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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#include <AK/HashMap.h>
30#include <AK/NonnullRefPtr.h>
31#include <LibGfx/Font.h>
32#include <LibGfx/Forward.h>
33#include <LibHTML/CSS/StyleValue.h>
34
35class StyleProperties : public RefCounted<StyleProperties> {
36public:
37 StyleProperties();
38
39 explicit StyleProperties(const StyleProperties&);
40
41 static NonnullRefPtr<StyleProperties> create() { return adopt(*new StyleProperties); }
42
43 NonnullRefPtr<StyleProperties> clone() const;
44
45 template<typename Callback>
46 inline void for_each_property(Callback callback) const
47 {
48 for (auto& it : m_property_values)
49 callback((CSS::PropertyID)it.key, *it.value);
50 }
51
52 void set_property(CSS::PropertyID, NonnullRefPtr<StyleValue> value);
53 Optional<NonnullRefPtr<StyleValue>> property(CSS::PropertyID) const;
54
55 Length length_or_fallback(CSS::PropertyID, const Length& fallback) const;
56 String string_or_fallback(CSS::PropertyID, const StringView& fallback) const;
57 Color color_or_fallback(CSS::PropertyID, const Document&, Color fallback) const;
58
59 const Gfx::Font& font() const
60 {
61 if (!m_font)
62 load_font();
63 return *m_font;
64 }
65
66 float line_height() const;
67
68 bool operator==(const StyleProperties&) const;
69 bool operator!=(const StyleProperties& other) const { return !(*this == other); }
70
71private:
72 HashMap<unsigned, NonnullRefPtr<StyleValue>> m_property_values;
73
74 void load_font() const;
75
76 mutable RefPtr<Gfx::Font> m_font;
77};