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26 #ifndef TextAutosizer_h
27 #define TextAutosizer_h
29 #if ENABLE(TEXT_AUTOSIZING)
31 #include "HTMLNames.h"
32 #include "WritingMode.h"
33 #include <wtf/Noncopyable.h>
34 #include <wtf/PassOwnPtr.h>
42 struct TextAutosizingWindowInfo;
43 struct TextAutosizingClusterInfo;
46 WTF_MAKE_NONCOPYABLE(TextAutosizer);
49 static PassOwnPtr<TextAutosizer> create(Document* document) { return adoptPtr(new TextAutosizer(document)); }
51 virtual ~TextAutosizer();
53 bool processSubtree(RenderObject* layoutRoot);
54 void recalculateMultipliers();
56 static float computeAutosizedFontSize(float specifiedSize, float multiplier);
59 enum TraversalDirection {
64 explicit TextAutosizer(Document*);
66 float clusterMultiplier(WritingMode, const TextAutosizingWindowInfo&, float textWidth) const;
68 void processClusterInternal(TextAutosizingClusterInfo&, RenderBlock* container, RenderObject* subtreeRoot, const TextAutosizingWindowInfo&, float multiplier);
69 void processCluster(TextAutosizingClusterInfo&, RenderBlock* container, RenderObject* subtreeRoot, const TextAutosizingWindowInfo&);
70 void processCompositeCluster(Vector<TextAutosizingClusterInfo>&, const TextAutosizingWindowInfo&);
71 void processContainer(float multiplier, RenderBlock* container, TextAutosizingClusterInfo&, RenderObject* subtreeRoot, const TextAutosizingWindowInfo&);
73 void setMultiplier(RenderObject*, float);
75 static bool isAutosizingContainer(const RenderObject*);
76 static bool isNarrowDescendant(const RenderBlock*, TextAutosizingClusterInfo& parentClusterInfo);
77 static bool isWiderDescendant(const RenderBlock*, const TextAutosizingClusterInfo& parentClusterInfo);
78 static bool isIndependentDescendant(const RenderBlock*);
79 static bool isAutosizingCluster(const RenderBlock*, TextAutosizingClusterInfo& parentClusterInfo);
81 static bool containerShouldBeAutosized(const RenderBlock* container);
82 static bool containerContainsOneOfTags(const RenderBlock* cluster, const Vector<QualifiedName>& tags);
83 static bool containerIsRowOfLinks(const RenderObject* container);
84 static bool contentHeightIsConstrained(const RenderBlock* container);
85 static bool clusterShouldBeAutosized(TextAutosizingClusterInfo&, float blockWidth);
86 static bool compositeClusterShouldBeAutosized(Vector<TextAutosizingClusterInfo>&, float blockWidth);
87 static void measureDescendantTextWidth(const RenderBlock* container, TextAutosizingClusterInfo&, float minTextWidth, float& textWidth);
89 // Use to traverse the tree of descendants, excluding descendants of containers (but returning the containers themselves).
90 static RenderObject* nextInPreOrderSkippingDescendantsOfContainers(const RenderObject*, const RenderObject* stayWithin);
92 static const RenderBlock* findDeepestBlockContainingAllText(const RenderBlock* cluster);
94 // Depending on the traversal direction specified, finds the first or the last leaf text node child that doesn't
95 // belong to any cluster.
96 static const RenderObject* findFirstTextLeafNotInCluster(const RenderObject*, size_t& depth, TraversalDirection);
98 // Returns groups of narrow descendants of a given autosizing cluster. The groups are combined
99 // by the difference between the width of the descendant and the width of the parent cluster's
100 // |blockContainingAllText|.
101 static void getNarrowDescendantsGroupedByWidth(const TextAutosizingClusterInfo& parentClusterInfo, Vector<Vector<TextAutosizingClusterInfo> >&);
103 Document* m_document;
106 } // namespace WebCore
108 #endif // ENABLE(TEXT_AUTOSIZING)
110 #endif // TextAutosizer_h