VisiblePosition SelectionModifier::modifyMovingBackward( TextGranularity granularity) { VisiblePosition pos; switch (granularity) { case CharacterGranularity: if (m_selection.isRange()) pos = createVisiblePosition(m_selection.start(), m_selection.affinity()); else pos = previousPositionOf( createVisiblePosition(m_selection.extent(), m_selection.affinity()), CanSkipOverEditingBoundary); break; case WordGranularity: pos = previousWordPosition( createVisiblePosition(m_selection.extent(), m_selection.affinity())); break; case SentenceGranularity: pos = previousSentencePosition( createVisiblePosition(m_selection.extent(), m_selection.affinity())); break; case LineGranularity: pos = previousLinePosition( startForPlatform(), lineDirectionPointForBlockDirectionNavigation(START)); break; case ParagraphGranularity: pos = previousParagraphPosition( startForPlatform(), lineDirectionPointForBlockDirectionNavigation(START)); break; case SentenceBoundary: pos = startOfSentence(startForPlatform()); break; case LineBoundary: pos = logicalStartOfLine(startForPlatform()); break; case ParagraphBoundary: pos = startOfParagraph(startForPlatform()); break; case DocumentBoundary: pos = startForPlatform(); if (isEditablePosition(pos.deepEquivalent())) pos = startOfEditableContent(pos); else pos = startOfDocument(pos); break; } return pos; }
VisiblePosition SelectionModifier::modifyExtendingBackward( TextGranularity granularity) { VisiblePosition pos = createVisiblePosition(m_selection.extent(), m_selection.affinity()); // Extending a selection backward by word or character from just after a table // selects the table. This "makes sense" from the user perspective, esp. when // deleting. It was done here instead of in VisiblePosition because we want // VPs to iterate over everything. switch (granularity) { case CharacterGranularity: pos = previousPositionOf(pos, CanSkipOverEditingBoundary); break; case WordGranularity: pos = previousWordPosition(pos); break; case SentenceGranularity: pos = previousSentencePosition(pos); break; case LineGranularity: pos = previousLinePosition( pos, lineDirectionPointForBlockDirectionNavigation(EXTENT)); break; case ParagraphGranularity: pos = previousParagraphPosition( pos, lineDirectionPointForBlockDirectionNavigation(EXTENT)); break; case SentenceBoundary: pos = startOfSentence(startForPlatform()); break; case LineBoundary: pos = logicalStartOfLine(startForPlatform()); break; case ParagraphBoundary: pos = startOfParagraph(startForPlatform()); break; case DocumentBoundary: pos = startForPlatform(); if (isEditablePosition(pos.deepEquivalent())) pos = startOfEditableContent(pos); else pos = startOfDocument(pos); break; } adjustPositionForUserSelectAll(pos, !(directionOfEnclosingBlock() == LTR)); return pos; }
bool SelectionModifier::modifyWithPageGranularity(EAlteration alter, unsigned verticalDistance, VerticalDirection direction) { if (!verticalDistance) return false; DCHECK(!frame()->document()->needsLayoutTreeUpdate()); DocumentLifecycle::DisallowTransitionScope disallowTransition( frame()->document()->lifecycle()); willBeModified(alter, direction == FrameSelection::DirectionUp ? DirectionBackward : DirectionForward); VisiblePosition pos; LayoutUnit xPos; switch (alter) { case FrameSelection::AlterationMove: pos = createVisiblePosition(direction == FrameSelection::DirectionUp ? m_selection.start() : m_selection.end(), m_selection.affinity()); xPos = lineDirectionPointForBlockDirectionNavigation( direction == FrameSelection::DirectionUp ? START : END); m_selection.setAffinity(direction == FrameSelection::DirectionUp ? TextAffinity::Upstream : TextAffinity::Downstream); break; case FrameSelection::AlterationExtend: pos = createVisiblePosition(m_selection.extent(), m_selection.affinity()); xPos = lineDirectionPointForBlockDirectionNavigation(EXTENT); m_selection.setAffinity(TextAffinity::Downstream); break; } int startY; if (!absoluteCaretY(pos, startY)) return false; if (direction == FrameSelection::DirectionUp) startY = -startY; int lastY = startY; VisiblePosition result; VisiblePosition next; for (VisiblePosition p = pos;; p = next) { if (direction == FrameSelection::DirectionUp) next = previousLinePosition(p, xPos); else next = nextLinePosition(p, xPos); if (next.isNull() || next.deepEquivalent() == p.deepEquivalent()) break; int nextY; if (!absoluteCaretY(next, nextY)) break; if (direction == FrameSelection::DirectionUp) nextY = -nextY; if (nextY - startY > static_cast<int>(verticalDistance)) break; if (nextY >= lastY) { lastY = nextY; result = next; } } if (result.isNull()) return false; switch (alter) { case FrameSelection::AlterationMove: m_selection = createVisibleSelection( SelectionInDOMTree::Builder() .collapse(result.toPositionWithAffinity()) .setIsDirectional(m_selection.isDirectional()) .build()); break; case FrameSelection::AlterationExtend: m_selection.setExtent(result); break; } m_selection.setIsDirectional(shouldAlwaysUseDirectionalSelection(frame()) || alter == FrameSelection::AlterationExtend); return true; }
bool SelectionEditor::modify(EAlteration alter, unsigned verticalDistance, VerticalDirection direction, EUserTriggered userTriggered, CursorAlignOnScroll align) { if (!verticalDistance) return false; if (userTriggered == UserTriggered) { OwnPtrWillBeRawPtr<FrameSelection> trialFrameSelection = FrameSelection::create(); trialFrameSelection->setSelection(m_selection); trialFrameSelection->modify(alter, verticalDistance, direction, NotUserTriggered); } willBeModified(alter, direction == FrameSelection::DirectionUp ? DirectionBackward : DirectionForward); VisiblePosition pos; LayoutUnit xPos = 0; switch (alter) { case FrameSelection::AlterationMove: pos = createVisiblePosition(direction == FrameSelection::DirectionUp ? m_selection.start() : m_selection.end(), m_selection.affinity()); xPos = lineDirectionPointForBlockDirectionNavigation(direction == FrameSelection::DirectionUp ? START : END); m_selection.setAffinity(direction == FrameSelection::DirectionUp ? TextAffinity::Upstream : TextAffinity::Downstream); break; case FrameSelection::AlterationExtend: pos = createVisiblePosition(m_selection.extent(), m_selection.affinity()); xPos = lineDirectionPointForBlockDirectionNavigation(EXTENT); m_selection.setAffinity(TextAffinity::Downstream); break; } int startY; if (!absoluteCaretY(pos, startY)) return false; if (direction == FrameSelection::DirectionUp) startY = -startY; int lastY = startY; VisiblePosition result; VisiblePosition next; for (VisiblePosition p = pos; ; p = next) { if (direction == FrameSelection::DirectionUp) next = previousLinePosition(p, xPos); else next = nextLinePosition(p, xPos); if (next.isNull() || next.deepEquivalent() == p.deepEquivalent()) break; int nextY; if (!absoluteCaretY(next, nextY)) break; if (direction == FrameSelection::DirectionUp) nextY = -nextY; if (nextY - startY > static_cast<int>(verticalDistance)) break; if (nextY >= lastY) { lastY = nextY; result = next; } } if (result.isNull()) return false; switch (alter) { case FrameSelection::AlterationMove: m_frameSelection->moveTo(result, userTriggered, align); break; case FrameSelection::AlterationExtend: m_frameSelection->setExtent(result, userTriggered); break; } m_selection.setIsDirectional(shouldAlwaysUseDirectionalSelection(frame()) || alter == FrameSelection::AlterationExtend); return true; }