#include "config.h"
#if ENABLE(TEXT_AUTOSIZING)
#include "TextAutosizer.h"
#include "Document.h"
#include "HTMLElement.h"
#include "InspectorInstrumentation.h"
#include "IntSize.h"
#include "RenderObject.h"
#include "RenderStyle.h"
#include "RenderText.h"
#include "RenderView.h"
#include "Settings.h"
#include "StyleInheritedData.h"
#include <algorithm>
#include <wtf/StdLibExtras.h>
#include <wtf/Vector.h>
namespace WebCore {
using namespace HTMLNames;
struct TextAutosizingWindowInfo {
IntSize windowSize;
IntSize minLayoutSize;
};
struct TextAutosizingClusterInfo {
explicit TextAutosizingClusterInfo(RenderBlock* root)
: root(root)
, blockContainingAllText(0)
, maxAllowedDifferenceFromTextWidth(150)
{
}
RenderBlock* root;
const RenderBlock* blockContainingAllText;
float maxAllowedDifferenceFromTextWidth;
Vector<TextAutosizingClusterInfo> narrowDescendants;
};
static const Vector<QualifiedName>& formInputTags()
{
DEPRECATED_DEFINE_STATIC_LOCAL(Vector<QualifiedName>, formInputTags, ());
if (formInputTags.isEmpty()) {
formInputTags.append(inputTag);
formInputTags.append(buttonTag);
formInputTags.append(selectTag);
}
return formInputTags;
}
TextAutosizer::TextAutosizer(Document* document)
: m_document(document)
{
}
TextAutosizer::~TextAutosizer()
{
}
void TextAutosizer::recalculateMultipliers()
{
RenderObject* renderer = m_document->renderer();
while (renderer) {
if (renderer->style() && renderer->style()->textAutosizingMultiplier() != 1)
setMultiplier(renderer, 1);
renderer = renderer->nextInPreOrder();
}
}
bool TextAutosizer::processSubtree(RenderObject* layoutRoot)
{
if (!m_document->settings() || !m_document->settings()->textAutosizingEnabled() || layoutRoot->view()->printing() || !m_document->page())
return false;
Frame& mainFrame = m_document->page()->mainFrame();
TextAutosizingWindowInfo windowInfo;
windowInfo.windowSize = m_document->settings()->textAutosizingWindowSizeOverride();
if (windowInfo.windowSize.isEmpty())
windowInfo.windowSize = mainFrame.view()->unscaledVisibleContentSize(ScrollableArea::IncludeScrollbars);
windowInfo.minLayoutSize = mainFrame.view()->layoutSize();
for (Frame* frame = m_document->frame(); frame; frame = frame->tree().parent()) {
if (!frame->view()->isInChildFrameWithFrameFlattening())
windowInfo.minLayoutSize = windowInfo.minLayoutSize.shrunkTo(frame->view()->layoutSize());
}
RenderBlock* container = layoutRoot->isRenderBlock() ? toRenderBlock(layoutRoot) : layoutRoot->containingBlock();
while (container && !isAutosizingContainer(container))
container = container->containingBlock();
RenderBlock* cluster = container;
while (cluster && (!isAutosizingContainer(cluster) || !isIndependentDescendant(cluster)))
cluster = cluster->containingBlock();
TextAutosizingClusterInfo clusterInfo(cluster);
processCluster(clusterInfo, container, layoutRoot, windowInfo);
return true;
}
float TextAutosizer::clusterMultiplier(WritingMode writingMode, const TextAutosizingWindowInfo& windowInfo, float textWidth) const
{
int logicalWindowWidth = isHorizontalWritingMode(writingMode) ? windowInfo.windowSize.width() : windowInfo.windowSize.height();
int logicalLayoutWidth = isHorizontalWritingMode(writingMode) ? windowInfo.minLayoutSize.width() : windowInfo.minLayoutSize.height();
float logicalClusterWidth = std::min<float>(textWidth, logicalLayoutWidth);
float multiplier = logicalClusterWidth / logicalWindowWidth;
multiplier *= m_document->settings()->textAutosizingFontScaleFactor();
return std::max(1.0f, multiplier);
}
void TextAutosizer::processClusterInternal(TextAutosizingClusterInfo& clusterInfo, RenderBlock* container, RenderObject* subtreeRoot, const TextAutosizingWindowInfo& windowInfo, float multiplier)
{
processContainer(multiplier, container, clusterInfo, subtreeRoot, windowInfo);
Vector<Vector<TextAutosizingClusterInfo> > narrowDescendantsGroups;
getNarrowDescendantsGroupedByWidth(clusterInfo, narrowDescendantsGroups);
for (size_t i = 0; i < narrowDescendantsGroups.size(); ++i)
processCompositeCluster(narrowDescendantsGroups[i], windowInfo);
}
void TextAutosizer::processCluster(TextAutosizingClusterInfo& clusterInfo, RenderBlock* container, RenderObject* subtreeRoot, const TextAutosizingWindowInfo& windowInfo)
{
clusterInfo.blockContainingAllText = findDeepestBlockContainingAllText(clusterInfo.root);
float textWidth = clusterInfo.blockContainingAllText->contentLogicalWidth();
float multiplier = 1.0;
if (clusterShouldBeAutosized(clusterInfo, textWidth))
multiplier = clusterMultiplier(clusterInfo.root->style()->writingMode(), windowInfo, textWidth);
processClusterInternal(clusterInfo, container, subtreeRoot, windowInfo, multiplier);
}
void TextAutosizer::processCompositeCluster(Vector<TextAutosizingClusterInfo>& clusterInfos, const TextAutosizingWindowInfo& windowInfo)
{
if (clusterInfos.isEmpty())
return;
float maxTextWidth = 0;
for (size_t i = 0; i < clusterInfos.size(); ++i) {
TextAutosizingClusterInfo& clusterInfo = clusterInfos[i];
clusterInfo.blockContainingAllText = findDeepestBlockContainingAllText(clusterInfo.root);
maxTextWidth = max<float>(maxTextWidth, clusterInfo.blockContainingAllText->contentLogicalWidth());
}
float multiplier = 1.0;
if (compositeClusterShouldBeAutosized(clusterInfos, maxTextWidth))
multiplier = clusterMultiplier(clusterInfos[0].root->style()->writingMode(), windowInfo, maxTextWidth);
for (size_t i = 0; i < clusterInfos.size(); ++i) {
ASSERT(clusterInfos[i].root->style()->writingMode() == clusterInfos[0].root->style()->writingMode());
processClusterInternal(clusterInfos[i], clusterInfos[i].root, clusterInfos[i].root, windowInfo, multiplier);
}
}
void TextAutosizer::processContainer(float multiplier, RenderBlock* container, TextAutosizingClusterInfo& clusterInfo, RenderObject* subtreeRoot, const TextAutosizingWindowInfo& windowInfo)
{
ASSERT(isAutosizingContainer(container));
float localMultiplier = containerShouldBeAutosized(container) ? multiplier: 1;
RenderObject* descendant = nextInPreOrderSkippingDescendantsOfContainers(subtreeRoot, subtreeRoot);
while (descendant) {
if (descendant->isText()) {
if (localMultiplier != 1 && descendant->style()->textAutosizingMultiplier() == 1) {
setMultiplier(descendant, localMultiplier);
setMultiplier(descendant->parent(), localMultiplier); }
} else if (isAutosizingContainer(descendant)) {
RenderBlock* descendantBlock = toRenderBlock(descendant);
TextAutosizingClusterInfo descendantClusterInfo(descendantBlock);
if (isWiderDescendant(descendantBlock, clusterInfo) || isIndependentDescendant(descendantBlock))
processCluster(descendantClusterInfo, descendantBlock, descendantBlock, windowInfo);
else if (isNarrowDescendant(descendantBlock, clusterInfo)) {
clusterInfo.narrowDescendants.append(descendantClusterInfo);
} else
processContainer(multiplier, descendantBlock, clusterInfo, descendantBlock, windowInfo);
}
descendant = nextInPreOrderSkippingDescendantsOfContainers(descendant, subtreeRoot);
}
}
void TextAutosizer::setMultiplier(RenderObject* renderer, float multiplier)
{
RefPtr<RenderStyle> newStyle = RenderStyle::clone(renderer->style());
newStyle->setTextAutosizingMultiplier(multiplier);
renderer->setStyle(newStyle.release());
}
float TextAutosizer::computeAutosizedFontSize(float specifiedSize, float multiplier)
{
const float pleasantSize = 16;
const float gradientAfterPleasantSize = 0.5;
float computedSize;
if (specifiedSize <= pleasantSize)
computedSize = multiplier * specifiedSize;
else {
computedSize = multiplier * pleasantSize + gradientAfterPleasantSize * (specifiedSize - pleasantSize);
if (computedSize < specifiedSize)
computedSize = specifiedSize;
}
return computedSize;
}
bool TextAutosizer::isAutosizingContainer(const RenderObject* renderer)
{
if (!renderer->isRenderBlock() || (renderer->isInline() && !renderer->style()->isDisplayReplacedType()))
return false;
if (renderer->isListItem())
return renderer->isFloating() || renderer->isOutOfFlowPositioned();
Node* parentNode = renderer->parent() ? renderer->parent()->generatingNode() : 0;
if (parentNode && parentNode->isElementNode() && formInputTags().contains(toElement(parentNode)->tagQName()))
return false;
return true;
}
bool TextAutosizer::isNarrowDescendant(const RenderBlock* renderer, TextAutosizingClusterInfo& parentClusterInfo)
{
ASSERT(isAutosizingContainer(renderer));
const float differenceFromMaxWidthDifference = 50;
float contentWidth = renderer->contentLogicalWidth();
float clusterTextWidth = parentClusterInfo.blockContainingAllText->contentLogicalWidth();
float widthDifference = clusterTextWidth - contentWidth;
if (widthDifference - parentClusterInfo.maxAllowedDifferenceFromTextWidth > differenceFromMaxWidthDifference)
return true;
parentClusterInfo.maxAllowedDifferenceFromTextWidth = std::max(widthDifference, parentClusterInfo.maxAllowedDifferenceFromTextWidth);
return false;
}
bool TextAutosizer::isWiderDescendant(const RenderBlock* renderer, const TextAutosizingClusterInfo& parentClusterInfo)
{
ASSERT(isAutosizingContainer(renderer));
float contentWidth = renderer->contentLogicalWidth();
float clusterTextWidth = parentClusterInfo.blockContainingAllText->contentLogicalWidth();
return contentWidth > clusterTextWidth;
}
bool TextAutosizer::isIndependentDescendant(const RenderBlock* renderer)
{
ASSERT(isAutosizingContainer(renderer));
return renderer->isRenderView()
|| renderer->isFloating()
|| renderer->isOutOfFlowPositioned()
|| renderer->isTableCell()
|| renderer->isTableCaption()
|| renderer->isFlexibleBoxIncludingDeprecated()
|| renderer->hasColumns()
|| renderer->containingBlock()->isHorizontalWritingMode() != renderer->isHorizontalWritingMode()
|| renderer->style()->isDisplayReplacedType();
}
bool TextAutosizer::isAutosizingCluster(const RenderBlock* renderer, TextAutosizingClusterInfo& parentClusterInfo)
{
ASSERT(isAutosizingContainer(renderer));
return isNarrowDescendant(renderer, parentClusterInfo)
|| isWiderDescendant(renderer, parentClusterInfo)
|| isIndependentDescendant(renderer);
}
bool TextAutosizer::containerShouldBeAutosized(const RenderBlock* container)
{
if (containerContainsOneOfTags(container, formInputTags()))
return false;
if (containerIsRowOfLinks(container))
return false;
if (!container->style()->autoWrap())
return false;
return !contentHeightIsConstrained(container);
}
bool TextAutosizer::containerContainsOneOfTags(const RenderBlock* container, const Vector<QualifiedName>& tags)
{
const RenderObject* renderer = container;
while (renderer) {
const Node* rendererNode = renderer->node();
if (rendererNode && rendererNode->isElementNode()) {
if (tags.contains(toElement(rendererNode)->tagQName()))
return true;
}
renderer = nextInPreOrderSkippingDescendantsOfContainers(renderer, container);
}
return false;
}
bool TextAutosizer::containerIsRowOfLinks(const RenderObject* container)
{
int linkCount = 0;
RenderObject* renderer = container->nextInPreOrder(container);
float matchingFontSize = -1;
while (renderer) {
if (!isAutosizingContainer(renderer)) {
if (renderer->isText() && toRenderText(renderer)->text()->stripWhiteSpace()->length() > 3)
return false;
if (!renderer->isInline())
return false;
if (renderer->isBR())
return false;
}
if (renderer->style()->isLink()) {
if (matchingFontSize < 0)
matchingFontSize = renderer->style()->specifiedFontSize();
else {
if (matchingFontSize != renderer->style()->specifiedFontSize())
return false;
}
linkCount++;
renderer = renderer->nextInPreOrderAfterChildren(container);
} else
renderer = nextInPreOrderSkippingDescendantsOfContainers(renderer, container);
}
return (linkCount >= 3);
}
bool TextAutosizer::contentHeightIsConstrained(const RenderBlock* container)
{
for (; container; container = container->containingBlock()) {
RenderStyle* style = container->style();
if (style->overflowY() >= OSCROLL)
return false;
if (style->height().isSpecified() || style->maxHeight().isSpecified()) {
return !container->isRoot() && !container->isBody();
}
if (container->isFloatingOrOutOfFlowPositioned())
return false;
}
return false;
}
bool TextAutosizer::clusterShouldBeAutosized(TextAutosizingClusterInfo& clusterInfo, float blockWidth)
{
Vector<TextAutosizingClusterInfo> clusterInfos(1, clusterInfo);
return compositeClusterShouldBeAutosized(clusterInfos, blockWidth);
}
bool TextAutosizer::compositeClusterShouldBeAutosized(Vector<TextAutosizingClusterInfo>& clusterInfos, float blockWidth)
{
float totalTextWidth = 0;
const float minLinesOfText = 4;
float minTextWidth = blockWidth * minLinesOfText;
for (size_t i = 0; i < clusterInfos.size(); ++i) {
measureDescendantTextWidth(clusterInfos[i].blockContainingAllText, clusterInfos[i], minTextWidth, totalTextWidth);
if (totalTextWidth >= minTextWidth)
return true;
}
return false;
}
void TextAutosizer::measureDescendantTextWidth(const RenderBlock* container, TextAutosizingClusterInfo& clusterInfo, float minTextWidth, float& textWidth)
{
bool skipLocalText = !containerShouldBeAutosized(container);
RenderObject* descendant = nextInPreOrderSkippingDescendantsOfContainers(container, container);
while (descendant) {
if (!skipLocalText && descendant->isText()) {
textWidth += toRenderText(descendant)->renderedTextLength() * descendant->style()->specifiedFontSize();
} else if (isAutosizingContainer(descendant)) {
RenderBlock* descendantBlock = toRenderBlock(descendant);
if (!isAutosizingCluster(descendantBlock, clusterInfo))
measureDescendantTextWidth(descendantBlock, clusterInfo, minTextWidth, textWidth);
}
if (textWidth >= minTextWidth)
return;
descendant = nextInPreOrderSkippingDescendantsOfContainers(descendant, container);
}
}
RenderObject* TextAutosizer::nextInPreOrderSkippingDescendantsOfContainers(const RenderObject* current, const RenderObject* stayWithin)
{
if (current == stayWithin || !isAutosizingContainer(current))
return current->nextInPreOrder(stayWithin);
return current->nextInPreOrderAfterChildren(stayWithin);
}
const RenderBlock* TextAutosizer::findDeepestBlockContainingAllText(const RenderBlock* cluster)
{
size_t firstDepth = 0;
const RenderObject* firstTextLeaf = findFirstTextLeafNotInCluster(cluster, firstDepth, FirstToLast);
if (!firstTextLeaf)
return cluster;
size_t lastDepth = 0;
const RenderObject* lastTextLeaf = findFirstTextLeafNotInCluster(cluster, lastDepth, LastToFirst);
ASSERT(lastTextLeaf);
const RenderObject* firstNode = firstTextLeaf;
const RenderObject* lastNode = lastTextLeaf;
while (firstDepth > lastDepth) {
firstNode = firstNode->parent();
--firstDepth;
}
while (lastDepth > firstDepth) {
lastNode = lastNode->parent();
--lastDepth;
}
while (firstNode != lastNode) {
firstNode = firstNode->parent();
lastNode = lastNode->parent();
}
if (firstNode->isRenderBlock())
return toRenderBlock(firstNode);
RenderBlock* containingBlock = firstNode->containingBlock();
ASSERT(containingBlock->isDescendantOf(cluster));
return containingBlock;
}
const RenderObject* TextAutosizer::findFirstTextLeafNotInCluster(const RenderObject* parent, size_t& depth, TraversalDirection direction)
{
if (parent->isEmpty())
return parent->isText() ? parent : 0;
++depth;
const RenderObject* child = (direction == FirstToLast) ? parent->firstChild() : parent->lastChild();
while (child) {
if (!isAutosizingContainer(child) || !isIndependentDescendant(toRenderBlock(child))) {
const RenderObject* leaf = findFirstTextLeafNotInCluster(child, depth, direction);
if (leaf)
return leaf;
}
child = (direction == FirstToLast) ? child->nextSibling() : child->previousSibling();
}
--depth;
return 0;
}
namespace {
bool clusterWiderThanComparisonFn(const TextAutosizingClusterInfo& first, const TextAutosizingClusterInfo& second)
{
return first.root->contentLogicalWidth() > second.root->contentLogicalWidth();
}
}
void TextAutosizer::getNarrowDescendantsGroupedByWidth(const TextAutosizingClusterInfo& parentClusterInfo, Vector<Vector<TextAutosizingClusterInfo> >& groups)
{
ASSERT(parentClusterInfo.blockContainingAllText);
ASSERT(groups.isEmpty());
Vector<TextAutosizingClusterInfo> clusterInfos(parentClusterInfo.narrowDescendants);
if (clusterInfos.isEmpty())
return;
std::sort(clusterInfos.begin(), clusterInfos.end(), &clusterWiderThanComparisonFn);
groups.grow(1);
const float maxWidthDifferenceWithinGroup = 100;
for (size_t i = 0; i < clusterInfos.size(); ++i) {
groups.last().append(clusterInfos[i]);
if (i + 1 < clusterInfos.size()) {
float currentWidth = clusterInfos[i].root->contentLogicalWidth();
float nextWidth = clusterInfos[i + 1].root->contentLogicalWidth();
if (currentWidth - nextWidth > maxWidthDifferenceWithinGroup)
groups.grow(groups.size() + 1);
}
}
}
}
#endif // ENABLE(TEXT_AUTOSIZING)