code.vuplus.com Git - vuplus_webkit/blob - Source/WebCore/rendering/RenderRubyBase.cpp

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  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
  13  * distribution.
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  30
  31 #include "config.h"
  32
  33 #include "RenderRubyBase.h"
  34 #include "RenderRubyRun.h"
  35 #include "RenderRubyText.h"
  36
  37 using namespace std;
  38
  39 namespace WebCore {
  40
  41 RenderRubyBase::RenderRubyBase(Node* node)
  42     : RenderBlock(node)
  43 {
  44     setInline(false);
  45 }
  46
  47 RenderRubyBase::~RenderRubyBase()
  48 {
  49 }
  50
  51 bool RenderRubyBase::isChildAllowed(RenderObject* child, RenderStyle*) const
  52 {
  53     return child->isInline();
  54 }
  55
  56 bool RenderRubyBase::hasOnlyWrappedInlineChildren(RenderObject* beforeChild) const
  57 {
  58     // Tests whether all children in the base before beforeChild are either floated/positioned,
  59     // or inline objects wrapped in anonymous blocks.
  60     // Note that beforeChild may be 0, in which case all children are looked at.
  61     for (RenderObject* child = firstChild(); child != beforeChild; child = child->nextSibling()) {
  62         if (!child->isFloatingOrPositioned() && !(child->isAnonymousBlock() && child->childrenInline()))
  63             return false;
  64     }
  65     return true;
  66 }
  67
  68 void RenderRubyBase::moveChildren(RenderRubyBase* toBase, RenderObject* fromBeforeChild)
  69 {
  70     // This function removes all children that are before (!) beforeChild
  71     // and appends them to toBase.
  72     ASSERT(toBase);
  73
  74     // First make sure that beforeChild (if set) is indeed a direct child of this.
  75     // Inline children might be wrapped in an anonymous block if there's a continuation.
  76     // Theoretically, in ruby bases, this can happen with only the first such a child,
  77     // so it should be OK to just climb the tree.
  78     while (fromBeforeChild && fromBeforeChild->parent() != this)
  79         fromBeforeChild = fromBeforeChild->parent();
  80
  81     if (childrenInline())
  82         moveInlineChildren(toBase, fromBeforeChild);
  83     else
  84         moveBlockChildren(toBase, fromBeforeChild);
  85
  86     setNeedsLayoutAndPrefWidthsRecalc();
  87     toBase->setNeedsLayoutAndPrefWidthsRecalc();
  88 }
  89
  90 void RenderRubyBase::moveInlineChildren(RenderRubyBase* toBase, RenderObject* fromBeforeChild)
  91 {
  92     RenderBlock* toBlock;
  93
  94     if (toBase->childrenInline()) {
  95         // The standard and easy case: move the children into the target base
  96         toBlock = toBase;
  97     } else {
  98         // We need to wrap the inline objects into an anonymous block.
  99         // If toBase has a suitable block, we re-use it, otherwise create a new one.
 100         RenderObject* lastChild = toBase->lastChild();
 101         if (lastChild && lastChild->isAnonymousBlock() && lastChild->childrenInline())
 102             toBlock = toRenderBlock(lastChild);
 103         else {
 104             toBlock = toBase->createAnonymousBlock();
 105             toBase->children()->appendChildNode(toBase, toBlock);
 106         }
 107     }
 108     // Move our inline children into the target block we determined above.
 109     moveChildrenTo(toBlock, firstChild(), fromBeforeChild);
 110 }
 111
 112 void RenderRubyBase::moveBlockChildren(RenderRubyBase* toBase, RenderObject* fromBeforeChild)
 113 {
 114     if (toBase->childrenInline()) {
 115         // First check whether we move only wrapped inline objects.
 116         if (hasOnlyWrappedInlineChildren(fromBeforeChild)) {
 117             // The reason why the base is in block flow must be after beforeChild.
 118             // We therefore can extract the inline objects and move them to toBase.
 119             for (RenderObject* child = firstChild(); child != fromBeforeChild; child = firstChild()) {
 120                 if (child->isAnonymousBlock()) {
 121                     RenderBlock* anonBlock = toRenderBlock(child);
 122                     ASSERT(anonBlock->childrenInline());
 123                     ASSERT(!anonBlock->inlineElementContinuation());
 124                     anonBlock->moveAllChildrenTo(toBase, toBase->children());
 125                     anonBlock->deleteLineBoxTree();
 126                     anonBlock->destroy();
 127                 } else {
 128                     ASSERT(child->isFloatingOrPositioned());
 129                     moveChildTo(toBase, child);
 130                 }
 131             }
 132         } else {
 133             // Moving block children -> have to set toBase as block flow
 134             toBase->makeChildrenNonInline();
 135             // Move children, potentially collapsing anonymous block wrappers.
 136             mergeBlockChildren(toBase, fromBeforeChild);
 137
 138             // Now we need to check if the leftover children are all inline.
 139             // If so, make this base inline again.
 140             if (hasOnlyWrappedInlineChildren()) {
 141                 RenderObject* next = 0;
 142                 for (RenderObject* child = firstChild(); child; child = next) {
 143                     next = child->nextSibling();
 144                     if (child->isFloatingOrPositioned())
 145                         continue;
 146                     ASSERT(child->isAnonymousBlock());
 147
 148                     RenderBlock* anonBlock = toRenderBlock(child);
 149                     ASSERT(anonBlock->childrenInline());
 150                     ASSERT(!anonBlock->inlineElementContinuation());
 151                     // Move inline children out of anonymous block.
 152                     anonBlock->moveAllChildrenTo(this, anonBlock);
 153                     anonBlock->deleteLineBoxTree();
 154                     anonBlock->destroy();
 155                 }
 156                 setChildrenInline(true);
 157             }
 158         }
 159     } else
 160         mergeBlockChildren(toBase, fromBeforeChild);
 161 }
 162
 163 void RenderRubyBase::mergeBlockChildren(RenderRubyBase* toBase, RenderObject* fromBeforeChild)
 164 {
 165     // This function removes all children that are before fromBeforeChild and appends them to toBase.
 166     ASSERT(!childrenInline());
 167     ASSERT(toBase);
 168     ASSERT(!toBase->childrenInline());
 169
 170     // Quick check whether we have anything to do, to simplify the following code.
 171     if (fromBeforeChild != firstChild())
 172         return;
 173
 174     // If an anonymous block would be put next to another such block, then merge those.
 175     RenderObject* firstChildHere = firstChild();
 176     RenderObject* lastChildThere = toBase->lastChild();
 177     if (firstChildHere && firstChildHere->isAnonymousBlock() && firstChildHere->childrenInline()
 178             && lastChildThere && lastChildThere->isAnonymousBlock() && lastChildThere->childrenInline()) {
 179         RenderBlock* anonBlockHere = toRenderBlock(firstChildHere);
 180         RenderBlock* anonBlockThere = toRenderBlock(lastChildThere);
 181         anonBlockHere->moveAllChildrenTo(anonBlockThere, anonBlockThere->children());
 182         anonBlockHere->deleteLineBoxTree();
 183         anonBlockHere->destroy();
 184     }
 185     // Move all remaining children normally.
 186     moveChildrenTo(toBase, firstChild(), fromBeforeChild);
 187 }
 188
 189 RenderRubyRun* RenderRubyBase::rubyRun() const
 190 {
 191     ASSERT(parent());
 192     ASSERT(parent()->isRubyRun());
 193
 194     return toRenderRubyRun(parent());
 195 }
 196
 197 ETextAlign RenderRubyBase::textAlignmentForLine(bool /* endsWithSoftBreak */) const
 198 {
 199     return JUSTIFY;
 200 }
 201
 202 void RenderRubyBase::adjustInlineDirectionLineBounds(int expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const
 203 {
 204     int maxPreferredLogicalWidth = this->maxPreferredLogicalWidth();
 205     if (maxPreferredLogicalWidth >= logicalWidth)
 206         return;
 207
 208     // Inset the ruby base by half the inter-ideograph expansion amount.
 209     float inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);
 210
 211     logicalLeft += inset / 2;
 212     logicalWidth -= inset;
 213 }
 214
 215 } // namespace WebCore