| /* |
| * Copyright (C) 2004-2020 Apple Inc. All rights reserved. |
| * Portions Copyright (c) 2011 Motorola Mobility, 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 "VisiblePosition.h" |
| |
| #include "BoundaryPoint.h" |
| #include "CaretRectComputation.h" |
| #include "Document.h" |
| #include "Editing.h" |
| #include "FloatQuad.h" |
| #include "HTMLElement.h" |
| #include "HTMLHtmlElement.h" |
| #include "HTMLNames.h" |
| #include "InlineIteratorBox.h" |
| #include "InlineIteratorLineBox.h" |
| #include "InlineRunAndOffset.h" |
| #include "LineSelection.h" |
| #include "Logging.h" |
| #include "Range.h" |
| #include "RenderBlockFlow.h" |
| #include "SimpleRange.h" |
| #include "Text.h" |
| #include "TextIterator.h" |
| #include "VisibleUnits.h" |
| #include <stdio.h> |
| #include <wtf/text/CString.h> |
| #include <wtf/text/TextStream.h> |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| VisiblePosition::VisiblePosition(const Position& position, Affinity affinity) |
| : m_deepPosition { canonicalPosition(position) } |
| { |
| if (affinity == Affinity::Upstream && !isNull()) { |
| auto upstreamCopy = *this; |
| upstreamCopy.m_affinity = Affinity::Upstream; |
| if (!inSameLine(*this, upstreamCopy)) |
| m_affinity = Affinity::Upstream; |
| } |
| } |
| |
| VisiblePosition VisiblePosition::next(EditingBoundaryCrossingRule rule, bool* reachedBoundary) const |
| { |
| if (reachedBoundary) |
| *reachedBoundary = false; |
| // FIXME: Support CanSkipEditingBoundary |
| ASSERT(rule == CanCrossEditingBoundary || rule == CannotCrossEditingBoundary); |
| VisiblePosition next(nextVisuallyDistinctCandidate(m_deepPosition), m_affinity); |
| |
| if (rule == CanCrossEditingBoundary) |
| return next; |
| |
| return honorEditingBoundaryAtOrAfter(next, reachedBoundary); |
| } |
| |
| VisiblePosition VisiblePosition::previous(EditingBoundaryCrossingRule rule, bool* reachedBoundary) const |
| { |
| if (reachedBoundary) |
| *reachedBoundary = false; |
| // FIXME: Support CanSkipEditingBoundary |
| ASSERT(rule == CanCrossEditingBoundary || rule == CannotCrossEditingBoundary); |
| // 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()) { |
| if (reachedBoundary) |
| *reachedBoundary = true; |
| return VisiblePosition(); |
| } |
| |
| VisiblePosition prev = pos; |
| ASSERT(prev != *this); |
| |
| #if ASSERT_ENABLED |
| // 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 == Affinity::Upstream) { |
| auto upstreamCopy = prev; |
| upstreamCopy.setAffinity(Affinity::Upstream); |
| ASSERT(inSameLine(upstreamCopy, prev)); |
| } |
| #endif |
| |
| if (rule == CanCrossEditingBoundary) |
| return prev; |
| |
| return honorEditingBoundaryAtOrBefore(prev, reachedBoundary); |
| } |
| |
| Position VisiblePosition::leftVisuallyDistinctCandidate() const |
| { |
| Position p = m_deepPosition; |
| if (p.isNull()) |
| return Position(); |
| |
| Position downstreamStart = p.downstream(); |
| TextDirection primaryDirection = p.primaryDirection(); |
| |
| InlineIterator::LineLogicalOrderCache orderCache; |
| |
| while (true) { |
| auto [box, offset] = p.inlineBoxAndOffset(m_affinity, primaryDirection); |
| if (!box) |
| return primaryDirection == TextDirection::LTR ? previousVisuallyDistinctCandidate(m_deepPosition) : nextVisuallyDistinctCandidate(m_deepPosition); |
| |
| auto* renderer = &box->renderer(); |
| |
| while (true) { |
| if ((renderer->isReplacedOrInlineBlock() || renderer->isBR()) && offset == box->rightmostCaretOffset()) |
| return box->isLeftToRightDirection() ? previousVisuallyDistinctCandidate(m_deepPosition) : nextVisuallyDistinctCandidate(m_deepPosition); |
| |
| if (!renderer->node()) { |
| box.traversePreviousOnLine(); |
| if (!box) |
| return primaryDirection == TextDirection::LTR ? previousVisuallyDistinctCandidate(m_deepPosition) : nextVisuallyDistinctCandidate(m_deepPosition); |
| renderer = &box->renderer(); |
| offset = box->rightmostCaretOffset(); |
| continue; |
| } |
| |
| // Note that this may underflow the (unsigned) offset. This is fine and handled below. |
| offset = box->isLeftToRightDirection() ? renderer->previousOffset(offset) : renderer->nextOffset(offset); |
| |
| auto caretMinOffset = box->minimumCaretOffset(); |
| auto caretMaxOffset = box->maximumCaretOffset(); |
| |
| if (offset > caretMinOffset && offset < caretMaxOffset) |
| break; |
| |
| if (offset != box->leftmostCaretOffset()) { |
| // Overshot to the left. |
| auto previousBox = box->previousOnLineIgnoringLineBreak(); |
| if (!previousBox) { |
| Position positionOnLeft = primaryDirection == TextDirection::LTR ? previousVisuallyDistinctCandidate(m_deepPosition) : nextVisuallyDistinctCandidate(m_deepPosition); |
| auto boxOnLeft = positionOnLeft.inlineBoxAndOffset(m_affinity, primaryDirection).box; |
| if (boxOnLeft && boxOnLeft->lineBox() == box->lineBox()) |
| return Position(); |
| return positionOnLeft; |
| } |
| |
| // Reposition at the other logical position corresponding to our edge's visual position and go for another round. |
| box = previousBox; |
| renderer = &box->renderer(); |
| offset = previousBox->rightmostCaretOffset(); |
| continue; |
| } |
| |
| unsigned char level = box->bidiLevel(); |
| auto previousBox = box->previousOnLine(); |
| |
| if (box->direction() == primaryDirection) { |
| if (!previousBox) { |
| auto logicalStart = primaryDirection == TextDirection::LTR |
| ? InlineIterator::firstLeafOnLineInLogicalOrderWithNode(box->lineBox(), orderCache) |
| : InlineIterator::lastLeafOnLineInLogicalOrderWithNode(box->lineBox(), orderCache); |
| if (logicalStart) { |
| box = logicalStart; |
| renderer = &box->renderer(); |
| offset = primaryDirection == TextDirection::LTR ? box->minimumCaretOffset() : box->maximumCaretOffset(); |
| } |
| break; |
| } |
| if (previousBox->bidiLevel() >= level) |
| break; |
| |
| level = previousBox->bidiLevel(); |
| |
| auto nextBox = box; |
| do { |
| nextBox.traverseNextOnLine(); |
| } while (nextBox && nextBox->bidiLevel() > level); |
| |
| if (nextBox && nextBox->bidiLevel() == level) |
| break; |
| |
| box = previousBox; |
| renderer = &box->renderer(); |
| offset = box->rightmostCaretOffset(); |
| if (box->direction() == primaryDirection) |
| break; |
| continue; |
| } |
| |
| while (previousBox && !previousBox->renderer().node()) |
| previousBox.traversePreviousOnLine(); |
| |
| if (previousBox) { |
| box = previousBox; |
| renderer = &box->renderer(); |
| offset = box->rightmostCaretOffset(); |
| if (box->bidiLevel() > level) { |
| do { |
| previousBox = previousBox.traversePreviousOnLine(); |
| } while (previousBox && previousBox->bidiLevel() > level); |
| |
| if (!previousBox || previousBox->bidiLevel() < level) |
| continue; |
| } |
| } else { |
| // Trailing edge of a secondary box. Set to the leading edge of the entire box. |
| while (true) { |
| while (auto nextBox = box->nextOnLine()) { |
| if (nextBox->bidiLevel() < level) |
| break; |
| box = nextBox; |
| } |
| if (box->bidiLevel() == level) |
| break; |
| level = box->bidiLevel(); |
| while (auto previousBox = box->previousOnLine()) { |
| if (previousBox->bidiLevel() < level) |
| break; |
| box = previousBox; |
| } |
| if (box->bidiLevel() == level) |
| break; |
| level = box->bidiLevel(); |
| } |
| renderer = &box->renderer(); |
| offset = primaryDirection == TextDirection::LTR ? box->minimumCaretOffset() : box->maximumCaretOffset(); |
| } |
| break; |
| } |
| |
| p = makeDeprecatedLegacyPosition(renderer->node(), offset); |
| |
| if ((p.isCandidate() && p.downstream() != downstreamStart) || p.atStartOfTree() || p.atEndOfTree()) |
| return p; |
| |
| ASSERT(p != m_deepPosition); |
| } |
| } |
| |
| VisiblePosition VisiblePosition::left(bool stayInEditableContent, bool* reachedBoundary) const |
| { |
| if (reachedBoundary) |
| *reachedBoundary = false; |
| Position pos = leftVisuallyDistinctCandidate(); |
| // FIXME: Why can't we move left from the last position in a tree? |
| if (pos.atStartOfTree() || pos.atEndOfTree()) { |
| if (reachedBoundary) |
| *reachedBoundary = true; |
| return VisiblePosition(); |
| } |
| |
| VisiblePosition left = pos; |
| ASSERT(left != *this); |
| |
| if (!stayInEditableContent) |
| return left; |
| |
| // FIXME: This may need to do something different from "before". |
| return honorEditingBoundaryAtOrBefore(left, reachedBoundary); |
| } |
| |
| Position VisiblePosition::rightVisuallyDistinctCandidate() const |
| { |
| Position p = m_deepPosition; |
| if (p.isNull()) |
| return Position(); |
| |
| Position downstreamStart = p.downstream(); |
| TextDirection primaryDirection = p.primaryDirection(); |
| |
| InlineIterator::LineLogicalOrderCache orderCache; |
| |
| while (true) { |
| auto [box, offset] = p.inlineBoxAndOffset(m_affinity, primaryDirection); |
| if (!box) |
| return primaryDirection == TextDirection::LTR ? nextVisuallyDistinctCandidate(m_deepPosition) : previousVisuallyDistinctCandidate(m_deepPosition); |
| |
| auto* renderer = &box->renderer(); |
| |
| while (true) { |
| if ((renderer->isReplacedOrInlineBlock() || renderer->isBR()) && offset == box->leftmostCaretOffset()) |
| return box->isLeftToRightDirection() ? nextVisuallyDistinctCandidate(m_deepPosition) : previousVisuallyDistinctCandidate(m_deepPosition); |
| |
| if (!renderer->node()) { |
| box.traverseNextOnLine(); |
| if (!box) |
| return primaryDirection == TextDirection::LTR ? nextVisuallyDistinctCandidate(m_deepPosition) : previousVisuallyDistinctCandidate(m_deepPosition); |
| renderer = &box->renderer(); |
| offset = box->leftmostCaretOffset(); |
| continue; |
| } |
| |
| // Note that this may underflow the (unsigned) offset. This is fine and handled below. |
| offset = box->isLeftToRightDirection() ? renderer->nextOffset(offset) : renderer->previousOffset(offset); |
| |
| auto caretMinOffset = box->minimumCaretOffset(); |
| auto caretMaxOffset = box->maximumCaretOffset(); |
| |
| if (offset > caretMinOffset && offset < caretMaxOffset) |
| break; |
| |
| if (offset != box->rightmostCaretOffset()) { |
| // Overshot to the right. |
| auto nextBox = box->nextOnLineIgnoringLineBreak(); |
| if (!nextBox) { |
| Position positionOnRight = primaryDirection == TextDirection::LTR ? nextVisuallyDistinctCandidate(m_deepPosition) : previousVisuallyDistinctCandidate(m_deepPosition); |
| auto boxOnRight = positionOnRight.inlineBoxAndOffset(m_affinity, primaryDirection).box; |
| if (boxOnRight && boxOnRight->lineBox() == box->lineBox()) |
| return Position(); |
| return positionOnRight; |
| } |
| |
| // 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->leftmostCaretOffset(); |
| continue; |
| } |
| |
| unsigned char level = box->bidiLevel(); |
| auto nextBox = box->nextOnLine(); |
| |
| if (box->direction() == primaryDirection) { |
| if (!nextBox) { |
| auto logicalEnd = primaryDirection == TextDirection::LTR |
| ? InlineIterator::lastLeafOnLineInLogicalOrderWithNode(box->lineBox(), orderCache) |
| : InlineIterator::firstLeafOnLineInLogicalOrderWithNode(box->lineBox(), orderCache); |
| |
| if (logicalEnd) { |
| box = logicalEnd; |
| renderer = &box->renderer(); |
| offset = primaryDirection == TextDirection::LTR ? box->maximumCaretOffset() : box->minimumCaretOffset(); |
| } |
| break; |
| } |
| |
| if (nextBox->bidiLevel() >= level) |
| break; |
| |
| level = nextBox->bidiLevel(); |
| |
| auto previousBox = box; |
| do { |
| previousBox.traversePreviousOnLine(); |
| } while (previousBox && previousBox->bidiLevel() > level); |
| |
| if (previousBox && previousBox->bidiLevel() == level) // For example, abc FED 123 ^ CBA |
| break; |
| |
| // For example, abc 123 ^ CBA or 123 ^ CBA abc |
| box = nextBox; |
| renderer = &box->renderer(); |
| offset = box->leftmostCaretOffset(); |
| if (box->direction() == primaryDirection) |
| break; |
| continue; |
| } |
| |
| while (nextBox && !nextBox->renderer().node()) |
| nextBox.traverseNextOnLine(); |
| |
| if (nextBox) { |
| box = nextBox; |
| renderer = &box->renderer(); |
| offset = box->leftmostCaretOffset(); |
| |
| if (box->bidiLevel() > level) { |
| do { |
| nextBox.traverseNextOnLine(); |
| } while (nextBox && nextBox->bidiLevel() > level); |
| |
| if (!nextBox || nextBox->bidiLevel() < level) |
| continue; |
| } |
| } else { |
| // Trailing edge of a secondary box. Set to the leading edge of the entire box. |
| while (true) { |
| while (auto previousBox = box->previousOnLine()) { |
| if (previousBox->bidiLevel() < level) |
| break; |
| box = previousBox; |
| } |
| if (box->bidiLevel() == level) |
| break; |
| level = box->bidiLevel(); |
| while (auto nextBox = box->nextOnLine()) { |
| if (nextBox->bidiLevel() < level) |
| break; |
| box = nextBox; |
| } |
| if (box->bidiLevel() == level) |
| break; |
| level = box->bidiLevel(); |
| } |
| renderer = &box->renderer(); |
| offset = primaryDirection == TextDirection::LTR ? box->maximumCaretOffset() : box->minimumCaretOffset(); |
| } |
| break; |
| } |
| |
| p = makeDeprecatedLegacyPosition(renderer->node(), offset); |
| |
| if ((p.isCandidate() && p.downstream() != downstreamStart) || p.atStartOfTree() || p.atEndOfTree()) |
| return p; |
| |
| ASSERT(p != m_deepPosition); |
| } |
| } |
| |
| VisiblePosition VisiblePosition::right(bool stayInEditableContent, bool* reachedBoundary) const |
| { |
| if (reachedBoundary) |
| *reachedBoundary = false; |
| Position pos = rightVisuallyDistinctCandidate(); |
| // FIXME: Why can't we move left from the last position in a tree? |
| if (pos.atStartOfTree() || pos.atEndOfTree()) { |
| if (reachedBoundary) |
| *reachedBoundary = true; |
| return VisiblePosition(); |
| } |
| |
| VisiblePosition right = pos; |
| ASSERT(right != *this); |
| |
| if (!stayInEditableContent) |
| return right; |
| |
| // FIXME: This may need to do something different from "after". |
| return honorEditingBoundaryAtOrAfter(right, reachedBoundary); |
| } |
| |
| VisiblePosition VisiblePosition::honorEditingBoundaryAtOrBefore(const VisiblePosition& position, bool* reachedBoundary) const |
| { |
| if (reachedBoundary) |
| *reachedBoundary = false; |
| if (position.isNull()) |
| return position; |
| |
| auto* highestRoot = highestEditableRoot(deepEquivalent()); |
| |
| // Return empty position if pos is not somewhere inside the editable region containing this position |
| if (highestRoot && !position.deepEquivalent().deprecatedNode()->isDescendantOf(*highestRoot)) { |
| if (reachedBoundary) |
| *reachedBoundary = true; |
| return VisiblePosition(); |
| } |
| |
| // Return position 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(position.deepEquivalent()) == highestRoot) { |
| if (reachedBoundary) |
| *reachedBoundary = *this == position; |
| return position; |
| } |
| |
| // Return empty position if this position is non-editable, but pos is editable |
| // FIXME: Move to the previous non-editable region. |
| if (!highestRoot) { |
| if (reachedBoundary) |
| *reachedBoundary = true; |
| return VisiblePosition(); |
| } |
| |
| // Return the last position before pos that is in the same editable region as this position |
| return lastEditablePositionBeforePositionInRoot(position.deepEquivalent(), highestRoot); |
| } |
| |
| VisiblePosition VisiblePosition::honorEditingBoundaryAtOrAfter(const VisiblePosition& otherPosition, bool* reachedBoundary) const |
| { |
| if (reachedBoundary) |
| *reachedBoundary = false; |
| if (otherPosition.isNull()) |
| return otherPosition; |
| |
| auto* highestRoot = highestEditableRoot(deepEquivalent()); |
| |
| // Return empty position if otherPosition is not somewhere inside the editable region containing this position |
| if (highestRoot && !otherPosition.deepEquivalent().deprecatedNode()->isDescendantOf(*highestRoot)) { |
| if (reachedBoundary) |
| *reachedBoundary = true; |
| return VisiblePosition(); |
| } |
| |
| // Return otherPosition 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(otherPosition.deepEquivalent()) == highestRoot) { |
| if (reachedBoundary) |
| *reachedBoundary = *this == otherPosition; |
| return otherPosition; |
| } |
| |
| // Return empty position if this position is non-editable, but otherPosition is editable |
| // FIXME: Move to the next non-editable region. |
| if (!highestRoot) { |
| if (reachedBoundary) |
| *reachedBoundary = true; |
| return VisiblePosition(); |
| } |
| |
| // Return the next position after pos that is in the same editable region as this position |
| return firstEditablePositionAfterPositionInRoot(otherPosition.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& passedPosition) |
| { |
| // The updateLayout call below can do so much that even the position passed |
| // in to us might get changed as a side effect. Specifically, there are code |
| // paths that pass selection endpoints, and updateLayout can change the selection. |
| Position position = passedPosition; |
| |
| // 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. |
| if (position.isNull()) |
| return Position(); |
| |
| ASSERT(position.document()); |
| position.document()->updateLayoutIgnorePendingStylesheets(); |
| |
| Node* node = position.containerNode(); |
| |
| 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.deprecatedNode(); |
| Node* prevNode = prev.deprecatedNode(); |
| |
| // 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 (is<HTMLHtmlElement>(node) && !node->hasEditableStyle()) { |
| auto* body = node->document().bodyOrFrameset(); |
| if (body && body->hasEditableStyle()) |
| 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)) || (node && (node->isDocumentNode() || node->isShadowRoot()))) |
| 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. |
| Element* originalBlock = deprecatedEnclosingBlockFlowElement(node); |
| 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(); |
| if (!pos.containerNode() || !pos.containerNode()->isTextNode()) |
| return 0; |
| switch (pos.anchorType()) { |
| case Position::PositionIsAfterChildren: |
| case Position::PositionIsAfterAnchor: |
| case Position::PositionIsBeforeAnchor: |
| case Position::PositionIsBeforeChildren: |
| return 0; |
| case Position::PositionIsOffsetInAnchor: |
| break; |
| } |
| unsigned offset = static_cast<unsigned>(pos.offsetInContainerNode()); |
| Text* textNode = pos.containerText(); |
| unsigned length = textNode->length(); |
| if (offset >= length) |
| return 0; |
| |
| UChar32 ch; |
| U16_NEXT(textNode->data(), offset, length, ch); |
| return ch; |
| } |
| |
| InlineBoxAndOffset VisiblePosition::inlineBoxAndOffset() const |
| { |
| return m_deepPosition.inlineBoxAndOffset(m_affinity); |
| } |
| |
| InlineBoxAndOffset VisiblePosition::inlineBoxAndOffset(TextDirection primaryDirection) const |
| { |
| return m_deepPosition.inlineBoxAndOffset(m_affinity, primaryDirection); |
| } |
| |
| auto VisiblePosition::localCaretRect() const -> LocalCaretRect |
| { |
| auto node = m_deepPosition.anchorNode(); |
| if (!node) |
| return { }; |
| |
| auto boxAndOffset = inlineBoxAndOffset(); |
| auto renderer = boxAndOffset.box ? &boxAndOffset.box->renderer() : node->renderer(); |
| if (!renderer) |
| return { }; |
| |
| return { computeLocalCaretRect(*renderer, boxAndOffset), const_cast<RenderObject*>(renderer) }; |
| } |
| |
| IntRect VisiblePosition::absoluteCaretBounds(bool* insideFixed) const |
| { |
| RenderBlock* renderer = nullptr; |
| LayoutRect localRect = localCaretRectInRendererForCaretPainting(*this, renderer); |
| return absoluteBoundsForLocalCaretRect(renderer, localRect, insideFixed); |
| } |
| |
| FloatRect VisiblePosition::absoluteSelectionBoundsForLine() const |
| { |
| auto box = inlineBoxAndOffset().box; |
| if (!box) |
| return { }; |
| |
| auto line = box->lineBox(); |
| return line->containingBlock().localToAbsoluteQuad(FloatRect { LineSelection::physicalRect(*line) }).boundingBox(); |
| } |
| |
| int VisiblePosition::lineDirectionPointForBlockDirectionNavigation() const |
| { |
| auto localRect = localCaretRect(); |
| if (localRect.rect.isEmpty() || !localRect.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'. |
| auto caretPoint = localRect.renderer->localToAbsolute(localRect.rect.location()); |
| RenderObject* containingBlock = localRect.renderer->containingBlock(); |
| if (!containingBlock) |
| containingBlock = localRect.renderer; // Just use ourselves to determine the writing mode if we have no containing block. |
| return containingBlock->isHorizontalWritingMode() ? caretPoint.x() : caretPoint.y(); |
| } |
| |
| #if ENABLE(TREE_DEBUGGING) |
| |
| void VisiblePosition::debugPosition(const char* msg) const |
| { |
| if (isNull()) |
| fprintf(stderr, "Position [%s]: null\n", msg); |
| else { |
| fprintf(stderr, "Position [%s]: %s, ", msg, m_deepPosition.deprecatedNode()->nodeName().utf8().data()); |
| m_deepPosition.showAnchorTypeAndOffset(); |
| } |
| } |
| |
| String VisiblePosition::debugDescription() const |
| { |
| return m_deepPosition.debugDescription(); |
| } |
| |
| void VisiblePosition::showTreeForThis() const |
| { |
| m_deepPosition.showTreeForThis(); |
| } |
| |
| #endif |
| |
| // FIXME: Maybe this should be deprecated too, like the underlying function? |
| Element* enclosingBlockFlowElement(const VisiblePosition& visiblePosition) |
| { |
| if (visiblePosition.isNull()) |
| return nullptr; |
| |
| return deprecatedEnclosingBlockFlowElement(visiblePosition.deepEquivalent().deprecatedNode()); |
| } |
| |
| bool isFirstVisiblePositionInNode(const VisiblePosition& visiblePosition, const Node* node) |
| { |
| if (visiblePosition.isNull()) |
| return false; |
| |
| if (!visiblePosition.deepEquivalent().containerNode()->isDescendantOf(node)) |
| return false; |
| |
| VisiblePosition previous = visiblePosition.previous(); |
| return previous.isNull() || !previous.deepEquivalent().deprecatedNode()->isDescendantOf(node); |
| } |
| |
| bool isLastVisiblePositionInNode(const VisiblePosition& visiblePosition, const Node* node) |
| { |
| if (visiblePosition.isNull()) |
| return false; |
| |
| if (!visiblePosition.deepEquivalent().containerNode()->isDescendantOf(node)) |
| return false; |
| |
| VisiblePosition next = visiblePosition.next(); |
| return next.isNull() || !next.deepEquivalent().deprecatedNode()->isDescendantOf(node); |
| } |
| |
| bool areVisiblePositionsInSameTreeScope(const VisiblePosition& a, const VisiblePosition& b) |
| { |
| return connectedInSameTreeScope(a.deepEquivalent().anchorNode(), b.deepEquivalent().anchorNode()); |
| } |
| |
| bool VisiblePosition::equals(const VisiblePosition& other) const |
| { |
| return m_affinity == other.m_affinity && m_deepPosition.equals(other.m_deepPosition); |
| } |
| |
| std::optional<BoundaryPoint> makeBoundaryPoint(const VisiblePosition& position) |
| { |
| return makeBoundaryPoint(position.deepEquivalent()); |
| } |
| |
| Node* commonInclusiveAncestor(const VisiblePosition& a, const VisiblePosition& b) |
| { |
| return commonInclusiveAncestor(a.deepEquivalent(), b.deepEquivalent()); |
| } |
| |
| TextStream& operator<<(TextStream& stream, Affinity affinity) |
| { |
| switch (affinity) { |
| case Affinity::Upstream: |
| stream << "upstream"; |
| break; |
| case Affinity::Downstream: |
| stream << "downstream"; |
| break; |
| } |
| return stream; |
| } |
| |
| TextStream& operator<<(TextStream& stream, const VisiblePosition& visiblePosition) |
| { |
| TextStream::GroupScope scope(stream); |
| stream << "VisiblePosition " << &visiblePosition; |
| |
| stream.dumpProperty("position", visiblePosition.deepEquivalent()); |
| stream.dumpProperty("affinity", visiblePosition.affinity()); |
| |
| return stream; |
| } |
| |
| std::optional<SimpleRange> makeSimpleRange(const VisiblePositionRange& range) |
| { |
| return makeSimpleRange(range.start, range.end); |
| } |
| |
| VisiblePositionRange makeVisiblePositionRange(const std::optional<SimpleRange>& range) |
| { |
| if (!range) |
| return { }; |
| return { makeContainerOffsetPosition(range->start), makeContainerOffsetPosition(range->end) }; |
| } |
| |
| PartialOrdering documentOrder(const VisiblePosition& a, const VisiblePosition& b) |
| { |
| // FIXME: Should two positions with different affinity be considered equivalent or not? |
| return treeOrder<ComposedTree>(a.deepEquivalent(), b.deepEquivalent()); |
| } |
| |
| bool intersects(const VisiblePositionRange& a, const VisiblePositionRange& b) |
| { |
| return a.start <= b.end && b.start <= a.end; |
| } |
| |
| bool contains(const VisiblePositionRange& range, const VisiblePosition& point) |
| { |
| return point >= range.start && point <= range.end; |
| } |
| |
| VisiblePositionRange intersection(const VisiblePositionRange& a, const VisiblePositionRange& b) |
| { |
| return { std::max(a.start, b.start), std::min(a.end, b.end) }; |
| } |
| |
| Node* commonInclusiveAncestor(const VisiblePositionRange& range) |
| { |
| return commonInclusiveAncestor(range.start, range.end); |
| } |
| |
| VisiblePosition midpoint(const VisiblePositionRange& range) |
| { |
| auto rootNode = commonInclusiveAncestor(range); |
| if (!rootNode) |
| return { }; |
| auto rootContainerNode = rootNode->isContainerNode() ? downcast<ContainerNode>(rootNode) : rootNode->parentNode(); |
| if (!rootContainerNode) |
| return { }; |
| auto scope = makeRangeSelectingNodeContents(*rootContainerNode); |
| auto characterRange = WebCore::characterRange(scope, *makeSimpleRange(range.start, range.end)); |
| return makeContainerOffsetPosition(resolveCharacterLocation(scope, characterRange.location + characterRange.length / 2)); |
| } |
| |
| } // namespace WebCore |
| |
| #if ENABLE(TREE_DEBUGGING) |
| |
| void showTree(const WebCore::VisiblePosition* vpos) |
| { |
| if (vpos) |
| vpos->showTreeForThis(); |
| } |
| |
| void showTree(const WebCore::VisiblePosition& vpos) |
| { |
| vpos.showTreeForThis(); |
| } |
| |
| #endif |
