--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/editing/InsertLineBreakCommand.cpp Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,188 @@
+/*
+ * 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.isNone())
+ 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();
+}
+
+}