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      1 /*
      2  * Copyright (C) 2006 Apple Computer, 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/editing/FormatBlockCommand.h"
     28 
     29 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
     30 #include "core/HTMLNames.h"
     31 #include "core/dom/Element.h"
     32 #include "core/dom/Range.h"
     33 #include "core/editing/VisibleUnits.h"
     34 #include "core/editing/htmlediting.h"
     35 #include "core/html/HTMLBRElement.h"
     36 #include "core/html/HTMLElement.h"
     37 
     38 namespace blink {
     39 
     40 using namespace HTMLNames;
     41 
     42 static Node* enclosingBlockToSplitTreeTo(Node* startNode);
     43 static bool isElementForFormatBlock(const QualifiedName& tagName);
     44 static inline bool isElementForFormatBlock(Node* node)
     45 {
     46     return node->isElementNode() && isElementForFormatBlock(toElement(node)->tagQName());
     47 }
     48 
     49 FormatBlockCommand::FormatBlockCommand(Document& document, const QualifiedName& tagName)
     50     : ApplyBlockElementCommand(document, tagName)
     51     , m_didApply(false)
     52 {
     53 }
     54 
     55 void FormatBlockCommand::formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection)
     56 {
     57     if (!isElementForFormatBlock(tagName()))
     58         return;
     59     ApplyBlockElementCommand::formatSelection(startOfSelection, endOfSelection);
     60     m_didApply = true;
     61 }
     62 
     63 void FormatBlockCommand::formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtrWillBeRawPtr<HTMLElement>& blockElement)
     64 {
     65     Element* refElement = enclosingBlockFlowElement(VisiblePosition(end));
     66     Element* root = editableRootForPosition(start);
     67     // Root is null for elements with contenteditable=false.
     68     if (!root || !refElement)
     69         return;
     70 
     71     Node* nodeToSplitTo = enclosingBlockToSplitTreeTo(start.deprecatedNode());
     72     RefPtrWillBeRawPtr<Node> outerBlock = (start.deprecatedNode() == nodeToSplitTo) ? start.deprecatedNode() : splitTreeToNode(start.deprecatedNode(), nodeToSplitTo).get();
     73     RefPtrWillBeRawPtr<Node> nodeAfterInsertionPosition = outerBlock;
     74     RefPtrWillBeRawPtr<Range> range = Range::create(document(), start, endOfSelection);
     75 
     76     if (isElementForFormatBlock(refElement->tagQName()) && VisiblePosition(start) == startOfBlock(VisiblePosition(start))
     77         && (VisiblePosition(end) == endOfBlock(VisiblePosition(end)) || isNodeVisiblyContainedWithin(*refElement, *range))
     78         && refElement != root && !root->isDescendantOf(refElement)) {
     79         // Already in a block element that only contains the current paragraph
     80         if (refElement->hasTagName(tagName()))
     81             return;
     82         nodeAfterInsertionPosition = refElement;
     83     }
     84 
     85     if (!blockElement) {
     86         // Create a new blockquote and insert it as a child of the root editable element. We accomplish
     87         // this by splitting all parents of the current paragraph up to that point.
     88         blockElement = createBlockElement();
     89         insertNodeBefore(blockElement, nodeAfterInsertionPosition);
     90     }
     91 
     92     Position lastParagraphInBlockNode = blockElement->lastChild() ? positionAfterNode(blockElement->lastChild()) : Position();
     93     bool wasEndOfParagraph = isEndOfParagraph(VisiblePosition(lastParagraphInBlockNode));
     94 
     95     moveParagraphWithClones(VisiblePosition(start), VisiblePosition(end), blockElement.get(), outerBlock.get());
     96 
     97     // Copy the inline style of the original block element to the newly created block-style element.
     98     if (outerBlock.get() != nodeAfterInsertionPosition.get() && toHTMLElement(nodeAfterInsertionPosition.get())->hasAttribute(styleAttr))
     99         blockElement->setAttribute(styleAttr, toHTMLElement(nodeAfterInsertionPosition.get())->getAttribute(styleAttr));
    100 
    101     if (wasEndOfParagraph && !isEndOfParagraph(VisiblePosition(lastParagraphInBlockNode)) && !isStartOfParagraph(VisiblePosition(lastParagraphInBlockNode)))
    102         insertBlockPlaceholder(lastParagraphInBlockNode);
    103 }
    104 
    105 Element* FormatBlockCommand::elementForFormatBlockCommand(Range* range)
    106 {
    107     if (!range)
    108         return 0;
    109 
    110     Node* commonAncestor = range->commonAncestorContainer();
    111     while (commonAncestor && !isElementForFormatBlock(commonAncestor))
    112         commonAncestor = commonAncestor->parentNode();
    113 
    114     if (!commonAncestor)
    115         return 0;
    116 
    117     Element* rootEditableElement = range->startContainer()->rootEditableElement();
    118     if (!rootEditableElement || commonAncestor->contains(rootEditableElement))
    119         return 0;
    120 
    121     return commonAncestor->isElementNode() ? toElement(commonAncestor) : 0;
    122 }
    123 
    124 bool isElementForFormatBlock(const QualifiedName& tagName)
    125 {
    126     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, blockTags, ());
    127     if (blockTags.isEmpty()) {
    128         blockTags.add(addressTag);
    129         blockTags.add(articleTag);
    130         blockTags.add(asideTag);
    131         blockTags.add(blockquoteTag);
    132         blockTags.add(ddTag);
    133         blockTags.add(divTag);
    134         blockTags.add(dlTag);
    135         blockTags.add(dtTag);
    136         blockTags.add(footerTag);
    137         blockTags.add(h1Tag);
    138         blockTags.add(h2Tag);
    139         blockTags.add(h3Tag);
    140         blockTags.add(h4Tag);
    141         blockTags.add(h5Tag);
    142         blockTags.add(h6Tag);
    143         blockTags.add(headerTag);
    144         blockTags.add(hgroupTag);
    145         blockTags.add(mainTag);
    146         blockTags.add(navTag);
    147         blockTags.add(pTag);
    148         blockTags.add(preTag);
    149         blockTags.add(sectionTag);
    150     }
    151     return blockTags.contains(tagName);
    152 }
    153 
    154 Node* enclosingBlockToSplitTreeTo(Node* startNode)
    155 {
    156     Node* lastBlock = startNode;
    157     for (Node* n = startNode; n; n = n->parentNode()) {
    158         if (!n->hasEditableStyle())
    159             return lastBlock;
    160         if (isTableCell(n) || isHTMLBodyElement(*n) || !n->parentNode() || !n->parentNode()->hasEditableStyle() || isElementForFormatBlock(n))
    161             return n;
    162         if (isBlock(n))
    163             lastBlock = n;
    164         if (isHTMLListElement(n))
    165             return n->parentNode()->hasEditableStyle() ? n->parentNode() : n;
    166     }
    167     return lastBlock;
    168 }
    169 
    170 }
    171