forked from AuroraMiddleware/gtk
9b4ed66218
This is a reorganization of how value computing should be done. Previously the GtkCssStyleProperty.compute vfunc was supposed to take care of special cases when it needed those for computation. However, this proved to be very complicated in cases where values were nested and only the last value (of a common type) needed to be special cased. A common example for this was the fallback handling for unresolvable colors. Now, we pass the property's ID along with all compute functions so we can do the special casing where it's necessary. Note that no actual changes happen in this commit. This will happen in follow-ups.
320 lines
9.1 KiB
C
320 lines
9.1 KiB
C
/*
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* Copyright © 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 2.1 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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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#include "config.h"
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#include "gtkcssimagegradientprivate.h"
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#include "gtkcssprovider.h"
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#include "gtksymboliccolorprivate.h"
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G_DEFINE_TYPE (GtkCssImageGradient, _gtk_css_image_gradient, GTK_TYPE_CSS_IMAGE)
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static GtkCssImage *
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gtk_css_image_gradient_compute (GtkCssImage *image,
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guint property_id,
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GtkStyleContext *context)
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{
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GtkCssImageGradient *gradient = GTK_CSS_IMAGE_GRADIENT (image);
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GtkCssImageGradient *copy;
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if (gradient->pattern)
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return g_object_ref (gradient);
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copy = g_object_new (GTK_TYPE_CSS_IMAGE_GRADIENT, NULL);
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copy->gradient = gtk_gradient_ref (gradient->gradient);
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copy->pattern = gtk_gradient_resolve_for_context (copy->gradient, context);
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return GTK_CSS_IMAGE (copy);
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}
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static void
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gtk_css_image_gradient_draw (GtkCssImage *image,
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cairo_t *cr,
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double width,
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double height)
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{
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GtkCssImageGradient *gradient = GTK_CSS_IMAGE_GRADIENT (image);
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if (!gradient->pattern)
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{
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g_warning ("trying to paint unresolved gradient");
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return;
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}
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cairo_scale (cr, width, height);
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cairo_rectangle (cr, 0, 0, 1, 1);
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cairo_set_source (cr, gradient->pattern);
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cairo_fill (cr);
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}
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static gboolean
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gtk_css_image_gradient_parse (GtkCssImage *image,
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GtkCssParser *parser)
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{
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GtkCssImageGradient *gradient = GTK_CSS_IMAGE_GRADIENT (image);
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gradient->gradient = _gtk_gradient_parse (parser);
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return gradient->gradient != NULL;
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}
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static void
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gtk_css_image_gradient_print (GtkCssImage *image,
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GString *string)
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{
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GtkCssImageGradient *gradient = GTK_CSS_IMAGE_GRADIENT (image);
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char *s;
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s = gtk_gradient_to_string (gradient->gradient);
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g_string_append (string, s);
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g_free (s);
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}
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static void
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gtk_css_image_gradient_dispose (GObject *object)
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{
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GtkCssImageGradient *gradient = GTK_CSS_IMAGE_GRADIENT (object);
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if (gradient->gradient)
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{
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gtk_gradient_unref (gradient->gradient);
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gradient->gradient = NULL;
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}
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if (gradient->pattern)
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{
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cairo_pattern_destroy (gradient->pattern);
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gradient->pattern = NULL;
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}
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G_OBJECT_CLASS (_gtk_css_image_gradient_parent_class)->dispose (object);
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}
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static void
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_gtk_css_image_gradient_class_init (GtkCssImageGradientClass *klass)
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{
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GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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image_class->compute = gtk_css_image_gradient_compute;
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image_class->draw = gtk_css_image_gradient_draw;
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image_class->parse = gtk_css_image_gradient_parse;
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image_class->print = gtk_css_image_gradient_print;
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object_class->dispose = gtk_css_image_gradient_dispose;
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}
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static void
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_gtk_css_image_gradient_init (GtkCssImageGradient *image_gradient)
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{
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}
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GtkGradient *
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_gtk_gradient_parse (GtkCssParser *parser)
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{
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GtkGradient *gradient;
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cairo_pattern_type_t type;
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gdouble coords[6];
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guint i;
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g_return_val_if_fail (parser != NULL, NULL);
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if (!_gtk_css_parser_try (parser, "-gtk-gradient", TRUE))
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{
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_gtk_css_parser_error (parser,
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"Expected '-gtk-gradient'");
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return NULL;
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}
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if (!_gtk_css_parser_try (parser, "(", TRUE))
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{
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_gtk_css_parser_error (parser,
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"Expected '(' after '-gtk-gradient'");
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return NULL;
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}
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/* Parse gradient type */
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if (_gtk_css_parser_try (parser, "linear", TRUE))
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type = CAIRO_PATTERN_TYPE_LINEAR;
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else if (_gtk_css_parser_try (parser, "radial", TRUE))
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type = CAIRO_PATTERN_TYPE_RADIAL;
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else
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{
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_gtk_css_parser_error (parser,
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"Gradient type must be 'radial' or 'linear'");
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return NULL;
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}
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/* Parse start/stop position parameters */
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for (i = 0; i < 2; i++)
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{
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if (! _gtk_css_parser_try (parser, ",", TRUE))
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{
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_gtk_css_parser_error (parser,
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"Expected ','");
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return NULL;
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}
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if (_gtk_css_parser_try (parser, "left", TRUE))
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coords[i * 3] = 0;
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else if (_gtk_css_parser_try (parser, "right", TRUE))
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coords[i * 3] = 1;
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else if (_gtk_css_parser_try (parser, "center", TRUE))
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coords[i * 3] = 0.5;
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else if (!_gtk_css_parser_try_double (parser, &coords[i * 3]))
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{
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_gtk_css_parser_error (parser,
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"Expected a valid X coordinate");
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return NULL;
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}
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if (_gtk_css_parser_try (parser, "top", TRUE))
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coords[i * 3 + 1] = 0;
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else if (_gtk_css_parser_try (parser, "bottom", TRUE))
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coords[i * 3 + 1] = 1;
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else if (_gtk_css_parser_try (parser, "center", TRUE))
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coords[i * 3 + 1] = 0.5;
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else if (!_gtk_css_parser_try_double (parser, &coords[i * 3 + 1]))
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{
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_gtk_css_parser_error (parser,
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"Expected a valid Y coordinate");
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return NULL;
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}
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if (type == CAIRO_PATTERN_TYPE_RADIAL)
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{
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/* Parse radius */
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if (! _gtk_css_parser_try (parser, ",", TRUE))
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{
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_gtk_css_parser_error (parser,
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"Expected ','");
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return NULL;
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}
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if (! _gtk_css_parser_try_double (parser, &coords[(i * 3) + 2]))
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{
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_gtk_css_parser_error (parser,
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"Expected a numer for the radius");
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return NULL;
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}
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}
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}
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if (type == CAIRO_PATTERN_TYPE_LINEAR)
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gradient = gtk_gradient_new_linear (coords[0], coords[1], coords[3], coords[4]);
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else
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gradient = gtk_gradient_new_radial (coords[0], coords[1], coords[2],
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coords[3], coords[4], coords[5]);
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while (_gtk_css_parser_try (parser, ",", TRUE))
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{
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GtkSymbolicColor *color;
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gdouble position;
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if (_gtk_css_parser_try (parser, "from", TRUE))
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{
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position = 0;
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if (!_gtk_css_parser_try (parser, "(", TRUE))
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{
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gtk_gradient_unref (gradient);
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_gtk_css_parser_error (parser,
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"Expected '('");
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return NULL;
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}
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}
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else if (_gtk_css_parser_try (parser, "to", TRUE))
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{
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position = 1;
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if (!_gtk_css_parser_try (parser, "(", TRUE))
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{
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gtk_gradient_unref (gradient);
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_gtk_css_parser_error (parser,
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"Expected '('");
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return NULL;
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}
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}
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else if (_gtk_css_parser_try (parser, "color-stop", TRUE))
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{
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if (!_gtk_css_parser_try (parser, "(", TRUE))
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{
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gtk_gradient_unref (gradient);
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_gtk_css_parser_error (parser,
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"Expected '('");
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return NULL;
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}
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if (!_gtk_css_parser_try_double (parser, &position))
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{
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gtk_gradient_unref (gradient);
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_gtk_css_parser_error (parser,
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"Expected a valid number");
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return NULL;
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}
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if (!_gtk_css_parser_try (parser, ",", TRUE))
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{
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gtk_gradient_unref (gradient);
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_gtk_css_parser_error (parser,
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"Expected a comma");
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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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gtk_gradient_unref (gradient);
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_gtk_css_parser_error (parser,
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"Not a valid color-stop definition");
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return NULL;
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}
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color = _gtk_symbolic_color_new_take_value (_gtk_css_symbolic_value_new (parser));
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if (color == NULL)
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{
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gtk_gradient_unref (gradient);
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return NULL;
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}
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gtk_gradient_add_color_stop (gradient, position, color);
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gtk_symbolic_color_unref (color);
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if (!_gtk_css_parser_try (parser, ")", TRUE))
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{
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gtk_gradient_unref (gradient);
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_gtk_css_parser_error (parser,
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"Expected ')'");
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return NULL;
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}
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}
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if (!_gtk_css_parser_try (parser, ")", TRUE))
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{
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gtk_gradient_unref (gradient);
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_gtk_css_parser_error (parser,
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"Expected ')'");
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return NULL;
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}
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return gradient;
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}
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