cssvalue: Add a value for background-position
This commit is contained in:
Benjamin Otte
292
gtk/gtkcsspositionvalue.c
Normal file
292
gtk/gtkcsspositionvalue.c
Normal file
@ -0,0 +1,292 @@
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/* 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 "gtkcsspositionvalueprivate.h"
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#include "gtkcssnumbervalueprivate.h"
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struct _GtkCssValue {
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GTK_CSS_VALUE_BASE
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GtkCssValue *x;
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GtkCssValue *y;
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};
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static void
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gtk_css_value_position_free (GtkCssValue *value)
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{
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_gtk_css_value_unref (value->x);
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_gtk_css_value_unref (value->y);
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g_slice_free (GtkCssValue, value);
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}
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static gboolean
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gtk_css_value_position_equal (const GtkCssValue *position1,
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const GtkCssValue *position2)
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{
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return _gtk_css_value_equal (position1->x, position2->x)
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&& _gtk_css_value_equal (position1->y, position2->y);
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}
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static GtkCssValue *
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gtk_css_value_position_transition (GtkCssValue *start,
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GtkCssValue *end,
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double progress)
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{
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GtkCssValue *x, *y;
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x = _gtk_css_value_transition (start->x, end->x, progress);
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if (x == NULL)
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return NULL;
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y = _gtk_css_value_transition (start->y, end->y, progress);
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if (y == NULL)
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{
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_gtk_css_value_unref (x);
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return NULL;
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}
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return _gtk_css_position_value_new (x, y);
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}
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static void
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gtk_css_value_position_print (const GtkCssValue *position,
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GString *string)
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{
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struct {
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const char *x_name;
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const char *y_name;
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GtkCssValue *number;
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} values[] = {
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{ "left", "top", _gtk_css_number_value_new (0, GTK_CSS_PERCENT) },
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{ "right", "bottom", _gtk_css_number_value_new (100, GTK_CSS_PERCENT) }
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};
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GtkCssValue *center = _gtk_css_number_value_new (50, GTK_CSS_PERCENT);
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guint i;
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if (_gtk_css_value_equal (position->x, center))
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{
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if (_gtk_css_value_equal (position->y, center))
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{
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g_string_append (string, "center");
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goto done;
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}
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}
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else
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{
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for (i = 0; i < G_N_ELEMENTS (values); i++)
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{
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if (_gtk_css_value_equal (position->x, values[i].number))
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{
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g_string_append (string, values[i].x_name);
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break;
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}
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}
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if (i == G_N_ELEMENTS (values))
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_gtk_css_value_print (position->x, string);
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if (_gtk_css_value_equal (position->y, center))
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goto done;
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g_string_append_c (string, ' ');
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}
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for (i = 0; i < G_N_ELEMENTS (values); i++)
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{
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if (_gtk_css_value_equal (position->y, values[i].number))
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{
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g_string_append (string, values[i].y_name);
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goto done;
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}
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}
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if (i == G_N_ELEMENTS (values))
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{
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if (_gtk_css_value_equal (position->x, center))
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g_string_append (string, "center ");
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_gtk_css_value_print (position->y, string);
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}
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_gtk_css_value_print (position->x, string);
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if (!_gtk_css_value_equal (position->x, position->y))
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{
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g_string_append_c (string, ' ');
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_gtk_css_value_print (position->y, string);
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}
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done:
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for (i = 0; i < G_N_ELEMENTS (values); i++)
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_gtk_css_value_unref (values[i].number);
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_gtk_css_value_unref (center);
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}
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static const GtkCssValueClass GTK_CSS_VALUE_POSITION = {
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gtk_css_value_position_free,
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gtk_css_value_position_equal,
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gtk_css_value_position_transition,
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gtk_css_value_position_print
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};
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GtkCssValue *
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_gtk_css_position_value_new (GtkCssValue *x,
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GtkCssValue *y)
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{
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GtkCssValue *result;
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result = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_POSITION);
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result->x = x;
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result->y = y;
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return result;
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}
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GtkCssValue *
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_gtk_css_position_value_parse (GtkCssParser *parser)
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{
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static const struct {
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const char *name;
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guint percentage;
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gboolean horizontal;
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gboolean vertical;
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} names[] = {
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{ "left", 0, TRUE, FALSE },
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{ "right", 100, TRUE, FALSE },
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{ "center", 50, TRUE, TRUE },
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{ "top", 0, FALSE, TRUE },
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{ "bottom", 100, FALSE, TRUE },
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{ NULL , 0, TRUE, FALSE }, /* used for numbers */
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{ NULL , 50, TRUE, TRUE } /* used for no value */
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};
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GtkCssValue *x, *y;
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GtkCssValue **missing;
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guint first, second;
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for (first = 0; names[first].name != NULL; first++)
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{
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if (_gtk_css_parser_try (parser, names[first].name, TRUE))
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{
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if (names[first].horizontal)
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{
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x = _gtk_css_number_value_new (names[first].percentage, GTK_CSS_PERCENT);
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missing = &y;
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}
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else
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{
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y = _gtk_css_number_value_new (names[first].percentage, GTK_CSS_PERCENT);
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missing = &x;
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}
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break;
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}
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}
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if (names[first].name == NULL)
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{
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missing = &y;
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x = _gtk_css_number_value_parse (parser,
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GTK_CSS_PARSE_PERCENT
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| GTK_CSS_PARSE_LENGTH);
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if (x == NULL)
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return NULL;
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}
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for (second = 0; names[second].name != NULL; second++)
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{
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if (_gtk_css_parser_try (parser, names[second].name, TRUE))
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{
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*missing = _gtk_css_number_value_new (names[second].percentage, GTK_CSS_PERCENT);
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break;
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}
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}
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if (names[second].name == NULL)
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{
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if (_gtk_css_parser_has_number (parser))
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{
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if (missing != &y)
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{
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_gtk_css_parser_error (parser, "Invalid combination of values");
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_gtk_css_value_unref (y);
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return NULL;
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}
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y = _gtk_css_number_value_parse (parser,
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GTK_CSS_PARSE_PERCENT
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| GTK_CSS_PARSE_LENGTH);
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if (y == NULL)
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{
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_gtk_css_value_unref (x);
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return NULL;
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}
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}
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else
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{
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second++;
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*missing = _gtk_css_number_value_new (50, GTK_CSS_PERCENT);
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}
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}
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else
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{
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if ((names[first].horizontal && !names[second].vertical) ||
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(!names[first].horizontal && !names[second].horizontal))
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{
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_gtk_css_parser_error (parser, "Invalid combination of values");
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_gtk_css_value_unref (x);
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_gtk_css_value_unref (y);
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return NULL;
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}
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}
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return _gtk_css_position_value_new (x, y);
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}
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double
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_gtk_css_position_value_get_x (const GtkCssValue *position,
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double one_hundred_percent)
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{
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g_return_val_if_fail (position != NULL, 0.0);
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g_return_val_if_fail (position->class == >K_CSS_VALUE_POSITION, 0.0);
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return _gtk_css_number_value_get (position->x, one_hundred_percent);
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}
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double
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_gtk_css_position_value_get_y (const GtkCssValue *position,
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double one_hundred_percent)
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{
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g_return_val_if_fail (position != NULL, 0.0);
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g_return_val_if_fail (position->class == >K_CSS_VALUE_POSITION, 0.0);
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return _gtk_css_number_value_get (position->y, one_hundred_percent);
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}
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GtkCssValue *
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_gtk_css_position_value_compute (GtkCssValue *position,
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GtkStyleContext *context)
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{
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GtkCssValue *x, *y;
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g_return_val_if_fail (position->class == >K_CSS_VALUE_POSITION, NULL);
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x = _gtk_css_number_value_compute (position->x, context);
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y = _gtk_css_number_value_compute (position->y, context);
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if (x == position->x && y == position->y)
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{
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_gtk_css_value_unref (x);
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_gtk_css_value_unref (y);
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return _gtk_css_value_ref (position);
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}
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return _gtk_css_position_value_new (x, y);
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}
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