VisibleSelection SurroundingTextTest::select(int start, int end)
{
Element* element = document().getElementById("selection");
VisibleSelection selection;
selection.setBase(Position(toText(element->firstChild()), start));
selection.setExtent(Position(toText(element->firstChild()), end));
return selection;
}
int Frame::checkOverflowScroll(OverflowScrollAction action)
{
Position extent = selection().selection().extent();
if (extent.isNull())
return OverflowScrollNone;
RenderObject* renderer = extent.deprecatedNode()->renderer();
if (!renderer)
return OverflowScrollNone;
FrameView* view = this->view();
if (!view)
return OverflowScrollNone;
RenderBlock* containingBlock = renderer->containingBlock();
if (!containingBlock || !containingBlock->hasOverflowClip())
return OverflowScrollNone;
RenderLayer* layer = containingBlock->layer();
ASSERT(layer);
IntRect visibleRect = IntRect(view->scrollX(), view->scrollY(), view->visibleWidth(), view->visibleHeight());
IntPoint position = m_overflowAutoScrollPos;
if (visibleRect.contains(position.x(), position.y()))
return OverflowScrollNone;
int scrollType = 0;
int deltaX = 0;
int deltaY = 0;
IntPoint selectionPosition;
// This constant will make the selection draw a little bit beyond the edge of the visible area.
// This prevents a visual glitch, in that you can fail to select a portion of a character that
// is being rendered right at the edge of the visible rectangle.
// FIXME: This probably needs improvement, and may need to take the font size into account.
static const int scrollBoundsAdjustment = 3;
// FIXME: Make a small buffer at the end of a visible rectangle so that autoscrolling works
// even if the visible extends to the limits of the screen.
if (position.x() < visibleRect.x()) {
scrollType |= OverflowScrollLeft;
if (action == PerformOverflowScroll) {
deltaX -= static_cast<int>(m_overflowAutoScrollDelta);
selectionPosition.setX(view->scrollX() - scrollBoundsAdjustment);
}
} else if (position.x() > visibleRect.maxX()) {
scrollType |= OverflowScrollRight;
if (action == PerformOverflowScroll) {
deltaX += static_cast<int>(m_overflowAutoScrollDelta);
selectionPosition.setX(view->scrollX() + view->visibleWidth() + scrollBoundsAdjustment);
}
}
if (position.y() < visibleRect.y()) {
scrollType |= OverflowScrollUp;
if (action == PerformOverflowScroll) {
deltaY -= static_cast<int>(m_overflowAutoScrollDelta);
selectionPosition.setY(view->scrollY() - scrollBoundsAdjustment);
}
} else if (position.y() > visibleRect.maxY()) {
scrollType |= OverflowScrollDown;
if (action == PerformOverflowScroll) {
deltaY += static_cast<int>(m_overflowAutoScrollDelta);
selectionPosition.setY(view->scrollY() + view->visibleHeight() + scrollBoundsAdjustment);
}
}
Ref<Frame> protectedThis(*this);
if (action == PerformOverflowScroll && (deltaX || deltaY)) {
layer->scrollToOffset(layer->scrollOffset() + IntSize(deltaX, deltaY));
// Handle making selection.
VisiblePosition visiblePosition(renderer->positionForPoint(selectionPosition, nullptr));
if (visiblePosition.isNotNull()) {
VisibleSelection visibleSelection = selection().selection();
visibleSelection.setExtent(visiblePosition);
if (selection().granularity() != CharacterGranularity)
visibleSelection.expandUsingGranularity(selection().granularity());
if (selection().shouldChangeSelection(visibleSelection))
selection().setSelection(visibleSelection);
}
m_overflowAutoScrollDelta *= 1.02f; // Accelerate the scroll
}
return scrollType;
}
VisibleSelection DirectionGranularityStrategy::updateExtent(
const IntPoint& extentPoint,
LocalFrame* frame) {
const VisibleSelection& selection = frame->selection().selection();
if (m_state == StrategyState::Cleared)
m_state = StrategyState::Expanding;
VisiblePosition oldOffsetExtentPosition = selection.visibleExtent();
IntPoint oldExtentLocation = positionLocation(oldOffsetExtentPosition);
IntPoint oldOffsetExtentPoint =
oldExtentLocation + m_diffExtentPointFromExtentPosition;
IntPoint oldExtentPoint =
IntPoint(oldOffsetExtentPoint.x() - m_offset, oldOffsetExtentPoint.y());
// Apply the offset.
IntPoint newOffsetExtentPoint = extentPoint;
int dx = extentPoint.x() - oldExtentPoint.x();
if (m_offset != 0) {
if (m_offset > 0 && dx > 0)
m_offset = std::max(0, m_offset - dx);
else if (m_offset < 0 && dx < 0)
m_offset = std::min(0, m_offset - dx);
newOffsetExtentPoint.move(m_offset, 0);
}
VisiblePosition newOffsetExtentPosition =
visiblePositionForContentsPoint(newOffsetExtentPoint, frame);
IntPoint newOffsetLocation = positionLocation(newOffsetExtentPosition);
// Reset the offset in case of a vertical change in the location (could be
// due to a line change or due to an unusual layout, e.g. rotated text).
bool verticalChange = newOffsetLocation.y() != oldExtentLocation.y();
if (verticalChange) {
m_offset = 0;
m_granularity = CharacterGranularity;
newOffsetExtentPoint = extentPoint;
newOffsetExtentPosition =
visiblePositionForContentsPoint(extentPoint, frame);
}
const VisiblePosition base = selection.visibleBase();
// Do not allow empty selection.
if (newOffsetExtentPosition.deepEquivalent() == base.deepEquivalent())
return selection;
// The direction granularity strategy, particularly the "offset" feature
// doesn't work with non-horizontal text (e.g. when the text is rotated).
// So revert to the behavior equivalent to the character granularity
// strategy if we detect that the text's baseline coordinate changed
// without a line change.
if (verticalChange &&
inSameLine(newOffsetExtentPosition, oldOffsetExtentPosition)) {
return createVisibleSelection(selection.visibleBase(),
newOffsetExtentPosition);
}
int oldExtentBaseOrder = selection.isBaseFirst() ? 1 : -1;
int newExtentBaseOrder;
bool thisMoveShrunkSelection;
if (newOffsetExtentPosition.deepEquivalent() ==
oldOffsetExtentPosition.deepEquivalent()) {
if (m_granularity == CharacterGranularity)
return selection;
// If we are in Word granularity, we cannot exit here, since we may pass
// the middle of the word without changing the position (in which case
// the selection needs to expand).
thisMoveShrunkSelection = false;
newExtentBaseOrder = oldExtentBaseOrder;
} else {
bool selectionExpanded = arePositionsInSpecifiedOrder(
newOffsetExtentPosition, oldOffsetExtentPosition, oldExtentBaseOrder);
bool extentBaseOrderSwitched =
selectionExpanded
? false
: !arePositionsInSpecifiedOrder(newOffsetExtentPosition, base,
oldExtentBaseOrder);
newExtentBaseOrder =
extentBaseOrderSwitched ? -oldExtentBaseOrder : oldExtentBaseOrder;
// Determine the word boundary, i.e. the boundary extending beyond which
// should change the granularity to WordGranularity.
VisiblePosition wordBoundary;
if (extentBaseOrderSwitched) {
// Special case.
// If the extent-base order was switched, then the selection is now
// expanding in a different direction than before. Therefore we
// calculate the word boundary in this new direction and based on
// the |base| position.
wordBoundary = nextWordBound(base, newExtentBaseOrder > 0
? SearchDirection::SearchForward
: SearchDirection::SearchBackwards,
BoundAdjust::NextBoundIfOnBound);
m_granularity = CharacterGranularity;
} else {
// Calculate the word boundary based on |oldExtentWithGranularity|.
// If selection was shrunk in the last update and the extent is now
// exactly on the word boundary - we need to take the next bound as
// the bound of the current word.
wordBoundary = nextWordBound(oldOffsetExtentPosition,
oldExtentBaseOrder > 0
? SearchDirection::SearchForward
: SearchDirection::SearchBackwards,
m_state == StrategyState::Shrinking
? BoundAdjust::NextBoundIfOnBound
: BoundAdjust::CurrentPosIfOnBound);
}
bool expandedBeyondWordBoundary;
if (selectionExpanded)
expandedBeyondWordBoundary = arePositionsInSpecifiedOrder(
newOffsetExtentPosition, wordBoundary, newExtentBaseOrder);
else if (extentBaseOrderSwitched)
expandedBeyondWordBoundary = arePositionsInSpecifiedOrder(
newOffsetExtentPosition, wordBoundary, newExtentBaseOrder);
else
expandedBeyondWordBoundary = false;
// The selection is shrunk if the extent changes position to be closer to
// the base, and the extent/base order wasn't switched.
thisMoveShrunkSelection = !extentBaseOrderSwitched && !selectionExpanded;
if (expandedBeyondWordBoundary)
m_granularity = WordGranularity;
else if (thisMoveShrunkSelection)
m_granularity = CharacterGranularity;
}
VisiblePosition newSelectionExtent = newOffsetExtentPosition;
if (m_granularity == WordGranularity) {
// Determine the bounds of the word where the extent is located.
// Set the selection extent to one of the two bounds depending on
// whether the extent is passed the middle of the word.
VisiblePosition boundBeforeExtent =
nextWordBound(newOffsetExtentPosition, SearchDirection::SearchBackwards,
BoundAdjust::CurrentPosIfOnBound);
VisiblePosition boundAfterExtent =
nextWordBound(newOffsetExtentPosition, SearchDirection::SearchForward,
BoundAdjust::CurrentPosIfOnBound);
int xMiddleBetweenBounds = (positionLocation(boundAfterExtent).x() +
positionLocation(boundBeforeExtent).x()) /
2;
bool offsetExtentBeforeMiddle =
newOffsetExtentPoint.x() < xMiddleBetweenBounds;
newSelectionExtent =
offsetExtentBeforeMiddle ? boundBeforeExtent : boundAfterExtent;
// Update the offset if selection expanded in word granularity.
if (newSelectionExtent.deepEquivalent() !=
selection.visibleExtent().deepEquivalent() &&
((newExtentBaseOrder > 0 && !offsetExtentBeforeMiddle) ||
(newExtentBaseOrder < 0 && offsetExtentBeforeMiddle))) {
m_offset = positionLocation(newSelectionExtent).x() - extentPoint.x();
}
}
// Only update the state if the selection actually changed as a result of
// this move.
if (newSelectionExtent.deepEquivalent() !=
selection.visibleExtent().deepEquivalent())
m_state = thisMoveShrunkSelection ? StrategyState::Shrinking
: StrategyState::Expanding;
m_diffExtentPointFromExtentPosition =
extentPoint + IntSize(m_offset, 0) - positionLocation(newSelectionExtent);
VisibleSelection newSelection = selection;
newSelection.setExtent(newSelectionExtent);
return newSelection;
}
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;
}
