forked from AuroraMiddleware/gtk
0e2f35ed88
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.
124 lines
3.2 KiB
C
124 lines
3.2 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 "gtkcssimagevalueprivate.h"
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#include "gtkcssimagecrossfadeprivate.h"
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struct _GtkCssValue {
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GTK_CSS_VALUE_BASE
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GtkCssImage *image;
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};
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static void
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gtk_css_value_image_free (GtkCssValue *value)
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{
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g_object_unref (value->image);
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g_slice_free (GtkCssValue, value);
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}
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static GtkCssValue *
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gtk_css_value_image_compute (GtkCssValue *value,
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guint property_id,
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GtkStyleContext *context,
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GtkCssDependencies *dependencies)
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{
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GtkCssImage *image, *computed;
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image = _gtk_css_image_value_get_image (value);
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if (image == NULL)
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return _gtk_css_value_ref (value);
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computed = _gtk_css_image_compute (image, property_id, context);
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if (computed == image)
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{
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g_object_unref (computed);
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return _gtk_css_value_ref (value);
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}
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*dependencies = GTK_CSS_DEPENDS_ON_EVERYTHING;
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return _gtk_css_image_value_new (computed);
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}
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static gboolean
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gtk_css_value_image_equal (const GtkCssValue *value1,
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const GtkCssValue *value2)
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{
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return value1->image == value2->image;
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}
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static GtkCssValue *
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gtk_css_value_image_transition (GtkCssValue *start,
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GtkCssValue *end,
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double progress)
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{
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GtkCssImage *fade;
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fade = _gtk_css_image_cross_fade_new (_gtk_css_image_value_get_image (start),
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_gtk_css_image_value_get_image (end),
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progress);
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return _gtk_css_image_value_new (fade);
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}
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static void
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gtk_css_value_image_print (const GtkCssValue *value,
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GString *string)
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{
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if (value->image)
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_gtk_css_image_print (value->image, string);
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else
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g_string_append (string, "none");
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}
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static const GtkCssValueClass GTK_CSS_VALUE_IMAGE = {
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gtk_css_value_image_free,
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gtk_css_value_image_compute,
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gtk_css_value_image_equal,
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gtk_css_value_image_transition,
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gtk_css_value_image_print
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};
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GtkCssValue *
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_gtk_css_image_value_new (GtkCssImage *image)
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{
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static GtkCssValue none_singleton = { >K_CSS_VALUE_IMAGE, 1, NULL };
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GtkCssValue *value;
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if (image == NULL)
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return _gtk_css_value_ref (&none_singleton);
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value = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_IMAGE);
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value->image = image;
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return value;
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}
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GtkCssImage *
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_gtk_css_image_value_get_image (const GtkCssValue *value)
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{
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g_return_val_if_fail (value->class == >K_CSS_VALUE_IMAGE, NULL);
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return value->image;
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}
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