C++ LayoutDeviceIntRect::SetEmpty方法代码示例

bool
ContentCacheInParent::GetTextRect(uint32_t aOffset,
                                  LayoutDeviceIntRect& aTextRect) const
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("ContentCacheInParent: 0x%p GetTextRect(aOffset=%u), "
     "mTextRectArray={ mStart=%u, mRects.Length()=%u }, "
     "mSelection={ mAnchor=%u, mFocus=%u }",
     this, aOffset, mTextRectArray.mStart, mTextRectArray.mRects.Length(),
     mSelection.mAnchor, mSelection.mFocus));

  if (!aOffset) {
    NS_WARN_IF(mFirstCharRect.IsEmpty());
    aTextRect = mFirstCharRect;
    return !aTextRect.IsEmpty();
  }
  if (aOffset == mSelection.mAnchor) {
    NS_WARN_IF(mSelection.mAnchorCharRect.IsEmpty());
    aTextRect = mSelection.mAnchorCharRect;
    return !aTextRect.IsEmpty();
  }
  if (aOffset == mSelection.mFocus) {
    NS_WARN_IF(mSelection.mFocusCharRect.IsEmpty());
    aTextRect = mSelection.mFocusCharRect;
    return !aTextRect.IsEmpty();
  }

  if (!mTextRectArray.InRange(aOffset)) {
    aTextRect.SetEmpty();
    return false;
  }
  aTextRect = mTextRectArray.GetRect(aOffset);
  return true;
}

bool
ContentCacheInChild::QueryCharRect(nsIWidget* aWidget,
                                   uint32_t aOffset,
                                   LayoutDeviceIntRect& aCharRect) const
{
  aCharRect.SetEmpty();

  nsEventStatus status = nsEventStatus_eIgnore;
  WidgetQueryContentEvent textRect(true, NS_QUERY_TEXT_RECT, aWidget);
  textRect.InitForQueryTextRect(aOffset, 1);
  aWidget->DispatchEvent(&textRect, status);
  if (NS_WARN_IF(!textRect.mSucceeded)) {
    return false;
  }
  aCharRect = textRect.mReply.mRect;

  // Guarantee the rect is not empty.
  if (NS_WARN_IF(!aCharRect.height)) {
    aCharRect.height = 1;
  }
  if (NS_WARN_IF(!aCharRect.width)) {
    aCharRect.width = 1;
  }
  return true;
}

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;
}

bool
ContentCacheInParent::GetUnionTextRects(
                        uint32_t aOffset,
                        uint32_t aLength,
                        LayoutDeviceIntRect& aUnionTextRect) const
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("ContentCacheInParent: 0x%p GetUnionTextRects(aOffset=%u, "
     "aLength=%u), mTextRectArray={ mStart=%u, mRects.Length()=%u }, "
     "mSelection={ mAnchor=%u, mFocus=%u }",
     this, aOffset, aLength, mTextRectArray.mStart,
     mTextRectArray.mRects.Length(), mSelection.mAnchor, mSelection.mFocus));

  CheckedInt<uint32_t> endOffset =
    CheckedInt<uint32_t>(aOffset) + aLength;
  if (!endOffset.isValid()) {
    return false;
  }

  if (!mSelection.Collapsed() &&
      aOffset == mSelection.StartOffset() && aLength == mSelection.Length()) {
    NS_WARN_IF(mSelection.mRect.IsEmpty());
    aUnionTextRect = mSelection.mRect;
    return !aUnionTextRect.IsEmpty();
  }

  if (aLength == 1) {
    if (!aOffset) {
      NS_WARN_IF(mFirstCharRect.IsEmpty());
      aUnionTextRect = mFirstCharRect;
      return !aUnionTextRect.IsEmpty();
    }
    if (aOffset == mSelection.mAnchor) {
      NS_WARN_IF(mSelection.mAnchorCharRect.IsEmpty());
      aUnionTextRect = mSelection.mAnchorCharRect;
      return !aUnionTextRect.IsEmpty();
    }
    if (aOffset == mSelection.mFocus) {
      NS_WARN_IF(mSelection.mFocusCharRect.IsEmpty());
      aUnionTextRect = mSelection.mFocusCharRect;
      return !aUnionTextRect.IsEmpty();
    }
  }

  // Even if some text rects are not cached of the queried range,
  // we should return union rect when the first character's rect is cached
  // since the first character rect is important and the others are not so
  // in most cases.

  if (!aOffset && aOffset != mSelection.mAnchor &&
      aOffset != mSelection.mFocus && !mTextRectArray.InRange(aOffset)) {
    // The first character rect isn't cached.
    return false;
  }

  if (mTextRectArray.IsOverlappingWith(aOffset, aLength)) {
    aUnionTextRect =
      mTextRectArray.GetUnionRectAsFarAsPossible(aOffset, aLength);
  } else {
    aUnionTextRect.SetEmpty();
  }

  if (!aOffset) {
    aUnionTextRect = aUnionTextRect.Union(mFirstCharRect);
  }
  if (aOffset <= mSelection.mAnchor && mSelection.mAnchor < endOffset.value()) {
    aUnionTextRect = aUnionTextRect.Union(mSelection.mAnchorCharRect);
  }
  if (aOffset <= mSelection.mFocus && mSelection.mFocus < endOffset.value()) {
    aUnionTextRect = aUnionTextRect.Union(mSelection.mFocusCharRect);
  }
  return !aUnionTextRect.IsEmpty();
}