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;
}
