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/*
* Copyright (C) 2005, 2006 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 "core/editing/commands/InsertLineBreakCommand.h"
#include "core/HTMLNames.h"
#include "core/dom/Document.h"
#include "core/dom/Text.h"
#include "core/editing/EditingStyle.h"
#include "core/editing/EditingUtilities.h"
#include "core/editing/FrameSelection.h"
#include "core/editing/VisiblePosition.h"
#include "core/editing/VisibleUnits.h"
#include "core/frame/LocalFrame.h"
#include "core/html/HTMLBRElement.h"
#include "core/html/HTMLElement.h"
#include "core/html/TextControlElement.h"
#include "core/layout/LayoutObject.h"
#include "core/layout/LayoutText.h"
namespace blink {
using namespace HTMLNames;
InsertLineBreakCommand::InsertLineBreakCommand(Document& document)
: CompositeEditCommand(document) {}
bool InsertLineBreakCommand::preservesTypingStyle() const {
return true;
}
// Whether we should insert a break element or a '\n'.
bool InsertLineBreakCommand::shouldUseBreakElement(
const Position& insertionPos) {
// An editing position like [input, 0] actually refers to the position before
// the input element, and in that case we need to check the input element's
// parent's layoutObject.
Position p(insertionPos.parentAnchoredEquivalent());
return isRichlyEditablePosition(p) && p.anchorNode()->layoutObject() &&
!p.anchorNode()->layoutObject()->style()->preserveNewline();
}
void InsertLineBreakCommand::doApply(EditingState* editingState) {
deleteSelection(editingState);
if (editingState->isAborted())
return;
document().updateStyleAndLayoutIgnorePendingStylesheets();
VisibleSelection selection = endingSelection();
if (!selection.isNonOrphanedCaretOrRange())
return;
// TODO(xiaochengh): Stop storing VisiblePositions through mutations.
VisiblePosition caret(selection.visibleStart());
// FIXME: If the node is hidden, we should still be able to insert text. For
// now, we return to avoid a crash.
// https://bugs.webkit.org/show_bug.cgi?id=40342
if (caret.isNull())
return;
Position pos(caret.deepEquivalent());
pos = positionAvoidingSpecialElementBoundary(pos, editingState);
if (editingState->isAborted())
return;
pos = positionOutsideTabSpan(pos);
Node* nodeToInsert = nullptr;
if (shouldUseBreakElement(pos))
nodeToInsert = HTMLBRElement::create(document());
else
nodeToInsert = document().createTextNode("\n");
document().updateStyleAndLayoutIgnorePendingStylesheets();
// FIXME: Need to merge text nodes when inserting just after or before text.
if (isEndOfParagraph(createVisiblePosition(caret.toPositionWithAffinity())) &&
!lineBreakExistsAtVisiblePosition(caret)) {
bool needExtraLineBreak = !isHTMLHRElement(*pos.anchorNode()) &&
!isHTMLTableElement(*pos.anchorNode());
insertNodeAt(nodeToInsert, pos, editingState);
if (editingState->isAborted())
return;
if (needExtraLineBreak) {
Node* extraNode;
// TODO(tkent): Can we remove TextControlElement dependency?
if (TextControlElement* textControl =
enclosingTextControl(nodeToInsert)) {
extraNode = textControl->createPlaceholderBreakElement();
// The placeholder BR should be the last child. There might be
// empty Text nodes at |pos|.
appendNode(extraNode, nodeToInsert->parentNode(), editingState);
} else {
extraNode = nodeToInsert->cloneNode(false);
insertNodeAfter(extraNode, nodeToInsert, editingState);
}
if (editingState->isAborted())
return;
nodeToInsert = extraNode;
}
setEndingSelection(SelectionInDOMTree::Builder()
.collapse(Position::beforeNode(nodeToInsert))
.setIsDirectional(endingSelection().isDirectional())
.build());
} else if (pos.computeEditingOffset() <= caretMinOffset(pos.anchorNode())) {
insertNodeAt(nodeToInsert, pos, editingState);
if (editingState->isAborted())
return;
document().updateStyleAndLayoutIgnorePendingStylesheets();
// Insert an extra br or '\n' if the just inserted one collapsed.
if (!isStartOfParagraph(VisiblePosition::beforeNode(nodeToInsert))) {
insertNodeBefore(nodeToInsert->cloneNode(false), nodeToInsert,
editingState);
if (editingState->isAborted())
return;
}
setEndingSelection(SelectionInDOMTree::Builder()
.collapse(Position::inParentAfterNode(*nodeToInsert))
.setIsDirectional(endingSelection().isDirectional())
.build());
// If we're inserting after all of the rendered text in a text node, or into
// a non-text node, a simple insertion is sufficient.
} else if (!pos.anchorNode()->isTextNode() ||
pos.computeOffsetInContainerNode() >=
caretMaxOffset(pos.anchorNode())) {
insertNodeAt(nodeToInsert, pos, editingState);
if (editingState->isAborted())
return;
setEndingSelection(SelectionInDOMTree::Builder()
.collapse(Position::inParentAfterNode(*nodeToInsert))
.setIsDirectional(endingSelection().isDirectional())
.build());
} else if (pos.anchorNode()->isTextNode()) {
// Split a text node
Text* textNode = toText(pos.anchorNode());
splitTextNode(textNode, pos.computeOffsetInContainerNode());
insertNodeBefore(nodeToInsert, textNode, editingState);
if (editingState->isAborted())
return;
Position endingPosition = Position::firstPositionInNode(textNode);
// Handle whitespace that occurs after the split
document().updateStyleAndLayoutIgnorePendingStylesheets();
// TODO(yosin) |isRenderedCharacter()| should be removed, and we should
// use |VisiblePosition::characterAfter()|.
if (!isRenderedCharacter(endingPosition)) {
Position positionBeforeTextNode(Position::inParentBeforeNode(*textNode));
// Clear out all whitespace and insert one non-breaking space
deleteInsignificantTextDownstream(endingPosition);
DCHECK(!textNode->layoutObject() ||
textNode->layoutObject()->style()->collapseWhiteSpace());
// Deleting insignificant whitespace will remove textNode if it contains
// nothing but insignificant whitespace.
if (textNode->isConnected()) {
insertTextIntoNode(textNode, 0, nonBreakingSpaceString());
} else {
Text* nbspNode = document().createTextNode(nonBreakingSpaceString());
insertNodeAt(nbspNode, positionBeforeTextNode, editingState);
if (editingState->isAborted())
return;
endingPosition = Position::firstPositionInNode(nbspNode);
}
}
setEndingSelection(SelectionInDOMTree::Builder()
.collapse(endingPosition)
.setIsDirectional(endingSelection().isDirectional())
.build());
}
// Handle the case where there is a typing style.
EditingStyle* typingStyle = document().frame()->selection().typingStyle();
if (typingStyle && !typingStyle->isEmpty()) {
// Apply the typing style to the inserted line break, so that if the
// selection leaves and then comes back, new input will have the right
// style.
// FIXME: We shouldn't always apply the typing style to the line break here,
// see <rdar://problem/5794462>.
applyStyle(typingStyle, firstPositionInOrBeforeNode(nodeToInsert),
lastPositionInOrAfterNode(nodeToInsert), editingState);
if (editingState->isAborted())
return;
// Even though this applyStyle operates on a Range, it still sets an
// endingSelection(). It tries to set a VisibleSelection around the content
// it operated on. So, that VisibleSelection will either
// (a) select the line break we inserted, or it will
// (b) be a caret just before the line break (if the line break is at the
// end of a block it isn't selectable).
// So, this next call sets the endingSelection() to a caret just after the
// line break that we inserted, or just before it if it's at the end of a
// block.
setEndingSelection(SelectionInDOMTree::Builder()
.collapse(endingSelection().end())
.build());
}
rebalanceWhitespace();
}
} // namespace blink
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