void SelectionAdjuster::adjustSelectionInDOMTree(VisibleSelection* selection, const VisibleSelectionInFlatTree& selectionInFlatTree)
{
if (selectionInFlatTree.isNone()) {
*selection = VisibleSelection();
return;
}
const Position& base = toPositionInDOMTree(selectionInFlatTree.base());
const Position& extent = toPositionInDOMTree(selectionInFlatTree.extent());
if (isCrossingShadowBoundaries(selectionInFlatTree)) {
*selection = VisibleSelection(base, extent);
return;
}
const Position& position1 = toPositionInDOMTree(selectionInFlatTree.start());
const Position& position2 = toPositionInDOMTree(selectionInFlatTree.end());
selection->m_base = base;
selection->m_extent = extent;
selection->m_affinity = selectionInFlatTree.m_affinity;
selection->m_isDirectional = selectionInFlatTree.m_isDirectional;
selection->m_granularity = selectionInFlatTree.m_granularity;
selection->m_hasTrailingWhitespace = selectionInFlatTree.m_hasTrailingWhitespace;
selection->m_baseIsFirst = base.isNull() || base.compareTo(extent) <= 0;
if (position1.compareTo(position2) <= 0) {
selection->m_start = position1;
selection->m_end = position2;
} else {
selection->m_start = position2;
selection->m_end = position1;
}
selection->updateSelectionType();
selection->didChange();
}
static bool isCrossingShadowBoundaries(
const VisibleSelectionInFlatTree& selection) {
if (!selection.isRange())
return false;
TreeScope& treeScope = selection.base().anchorNode()->treeScope();
return selection.extent().anchorNode()->treeScope() != treeScope ||
selection.start().anchorNode()->treeScope() != treeScope ||
selection.end().anchorNode()->treeScope() != treeScope;
}
TEST_F(SelectionAdjusterTest, adjustSelectionInFlatTree)
{
setBodyContent("<div id=sample>foo</div>");
MockVisibleSelectionChangeObserver selectionObserver;
VisibleSelectionInFlatTree selectionInFlatTree;
selectionInFlatTree.setChangeObserver(selectionObserver);
Node* const sample = document().getElementById("sample");
Node* const foo = sample->firstChild();
// Select "foo"
VisibleSelection selection(Position(foo, 0), Position(foo, 3));
SelectionAdjuster::adjustSelectionInFlatTree(&selectionInFlatTree, selection);
EXPECT_EQ(PositionInFlatTree(foo, 0), selectionInFlatTree.start());
EXPECT_EQ(PositionInFlatTree(foo, 3), selectionInFlatTree.end());
EXPECT_EQ(1, selectionObserver.callCounter()) << "adjustSelectionInFlatTree() should call didChangeVisibleSelection()";
}
// TODO(yosin): We should make |adjustSelectionInDOMTree()| to return
// |VisibleSelection| once |VisibleSelection| constructor doesn't call
// |validate()|.
void SelectionAdjuster::adjustSelectionInDOMTree(
VisibleSelection* selection,
const VisibleSelectionInFlatTree& selectionInFlatTree) {
if (selectionInFlatTree.isNone()) {
*selection = VisibleSelection();
return;
}
const Position& base = toPositionInDOMTree(selectionInFlatTree.base());
const Position& extent = toPositionInDOMTree(selectionInFlatTree.extent());
if (isCrossingShadowBoundaries(selectionInFlatTree)) {
DCHECK(base.document());
// TODO(xiaochengh): The use of updateStyleAndLayoutIgnorePendingStylesheets
// needs to be audited. See http://crbug.com/590369 for more details.
// This layout update call cannot be hoisted out of the |if|, otherwise it's
// going to cause performance regression (http://crbug.com/652301).
// TODO(yosin): Implement and apply lazy visible selection validation so
// that we don't need to update layout here.
base.document()->updateStyleAndLayoutIgnorePendingStylesheets();
*selection = createVisibleSelection(
SelectionInDOMTree::Builder().setBaseAndExtent(base, extent).build());
return;
}
const Position& position1 = toPositionInDOMTree(selectionInFlatTree.start());
const Position& position2 = toPositionInDOMTree(selectionInFlatTree.end());
selection->m_base = base;
selection->m_extent = extent;
selection->m_affinity = selectionInFlatTree.m_affinity;
selection->m_isDirectional = selectionInFlatTree.m_isDirectional;
selection->m_granularity = selectionInFlatTree.m_granularity;
selection->m_hasTrailingWhitespace =
selectionInFlatTree.m_hasTrailingWhitespace;
selection->m_baseIsFirst = base.isNull() || base.compareTo(extent) <= 0;
if (position1.compareTo(position2) <= 0) {
selection->m_start = position1;
selection->m_end = position2;
} else {
selection->m_start = position2;
selection->m_end = position1;
}
selection->updateSelectionType();
}