bool
TextRange::Crop(Accessible* aContainer)
{
uint32_t boundaryPos = 0, containerPos = 0;
AutoTArray<Accessible*, 30> boundaryParents, containerParents;
// Crop the start boundary.
Accessible* container = nullptr;
Accessible* boundary = mStartContainer->GetChildAtOffset(mStartOffset);
if (boundary != aContainer) {
CommonParent(boundary, aContainer, &boundaryParents, &boundaryPos,
&containerParents, &containerPos);
if (boundaryPos == 0) {
if (containerPos != 0) {
// The container is contained by the start boundary, reduce the range to
// the point starting at the container.
aContainer->ToTextPoint(mStartContainer.StartAssignment(), &mStartOffset);
static_cast<Accessible*>(mStartContainer)->AddRef();
}
else {
// The start boundary and the container are siblings.
container = aContainer;
}
}
else if (containerPos != 0) {
// The container does not contain the start boundary.
boundary = boundaryParents[boundaryPos];
container = containerParents[containerPos];
}
if (container) {
// If the range start is after the container, then make the range invalid.
if (boundary->IndexInParent() > container->IndexInParent()) {
return !!(mRoot = nullptr);
}
// If the range starts before the container, then reduce the range to
// the point starting at the container.
if (boundary->IndexInParent() < container->IndexInParent()) {
container->ToTextPoint(mStartContainer.StartAssignment(), &mStartOffset);
mStartContainer.get()->AddRef();
}
}
boundaryParents.SetLengthAndRetainStorage(0);
containerParents.SetLengthAndRetainStorage(0);
}
boundary = mEndContainer->GetChildAtOffset(mEndOffset);
if (boundary == aContainer) {
return true;
}
// Crop the end boundary.
container = nullptr;
CommonParent(boundary, aContainer, &boundaryParents, &boundaryPos,
&containerParents, &containerPos);
if (boundaryPos == 0) {
if (containerPos != 0) {
aContainer->ToTextPoint(mEndContainer.StartAssignment(), &mEndOffset, false);
static_cast<Accessible*>(mEndContainer)->AddRef();
}
else {
container = aContainer;
}
}
else if (containerPos != 0) {
boundary = boundaryParents[boundaryPos];
container = containerParents[containerPos];
}
if (!container) {
return true;
}
if (boundary->IndexInParent() < container->IndexInParent()) {
return !!(mRoot = nullptr);
}
if (boundary->IndexInParent() > container->IndexInParent()) {
container->ToTextPoint(mEndContainer.StartAssignment(), &mEndOffset, false);
static_cast<Accessible*>(mEndContainer)->AddRef();
}
return true;
}
