1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/* GTK - The GIMP Toolkit
* Copyright (C) 2011 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtkprivate.h"
#include "gtkcssvalueprivate.h"
#include "gtkcssstyleprivate.h"
#include "gtkstyleproviderprivate.h"
struct _GtkCssValue {
GTK_CSS_VALUE_BASE
};
G_DEFINE_BOXED_TYPE (GtkCssValue, _gtk_css_value, _gtk_css_value_ref, _gtk_css_value_unref)
GtkCssValue *
_gtk_css_value_alloc (const GtkCssValueClass *klass,
gsize size)
{
GtkCssValue *value;
value = g_slice_alloc0 (size);
value->class = klass;
value->ref_count = 1;
return value;
}
GtkCssValue *
gtk_css_value_ref (GtkCssValue *value)
{
gtk_internal_return_val_if_fail (value != NULL, NULL);
value->ref_count += 1;
return value;
}
void
gtk_css_value_unref (GtkCssValue *value)
{
if (value == NULL)
return;
value->ref_count -= 1;
if (value->ref_count > 0)
return;
value->class->free (value);
}
/**
* _gtk_css_value_compute:
* @value: the value to compute from
* @property_id: the ID of the property to compute
* @provider: Style provider for looking up extra information
* @style: Style to compute for
* @parent_style: parent style to use for inherited values
*
* Converts the specified @value into the computed value for the CSS
* property given by @property_id using the information in @context.
* This step is explained in detail in the
* [CSS Documentation](http://www.w3.org/TR/css3-cascade/#computed).
*
* Returns: the computed value
**/
GtkCssValue *
_gtk_css_value_compute (GtkCssValue *value,
guint property_id,
GtkStyleProvider *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
return value->class->compute (value, property_id, provider, style, parent_style);
}
gboolean
_gtk_css_value_equal (const GtkCssValue *value1,
const GtkCssValue *value2)
{
gtk_internal_return_val_if_fail (value1 != NULL, FALSE);
gtk_internal_return_val_if_fail (value2 != NULL, FALSE);
if (value1 == value2)
return TRUE;
if (value1->class != value2->class)
return FALSE;
return value1->class->equal (value1, value2);
}
gboolean
_gtk_css_value_equal0 (const GtkCssValue *value1,
const GtkCssValue *value2)
{
/* Inclues both values being NULL */
if (value1 == value2)
return TRUE;
if (value1 == NULL || value2 == NULL)
return FALSE;
return _gtk_css_value_equal (value1, value2);
}
GtkCssValue *
_gtk_css_value_transition (GtkCssValue *start,
GtkCssValue *end,
guint property_id,
double progress)
{
gtk_internal_return_val_if_fail (start != NULL, FALSE);
gtk_internal_return_val_if_fail (end != NULL, FALSE);
/* We compare functions here instead of classes so that number
* values can all transition to each other */
if (start->class->transition != end->class->transition)
return NULL;
return start->class->transition (start, end, property_id, progress);
}
char *
_gtk_css_value_to_string (const GtkCssValue *value)
{
GString *string;
gtk_internal_return_val_if_fail (value != NULL, NULL);
string = g_string_new (NULL);
_gtk_css_value_print (value, string);
return g_string_free (string, FALSE);
}
/**
* _gtk_css_value_print:
* @value: the value to print
* @string: the string to print to
*
* Prints @value to the given @string in CSS format. The @value must be a
* valid specified value as parsed using the parse functions or as assigned
* via _gtk_style_property_assign().
**/
void
_gtk_css_value_print (const GtkCssValue *value,
GString *string)
{
gtk_internal_return_if_fail (value != NULL);
gtk_internal_return_if_fail (string != NULL);
value->class->print (value, string);
}
/**
* gtk_css_value_is_dynamic:
* @value: a #GtkCssValue
*
* A "dynamic" value has a different value at different times. This means that
* the value needs to be animated when time is progressing.
*
* Examples of dynamic values are animated images, such as videos or dynamic shaders.
*
* Use gtk_css_value_get_dynamic_value() to get the value for a given timestamp.
*
* Returns %TRUE if the value is dynamic
*/
gboolean
gtk_css_value_is_dynamic (GtkCssValue *value)
{
gtk_internal_return_val_if_fail (value != NULL, FALSE);
if (!value->class->is_dynamic)
return FALSE;
return value->class->is_dynamic (value);
}
/**
* gtk_css_value_get_dynamic_value:
* @value: a #GtkCssValue
* @monotonic_time: the timestamp for which to get the dynamic value
*
* Gets the dynamic value for a given timestamp. If @monotonic_time is 0,
* the default value is returned.
*
* See gtk_css_value_is_dynamic() for details about dynamic values.
*
* Returns: (transfer full): The dynamic value for @value at the given
* timestamp
**/
GtkCssValue *
gtk_css_value_get_dynamic_value (GtkCssValue *value,
gint64 monotonic_time)
{
gtk_internal_return_val_if_fail (value != NULL, NULL);
if (!value->class->get_dynamic_value)
return gtk_css_value_ref (value);
return value->class->get_dynamic_value (value, monotonic_time);
}
|
