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.
121 lines
3.1 KiB
C
121 lines
3.1 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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{
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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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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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