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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TextAutosizer_h
#define TextAutosizer_h
#if ENABLE(TEXT_AUTOSIZING)
#include "IntSize.h"
#include <wtf/Noncopyable.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/PassRefPtr.h>
namespace WebCore {
class Document;
class RenderBlock;
class RenderObject;
class RenderStyle;
class RenderText;
struct TextAutosizingWindowInfo;
class TextAutosizer {
WTF_MAKE_NONCOPYABLE(TextAutosizer);
public:
static PassOwnPtr<TextAutosizer> create(Document* document) { return adoptPtr(new TextAutosizer(document)); }
virtual ~TextAutosizer();
bool processSubtree(RenderObject* layoutRoot);
static float computeAutosizedFontSize(float specifiedSize, float multiplier);
private:
enum TraversalDirection {
FirstToLast,
LastToFirst
};
explicit TextAutosizer(Document*);
void processCluster(RenderBlock* cluster, RenderBlock* container, RenderObject* subtreeRoot, const TextAutosizingWindowInfo&);
void processContainer(float multiplier, RenderBlock* container, RenderObject* subtreeRoot, const TextAutosizingWindowInfo&);
void setMultiplier(RenderObject*, float);
static bool isAutosizingContainer(const RenderObject*);
static bool isAutosizingCluster(const RenderBlock*);
static bool clusterShouldBeAutosized(const RenderBlock* lowestCommonAncestor, float commonAncestorWidth);
static void measureDescendantTextWidth(const RenderBlock* container, float minTextWidth, float& textWidth);
// Use to traverse the tree of descendants, excluding descendants of containers (but returning the containers themselves).
static RenderObject* nextInPreOrderSkippingDescendantsOfContainers(const RenderObject* current, const RenderObject* stayWithin);
// Finds the lowest common ancestor of the first and the last descendant
// text node (excluding those belonging to other autosizing clusters).
static const RenderBlock* findDeepestBlockContainingAllText(const RenderBlock* cluster);
// Depending on the traversal direction specified, finds the first or the last leaf text node child that doesn't
// belong to any cluster.
static const RenderObject* findFirstTextLeafNotInCluster(const RenderObject*, size_t& depth, TraversalDirection);
Document* m_document;
};
} // namespace WebCore
#endif // ENABLE(TEXT_AUTOSIZING)
#endif // TextAutosizer_h
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