bool
ContentCacheInParent::GetCaretRect(uint32_t aOffset,
LayoutDeviceIntRect& aCaretRect) const
{
MOZ_LOG(sContentCacheLog, LogLevel::Info,
("ContentCacheInParent: 0x%p GetCaretRect(aOffset=%u), "
"mCaret={ mOffset=%u, mRect=%s, IsValid()=%s }, mTextRectArray={ "
"mStart=%u, mRects.Length()=%u }, mSelection={ mAnchor=%u, mFocus=%u, "
"mWritingMode=%s, mAnchorCharRect=%s, mFocusCharRect=%s }, "
"mFirstCharRect=%s",
this, aOffset, mCaret.mOffset, GetRectText(mCaret.mRect).get(),
GetBoolName(mCaret.IsValid()), mTextRectArray.mStart,
mTextRectArray.mRects.Length(), mSelection.mAnchor, mSelection.mFocus,
GetWritingModeName(mSelection.mWritingMode).get(),
GetRectText(mSelection.mAnchorCharRect).get(),
GetRectText(mSelection.mFocusCharRect).get(),
GetRectText(mFirstCharRect).get()));
if (mCaret.IsValid() && mCaret.mOffset == aOffset) {
aCaretRect = mCaret.mRect;
return true;
}
// Guess caret rect from the text rect if it's stored.
if (!GetTextRect(aOffset, aCaretRect)) {
// There might be previous character rect in the cache. If so, we can
// guess the caret rect with it.
if (!aOffset || !GetTextRect(aOffset - 1, aCaretRect)) {
aCaretRect.SetEmpty();
return false;
}
if (mSelection.mWritingMode.IsVertical()) {
aCaretRect.y = aCaretRect.YMost();
} else {
// XXX bidi-unaware.
aCaretRect.x = aCaretRect.XMost();
}
}
// XXX This is not bidi aware because we don't cache each character's
// direction. However, this is usually used by IME, so, assuming the
// character is in LRT context must not cause any problem.
if (mSelection.mWritingMode.IsVertical()) {
aCaretRect.height = mCaret.IsValid() ? mCaret.mRect.height : 1;
} else {
aCaretRect.width = mCaret.IsValid() ? mCaret.mRect.width : 1;
}
return true;
}
