166 lines
7.5 KiB
C++
166 lines
7.5 KiB
C++
/*
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* Copyright (C) 2005, 2006 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "InsertLineBreakCommand.h"
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#include "Document.h"
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#include "Editing.h"
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#include "Frame.h"
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#include "FrameSelection.h"
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#include "HTMLBRElement.h"
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#include "HTMLHRElement.h"
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#include "HTMLNames.h"
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#include "HTMLTableElement.h"
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#include "RenderElement.h"
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#include "RenderText.h"
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#include "Text.h"
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#include "VisibleUnits.h"
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namespace WebCore {
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using namespace HTMLNames;
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InsertLineBreakCommand::InsertLineBreakCommand(Document& document)
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: CompositeEditCommand(document)
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{
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}
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bool InsertLineBreakCommand::preservesTypingStyle() const
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{
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return true;
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}
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// Whether we should insert a break element or a '\n'.
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bool InsertLineBreakCommand::shouldUseBreakElement(const Position& position)
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{
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// An editing position like [input, 0] actually refers to the position before
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// the input element, and in that case we need to check the input element's
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// parent's renderer.
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auto* node = position.parentAnchoredEquivalent().deprecatedNode();
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return node->renderer() && !node->renderer()->style().preserveNewline();
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}
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void InsertLineBreakCommand::doApply()
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{
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deleteSelection();
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VisibleSelection selection = endingSelection();
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if (selection.isNoneOrOrphaned())
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return;
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VisiblePosition caret(selection.visibleStart());
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// FIXME: If the node is hidden, we should still be able to insert text.
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// For now, we return to avoid a crash. https://bugs.webkit.org/show_bug.cgi?id=40342
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if (caret.isNull())
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return;
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Position position(caret.deepEquivalent());
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position = positionAvoidingSpecialElementBoundary(position);
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position = positionOutsideTabSpan(position);
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RefPtr<Node> nodeToInsert;
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if (shouldUseBreakElement(position))
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nodeToInsert = HTMLBRElement::create(document());
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else
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nodeToInsert = document().createTextNode("\n");
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// FIXME: Need to merge text nodes when inserting just after or before text.
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if (isEndOfParagraph(caret) && !lineBreakExistsAtVisiblePosition(caret)) {
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bool needExtraLineBreak = !is<HTMLHRElement>(*position.deprecatedNode()) && !is<HTMLTableElement>(*position.deprecatedNode());
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insertNodeAt(*nodeToInsert, position);
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if (needExtraLineBreak)
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insertNodeBefore(nodeToInsert->cloneNode(false), *nodeToInsert);
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VisiblePosition endingPosition(positionBeforeNode(nodeToInsert.get()));
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setEndingSelection(VisibleSelection(endingPosition, endingSelection().isDirectional()));
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} else if (position.deprecatedEditingOffset() <= caretMinOffset(*position.deprecatedNode())) {
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insertNodeAt(*nodeToInsert, position);
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// Insert an extra br or '\n' if the just inserted one collapsed.
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if (!isStartOfParagraph(positionBeforeNode(nodeToInsert.get())))
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insertNodeBefore(nodeToInsert->cloneNode(false), *nodeToInsert);
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setEndingSelection(VisibleSelection(positionInParentAfterNode(nodeToInsert.get()), Affinity::Downstream, endingSelection().isDirectional()));
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// If we're inserting after all of the rendered text in a text node, or into a non-text node,
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// a simple insertion is sufficient.
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} else if (position.deprecatedEditingOffset() >= caretMaxOffset(*position.deprecatedNode()) || !is<Text>(*position.deprecatedNode())) {
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insertNodeAt(*nodeToInsert, position);
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setEndingSelection(VisibleSelection(positionInParentAfterNode(nodeToInsert.get()), Affinity::Downstream, endingSelection().isDirectional()));
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} else if (is<Text>(*position.deprecatedNode())) {
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// Split a text node
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Text& textNode = downcast<Text>(*position.deprecatedNode());
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splitTextNode(textNode, position.deprecatedEditingOffset());
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insertNodeBefore(*nodeToInsert, textNode);
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Position endingPosition = firstPositionInNode(&textNode);
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// Handle whitespace that occurs after the split
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document().updateLayoutIgnorePendingStylesheets();
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if (!endingPosition.isRenderedCharacter()) {
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Position positionBeforeTextNode(positionInParentBeforeNode(&textNode));
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// Clear out all whitespace and insert one non-breaking space
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deleteInsignificantTextDownstream(endingPosition);
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ASSERT(!textNode.renderer() || textNode.renderer()->style().collapseWhiteSpace());
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// Deleting insignificant whitespace will remove textNode if it contains nothing but insignificant whitespace.
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if (textNode.isConnected())
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insertTextIntoNode(textNode, 0, nonBreakingSpaceString());
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else {
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auto nbspNode = document().createTextNode(nonBreakingSpaceString());
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auto* nbspNodePtr = nbspNode.ptr();
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insertNodeAt(WTFMove(nbspNode), positionBeforeTextNode);
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endingPosition = firstPositionInNode(nbspNodePtr);
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}
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}
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setEndingSelection(VisibleSelection(endingPosition, Affinity::Downstream, endingSelection().isDirectional()));
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}
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// Handle the case where there is a typing style.
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RefPtr<EditingStyle> typingStyle = document().selection().typingStyle();
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if (typingStyle && !typingStyle->isEmpty()) {
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// Apply the typing style to the inserted line break, so that if the selection
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// leaves and then comes back, new input will have the right style.
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// FIXME: We shouldn't always apply the typing style to the line break here,
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// see <rdar://problem/5794462>.
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applyStyle(typingStyle.get(), firstPositionInOrBeforeNode(nodeToInsert.get()), lastPositionInOrAfterNode(nodeToInsert.get()));
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// Even though this applyStyle operates on a Range, it still sets an endingSelection().
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// It tries to set a VisibleSelection around the content it operated on. So, that VisibleSelection
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// will either (a) select the line break we inserted, or it will (b) be a caret just
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// before the line break (if the line break is at the end of a block it isn't selectable).
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// So, this next call sets the endingSelection() to a caret just after the line break
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// that we inserted, or just before it if it's at the end of a block.
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setEndingSelection(endingSelection().visibleEnd());
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}
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rebalanceWhitespace();
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}
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}
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