1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB.  If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22#ifndef StyleResolverState_h
23#define StyleResolverState_h
24
25#include "core/CSSPropertyNames.h"
26
27#include "core/css/CSSSVGDocumentValue.h"
28#include "core/css/CSSToLengthConversionData.h"
29#include "core/css/resolver/CSSToStyleMap.h"
30#include "core/css/resolver/ElementResolveContext.h"
31#include "core/css/resolver/ElementStyleResources.h"
32#include "core/css/resolver/FontBuilder.h"
33#include "core/dom/Document.h"
34#include "core/dom/Element.h"
35#include "core/rendering/style/CachedUAStyle.h"
36#include "core/rendering/style/RenderStyle.h"
37#include "core/rendering/style/StyleInheritedData.h"
38
39namespace blink {
40
41class CSSAnimationUpdate;
42class FontDescription;
43
44class StyleResolverState {
45    STACK_ALLOCATED();
46    WTF_MAKE_NONCOPYABLE(StyleResolverState);
47public:
48    StyleResolverState(Document&, Element*, RenderStyle* parentStyle = 0);
49    ~StyleResolverState();
50
51    // In FontFaceSet and CanvasRenderingContext2D, we don't have an element to grab the document from.
52    // This is why we have to store the document separately.
53    Document& document() const { return *m_document; }
54    // These are all just pass-through methods to ElementResolveContext.
55    Element* element() const { return m_elementContext.element(); }
56    const ContainerNode* parentNode() const { return m_elementContext.parentNode(); }
57    const RenderStyle* rootElementStyle() const { return m_elementContext.rootElementStyle(); }
58    EInsideLink elementLinkState() const { return m_elementContext.elementLinkState(); }
59    bool distributedToInsertionPoint() const { return m_elementContext.distributedToInsertionPoint(); }
60
61    const ElementResolveContext& elementContext() const { return m_elementContext; }
62
63    void setStyle(PassRefPtr<RenderStyle> style) { m_style = style; m_cssToLengthConversionData.setStyle(m_style.get()); }
64    const RenderStyle* style() const { return m_style.get(); }
65    RenderStyle* style() { return m_style.get(); }
66    PassRefPtr<RenderStyle> takeStyle() { return m_style.release(); }
67
68    const CSSToLengthConversionData& cssToLengthConversionData() const { return m_cssToLengthConversionData; }
69
70    void setAnimationUpdate(PassOwnPtrWillBeRawPtr<CSSAnimationUpdate>);
71    const CSSAnimationUpdate* animationUpdate() { return m_animationUpdate.get(); }
72    PassOwnPtrWillBeRawPtr<CSSAnimationUpdate> takeAnimationUpdate();
73
74    void setParentStyle(PassRefPtr<RenderStyle> parentStyle) { m_parentStyle = parentStyle; }
75    const RenderStyle* parentStyle() const { return m_parentStyle.get(); }
76    RenderStyle* parentStyle() { return m_parentStyle.get(); }
77
78    // FIXME: These are effectively side-channel "out parameters" for the various
79    // map functions. When we map from CSS to style objects we use this state object
80    // to track various meta-data about that mapping (e.g. if it's cache-able).
81    // We need to move this data off of StyleResolverState and closer to the
82    // objects it applies to. Possibly separating (immutable) inputs from (mutable) outputs.
83    void setApplyPropertyToRegularStyle(bool isApply) { m_applyPropertyToRegularStyle = isApply; }
84    void setApplyPropertyToVisitedLinkStyle(bool isApply) { m_applyPropertyToVisitedLinkStyle = isApply; }
85    bool applyPropertyToRegularStyle() const { return m_applyPropertyToRegularStyle; }
86    bool applyPropertyToVisitedLinkStyle() const { return m_applyPropertyToVisitedLinkStyle; }
87
88    // Holds all attribute names found while applying "content" properties that contain an "attr()" value.
89    Vector<AtomicString>& contentAttrValues() { return m_contentAttrValues; }
90
91    void setLineHeightValue(CSSValue* value) { m_lineHeightValue = value; }
92    CSSValue* lineHeightValue() { return m_lineHeightValue; }
93
94    void cacheUserAgentBorderAndBackground()
95    {
96        // RenderTheme only needs the cached style if it has an appearance,
97        // and constructing it is expensive so we avoid it if possible.
98        if (!style()->hasAppearance())
99            return;
100
101        m_cachedUAStyle = CachedUAStyle::create(style());
102    }
103
104    const CachedUAStyle* cachedUAStyle() const
105    {
106        return m_cachedUAStyle.get();
107    }
108
109    ElementStyleResources& elementStyleResources() { return m_elementStyleResources; }
110    const CSSToStyleMap& styleMap() const { return m_styleMap; }
111    CSSToStyleMap& styleMap() { return m_styleMap; }
112
113    // FIXME: Once styleImage can be made to not take a StyleResolverState
114    // this convenience function should be removed. As-is, without this, call
115    // sites are extremely verbose.
116    PassRefPtr<StyleImage> styleImage(CSSPropertyID propertyId, CSSValue* value)
117    {
118        return m_elementStyleResources.styleImage(document(), document().textLinkColors(), style()->color(), propertyId, value);
119    }
120
121    FontBuilder& fontBuilder() { return m_fontBuilder; }
122    // FIXME: These exist as a primitive way to track mutations to font-related properties
123    // on a RenderStyle. As designed, these are very error-prone, as some callers
124    // set these directly on the RenderStyle w/o telling us. Presumably we'll
125    // want to design a better wrapper around RenderStyle for tracking these mutations
126    // and separate it from StyleResolverState.
127    const FontDescription& parentFontDescription() { return m_parentStyle->fontDescription(); }
128    void setZoom(float f) { m_fontBuilder.didChangeFontParameters(m_style->setZoom(f)); }
129    void setEffectiveZoom(float f) { m_fontBuilder.didChangeFontParameters(m_style->setEffectiveZoom(f)); }
130    void setWritingMode(WritingMode writingMode) { m_fontBuilder.didChangeFontParameters(m_style->setWritingMode(writingMode)); }
131    void setTextOrientation(TextOrientation textOrientation) { m_fontBuilder.didChangeFontParameters(m_style->setTextOrientation(textOrientation)); }
132
133private:
134    ElementResolveContext m_elementContext;
135    RawPtrWillBeMember<Document> m_document;
136
137    // m_style is the primary output for each element's style resolve.
138    RefPtr<RenderStyle> m_style;
139
140    CSSToLengthConversionData m_cssToLengthConversionData;
141
142    // m_parentStyle is not always just element->parentNode()->style()
143    // so we keep it separate from m_elementContext.
144    RefPtr<RenderStyle> m_parentStyle;
145
146    OwnPtrWillBeMember<CSSAnimationUpdate> m_animationUpdate;
147
148    bool m_applyPropertyToRegularStyle;
149    bool m_applyPropertyToVisitedLinkStyle;
150
151    RawPtrWillBeMember<CSSValue> m_lineHeightValue;
152
153    FontBuilder m_fontBuilder;
154
155    OwnPtr<CachedUAStyle> m_cachedUAStyle;
156
157    ElementStyleResources m_elementStyleResources;
158    // CSSToStyleMap is a pure-logic class and only contains
159    // a back-pointer to this object.
160    CSSToStyleMap m_styleMap;
161    Vector<AtomicString> m_contentAttrValues;
162};
163
164} // namespace blink
165
166#endif // StyleResolverState_h
167