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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 "config.h"
#include "InsertLineBreakCommand.h"
#include "CSSMutableStyleDeclaration.h"
#include "Document.h"
#include "Frame.h"
#include "HTMLElement.h"
#include "HTMLNames.h"
#include "Range.h"
#include "RenderObject.h"
#include "Text.h"
#include "VisiblePosition.h"
#include "htmlediting.h"
#include "visible_units.h"
namespace WebCore {
using namespace HTMLNames;
InsertLineBreakCommand::InsertLineBreakCommand(Document* document)
: CompositeEditCommand(document)
{
}
bool InsertLineBreakCommand::preservesTypingStyle() const
{
return true;
}
void InsertLineBreakCommand::insertNodeAfterPosition(Node* node, const Position& pos)
{
// Insert the BR after the caret position. In the case the
// position is a block, do an append. We don't want to insert
// the BR *after* the block.
Element* cb = pos.node()->enclosingBlockFlowElement();
if (cb == pos.node())
appendNode(node, cb);
else
insertNodeAfter(node, pos.node());
}
void InsertLineBreakCommand::insertNodeBeforePosition(Node* node, const Position& pos)
{
// Insert the BR after the caret position. In the case the
// position is a block, do an append. We don't want to insert
// the BR *before* the block.
Element* cb = pos.node()->enclosingBlockFlowElement();
if (cb == pos.node())
appendNode(node, cb);
else
insertNodeBefore(node, pos.node());
}
// 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 renderer.
Position p(rangeCompliantEquivalent(insertionPos));
return p.node()->renderer() && !p.node()->renderer()->style()->preserveNewline();
}
void InsertLineBreakCommand::doApply()
{
deleteSelection();
VisibleSelection selection = endingSelection();
if (!selection.isNonOrphanedCaretOrRange())
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 pos(caret.deepEquivalent());
pos = positionAvoidingSpecialElementBoundary(pos);
pos = positionOutsideTabSpan(pos);
RefPtr<Node> nodeToInsert;
if (shouldUseBreakElement(pos))
nodeToInsert = createBreakElement(document());
else
nodeToInsert = document()->createTextNode("\n");
// FIXME: Need to merge text nodes when inserting just after or before text.
if (isEndOfParagraph(caret) && !lineBreakExistsAtVisiblePosition(caret)) {
bool needExtraLineBreak = !pos.node()->hasTagName(hrTag) && !pos.node()->hasTagName(tableTag);
insertNodeAt(nodeToInsert.get(), pos);
if (needExtraLineBreak)
insertNodeBefore(nodeToInsert->cloneNode(false), nodeToInsert);
VisiblePosition endingPosition(Position(nodeToInsert.get(), 0));
setEndingSelection(VisibleSelection(endingPosition));
} else if (pos.deprecatedEditingOffset() <= caretMinOffset(pos.node())) {
insertNodeAt(nodeToInsert.get(), pos);
// Insert an extra br or '\n' if the just inserted one collapsed.
if (!isStartOfParagraph(VisiblePosition(Position(nodeToInsert.get(), 0))))
insertNodeBefore(nodeToInsert->cloneNode(false).get(), nodeToInsert.get());
setEndingSelection(VisibleSelection(positionInParentAfterNode(nodeToInsert.get()), DOWNSTREAM));
// 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.deprecatedEditingOffset() >= caretMaxOffset(pos.node()) || !pos.node()->isTextNode()) {
insertNodeAt(nodeToInsert.get(), pos);
setEndingSelection(VisibleSelection(positionInParentAfterNode(nodeToInsert.get()), DOWNSTREAM));
} else if (pos.node()->isTextNode()) {
// Split a text node
Text* textNode = static_cast<Text*>(pos.node());
splitTextNode(textNode, pos.deprecatedEditingOffset());
insertNodeBefore(nodeToInsert, textNode);
Position endingPosition = Position(textNode, 0);
// Handle whitespace that occurs after the split
updateLayout();
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->inDocument())
insertTextIntoNode(textNode, 0, nonBreakingSpaceString());
else {
RefPtr<Text> nbspNode = document()->createTextNode(nonBreakingSpaceString());
insertNodeAt(nbspNode.get(), positionBeforeTextNode);
endingPosition = Position(nbspNode.get(), 0);
}
}
setEndingSelection(VisibleSelection(endingPosition, DOWNSTREAM));
}
// Handle the case where there is a typing style.
CSSMutableStyleDeclaration* typingStyle = document()->frame()->typingStyle();
if (typingStyle && typingStyle->length() > 0) {
// 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, firstDeepEditingPositionForNode(nodeToInsert.get()), lastDeepEditingPositionForNode(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();
}
}
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