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; }