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/*
* Copyright (C) 2005, 2006 Apple 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 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 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 "InsertLineBreakCommand.h"
#include "Document.h"
#include "Editing.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "HTMLBRElement.h"
#include "HTMLHRElement.h"
#include "HTMLNames.h"
#include "HTMLTableElement.h"
#include "RenderElement.h"
#include "RenderText.h"
#include "Text.h"
#include "VisibleUnits.h"
namespace WebCore {
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& position)
{
// 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 renderer.
auto* node = position.parentAnchoredEquivalent().deprecatedNode();
return node && node->renderer() && !node->renderer()->style().preserveNewline();
}
void InsertLineBreakCommand::doApply()
{
deleteSelection();
VisibleSelection selection = endingSelection();
if (selection.isNoneOrOrphaned())
return;
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 position(caret.deepEquivalent());
position = positionAvoidingSpecialElementBoundary(position);
position = positionOutsideTabSpan(position);
if (!isEditablePosition(position))
return;
RefPtr<Node> nodeToInsert;
if (shouldUseBreakElement(position))
nodeToInsert = HTMLBRElement::create(document());
else
nodeToInsert = document().createTextNode("\n"_s);
// FIXME: Need to merge text nodes when inserting just after or before text.
if (isEndOfParagraph(caret) && !lineBreakExistsAtVisiblePosition(caret)) {
bool needExtraLineBreak = !is<HTMLHRElement>(*position.deprecatedNode()) && !is<HTMLTableElement>(*position.deprecatedNode());
insertNodeAt(*nodeToInsert, position);
if (needExtraLineBreak)
insertNodeBefore(nodeToInsert->cloneNode(false), *nodeToInsert);
VisiblePosition endingPosition(positionBeforeNode(nodeToInsert.get()));
setEndingSelection(VisibleSelection(endingPosition, endingSelection().isDirectional()));
} else if (position.deprecatedEditingOffset() <= caretMinOffset(*position.deprecatedNode())) {
insertNodeAt(*nodeToInsert, position);
// Insert an extra br or '\n' if the just inserted one collapsed.
if (!isStartOfParagraph(positionBeforeNode(nodeToInsert.get())))
insertNodeBefore(nodeToInsert->cloneNode(false), *nodeToInsert);
setEndingSelection(VisibleSelection(positionInParentAfterNode(nodeToInsert.get()), Affinity::Downstream, endingSelection().isDirectional()));
// 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 (position.deprecatedEditingOffset() >= caretMaxOffset(*position.deprecatedNode()) || !is<Text>(*position.deprecatedNode())) {
insertNodeAt(*nodeToInsert, position);
setEndingSelection(VisibleSelection(positionInParentAfterNode(nodeToInsert.get()), Affinity::Downstream, endingSelection().isDirectional()));
} else if (is<Text>(*position.deprecatedNode())) {
// Split a text node
Text& textNode = downcast<Text>(*position.deprecatedNode());
splitTextNode(textNode, position.deprecatedEditingOffset());
insertNodeBefore(*nodeToInsert, textNode);
Position endingPosition = firstPositionInNode(&textNode);
// Handle whitespace that occurs after the split
document().updateLayoutIgnorePendingStylesheets();
if (!endingPosition.isRenderedCharacter()) {
Position positionBeforeTextNode(positionInParentBeforeNode(&textNode));
// Clear out all whitespace and insert one non-breaking space
deleteInsignificantTextDownstream(endingPosition);
ASSERT(!textNode.renderer() || textNode.renderer()->style().collapseWhiteSpace());
// Deleting insignificant whitespace will remove textNode if it contains nothing but insignificant whitespace.
if (textNode.isConnected())
insertTextIntoNode(textNode, 0, nonBreakingSpaceString());
else {
auto nbspNode = document().createTextNode(String { nonBreakingSpaceString() });
auto* nbspNodePtr = nbspNode.ptr();
insertNodeAt(WTFMove(nbspNode), positionBeforeTextNode);
endingPosition = firstPositionInNode(nbspNodePtr);
}
}
setEndingSelection(VisibleSelection(endingPosition, Affinity::Downstream, endingSelection().isDirectional()));
}
// Handle the case where there is a typing style.
RefPtr<EditingStyle> typingStyle = document().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.get(), firstPositionInOrBeforeNode(nodeToInsert.get()), lastPositionInOrAfterNode(nodeToInsert.get()));
// 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(endingSelection().visibleEnd());
}
rebalanceWhitespace();
}
}