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prerequisite for #375: M1347759

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This commit is contained in:
Cameron Kaiser 2017-05-06 14:14:33 -07:00
parent b1831fc750
commit 8e58b5c8fb
1 changed files with 33 additions and 17 deletions
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50
layout/generic/nsAbsoluteContainingBlock.cpp
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@ -262,22 +262,6 @@ nsAbsoluteContainingBlock::FrameDependsOnContainer(nsIFrame* f,
!IsFixedMarginSize(margin->mMargin.GetIEnd(wm))) {
return true;
}
if (!wm.IsBidiLTR()) {
// Note that even if 'istart' is a length, our position can
// still depend on the containing block isze, because if
// 'iend' is also a length we will discard 'istart' and be
// positioned relative to the containing block iend edge.
// 'istart' length and 'iend' auto is the only combination
// we can be sure of.
if (!IsFixedOffset(pos->mOffset.GetIStart(wm)) ||
pos->mOffset.GetIEndUnit(wm) != eStyleUnit_Auto) {
return true;
}
} else {
if (!IsFixedOffset(pos->mOffset.GetIStart(wm))) {
return true;
}
}
}
if (wm.IsVertical() ? aCBWidthChanged : aCBHeightChanged) {
// See if f's block-size might have changed.
@ -302,10 +286,42 @@ nsAbsoluteContainingBlock::FrameDependsOnContainer(nsIFrame* f,
!IsFixedMarginSize(margin->mMargin.GetBEnd(wm))) {
return true;
}
if (!IsFixedOffset(pos->mOffset.GetBStart(wm))) {
}
// Since we store coordinates relative to top and left, the position
// of a frame depends on that of its container if it is fixed relative
// to the right or bottom, or if it is positioned using percentages
// relative to the left or top. Because of the dependency on the
// sides (left and top) that we use to store coordinates, these tests
// are easier to do using physical coordinates rather than logical.
if (aCBWidthChanged) {
if (!IsFixedOffset(pos->mOffset.GetLeft())) {
return true;
}
// Note that even if 'left' is a length, our position can still
// depend on the containing block width, because if our direction or
// writing-mode moves from right to left (in either block or inline
// progression) and 'right' is not 'auto', we will discard 'left'
// and be positioned relative to the containing block right edge.
// 'left' length and 'right' auto is the only combination we can be
// sure of.
if ((wm.GetInlineDir() == WritingMode::eInlineRTL ||
wm.GetBlockDir() == WritingMode::eBlockRL) &&
pos->mOffset.GetRightUnit() != eStyleUnit_Auto) {
return true;
}
}
if (aCBHeightChanged) {
if (!IsFixedOffset(pos->mOffset.GetTop())) {
return true;
}
// See comment above for width changes.
if (wm.GetInlineDir() == WritingMode::eInlineBTT &&
pos->mOffset.GetBottomUnit() != eStyleUnit_Auto) {
return true;
}
}
return false;
}