diff -r 000000000000 -r 4f2f89ce4247 WebCore/editing/InsertTextCommand.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/WebCore/editing/InsertTextCommand.cpp Fri Sep 17 09:02:29 2010 +0300 @@ -0,0 +1,261 @@ +/* + * Copyright (C) 2005 Apple Computer, 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 COMPUTER, INC. ``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 COMPUTER, INC. OR + * 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. + */ + +#include "config.h" +#include "InsertTextCommand.h" + +#include "CharacterNames.h" +#include "CSSComputedStyleDeclaration.h" +#include "CSSMutableStyleDeclaration.h" +#include "CSSPropertyNames.h" +#include "Document.h" +#include "Element.h" +#include "EditingText.h" +#include "Editor.h" +#include "Frame.h" +#include "Logging.h" +#include "HTMLInterchange.h" +#include "htmlediting.h" +#include "TextIterator.h" +#include "TypingCommand.h" +#include "visible_units.h" + +namespace WebCore { + +InsertTextCommand::InsertTextCommand(Document *document) + : CompositeEditCommand(document), m_charactersAdded(0) +{ +} + +void InsertTextCommand::doApply() +{ +} + +Position InsertTextCommand::prepareForTextInsertion(const Position& p) +{ + Position pos = p; + // Prepare for text input by looking at the specified position. + // It may be necessary to insert a text node to receive characters. + if (!pos.node()->isTextNode()) { + RefPtr textNode = document()->createEditingTextNode(""); + insertNodeAt(textNode.get(), pos); + return Position(textNode.get(), 0); + } + + if (isTabSpanTextNode(pos.node())) { + RefPtr textNode = document()->createEditingTextNode(""); + insertNodeAtTabSpanPosition(textNode.get(), pos); + return Position(textNode.get(), 0); + } + + return pos; +} + +// This avoids the expense of a full fledged delete operation, and avoids a layout that typically results +// from text removal. +bool InsertTextCommand::performTrivialReplace(const String& text, bool selectInsertedText) +{ + if (!endingSelection().isRange()) + return false; + + if (text.contains('\t') || text.contains(' ') || text.contains('\n')) + return false; + + Position start = endingSelection().start(); + Position end = endingSelection().end(); + + if (start.node() != end.node() || !start.node()->isTextNode() || isTabSpanTextNode(start.node())) + return false; + + replaceTextInNode(static_cast(start.node()), start.deprecatedEditingOffset(), end.deprecatedEditingOffset() - start.deprecatedEditingOffset(), text); + + Position endPosition(start.node(), start.deprecatedEditingOffset() + text.length()); + + // We could have inserted a part of composed character sequence, + // so we are basically treating ending selection as a range to avoid validation. + // + VisibleSelection forcedEndingSelection; + forcedEndingSelection.setWithoutValidation(start, endPosition); + setEndingSelection(forcedEndingSelection); + + if (!selectInsertedText) + setEndingSelection(VisibleSelection(endingSelection().visibleEnd())); + + return true; +} + +void InsertTextCommand::input(const String& text, bool selectInsertedText) +{ + + ASSERT(text.find('\n') == -1); + + if (endingSelection().isNone()) + return; + + // Delete the current selection. + // FIXME: This delete operation blows away the typing style. + if (endingSelection().isRange()) { + if (performTrivialReplace(text, selectInsertedText)) + return; + deleteSelection(false, true, true, false); + } + + Position startPosition(endingSelection().start()); + + Position placeholder; + // We want to remove preserved newlines and brs that will collapse (and thus become unnecessary) when content + // is inserted just before them. + // FIXME: We shouldn't really have to do this, but removing placeholders is a workaround for 9661. + // If the caret is just before a placeholder, downstream will normalize the caret to it. + Position downstream(startPosition.downstream()); + if (lineBreakExistsAtPosition(downstream)) { + // FIXME: This doesn't handle placeholders at the end of anonymous blocks. + VisiblePosition caret(startPosition); + if (isEndOfBlock(caret) && isStartOfParagraph(caret)) + placeholder = downstream; + // Don't remove the placeholder yet, otherwise the block we're inserting into would collapse before + // we get a chance to insert into it. We check for a placeholder now, though, because doing so requires + // the creation of a VisiblePosition, and if we did that post-insertion it would force a layout. + } + + // Insert the character at the leftmost candidate. + startPosition = startPosition.upstream(); + + // It is possible for the node that contains startPosition to contain only unrendered whitespace, + // and so deleteInsignificantText could remove it. Save the position before the node in case that happens. + Position positionBeforeStartNode(positionInParentBeforeNode(startPosition.node())); + deleteInsignificantText(startPosition.upstream(), startPosition.downstream()); + if (!startPosition.node()->inDocument()) + startPosition = positionBeforeStartNode; + if (!startPosition.isCandidate()) + startPosition = startPosition.downstream(); + + startPosition = positionAvoidingSpecialElementBoundary(startPosition); + + Position endPosition; + + if (text == "\t") { + endPosition = insertTab(startPosition); + startPosition = endPosition.previous(); + if (placeholder.isNotNull()) + removePlaceholderAt(placeholder); + m_charactersAdded += 1; + } else { + // Make sure the document is set up to receive text + startPosition = prepareForTextInsertion(startPosition); + if (placeholder.isNotNull()) + removePlaceholderAt(placeholder); + Text *textNode = static_cast(startPosition.node()); + int offset = startPosition.deprecatedEditingOffset(); + + insertTextIntoNode(textNode, offset, text); + endPosition = Position(textNode, offset + text.length()); + + // The insertion may require adjusting adjacent whitespace, if it is present. + rebalanceWhitespaceAt(endPosition); + // Rebalancing on both sides isn't necessary if we've inserted a space. + if (text != " ") + rebalanceWhitespaceAt(startPosition); + + m_charactersAdded += text.length(); + } + + // We could have inserted a part of composed character sequence, + // so we are basically treating ending selection as a range to avoid validation. + // + VisibleSelection forcedEndingSelection; + forcedEndingSelection.setWithoutValidation(startPosition, endPosition); + setEndingSelection(forcedEndingSelection); + + // Handle the case where there is a typing style. + CSSMutableStyleDeclaration* typingStyle = document()->frame()->typingStyle(); + RefPtr endingStyle = endPosition.computedStyle(); + RefPtr unicodeBidi; + RefPtr direction; + if (typingStyle) { + unicodeBidi = typingStyle->getPropertyCSSValue(CSSPropertyUnicodeBidi); + direction = typingStyle->getPropertyCSSValue(CSSPropertyDirection); + } + endingStyle->diff(typingStyle); + if (typingStyle && unicodeBidi) { + ASSERT(unicodeBidi->isPrimitiveValue()); + typingStyle->setProperty(CSSPropertyUnicodeBidi, static_cast(unicodeBidi.get())->getIdent()); + if (direction) { + ASSERT(direction->isPrimitiveValue()); + typingStyle->setProperty(CSSPropertyDirection, static_cast(direction.get())->getIdent()); + } + } + + if (typingStyle && typingStyle->length()) + applyStyle(typingStyle); + + if (!selectInsertedText) + setEndingSelection(VisibleSelection(endingSelection().end(), endingSelection().affinity())); +} + +Position InsertTextCommand::insertTab(const Position& pos) +{ + Position insertPos = VisiblePosition(pos, DOWNSTREAM).deepEquivalent(); + + Node *node = insertPos.node(); + unsigned int offset = insertPos.deprecatedEditingOffset(); + + // keep tabs coalesced in tab span + if (isTabSpanTextNode(node)) { + insertTextIntoNode(static_cast(node), offset, "\t"); + return Position(node, offset + 1); + } + + // create new tab span + RefPtr spanNode = createTabSpanElement(document()); + + // place it + if (!node->isTextNode()) { + insertNodeAt(spanNode.get(), insertPos); + } else { + Text *textNode = static_cast(node); + if (offset >= textNode->length()) { + insertNodeAfter(spanNode.get(), textNode); + } else { + // split node to make room for the span + // NOTE: splitTextNode uses textNode for the + // second node in the split, so we need to + // insert the span before it. + if (offset > 0) + splitTextNode(textNode, offset); + insertNodeBefore(spanNode, textNode); + } + } + + // return the position following the new tab + return Position(spanNode->lastChild(), caretMaxOffset(spanNode->lastChild())); +} + +bool InsertTextCommand::isInsertTextCommand() const +{ + return true; +} + +}