size (guint property_id,
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GtkStyleProviderPrivate *provider,
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GtkCssComputedValues *values,
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GtkCssComputedValues *parent_values,
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GtkCssDependencies *dependencies)
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{
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if (property_id == GTK_CSS_PROPERTY_FONT_SIZE)
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{
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*dependencies = GTK_CSS_DEPENDS_ON_PARENT;
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if (parent_values)
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return _gtk_css_number_value_get (_gtk_css_computed_values_get_value (parent_values, GTK_CSS_PROPERTY_FONT_SIZE), 100);
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else
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return _gtk_css_font_size_get_default (provider);
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}
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*dependencies = GTK_CSS_DEPENDS_ON_FONT_SIZE;
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return _gtk_css_number_value_get (_gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_FONT_SIZE), 100);
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}
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static GtkCssValue *
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gtk_css_value_number_compute (GtkCssValue *number,
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guint property_id,
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GtkStyleProviderPrivate *provider,
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int scale,
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GtkCssComputedValues *values,
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GtkCssComputedValues *parent_values,
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GtkCssDependencies *dependencies)
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{
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switch (number->unit)
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{
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default:
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g_assert_not_reached();
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/* fall through */
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case GTK_CSS_PERCENT:
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/* percentages for font sizes are computed, other percentages aren't */
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if (property_id == GTK_CSS_PROPERTY_FONT_SIZE)
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return _gtk_css_number_value_new (number->value / 100.0 *
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get_base_font_size (property_id, provider, values, parent_values, dependencies),
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GTK_CSS_PX);
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case GTK_CSS_NUMBER:
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case GTK_CSS_PX:
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case GTK_CSS_DEG:
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case GTK_CSS_S:
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return _gtk_css_value_ref (number);
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case GTK_CSS_PT:
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return _gtk_css_number_value_new (number->value * 96.0 / 72.0,
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GTK_CSS_PX);
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case GTK_CSS_PC:
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return _gtk_css_number_value_new (number->value * 96.0 / 72.0 * 12.0,
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GTK_CSS_PX);
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break;
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case GTK_CSS_IN:
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return _gtk_css_number_value_new (number->value * 96.0,
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GTK_CSS_PX);
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break;
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case GTK_CSS_CM:
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return _gtk_css_number_value_new (number->value * 96.0 * 0.39370078740157477,
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GTK_CSS_PX);
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break;
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case GTK_CSS_MM:
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return _gtk_css_number_value_new (number->value * 96.0 * 0.039370078740157477,
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GTK_CSS_PX);
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break;
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case GTK_CSS_EM:
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return _gtk_css_number_value_new (number->value *
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get_base_font_size (property_id, provider, values, parent_values, dependencies),
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GTK_CSS_PX);
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break;
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case GTK_CSS_EX:
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/* for now we pretend ex is half of em */
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return _gtk_css_number_value_new (number->value * 0.5 *
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get_base_font_size (property_id, provider, values, parent_values, dependencies),
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GTK_CSS_PX);
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case GTK_CSS_RAD:
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return _gtk_css_number_value_new (number->value * 360.0 / (2 * G_PI),
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GTK_CSS_DEG);
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case GTK_CSS_GRAD:
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return _gtk_css_number_value_new (number->value * 360.0 / 400.0,
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GTK_CSS_DEG);
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case GTK_CSS_TURN:
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return _gtk_css_number_value_new (number->value * 360.0,
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GTK_CSS_DEG);
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case GTK_CSS_MS:
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return _gtk_css_number_value_new (number->value / 1000.0,
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GTK_CSS_S);
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}
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}
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static gboolean
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gtk_css_value_number_equal (const GtkCssValue *number1,
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const GtkCssValue *number2)
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{
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return number1->unit == number2->unit &&
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number1->value == number2->value;
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}
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static GtkCssValue *
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gtk_css_value_number_transition (GtkCssValue *start,
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GtkCssValue *end,
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guint property_id,
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double progress)
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{
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/* FIXME: This needs to be supported at least for percentages,
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* but for that we kinda need to support calc(5px + 50%) */
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if (start->unit != end->unit)
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return NULL;
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return _gtk_css_number_value_new (start->value + (end->value - start->value) * progress,
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start->unit);
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}
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static void
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gtk_css_value_number_print (const GtkCssValue *number,
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GString *string)
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{
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char buf[G_ASCII_DTOSTR_BUF_SIZE];
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const char *names[] = {
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/* [GTK_CSS_NUMBER] = */ "",
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/* [GTK_CSS_PERCENT] = */ "%",
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/* [GTK_CSS_PX] = */ "px",
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/* [GTK_CSS_PT] = */ "pt",
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/* [GTK_CSS_EM] = */ "em",
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/* [GTK_CSS_EX] = */ "ex",
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/* [GTK_CSS_PC] = */ "pc",
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/* [GTK_CSS_IN] = */ "in",
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/* [GTK_CSS_CM] = */ "cm",
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/* [GTK_CSS_MM] = */ "mm",
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/* [GTK_CSS_RAD] = */ "rad",
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/* [GTK_CSS_DEG] = */ "deg",
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/* [GTK_CSS_GRAD] = */ "grad",
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/* [GTK_CSS_TURN] = */ "turn",
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/* [GTK_CSS_S] = */ "s",
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/* [GTK_CSS_MS] = */ "ms",
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};
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g_ascii_dtostr (buf, sizeof (buf), number->value);
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g_string_append (string, buf);
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if (number->value != 0.0)
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g_string_append (string, names[number->unit]);
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}
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static const GtkCssValueClass GTK_CSS_VALUE_NUMBER = {
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gtk_css_value_number_free,
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gtk_css_value_number_compute,
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gtk_css_value_number_equal,
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gtk_css_value_number_transition,
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gtk_css_value_number_print
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};
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GtkCssValue *
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_gtk_css_number_value_new (double value,
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GtkCssUnit unit)
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{
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static GtkCssValue number_singletons[] = {
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{ >K_CSS_VALUE_NUMBER, 1, GTK_CSS_NUMBER, 0 },
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{ >K_CSS_VALUE_NUMBER, 1, GTK_CSS_NUMBER, 1 },
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};
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static GtkCssValue px_singletons[] = {
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{ >K_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 0 },
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{ >K_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 1 },
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{ >K_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 2 },
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{ >K_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 3 },
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{ >K_CSS_VALUE_NUMBER, 1, GTK_CSS_PX, 4 },
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};
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GtkCssValue *result;
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if (unit == GTK_CSS_NUMBER && (value == 0 || value == 1))
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return _gtk_css_value_ref (&number_singletons[(int) value]);
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if (unit == GTK_CSS_PX &&
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(value == 0 ||
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value == 1 ||
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value == 2 ||
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value == 3 ||
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value == 4))
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{
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return _gtk_css_value_ref (&px_singletons[(int) value]);
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}
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result = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_NUMBER);
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result->unit = unit;
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result->value = value;
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return result;
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}
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GtkCssUnit
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_gtk_css_number_value_get_unit (const GtkCssValue *value)
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{
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g_return_val_if_fail (value->class == >K_CSS_VALUE_NUMBER, GTK_CSS_NUMBER);
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return value->unit;
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}
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double
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_gtk_css_number_value_get (const GtkCssValue *number,
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double one_hundred_percent)
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{
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g_return_val_if_fail (number != NULL, 0.0);
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g_return_val_if_fail (number->class == >K_CSS_VALUE_NUMBER, 0.0);
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if (number->unit == GTK_CSS_PERCENT)
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return number->value * one_hundred_percent / 100;
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else
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return number->value;
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}
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