1 /* 2 * Copyright (C) 2009 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "config.h" 32 33 #if ENABLE(RUBY) 34 #include "RenderRubyBase.h" 35 36 namespace WebCore { 37 38 RenderRubyBase::RenderRubyBase(Node* node) 39 : RenderBlock(node) 40 { 41 setInline(false); 42 } 43 44 RenderRubyBase::~RenderRubyBase() 45 { 46 } 47 48 bool RenderRubyBase::isChildAllowed(RenderObject* child, RenderStyle*) const 49 { 50 return child->isInline(); 51 } 52 53 bool RenderRubyBase::hasOnlyWrappedInlineChildren(RenderObject* beforeChild) const 54 { 55 // Tests whether all children in the base before beforeChild are either floated/positioned, 56 // or inline objects wrapped in anonymous blocks. 57 // Note that beforeChild may be 0, in which case all children are looked at. 58 for (RenderObject* child = firstChild(); child != beforeChild; child = child->nextSibling()) { 59 if (!child->isFloatingOrPositioned() && !(child->isAnonymousBlock() && child->childrenInline())) 60 return false; 61 } 62 return true; 63 } 64 65 void RenderRubyBase::moveChildren(RenderRubyBase* toBase, RenderObject* fromBeforeChild) 66 { 67 // This function removes all children that are before (!) beforeChild 68 // and appends them to toBase. 69 ASSERT(toBase); 70 71 // First make sure that beforeChild (if set) is indeed a direct child of this. 72 // Inline children might be wrapped in an anonymous block if there's a continuation. 73 // Theoretically, in ruby bases, this can happen with only the first such a child, 74 // so it should be OK to just climb the tree. 75 while (fromBeforeChild && fromBeforeChild->parent() != this) 76 fromBeforeChild = fromBeforeChild->parent(); 77 78 if (childrenInline()) 79 moveInlineChildren(toBase, fromBeforeChild); 80 else 81 moveBlockChildren(toBase, fromBeforeChild); 82 83 setNeedsLayoutAndPrefWidthsRecalc(); 84 toBase->setNeedsLayoutAndPrefWidthsRecalc(); 85 } 86 87 void RenderRubyBase::moveInlineChildren(RenderRubyBase* toBase, RenderObject* fromBeforeChild) 88 { 89 RenderBlock* toBlock; 90 91 if (toBase->childrenInline()) { 92 // The standard and easy case: move the children into the target base 93 toBlock = toBase; 94 } else { 95 // We need to wrap the inline objects into an anonymous block. 96 // If toBase has a suitable block, we re-use it, otherwise create a new one. 97 RenderObject* lastChild = toBase->lastChild(); 98 if (lastChild && lastChild->isAnonymousBlock() && lastChild->childrenInline()) 99 toBlock = toRenderBlock(lastChild); 100 else { 101 toBlock = toBase->createAnonymousBlock(); 102 toBase->children()->appendChildNode(toBase, toBlock); 103 } 104 } 105 // Move our inline children into the target block we determined above. 106 for (RenderObject* child = firstChild(); child != fromBeforeChild; child = firstChild()) 107 moveChildTo(toBlock, toBlock->children(), child); 108 } 109 110 void RenderRubyBase::moveBlockChildren(RenderRubyBase* toBase, RenderObject* fromBeforeChild) 111 { 112 if (toBase->childrenInline()) { 113 // First check whether we move only wrapped inline objects. 114 if (hasOnlyWrappedInlineChildren(fromBeforeChild)) { 115 // The reason why the base is in block flow must be after beforeChild. 116 // We therefore can extract the inline objects and move them to toBase. 117 for (RenderObject* child = firstChild(); child != fromBeforeChild; child = firstChild()) { 118 if (child->isAnonymousBlock()) { 119 RenderBlock* anonBlock = toRenderBlock(child); 120 ASSERT(anonBlock->childrenInline()); 121 ASSERT(!anonBlock->inlineContinuation()); 122 anonBlock->moveAllChildrenTo(toBase, toBase->children()); 123 anonBlock->deleteLineBoxTree(); 124 anonBlock->destroy(); 125 } else { 126 ASSERT(child->isFloatingOrPositioned()); 127 moveChildTo(toBase, toBase->children(), child); 128 } 129 } 130 } else { 131 // Moving block children -> have to set toBase as block flow 132 toBase->makeChildrenNonInline(); 133 // Move children, potentially collapsing anonymous block wrappers. 134 mergeBlockChildren(toBase, fromBeforeChild); 135 136 // Now we need to check if the leftover children are all inline. 137 // If so, make this base inline again. 138 if (hasOnlyWrappedInlineChildren()) { 139 RenderObject* next = 0; 140 for (RenderObject* child = firstChild(); child; child = next) { 141 next = child->nextSibling(); 142 if (child->isFloatingOrPositioned()) 143 continue; 144 ASSERT(child->isAnonymousBlock()); 145 146 RenderBlock* anonBlock = toRenderBlock(child); 147 ASSERT(anonBlock->childrenInline()); 148 ASSERT(!anonBlock->inlineContinuation()); 149 // Move inline children out of anonymous block. 150 anonBlock->moveAllChildrenTo(this, children(), anonBlock); 151 anonBlock->deleteLineBoxTree(); 152 anonBlock->destroy(); 153 } 154 setChildrenInline(true); 155 } 156 } 157 } else 158 mergeBlockChildren(toBase, fromBeforeChild); 159 } 160 161 void RenderRubyBase::mergeBlockChildren(RenderRubyBase* toBase, RenderObject* fromBeforeChild) 162 { 163 // This function removes all children that are before fromBeforeChild and appends them to toBase. 164 ASSERT(!childrenInline()); 165 ASSERT(toBase); 166 ASSERT(!toBase->childrenInline()); 167 168 // Quick check whether we have anything to do, to simplify the following code. 169 if (fromBeforeChild != firstChild()) 170 return; 171 172 // If an anonymous block would be put next to another such block, then merge those. 173 RenderObject* firstChildHere = firstChild(); 174 RenderObject* lastChildThere = toBase->lastChild(); 175 if (firstChildHere && firstChildHere->isAnonymousBlock() && firstChildHere->childrenInline() 176 && lastChildThere && lastChildThere->isAnonymousBlock() && lastChildThere->childrenInline()) { 177 RenderBlock* anonBlockHere = toRenderBlock(firstChildHere); 178 RenderBlock* anonBlockThere = toRenderBlock(lastChildThere); 179 anonBlockHere->moveAllChildrenTo(anonBlockThere, anonBlockThere->children()); 180 anonBlockHere->deleteLineBoxTree(); 181 anonBlockHere->destroy(); 182 } 183 // Move all remaining children normally. 184 for (RenderObject* child = firstChild(); child != fromBeforeChild; child = firstChild()) 185 moveChildTo(toBase, toBase->children(), child); 186 } 187 188 } // namespace WebCore 189 190 #endif 191
