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26 #ifndef TextAutosizer_h
27 #define TextAutosizer_h
29 #include "HTMLNames.h"
30 #include "platform/text/WritingMode.h"
31 #include "wtf/Noncopyable.h"
32 #include "wtf/PassOwnPtr.h"
40 struct TextAutosizingWindowInfo;
41 struct TextAutosizingClusterInfo;
43 class TextAutosizer FINAL {
44 WTF_MAKE_NONCOPYABLE(TextAutosizer);
47 static PassOwnPtr<TextAutosizer> create(Document* document) { return adoptPtr(new TextAutosizer(document)); }
49 bool processSubtree(RenderObject* layoutRoot);
50 void recalculateMultipliers();
52 static float computeAutosizedFontSize(float specifiedSize, float multiplier);
55 enum TraversalDirection {
66 explicit TextAutosizer(Document*);
68 float clusterMultiplier(WritingMode, const TextAutosizingWindowInfo&, float textWidth) const;
70 void processClusterInternal(TextAutosizingClusterInfo&, RenderBlock* container, RenderObject* subtreeRoot, const TextAutosizingWindowInfo&, float multiplier);
71 void processCluster(TextAutosizingClusterInfo&, RenderBlock* container, RenderObject* subtreeRoot, const TextAutosizingWindowInfo&);
72 void processCompositeCluster(Vector<TextAutosizingClusterInfo>&, const TextAutosizingWindowInfo&);
73 void processContainer(float multiplier, RenderBlock* container, TextAutosizingClusterInfo&, RenderObject* subtreeRoot, const TextAutosizingWindowInfo&);
75 bool clusterShouldBeAutosized(TextAutosizingClusterInfo&, float blockWidth);
76 bool compositeClusterShouldBeAutosized(Vector<TextAutosizingClusterInfo>&, float blockWidth);
77 bool clusterContainsForumComment(const RenderBlock* container, TextAutosizingClusterInfo&);
79 void setMultiplier(RenderObject*, float);
80 void setMultiplierForList(RenderObject* renderer, float multiplier);
82 ContentType detectContentType();
84 static bool isAutosizingContainer(const RenderObject*);
85 static bool isNarrowDescendant(const RenderBlock*, TextAutosizingClusterInfo& parentClusterInfo);
86 static bool isWiderDescendant(const RenderBlock*, const TextAutosizingClusterInfo& parentClusterInfo);
87 static bool isIndependentDescendant(const RenderBlock*);
88 static bool isAutosizingCluster(const RenderBlock*, TextAutosizingClusterInfo& parentClusterInfo);
90 static bool containerShouldBeAutosized(const RenderBlock* container);
91 static bool containerContainsOneOfTags(const RenderBlock* cluster, const Vector<QualifiedName>& tags);
92 static bool containerIsRowOfLinks(const RenderObject* container);
93 static bool contentHeightIsConstrained(const RenderBlock* container);
94 static void measureDescendantTextWidth(const RenderBlock* container, TextAutosizingClusterInfo&, float minTextWidth, float& textWidth);
96 // Use to traverse the tree of descendants, excluding descendants of containers (but returning the containers themselves).
97 static RenderObject* nextInPreOrderSkippingDescendantsOfContainers(const RenderObject*, const RenderObject* stayWithin);
99 static const RenderBlock* findDeepestBlockContainingAllText(const RenderBlock* cluster);
101 // Depending on the traversal direction specified, finds the first or the last leaf text node child that doesn't
102 // belong to any cluster.
103 static const RenderObject* findFirstTextLeafNotInCluster(const RenderObject*, size_t& depth, TraversalDirection);
105 // Returns groups of narrow descendants of a given autosizing cluster. The groups are combined
106 // by the difference between the width of the descendant and the width of the parent cluster's
107 // |blockContainingAllText|.
108 static void getNarrowDescendantsGroupedByWidth(const TextAutosizingClusterInfo& parentClusterInfo, Vector<Vector<TextAutosizingClusterInfo> >&);
110 Document* m_document;
111 ContentType m_contentType;
114 } // namespace WebCore
116 #endif // TextAutosizer_h