void SelectionModifier::willBeModified(EAlteration alter,
SelectionDirection direction) {
if (alter != FrameSelection::AlterationExtend)
return;
Position start = m_selection.start();
Position end = m_selection.end();
bool baseIsStart = true;
if (m_selection.isDirectional()) {
// Make base and extent match start and end so we extend the user-visible
// selection. This only matters for cases where base and extend point to
// different positions than start and end (e.g. after a double-click to
// select a word).
if (m_selection.isBaseFirst())
baseIsStart = true;
else
baseIsStart = false;
} else {
switch (direction) {
case DirectionRight:
if (directionOfSelection() == LTR)
baseIsStart = true;
else
baseIsStart = false;
break;
case DirectionForward:
baseIsStart = true;
break;
case DirectionLeft:
if (directionOfSelection() == LTR)
baseIsStart = false;
else
baseIsStart = true;
break;
case DirectionBackward:
baseIsStart = false;
break;
}
}
if (baseIsStart) {
m_selection.setBase(start);
m_selection.setExtent(end);
} else {
m_selection.setBase(end);
m_selection.setExtent(start);
}
}
VisiblePosition SelectionEditor::modifyMovingLeft(TextGranularity granularity)
{
VisiblePosition pos;
switch (granularity) {
case CharacterGranularity:
if (m_selection.isRange()) {
if (directionOfSelection() == LTR)
pos = createVisiblePosition(m_selection.start(), m_selection.affinity());
else
pos = createVisiblePosition(m_selection.end(), m_selection.affinity());
} else {
pos = leftPositionOf(createVisiblePosition(m_selection.extent(), m_selection.affinity()));
}
break;
case WordGranularity: {
bool skipsSpaceWhenMovingRight = frame() && frame()->editor().behavior().shouldSkipSpaceWhenMovingRight();
pos = leftWordPosition(createVisiblePosition(m_selection.extent(), m_selection.affinity()), skipsSpaceWhenMovingRight);
break;
}
case SentenceGranularity:
case LineGranularity:
case ParagraphGranularity:
case SentenceBoundary:
case ParagraphBoundary:
case DocumentBoundary:
// FIXME: Implement all of the above.
pos = modifyMovingBackward(granularity);
break;
case LineBoundary:
pos = leftBoundaryOfLine(startForPlatform(), directionOfEnclosingBlock());
break;
}
return pos;
}
