bool SelectionModifier::modify(EAlteration alter,
SelectionDirection direction,
TextGranularity granularity) {
DCHECK(!frame()->document()->needsLayoutTreeUpdate());
DocumentLifecycle::DisallowTransitionScope disallowTransition(
frame()->document()->lifecycle());
willBeModified(alter, direction);
bool wasRange = m_selection.isRange();
VisiblePosition originalStartPosition = m_selection.visibleStart();
VisiblePosition position;
switch (direction) {
case DirectionRight:
if (alter == FrameSelection::AlterationMove)
position = modifyMovingRight(granularity);
else
position = modifyExtendingRight(granularity);
break;
case DirectionForward:
if (alter == FrameSelection::AlterationExtend)
position = modifyExtendingForward(granularity);
else
position = modifyMovingForward(granularity);
break;
case DirectionLeft:
if (alter == FrameSelection::AlterationMove)
position = modifyMovingLeft(granularity);
else
position = modifyExtendingLeft(granularity);
break;
case DirectionBackward:
if (alter == FrameSelection::AlterationExtend)
position = modifyExtendingBackward(granularity);
else
position = modifyMovingBackward(granularity);
break;
}
if (position.isNull())
return false;
if (isSpatialNavigationEnabled(frame())) {
if (!wasRange && alter == FrameSelection::AlterationMove &&
position.deepEquivalent() == originalStartPosition.deepEquivalent())
return false;
}
// Some of the above operations set an xPosForVerticalArrowNavigation.
// Setting a selection will clear it, so save it to possibly restore later.
// Note: the START position type is arbitrary because it is unused, it would
// be the requested position type if there were no
// xPosForVerticalArrowNavigation set.
LayoutUnit x = lineDirectionPointForBlockDirectionNavigation(START);
m_selection.setIsDirectional(shouldAlwaysUseDirectionalSelection(frame()) ||
alter == FrameSelection::AlterationExtend);
switch (alter) {
case FrameSelection::AlterationMove:
m_selection = createVisibleSelection(
SelectionInDOMTree::Builder()
.collapse(position.toPositionWithAffinity())
.setIsDirectional(m_selection.isDirectional())
.build());
break;
case FrameSelection::AlterationExtend:
if (!m_selection.isCaret() && (granularity == WordGranularity ||
granularity == ParagraphGranularity ||
granularity == LineGranularity) &&
frame() &&
!frame()
->editor()
.behavior()
.shouldExtendSelectionByWordOrLineAcrossCaret()) {
// Don't let the selection go across the base position directly. Needed
// to match mac behavior when, for instance, word-selecting backwards
// starting with the caret in the middle of a word and then
// word-selecting forward, leaving the caret in the same place where it
// was, instead of directly selecting to the end of the word.
VisibleSelection newSelection = m_selection;
newSelection.setExtent(position);
if (m_selection.isBaseFirst() != newSelection.isBaseFirst())
position = m_selection.visibleBase();
}
// Standard Mac behavior when extending to a boundary is grow the
// selection rather than leaving the base in place and moving the
// extent. Matches NSTextView.
if (!frame() ||
!frame()
->editor()
.behavior()
.shouldAlwaysGrowSelectionWhenExtendingToBoundary() ||
m_selection.isCaret() || !isBoundary(granularity)) {
m_selection.setExtent(position);
} else {
TextDirection textDirection = directionOfEnclosingBlock();
if (direction == DirectionForward ||
(textDirection == LTR && direction == DirectionRight) ||
(textDirection == RTL && direction == DirectionLeft))
setSelectionEnd(&m_selection, position);
else
setSelectionStart(&m_selection, position);
}
break;
}
if (granularity == LineGranularity || granularity == ParagraphGranularity)
m_xPosForVerticalArrowNavigation = x;
return true;
}
bool SelectionEditor::modify(EAlteration alter, SelectionDirection direction, TextGranularity granularity, EUserTriggered userTriggered)
{
if (userTriggered == UserTriggered) {
OwnPtrWillBeRawPtr<FrameSelection> trialFrameSelection = FrameSelection::create();
trialFrameSelection->setSelection(m_selection);
trialFrameSelection->modify(alter, direction, granularity, NotUserTriggered);
if (trialFrameSelection->selection().isRange() && m_selection.isCaret() && !dispatchSelectStart())
return false;
}
willBeModified(alter, direction);
bool wasRange = m_selection.isRange();
VisiblePosition originalStartPosition = m_selection.visibleStart();
VisiblePosition position;
switch (direction) {
case DirectionRight:
if (alter == FrameSelection::AlterationMove)
position = modifyMovingRight(granularity);
else
position = modifyExtendingRight(granularity);
break;
case DirectionForward:
if (alter == FrameSelection::AlterationExtend)
position = modifyExtendingForward(granularity);
else
position = modifyMovingForward(granularity);
break;
case DirectionLeft:
if (alter == FrameSelection::AlterationMove)
position = modifyMovingLeft(granularity);
else
position = modifyExtendingLeft(granularity);
break;
case DirectionBackward:
if (alter == FrameSelection::AlterationExtend)
position = modifyExtendingBackward(granularity);
else
position = modifyMovingBackward(granularity);
break;
}
if (position.isNull())
return false;
if (isSpatialNavigationEnabled(frame())) {
if (!wasRange && alter == FrameSelection::AlterationMove && position.deepEquivalent() == originalStartPosition.deepEquivalent())
return false;
}
// Some of the above operations set an xPosForVerticalArrowNavigation.
// Setting a selection will clear it, so save it to possibly restore later.
// Note: the START position type is arbitrary because it is unused, it would be
// the requested position type if there were no xPosForVerticalArrowNavigation set.
LayoutUnit x = lineDirectionPointForBlockDirectionNavigation(START);
m_selection.setIsDirectional(shouldAlwaysUseDirectionalSelection(frame()) || alter == FrameSelection::AlterationExtend);
switch (alter) {
case FrameSelection::AlterationMove:
m_frameSelection->moveTo(position, userTriggered);
break;
case FrameSelection::AlterationExtend:
if (!m_selection.isCaret()
&& (granularity == WordGranularity || granularity == ParagraphGranularity || granularity == LineGranularity)
&& frame() && !frame()->editor().behavior().shouldExtendSelectionByWordOrLineAcrossCaret()) {
// Don't let the selection go across the base position directly. Needed to match mac
// behavior when, for instance, word-selecting backwards starting with the caret in
// the middle of a word and then word-selecting forward, leaving the caret in the
// same place where it was, instead of directly selecting to the end of the word.
VisibleSelection newSelection = m_selection;
newSelection.setExtent(position);
if (m_selection.isBaseFirst() != newSelection.isBaseFirst())
position = m_selection.visibleBase();
}
// Standard Mac behavior when extending to a boundary is grow the
// selection rather than leaving the base in place and moving the
// extent. Matches NSTextView.
if (!frame() || !frame()->editor().behavior().shouldAlwaysGrowSelectionWhenExtendingToBoundary()
|| m_selection.isCaret()
|| !isBoundary(granularity)) {
m_frameSelection->setExtent(position, userTriggered);
} else {
TextDirection textDirection = directionOfEnclosingBlock();
if (direction == DirectionForward || (textDirection == LTR && direction == DirectionRight) || (textDirection == RTL && direction == DirectionLeft))
m_frameSelection->setEnd(position, userTriggered);
else
m_frameSelection->setStart(position, userTriggered);
}
break;
}
if (granularity == LineGranularity || granularity == ParagraphGranularity)
m_xPosForVerticalArrowNavigation = x;
return true;
}