| /* |
| * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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 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 "VisiblePosition.h" |
| |
| #include "CString.h" |
| #include "Document.h" |
| #include "FloatQuad.h" |
| #include "HTMLElement.h" |
| #include "HTMLNames.h" |
| #include "InlineTextBox.h" |
| #include "Logging.h" |
| #include "Range.h" |
| #include "Text.h" |
| #include "htmlediting.h" |
| #include "visible_units.h" |
| #include <stdio.h> |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| VisiblePosition::VisiblePosition(const Position &pos, EAffinity affinity) |
| { |
| init(pos, affinity); |
| } |
| |
| VisiblePosition::VisiblePosition(Node *node, int offset, EAffinity affinity) |
| { |
| ASSERT(offset >= 0); |
| init(Position(node, offset), affinity); |
| } |
| |
| void VisiblePosition::init(const Position& position, EAffinity affinity) |
| { |
| m_affinity = affinity; |
| |
| m_deepPosition = canonicalPosition(position); |
| |
| // When not at a line wrap, make sure to end up with DOWNSTREAM affinity. |
| if (m_affinity == UPSTREAM && (isNull() || inSameLine(VisiblePosition(position, DOWNSTREAM), *this))) |
| m_affinity = DOWNSTREAM; |
| } |
| |
| VisiblePosition VisiblePosition::next(bool stayInEditableContent) const |
| { |
| VisiblePosition next(nextVisuallyDistinctCandidate(m_deepPosition), m_affinity); |
| |
| if (!stayInEditableContent) |
| return next; |
| |
| return honorEditableBoundaryAtOrAfter(next); |
| } |
| |
| VisiblePosition VisiblePosition::previous(bool stayInEditableContent) const |
| { |
| // find first previous DOM position that is visible |
| Position pos = previousVisuallyDistinctCandidate(m_deepPosition); |
| |
| // return null visible position if there is no previous visible position |
| if (pos.atStartOfTree()) |
| return VisiblePosition(); |
| |
| VisiblePosition prev = VisiblePosition(pos, DOWNSTREAM); |
| ASSERT(prev != *this); |
| |
| #ifndef NDEBUG |
| // we should always be able to make the affinity DOWNSTREAM, because going previous from an |
| // UPSTREAM position can never yield another UPSTREAM position (unless line wrap length is 0!). |
| if (prev.isNotNull() && m_affinity == UPSTREAM) { |
| VisiblePosition temp = prev; |
| temp.setAffinity(UPSTREAM); |
| ASSERT(inSameLine(temp, prev)); |
| } |
| #endif |
| |
| if (!stayInEditableContent) |
| return prev; |
| |
| return honorEditableBoundaryAtOrBefore(prev); |
| } |
| |
| Position VisiblePosition::leftVisuallyDistinctCandidate() const |
| { |
| Position p = m_deepPosition; |
| if (!p.node()) |
| return Position(); |
| |
| Position downstreamStart = p.downstream(); |
| TextDirection primaryDirection = LTR; |
| for (RenderObject* r = p.node()->renderer(); r; r = r->parent()) { |
| if (r->isBlockFlow()) { |
| primaryDirection = r->style()->direction(); |
| break; |
| } |
| } |
| |
| while (true) { |
| InlineBox* box; |
| int offset; |
| p.getInlineBoxAndOffset(m_affinity, primaryDirection, box, offset); |
| if (!box) |
| return primaryDirection == LTR ? previousVisuallyDistinctCandidate(m_deepPosition) : nextVisuallyDistinctCandidate(m_deepPosition); |
| |
| RenderObject* renderer = box->renderer(); |
| |
| while (true) { |
| if ((renderer->isReplaced() || renderer->isBR()) && offset == box->caretRightmostOffset()) |
| return box->direction() == LTR ? previousVisuallyDistinctCandidate(m_deepPosition) : nextVisuallyDistinctCandidate(m_deepPosition); |
| |
| offset = box->direction() == LTR ? renderer->previousOffset(offset) : renderer->nextOffset(offset); |
| |
| int caretMinOffset = box->caretMinOffset(); |
| int caretMaxOffset = box->caretMaxOffset(); |
| |
| if (offset > caretMinOffset && offset < caretMaxOffset) |
| break; |
| |
| if (box->direction() == LTR ? offset < caretMinOffset : offset > caretMaxOffset) { |
| // Overshot to the left. |
| InlineBox* prevBox = box->prevLeafChild(); |
| if (!prevBox) |
| return primaryDirection == LTR ? previousVisuallyDistinctCandidate(m_deepPosition) : nextVisuallyDistinctCandidate(m_deepPosition); |
| |
| // Reposition at the other logical position corresponding to our edge's visual position and go for another round. |
| box = prevBox; |
| renderer = box->renderer(); |
| offset = prevBox->caretRightmostOffset(); |
| continue; |
| } |
| |
| ASSERT(offset == box->caretLeftmostOffset()); |
| |
| unsigned char level = box->bidiLevel(); |
| InlineBox* prevBox = box->prevLeafChild(); |
| |
| if (box->direction() == primaryDirection) { |
| if (!prevBox || prevBox->bidiLevel() >= level) |
| break; |
| |
| level = prevBox->bidiLevel(); |
| |
| InlineBox* nextBox = box; |
| do { |
| nextBox = nextBox->nextLeafChild(); |
| } while (nextBox && nextBox->bidiLevel() > level); |
| |
| if (nextBox && nextBox->bidiLevel() == level) |
| break; |
| |
| while (InlineBox* prevBox = box->prevLeafChild()) { |
| if (prevBox->bidiLevel() < level) |
| break; |
| box = prevBox; |
| } |
| renderer = box->renderer(); |
| offset = box->caretRightmostOffset(); |
| if (box->direction() == primaryDirection) |
| break; |
| continue; |
| } |
| |
| if (prevBox) { |
| box = prevBox; |
| renderer = box->renderer(); |
| offset = box->caretRightmostOffset(); |
| if (box->bidiLevel() > level) { |
| do { |
| prevBox = box->prevLeafChild(); |
| } while (prevBox && prevBox->bidiLevel() > level); |
| |
| if (!prevBox || prevBox->bidiLevel() < level) |
| continue; |
| } |
| } else { |
| // Trailing edge of a secondary run. Set to the leading edge of the entire run. |
| while (true) { |
| while (InlineBox* nextBox = box->nextLeafChild()) { |
| if (nextBox->bidiLevel() < level) |
| break; |
| box = nextBox; |
| } |
| if (box->bidiLevel() == level) |
| break; |
| level = box->bidiLevel(); |
| while (InlineBox* prevBox = box->prevLeafChild()) { |
| if (prevBox->bidiLevel() < level) |
| break; |
| box = prevBox; |
| } |
| if (box->bidiLevel() == level) |
| break; |
| level = box->bidiLevel(); |
| } |
| renderer = box->renderer(); |
| offset = primaryDirection == LTR ? box->caretMinOffset() : box->caretMaxOffset(); |
| } |
| break; |
| } |
| |
| p = Position(renderer->node(), offset); |
| |
| if ((p.isCandidate() && p.downstream() != downstreamStart) || p.atStartOfTree() || p.atEndOfTree()) |
| return p; |
| } |
| } |
| |
| VisiblePosition VisiblePosition::left(bool stayInEditableContent) const |
| { |
| Position pos = leftVisuallyDistinctCandidate(); |
| // FIXME: Why can't we move left from the last position in a tree? |
| if (pos.atStartOfTree() || pos.atEndOfTree()) |
| return VisiblePosition(); |
| |
| VisiblePosition left = VisiblePosition(pos, DOWNSTREAM); |
| ASSERT(left != *this); |
| |
| if (!stayInEditableContent) |
| return left; |
| |
| // FIXME: This may need to do something different from "before". |
| return honorEditableBoundaryAtOrBefore(left); |
| } |
| |
| Position VisiblePosition::rightVisuallyDistinctCandidate() const |
| { |
| Position p = m_deepPosition; |
| if (!p.node()) |
| return Position(); |
| |
| Position downstreamStart = p.downstream(); |
| TextDirection primaryDirection = LTR; |
| for (RenderObject* r = p.node()->renderer(); r; r = r->parent()) { |
| if (r->isBlockFlow()) { |
| primaryDirection = r->style()->direction(); |
| break; |
| } |
| } |
| |
| while (true) { |
| InlineBox* box; |
| int offset; |
| p.getInlineBoxAndOffset(m_affinity, primaryDirection, box, offset); |
| if (!box) |
| return primaryDirection == LTR ? nextVisuallyDistinctCandidate(m_deepPosition) : previousVisuallyDistinctCandidate(m_deepPosition); |
| |
| RenderObject* renderer = box->renderer(); |
| |
| while (true) { |
| if ((renderer->isReplaced() || renderer->isBR()) && offset == box->caretLeftmostOffset()) |
| return box->direction() == LTR ? nextVisuallyDistinctCandidate(m_deepPosition) : previousVisuallyDistinctCandidate(m_deepPosition); |
| |
| offset = box->direction() == LTR ? renderer->nextOffset(offset) : renderer->previousOffset(offset); |
| |
| int caretMinOffset = box->caretMinOffset(); |
| int caretMaxOffset = box->caretMaxOffset(); |
| |
| if (offset > caretMinOffset && offset < caretMaxOffset) |
| break; |
| |
| if (box->direction() == LTR ? offset > caretMaxOffset : offset < caretMinOffset) { |
| // Overshot to the right. |
| InlineBox* nextBox = box->nextLeafChild(); |
| if (!nextBox) |
| return primaryDirection == LTR ? nextVisuallyDistinctCandidate(m_deepPosition) : previousVisuallyDistinctCandidate(m_deepPosition); |
| |
| // Reposition at the other logical position corresponding to our edge's visual position and go for another round. |
| box = nextBox; |
| renderer = box->renderer(); |
| offset = nextBox->caretLeftmostOffset(); |
| continue; |
| } |
| |
| ASSERT(offset == box->caretRightmostOffset()); |
| |
| unsigned char level = box->bidiLevel(); |
| InlineBox* nextBox = box->nextLeafChild(); |
| |
| if (box->direction() == primaryDirection) { |
| if (!nextBox || nextBox->bidiLevel() >= level) |
| break; |
| |
| level = nextBox->bidiLevel(); |
| |
| InlineBox* prevBox = box; |
| do { |
| prevBox = prevBox->prevLeafChild(); |
| } while (prevBox && prevBox->bidiLevel() > level); |
| |
| if (prevBox && prevBox->bidiLevel() == level) // For example, abc FED 123 ^ CBA |
| break; |
| |
| // For example, abc 123 ^ CBA |
| while (InlineBox* nextBox = box->nextLeafChild()) { |
| if (nextBox->bidiLevel() < level) |
| break; |
| box = nextBox; |
| } |
| renderer = box->renderer(); |
| offset = box->caretLeftmostOffset(); |
| if (box->direction() == primaryDirection) |
| break; |
| continue; |
| } |
| |
| if (nextBox) { |
| box = nextBox; |
| renderer = box->renderer(); |
| offset = box->caretLeftmostOffset(); |
| if (box->bidiLevel() > level) { |
| do { |
| nextBox = box->nextLeafChild(); |
| } while (nextBox && nextBox->bidiLevel() > level); |
| |
| if (!nextBox || nextBox->bidiLevel() < level) |
| continue; |
| } |
| } else { |
| // Trailing edge of a secondary run. Set to the leading edge of the entire run. |
| while (true) { |
| while (InlineBox* prevBox = box->prevLeafChild()) { |
| if (prevBox->bidiLevel() < level) |
| break; |
| box = prevBox; |
| } |
| if (box->bidiLevel() == level) |
| break; |
| level = box->bidiLevel(); |
| while (InlineBox* nextBox = box->nextLeafChild()) { |
| if (nextBox->bidiLevel() < level) |
| break; |
| box = nextBox; |
| } |
| if (box->bidiLevel() == level) |
| break; |
| level = box->bidiLevel(); |
| } |
| renderer = box->renderer(); |
| offset = primaryDirection == LTR ? box->caretMaxOffset() : box->caretMinOffset(); |
| } |
| break; |
| } |
| |
| p = Position(renderer->node(), offset); |
| |
| if ((p.isCandidate() && p.downstream() != downstreamStart) || p.atStartOfTree() || p.atEndOfTree()) |
| return p; |
| } |
| } |
| |
| VisiblePosition VisiblePosition::right(bool stayInEditableContent) const |
| { |
| Position pos = rightVisuallyDistinctCandidate(); |
| // FIXME: Why can't we move left from the last position in a tree? |
| if (pos.atStartOfTree() || pos.atEndOfTree()) |
| return VisiblePosition(); |
| |
| VisiblePosition right = VisiblePosition(pos, DOWNSTREAM); |
| ASSERT(right != *this); |
| |
| if (!stayInEditableContent) |
| return right; |
| |
| // FIXME: This may need to do something different from "after". |
| return honorEditableBoundaryAtOrAfter(right); |
| } |
| |
| VisiblePosition VisiblePosition::honorEditableBoundaryAtOrBefore(const VisiblePosition &pos) const |
| { |
| if (pos.isNull()) |
| return pos; |
| |
| Node* highestRoot = highestEditableRoot(deepEquivalent()); |
| |
| // Return empty position if pos is not somewhere inside the editable region containing this position |
| if (highestRoot && !pos.deepEquivalent().node()->isDescendantOf(highestRoot)) |
| return VisiblePosition(); |
| |
| // Return pos itself if the two are from the very same editable region, or both are non-editable |
| // FIXME: In the non-editable case, just because the new position is non-editable doesn't mean movement |
| // to it is allowed. VisibleSelection::adjustForEditableContent has this problem too. |
| if (highestEditableRoot(pos.deepEquivalent()) == highestRoot) |
| return pos; |
| |
| // Return empty position if this position is non-editable, but pos is editable |
| // FIXME: Move to the previous non-editable region. |
| if (!highestRoot) |
| return VisiblePosition(); |
| |
| // Return the last position before pos that is in the same editable region as this position |
| return lastEditablePositionBeforePositionInRoot(pos.deepEquivalent(), highestRoot); |
| } |
| |
| VisiblePosition VisiblePosition::honorEditableBoundaryAtOrAfter(const VisiblePosition &pos) const |
| { |
| if (pos.isNull()) |
| return pos; |
| |
| Node* highestRoot = highestEditableRoot(deepEquivalent()); |
| |
| // Return empty position if pos is not somewhere inside the editable region containing this position |
| if (highestRoot && !pos.deepEquivalent().node()->isDescendantOf(highestRoot)) |
| return VisiblePosition(); |
| |
| // Return pos itself if the two are from the very same editable region, or both are non-editable |
| // FIXME: In the non-editable case, just because the new position is non-editable doesn't mean movement |
| // to it is allowed. VisibleSelection::adjustForEditableContent has this problem too. |
| if (highestEditableRoot(pos.deepEquivalent()) == highestRoot) |
| return pos; |
| |
| // Return empty position if this position is non-editable, but pos is editable |
| // FIXME: Move to the next non-editable region. |
| if (!highestRoot) |
| return VisiblePosition(); |
| |
| // Return the next position after pos that is in the same editable region as this position |
| return firstEditablePositionAfterPositionInRoot(pos.deepEquivalent(), highestRoot); |
| } |
| |
| static Position canonicalizeCandidate(const Position& candidate) |
| { |
| if (candidate.isNull()) |
| return Position(); |
| ASSERT(candidate.isCandidate()); |
| Position upstream = candidate.upstream(); |
| if (upstream.isCandidate()) |
| return upstream; |
| return candidate; |
| } |
| |
| Position VisiblePosition::canonicalPosition(const Position& position) |
| { |
| // FIXME (9535): Canonicalizing to the leftmost candidate means that if we're at a line wrap, we will |
| // ask renderers to paint downstream carets for other renderers. |
| // To fix this, we need to either a) add code to all paintCarets to pass the responsibility off to |
| // the appropriate renderer for VisiblePosition's like these, or b) canonicalize to the rightmost candidate |
| // unless the affinity is upstream. |
| Node* node = position.node(); |
| if (!node) |
| return Position(); |
| |
| node->document()->updateLayoutIgnorePendingStylesheets(); |
| |
| Position candidate = position.upstream(); |
| if (candidate.isCandidate()) |
| return candidate; |
| candidate = position.downstream(); |
| if (candidate.isCandidate()) |
| return candidate; |
| |
| // When neither upstream or downstream gets us to a candidate (upstream/downstream won't leave |
| // blocks or enter new ones), we search forward and backward until we find one. |
| Position next = canonicalizeCandidate(nextCandidate(position)); |
| Position prev = canonicalizeCandidate(previousCandidate(position)); |
| Node* nextNode = next.node(); |
| Node* prevNode = prev.node(); |
| |
| // The new position must be in the same editable element. Enforce that first. |
| // Unless the descent is from a non-editable html element to an editable body. |
| if (node->hasTagName(htmlTag) && !node->isContentEditable() && node->document()->body() && node->document()->body()->isContentEditable()) |
| return next.isNotNull() ? next : prev; |
| |
| Node* editingRoot = editableRootForPosition(position); |
| |
| // If the html element is editable, descending into its body will look like a descent |
| // from non-editable to editable content since rootEditableElement() always stops at the body. |
| if ((editingRoot && editingRoot->hasTagName(htmlTag)) || position.node()->isDocumentNode()) |
| return next.isNotNull() ? next : prev; |
| |
| bool prevIsInSameEditableElement = prevNode && editableRootForPosition(prev) == editingRoot; |
| bool nextIsInSameEditableElement = nextNode && editableRootForPosition(next) == editingRoot; |
| if (prevIsInSameEditableElement && !nextIsInSameEditableElement) |
| return prev; |
| |
| if (nextIsInSameEditableElement && !prevIsInSameEditableElement) |
| return next; |
| |
| if (!nextIsInSameEditableElement && !prevIsInSameEditableElement) |
| return Position(); |
| |
| // The new position should be in the same block flow element. Favor that. |
| Node *originalBlock = node->enclosingBlockFlowElement(); |
| bool nextIsOutsideOriginalBlock = !nextNode->isDescendantOf(originalBlock) && nextNode != originalBlock; |
| bool prevIsOutsideOriginalBlock = !prevNode->isDescendantOf(originalBlock) && prevNode != originalBlock; |
| if (nextIsOutsideOriginalBlock && !prevIsOutsideOriginalBlock) |
| return prev; |
| |
| return next; |
| } |
| |
| UChar32 VisiblePosition::characterAfter() const |
| { |
| // We canonicalize to the first of two equivalent candidates, but the second of the two candidates |
| // is the one that will be inside the text node containing the character after this visible position. |
| Position pos = m_deepPosition.downstream(); |
| Node* node = pos.node(); |
| if (!node || !node->isTextNode()) |
| return 0; |
| Text* textNode = static_cast<Text*>(pos.node()); |
| unsigned offset = pos.deprecatedEditingOffset(); |
| unsigned length = textNode->length(); |
| if (offset >= length) |
| return 0; |
| |
| UChar32 ch; |
| const UChar* characters = textNode->data().characters(); |
| U16_NEXT(characters, offset, length, ch); |
| return ch; |
| } |
| |
| IntRect VisiblePosition::localCaretRect(RenderObject*& renderer) const |
| { |
| Node* node = m_deepPosition.node(); |
| if (!node) { |
| renderer = 0; |
| return IntRect(); |
| } |
| |
| renderer = node->renderer(); |
| if (!renderer) |
| return IntRect(); |
| |
| InlineBox* inlineBox; |
| int caretOffset; |
| getInlineBoxAndOffset(inlineBox, caretOffset); |
| |
| if (inlineBox) |
| renderer = inlineBox->renderer(); |
| |
| return renderer->localCaretRect(inlineBox, caretOffset); |
| } |
| |
| IntRect VisiblePosition::absoluteCaretBounds() const |
| { |
| RenderObject* renderer; |
| IntRect localRect = localCaretRect(renderer); |
| if (localRect.isEmpty() || !renderer) |
| return IntRect(); |
| |
| return renderer->localToAbsoluteQuad(FloatRect(localRect)).enclosingBoundingBox(); |
| } |
| |
| int VisiblePosition::xOffsetForVerticalNavigation() const |
| { |
| RenderObject* renderer; |
| IntRect localRect = localCaretRect(renderer); |
| if (localRect.isEmpty() || !renderer) |
| return 0; |
| |
| // This ignores transforms on purpose, for now. Vertical navigation is done |
| // without consulting transforms, so that 'up' in transformed text is 'up' |
| // relative to the text, not absolute 'up'. |
| return renderer->localToAbsolute(localRect.location()).x(); |
| } |
| |
| void VisiblePosition::debugPosition(const char* msg) const |
| { |
| if (isNull()) |
| fprintf(stderr, "Position [%s]: null\n", msg); |
| else |
| fprintf(stderr, "Position [%s]: %s [%p] at %d\n", msg, m_deepPosition.node()->nodeName().utf8().data(), m_deepPosition.node(), m_deepPosition.deprecatedEditingOffset()); |
| } |
| |
| #ifndef NDEBUG |
| |
| void VisiblePosition::formatForDebugger(char* buffer, unsigned length) const |
| { |
| m_deepPosition.formatForDebugger(buffer, length); |
| } |
| |
| void VisiblePosition::showTreeForThis() const |
| { |
| m_deepPosition.showTreeForThis(); |
| } |
| |
| #endif |
| |
| PassRefPtr<Range> makeRange(const VisiblePosition &start, const VisiblePosition &end) |
| { |
| if (start.isNull() || end.isNull()) |
| return 0; |
| |
| Position s = rangeCompliantEquivalent(start); |
| Position e = rangeCompliantEquivalent(end); |
| return Range::create(s.node()->document(), s.node(), s.deprecatedEditingOffset(), e.node(), e.deprecatedEditingOffset()); |
| } |
| |
| VisiblePosition startVisiblePosition(const Range *r, EAffinity affinity) |
| { |
| int exception = 0; |
| return VisiblePosition(r->startContainer(exception), r->startOffset(exception), affinity); |
| } |
| |
| VisiblePosition endVisiblePosition(const Range *r, EAffinity affinity) |
| { |
| int exception = 0; |
| return VisiblePosition(r->endContainer(exception), r->endOffset(exception), affinity); |
| } |
| |
| bool setStart(Range *r, const VisiblePosition &visiblePosition) |
| { |
| if (!r) |
| return false; |
| Position p = rangeCompliantEquivalent(visiblePosition); |
| int code = 0; |
| r->setStart(p.node(), p.deprecatedEditingOffset(), code); |
| return code == 0; |
| } |
| |
| bool setEnd(Range *r, const VisiblePosition &visiblePosition) |
| { |
| if (!r) |
| return false; |
| Position p = rangeCompliantEquivalent(visiblePosition); |
| int code = 0; |
| r->setEnd(p.node(), p.deprecatedEditingOffset(), code); |
| return code == 0; |
| } |
| |
| Node *enclosingBlockFlowElement(const VisiblePosition &visiblePosition) |
| { |
| if (visiblePosition.isNull()) |
| return NULL; |
| |
| return visiblePosition.deepEquivalent().node()->enclosingBlockFlowElement(); |
| } |
| |
| bool isFirstVisiblePositionInNode(const VisiblePosition &visiblePosition, const Node *node) |
| { |
| if (visiblePosition.isNull()) |
| return false; |
| |
| if (!visiblePosition.deepEquivalent().node()->isDescendantOf(node)) |
| return false; |
| |
| VisiblePosition previous = visiblePosition.previous(); |
| return previous.isNull() || !previous.deepEquivalent().node()->isDescendantOf(node); |
| } |
| |
| bool isLastVisiblePositionInNode(const VisiblePosition &visiblePosition, const Node *node) |
| { |
| if (visiblePosition.isNull()) |
| return false; |
| |
| if (!visiblePosition.deepEquivalent().node()->isDescendantOf(node)) |
| return false; |
| |
| VisiblePosition next = visiblePosition.next(); |
| return next.isNull() || !next.deepEquivalent().node()->isDescendantOf(node); |
| } |
| |
| } // namespace WebCore |
| |
| #ifndef NDEBUG |
| |
| void showTree(const WebCore::VisiblePosition* vpos) |
| { |
| if (vpos) |
| vpos->showTreeForThis(); |
| } |
| |
| void showTree(const WebCore::VisiblePosition& vpos) |
| { |
| vpos.showTreeForThis(); |
| } |
| |
| #endif |
