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27 #include "InsertLineBreakCommand.h"
29 #include "CSSMutableStyleDeclaration.h"
32 #include "HTMLElement.h"
33 #include "HTMLNames.h"
35 #include "RenderObject.h"
37 #include "VisiblePosition.h"
38 #include "htmlediting.h"
39 #include "visible_units.h"
43 using namespace HTMLNames;
45 InsertLineBreakCommand::InsertLineBreakCommand(Document* document)
46 : CompositeEditCommand(document)
50 bool InsertLineBreakCommand::preservesTypingStyle() const
55 void InsertLineBreakCommand::insertNodeAfterPosition(Node* node, const Position& pos)
57 // Insert the BR after the caret position. In the case the
58 // position is a block, do an append. We don't want to insert
59 // the BR *after* the block.
60 Element* cb = pos.node()->enclosingBlockFlowElement();
64 insertNodeAfter(node, pos.node());
67 void InsertLineBreakCommand::insertNodeBeforePosition(Node* node, const Position& pos)
69 // Insert the BR after the caret position. In the case the
70 // position is a block, do an append. We don't want to insert
71 // the BR *before* the block.
72 Element* cb = pos.node()->enclosingBlockFlowElement();
76 insertNodeBefore(node, pos.node());
79 // Whether we should insert a break element or a '\n'.
80 bool InsertLineBreakCommand::shouldUseBreakElement(const Position& insertionPos)
82 // An editing position like [input, 0] actually refers to the position before
83 // the input element, and in that case we need to check the input element's
85 Position p(rangeCompliantEquivalent(insertionPos));
86 return p.node()->renderer() && !p.node()->renderer()->style()->preserveNewline();
89 void InsertLineBreakCommand::doApply()
92 VisibleSelection selection = endingSelection();
93 if (!selection.isNonOrphanedCaretOrRange())
96 VisiblePosition caret(selection.visibleStart());
97 // FIXME: If the node is hidden, we should still be able to insert text.
98 // For now, we return to avoid a crash. https://bugs.webkit.org/show_bug.cgi?id=40342
102 Position pos(caret.deepEquivalent());
104 pos = positionAvoidingSpecialElementBoundary(pos);
106 pos = positionOutsideTabSpan(pos);
108 RefPtr<Node> nodeToInsert;
109 if (shouldUseBreakElement(pos))
110 nodeToInsert = createBreakElement(document());
112 nodeToInsert = document()->createTextNode("\n");
114 // FIXME: Need to merge text nodes when inserting just after or before text.
116 if (isEndOfParagraph(caret) && !lineBreakExistsAtVisiblePosition(caret)) {
117 bool needExtraLineBreak = !pos.node()->hasTagName(hrTag) && !pos.node()->hasTagName(tableTag);
119 insertNodeAt(nodeToInsert.get(), pos);
121 if (needExtraLineBreak)
122 insertNodeBefore(nodeToInsert->cloneNode(false), nodeToInsert);
124 VisiblePosition endingPosition(Position(nodeToInsert.get(), 0));
125 setEndingSelection(VisibleSelection(endingPosition));
126 } else if (pos.deprecatedEditingOffset() <= caretMinOffset(pos.node())) {
127 insertNodeAt(nodeToInsert.get(), pos);
129 // Insert an extra br or '\n' if the just inserted one collapsed.
130 if (!isStartOfParagraph(VisiblePosition(Position(nodeToInsert.get(), 0))))
131 insertNodeBefore(nodeToInsert->cloneNode(false).get(), nodeToInsert.get());
133 setEndingSelection(VisibleSelection(positionInParentAfterNode(nodeToInsert.get()), DOWNSTREAM));
134 // If we're inserting after all of the rendered text in a text node, or into a non-text node,
135 // a simple insertion is sufficient.
136 } else if (pos.deprecatedEditingOffset() >= caretMaxOffset(pos.node()) || !pos.node()->isTextNode()) {
137 insertNodeAt(nodeToInsert.get(), pos);
138 setEndingSelection(VisibleSelection(positionInParentAfterNode(nodeToInsert.get()), DOWNSTREAM));
139 } else if (pos.node()->isTextNode()) {
141 Text* textNode = static_cast<Text*>(pos.node());
142 splitTextNode(textNode, pos.deprecatedEditingOffset());
143 insertNodeBefore(nodeToInsert, textNode);
144 Position endingPosition = Position(textNode, 0);
146 // Handle whitespace that occurs after the split
148 if (!endingPosition.isRenderedCharacter()) {
149 Position positionBeforeTextNode(positionInParentBeforeNode(textNode));
150 // Clear out all whitespace and insert one non-breaking space
151 deleteInsignificantTextDownstream(endingPosition);
152 ASSERT(!textNode->renderer() || textNode->renderer()->style()->collapseWhiteSpace());
153 // Deleting insignificant whitespace will remove textNode if it contains nothing but insignificant whitespace.
154 if (textNode->inDocument())
155 insertTextIntoNode(textNode, 0, nonBreakingSpaceString());
157 RefPtr<Text> nbspNode = document()->createTextNode(nonBreakingSpaceString());
158 insertNodeAt(nbspNode.get(), positionBeforeTextNode);
159 endingPosition = Position(nbspNode.get(), 0);
163 setEndingSelection(VisibleSelection(endingPosition, DOWNSTREAM));
166 // Handle the case where there is a typing style.
168 RefPtr<EditingStyle> typingStyle = document()->frame()->selection()->typingStyle();
170 if (typingStyle && !typingStyle->isEmpty()) {
171 // Apply the typing style to the inserted line break, so that if the selection
172 // leaves and then comes back, new input will have the right style.
173 // FIXME: We shouldn't always apply the typing style to the line break here,
174 // see <rdar://problem/5794462>.
175 applyStyle(typingStyle->style(), firstDeepEditingPositionForNode(nodeToInsert.get()), lastDeepEditingPositionForNode(nodeToInsert.get()));
176 // Even though this applyStyle operates on a Range, it still sets an endingSelection().
177 // It tries to set a VisibleSelection around the content it operated on. So, that VisibleSelection
178 // will either (a) select the line break we inserted, or it will (b) be a caret just
179 // before the line break (if the line break is at the end of a block it isn't selectable).
180 // So, this next call sets the endingSelection() to a caret just after the line break
181 // that we inserted, or just before it if it's at the end of a block.
182 setEndingSelection(endingSelection().visibleEnd());
185 rebalanceWhitespace();